JP2016224309A - Toner, developer, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner that prevents filming, and has excellent low-temperature fixability, high-temperature offset resistance, high glossiness, high color reproducibility, excellent charging property, and heat-resistant storage property.SOLUTION: A toner contains at least a polyester resin, and the polyester resin has a structure represented by any one of the following structural formulas (1) to (3). (1) R1-(NHCONH-R2-X-R3)n-, (2) R1-(NHCOO-R2-X-R3)n-, and (3) R1-(OCONH-R2-X-R3)n-, wherein: n=3; R1 represents an aromatic or aliphatic organic group; R2 represents a group derived from a resin of any one of polyester formed of at least one of a polycarboxylic acid and polyol and modified polyester in which polyester is modified with isocyanate; X represents a urea bond or a urethane bond; and R3 represents a group derived from a compound represented by a specific structural formula.SELECTED DRAWING: None

Description

  The present invention relates to a toner, a developer, and an image forming apparatus.

  In recent years, toners have been able to withstand high temperature and high humidity during storage and transportation after production, as well as reduction in particle size for high quality output images, high temperature offset resistance, low temperature fixability for energy saving. High heat-resistant storage stability is required. In particular, since power consumption during fixing accounts for much of the power consumption in the image forming process, it is very important to improve low-temperature fixability.

  Conventionally, toner prepared by a kneading and pulverizing method has been used. The toner produced by the kneading and pulverization method is difficult to reduce the particle size, the shape is irregular and the particle size distribution is broad, so the quality of the output image is not sufficient, and the fixing energy is high. There were problems such as. In addition, when a wax (release agent) is added to improve the fixability, the toner produced by the kneading and pulverization method cracks at the interface of the wax during pulverization, so that a large amount of wax exists on the toner surface. Resulting in. For this reason, there is a problem in that, while the releasing effect is produced, the toner (filming) easily adheres to the carrier, the photoreceptor and the blade, and the overall performance is not satisfactory.

Therefore, in order to overcome the above-mentioned problems caused by the kneading and pulverizing method, a toner manufacturing method by a polymerization method has been proposed. The toner produced by the polymerization method can be easily reduced in particle size, the particle size distribution is sharper than that of the toner produced by the pulverization method, and the release agent can be included. . As a method for producing a toner by a polymerization method, for the purpose of improving low-temperature fixability and improving high-temperature offset resistance, a method of producing a toner from an extension reaction product of urethane-modified polyester as a toner binder is disclosed. (For example, refer to Patent Document 1).
Also disclosed is a method for producing a toner that is excellent in powder flowability and transferability in the case of a small particle size toner, and also excellent in all of heat-resistant storage stability, low-temperature fixability, and high-temperature offset resistance (for example, Patent Documents 2 and 3).
Further, a method for producing a toner having an aging step for producing a toner binder having a stable molecular weight distribution and achieving both low-temperature fixability and high-temperature offset resistance is disclosed (for example, see Patent Documents 4 and 5). .
However, these proposed techniques do not satisfy the high level of low-temperature fixability required in recent years.

Therefore, for the purpose of obtaining a high level of low temperature fixability, a toner containing a crystalline polyester resin and a release agent, and a resin and a wax that are incompatible with each other and having a sea-island phase separation structure has been proposed. (For example, refer to Patent Document 6).
Further, a toner containing a crystalline polyester resin, a release agent, and a graft polymer has been proposed (see, for example, Patent Document 7).
For the purpose of obtaining a higher level of low-temperature fixability, a toner comprising an amorphous polyester obtained by reacting a reactive precursor having a branched structure with a very low glass transition temperature and a curing agent has been proposed. (See, for example, Patent Document 8).

The proposed techniques described in Patent Documents 6 and 7 can achieve low-temperature fixing because the crystalline polyester resin melts more rapidly than the amorphous polyester resin. However, even if the crystalline polyester resin corresponding to the island in the sea-island-like phase separation structure is melted, the amorphous polyester resin corresponding to most of the sea is not yet melted. Then, since both the crystalline polyester resin and the amorphous polyester resin are not fixed unless they are melted to some extent, these proposed techniques do not satisfy the high level of low-temperature fixability that has been increasing in recent years.
The proposed technique described in Patent Document 8 utilizes the property that a polyester resin having a very low glass transition temperature is deformed at a low temperature, and is deformed by heating and pressurization at the time of fixing. Such a property that it is easy to adhere to a recording medium. In addition, since the reactive precursor is non-linear, it has a branched structure in the molecular skeleton, and the molecular chain has a three-dimensional network structure, so it deforms at low temperatures but does not flow. Has properties. Therefore, it is possible to maintain the heat resistant storage stability and high temperature offset resistance of the toner.
However, according to this technique, a three-dimensional network structure is obtained by an ester reaction of diol, dicarboxylic acid, polyhydric alcohol, or acid, and there is a heterogeneous polyhydric alcohol or acid that becomes a branched structure. Therefore, there are a portion having a loose network structure and a dense portion. The loose portion causes deterioration in heat-resistant storage stability, and the dense portion causes a decrease in low-temperature fixability, image gloss, image density, and color reproducibility.
In addition, the portion forming the branch is an ester structure, and the cohesive force is weak as a cross-linking point of the resin. Therefore, it is difficult to maintain the heat-resistant storage unless it has a dense network structure. Low temperature fixability and image gloss cannot be obtained. It does not satisfy the high level of low-temperature fixability and image quality that have been increasing in recent years.
Accordingly, the present situation is that a toner having no filming and having excellent low-temperature fixability, high-temperature offset resistance, high gloss, high color reproducibility, excellent charging characteristics and heat-resistant storage stability is required.

  Accordingly, an object of the present invention is to provide a toner having no filming and having excellent low-temperature fixability, high-temperature offset resistance, high gloss, high color reproducibility, excellent charging characteristics and heat-resistant storage stability.

Means for solving the problems are as follows. That is,
The toner of the present invention is a toner containing at least a polyester resin, wherein the polyester resin has a structure represented by any one of the following structural formulas 1) to 3).
1) R1- (NHCONH-R2-X-R3) n-
2) R1- (NHCOO-R2-X-R3) n-
3) R1- (OCONH-R2-X-R3) n-
(Where n = 3
R1: aromatic or aliphatic organic group,
R2: a group derived from a resin comprising at least one of a polycarboxylic acid and a polyol, and a modified polyester obtained by modifying the polyester with an isocyanate;
X: Urea bond or urethane bond,
R3: represents a group derived from a compound represented by the following general formula (I).
[In the above general formula (I), T ₁ , T ₂ , T ₃ , T ₄ and T ₅ each represent either a hydrogen atom or an isocyanate group, at least one of which is an isocyanate group, U ₁ , U ₂ , U ₃ , U ₄ , and U ₅ each represent either a hydrogen atom or an isocyanate group, and at least one is an isocyanate group. ])

  According to the present invention, it is possible to provide a toner having excellent low-temperature fixability, high-temperature offset resistance, high gloss, high color reproducibility, excellent charging characteristics and heat-resistant storage stability.

FIG. 1 is a schematic configuration diagram showing an example of an image forming apparatus of the present invention. FIG. 2 is a schematic configuration diagram showing another example of the image forming apparatus of the present invention. FIG. 3 is an image diagram for explaining a branched structure of a conventional polyester resin. FIG. 4 is an image diagram for explaining a branched structure of a polyester resin defined in the present invention.

(toner)
The toner of the present invention contains at least a polyester resin, preferably further contains a crystalline polyester resin, and further contains other components such as a colorant, if necessary.
The polyester resin has a structure represented by any one of structural formulas 1) to 3) below.
1) R1- (NHCONH-R2-X-R3) n-
2) R1- (NHCOO-R2-X-R3) n-
3) R1- (OCONH-R2-X-R3) n-
(Where n = 3
R1: aromatic or aliphatic organic group,
R2: a group derived from a resin comprising at least one of a polycarboxylic acid and a polyol, and a modified polyester obtained by modifying the polyester with an isocyanate;
X: Urea bond or urethane bond,
R3: represents a group derived from a compound represented by the following general formula (I).
[In the above general formula (I), T ₁ , T ₂ , T ₃ , T ₄ and T ₅ each represent either a hydrogen atom or an isocyanate group, at least one of which is an isocyanate group, U ₁ , U ₂ , U ₃ , U ₄ , and U ₅ each represent either a hydrogen atom or an isocyanate group, and at least one is an isocyanate group. ])
That is, the polyester resin has a structure in which R2 which is a polyester or modified polyester portion and R1 corresponding to a branched structure are bonded by a urethane or urea group, and further has a structure in which R2 and R3 are bonded.

In order to improve the low-temperature fixability, a method of lowering the glass transition temperature or a method of reducing the molecular weight is conceivable so that a polyester resin (for example, an amorphous polyester resin) is melted together with the crystalline polyester resin. However, when the melt viscosity is lowered by simply lowering the glass transition temperature or decreasing the molecular weight of the polyester resin, it is easily imagined that the heat-resistant storage stability of the toner and the high-temperature offset property during fixing deteriorate. The
On the other hand, in the toner of the present invention, the polyester resin has a branched structure in the molecular skeleton due to urethane or urea bond, and the molecular chain has a three-dimensional network structure, and thus deforms at low temperature. It has a rubbery property of not flowing. Therefore, even when the glass transition temperature of the polyester resin is very low, it is possible to maintain the heat resistant storage stability and high temperature offset resistance of the toner.
In addition, if the network structure is not uniform, the heat-resistant storage stability is deteriorated because the flow control of the resin is insufficient in the part where the network is rough, and the resin deformability is insufficient in the part where the network is dense. Therefore, low temperature fixability and image gloss are reduced.
For example, in the polyester resin described in Japanese Patent No. 5408210 (corresponding to Patent Document 8) described in the above background art, the portion forming a branch has an ester structure (that is, the above-mentioned in the present application) In the structural formula represented by any one of 1) to 3), when R2 has a branched structure), the branched structure is non-uniformly present as shown in the image diagram of FIG. The glossiness is not fully satisfactory. FIG. 3 is a schematic view of a branched structure of a polyester resin obtained by a conventional synthesis method.
As described above, the conventional polyester resin has good low-temperature fixability and image glossiness, and on the other hand, the heat resistant storage stability and the high-temperature offset resistance are good. It is not easy.

However, the polyester resin of the present invention, for example, as an example of the production method, after synthesizing R2 which is a polyester or modified polyester part, can be bonded to R1 with a urethane or urea group to form a network structure. By narrowing the molecular weight distribution of the R2 portion, the network structure can be made uniform.
The state of the polyester resin having the structural formula represented by any one of 1) to 3) defined in the present invention is shown as an image diagram in FIG. FIG. 4 is a schematic view of the branched structure of the polyester resin obtained by the synthesis method described below. Since the length of the linear polyester resin portion of the R2 portion is uniform, the branched structure of the polyester resin is made uniform as shown in FIG.
Thus, by making the network structure of the polyester resin uniform, it becomes possible to achieve both heat-resistant storage stability, low-temperature fixability, image gloss, and high-temperature offset resistance of the toner.
Furthermore, the polyester resin has a urethane bond or urea bond with a high cohesive energy in the branched structure portion, and therefore exhibits a behavior like a strong cross-linking point, so even if it has a coarser network structure, the flow of the resin is suppressed. Therefore, the toner can be compatible with heat-resistant storage stability, low-temperature fixability, image gloss, and high-temperature offset resistance.

  Moreover, in the said polyester resin, the group derived from the compound represented by the said general formula (I) shown by said R3 has couple | bonded through R2 and X, and R3 part is contained. Thus, it is possible to provide a toner that has an appropriate and high charge level, has a small amount of change in the charge amount in the developing device, has a long life, and can realize low-temperature fixability and heat-resistant storage stability at a high level. .

<Polyester resin>
The polyester resin has a structure represented by any one of the above structural formulas 1) to 3), and R2 which is a polyester or modified polyester portion and R1 corresponding to a branched structure are bonded by a urethane or urea group. Furthermore, the R2 portion is also bonded to the R3 portion via X.
Since the polyester resin has at least one of a urethane bond and a urea bond in the branched structure portion, the urethane bond or the urea bond behaves like a pseudo-crosslinking point, and the rubber property of the polyester resin is strong. Thus, a toner excellent in heat-resistant storage stability and high-temperature offset resistance can be produced.
The polyester resin contains a diol component as a constituent component, and more preferably contains a dicarboxylic acid component as a constituent component.
The polyester resin is preferably an amorphous polyester resin.
The polyester resin is obtained by bonding R2 corresponding to a polyester resin or a modified polyester resin portion and R1 corresponding to a branched structure portion with a urethane or urea group, and represented by R2 and the general formula (I). As long as R3, which is a group derived from the compound to be bonded, is bonded with a urethane or urea group, there is no particular limitation, and it can be appropriately selected according to the purpose.

<< R1 part, R2 part >>
The bonding method of R1 and R2 is not limited to the following, but there are, for example, the following three methods.

a) A method in which a diol component and a dicarboxylic acid component are ester-reacted to produce a polyester polyol (R2) having a hydroxyl group at the terminal, and the obtained polyester polyol is reacted with a trivalent or higher polyisocyanate (R1).
b) Ester reaction of a diol component and a dicarboxylic acid component to produce a polyester polyol (R2) having a terminal hydroxyl group, and reacting the resulting polyester polyol with a divalent polyisocyanate to produce an isocyanate-modified polyester (R2) The method of making and reacting the isocyanate-modified polyester obtained and trivalent or more alcohol (R1).
c) Ester reaction of a diol component and a dicarboxylic acid component to produce a polyester polyol (R2) having a hydroxyl group at the terminal, and reacting the obtained polyester polyol with a divalent polyisocyanate to produce an isocyanate-modified polyester (R2). A method of producing and reacting a polyisocyanate (R1) having a valence of 3 or more with the obtained isocyanate-modified polyester in the presence of pure water.
The hydroxyl group remaining in the polyol obtained by any one of the above a) to c) can be further reacted with a diisocyanate or higher polyisocyanate to obtain a polyester prepolymer, which can be used by reacting with a curing agent in the toner preparation process. .

In order to lower the Tg of the polyester resin and easily impart the property of deforming at low temperatures, the polyester resin contains a diol component as a constituent component, and the diol component is an aliphatic diol having 3 to 12 carbon atoms. Is preferable, and it is more preferable to contain an aliphatic diol having 4 to 12 carbon atoms.
In the polyester resin, the aliphatic diol having 3 to 12 carbon atoms is preferably contained in an amount of 50 mol% or more, more preferably 80 mol% or more, and further preferably 90 mol% or more.

