JP5049175B2 - Novel photosensitive resin composition, photosensitive resin composition solution obtained therefrom, photosensitive film, insulating film, and printed wiring board with insulating film - Google Patents

Description

  Since this invention has photosensitivity, it can be finely processed, can be developed with a dilute alkaline aqueous solution, can be cured at a low temperature (200 ° C. or less), has high flexibility, electrical insulation reliability, and solder heat resistance. , A photosensitive resin composition having excellent resistance to organic solvents, low warpage of a substrate after curing, and excellent adhesion to a sealant, a cured film obtained therefrom, an insulating film, and a printed wiring board with an insulating film It is.

  Polyimide resins are widely used in electrical and electronic applications because of their excellent heat resistance, electrical insulation reliability, chemical resistance, and mechanical properties. For example, it is used to form insulating films and protective coatings on semiconductor devices, base materials such as flexible circuit boards and integrated circuits, surface protective materials, and further, interlayer insulating films and protective films for fine circuits. .

  In particular, when used as a surface protection material for a flexible circuit board, a coverlay film obtained by applying an adhesive to a molded body such as a polyimide film has been used. When bonding this coverlay film on a flexible circuit board, there is a method in which an opening is provided in advance by a method such as punching in a terminal portion of a circuit or a joint portion with a component, and after aligning, a method of thermocompression bonding by a hot press or the like is used. It is common.

  However, it is difficult to provide a high-accuracy opening in a thin coverlay film, and since the alignment at the time of lamination is often performed manually, the positional accuracy is poor and the workability of the lamination is also poor. The cost was high.

  On the other hand, a liquid cover coat ink or the like may be used as a surface protection material for a circuit board. In particular, a liquid cover coat ink having a photosensitive function is preferably used when fine processing is required. Yes. As the liquid cover coat ink, a photosensitive ink mainly composed of epoxy resin or the like (generally also referred to as a solder resist) is used. This ink is excellent in electrical insulation reliability as an insulating material, but is bent. Therefore, when it is laminated on a thin and flexible circuit board such as a flexible circuit board, the warpage of the board becomes large and it is difficult to use it for a flexible circuit board.

  In recent years, various proposals have been made as liquid cover coat inks that can exhibit flexibility and high electrical insulation reliability.

  For example, a photosensitive resin composition (for example, see Patent Document 1) containing a polyimide resin using siloxane diamine and a photosensitive resin composition made of a polyamic acid solution that is a polyimide precursor has been proposed (for example, (See Patent Documents 2-3).

  Also, a photosensitive resin composition comprising a urethane compound obtained by reacting a diisocyanate compound and a monovinyl monohydroxy compound having an alicyclic skeleton with a polycarbonate diol, which has excellent flexibility, photocurability and insulating properties and is capable of alkali development. Has been proposed (see, for example, Patent Documents 4 to 5).

In addition, it has excellent heat resistance, electrical properties, and photocurability, can be patterned by development with dilute aqueous alkali, is soluble in solvents, has a urethane bond in the main chain, and has a (meth) acryloyl group and a carboxyl group. There has been proposed an active energy ray-curable resin composition made of a polyimide resin having the following. (For example, refer to Patent Document 6).
JP 9-100350 A JP-A-2-50161 JP 2005-148611 A JP 2000-95837 A JP 2000-241969 JP 2000-344890

  However, in the above-mentioned Patent Document 1, when a polyimide-type photosensitive resin composition is used as a cover coat ink, since it is a high molecular weight polyimide solution, the solubility in a solvent is low and the concentration of the solute is increased. For example, when forming a coating film, it is necessary to volatilize a large amount of solvent, and there is a problem that productivity is poor. Moreover, in said patent documents 2-3, in addition to said problem, the thermosetting temperature of high temperature (300 degreeC or more) is required in order to accelerate | stimulate the imidation reaction of a polyamic acid, There was also a problem that it could not be used as a protective insulating layer.

  Moreover, in said patent documents 1-3, the solubility to the dilute alkaline aqueous solution generally used as a developing solution of the photosensitive ink for printed wiring boards is scarce, and the organic solvent type developing solution must be used. For this reason, there existed a problem that work environment and workability were bad. Furthermore, silicon diamine is used to introduce a flexible skeleton, and it is known that the flexibility and electrical insulation reliability of the cured film are greatly improved by using this, When used for an insulating coating, there is a problem of poor adhesion (adhesiveness) with the sealant resin. Furthermore, oligomers contained in siloxane diamine have problems such as inducing malfunction of semiconductors, and are becoming difficult to use.

  In the above-mentioned Patent Document 4, the electrical insulation reliability and heat resistance under high temperature and high humidity are poor as compared with the case where a polyimide type or polyamic acid type photosensitive resin composition is used as the cover coat ink. In Patent Document 5, a phosphoric ester-based additive type flame retardant is added for the purpose of imparting flame retardancy, and hydrolysis of this flame retardant causes a significant decrease in electrical insulation reliability, and in addition, curing. There were problems such as bleeding out of the flame retardant from the film and elution into the organic solvent and gold plating bath.

  In the above-mentioned Patent Document 6, a polyimide resin having a urethane bond in the main chain and having a (meth) acryloyl group and a carboxyl group has a low number average molecular weight, includes a rigid skeleton, and includes a soft segment having flexibility. In addition, since it has a carboxyl group randomly at the end and side chain of the main chain, it has poor flexibility and large curing shrinkage, so it can be used as a protective insulating layer for thin and flexible circuit boards such as flexible circuit boards There was a problem that could not be done.

  In view of the above situation, the problem of the present invention is that it has photosensitivity, can be finely processed, can be developed with a dilute alkaline aqueous solution, can be cured at a low temperature (200 ° C. or less), has high flexibility, An object of the present invention is to provide a photosensitive resin composition that is excellent in insulation reliability, solder heat resistance, and organic solvent resistance, has low warpage of the substrate after curing, and is excellent in adhesion to a sealant.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by using the following photosensitive resin composition.

  That is, the present invention comprises (A) a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain and having a developing group and a photosensitive group in the side chain, and (B) at least a photosensitive group in the molecule. A photosensitive compound that is not (a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developing group and a photosensitive group in the side chain), (C) a photopolymerization initiator And (D) a photosensitive resin composition containing at least a thermosetting compound.

  Moreover, it is preferable that the imide skeleton of the (A) polyimide resin is an etherimide skeleton.

  It is also preferable that at least the developing group and the photosensitive group of the side chain have a structure in which both are bonded to one side chain branched from the main chain.

  Moreover, it is also preferable that the developable group of the (A) polyimide resin is a carboxyl group, and the photosensitive group of the (A) polyimide resin and (B) the photosensitive compound is a (meth) acryloyl group.

  The (A) polyimide resin is at least (a1) a hydroxyl-terminated etherimide oligomer represented by the following general formula (1), (a2) a polycarbonate diol represented by the following general formula (2), and (a3) the following general A side chain carboxyl group-containing polyimide resin obtained by reacting a dihydroxycarboxylic acid compound represented by the formula (3), (a4) a diisocyanate compound represented by the following general formula (4), and (a5) an epoxy in the molecule It is also preferred that it is a (A1) polyimide resin obtained by reacting a group and a compound having at least one (meth) acryloyl group and (a6) a polybasic acid anhydride.

General formula (1)
(Wherein X represents a tetravalent organic group having at least one ether bond, Y represents a divalent organic group, and a plurality of R _{1 s} independently represent a divalent organic group. P represents It is an integer from 0 to 20.)

General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)

General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)

General formula (4)
(In the formula, R ₄ is a divalent organic group.)
The (a1) hydroxyl-terminated etherimide oligomer is a tetracarboxylic dianhydride having at least one ether bond in the molecule represented by the following general formula (5) or the following general formula (6): It is also preferable to obtain it by reacting the amino alcohol represented by the general formula (7).

General formula (5)
(In the formula, R ₅ represents a divalent organic group.)

General formula (6)

General formula (7)
(Wherein R ₆ is a divalent organic group.)
The (a1) hydroxyl group-terminated etherimide oligomer is in a molar ratio (number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule / number of moles of amino alcohol) = 0.25 to 0. It is also preferable to react within the range of .75.

  The (a1) hydroxyl-terminated etherimide oligomer is preferably obtained by further reacting with a diamino compound represented by the following general formula (8).

General formula (8)
(Wherein R ₇ is a divalent organic group).

  The (a1) hydroxyl group-terminated etherimide oligomer is in a molar ratio of (number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule) / (number of moles of amino alcohol + mol of diamino compound). Number) = 0.25 to 1.0. It is also preferable to obtain the reaction.

  The (A1) polyimide resin has (a1) the number of moles of the hydroxyl group-terminated etherimide oligomer (a1), (a2) the number of moles of the polycarbonate diol (a2), and (a3) the number of moles of the dihydroxycarboxylic acid compound. (A3), (a4) When the number of moles of the diisocyanate compound is (a4), [(a1) + (a2) + (a3)] / (a4) = 0.5 to 1.5, and , [(A1) + (a2)] / (a3) = 0.1 to 5.0, and (a5) an epoxy group and at least one (meth) acryloyl group in the molecule When the number of moles of the compound is (a5) and the number of moles of the (a6) polybasic acid anhydride is (a6), (a3) / (a5) = 1.0 to 2.0, and ( a5) / (a6) = reacted within the range of 1.0 to 2.0 It is also preferred that the obtained Te.

  The (A) polyimide resin is at least (a2) a polycarbonate diol represented by the following general formula (2), (a3) a dihydroxycarboxylic acid compound represented by the following general formula (3), and (a4) the following general formula. The terminal isocyanate compound represented by the following general formula (9) obtained by reacting the diisocyanate compound represented by (4), and (a7) in the molecule represented by the following general formula (5) or the following general formula (6) A side chain carboxyl group-containing polyimide resin obtained by reacting a tetracarboxylic dianhydride having at least one ether bond, and (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule And (a6) It is also preferable that it is a polyimide resin (A2) obtained by making a polybasic acid anhydride react.

General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)

General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)

General formula (4)
(In the formula, R ₄ is a divalent organic group.)

General formula (9)
(In the formula, a plurality of R ₂ each independently represents a divalent organic group, R ₃ represents at least a trivalent organic group, and a plurality of R ₄ each independently represents a divalent organic group. q, l, m, and n are integers of 1 to 20.)

General formula (5)
(In the formula, R ₅ represents a divalent organic group.)

General formula (6).

  The (A2) polyimide resin has (a2) the number of moles of polycarbonate diol (a2), (a3) the number of moles of dihydroxycarboxylic acid compound (a3), and (a4) the number of moles of diisocyanate compound (a4). In the range [(a2) + (a3)] / (a4) = 0.4 to 0.9, and (a7) a tetracarboxylic acid having at least one ether bond in the molecule. When the number of moles of acid dianhydride is (a7), the reaction is carried out within the range of (a4) / (a7) = 0.5 to 5.0, and (a5) at least an epoxy group and at least one molecule. When the number of moles of the compound having one (meth) acryloyl group is (a5) and the number of moles of the (a6) polybasic acid anhydride is (a6), (a3) / (a5) = 1.0 to 2.0 and (a5) / (a6 = It is also preferably obtained by reacting in the range of 1.0 to 2.0.

  The (A2) polyimide resin has a terminal isocyanate compound represented by the general formula (9) and (a7) at least one ether bond in the molecule represented by the general formula (5) or the general formula (6). A side chain carboxyl group-containing polyimide resin obtained by reacting tetracarboxylic dianhydride and further reacting with (a8) a diamino compound represented by the following general formula (8), and (a5) epoxy in the molecule It is also preferable that the compound is obtained by reacting a group having at least one (meth) acryloyl group and (a6) a polybasic acid anhydride.

General formula (8)
(Wherein R ₇ is a divalent organic group).

  The (A2) polyimide resin has (a7) the number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule as (a7) and the number of moles of (a8) diamino compound as (a8). In this case, it is also preferable that the reaction is performed within the range of (a7) / (a8) = 1.0 to 5.0.

  Further, the weight ratio of the component (A), the component (B), the component (C), and the component (D) in the photosensitive resin composition is such that the component (B) is based on 100 parts by weight of the component (A). The component (C) is preferably 0.1 to 20 parts by weight, and the component (D) is preferably 0.5 to 100 parts by weight.

  Another invention of the present invention is a photosensitive resin composition solution obtained by dissolving the above photosensitive resin composition in an organic solvent.

  Another invention of the present invention is a photosensitive film obtained by applying and drying the above photosensitive resin composition on a substrate surface.

  Moreover, another invention of the present invention is an insulating film obtained by curing the photosensitive resin composition.

  Another invention of the present invention is a printed wiring board with an insulating film in which the printed resin board is coated with the photosensitive resin composition.

  Since the photosensitive resin composition of the present invention has photosensitivity, it can be finely processed, can be developed with a dilute alkaline aqueous solution, can be cured at a low temperature (200 ° C. or less), is highly flexible, and has electrical insulation. It exhibits excellent reliability, solder heat resistance, and organic solvent resistance, small warpage of the substrate after curing, and excellent adhesion to the sealant.

The composition of the present invention is (A) a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developing group and a photosensitive group in the side chain, and (B) a photosensitive group in the molecule. At least one photosensitive compound that is not (polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developing group and a photosensitive group in the side chain), (C) photopolymerization initiation It is a photosensitive resin composition characterized by containing an agent and (D) a thermosetting compound.
Hereinafter, each constituent material will be described.

<(A) Polyimide resin>
The polyimide resin of the present invention is a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developable group and a photosensitive group in the side chain. The polymer preferably has a number average molecular weight of 6000 or more and 100,000 or less in terms of polyethylene glycol.
The imide skeleton is preferably an etherimide skeleton.
Here, the etherimide skeleton is a skeleton having an ether bond derived from a tetracarboxylic dianhydride having at least one ether bond in the molecule and at least one imide ring.

  The photosensitive resin composition containing a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain of the present invention, and having a developing group and a photosensitive group in the side chain, surprisingly has various properties. The present inventors have found that it is excellent, but it is speculated that this may be due to the following reason. In other words, when it has an imide skeleton, polycarbonate skeleton, and urethane bond in the main chain, it has excellent heat resistance and electrical insulation reliability derived from the imide skeleton, chemical resistance and flexibility derived from the polycarbonate skeleton and urethane bond, and development of the side chain. Developability and photosensitivity derived from a functional group and a photosensitive group. In particular, in the case of an etherimide skeleton, not only is the heat resistance and electrical insulation reliability derived from the imide skeleton extremely superior, but surprisingly, the flexibility of the molecular chain of the etherimide skeleton and the flexibility of the polycarbonate skeleton and urethane bond are surprising. As a result, the flexibility of the molecular chain is improved due to a synergistic effect with the property, and as a result, the degree of freedom of the developing group and the photosensitive group of the side chain is improved, so that the solubility of the polyimide resin is increased and the photosensitive group reacts. As a result, it is presumed that, despite the polyimide resin having a relatively high molecular weight, it is excellent in developability and photosensitivity. In addition, when the developing group and the photosensitive group have a structure in which both are bonded to one side chain branched from the main chain, polyimide is used to increase the branching point of the main chain and lower the molecular orientation crystallinity. Improves the solubility of the resin in the solvent. Furthermore, when a thermosetting compound such as epoxy resin or blocked isocyanate is blended and heated, the thermosetting compound reacts with the developing group of the side chain, resulting in a three-dimensional crosslinked structure. Therefore, it is speculated that solder heat resistance, chemical resistance, and electrical insulation reliability may be improved. In addition, since both the developing group and the photosensitive group are bonded to one side chain branched from the main chain, when taking a cross-linked structure by UV irradiation and at the time of development, a remote position branched from the main chain As a result of the development group and the photosensitive group being located on the surface, the degree of freedom of the development group and the photosensitive group is improved, the possibility of contributing to the reaction of the development group and the photosensitive group is increased. It is speculated that the distance will increase and a flexible cross-linked structure will result. Further, when the polyimide resin of the present invention has an ether bond, it has high solubility in various solvents, and therefore can be easily produced without precipitation or precipitation even in the polymerization step.