Examples of the aliphatic diol having 3 to 12 carbon atoms include 1,3-propanediol, 1,4-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, and 3-methyl. Examples include -1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, and the like.
In particular, in the polyester resin, the diol component is an aliphatic diol having 4 to 12 carbon atoms, the number of carbon atoms in the main chain of the diol component is an odd number, and the diol component is an alkyl group. It is more preferable that the side chain has.
Examples of the aliphatic diol having 4 to 12 carbon atoms having an odd number of carbon atoms in the main chain and an alkyl group in the side chain include aliphatic diols represented by the following general formula (1).
_{^{HO- (CR 1 R 2) n}} -OH ··· formula (1)
However, in said general formula (1), R < ¹ > and R < ² > represent a hydrogen atom and a C1-C3 alkyl group each independently. n represents an odd number of 3 to 9. In n repeating units, R ¹ may be the same or different. In the n repeating units, R ² may be the same or different.
Moreover, in order to make Tg of the said polyester resin low and to give the property which deform | transforms at low temperature easily, the said polyester resin contains C3 or more and 12 or less aliphatic diol 50 mol% or more in all the alcohol components. It is preferable.

In order to lower the Tg of the polyester resin and to easily impart the property of deforming at low temperatures, the polyester resin contains a dicarboxylic acid component as a constituent component, and the dicarboxylic acid component is a fat having 4 to 12 carbon atoms. It is preferable to contain a group dicarboxylic acid.
The polyester resin preferably contains 30 mol% or more of the aliphatic dicarboxylic acid having 4 to 12 carbon atoms.
Examples of the aliphatic dicarboxylic acid having 4 to 12 carbon atoms include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dodecanedioic acid.

-Diol component-
There is no restriction | limiting in particular as said diol component, According to the objective, it can select suitably, For example, ethylene glycol, 1, 2- propylene glycol, 1, 3- propylene glycol, 1, 4- butanediol, 2- Methyl-1,3-propanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1, Aliphatic diols such as 12-dodecanediol; Diols having an oxyalkylene group such as diethylene glycol, triethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol; 1,4-cyclohexanedimethanol, hydrogenated bisphenol A etc. Alicyclic diols; alicyclic diols with addition of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide; bisphenols such as bisphenol A, bisphenol F, bisphenol S; bisphenols, ethylene oxide, propylene oxide, butylene Examples thereof include alkylene oxide adducts of bisphenols such as those obtained by adding alkylene oxides such as oxides. Among these, an aliphatic diol having 4 to 12 carbon atoms is preferable.
These diols may be used alone or in combination of two or more.

-Dicarboxylic acid component-
There is no restriction | limiting in particular as said dicarboxylic acid component, According to the objective, it can select suitably, For example, aliphatic dicarboxylic acid, aromatic dicarboxylic acid, etc. are mentioned. Moreover, these anhydrides may be used, a lower (C1-C3) alkyl esterified material may be used, and a halide may be used.
The aliphatic dicarboxylic acid is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include succinic acid, adipic acid, sebacic acid, dodecanedioic acid, maleic acid, and fumaric acid.
There is no restriction | limiting in particular as said aromatic dicarboxylic acid, Although it can select suitably according to the objective, C8-C20 aromatic dicarboxylic acid is preferable.
There is no restriction | limiting in particular as said C8-C20 aromatic dicarboxylic acid, According to the objective, it can select suitably, For example, a phthalic acid, isophthalic acid, a terephthalic acid, naphthalene dicarboxylic acid etc. are mentioned.
Among these, C4-C12 aliphatic dicarboxylic acids are preferable.
These dicarboxylic acids may be used alone or in combination of two or more.

-3 or more alcohols
The trihydric or higher alcohol is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a trihydric or higher aliphatic alcohol, a trihydric or higher polyphenol, an alkylene of a trihydric or higher polyphenol. Examples include oxide adducts.
Examples of the trihydric or higher aliphatic alcohol include glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitol and the like.
Examples of the trihydric or higher polyphenols include trisphenol PA, phenol novolak, cresol novolak, and the like.
Examples of the alkylene oxide adducts of trihydric or higher polyphenols include those obtained by adding alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide to trihydric or higher polyphenols.

-Polyisocyanate-
There is no restriction | limiting in particular as said polyisocyanate, According to the objective, it can select suitably, For example, diisocyanate, trivalent or more isocyanate etc. are mentioned.
Examples of the diisocyanate include aliphatic diisocyanates, alicyclic diisocyanates, aromatic diisocyanates, araliphatic diisocyanates, isocyanurates, and those blocked with phenol derivatives, oximes, caprolactams, and the like.
Examples of the tri- or higher valent isocyanate include lysine triisocyanate, or those obtained by reacting a tri- or higher alcohol with diisocyanate.
The aliphatic diisocyanate is not particularly limited and may be appropriately selected depending on the intended purpose. For example, tetramethylene diisocyanate, hexamethylene diisocyanate, methyl 2,6-diisocyanatocaproate, octamethylene diisocyanate, decamethylene Examples thereof include diisocyanate, dodecamethylene diisocyanate, tetradecamethylene diisocyanate, trimethylhexane diisocyanate, and tetramethylhexane diisocyanate.
The alicyclic diisocyanate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include isophorone diisocyanate and cyclohexylmethane diisocyanate.
The aromatic diisocyanate is not particularly limited and may be appropriately selected depending on the intended purpose. For example, tolylene diisocyanate, 1,5-naphthylene diisocyanate, 4,4′-diisocyanatodiphenyl, 4,4 Examples include '-diisocyanato-3,3'-dimethyldiphenyl, 4,4'-diisocyanato-3-methyldiphenylmethane, and 4,4'-diisocyanato-diphenyl ether.
The araliphatic diisocyanate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include α, α, α ′, α′-tetramethylxylylene diisocyanate.
There is no restriction | limiting in particular as said isocyanurates, According to the objective, it can select suitably, For example, a tris (isocyanatoalkyl) isocyanurate, a tris (isocyanatocycloalkyl) isocyanurate, etc. are mentioned.
These polyisocyanates may be used alone or in combination of two or more.

-Curing agent-
As the curing agent, a curing agent capable of generating the polyester resin by reacting with a polyester prepolymer (reaction product of the polyester resin portion of R2 and the polyisocyanate, that is, a reaction precursor that reacts with the curing agent). If it is, there will be no restriction | limiting in particular, According to the objective, it can select suitably, For example, an active hydrogen group containing compound etc. are mentioned.
-Active hydrogen group-containing compound-
There is no restriction | limiting in particular as an active hydrogen group in the said active hydrogen group containing compound, According to the objective, it can select suitably, For example, a hydroxyl group (alcoholic hydroxyl group and phenolic hydroxyl group), an amino group, a carboxyl group, a mercapto group Etc. These may be used individually by 1 type and may use 2 or more types together.
There is no restriction | limiting in particular as said active hydrogen group containing compound, Although it can select suitably according to the objective, Amines are preferable at the point which can form a urea bond.
The amines are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include diamines, trivalent or higher valent amines, amino alcohols, amino mercaptans, amino acids, and those obtained by blocking these amino groups. Can be mentioned. These may be used individually by 1 type and may use 2 or more types together.
Among these, diamine and a mixture of a diamine and a small amount of a trivalent or higher amine are preferable.
There is no restriction | limiting in particular as said diamine, According to the objective, it can select suitably, For example, aromatic diamine, alicyclic diamine, aliphatic diamine etc. are mentioned. There is no restriction | limiting in particular as said aromatic diamine, According to the objective, it can select suitably, For example, phenylenediamine, diethyltoluenediamine, 4,4'- diaminodiphenylmethane etc. are mentioned. The alicyclic diamine is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 4,4′-diamino-3,3′-dimethyldicyclohexylmethane, diaminocyclohexane and isophorone diamine. It is done. There is no restriction | limiting in particular as said aliphatic diamine, According to the objective, it can select suitably, For example, ethylenediamine, tetramethylenediamine, hexamethylenediamine etc. are mentioned.
The trivalent or higher amine is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include diethylenetriamine and triethylenetetramine.
The amino alcohol is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ethanolamine and hydroxyethylaniline.
The amino mercaptan is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include aminoethyl mercaptan and aminopropyl mercaptan.
The amino acid is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include aminopropionic acid and aminocaproic acid.
There is no restriction | limiting in particular as what blocked the said amino group, According to the objective, it can select suitably, For example, it is obtained by blocking an amino group with ketones, such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. Examples include ketimine compounds and oxazoline compounds.

<< R3 part >>
As a method of bonding R2 and R3, for example, a diol component and a dicarboxylic acid component are ester-reacted to produce a polyester polyol (R2) having a terminal hydroxyl group, and the resulting polyester polyol is represented by the general formula ( The method of making it react with the isocyanate compound represented by I) is mentioned. In addition, the diol component and dicarboxylic acid component here are as having described by the item of said << R1 part, R2 part >>.
As the isocyanate compound represented by the general formula (I), diphenylmethane diisocyanate (MDI) is preferable. Is mentioned. Examples of specific examples of the isocyanate compound represented by the general formula (I) are shown in (I-1) to (I-3) below, but are not limited thereto.
These compounds may be used individually by 1 type, and may use 2 or more types together.

In the bonding method of R1 and R2 described in the above item << R1 part, R2 part >> for bonding R2 and R3, the divalent polyisocyanate is represented by the general formula (I). An isocyanate compound may be used. Accordingly, the structural formulas 1) to 3) in which R1, R2, and R3 are bonded to each other by the method described in the method for bonding R1 and R2 described in the above item << R1 portion, R2 portion >>. A polyester resin having a structure can be obtained.
Depending on the bonding method, in the structural formulas 1) to 3),
More specifically, the moiety represented by "-R2-X-R3"
It includes an embodiment represented by "-R3-Y-R2'-X-R3" (wherein R2 'is a polyester and Y represents a urea bond or a urethane bond). That is, depending on the bonding method, as represented by the above “-R3-Y-R2 ′”, the modified polyester of R2 may contain an R3 moiety. In that case, in the structural formulas represented by the structural formulas 1) to 3), a group derived from the compound represented by the general formula (I) represented by R3 is bonded to R1 and R2. In addition to being bonded to the opposite R2 side, R3 is also bonded between R1 and R2.

The glass transition temperature of the polyester resin is preferably -60 ° C or higher and 0 ° C or lower, and more preferably -40 ° C or higher and -20 ° C or lower.
When the glass transition temperature is −60 ° C. or higher, it is possible to prevent problems such as deterioration of heat-resistant storage stability and deterioration of filming resistance without suppressing the flow of toner at a low temperature.
When the glass transition temperature is 0 ° C. or lower, it is possible to prevent the problem that the toner due to heating and pressurization at the time of fixing cannot be sufficiently deformed and the low-temperature fixability is insufficient.

In the polyester resin, in the structural formulas 1) to 3), it is preferable that the organic group represented by R1 is composed of an organic group having a short carbon number from the viewpoint that the network structure is easily uniformized, and has 20 carbon atoms. The following aliphatic and aromatic organic groups are preferred.
Moreover, the organic group of R1 may contain an ester bond.
Among them, the organic group of R1 is an aliphatic compound or an aliphatic compound containing an ester bond because the cohesive strength of the crosslinking points can be adjusted to an appropriate range and both high gloss and heat resistant storage stability can be easily achieved. Is preferred.

There is no restriction | limiting in particular as a weight average molecular weight (Mw) of the said polyester resin, Although it can select suitably according to the objective, In GPC (gel permeation chromatography) measurement, 30,000 or more and 60,000 or less are preferable. .
The weight average molecular weight of the polyester resin refers to the molecular weight of a reaction product obtained by reacting the reactive precursor and the curing agent.
When the weight average molecular weight is 30,000 or more, it is possible to prevent the toner from easily flowing at a low temperature and inferior in heat resistant storage stability.
Moreover, the viscosity at the time of a melt | dissolution becomes low and the problem that high temperature offset property falls can also be prevented.
The weight average molecular weight / number average molecular weight (Mw / Mn) is preferably 6-12.
The polyester resin preferably has a high molecular weight substance that is insoluble in tetrahydrofuran (THF).

  As said polyester resin as used in the field of this invention, what is necessary is just to contain the polyester resin which has the structure represented by either of said structural formula 1) -3), and in any of said structural formula 1) -3) The polyester resin having the structure represented may be used alone, or other than the polyester resin having the structure represented by any one of the structural formulas 1) to 3) (also referred to as the first polyester resin). In addition, other polyester resins (also referred to as second polyester resins) may be used in combination.

<< Other polyester resins >>
The other polyester resin (second polyester resin) includes, for example, a diol component and a dicarboxylic acid component as constituent components.
The other polyester resin refers to a type of polyester resin different from the polyester resin having the structural formula of any one of 1) to 3).
The other polyester resin is preferably an amorphous polyester resin.
The other polyester resin is preferably a linear polyester resin.
Furthermore, the other polyester resin is preferably an unmodified polyester resin.
Here, the unmodified polyester resin is a polyester resin obtained by using a polyhydric alcohol and a polyvalent carboxylic acid such as a polyvalent carboxylic acid, a polyvalent carboxylic acid anhydride, or a polyvalent carboxylic acid ester or a derivative thereof. A polyester resin that is not modified with an isocyanate compound or the like.

Examples of the polyhydric alcohol include diols.
Examples of the diol include polyoxypropylene (2.2) -2,2-bis (4-hydroxyphenyl) propane and polyoxyethylene (2.2) -2,2-bis (4-hydroxyphenyl) propane. Bisphenol A alkylene (2 to 3 carbon atoms) oxide (average addition mole number 1 to 10) adduct; ethylene glycol, propylene glycol; hydrogenated bisphenol A, hydrogenated bisphenol A alkylene (2 to 3 carbon atoms) Examples include oxide (average added mole number 1 to 10) adducts.
These may be used individually by 1 type and may use 2 or more types together.
Examples of the polyvalent carboxylic acid include dicarboxylic acid.
Examples of the dicarboxylic acid include adipic acid, phthalic acid, isophthalic acid, terephthalic acid, fumaric acid, maleic acid; alkyl groups having 1 to 20 carbon atoms such as dodecenyl succinic acid and octyl succinic acid; And succinic acid substituted with a group.
These may be used individually by 1 type and may use 2 or more types together.
For the purpose of adjusting the acid value and the hydroxyl value, the other polyester resin may contain at least one of a trivalent or higher carboxylic acid and a trivalent or higher alcohol at the end of the resin chain.
Examples of the trivalent or higher carboxylic acid include trimellitic acid, pyromellitic acid, or acid anhydrides thereof.
Examples of the trivalent or higher alcohol include glycerin, pentaerythritol, and trimethylolpropane.