<(A1) Polyimide resin>
The polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain of the present invention and having a developing group and a photosensitive group in the side chain is not particularly limited as long as it has these structures, but preferably (A1) a hydroxyl-terminated etherimide oligomer represented by the following general formula (1), (a2) a polycarbonate diol represented by the following general formula (2), (a3) a dihydroxycarboxylic acid compound represented by the following general formula (3) (A4) A side chain carboxyl group-containing polyimide resin obtained by reacting a diisocyanate compound represented by the following general formula (4), and (a5) an epoxy group and at least one (meth) acryloyl group in the molecule. (A1) polyimide resin obtained by reacting a compound having (a6) polybasic acid anhydride .

General formula (1)
(Wherein X represents a tetravalent organic group having at least one ether bond, Y represents a divalent organic group, and a plurality of R _{1 s} independently represent a divalent organic group. P represents It is an integer from 0 to 20.)

General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)

General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)

General formula (4)
(Wherein R ₄ is a divalent organic group).

<(A1) Hydroxyl-terminated etherimide oligomer>
(A1) The hydroxyl-terminated etherimide oligomer represented by the following general formula (1) of the present invention is a tetracarboxylic acid having at least one hydroxyl group at the end of the main chain and at least one ether bond inside the main chain. It is an oligomer having an ether bond derived from an acid dianhydride and at least one imide ring, and having a number average molecular weight of usually 10,000 or less in terms of polyethylene glycol.

  Although it will not specifically limit if it is these structures, Preferably, tetracarboxylic dianhydride which has at least 1 ether bond in a molecule | numerator shown by the following general formula (5) or the following general formula (6), and the following It can be obtained by reacting the amino alcohol represented by the general formula (7).

General formula (1)
(Wherein X represents a tetravalent organic group having at least one ether bond, Y represents a divalent organic group, and a plurality of R _{1 s} independently represent a divalent organic group. P represents It is an integer from 0 to 20.)

General formula (5)
(In the formula, R ₅ represents a divalent organic group.)

General formula (6)

General formula (7)
(Wherein R ₆ is a divalent organic group).

  Examples of the tetracarboxylic dianhydride having at least one ether bond in the molecule used as a raw material for the hydroxyl-terminated etherimide oligomer represented by the general formula (5) or (6) of the present invention include, for example, 3, 3 ', 4,4'-oxydiphthalic dianhydride, 3,3', 4,4'-hydroquinone diphthalic dianhydride, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl ] Propane dianhydride, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] hexafluoropropane dianhydride or 4,4'-bis (3,4-dicarboxyphenoxy) diphenyl sulfide Tetracarboxylic dianhydrides such as 3,3 ′, 4,4′-tetracarboxylic dianhydride can be used.

  Particularly preferably, it can be obtained by using 3,3 ′, 4,4′-oxydiphthalic dianhydride or 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride. This is preferable in that the solubility of the hydroxyl-terminated etherimide oligomer in an organic solvent and the compatibility of the resulting polyimide resin with the photosensitive compound can be improved.

  Although it does not specifically limit as amino alcohol used as a raw material of the hydroxyl-terminated etherimide oligomer shown by General formula (7) of this invention, For example, 2-aminoethanol, 3-amino-1-propanol, 4-amino -1-butanol, 5-amino-1-pentanol, 2-aminophenol, 3-aminophenol, 4-aminophenol, 2- (4-aminophenyl) ethanol, 2-amino-m-cresol, 2-amino -P-cresol, 3-amino-o-cresol, 4-amino-o-cresol, 4-amino-m-cresol, 5-amino-o-cresol, 6-amino-m-cresol, 2-amino-1 , 2-diphenylethanol, 2-aminobenzyl alcohol, 3-aminobenzyl alcohol, 4-amino Down benzyl alcohol, 2-aminocyclohexanol, 4-aminocyclohexanol, it can be used 2-amino-cyclopentanol or 1-amino-1-cyclopentane methanol.

  Particularly preferably, by using 2-aminoethanol, 3-amino-1-propanol or 4-amino-1-butanol, the solubility of the resulting hydroxyl-terminated etherimide oligomer in an organic solvent can be improved. Is preferable.

  Moreover, when synthesizing the above hydroxyl-terminated etherimide oligomer, in addition to tetracarboxylic dianhydride having at least one ether bond in the molecule and amino alcohol, diamino represented by the following general formula (8) is used as a chain extender. Compounds can also be used.

General formula (8)
(Wherein R ₇ is a divalent organic group).

Although it does not specifically limit as a diamino compound used as a chain extender of the hydroxyl-terminated etherimide oligomer shown by General formula (8) of this invention, For example, m-phenylenediamine, o-phenylenediamine, p -Phenylenediamine, bis (3-aminophenyl) sulfone, bis (4-aminophenyl) sulfone, 3,4'-diaminobenzophenone, 4,4'-diaminobenzophenone, 3,3'-diaminobenzophenone, 3,3 ' -Diaminodiphenylmethane, 3,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, bis [4- (3 -Aminophenoxy) phenyl] sulfone, bi [4- (4-aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] methane, bis [4- (4-aminophenoxy) phenyl] methane, 2,2-bis [4- ( 3-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2- [4- (4-aminophenoxyphenyl)] [4- (3-aminophenoxy Phenyl)] propane, 1,3-bis (3-aminophenoxy) benzene, 1,4-bis (3-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 1,3-bis ( 4-aminophenoxy) benzene, bis [4- (3-aminophenoxy) phenyl] ether, bis [4- (4-aminophenoxy) phenyl] ether, poly Ritetramethylene oxide-di-p-aminobenzoate, poly (tetramethylene / 3-methyltetramethylene ether) glycol bis (4-aminobenzoate), trimethylene-bis (4-aminobenzoate), p-phenylene-bis (4 -Aminobenzoate), m-phenylene-bis (4-aminobenzoate), bisphenol A-bis (4-aminobenzoate), 2,4-diaminobenzoic acid, 2,5-diaminobenzoic acid, 3,5-diaminobenzoic acid Acid, 3,3′-diamino-4,4′-dicarboxybiphenyl, 4,4′-diamino-3,3′-dicarboxybiphenyl, 4,4′-diamino-2,2′-dicarboxybiphenyl, [Bis (4-amino-2-carboxy) phenyl] methane, [Bis (4-amino-3-carboxy) phenyl] methane, [ (3-amino-4-carboxy) phenyl] methane, [bis (3-amino-5-carboxy) phenyl] methane, 2,2-bis [3-amino-4-carboxyphenyl] propane, 2,2- Bis [4-amino-3-carboxyphenyl] propane, 3,3′-diamino-4,4′-dicarboxydiphenyl ether, 4,4′-diamino-3,3′-dicarboxydiphenyl ether, 4,4′- Diamino-2,2′-dicarboxydiphenyl ether, 3,3′-diamino-4,4′-dicarboxydiphenyl sulfone, 4,4′-diamino-3,3′-dicarboxydiphenyl sulfone, 4,4′- Diamino-2,2′-dicarboxydiphenylsulfone, 2,3-diaminophenol, 2,4-diaminophenol, 2,5-diaminophenol, 3,5-diaminophenol Diaminophenols such as enol, 3,3′-diamino-4,4′-dihydroxybiphenyl, 4,4′-diamino-3,3′-dihydroxybiphenyl, 4,4′-diamino-2,2′-dihydroxy Hydroxyphenyl compounds such as biphenyl, 4,4′-diamino-2,2 ′, 5,5′-tetrahydroxybiphenyl, 3,3′-diamino-4,4′-dihydroxydiphenylmethane, 4,4′-diamino Dihydroxydiphenylmethanes such as −3,3′-dihydroxydiphenylmethane, 4,4′-diamino-2,2′-dihydroxydiphenylmethane, 2,2-bis [3-amino-4-hydroxyphenyl] propane, 2,2- Bis [hydroxyphenyl] propanes such as bis [4-amino-3-hydroxyphenyl] propane, 3,3′-diamino-4,4 Hydroxydiphenyl ethers such as' -dihydroxydiphenyl ether, 4,4'-diamino-3,3'-dihydroxydiphenyl ether, 4,4'-diamino-2,2'-dihydroxydiphenyl ether, 3,3'-diamino-4,4 Dihydroxydiphenyl sulfones such as' -dihydroxydiphenyl sulfone, 4,4'-diamino-3,3'-dihydroxydiphenyl sulfone, 4,4'-diamino-2,2'-dihydroxydiphenyl sulfone, 3,3'-diamino Dihydroxydiphenyl sulfides such as -4,4'-dihydroxydiphenyl sulfide, 4,4'-diamino-3,3'-dihydroxydiphenyl sulfide, 4,4'-diamino-2,2'-dihydroxydiphenyl sulfide, 3'-diamino-4,4'-dihydro Dihydroxydiphenyl sulfoxides such as xyldiphenyl sulfoxide, 4,4′-diamino-3,3′-dihydroxydiphenyl sulfoxide, 4,4′-diamino-2,2′-dihydroxydiphenyl sulfoxide, 2,2-bis [4- Bis [(hydroxyphenyl) phenyl] alkane compounds such as (4-amino-3-hydroxyphenoxy) phenyl] propane, bis (hydrido) such as 4,4′-bis (4-amino-3-hydroxyphenoxy) biphenyl Xyphenoxy) biphenyl compounds, bis [(hydroxyphenoxy) phenyl] sulfone compounds such as 2,2-bis [4- (4-amino-3-hydroxyphenoxy) phenyl] sulfone, 4,4′-diamino-3, 3'-dihydroxydiphenylmethane, 4,4'-diamino-2,2'-dihai Bis (hydroxyphenoxy) biphenyl compounds such as roxydiphenylmethane, 2,2-bis [3-amino-4-carboxyphenyl] propane, 4,4′-bis (4-amino-3-hydroxyphenoxy) biphenyl, 1,2-diaminocyclohexane, 1,3-diaminocyclohexane, 1,4-diaminocyclohexane, 1,4-cyclohexanebis (methylamine), 4,4′-diaminodicyclohexylmethane, (4-amino-3-methylcyclohexyl) ) Methane, 5-amino-1,3,3-trimethylcyclohexanemethylamine, 3 (4), 8 (9) -bis (aminomethyl) tricyclo [5.2.1.0 ^2,6 ] decane, 2, Alicyclics such as 5 (6) -bis (aminomethyl) bicyclo [2.2.1] heptane, 1,3-diaminoadamantane Amines, tetramethylenediamine, hexamethylenediamine, 1,12-aliphatic diamines diamino dodecane, polyoxyethylene polyoxyalkylene diamines, such as polyoxyethylene diamine or polyoxypropylene diamines and the like.

  Particularly preferably, m-phenylenediamine, 3,3′-diaminodiphenylmethane, bis [4- (4-aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] sulfone, bis [4- ( 3-aminophenoxy) phenyl] methane, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 1,3-bis (3-aminophenoxy) benzene, 1,4-bis (3-aminophenoxy) Heat resistance and electrical insulation reliability of polyimide resin obtained by using aromatic diamine such as benzene), 1,4-bis (4-aminophenoxybenzene) or 1,3-bis (4-aminophenoxybenzene) It is preferable at the point which can improve.

  The raw materials represented by the above general formula (5), general formula (6), general formula (7) and general formula (8) may be used alone or in combination of two or more. You may do it. Moreover, you may use the raw material shown by General formula (5) and General formula (6) simultaneously.

  The method for synthesizing the hydroxyl-terminated etherimide oligomer represented by the general formula (1) of the present invention is a tetracarboxylic dianhydride having at least one ether bond in the molecule represented by the general formula (5) or the general formula (6). Product and the amino alcohol represented by the general formula (7) in a molar ratio, preferably (number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule / number of moles of amino alcohol) = 0 .25 to 0.75, more preferably 0.3 to 0.7, and particularly preferably 0.4 to 0.6.

  By controlling the addition amount within the above range and reacting, it is preferable because the hydroxyl-terminated etherimide oligomer can be obtained without generation of unreacted products and by-products. When it is smaller than 0.25, a large amount of unreacted aminoethanol remains in the system, and when used in the photosensitive resin composition, heat resistance and electrical insulation reliability may be lowered. Moreover, when larger than 0.75, the yield of the target hydroxyl-terminated etherimide oligomer may become low.

  When the diamino compound represented by the general formula (8) is used as a chain extender, the reaction is carried out by adding tetracarboxylic dianhydride having at least one ether bond in the molecule and amino alcohol. Yes, but not limited to this. The added amount of the diamino compound is preferably (molar number of tetracarboxylic dianhydride having at least one ether bond in the molecule) / (molar number of amino alcohol + molar number of diamino compound) = It can be obtained by reacting in the range of 0.25 to 1.0, more preferably 0.3 to 0.9, and particularly preferably 0.4 to 0.8.

  By controlling the addition amount within the above range and reacting, it is preferable because the molecular weight of the hydroxyl-terminated etherimide oligomer can be controlled within the optimum range. When it is smaller than 0.25, a large amount of unreacted material remains in the system, and thus when used in the photosensitive resin composition, the heat resistance and the electrical insulation reliability may be lowered. Moreover, when larger than 1.0, the molecular weight of a hydroxyl-terminated imide oligomer will become large, and when it uses for the photosensitive resin composition, developability may fall.

  In the hydroxyl-terminated etherimide oligomer, each component is dissolved in an organic solvent at 100 ° C. or lower, preferably 80 ° C. or lower, and then heated at 100 ° C. or higher and 300 ° C. or lower, preferably 150 ° C. or higher and 250 ° C. or lower. This can be obtained while proceeding with the imidization reaction. Various catalysts may be used in the imidization reaction.

Examples of the organic solvent used when the hydroxyl-terminated etherimide oligomer is reacted include sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, and formamide solvents such as N, N-dimethylformamide and N, N-diethylformamide. Acetamide solvents such as N, N-dimethylacetamide and N, N-diethylacetamide, pyrrolidone solvents such as N-methyl-2-pyrrolidone and N-vinyl-2-pyrrolidone, phenol, o-, m- or p -Phenol solvents such as cresol, xylenol, halogenated phenol, catechol, or hexamethylphosphoramide, γ-butyrolactone, methylmonoglyme (1,2-dimethoxyethane), methyldiglyme (bis (2-methoxyether) D Ter), methyltriglyme (1,2-bis (2-methoxyethoxy) ethane), methyltetraglyme (bis [2- (2-methoxyethoxyethyl)] ether), ethyl monoglyme (1,2-diethoxy) Ethane), ethyl diglyme (bis (2-ethoxyethyl) ether), symmetric glycol diethers such as butyl diglyme (bis (2-butoxyethyl) ether), methyl acetate, ethyl acetate, isopropyl acetate, n-propyl Acetate, butyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate (also known as carbitol acetate, 2- (2-butoxyethoxy) ethyl acetate)), diethylene glycol Acetates such as nobutyl ether acetate, 3-methoxybutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, propylene glycol diacetate, 1,3-butylene glycol diacetate, Propylene glycol methyl ether, tripropylene glycol methyl ether, propylene glycol n-propyl ether, dipropylene glycol n-propyl ether, propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripylene glycol n-propyl ether, propylene glycol phenyl Ether, dipropylene glycol dimethyl ether, 1,3 It dioxolane, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, also possible to use diethylene glycol monobutyl ether or solvent ethers such as ethylene glycol monoethyl ether. If necessary, low-boiling hexane, acetone, toluene, xylene and the like can be used in combination. The solvent may be used alone or in combination of two or more.
Among them, symmetric glycol diethers are particularly preferable because of high solubility of oligomers.