The molecular weight of the other polyester resin is not particularly limited and may be appropriately selected according to the purpose. However, when the molecular weight is too low, the heat resistant storage stability of the toner and the durability against stress such as stirring in the developing machine. In the case of GPC (gel permeation chromatography) measurement, the weight average molecular weight (Mw) 3 may be inferior. , Preferably 10,000 to 10,000.
The number average molecular weight (Mn) is preferably 1,000 to 4,000.
Moreover, it is preferable that Mw / Mn is 1.0-4.0.
The weight average molecular weight (Mw) is more preferably 4,000 to 7,000.
The number average molecular weight (Mn) is more preferably 1,500 to 3,000.
The Mw / Mn is more preferably 1.0 to 3.5.
There is no restriction | limiting in particular as an acid value of said other polyester resin, Although it can select suitably according to the objective, 1 mgKOH / g-50 mgKOH / g are preferable, and 5 mgKOH / g-30 mgKOH / g are more preferable.
When the acid value is 1 mgKOH / g or more, the toner is likely to be negatively charged, and further, the affinity between the paper and the toner is improved at the time of fixing to paper, and the low-temperature fixability can be improved. .
When the acid value is 50 mgKOH / g or less, it is possible to prevent deterioration of charging stability, particularly charging stability against environmental fluctuation.
There is no restriction | limiting in particular as a hydroxyl value of the said other polyester resin, Although it can select suitably according to the objective, It is preferable that it is 5 mgKOH / g or more.
The glass transition temperature (Tg) of the other polyester resin is preferably 40 ° C. or higher and 70 ° C. or lower, and more preferably 50 ° C. or higher and 60 ° C. or lower.
When the glass transition temperature is 40 ° C. or higher, the heat-resistant storage stability of the toner and the durability against stress such as stirring in the developing machine are inferior, and the problems that the filming resistance deteriorates can be prevented. .
When the glass transition temperature is 70 ° C. or lower, it is possible to prevent a problem that the deformation due to heating and pressurization at the time of fixing the toner is not sufficient and the low-temperature fixability becomes insufficient.

The molecular structure of the polyester resin (including any case where the polyester resin having the structure represented by any one of the above structural formulas 1) to 3) is used alone or in combination with other polyester resins is In addition to NMR measurement by solid, it can be confirmed by X-ray diffraction, GC / MS, LC / MS, IR measurement and the like. For example, in the infrared absorption spectrum, there may be mentioned a method in which 965 ± 10 cm ⁻¹ and 990 ± 10 cm ⁻¹ have no absorption based on δCH (out-of-plane variable angular vibration) of the olefin as the polyester resin.

As the content of the polyester resin (including any case where the polyester resin having a structure represented by any one of the above structural formulas 1 to 3) is used alone and in combination with other polyester resins) Although there is no restriction | limiting, Although it can select suitably according to the objective, For example, the said polyester resin is the polyester resin which has a structure represented by either of the said structural formulas 1) -3), and other polyester resins. 2 to 5 parts by mass of the polyester resin having the structure represented by any one of the above structural formulas 1) to 3)) with respect to 100 parts by mass of the toner. Preferably, 10 parts by mass to 20 parts by mass is more preferable. When the content is 5 parts by mass or more, the problem that the low temperature fixability and the high temperature offset resistance are deteriorated can be prevented, and when the content is 25 parts by mass or less, the heat resistant storage stability is deteriorated, and after fixing. It is possible to prevent the problem that the glossiness of the obtained image is lowered. When the content is within the more preferable range, it is advantageous in that it is excellent in all of low-temperature fixability, high-temperature offset resistance, and heat-resistant storage stability.
On the other hand, the other polyester resin is preferably contained in an amount of 50 to 90 parts by mass, more preferably 60 to 80 parts by mass with respect to 100 parts by mass of the toner. When the content is 50 parts by mass or more, the dispersibility of the pigment and the release agent in the toner is deteriorated, and it is possible to prevent the problem that the image is likely to be fogged or disturbed. If it exists, the fall of the low temperature fixability by the content of the polyester resin which has the structure represented by either the crystalline polyester resin mentioned later or the said Structural formula 1) -3)) can be prevented. When the content is in the more preferable range, it is advantageous in that it is excellent in all of high image quality and low temperature fixability.

<Crystalline polyester resin>
Since the crystalline polyester resin has high crystallinity, it exhibits a heat-melting characteristic that exhibits a sudden viscosity drop near the fixing start temperature. By using the crystalline polyester resin having such characteristics together with the polyester resin, the heat-resistant storage stability due to the crystallinity is good until just before the melting start temperature, and the viscosity rapidly decreases due to melting of the crystalline polyester resin at the melting start temperature. (Sharp melt) is caused, and it is compatible with the polyester resin, and the viscosity is rapidly lowered to fix the toner. Thus, a toner having both good heat-resistant storage stability and low-temperature fixability can be obtained. Also, good results are shown for the release width (difference between the fixing lower limit temperature and the high temperature resistant offset occurrence temperature).
The crystalline polyester resin is obtained using a polyhydric alcohol and a polyvalent carboxylic acid such as a polyvalent carboxylic acid, a polyvalent carboxylic acid anhydride, or a polyvalent carboxylic acid ester, or a derivative thereof.
In the present invention, as described above, the crystalline polyester resin uses a polyhydric alcohol and a polyvalent carboxylic acid such as a polyvalent carboxylic acid, a polyvalent carboxylic acid anhydride, a polyvalent carboxylic acid ester, or a derivative thereof. A polyester resin modified, for example, the prepolymer and a resin obtained by crosslinking and / or elongation reaction of the prepolymer do not belong to the crystalline polyester resin.
The presence or absence of crystallinity of the crystalline polyester resin in the present invention can be confirmed by a crystal analysis X-ray diffractometer (for example, X'Pert Pro MRD Phillips). The measurement method is described below.
First, a target sample is ground with a mortar to prepare a sample powder, and the obtained sample powder is uniformly applied to a sample holder. Thereafter, a sample holder is set in the diffractometer and measurement is performed to obtain a diffraction spectrum.
Among the peaks obtained in the range of 20 ° <2θ <25 ° in the obtained diffraction peak, it is judged that the peak having the highest peak intensity has a crystallinity when the peak half width is 2.0 or less.
In the present invention, a polyester resin that does not exhibit the above state relative to a crystalline polyester resin is referred to as an amorphous polyester resin.
The measurement conditions for X-ray diffraction are described below.
〔Measurement condition〕
Tention kV: 45kV
Current: 40mA
MPSS
Upper
Gonio
Scannode: continuuos
Start angle: 3 °
End angle: 35 °
Angle Step: 0.02 °
Lucent beam optics
Divergence slit: Div slit 1/2
Difference beam optics
Anti scatter slit: As Fixed 1/2
Receiving slit: Prog rec slit

-Polyhydric alcohol-
There is no restriction | limiting in particular as said polyhydric alcohol, According to the objective, it can select suitably, For example, diol and trihydric or more alcohol are mentioned.
Examples of the diol include saturated aliphatic diol. Examples of the saturated aliphatic diol include linear saturated aliphatic diols and branched saturated aliphatic diols. Among these, linear saturated aliphatic diols are preferable, and linear saturated fats having 2 to 12 carbon atoms are preferred. Group diols are more preferred. When the saturated aliphatic diol is branched, the crystallinity of the crystalline polyester resin is lowered and the melting point may be lowered. Therefore, a linear saturated aliphatic diol is preferable. Further, when the saturated aliphatic diol has 12 or less carbon atoms, it is practically easy to obtain the material. The number of carbon atoms is more preferably 12 or less.
Examples of the saturated aliphatic diol include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1, 8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1, Examples thereof include 18-octadecanediol and 1,14-eicosandecanediol. Among these, ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10 are preferred because the crystalline polyester resin has high crystallinity and excellent sharp melt properties. -Decanediol and 1,12-dodecanediol are preferred.
Examples of the trihydric or higher alcohol include glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol. These may be used individually by 1 type and may use 2 or more types together.

-Multivalent carboxylic acid-
There is no restriction | limiting in particular as said polyvalent carboxylic acid, According to the objective, it can select suitably, For example, bivalent carboxylic acid and trivalent or more carboxylic acid are mentioned.
Examples of the divalent carboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, peric acid, azelaic acid, sebacic acid, 1,9-nonanedicarboxylic acid, 1,10-decanedicarboxylic acid, 1, Saturated aliphatic dicarboxylic acids such as 12-dodecanedicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid; phthalic acid, isophthalic acid, terephthalic acid, naphthalene-2,6-dicarboxylic acid, malonic acid, Aromatic dicarboxylic acids such as dibasic acids such as mesaconic acid; and the like, and anhydrides and lower (C1 to C3) alkyl esters thereof.
Examples of the trivalent or higher carboxylic acid include 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, and the like, and anhydrides thereof. Lower (carbon number 1 to 3) alkyl ester and the like.
In addition to the saturated aliphatic dicarboxylic acid and aromatic dicarboxylic acid, the polyvalent carboxylic acid may include a dicarboxylic acid having a sulfonic acid group. Furthermore, in addition to the saturated aliphatic dicarboxylic acid and aromatic dicarboxylic acid, a dicarboxylic acid having a double bond may be contained. These may be used individually by 1 type and may use 2 or more types together.

The crystalline polyester resin is preferably composed of a linear saturated aliphatic dicarboxylic acid having 4 to 12 carbon atoms and a linear saturated aliphatic diol having 2 to 12 carbon atoms. That is, the crystalline polyester resin preferably has a structural unit derived from a saturated aliphatic dicarboxylic acid having 4 to 12 carbon atoms and a structural unit derived from a saturated aliphatic diol having 2 to 12 carbon atoms. . By doing so, since crystallinity is high and it is excellent in sharp melt property, it is preferable at the point which can exhibit the outstanding low-temperature fixability.
There is no restriction | limiting in particular as melting | fusing point of the said crystalline polyester resin, Although it can select suitably according to the objective, It is preferable that it is 60 to 80 degreeC. When the melting point is 60 ° C. or higher, the problem that the crystalline polyester resin is easily melted at a low temperature and the heat resistant storage stability of the toner is reduced can be prevented. It is possible to prevent the problem that the crystalline polyester resin is not sufficiently melted and the low-temperature fixability is lowered.
The molecular weight of the crystalline polyester resin is not particularly limited and may be appropriately selected depending on the intended purpose. However, those having a sharp molecular weight distribution and a low molecular weight are excellent in low-temperature fixability, and many components have a low molecular weight. From the viewpoint that heat-resistant storage stability is lowered, the soluble content of orthodichlorobenzene of the crystalline polyester resin is determined by GPC measurement in terms of weight average molecular weight (Mw) 3,000 to 30,000, number average molecular weight (Mn). It is preferably 1,000 to 10,000 and Mw / Mn 1.0 to 10. Furthermore, it is preferable that they are weight average molecular weight (Mw) 5,000-15,000, number average molecular weight (Mn) 2,000-10,000, and Mw / Mn 1.0-5.0.
The acid value of the crystalline polyester resin is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of the affinity between paper and resin, in order to achieve desired low-temperature fixability, 5 mgKOH / g or more is preferable and 10 mgKOH / g or more is more preferable. On the other hand, in order to improve the high temperature offset resistance, 45 mgKOH / g or less is preferable.
The hydroxyl value of the crystalline polyester resin is not particularly limited and may be appropriately selected according to the purpose. However, in order to achieve a desired temperature fixability and good charging characteristics, 0 mgKOH / G to 50 mgKOH / g are preferable, and 5 mgKOH / g to 50 mgKOH / g are more preferable.

The molecular structure of the crystalline polyester resin can be confirmed by X-ray diffraction, GC / MS, LC / MS, IR measurement, etc. in addition to NMR measurement by solution or solid. As a simple example, there is a method of detecting, as a crystalline polyester resin, an infrared absorption spectrum having an absorption based on δCH (out-of-plane variable vibration) of olefin at 965 ± 10 cm ⁻¹ or 990 ± 10 cm ⁻¹ .
There is no restriction | limiting in particular as content of the said crystalline polyester resin, Although it can select suitably according to the objective, 3 mass parts-20 mass parts are preferable with respect to 100 mass parts of the said toner, and 5 mass parts. -15 mass parts is more preferable. When the content is 3 parts by mass or more, it is possible to prevent the problem of poor low-temperature fixability due to insufficient sharp melting with a crystalline polyester resin. Can be prevented, and the problem that image fogging easily occurs. When the content is within the more preferable range, it is advantageous in that it is excellent in all of high image quality and low temperature fixability.

<Other ingredients>
Examples of the other components include a release agent, a colorant, a charge control agent, an external additive, a fluidity improver, a cleaning property improver, and a magnetic material.

-Release agent-
There is no restriction | limiting in particular as said mold release agent, It can select suitably from well-known things.
Examples of mold release agents for waxes and waxes include plant waxes such as carnauba wax, cotton wax, and wood wax rice wax; animal waxes such as beeswax and lanolin; mineral waxes such as ozokerite and cercin; paraffin And natural waxes such as petroleum waxes such as microcrystalline and petrolatum.
In addition to these natural waxes, synthetic hydrocarbon waxes such as Fischer-Tropsch wax, polyethylene, and polypropylene; synthetic waxes such as esters, ketones, and ethers;
There is no restriction | limiting in particular as content of the said mold release agent, Although it can select suitably according to the objective, 2 mass parts-10 mass parts are preferable with respect to 100 mass parts of said toner, 3 mass parts- 8 parts by mass is more preferable.

-Colorant-
There is no restriction | limiting in particular as said colorant, According to the objective, it can select suitably, For example, a black pigment, a yellow pigment, a magenta pigment, a cyan pigment etc. are mentioned.
There is no restriction | limiting in particular as content of the said coloring agent, Although it can select suitably according to the objective, 1 mass part-15 mass parts are preferable with respect to 100 mass parts of said toners, and 3 mass parts-10 parts. Part by mass is more preferable.
The colorant can also be used as a master batch combined with a resin. As the resin to be kneaded together with the production of the master batch or the master batch, for example, in addition to the above other polyester resins, styrene such as polystyrene, poly p-chlorostyrene, polyvinyltoluene, etc. Can be selected as appropriate.

  The masterbatch can be obtained by mixing and kneading a masterbatch resin and a colorant under high shearing force. At this time, an organic solvent can be used in order to enhance the interaction between the colorant and the resin. In addition, a so-called flushing method, which is a wet method of colorant, is a method of mixing and kneading an aqueous paste containing water of a colorant together with a resin and an organic solvent, transferring the colorant to the resin side, and removing moisture and organic solvent components. Since the cake can be used as it is, it does not need to be dried and is preferably used.

-Charge control agent-
The charge control agent is not particularly limited and may be appropriately selected depending on the intended purpose.For example, nigrosine dyes, triphenylmethane dyes, chromium-containing metal complex dyes, molybdate chelate pigments, rhodamine dyes, Alkoxy amines, quaternary ammonium salts (including fluorine-modified quaternary ammonium salts), alkylamides, phosphorus simple substances or compounds, tungsten simple substances or compounds, fluorine activators, salicylic acid metal salts, metal salts of salicylic acid derivatives, etc. Is mentioned.
The content of the charge control agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.1 parts by mass to 10 parts by mass with respect to 100 parts by mass of the toner. 2 mass parts-5 mass parts are more preferable.