  The amount of the organic solvent used in the reaction is preferably such that the solute weight concentration in the reaction solution is 5 wt% or more and 80 wt% or less, more preferably 10 wt% or more and 60 wt% or less. Is 15% by weight or more and 50% by weight or less, whereby a uniform and transparent hydroxyl-terminated etherimide oligomer solution can be obtained. When the solution concentration is 5% by weight or less, the contact efficiency of each component is deteriorated, the reaction is difficult to occur, and the reaction rate may be reduced. When the solution concentration is 80% by weight or more, each component is not completely dissolved in the organic solvent, a uniform reaction does not occur, and a desired structural substance may not be obtained.

  The hydroxyl-terminated etherimide oligomer produced as described above is preferable because it can be handled as a hydroxyl-terminated etherimide oligomer solution as it is in the reaction solution so that it can be easily handled in the next step and the reaction can proceed uniformly. .

<(A2) Polycarbonate diol>
The (a2) polycarbonate diol of the present invention is a diol compound having a repeating unit having a carbonate skeleton represented by the general formula (2). For example, alkylene such as 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,12-dodecanediol, etc. It can be obtained by reacting a diol alone or in combination of two or more with a carbonate compound such as dialkyl carbonate, alkylene carbonate or diphenyl carbonate.

  Further, the number average molecular weight of the polycarbonate diol is preferably in the range of 500 to 5000, more preferably 750 to 2500 in terms of polystyrene, whereby the chemical resistance and flexibility of the resulting polyimide resin can be improved. This is preferable. When the number average molecular weight is less than 500, the flexibility of the obtained polyimide resin is lowered, and when it is 5000 or more, the developability may be lowered.

  Examples of the polycarbonate diol include trade names PCDL T-4671, T-4672, T-4691, T-4692, T-5650J, T-5651, T-5562, T-6601, T manufactured by Asahi Kasei Chemicals Corporation. -6002, Daicel Chemical Industries, Ltd. trade name Plaxel CD CD205, CD205PL, CD205HL, CD210, CD210PL, CD210HL, CD220, CD220PL, CD220HL, Kuraray Co., Ltd. trade names Kuraray Polyol C-1015N, C-1050, C -1065N, C-1090, C-2015N, C-2065N, C-2090, those sold by Nippon Polyurethane Industry Co., Ltd. under the trade names NIPPOLAN 981, 980R, 982R, etc. Or it can be used in combination of two or more.

<(A3) Dihydroxycarboxylic acid compound>
The (a3) dihydroxycarboxylic acid compound of the present invention is a compound having a carboxyl group and two hydroxyl groups in the molecule, represented by the general formula (3). For example, 2,2-bis (hydroxymethyl) propionic acid, 2,2-bis (2-hydroxyethyl) propionic acid, 2,2-bis (3-hydroxymepropyl) propionic acid, 2,3-dihydroxy-2 -Methylpropionic acid, 2,2-bis (hydroxymethyl) butanoic acid, 2,2-bis (2-hydroxyethyl) butanoic acid, 2,2-bis (3-hydroxypropyl) butanoic acid, 2,3-dihydroxy Butanoic acid, 2,4-dihydroxy-3,3-dimethylbutanoic acid, 2,3-dihydroxyhexadecanoic acid, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2 , 6-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, etc., and these may be used alone or as 2 It can be used in combination of at least class. By using these dihydroxycarboxylic acid compounds, the developability of the polyimide resin is improved, and the solder heat resistance, chemical resistance, and electrical insulation reliability are improved because a three-dimensional cross-linked structure is formed by reaction with the thermosetting compound. .

<(A4) Diisocyanate compound>
The (a4) diisocyanate compound of the present invention is a compound having two isocyanate groups in the molecule represented by the general formula (4). For example, aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, naphthalene diisocyanate, tolidine diisocyanate, tetramethylxylene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, etc. Aliphatic diisocyanates such as alicyclic diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate, and the like can be used alone or in combination of two or more. Among these diisocyanate compounds, preferably, tolylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate is used to improve the heat resistance and electrical insulation reliability of the resulting polyimide resin.

<(A5) Compound having an epoxy group and at least one (meth) acryloyl group in the molecule>
Examples of the compound (a5) having an epoxy group and at least one (meth) acryloyl group in the molecule of the present invention include glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate glycidyl ether, and 3,4-epoxy. Examples thereof include cyclohexylmethyl (meth) acrylate and bisphenol A diglycidyl ether mono (meth) acrylate, and these can be used alone or in combination of two or more. Among these compounds having an epoxy group and at least one (meth) acryloyl group in the molecule, preferably a polyimide resin obtained by using glycidyl (meth) acrylate or 3,4-epoxycyclohexylmethyl (meth) acrylate This improves the photosensitivity and electrical insulation reliability.

<(A6) Polybasic acid anhydride>
Examples of the (a6) polybasic acid anhydride of the present invention include maleic anhydride, succinic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexa Examples include dicarboxylic anhydrides such as hydrophthalic anhydride, aromatic polycarboxylic anhydrides such as trimellitic anhydride and pyromellitic dianhydride, and these are used alone or in combination of two or more. it can. Among these polybasic acid anhydrides, gelation associated with three-dimensional crosslinking due to side reactions can be suppressed by using a dicarboxylic acid anhydride.

<(A1) Ratio of constituent components of polyimide resin>
The (A1) polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain (A) of the present invention, a developing group in the side chain, and a photosensitive group in the terminal is firstly at least (a1 ) Hydroxyl group-terminated etherimide oligomer, (a2) polycarbonate diol, (a3) dihydroxycarboxylic acid compound, (a4) diisocyanate compound to synthesize side chain carboxyl group-containing polyimide resin, and then (a5) epoxy group in the molecule And a compound having at least one (meth) acryloyl group and (a6) a polybasic acid anhydride.

  The blending molar ratio of the components (a1), (a2), (a3) and (a4) is preferably when the number of moles is (a1), (a2), (a3) and (a4), [(A1) + (a2) + (a3)] / (a4) = 0.5 to 1.5, more preferably 0.75 to 1.25, and particularly preferably 0.9 to 1.1. is there.

  By controlling the addition amount within the above range and reacting, it is preferable because the molecular weight of the polyimide resin can be controlled within the optimum range. When it is smaller than 0.5 or larger than 1.5, a large amount of unreacted substances remain in the system, so that when used in the photosensitive resin composition, heat resistance and electrical insulation reliability may be lowered. is there.

  At this time, preferably, [(a1) + (a2)] / (a3) = 0.1 to 5.0, more preferably 0.2 to 3.0, and particularly preferably 0.3 to By reacting within the range of 2.0, it is preferable in order to balance the heat resistance, electrical insulation reliability, flexibility, and developability of the polyimide resin. If it is smaller than 0.1, the heat resistance, electrical insulation reliability and flexibility of the polyimide resin are lowered, and if it is larger than 5.0, the developability of the polyimide resin may be lowered.

  Next, the mixing molar ratio of the components (a5) and (a6) to be reacted is preferably (a3) / (a5) = 1.0 to 2 when the respective mole numbers are (a5) and (a6). 0.0, more preferably 1.0 to 1.5, particularly preferably 1.0 to 1.25, and (a5) / (a6) = 1.0 to 2.0, more preferably 1 0.0 to 1.5, particularly preferably 1.0 to 1.25.

  Controlling the amount of addition within the above range is preferable for achieving a balance between the photosensitivity, flexibility and developability of the polyimide resin. When it is less than 1.0, unreacted substances remain in the system. Therefore, when used in a photosensitive resin composition, the coating film becomes sticky after drying the solvent, resulting in a decrease in electrical insulation reliability. If it is greater than 0.0, the photosensitivity of the polyimide resin may decrease.