-External additive-
As the external additive, in addition to oxide fine particles, inorganic fine particles and hydrophobized inorganic particles can be used in combination, but the average particle size of the hydrophobized primary particles is preferably 1 nm to 100 nm, and 5 nm to 70 nm. The inorganic fine particles are more preferable.
The external additive is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include silica fine particles, hydrophobic silica, fatty acid metal salts (for example, zinc stearate and aluminum stearate), and metal oxides. (For example, titania, alumina, tin oxide, antimony oxide, etc.), fluoropolymer, and the like.
Suitable additives include hydrophobized silica, titania, titanium oxide, and alumina fine particles.
The content of the external additive is not particularly limited and may be appropriately selected depending on the intended purpose. 3 mass parts-3 mass parts are more preferable.

-Fluidity improver-
The fluidity improver is not particularly limited as long as it is surface-treated to increase hydrophobicity and prevent deterioration of flow characteristics and charging characteristics even under high humidity, and is appropriately selected according to the purpose. For example, silane coupling agents, silylating agents, silane coupling agents having an alkyl fluoride group, organic titanate coupling agents, aluminum coupling agents, silicone oils, modified silicone oils, etc. It is done. It is particularly preferable that the silica and the titanium oxide are surface-treated with such a fluidity improver and used as hydrophobic silica and hydrophobic titanium oxide.

-Cleaning improver-
The cleaning property improving agent is not particularly limited as long as it is added to the toner in order to remove the developer after transfer remaining on the photosensitive member or the primary transfer medium, and is appropriately selected according to the purpose. Examples thereof include fatty acid metal salts such as zinc stearate, calcium stearate and stearic acid, polymer fine particles produced by soap-free emulsion polymerization such as polymethyl methacrylate fine particles and polystyrene fine particles.

-Magnetic material-
There is no restriction | limiting in particular as said magnetic material, According to the objective, it can select suitably, For example, iron powder, magnetite, a ferrite, etc. are mentioned. Among these, white is preferable in terms of color tone.

<Glass transition temperature (Tg1st)>
The toner preferably has a glass transition temperature (Tg1st) of 20 ° C. or more and 50 ° C. or less at the first temperature increase in differential scanning calorimetry (DSC).
In the case of a conventional toner, when the Tg is about 50 ° C. or less, toner aggregation is likely to occur due to temperature changes in the summer environment and the tropical region during transportation of the toner and in a storage environment. As a result, solidification in the toner bottle and fixation of the toner in the developing machine occur. Also, replenishment failure due to toner clogging in the toner bottle and image abnormality due to toner fixation in the developing machine are likely to occur.
The toner of the present invention has a lower Tg than conventional toners. However, since the polyester resin having a structure represented by any one of the above structural formulas 1) to 3), which is a low Tg component in the toner, is non-linear, the toner of the present invention has heat resistant storage stability. Can be held. In particular, when the polyester resin having the structure represented by any one of the structural formulas 1) to 3) has a urethane bond or a urea bond having a high cohesive force, the effect of maintaining heat-resistant storage stability becomes more remarkable. .
When Tg1st is 20 ° C. or higher, problems such as deterioration in heat-resistant storage stability, blocking in the developing machine, and filming on the photoreceptor can be prevented. It is possible to prevent the problem that the low-temperature fixability is lowered.

As a preferred embodiment of the present invention, the polyester resin contains two types of the polyester resin having the structure represented by any one of the above 1) to 3) and the other polyester resin, and contains the polyester resin. The aspect whose Tg1st of this is 20 degreeC or more and 50 degrees C or less is mentioned.
The difference (Tg1st−Tg2nd) between the glass transition temperature (Tg1st) of the first temperature increase and the glass transition temperature (Tg2nd) of the second temperature increase in the differential scanning calorimetry (DSC) of the toner is not particularly limited. However, it is more preferably 10 ° C. or higher. The upper limit of the difference is not particularly limited and may be appropriately selected depending on the purpose. The difference (Tg1st−Tg2nd) is preferably 50 ° C. or less.
A preferred embodiment of the present invention includes an embodiment in which the polyester resin further contains a crystalline polyester resin, and the difference between Tg1st and Tg2nd (Tg1st−Tg2nd) of the toner containing these is 10 ° C. or more.
When the difference is 10 ° C. or more, it is advantageous in that the low-temperature fixability is excellent. The difference of 10 ° C. or more indicates that the crystalline polyester resin and the polyester resin, which existed in an incompatible state before heating (before the first temperature increase), are heated (temperature increase). This means that after the first time, a compatible state is reached.
In addition, the compatible state after a heating does not need to be a complete compatible state.
There is no restriction | limiting in particular as melting | fusing point of the said toner, Although it can select suitably according to the objective, 60 to 80 degreeC is preferable.

<Volume average particle diameter>
The volume average particle diameter of the toner is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3 μm or more and 7 μm or less. The ratio of the volume average particle diameter to the number average particle diameter is preferably 1.2 or less. Further, it is preferable to contain 1% by number or more and 10% by number or less of a component having a volume average particle diameter of 2 μm or less.

<Calculation method and analysis method of various characteristics of toner and toner component>
SP value, Tg, acid value, hydroxyl value, molecular weight, and melting point of the polyester resin, the crystalline polyester resin, and the release agent may be measured on their own, but gel penetration from an actual toner It is possible to calculate the SP value, Tg, molecular weight, melting point, and mass ratio of the constituent components by performing separation by chromatography (GPC) or the like, and taking the analysis method described later for the separated components.
Separation of each component by GPC can be performed, for example, by the following method.
In GPC measurement using THF (tetrahydrofuran) as a mobile phase, the eluate is fractionated by a fraction collector or the like, and fractions corresponding to a desired molecular weight portion of the entire surface of the elution curve are collected.
After concentrating and drying the collected eluate with an evaporator or the like, the solid content is dissolved in a heavy solvent such as deuterated chloroform or deuterated THF, and ¹ H-NMR measurement is performed. The constituent monomer ratio of is calculated.
As another method, after concentrating the eluate, it is hydrolyzed with sodium hydroxide or the like, and the decomposition product is subjected to qualitative quantitative analysis by high performance liquid chromatography (HPLC) to calculate the constituent monomer ratio.
In the case where the toner base particles are formed by forming the polyester resin by the elongation reaction and / or the cross-linking reaction between the nonlinear reactive precursor and the curing agent, The toner may be separated from the toner by GPC or the like to obtain Tg of the polyester resin, or separately, the polyester resin may be subjected to an extension reaction and / or a crosslinking reaction between the nonlinear reactive precursor and the curing agent. And Tg and the like may be measured from the synthesized polyester resin.

<< Toner component separation means >>
An example of the separation means for each component when analyzing the toner will be described in detail.
First, 1 g of toner is put into 100 mL of THF, and a solution in which the soluble components are dissolved is obtained while stirring for 30 minutes at 25 ° C.
This is filtered through a membrane filter having an opening of 0.2 μm to obtain a THF soluble component in the toner.
Subsequently, this is melt | dissolved in THF, it is set as the sample for GPC measurement, and it inject | pours into GPC used for the molecular weight measurement of each above-mentioned resin.
On the other hand, a fraction collector is placed at the eluate discharge port of GPC, and the eluate is collected every predetermined count, and the eluate is eluted every 5% in area ratio from the elution curve elution start (curve rise). Get.
Next, for each elution, 30 mg of sample is dissolved in 1 mL of deuterated chloroform, and 0.05% by volume of tetramethylsilane (TMS) is added as a reference substance.
The solution is filled in a 5 mm diameter glass tube for NMR measurement, and a spectrum is obtained by performing integration 128 times at a temperature of 23 ° C. to 25 ° C. using a nuclear magnetic resonance apparatus (JNM-AL400 manufactured by JEOL Ltd.). .
The monomer composition and the composition ratio of the polyester resin and the crystalline polyester resin contained in the toner can be obtained from the peak integration ratio of the obtained spectrum.
For example, peak assignment is performed as follows, and the component ratio of the constituent monomer is determined from each integral ratio.
The attribution of the peak is, for example,
Near 8.25 ppm: derived from benzene ring of trimellitic acid (for one hydrogen)
8.07 ppm to around 8.10 ppm: derived from benzene ring of terephthalic acid (for 4 hydrogens)
7.1 ppm to 7.25 ppm vicinity: derived from benzene ring of bisphenol A (for 4 hydrogens)
Around 6.8 ppm: derived from benzene ring of bisphenol A (for 4 hydrogens) and from double bond of fumaric acid (for 2 hydrogens)
5.2 ppm to around 5.4 ppm: methine derived from bisphenol A propylene oxide adduct (one hydrogen)
3.7 ppm to around 4.7 ppm: bisphenol A propylene oxide adduct derived from methylene (for 2 hydrogens) and bisphenol A ethylene oxide adduct derived from methylene (for 4 hydrogens)
Around 1.6 ppm: derived from methyl group of bisphenol A (for 6 hydrogens)
It can be.
From these results, for example, the extract recovered in the fraction in which the polyester resin having the structure represented by any one of the structural formulas 1) to 3) occupies 90% or more is represented by the structural formulas 1) to 3). It can be handled as a polyester resin having a structure represented by either.
Similarly, the extract recovered in the fraction in which the other polyester resin occupies 90% or more can be treated as the other polyester resin.
Moreover, the extract recovered in the fraction in which the crystalline polyester resin occupies 90% or more can be handled as the crystalline polyester resin.

<< Method for measuring hydroxyl value and acid value >>
The hydroxyl value can be measured using a method based on JIS K0070-1966.
Specifically, first, 0.5 g of a sample is precisely weighed into a 100 mL volumetric flask, and 5 mL of an acetylating reagent is added thereto. Next, after heating in a 100 ± 5 ° C. warm bath for 1 to 2 hours, the flask is removed from the warm bath and allowed to cool. Furthermore, water is added and shaken to decompose acetic anhydride.
Next, in order to completely decompose acetic anhydride, the flask is again heated in a warm bath for 10 minutes or more and allowed to cool, and then the wall of the flask is thoroughly washed with an organic solvent. Furthermore, the hydroxyl value was measured at 23 ° C. using an automatic potentiometric titrator DL-53 Titrator (manufactured by METTLER TOLEDO) and electrode DG113-SC (manufactured by METTLER TOLEDO), and analysis software LabX Light Version 1.00 Analyze using .000. For calibration of the apparatus, a mixed solvent of 120 mL of toluene and 30 mL of ethanol is used.
At this time, the measurement conditions are as follows.
〔Measurement condition〕
Still
Speed [%] 25
Time [s] 15
EQP titration
Titrant / Sensor
Titrant CH ₃ ONa
Concentration [mol / L] 0.1
Sensor DG115
Unit of measurement mV
Predispensing to volume
Volume [mL] 1.0
Wait time [s] 0
Titrant addition Dynamic
dE (set) [mV] 8.0
dV (min) [mL] 0.03
dV (max) [mL] 0.5
Measurement mode Equilibrium controlled
dE [mV] 0.5
dt [s] 1.0
t (min) [s] 2.0
t (max) [s] 20.0
Recognition
Threshold 100.0
Steppes jump only No
Range No
Tendency None
Termination
at maximum volume [mL] 10.0
at potential No
at slope No
after number EQPs Yes
n = 1
comb. termination conditions No
Evaluation
Procedure Standard
Potential1 No
Potentialial No
Stop for revaluation No
The acid value can be measured using a method based on JIS K0070-1992.
Specifically, first, 0.5 g of a sample (0.3 g in the case where ethyl acetate is soluble) is added to 120 mL of toluene and dissolved by stirring at 23 ° C. for about 10 hours. Next, 30 mL of ethanol is added to prepare a sample solution. When the sample does not dissolve, a solvent such as dioxane or tetrahydrofuran is used.
Furthermore, an acid value was measured at 23 ° C. using an automatic potentiometric titrator DL-53 Titator (manufactured by METTLER TOLEDO) and electrode DG113-SC (manufactured by METTLER TOLEDO), and analysis software LabX Light Version 1.00 Analyze using .000.
For calibration of the apparatus, a mixed solvent of 120 mL of toluene and 30 mL of ethanol is used.
At this time, the measurement conditions are the same as in the case of the hydroxyl value described above.
The acid value can be measured as described above. Specifically, titration is performed with a 0.1N potassium hydroxide / alcohol solution standardized in advance, and the acid value [mg KOH / g] = The acid value is calculated by titration [mL] × N × 56.1 [mg / mL] / sample [g] (where N is a factor of 0.1 N potassium hydroxide / alcohol solution).

<< Measurement Method of Melting Point and Glass Transition Temperature (Tg) >>
The melting point and glass transition temperature (Tg) in the present invention can be measured using, for example, a DSC system (differential scanning calorimeter) (“Q-200”, manufactured by TA Instruments).
Specifically, the melting point and glass transition temperature of the target sample can be measured by the following procedure.
First, about 5.0 mg of a target sample is placed in an aluminum sample container, and the sample container is placed on a holder unit and set in an electric furnace. Next, heating is performed from −80 ° C. to 150 ° C. at a temperature rising rate of 10 ° C./min in a nitrogen atmosphere (first temperature increase). Thereafter, the temperature is decreased from 150 ° C. to −80 ° C. at a temperature decrease rate of 10 ° C./min, and further heated to 150 ° C. at a temperature increase rate of 10 ° C./min (second temperature increase). In each of the first temperature increase and the second temperature increase, the DSC curve is measured using a differential scanning calorimeter (“Q-200”, manufactured by TA Instruments).
From the obtained DSC curve, the DSC curve at the first temperature rise can be selected using the analysis program in the Q-200 system, and the glass transition temperature at the first temperature rise of the target sample can be obtained. Similarly, the DSC curve at the second temperature increase can be selected, and the glass transition temperature at the second temperature increase of the target sample can be obtained.
Further, from the obtained DSC curve, using the analysis program in the Q-200 system, the DSC curve at the first temperature rise is selected, and the endothermic peak top temperature at the first temperature rise of the target sample is obtained as the melting point. Can do. Similarly, a DSC curve at the second temperature increase can be selected, and the endothermic peak top temperature at the second temperature increase of the target sample can be obtained as the melting point.
In this specification, when the toner is used as the target sample, the glass transition temperature at the first temperature rise is Tg1st, and the glass transition temperature at the second temperature rise is Tg2nd.
In addition, in the present specification, unless otherwise specified, the endothermic heat at the second temperature rise is the glass transition temperature and the melting point of the polyester resin, the crystalline polyester resin, and the other components such as the release agent. Let the peak top temperature and Tg be the melting point and Tg of each target sample.