  The (A1) polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain (A1) and having a developing group and a photosensitive group in the side chain is represented by the general formula (1). A residue obtained by removing two hydroxyl groups from a hydroxyl-terminated etherimide oligomer, a residue obtained by removing two hydroxyl groups from a polycarbonate diol represented by the general formula (2), and a dihydroxycarboxylic acid represented by the general formula (3) A residue obtained by removing two hydroxyl groups from the compound and a residue obtained by removing two isocyanate groups from the diisocyanate compound represented by the general formula (4) are contained as repeating units in the main chain skeleton, and the general formula (5 A residue obtained by removing an epoxy group from a compound having an epoxy group and at least one (meth) acryloyl group in the molecule represented by And a copolymer having at least one side chain branched from the main chain having a residue obtained by removing one carboxyl group from the polybasic acid anhydride represented by the general formula (6), and repeating in the main chain skeleton The unit may be random copolymerization or block copolymerization.

<(A1) Polyimide resin production method>
(A) The main chain of the present invention (A) has an etherimide skeleton, a polycarbonate skeleton, and a urethane bond, and the side chain has a developable group and a photosensitive group.
Step 1: (a1) hydroxyl group-terminated etherimide oligomer solution, (a2) polycarbonate diol, (a3) dihydroxycarboxylic acid compound, and (a4) diisocyanate compound are simultaneously charged in a reaction vessel and reacted in an organic solvent, or (A1) Hydroxyl-terminated etherimide oligomer solution, then (a2) polycarbonate diol and (a3) dihydroxycarboxylic acid compound are charged into a reaction vessel, and then stirred in an organic solvent while (a4) diisocyanate compound solution is added dropwise. A side chain carboxyl group-containing polyimide resin solution is obtained by a reaction method.
Step 2: The side chain carboxyl group-containing polyimide resin solution obtained in Step 1 above, and (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule are charged into a reaction vessel simultaneously in an organic solvent. Or the side chain carboxyl group-containing polyimide resin solution obtained in the above step 1 is charged into a reaction vessel, and then stirred in an organic solvent (a5) with at least one epoxy group in the molecule and A side chain photosensitive group-containing polyimide resin solution is obtained by a method of reacting while dropping a compound solution having a (meth) acryloyl group.
Step 3: A method in which the side chain photosensitive group-containing polyimide resin solution obtained in Step 2 above and (a6) a polybasic acid anhydride are simultaneously charged in a reaction vessel and reacted in an organic solvent, or in Step 2 above By charging the obtained side chain photosensitive group-containing polyimide resin solution into a reaction vessel and then reacting while dropping in a polybasic acid anhydride solution while stirring in an organic solvent, (A) main Examples include a method of obtaining (A1) a polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the chain, and a developable group and a photosensitive group in the side chain. However, the method is limited to these methods. is not.

  The reaction temperature in step 1 is preferably 50 ° C. or higher and 120 ° C. or lower, more preferably 60 ° C. or higher and 110 ° C. or lower, and particularly preferably 70 ° C. or higher and 100 ° C. or lower.

  By controlling the reaction temperature within the above range, the molecular weight of the side chain carboxyl group-containing polyimide resin can be controlled within the optimum range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed, the reaction time is prolonged, and the isocyanate group may be deactivated. When the reaction temperature is 120 ° C. or higher, the reaction is three-dimensional. There is a case where the crosslinking reaction proceeds and gelation occurs.

  At this time, the organic solvent added when producing the hydroxyl group-terminated etherimide oligomer solution can be used as it is for the reaction, or an organic solvent may be added and reacted.

  Furthermore, you may use the catalyst (Tin type | system | group, tertiary amine type | system | group) for promoting reaction as needed.

  The reaction temperature in step 2 is preferably 50 ° C. or higher and 150 ° C. or lower, more preferably 60 ° C. or higher and 130 ° C. or lower, and particularly preferably 70 ° C. or higher and 120 ° C. or lower.

  By controlling the reaction temperature within the above range, side reactions and unreacted product formation can be suppressed, and the molecular weight of the polyimide resin can be controlled within an optimal range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed and the reaction time becomes longer. When the reaction temperature is 120 ° C. or higher, the three-dimensional crosslinking reaction proceeds during the reaction and gelation may occur. is there.

  At this time, the organic solvent added when producing the side chain carboxyl group-containing polyimide resin solution can be used as it is for the reaction, or an organic solvent may be added and reacted.

  Furthermore, a catalyst for promoting the reaction (triphenylphosphine, tertiary amine system, etc.) may be used as necessary.

  In addition, a polymerization inhibitor such as hydroquinone or hydroquinone monomethyl ether is added for the purpose of preventing thermal polymerization reaction of (meth) acryloyl group of the compound having (a5) epoxy group and at least one (meth) acryloyl group in the molecule. May be.

  The reaction temperature in step 3 is preferably 50 ° C. or higher and 150 ° C. or lower, more preferably 60 ° C. or higher and 130 ° C. or lower, and particularly preferably 70 ° C. or higher and 120 ° C. or lower.

  By controlling the reaction temperature within the above range, side reactions and unreacted product formation can be suppressed, and the molecular weight of the polyimide resin can be controlled within an optimal range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed and the reaction time becomes longer. When the reaction temperature is 120 ° C. or higher, the three-dimensional crosslinking reaction proceeds during the reaction and gelation may occur. is there.

  At this time, the organic solvent added when producing the side chain photosensitive group-containing polyimide resin solution can be used as it is for the reaction, or an organic solvent may be added and reacted.

  Furthermore, you may use the catalyst (tertiary amine type etc.) for promoting reaction as needed.

  As the organic solvent used in the above reaction, for example, the organic solvent exemplified at the time of synthesis of the hydroxyl group-terminated etherimide oligomer can be used. Among them, symmetric glycol diethers are particularly preferable because of high solubility of oligomers.

  The amount of the organic solvent used in the reaction is preferably such that the solute weight concentration in the reaction solution is 20 wt% or more and 80 wt% or less, more preferably 30 wt% or more and 70 wt% or less. The viscosity of the resulting polyimide resin solution at 25 ° C. (E-type rotational viscometer) is 1000 mPa. s to 100,000 mPa.s Since it can control to the range of s, it is preferable. When the solution concentration is 20% by weight or less, the viscosity of the photosensitive resin composition solution obtained by blending this polyimide resin becomes low. When the solution concentration is 80% by weight or more, this polyimide resin is blended. The viscosity of the photosensitive resin composition solution obtained in this way becomes high, and in either case, it may be difficult to apply it on a substrate such as a printed wiring board.

<(A2) Polyimide resin>
The polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain of the present invention and having a developing group and a photosensitive group in the side chain is not particularly limited as long as it has these structures, but preferably At least (a2) a polycarbonate diol represented by the following general formula (2), (a3) a dihydroxycarboxylic acid compound represented by the following general formula (3), and (a4) a diisocyanate compound represented by the following general formula (4). A terminal isocyanate compound represented by the following general formula (9) obtained by the reaction; and (a7) a tetracarboxylic acid having at least one ether bond in the molecule represented by the following general formula (5) or the following general formula (6). To the side chain carboxyl group-containing polyimide resin obtained by reacting an acid dianhydride, (a5) epoxy Group and at least one (meth) compound having an acryloyl group and (a6) is reacted with a polybasic acid anhydride obtained by (A2)
It is a polyimide resin.

General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)

General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)

General formula (4)
(In the formula, R ₄ is a divalent organic group.)

General formula (9)
(In the formula, a plurality of R ₂ each independently represents a divalent organic group, R ₃ represents at least a trivalent organic group, and a plurality of R ₄ each independently represents a divalent organic group. q, l, m, and n are integers of 1 to 20.)

General formula (5)
(In the formula, R ₅ represents a divalent organic group.)

General formula (6).

  (A2) polycarbonate diol, (a3) dihydroxycarboxylic acid compound, (a4) diisocyanate compound, (a7) tetracarboxylic dianhydride having at least one ether bond in the molecule, (a5) an epoxy group in the molecule, As the compound having at least one (meth) acryloyl group and (a6) polybasic acid anhydride, the same compounds as those used in the synthesis of the (A1) polyimide resin can be used.

<(A2) Ratio of constituent components of polyimide resin>
(A2) The polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain of the present invention, a developing group in the side chain, and a photosensitive group in the terminal (A2) is at least (a2) A polycarbonate diol, (a3) a dihydroxycarboxylic acid compound, (a4) a diisocyanate compound to synthesize a terminal isocyanate compound, and then (a7) a tetracarboxylic dianhydride having at least one ether bond in the molecule. To synthesize a side chain carboxyl group-containing polyimide resin, and (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule, and (a6) a polybasic acid anhydride. Obtained.

  The blending molar ratio of the components (a2), (a3) and (a4) is preferably [(a2) + (a3) when the respective moles are (a2), (a3) and (a4). ] / (A4) = 0.4 to 0.9, more preferably 0.45 to 0.8, and still more preferably 0.5 to 0.75.

  By controlling the addition amount within the above range and reacting, it is preferable because the molecular weight of the terminal isocyanate compound can be controlled within the optimum range. When it is less than 0.4, a large amount of unreacted material remains in the system. Therefore, when it is used in the photosensitive resin composition, heat resistance and electrical insulation reliability are lowered. In some cases, the molecular weight of the compound increases and the isocyanate group is not located at the terminal.

  Next, the mixing molar ratio of the component (a7) to be reacted is preferably (a4) / (a7) = 0.5 to 5.0, more preferably 0.5, when the number of moles is (a7). It is -3.0, Most preferably, it is 0.5-2.0.

  By controlling the addition amount within the above range and reacting, it is preferable because the molecular weight of the side chain carboxyl group-containing polyimide resin can be controlled within the optimum range. When it is less than 0.5, a large amount of unreacted material remains in the system. Therefore, when it is used in the photosensitive resin composition, heat resistance and electrical insulation reliability are lowered. In some cases, the molecular weight of the carboxyl group-containing polyimide resin increases, resulting in poor solvent solubility and developability.

  Next, the mixing molar ratio of the components (a5) and (a6) to be reacted is preferably (a3) / (a5) = 1.0 to 2 when the respective mole numbers are (a5) and (a6). 0.0, more preferably 1.0 to 1.5, particularly preferably 1.0 to 1.25, and (a5) / (a6) = 1.0 to 2.0, more preferably 1 0.0 to 1.5, particularly preferably 1.0 to 1.25.

  Controlling the amount of addition within the above range is preferable for achieving a balance between the photosensitivity, flexibility and developability of the polyimide resin. When it is less than 1.0, unreacted substances remain in the system. Therefore, when used in a photosensitive resin composition, the coating film becomes sticky after drying the solvent, resulting in a decrease in electrical insulation reliability. If it is greater than 0.0, the photosensitivity of the polyimide resin may decrease.

  In addition, when the (A2) polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, a developing group in the side chain, and a photosensitive group at the terminal is synthesized, at least 1 in the molecule. After reacting a tetracarboxylic dianhydride having two ether bonds to synthesize a side chain carboxyl group-containing polyimide resin, (a8) a diamino compound represented by the following general formula (8) is reacted as a chain extender. Chain extension can be performed, and then (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule, and (a6) a polybasic acid anhydride can be reacted.

General formula (8)
(Wherein R ₇ is a divalent organic group).

  At this time, the (a8) diamino compound may be the same as that used when the hydroxyl group-terminated etherimide oligomer is synthesized.

  The blending molar ratio of the component (a8) is preferably (a7) / (a8) = 1.0 to 5.0, more preferably 1 when the number of moles of the component (a8) is (a8). 0.0-2.5, particularly preferably 1.0-2.0.

  By controlling the addition amount within the above range and reacting, it is preferable because the molecular weight of the side chain carboxyl group-containing polyimide resin can be controlled within the optimum range. When it is less than 1.0, a large amount of unreacted material remains in the system. Therefore, when it is used in the photosensitive resin composition, heat resistance and electrical insulation reliability are lowered. In some cases, the molecular weight of the carboxyl group-containing polyimide resin increases, resulting in poor solvent solubility and developability.

<(A2) Production Method of Polyimide Resin>
(A) The main chain of the present invention (A) has an etherimide skeleton, a polycarbonate skeleton, and a urethane bond, and the side chain has a developable group and a photosensitive group.
Step 1: (a2) polycarbonate diol, (a3) dihydroxycarboxylic acid compound, and (a4) diisocyanate compound are charged simultaneously in a reaction vessel and reacted in an organic solvent, or (a2) polycarbonate diol and (a3) dihydroxy A terminal isocyanate compound solution is obtained by charging the carboxylic acid compound into a reaction vessel and then reacting the solution while dropping the (a4) diisocyanate compound solution while stirring in an organic solvent.
Step 2: The terminal isocyanate compound solution obtained in Step 1 above, (a7) A tetracarboxylic dianhydride having at least one ether bond in the molecule is simultaneously charged into a reaction vessel and stirred while heating in an organic solvent. Or (a7) in a solution in which tetracarboxylic dianhydride having at least one ether bond in the molecule is charged into a reaction vessel and dispersed or dissolved in the organic solvent while stirring in the organic solvent. , A method of stirring and reacting while heating in an organic solvent while dropping the terminal isocyanate compound solution obtained in the above step 1, or (a7) a tetracarboxylic dianhydride having at least one ether bond in the molecule In the reaction vessel, and in the solution dispersed or dissolved in the organic solvent while stirring in the organic solvent, The side chain carboxyl group-containing polyimide resin is prepared by the method of reacting while heating and drying in a vacuum reduced pressure drier in which the solution of the terminal isocyanate compound obtained in step 1 is uniformly dissolved and heated to 100 ° C. to 250 ° C. Get.
Step 3: The side chain carboxyl group-containing polyimide resin obtained in Step 2 above and (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule are simultaneously charged in a reaction vessel and reacted in an organic solvent. Or (a5) epoxy group and at least one (meth) in the molecule while charging the side chain carboxyl group-containing polyimide resin obtained in Step 2 above into a reaction vessel and then stirring in an organic solvent. A side chain photosensitive group-containing polyimide resin solution is obtained by a method of reacting while dropping a compound solution having an acryloyl group.
Step 4: The side chain photosensitive group-containing polyimide resin solution obtained in Step 3 above and (a6) a method in which a polybasic acid anhydride is simultaneously charged in a reaction vessel and reacted in an organic solvent, or in Step 3 above By charging the obtained side chain photosensitive group-containing polyimide resin solution into a reaction vessel and then reacting while dropping in a polybasic acid anhydride solution while stirring in an organic solvent, (A) main Examples include a method of obtaining (A2) a polyimide resin having an etherimide skeleton, a polycarbonate skeleton, and a urethane bond in the chain, and a developable group and a photosensitive group in the side chain. However, the method is limited to these methods. is not.

  The reaction temperature in step 1 is preferably 50 ° C. or higher and 120 ° C. or lower, more preferably 60 ° C. or higher and 110 ° C. or lower, and particularly preferably 70 ° C. or higher and 100 ° C. or lower.

  By controlling the reaction temperature within the above range, the molecular weight of the terminal isocyanate compound can be controlled within the optimum range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed, the reaction time is prolonged, and the isocyanate group may be deactivated. When the reaction temperature is 120 ° C. or higher, the reaction is three-dimensional. There is a case where the crosslinking reaction proceeds and gelation occurs.

  At this time, the reaction can be carried out without a solvent, but in order to control the reaction, it is preferable to carry out the reaction in an organic solvent system. For example, as the organic solvent, the organic compounds exemplified in the synthesis of the hydroxyl-terminated etherimide oligomer can be used. A solvent can be used. Among them, symmetric glycol diethers are particularly preferable because of high solubility of oligomers.

  Furthermore, you may use the catalyst (Tin type | system | group, tertiary amine type | system | group) for promoting reaction as needed.

  The reaction temperature in step 2 is preferably 100 ° C. or higher and 300 ° C. or lower, more preferably 150 ° C. or higher and 250 ° C. or lower, and particularly preferably 170 ° C. or higher and 220 ° C. or lower.