<< Measurement Method of Particle Size Distribution >>
For the volume average particle diameter (D4) and number average particle diameter (Dn) of the toner, the ratio (D4 / Dn) is, for example, Coulter Counter TA-II, Coulter Multisizer II (both manufactured by Coulter Co., Ltd.) or the like. Can be measured.
In the present invention, Coulter Multisizer II is used.
The measurement method is described below.
First, 0.1 mL to 5 mL of a surfactant (preferably polyoxyethylene alkyl ether (nonionic surfactant)) as a dispersant is added to 100 mL to 150 mL of the electrolytic aqueous solution. Here, the electrolytic aqueous solution is a 1 mass% NaCl aqueous solution prepared using primary sodium chloride, and for example, ISOTON-II (manufactured by Coulter) can be used. Here, 2 mg to 20 mg of a measurement sample is further added.
The electrolytic aqueous solution in which the sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 to 3 minutes, and the measurement device is used to measure the volume and number of toner particles or toner using a 100 μm aperture as the aperture. Calculate volume distribution and number distribution.
From the obtained distribution, the volume average particle diameter (D4) and the number average particle diameter (Dn) of the toner can be obtained.
As a channel, it is 2.00 micrometers or more and less than 2.52 micrometers; 2.52 micrometers or more and less than 3.17 micrometers; 3.17 micrometers or more and less than 4.00 micrometers; 4.00 micrometers or more and less than 5.04 micrometers; 5.04 micrometers or more and less than 6.35 micrometers; .35 μm or more and less than 8.00 μm; 8.00 μm or more and less than 10.08 μm; 10.08 μm or more and less than 12.70 μm; 12.70 μm or more and less than 16.00 μm; 16.00 μm or more and less than 20.20 μm; Less than 40 μm; 25.40 μm or more and less than 32.00 μm; 3 channels of 32.00 μm or more and less than 40.30 μm are used, and particles having a particle size of 2.00 μm or more and less than 40.30 μm are targeted.

<< Measurement of molecular weight >>
The molecular weight of each component of the toner can be measured, for example, by the following method.
Gel permeation chromatography (GPC) measuring device: GPC-8220GPC (manufactured by Tosoh Corporation)
Column: TSKgel SuperHZM-H 15 cm triple (manufactured by Tosoh Corporation)
Temperature: 40 ° C
Solvent: tetrahydrofuran (THF)
Flow rate: 0.35 mL / min
Sample: 0.4 mL injection of 0.15% by mass sample Pretreatment of sample: Toner was dissolved in tetrahydrofuran THF (manufactured by Wako Pure Chemical Industries, Ltd.) at 0.15% by mass and filtered through a 0.2 μm filter. The filtrate is used as a sample.
100 μL of the THF sample solution is injected and measured.
In measuring the molecular weight of a sample, the molecular weight distribution of the sample is calculated from the relationship between the logarithmic value of a calibration curve prepared from several types of monodisperse polystyrene standard samples and the number of counts.
As a standard polystyrene sample for preparing a calibration curve, Showd STANDARD Std. No S-7300, S-210, S-390, S-875, S-1980, S-10.9, S-629, S-3.0, S-0.580 are used.
An RI (refractive index) detector is used as the detector.

<Toner production method>
The toner production method is not particularly limited and may be appropriately selected depending on the intended purpose. However, the toner contains the polyester resin, preferably further contains the crystalline polyester resin, and further if necessary. It is preferable to granulate by dispersing an oil phase containing the release agent, the colorant and the like in an aqueous medium. In particular, it is more preferable that the polyester resin contains two types of polyester resins, that is, a polyester resin having a structure represented by any one of the above structural formulas 1) to 3) and the other polyester resin.
Further, the toner may be represented by the polyester prepolymer (the reaction product of the R2 polyester resin portion and the polyisocyanate, the R2 polyester resin portion and the general formula (I)) as the polyester resin. A polyester resin that is a reaction product with an isocyanate compound, that is, a reaction precursor to be reacted with a curing agent, and the other polyester resin having no urethane bond and urea bond, preferably the crystalline polyester It is more preferable that the composition is granulated by dispersing an oil phase containing a resin and further containing the curing agent, the mold release agent, the colorant and the like in an aqueous medium as necessary.

  In the present invention, it is preferable to pay attention to the following conditions when producing a prepolymer comprising a reaction product of the resin part of the polyester of R2 and the isocyanate compound represented by the general formula (I). . When diphenylmethane diisocyanate (MDI) is used as the isocyanate compound represented by the general formula (I), when the intermediate polyester containing R2 is reacted with the diphenylmethane diisocyanate (MDI) (isocyanate group / intermediate of MDI) The molar ratio of the hydroxyl group of the polyester is preferably 1.5 or more and less than 3.0.

  An example of such a method for producing the toner is a known dissolution suspension method. As an example of the method for producing the toner, a polyester resin having a structure represented by any one of the above structural formulas 1) to 3) is generated by an extension reaction and / or a crosslinking reaction between the polyester prepolymer and the curing agent. A method for forming toner base particles will be described below. In such a method, the aqueous medium is prepared, the oil phase containing the toner material is prepared, the toner material is emulsified or dispersed, and the organic solvent is removed.

-Preparation of aqueous medium (aqueous phase)-
The aqueous medium can be prepared, for example, by dispersing resin particles in an aqueous medium. The amount of the resin particles added to the aqueous medium is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 parts by mass to 10 parts by mass with respect to 100 parts by mass of the aqueous medium. .
There is no restriction | limiting in particular as said aqueous medium, According to the objective, it can select suitably, For example, water, the solvent miscible with water, these mixtures etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, water is preferable.
The solvent miscible with water is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include alcohols, dimethylformamide, tetrahydrofuran, cellosolves, and lower ketones. There is no restriction | limiting in particular as said alcohol, According to the objective, it can select suitably, For example, methanol, isopropanol, ethylene glycol etc. are mentioned. There is no restriction | limiting in particular as said lower ketone, According to the objective, it can select suitably, For example, acetone, methyl ethyl ketone, etc. are mentioned.

-Preparation of oil phase-
Preparation of the oil phase containing the toner material includes at least the polyester prepolymer, the other polyester resin, and the crystalline polyester resin, and if necessary, the curing agent, the release agent, The toner material containing a colorant can be dissolved or dispersed in an organic solvent.
There is no restriction | limiting in particular as said organic solvent, Although it can select suitably according to the objective, The organic solvent whose boiling point is less than 150 degreeC is preferable at the point which is easy to remove.
The organic solvent having a boiling point of less than 150 ° C. is not particularly limited and may be appropriately selected depending on the intended purpose. For example, toluene, xylene, benzene, carbon tetrachloride, methylene chloride, 1,2-dichloroethane, 1 1,2-trichloroethane, trichloroethylene, chloroform, monochlorobenzene, dichloroethylidene, methyl acetate, ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, and the like. These may be used individually by 1 type and may use 2 or more types together.
Among these, ethyl acetate, toluene, xylene, benzene, methylene chloride, 1,2-dichloroethane, chloroform, carbon tetrachloride and the like are preferable, and ethyl acetate is more preferable.

-Emulsification or dispersion-
The emulsification or dispersion of the toner material can be performed by dispersing the oil phase containing the toner material in the aqueous medium. When the toner material is emulsified or dispersed, the curing agent and the polyester prepolymer are subjected to an extension reaction and / or a cross-linking reaction, whereby the structure represented by any one of the above structural formulas 1) to 3). This produces a polyester resin having
The polyester resin having the structure represented by any one of the above structural formulas 1) to 3) can be produced, for example, by the following methods (1) to (3).
(1) An oil phase containing the polyester prepolymer and the curing agent is emulsified or dispersed in an aqueous medium, and the curing agent and the polyester prepolymer are subjected to an extension reaction and / or a crosslinking reaction in the aqueous medium. To produce a polyester resin having a structure represented by any one of the above structural formulas 1) to 3).
(2) The oil phase containing the polyester prepolymer is emulsified or dispersed in an aqueous medium to which the curing agent is added in advance, and the curing agent and the polyester prepolymer are subjected to an extension reaction and / or a crosslinking reaction in the aqueous medium. To produce a polyester resin having a structure represented by any one of the above structural formulas 1) to 3).
(3) After emulsifying or dispersing the oil phase containing the polyester prepolymer in an aqueous medium, the curing agent is added to the aqueous medium, and the curing agent and the polyester prepolymer are added from the particle interface in the aqueous medium. A polyester resin having a structure represented by any one of the above structural formulas 1) to 3).
When the curing agent and the polyester prepolymer are subjected to an extension reaction and / or a crosslinking reaction from the particle interface, the structure represented by any one of the above structural formulas 1) to 3) is preferentially formed on the surface of the toner to be produced. A polyester resin having a structure represented by any one of the above structural formulas 1) to 3) may be provided in the toner.

The reaction conditions (reaction time, reaction temperature) for producing the polyester resin having the structure represented by any one of the above structural formulas 1) to 3) are not particularly limited, and the curing agent and the polyester pre-polymer are not limited. It can select suitably according to the combination with a polymer.
There is no restriction | limiting in particular as said reaction time, Although it can select suitably according to the objective, 10 minutes-40 hours are preferable, and 2 hours-24 hours are more preferable.
There is no restriction | limiting in particular as said reaction temperature, Although it can select suitably according to the objective, 0 to 150 degreeC is preferable and 40 to 98 degreeC is more preferable.
A method for stably forming the dispersion containing the polyester prepolymer in the aqueous medium is not particularly limited and may be appropriately selected depending on the intended purpose. For example, in the aqueous medium phase, the toner material And a method of adding an oil phase prepared by dissolving or dispersing in a solvent and dispersing it by shearing force.
The disperser for the dispersion is not particularly limited and can be appropriately selected according to the purpose. For example, a low-speed shear disperser, a high-speed shear disperser, a friction disperser, and a high-pressure jet disperser. And an ultrasonic disperser.
Among these, a high-speed shearing disperser is preferable in that the particle diameter of the dispersion (oil droplets) can be controlled to 2 μm to 20 μm.
When the high-speed shearing disperser is used, conditions such as the number of rotations, the dispersion time, and the dispersion temperature can be appropriately selected according to the purpose.
There is no restriction | limiting in particular as said rotation speed, Although it can select suitably according to the objective, 1,000 rpm-30,000 rpm are preferable, and 5,000 rpm-20,000 rpm are more preferable.
There is no restriction | limiting in particular as said dispersion | distribution time, Although it can select suitably according to the objective, In the case of a batch system, 0.1 minute-5 minutes are preferable.
There is no restriction | limiting in particular as said dispersion | distribution temperature, Although it can select suitably according to the objective, 0 degreeC-150 degreeC is preferable under pressure, and 40 degreeC-98 degreeC is more preferable. In general, dispersion is easier when the dispersion temperature is higher.
The amount of the aqueous medium used when emulsifying or dispersing the toner material is not particularly limited and may be appropriately selected depending on the intended purpose. It is 50 to 2 parts by mass with respect to 100 parts by mass of the toner material. 1,000 parts by mass is preferable, and 100 parts by mass to 1,000 parts by mass is more preferable.
When the amount of the aqueous medium used is 50 parts by mass or more, it is possible to prevent a problem that the dispersion state of the toner material is deteriorated and toner base particles having a predetermined particle diameter cannot be obtained. The production cost can be suppressed when the content is less than or equal to mass parts.

When emulsifying or dispersing the oil phase containing the toner material, it is preferable to use a dispersant from the viewpoint of stabilizing the dispersion such as oil droplets to obtain a desired shape and sharpening the particle size distribution. .
There is no restriction | limiting in particular as said dispersing agent, According to the objective, it can select suitably, For example, surfactant, a slightly water-soluble inorganic compound dispersing agent, a polymeric protective colloid, etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, surfactants are preferable.
There is no restriction | limiting in particular as said surfactant, According to the objective, it can select suitably, For example, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant etc. are used. be able to.
There is no restriction | limiting in particular as said anionic surfactant, According to the objective, it can select suitably, For example, alkylbenzene sulfonate, (alpha) -olefin sulfonate, phosphate ester etc. are mentioned. Among these, those having a fluoroalkyl group are preferable.
A catalyst can be used for the elongation reaction and / or the cross-linking reaction when the polyester resin having the structure represented by any one of the above structural formulas 1) to 3) is produced.
The catalyst is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include dibutyltin laurate and dioctyltin laurate.

-Removal of organic solvent-
The method for removing the organic solvent from the dispersion such as the emulsified slurry is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the temperature of the entire reaction system is gradually raised, Examples include a method of evaporating the organic solvent, and a method of removing the organic solvent in the oil droplets by spraying the dispersion into a dry atmosphere.
When the organic solvent is removed, toner base particles are formed. The toner base particles can be washed, dried, etc., and further classified. The classification may be performed by removing fine particle portions in a liquid by a cyclone, a decanter, centrifugation, or the like, or may be performed after drying.
The obtained toner base particles may be mixed with particles such as the external additive and the charge control agent. At this time, by applying a mechanical impact force, it is possible to prevent the particles such as the external additive from detaching from the surface of the toner base particles.
The method for applying the mechanical impact force is not particularly limited and can be appropriately selected depending on the purpose. For example, a method for applying the impact force to the mixture using blades rotating at high speed, For example, a method may be used in which the mixture is charged and accelerated to cause the particles or particles to collide with an appropriate collision plate.
The apparatus used in the above method is not particularly limited and can be appropriately selected depending on the purpose. For example, an ang mill (manufactured by Hosokawa Micron), an I-type mill (manufactured by Nippon Pneumatic Co., Ltd.) and a pulverization air pressure are modified. And a hybridization system (manufactured by Nara Machinery Co., Ltd.), a kryptron system (manufactured by Kawasaki Heavy Industries, Ltd.), and an automatic mortar.

(Developer)
The developer of the present invention contains at least the toner and, if necessary, other components such as a carrier as appropriate.
For this reason, it is excellent in transferability, chargeability, etc., and a high quality image can be formed stably. The developer may be a one-component developer or a two-component developer. However, when used in a high-speed printer or the like that supports an increase in information processing speed in recent years, the lifetime is shortened. A two-component developer is preferred because it improves.
<Career>
There is no restriction | limiting in particular as said carrier, Although it can select suitably according to the objective, What has a core material and the resin layer which coat | covers a core material is preferable.

(Image forming apparatus and image forming method)
The image forming apparatus of the present invention includes at least an electrostatic latent image carrier, an electrostatic latent image forming unit, and a developing unit, and further includes other units as necessary.
The image forming method according to the present invention includes at least an electrostatic latent image forming step and a developing step, and further includes other steps as necessary.
The image forming method can be preferably performed by the image forming apparatus, the electrostatic latent image forming step can be preferably performed by the electrostatic latent image forming unit, and the developing step can be performed by the developing unit. The other steps can be preferably performed by the other means.

<Electrostatic latent image carrier>
The material, structure, and size of the electrostatic latent image carrier are not particularly limited and may be appropriately selected from known materials. Examples of the material include inorganic photoreceptors such as amorphous silicon and selenium. And organic photoreceptors such as polysilane and phthalopolymethine. Among these, amorphous silicon is preferable in terms of long life.

<Electrostatic latent image forming means>
The electrostatic latent image forming means is not particularly limited as long as it is a means for forming an electrostatic latent image on the electrostatic latent image carrier, and can be appropriately selected according to the purpose. Examples thereof include at least a charging member that charges the surface of the electrostatic latent image carrier and an exposure member that exposes the surface of the electrostatic latent image carrier imagewise.

<Developing means>
The developing unit is not particularly limited as long as it is a developing unit including toner that develops the electrostatic latent image formed on the electrostatic latent image carrier to form a visible image. Can be selected as appropriate.

<Other means>
Examples of the other means include a transfer means, a fixing means, a cleaning means, a static elimination means, a recycling means, and a control means.

Next, one mode for carrying out the method of forming an image by the image forming apparatus of the present invention will be described with reference to FIG. A color image forming apparatus 100A shown in FIG. 1 includes a photosensitive drum 10 as the electrostatic latent image carrier (hereinafter also referred to as “photosensitive member 10”), a charging roller 20 as the charging unit, and the An exposure apparatus 30 as an exposure means, a developing device 40 as the development means, an intermediate transfer member 50, a cleaning device 60 as the cleaning means having a cleaning blade, and a static elimination lamp 70 as the static elimination means. .
The intermediate transfer member 50 is an endless belt, and is designed to be movable in the direction of an arrow by three rollers 51 that are arranged inside and stretched. Part of the three rollers 51 also functions as a transfer bias roller that can apply a predetermined transfer bias (primary transfer bias) to the intermediate transfer member 50. A cleaning device 90 having a cleaning blade is disposed in the vicinity of the intermediate transfer member 50. Also, in the vicinity of the intermediate transfer member 50, there is a transfer roller 80 as the transfer means capable of applying a transfer bias for transferring (secondary transfer) a developed image (toner image) onto a transfer sheet 95 as a recording medium. The intermediate transfer member 50 is disposed opposite to the intermediate transfer member 50. Around the intermediate transfer member 50, a corona charger 58 for applying a charge to the toner image on the intermediate transfer member 50 is arranged between the photosensitive member 10 and the intermediate transfer member 50 in the rotation direction of the intermediate transfer member 50. It is disposed between the contact portion and the contact portion between the intermediate transfer member 50 and the transfer paper 95.
The developing device 40 includes a developing belt 41 as the developer carrying member, and a black developing unit 45K, a yellow developing unit 45Y, a magenta developing unit 45M, and a cyan developing unit 45C provided around the developing belt 41. . The black developing unit 45K includes a developer accommodating portion 42K, a developer supply roller 43K, and a developing roller 44K. The yellow developing unit 45Y includes a developer container 42Y, a developer supply roller 43Y, and a developing roller 44Y. The magenta developing unit 45M includes a developer container 42M, a developer supply roller 43M, and a developing roller 44M. The cyan developing unit 45C includes a developer container 42C, a developer supply roller 43C, and a developing roller 44C. Further, the developing belt 41 is an endless belt, is rotatably stretched around a plurality of belt rollers, and a part thereof is in contact with the electrostatic latent image carrier 10.
In the color image forming apparatus 100 shown in FIG. 1, for example, the charging roller 20 charges the photosensitive drum 10 uniformly. The exposure device 30 performs imagewise exposure on the photosensitive drum 10 to form an electrostatic latent image. The electrostatic latent image formed on the photosensitive drum 10 is developed by supplying toner from the developing device 40 to form a toner image. The toner image is transferred (primary transfer) onto the intermediate transfer member 50 by the voltage applied from the roller 51 and further transferred (secondary transfer) onto the transfer paper 95. As a result, a transfer image is formed on the transfer paper 95. The residual toner on the photoconductor 10 is removed by the cleaning device 60, and the charge on the photoconductor 10 is temporarily removed by the charge eliminating lamp 70.

FIG. 2 shows another example of the image forming apparatus of the present invention. The image forming apparatus shown in FIG. 2 includes a copying apparatus main body 150, a paper feed table 200, a scanner 300, and an automatic document feeder (ADF) 400.
The copying apparatus main body 150 is provided with an endless belt-like intermediate transfer member 50 at the center. The intermediate transfer member 50 is stretched around the support rollers 14, 15 and 16, and can be rotated clockwise in FIG. 2. An intermediate transfer member cleaning device 17 for removing residual toner on the intermediate transfer member 50 is disposed in the vicinity of the support roller 15. The intermediate transfer member 50 stretched between the support roller 14 and the support roller 15 is a tandem type in which four image forming units 18 of yellow, cyan, magenta, and black are arranged to face each other along the conveyance direction. A developing device 120 is disposed. In the vicinity of the tandem developing device 120, an exposure device 21 as the exposure member is disposed. A secondary transfer device 22 is disposed on the side of the intermediate transfer member 50 opposite to the side on which the tandem developing device 120 is disposed. In the secondary transfer device 22, a secondary transfer belt 24, which is an endless belt, is stretched around a pair of rollers 23, and the transfer paper conveyed on the secondary transfer belt 24 and the intermediate transfer body 50 are in contact with each other. Is possible. In the vicinity of the secondary transfer device 22, a fixing device 25 as the fixing means is arranged. The fixing device 25 includes a fixing belt 26 that is an endless belt, and a pressure roller 27 that is pressed against the fixing belt 26.
In the tandem image forming apparatus, a sheet reversing device 28 for reversing the transfer paper for image formation on both sides of the transfer paper is disposed in the vicinity of the secondary transfer device 22 and the fixing device 25. .

Next, formation of a full-color image (color copy) using the tandem developing device 120 will be described. That is, first, a document is set on the document table 130 of the automatic document feeder (ADF) 400, or the automatic document feeder 400 is opened and the document is set on the contact glass 32 of the scanner 300. 400 is closed.
When a start switch (not shown) is pressed, when the document is set on the automatic document feeder 400, the document is transported and moved onto the contact glass 32, and then the document is set on the contact glass 32. Immediately after that, the scanner 300 is driven. Then, the first traveling body 33 and the second traveling body 34 travel. At this time, light from the light source is irradiated by the first traveling body 33 and reflected light from the document surface is reflected by the mirror in the second traveling body 34 and is received by the reading sensor 36 through the imaging lens 35 to be color. An original (color image) is read and used as black, yellow, magenta, and cyan image information.
Each image information of black, yellow, magenta, and cyan is stored in each image forming unit 18 (black image forming unit, yellow image forming unit, magenta image forming unit, and cyan image) in the tandem developing device 120. Forming means). In each image forming unit, black, yellow, magenta, and cyan toner images are formed. In other words, each image forming means 18 (black image forming means, yellow image forming means, magenta image forming means, and cyan image forming means) in the tandem developing device 120 is an electrostatic latent image carrier 10 ( Electrostatic latent image carrier for black 10K, electrostatic latent image carrier for yellow 10Y, electrostatic latent image carrier for magenta 10M, electrostatic latent image carrier for cyan 10C), and electrostatic latent image carrier 10 is a charging device 160 that uniformly charges 10 and the electrostatic latent image carrier is exposed like an image corresponding to each color image based on each color image information. An exposure apparatus for forming an electrostatic latent image corresponding to each color image, and developing the electrostatic latent image with each color toner (black toner, yellow toner, magenta toner, and cyan toner). A developing device 61 which is the developing means for forming a toner image by, and a transfer charger 62 for transferring the toner image on the intermediate transfer member 50, a cleaning device 63, and a discharger 64. Each image forming unit 18 can form each monochrome image (black image, yellow image, magenta image, and cyan image) based on the image information of each color. The black image, the yellow image, the magenta image, and the cyan image formed in this way are respectively transferred to the black electrostatic latent image carrier 10K on the intermediate transfer member 50 that is rotationally moved by the support rollers 14, 15, and 16. Black image formed on top, yellow image formed on electrostatic latent image carrier 10Y for yellow, magenta image formed on electrostatic latent image carrier 10M for magenta, and electrostatic latent image carrier for cyan The cyan image formed on 10C is sequentially transferred (primary transfer). Then, the black image, the yellow image, the magenta image, and the cyan image are superimposed on the intermediate transfer member 50 to form a composite color image (color transfer image).
On the other hand, in the paper feed table 200, one of the paper feed rollers 142 is selectively rotated to feed out a sheet (recording paper) from one of the paper feed cassettes 144 provided in multiple stages in the paper bank 143. The sheets are separated one by one by the separation roller 145, sent to the paper feed path 146, transported by the transport roller 147, guided to the paper feed path 148 in the copier body 150, and abutted against the registration roller 49 to stop. It is done. Alternatively, the sheet feed roller 142 is rotated to feed out sheets (recording paper) on the manual feed tray 54, separated one by one by the separation roller 52, put into the manual feed path 53, and abutted against the registration roller 49 and stopped. . The registration roller 49 is generally used while being grounded, but may be used in a state where a bias is applied to remove paper dust from the sheet. Then, the registration roller 49 is rotated in synchronization with the synthesized color image (color transfer image) synthesized on the intermediate transfer member 50, and a sheet (recording paper) is interposed between the intermediate transfer member 50 and the secondary transfer device 22. Then, the composite color image (color transfer image) is transferred (secondary transfer) onto the sheet (recording paper) by the secondary transfer device 22. By doing so, a color image is transferred and formed on the sheet (recording paper). The residual toner on the intermediate transfer member 50 after image transfer is cleaned by the intermediate transfer member cleaning device 17.
The sheet (recording paper) on which the color image has been transferred is conveyed by the secondary transfer device 22 and sent to the fixing device 25, where the combined color image (color) is generated by heat and pressure. (Transfer image) is fixed on the sheet (recording paper). Thereafter, the sheet (recording paper) is switched by a switching claw 55 and discharged by a discharge roller 56 and is stacked on a discharge tray 57. Alternatively, the sheet is switched by the switching claw 55 and reversed by the sheet reversing device 28 and guided to the transfer position again. Is done.

Examples of the present invention will be described below, but the present invention is not limited to the following examples. “Part” represents “part by mass” unless otherwise specified. “%” Represents “% by mass” unless otherwise specified.
Each measured value in the following examples was measured by the method described in this specification. The Tg and molecular weight of the polyester resin having the structure represented by any one of the above structural formulas 1) to 3), the other polyester resin, and the crystalline polyester resin are measured from each resin obtained in the production examples. did.

(Production Example 1)
<Synthesis of ketimine>
170 parts of isophoronediamine and 75 parts of methyl ethyl ketone were charged into a reaction vessel equipped with a stirrer and a thermometer, and reacted at 50 ° C. for 5 hours to obtain [ketimine compound 1].
The amine value of [ketimine compound 1] was 418.

(Production Example A-1)
<Synthesis of polyester resin A-1>
-Synthesis of Prepolymer A-1-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .3, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid so that titanium tetraisopropoxide (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was carried out under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-1.
Tg of the obtained intermediate polyester A′-1 was −45 ° C., Mw 10,000, and Mw / Mn 2.3.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, the molar ratio of the intermediate polyester A′-1 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of the intermediate polyester) The solution was added at 0.2, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-1 solution.
Tg of the obtained intermediate polyester A-1 was −40 ° C., Mw12,000, Mw / Mn2.5.
Next, the molar ratio of the intermediate polyester A-1 solution and diphenylmethane diisocyanate (MDI) (MDI isocyanate group / intermediate polyester hydroxyl group) in a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube 1 5 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a prepolymer A-1 solution.
-Synthesis of polyester resin A-1-
The obtained prepolymer A-1 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amount of amine of [ketimine compound 1] relative to the amount of isocyanate in the prepolymer A-1 was An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less, to obtain amorphous polyester resin A-1.
The physical property values of the obtained polyester resin A-1 are shown in Table 1-1.

(Production Example A-2)
<Synthesis of polyester resin A-2>
-Synthesis of Prepolymer A-2-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .3, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid so that titanium tetraisopropoxide (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was carried out under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-2.
The resulting intermediate polyester A′-2 had Tg of −45 ° C., Mw 10,000, and Mw / Mn 2.3.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe, the molar ratio of the intermediate polyester A′-2 and diphenylmethane diisocyanate (MDI) (isocyanate group of MDI / hydroxyl group of the intermediate polyester) 1 5 and diluted with ethyl acetate to a 50% ethyl acetate solution, followed by reaction at 100 ° C. for 5 hours to obtain an intermediate polyester A-2 solution.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, a molar ratio of the intermediate polyester solution A-2 and trimethylolpropane (TMP) (isocyanate group / TMP of the intermediate polyester A-2) Of hydroxyl group) 5.0, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain Prepolymer A-2.
-Synthesis of polyester resin A-2-
The obtained prepolymer A-2 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was higher than the isocyanate amount in the prepolymer A-2. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-2.
The physical properties of the obtained polyester resin A-2 are shown in Table 1-1.

(Production Example A-3)
<Synthesis of polyester resin A-3>
-Synthesis of Prepolymer A-3-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .3, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid so that titanium tetraisopropoxide (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was carried out under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-3.
The resulting intermediate polyester A′-3 had Tg of −45 ° C., Mw 10,000, and Mw / Mn 2.3.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe, the molar ratio of intermediate polyester A′-3 and diphenylmethane diisocyanate (MDI) (isocyanate group of MDI / hydroxyl group of intermediate polyester) 1 5 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-3 solution.
The obtained intermediate polyester A-3 had Tg of -25 ° C, Mw 40,000, and Mw / Mn 8.0.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, the molar ratio of the intermediate polyester A-3 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the isocyanate group of the intermediate polyester) After adding 0.2 and diluting with ethyl acetate to a 50% ethyl acetate solution, after adding dropwise an amount of pure water of 0.5 in molar ratio to the amount of NCO present in the reaction system The mixture was reacted at 100 ° C. for 5 hours to obtain a prepolymer A-3 solution.
-Synthesis of polyester resin A-3-
The obtained prepolymer A-3 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was higher than the isocyanate amount in the prepolymer A-3. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-3.
The physical properties of the obtained polyester resin A-3 are shown in Table 1-1.

(Production Example A-4)
<Synthesis of polyester resin A-4>
-Synthesis of Prepolymer A-4-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .15, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid. (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-4.
The Tg of the obtained intermediate polyester A′-4 was −35 ° C., Mw 18,000, and Mw / Mn 2.0.
Next, in a reaction vessel equipped with a cooling tube, a stirrer, and a nitrogen introduction tube, the molar ratio of intermediate polyester A′-4 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of intermediate polyester) The solution was added at 0.2, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-4 solution.
Tg of the obtained intermediate polyester A-4 was -35 ° C, Mw20,000, Mw / Mn2.5.
Next, a molar ratio of the intermediate polyester A-4 solution and diphenylmethane diisocyanate (MDI) (isocyanate group of MDI / hydroxyl group of intermediate polyester) 1 in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe. 5 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a prepolymer A-4 solution.
-Synthesis of polyester resin A-4-
The obtained prepolymer A-4 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amount of amine of [ketimine compound 1] relative to the amount of isocyanate in the prepolymer A-4 was An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-4.
Table 1-1 shows the physical properties of the obtained polyester resin A-4.

(Production Example A-5)
<Synthesis of polyester resin A-5>
-Synthesis of Prepolymer A-5-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .15, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid. (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-5.
Tg of obtained intermediate polyester A′-5 was −35 ° C., Mw 18,000, and Mw / Mn 2.0.
Next, in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, the molar ratio of the intermediate polyester A′-5 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of the intermediate polyester) The solution was added at 0.2, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-5 solution.
The obtained intermediate polyester A-5 had Tg of -35 ° C, Mw20,000, Mw / Mn2.5.
Next, a molar ratio of the intermediate polyester A-5 solution and diphenylmethane diisocyanate (MDI) (isocyanate group of MDI / hydroxyl group of intermediate polyester) 1 in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe. 7 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a prepolymer A-5 solution.
-Synthesis of polyester resin A-5-
The obtained prepolymer A-5 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was larger than the isocyanate amount in the prepolymer A-5. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-5.
The physical property values of the obtained polyester resin A-5 are shown in Table 1-2.

(Production Example A-6)
<Synthesis of polyester resin A-6>
-Synthesis of Prepolymer A-6-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 .15, the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid. (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-6.
The resulting intermediate polyester A′-6 had Tg of −35 ° C., Mw 18,000, and Mw / Mn 2.0.
Next, in a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, the molar ratio of the intermediate polyester A′-6 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of the intermediate polyester) The solution was added at 0.3, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-6 solution.
The resulting intermediate polyester A-6 had Tg of -30 ° C, Mw 24,000, and Mw / Mn 2.5.
Next, the molar ratio of the intermediate polyester A-6 solution and diphenylmethane diisocyanate (MDI) (isocyanate group of MDI / hydroxyl group of intermediate polyester) 1 in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe. 5 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a prepolymer A-6 solution.
-Synthesis of polyester resin A-6-
The obtained prepolymer A-6 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] relative to the isocyanate amount in the prepolymer A-6. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-6.
The physical property values of the obtained polyester resin A-6 are shown in Table 1-2.

(Production Example A-7)
<Synthesis of polyester resin A-7>
-Synthesis of Prepolymer A-7-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe, and OH / COOH which is a molar ratio of hydroxyl group to carboxyl group is 1 , The composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 50 mol% of terephthalic acid and 50 mol% of adipic acid so that titanium tetraisopropoxide (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-7.
The obtained intermediate polyester A′-7 had Tg of −40 ° C., Mw 15,000, and Mw / Mn 2.0.
Next, in a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, the molar ratio of the intermediate polyester A′-7 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of the intermediate polyester) The solution was added at 0.2, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-7 solution.
Tg of the obtained intermediate polyester A-7 was -35 ° C, Mw20,000, Mw / Mn2.2.
Next, a molar ratio of the intermediate polyester A-7 solution and isophorone diisocyanate (IPDI) in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe (IPDI isocyanate group / intermediate polyester hydroxyl group) 1 5 and diluted with ethyl acetate to a 50% ethyl acetate solution, followed by reaction at 100 ° C. for 5 hours to obtain a prepolymer A-7 solution.
-Synthesis of polyester resin A-7-
The obtained prepolymer A-7 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was higher than the isocyanate amount in the prepolymer A-7. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-7.
Table 2 shows the physical properties of the obtained polyester resin A-7.

(Production Example A-8)
<Synthesis of polyester resin A-8>
-Synthesis of Prepolymer A-8-
In a reaction vessel equipped with a condenser, a stirrer, and a nitrogen introduction tube, 97 mol% of 3-methyl-1,5-pentanediol as an alcohol component, 3 mol% of trimethylolpropane (TMP), and adipine as an acid component The acid was 50 mol% and terephthalic acid 50 mol%, and was added together with titanium tetraisopropoxide (300 ppm to resin component) so that the molar ratio of hydroxyl group to carboxyl group was OH / COOH = 1.1. .
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A-8.
Tg of the obtained intermediate polyester A-8 was -39 ° C, Mw12,000, Mw / Mn2.5.
Next, a molar ratio of the intermediate polyester A-8 and isophorone diisocyanate (IPDI) in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe (isocyanate group of IPDI / hydroxyl group of intermediate polyester) 2. 1 and diluted with ethyl acetate to a 48% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a non-linear prepolymer A-8.
-Synthesis of polyester resin A-8-
The obtained prepolymer A-8 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was larger than the isocyanate amount in the prepolymer A-8. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less, to obtain amorphous polyester resin A-8.
Table 2 shows the physical properties of the obtained polyester resin A-8.

(Production Example A-9)
<Synthesis of polyester resin A-9>
-Synthesis of Prepolymer A-9-
3-Methyl-1,5-pentanediol, terephthalic acid, and adipic acid are mixed in a reaction vessel equipped with a cooling pipe, a stirrer, and a nitrogen introduction pipe. 2 and the composition of the diol component is 100 mol% of 3-methyl-1,5-pentanediol, and the composition of the dicarboxylic acid component is 90 mol% of terephthalic acid and 10 mol% of adipic acid, so that titanium tetraisopropoxide (1,000 ppm relative to the resin component).
Thereafter, the temperature was raised to 200 ° C. in about 4 hours, and then the temperature was raised to 230 ° C. over 2 hours until the effluent water disappeared.
Thereafter, the reaction was further performed under reduced pressure of 10 mmHg to 15 mmHg for 5 hours to obtain an intermediate polyester A′-9.
The resulting intermediate polyester A′-9 had Tg of −5 ° C., Mw 13,000, and Mw / Mn 2.2.
Next, in a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, the molar ratio of the intermediate polyester A′-9 and lysine triisocyanate (RTI) (the isocyanate group of RTI / the hydroxyl group of the intermediate polyester) The solution was added at 0.2, diluted with ethyl acetate to a 50% ethyl acetate solution, and reacted at 100 ° C. for 5 hours to obtain an intermediate polyester A-9 solution.
The resulting intermediate polyester A-9 had Tg of 0 ° C., Mw 19,000, and Mw / Mn 2.4.
Next, a molar ratio of the intermediate polyester A-9 solution and isophorone diisocyanate (IPDI) in a reaction vessel equipped with a cooling pipe, a stirrer and a nitrogen introduction pipe (IPDI isocyanate group / intermediate polyester hydroxyl group) 1 5 and diluted with ethyl acetate to a 50% ethyl acetate solution and reacted at 100 ° C. for 5 hours to obtain a prepolymer A-9 solution.
-Synthesis of polyester resin A-9-
The obtained prepolymer A-9 was stirred in a reaction vessel equipped with a heating device, a stirrer, and a nitrogen introduction tube, and the amine amount of [ketimine compound 1] was larger than the isocyanate amount in the prepolymer A-9. An equimolar amount of [ketimine compound 1] was dropped into the reaction vessel, and the prepolymer extension product was taken out after stirring at 45 ° C. for 10 hours.
The obtained prepolymer extension product was dried under reduced pressure at 50 ° C. until the amount of residual ethyl acetate was 100 ppm or less to obtain amorphous polyester resin A-9.
Table 2 shows the physical properties of the obtained polyester resin A-9.

(Production Example B-1)
<Synthesis of polyester resin B-1>
Bisphenol A ethylene oxide side 2 mol adduct, bisphenol A propylene oxide 3 mol adduct, isophthalic acid, and adipic acid are added to a four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple. A molar ratio (bisphenol A ethylene oxide side 2 mol adduct / bisphenol A propylene oxide 3 mol adduct) is 85/15, and terephthalic acid is A ethylene oxide side 2 mol adduct and bisphenol A propylene oxide 3 mol adduct And adipic acid in a molar ratio (terephthalic acid / adipic acid) of 80/20 and charged so that OH / COOH, which is the molar ratio of hydroxyl group to carboxyl group, is 1.2, titanium tetraisopropoxide ( With 500ppm of resin component) The reaction was carried out at 230 ° C. for 8 hours, and further after 4 hours of reaction at a reduced pressure of 10 mmHg to 15 mmHg. Reacting for a time, amorphous polyester resin B-1 was obtained.
The physical property values are shown in Tables 1-1, 1-2, and 2.

(Production Example C-1)
<Synthesis of Crystalline Polyester Resin C-1>
To a 5 L four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple, dodecanedioic acid and 1,6-hexanediol are mixed with OH / COOH, which is a molar ratio of hydroxyl group to carboxyl group. Is made to be 0.9, reacted with titanium tetraisopropoxide (500 ppm with respect to the resin component) at 180 ° C. for 10 hours, then heated to 200 ° C. and reacted for 3 hours, and further 8. Reaction was performed at a pressure of 3 kPa for 2 hours to obtain a crystalline polyester resin C-1.
The physical property values are shown in Tables 1-1, 1-2, and 2.

Example 1
<Preparation of master batch (MB)>
1,200 parts of water, carbon black (manufactured by Printex 35 Dexa) [DBP oil absorption = 42 mL / 100 mg, pH = 9.5] and 500 parts of polyester resin B-1 are added, and Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded at 150 ° C. for 30 minutes using two rolls, rolled and cooled, and pulverized with a pulverizer to obtain [Masterbatch 1].
<Preparation of WAX dispersion>
50 parts of paraffin wax (manufactured by Nippon Seiki Co., Ltd., HNP-9, hydrocarbon wax, melting point 75 ° C., SP value 8.8) as a mold release agent 1 in a container set with a stir bar and a thermometer, and acetic acid 450 parts of ethyl was charged, heated to 80 ° C. with stirring, held at 80 ° C. for 5 hours, cooled to 30 ° C. at 1 hour, and sent using a bead mill (Ultra Visco Mill, manufactured by IMEX). Dispersion was carried out under the conditions of a liquid speed of 1 kg / hr, a disk peripheral speed of 6 m / sec, 80% by volume of 0.5 mm diameter zirconia beads, and 3 passes to obtain [WAX Dispersion 1].
<Preparation of crystalline polyester resin dispersion>
A container equipped with a stir bar and a thermometer was charged with 50 parts of crystalline polyester resin C-1 and 450 parts of ethyl acetate, heated to 80 ° C. with stirring, held at 80 ° C. for 5 hours, and then for 1 hour. To 30 ° C., and using a bead mill (Ultra Visco Mill, manufactured by Imex Co., Ltd.), a liquid feeding speed of 1 kg / hr, a disk peripheral speed of 6 m / sec, and filling with 80% by volume of 0.5 mm diameter zirconia beads, 3 passes Under the conditions, dispersion was performed to obtain [Crystalline polyester resin dispersion 1].

<Preparation of oil phase>
[WAX dispersion 1] 500 parts, [Prepolymer A-1] 200 parts, [Crystalline polyester resin dispersion 1] 500 parts, [Polyester resin B-1] 750 parts, [Masterbatch 1] 100 parts, and As a curing agent, 2 parts of [ketimine compound 1] were put in a container and mixed for 60 minutes at 5,000 rpm with a TK homomixer (manufactured by Tokushu Kika) to obtain [oil phase 1].
<Synthesis of organic fine particle emulsion (fine particle dispersion)>
In a reaction vessel equipped with a stir bar and a thermometer, 683 parts of water, 11 parts of a sodium salt of ethylene oxide methacrylate adduct sulfate (Eleminol RS-30: Sanyo Chemical Industries, Ltd.), 138 parts of styrene, methacrylic acid When 138 parts and 1 part of ammonium persulfate were charged and stirred at 400 rpm for 15 minutes, a white emulsion was obtained. The system was heated to raise the system temperature to 75 ° C. and reacted for 5 hours. Further, 30 parts of a 1% ammonium persulfate aqueous solution was added, and the mixture was aged at 75 ° C. for 5 hours, and an aqueous dispersion of a vinyl resin (a copolymer of sodium salt of styrene-methacrylic acid-methacrylic acid ethylene oxide adduct sulfate) [fine particles Dispersion 1] was obtained.
The volume average particle size of the [fine particle dispersion 1] measured with LA-920 (manufactured by HORIBA) was 0.14 μm. A portion of [Fine Particle Dispersion 1] was dried to isolate the resin component.
<Preparation of aqueous phase>
990 parts of water, 83 parts of [fine particle dispersion], 37 parts of 48.5% aqueous solution of sodium dodecyl diphenyl ether disulfonate (Eleminol MON-7: manufactured by Sanyo Chemical Industries Ltd.) and 90 parts of ethyl acetate were mixed and stirred to give a milky white color Obtained liquid. This was designated as [Aqueous Phase 1].

<Emulsification / desolvation>
1,200 parts of [Aqueous phase 1] was added to a container containing [Oil phase 1], and mixed with a TK homomixer at 13,000 rpm for 20 minutes to obtain [Emulsified slurry 1].
[Emulsion slurry 1] was put into a container equipped with a stirrer and a thermometer, and after removing the solvent at 30 ° C. for 8 hours, aging was carried out at 45 ° C. for 4 hours to obtain [Dispersion slurry 1].
<Washing and drying>
[Dispersion Slurry 1] After filtering 100 parts under reduced pressure,
(1): 100 parts of ion-exchanged water was added to the filter cake, mixed with a TK homomixer (10 minutes at 12,000 rpm), and then filtered.
(2): 100 parts of a 10% aqueous sodium hydroxide solution was added to the filter cake of (1), mixed with a TK homomixer (30 minutes at 12,000 rpm), and then filtered under reduced pressure.
(3): 100 parts of 10% hydrochloric acid was added to the filter cake of (2), mixed with a TK homomixer (rotation speed: 12,000 rpm for 10 minutes), and then filtered.
(4): The operations of (1) to (4) above, wherein 300 parts of ion-exchanged water is added to the filter cake of (3), mixed with a TK homomixer (10 minutes at 12,000 rpm) and then filtered. Was performed twice to obtain a [filter cake].
[Filter cake] was dried with a circulating dryer at 45 ° C. for 48 hours, and sieved with a mesh having an opening of 75 μm to obtain [Mother toner particles 1].
Table 1-1 shows the composition ratio, Tg1st, and Tg2nd of the obtained [toner base particle 1].
<External processing>
To 100 parts by mass of toner base particles 1, 0.6 parts by mass of hydrophobic silica having an average particle size of 100 nm, 1.0 part by mass of titanium oxide having an average particle size of 20 nm, and hydrophobic silica fine powder having an average particle size of 15 nm Toner 1 was obtained by mixing 0.8 part of the body with a Henschel mixer.

<Creation of carrier>
To 100 parts by mass of toluene, 100 parts by mass of a silicone resin (organostraight silicone), 5 parts by mass of γ- (2-aminoethyl) aminopropyltrimethoxysilane, and 10 parts by mass of carbon black are added and dispersed for 20 minutes with a homomixer. To prepare a resin layer coating solution. Using a fluid bed type coating device, the resin layer coating solution was applied to the surface of 1,000 parts by mass of spherical magnetite having an average particle size of 50 μm to prepare a carrier.
<Production of developer>
Using a ball mill, 15 parts by mass of toner 15 and 95 parts by mass of carrier were mixed to prepare a developer. Next, various characteristics were evaluated using the produced developers as follows. The results are shown in Table 1-1.

<Chargeability>
In an environment of 23 ° C. and a humidity of 53 ± 3%, 0.35 g of toner base particles and 5 g of carrier are placed in a SUS cylindrical container (inner diameter 25 mm, height 30 mm), and the humidity is adjusted for 12 hours or more. Was sealed, and the container was rotated at 300 rpm for 5 minutes. The mixture of toner and carrier was sampled from the container, put in a 400 mesh blow-off gauge, air blown at an air pressure of 5 KPa for 3 minutes, and then measured using a Q / M meter (manufactured by EPPING) manufactured by Epping. As for the setting of the Q / M meter, the mesh size is 400 mesh (made of stainless steel), the soft blow pressure (1050 V) suction time is 90 seconds. The charge amount is calculated by the following formula.
Charge amount (μC / g) = Total amount of electricity after 90 seconds (μC) / Amount of attracted toner (g)
There is an appropriate value for the charge amount obtained in this way, and it is not good because it is too high or too low. In the present invention, the charge amount of conventional toner base particles (cyan toner base particles mounted on a digital full-color multifunction peripheral, Image MP C4002 (manufactured by Ricoh Co., Ltd.)) was used as a reference value, and evaluation was performed according to the following evaluation criteria.
〔Evaluation criteria〕
A: Charge amount equivalent to that of conventional toner (reference value −40 μC / g or more and less than −30 μC / g)
○: Slightly low charge, but usable (-30 μC / g or more and less than -20 μC / g)
Δ: Charge amount is low and difficult to use (-20 μC / g or more and less than -10 μC / g)
X: Charge amount is too low to be used (-10 μC / g or more)

<Image gloss>
A copy test was performed on POD gloss coat 128 g / m ² (manufactured by Oji Paper Co., Ltd.) using an apparatus in which the fixing unit of imagiMP C5002 (manufactured by Ricoh Co., Ltd.) was modified.
Specifically, the glossiness of an image that has been passed at a fixing temperature of 140 degrees was obtained. The image after the copying test was measured for 60 degree gloss with a gloss meter VG-7000 (Nippon Denshoku Co., Ltd.).
The fixing evaluation conditions were a paper feed linear velocity of 100 mm / second, a surface pressure of 1.0 kgf / cm ² , and a nip width of 7 mm.
〔Evaluation criteria〕
◎: Glossiness is 20% or more ○: Glossiness is 15% or more and less than 20% △: Glossiness is 10% or more and less than 15% ×: Glossiness is less than 10%

<Fixability>
A copy test was performed on type 6200 paper (manufactured by Ricoh Co., Ltd.) using an apparatus in which the fixing unit of imageo MP C5002 (manufactured by Ricoh Co., Ltd.) was modified.
Specifically, the cold offset temperature (fixing lower limit temperature) and the high temperature offset temperature (fixing upper limit temperature) were determined by changing the fixing temperature.
The evaluation conditions for the minimum fixing temperature were a paper feed linear velocity of 200 mm / second, a surface pressure of 1.0 kgf / cm ² , and a nip width of 7 mm.
Further, the evaluation conditions for the upper limit fixing temperature were a linear speed of paper feed of 100 mm / second, a surface pressure of 1.0 kgf / cm ² , and a nip width of 7 mm.
The lower the minimum fixing temperature, the better the low-temperature fixability. The lower limit of fixing was evaluated according to the following criteria. On the other hand, if the fixing upper limit temperature is 170 ° C. or higher, the effect of high temperature offset resistance obtained in the present invention is sufficient.
〔Evaluation criteria〕
A: Fixing lower limit temperature is 109 ° C. or less ○: Fixing lower limit temperature is 110 ° C. or more and 114 ° C. or less Δ: Fixing lower limit temperature is 115 ° C. or more and 119 ° C. or less ×: Fixing lower limit temperature is 120 ° C. or more

<Heat resistant storage stability>
Fill a 50 mL glass container with 10 g of toner, tapping well until there is no change in the apparent density of the toner powder, cover the container, leave it in a constant temperature bath at 50 ° C. for 24 hours, then cool to 24 ° C. The penetration (mm) was measured by a penetration test (JIS K2235-1991), and the heat resistant storage stability was evaluated according to the following criteria. In addition, the greater the penetration, the better the heat-resistant storage stability, and those having a penetration of less than 15 mm are more likely to cause problems in use.
〔Evaluation criteria〕
◎: Needle penetration is 25 mm or more ○: Needle penetration is 20 mm or more and less than 25 mm △: Needle penetration is 15 mm or more and less than 20 mm ×: Needle penetration is less than 15 mm

(Example 2)
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-2, [Toner Base Particle 2] was obtained in the same manner as in Example 1, and such [Toner Base Particle 2] was used [ Toner 2] was evaluated in the same manner as in Example 1. The results are shown in Table 1-1.
Example 3
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-3, [Toner Base Particle 3] was obtained in the same manner as in Example 1, and [Toner Base Particle 3] was used [ Toner 3] was evaluated in the same manner as in Example 1. The results are shown in Table 1-1.
Example 4
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-4, [Toner Base Particle 4] was obtained in the same manner as in Example 1, and [Toner Base Particle 4] was used [ Toner 4] was evaluated in the same manner as in Example 1. The results are shown in Table 1-1.
(Example 5)
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-5, [Toner Base Particle 5] was obtained in the same manner as in Example 1, and [Toner Base Particle 5] was used [ Toner 5] was evaluated in the same manner as in Example 1. The results are shown in Table 1-2.
(Example 6)
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-6, [Toner Base Particle 6] was obtained in the same manner as in Example 1, and such [Toner Base Particle 6] was used [ Toner 6] was evaluated in the same manner as in Example 1. The results are shown in Table 1-2.

(Comparative Example 1)
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-7, [Toner Base Particle 7] was obtained in the same manner as in Example 1, and [Toner Base Particle 7] was used [ Toner 7] was evaluated in the same manner as in Example 1. The results are shown in Table 2.
(Comparative Example 2)
In Example 1, except that the prepolymer A-1 was replaced with the prepolymer A-8, [Toner Base Particles 8] were obtained in the same manner as in Example 1, and such [Toner Base Particles 8] were used [ Toner 8] was evaluated in the same manner as in Example 1. The results are shown in Table 2.
(Comparative Example 3)
In Example 1, except that Prepolymer A-1 was replaced with Prepolymer A-9, [Toner Base Particle 9] was obtained in the same manner as in Example 1, and [Toner Base Particle 9] was used [ Toner 9] was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Aspects of the present invention are as follows, for example.
<1> A toner containing at least a polyester resin, wherein the polyester resin has a structure represented by any one of structural formulas 1) to 3) below.
1) R1- (NHCONH-R2-X-R3) n-
2) R1- (NHCOO-R2-X-R3) n-
3) R1- (OCONH-R2-X-R3) n-
(Where n = 3
R1: aromatic or aliphatic organic group,
R2: a group derived from a resin comprising at least one of a polycarboxylic acid and a polyol, and a modified polyester obtained by modifying the polyester with an isocyanate;
X: Urea bond or urethane bond,
R3: represents a group derived from a compound represented by the following general formula (I).
[In the above general formula (I), T ₁ , T ₂ , T ₃ , T ₄ and T ₅ each represent either a hydrogen atom or an isocyanate group, at least one of which is an isocyanate group, U ₁ , U ₂ , U ₃ , U ₄ , and U ₅ each represent either a hydrogen atom or an isocyanate group, and at least one is an isocyanate group. ])
<2> The polyester resin contains a diol component as a constituent component, the diol component contains 50 mol% or more of an aliphatic diol having 4 to 12 carbon atoms, and the number of carbon atoms of the portion that becomes the main chain of the diol component Is a toner according to <1>, wherein the diol component has an alkyl group in a side chain.
<3> The polyester resin has a weight average molecular weight (Mw) of 30,000 to 60,000, a weight average molecular weight / number average molecular weight (Mw / Mn) of 6 to 12, and a glass transition temperature of −60 ° C. The toner according to any one of <1> to <2>, which is 0 ° C. or higher.
<4> Using diphenylmethane diisocyanate (MDI) as the compound represented by the general formula (I), the intermediate polyester containing R2 and the diphenylmethane diisocyanate (MDI) are reacted to form the structural formulas 1) to 3). In the case of producing a polyester resin having a structure represented by any one of the above, the polyester resin having the structure represented by any one of the structural formulas 1) to 3) is the intermediate polyester and the diphenylmethane diisocyanate (MDI). Any one of <1> to <3> above, wherein a molar ratio of (isocyanate group of MDI / hydroxyl group of intermediate polyester) is 1.5 to less than 3.0 The toner according to claim 1.
<5> Any one of <1> to <4>, wherein a glass transition temperature (Tg1st) obtained from a first DSC curve of differential scanning calorimetry (DSC) of the toner is 20 ° C. or more and 50 ° C. or less. The toner according to claim 1.
<6> The toner according to any one of <1> to <5>, wherein the polyester resin is insoluble in tetrahydrofuran (THF).
<7> The above <1> to <6>, wherein the polyester resin includes a dicarboxylic acid component as a constituent component, and the dicarboxylic acid component contains 30 mol% or more of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms. The toner described in 1.
<8> Further, the toner contains a second polyester resin having a glass transition temperature of 40 ° C. or higher and 70 ° C. or lower, and has a glass transition temperature (Tg1st) of 20 at the first temperature increase in differential scanning calorimetry (DSC) of the toner. The toner according to any one of <1> to <7>, wherein the toner is at least 50 ° C and at most 50 ° C.
<9> Further, it contains a crystalline polyester resin, the melting point of the crystalline polyester resin is 60 ° C. or more and 80 ° C. or less, and the glass transition temperature at the first temperature increase in differential scanning calorimetry (DSC) of the toner. The toner according to any one of <1> to <8>, wherein a difference (Tg1st−Tg2nd) between (Tg1st) and a second glass transition temperature (Tg2nd) is 10 ° C. or more.
<10> The <9>, wherein the crystalline polyester resin is composed of a linear saturated aliphatic dicarboxylic acid having 4 to 12 carbon atoms and a linear saturated aliphatic diol having 2 to 12 carbon atoms. Toner.
<11> The toner according to any one of <1> to <10>, wherein the isocyanate compound represented by the general formula (I) is diphenylmethane diisocyanate (MDI).
<12> The toner according to any one of <1> to <11>, wherein the structural formulas 1) to 3) are represented by the following structural formulas a) to c).
1) R1- (NHCONH-R3-Y-R2'-X-R3) n-
2) R1- (NHCOO-R3-Y-R2'-X-R3) n-
3) R1- (OCONH-R3-Y-R2'-X-R3) n-
(In the above formula, n, R1, R3, and X represent the same as described in Structural Formulas 1) to 3). R2 ′ is a group derived from polyester, and Y represents a urea bond or a urethane bond. )
<13> A developer comprising the toner according to any one of <1> to <12>.
<14> An electrostatic latent image carrier, an electrostatic latent image forming unit that forms an electrostatic latent image on the electrostatic latent image carrier, and the electrostatic latent image formed on the electrostatic latent image carrier. Developing means comprising toner for developing the image to form a visible image;
An image forming apparatus, wherein the toner is the toner according to any one of <1> to <12>.

  The toner according to any one of <1> to <12>, the developer according to <13>, and the image forming apparatus according to <14> solve the above-described problems, and have the following objects: The goal is to achieve this. That is, a toner having excellent low-temperature fixability, high-temperature offset resistance, high gloss, high color reproducibility, excellent charging characteristics and heat-resistant storage stability, a developer having the toner, and an image forming apparatus using the developer The purpose is to provide.

DESCRIPTION OF SYMBOLS 10 Electrostatic latent image carrier 21 Exposure apparatus 25 Fixing apparatus 61 Developing apparatus 160 Charging apparatus

Japanese Patent Laid-Open No. 11-133665 JP 2002-287400 A JP 2002-351143 A Japanese Patent No. 2579150 JP 2001-158819 A JP 2004-46095 A JP 2007-271789 A Japanese Patent No. 5408210

Claims (10)

A toner containing at least a polyester resin, wherein the polyester resin has a structure represented by any one of the following structural formulas 1) to 3).
1) R1- (NHCONH-R2-X-R3) n-
2) R1- (NHCOO-R2-X-R3) n-
3) R1- (OCONH-R2-X-R3) n-
(Where n = 3
R1: aromatic or aliphatic organic group,
R2: a group derived from a resin comprising at least one of a polycarboxylic acid and a polyol, and a modified polyester obtained by modifying the polyester with an isocyanate;
X: Urea bond or urethane bond,
R3: represents a group derived from a compound represented by the following general formula (I).
[In the above general formula (I), T ₁ , T ₂ , T ₃ , T ₄ and T ₅ each represent either a hydrogen atom or an isocyanate group, at least one of which is an isocyanate group, U ₁ , U ₂ , U ₃ , U ₄ , and U ₅ each represent either a hydrogen atom or an isocyanate group, and at least one is an isocyanate group. ])   The polyester resin contains a diol component as a constituent component, the diol component contains 50 mol% or more of an aliphatic diol having 4 to 12 carbon atoms, and the number of carbon atoms in the portion that becomes the main chain of the diol component is an odd number. The toner according to claim 1, wherein the diol component has an alkyl group in a side chain.   The polyester resin has a weight average molecular weight (Mw) of 30,000 to 60,000, a weight average molecular weight / number average molecular weight (Mw / Mn) of 6 to 12, and a glass transition temperature of −60 ° C. to 0 ° C. The toner according to claim 1, which is:   Diphenylmethane diisocyanate (MDI) is used as the compound represented by the general formula (I), and the intermediate polyester containing R2 is reacted with the diphenylmethane diisocyanate (MDI), so that any one of the structural formulas 1) to 3) When the polyester resin having the structure represented by the formula (1) to 3) is produced, the polyester resin having the structure represented by any one of the structural formulas (1) to (3) comprises the intermediate polyester and the diphenylmethane diisocyanate (MDI) ( 4. The toner according to claim 1, wherein the toner is produced by reacting such that the molar ratio of isocyanate group of MDI / hydroxyl group of the intermediate polyester is 1.5 or more and less than 3.0.   5. The toner according to claim 1, wherein a glass transition temperature (Tg1st) obtained from a DSC curve at the first temperature increase in differential scanning calorimetry (DSC) of the toner is 20 ° C. or higher and 50 ° C. or lower.   The toner according to claim 1, wherein the polyester resin is insoluble in tetrahydrofuran (THF).   The toner according to claim 1, wherein the polyester resin contains a dicarboxylic acid component as a constituent component, and the dicarboxylic acid component contains 30 mol% or more of an aliphatic dicarboxylic acid having 4 to 12 carbon atoms.   The toner according to claim 1, further comprising a second polyester resin having a glass transition temperature of 40 ° C. or higher and 70 ° C. or lower and a crystalline polyester resin.   A developer comprising the toner according to claim 1. An electrostatic latent image carrier, electrostatic latent image forming means for forming an electrostatic latent image on the electrostatic latent image carrier, and developing the electrostatic latent image formed on the electrostatic latent image carrier And a developing means comprising toner for forming a visible image,
An image forming apparatus, wherein the toner is the toner according to claim 1.