  By controlling the reaction temperature within the above range, the molecular weight of the side chain carboxyl group-containing polyimide resin can be controlled within the optimum range, which is preferable. When the reaction temperature is 100 ° C. or lower, the reaction does not proceed easily and the reaction time becomes longer. When the reaction temperature is 300 ° C. or higher, the three-dimensional crosslinking reaction proceeds during the reaction and gelation may occur. is there.

  At this time, the organic solvent added when producing the terminal isocyanate compound can be used as it is for the reaction, or an organic solvent can be added and reacted.

  Furthermore, you may use the catalyst (tertiary amine type etc.) for promoting reaction as needed.

  The reaction temperature in step 3 is preferably 50 ° C. or higher and 150 ° C. or lower, more preferably 60 ° C. or higher and 130 ° C. or lower, and particularly preferably 70 ° C. or higher and 120 ° C. or lower.

  By controlling the reaction temperature within the above range, side reactions and unreacted product formation can be suppressed, and the molecular weight of the polyimide resin can be controlled within an optimal range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed and the reaction time becomes longer. When the reaction temperature is 120 ° C. or higher, the three-dimensional crosslinking reaction proceeds during the reaction and gelation may occur. is there.

  At this time, the organic solvent added when producing the side chain carboxyl group-containing polyimide resin solution can be used as it is for the reaction, or an organic solvent may be added and reacted.

  Furthermore, a catalyst for promoting the reaction (triphenylphosphine, tertiary amine system, etc.) may be used as necessary.

  In addition, a polymerization inhibitor such as hydroquinone or hydroquinone monomethyl ether is added for the purpose of preventing thermal polymerization reaction of (meth) acryloyl group of the compound having (a5) epoxy group and at least one (meth) acryloyl group in the molecule. May be.

  The reaction temperature in step 4 is preferably 50 ° C. or higher and 150 ° C. or lower, more preferably 60 ° C. or higher and 130 ° C. or lower, and particularly preferably 70 ° C. or higher and 120 ° C. or lower.

  By controlling the reaction temperature within the above range, side reactions and unreacted product formation can be suppressed, and the molecular weight of the polyimide resin can be controlled within an optimal range, which is preferable. When the reaction temperature is 50 ° C. or lower, the reaction is difficult to proceed and the reaction time becomes longer. When the reaction temperature is 120 ° C. or higher, the three-dimensional crosslinking reaction proceeds during the reaction and gelation may occur. is there.

  At this time, the organic solvent added when producing the side chain photosensitive group-containing polyimide resin solution can be used as it is for the reaction, or an organic solvent may be added and reacted.

  Furthermore, you may use the catalyst (tertiary amine type etc.) for promoting reaction as needed.

  As the organic solvent used in the above reaction, for example, the organic solvent exemplified at the time of synthesis of the hydroxyl group-terminated etherimide oligomer can be used. Among them, symmetric glycol diethers are particularly preferable because of high solubility of oligomers.

  The amount of the organic solvent used in the reaction is preferably such that the solute weight concentration in the reaction solution is 20 wt% or more and 80 wt% or less, more preferably 30 wt% or more and 70 wt% or less. The viscosity of the resulting polyimide resin solution at 25 ° C. (E-type rotational viscometer) is 1000 mPa. s to 100,000 mPa.s Since it can control to the range of s, it is preferable. When the solution concentration is 20% by weight or less, the viscosity of the photosensitive resin composition solution obtained by blending this polyimide resin becomes low. When the solution concentration is 80% by weight or more, this polyimide resin is blended. The viscosity of the photosensitive resin composition solution obtained in this way becomes high, and in either case, it may be difficult to apply it on a substrate such as a printed wiring board.

<(B) Photosensitive compound>
(B) In the present invention, (B) having at least one photosensitive group in the molecule (a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developing group and a photosensitive group in the side chain) The photosensitive compound is preferably a compound that has at least one (meth) acryloyl group in the molecule, and a (meth) acryloyl group reacts with a photopolymerization initiator to form a chemical bond.

  For example, ethoxylated bisphenol A di (meth) acrylate, ethoxylated bisphenol F di (meth) acrylate, polyethylene glycol di (meth) acrylate (n = 2-30), polypropylene glycol di (meth) acrylate (n = 2-30) ), 1,4-cyclohexanedimethanol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate , Ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethoxylated totimethylolpropane tri (meth) acrylate, propoxylated totimi Propanetri (meth) acrylate, ethoxylated isocyanuric acid tri (meth) acrylate, ethoxylated pentathritol tetra (meth) acrylate, propoxylated pentathritol tetra (meth) acrylate, caprolactone-modified ditrimethylolpropane tetra (meth) acrylate, ethoxy Dipentaerythritol hexa (meth) acrylate, propoxylated dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate, and the like, but are not limited thereto. In particular, the number of repeating units of EO (ethylene oxide) contained in one molecule of ethoxylated di (meth) acrylate is preferably in the range of 2-50, more preferably in the range of 2-40. By using the EO repeating unit in the range of 2 to 50, the solubility in an aqueous developer typified by an alkaline aqueous solution is improved, and the development time is shortened. In addition, stress hardly remains in the cured film obtained by curing the photosensitive resin composition. For example, among printed wiring boards, when laminated on a flexible printed wiring board based on a polyimide resin, the printed wiring board warps. Features such as being able to be suppressed.

  In particular, it is preferable to use the EO-modified di (meth) acrylate in combination with a photosensitive compound having 3 or more (meth) acrylic groups in order to improve photosensitivity and developability.

  Further, 2-hydroxy-3-phenoxypropyl (meth) acrylate, monohydroxyethyl (meth) acrylate phthalate, ω-carboxy-polycaprolactone mono (meth) acrylate, (meth) acrylic acid dimer, pentaesitol tris and Those having a hydroxyl group or a carbonyl group in the molecular structure skeleton such as tetra (meth) acrylate are also preferably used.

  In addition, any photosensitive compound such as an epoxy (meth) acrylate resin, a polybasic acid anhydride-modified epoxy (meth) acrylate resin, a urethane (meth) acrylate resin, or a polyester (meth) acrylate resin may be used.

<(C) Photopolymerization initiator>
Examples of the (C) photopolymerization initiator in the present invention include benzoin ether compounds such as benzoin methyl ether, benzoin ethyl ether and 1-hydroxycyclohexyl phenyl ketone, and ketal compounds such as benzyl dimethyl ketal and benzyl diethyl ketal; , 2′-diethoxyacetophenone, 2,2′-dibutoxyacetophenone, p-dimethylaminoacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- [4- (2-hydroxyethoxy) ) Phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1- {4- [4- (2-hydroxy-2-methylpropionyl) benzyl] phenyl} -2-methyl Acetophenone compounds such as propane, benzophenone, o Methyl benzoylbenzoate, 3,3′-dimethyl-4-methoxybenzophenone, [4- (methylphenylthio) phenyl] phenylmethane, 4,4′-bis (dimethylamino) benzophenone, 4,4′-bis (diethylamino) ) Benzophenone compounds such as benzophenone and 4-methoxy-4′-dimethylaminobenzophenone, thioxanthone compounds such as thioxanthone, 2-methylthioxanthone, 2-isopropylthioxanthone and 2,4-diethylthioxanthone, ethyl-4-dimethylaminobenzoate Aminobenzoate compounds such as 2-ethylhexyl-4-dimethylaminobenzoate, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino -1- Α-aminoalkyl such as 4-morpholinophenyl) butanone-1,2-dimethylamino-2- (4-methylbenzyl) -1- (4-morpholin-4-yl-phenyl) -butan-1-one Phenone compounds, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4- Phosphine oxide compounds such as trimethylpentylphosphine oxide, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (o-benzoyloxime)], ethanone, 1- [9-ethyl-6 -(2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (o-acetyloxime) Muesuteru compounds, etc. These can be used alone or in combinations of two or more.

<(D) Thermosetting compound>
The (D) thermosetting compound in the present invention is a compound that generates a crosslinked structure by heating and functions as a thermosetting agent. Examples include, but are not limited to, epoxy resins, isocyanate compounds, block isocyanate compounds, oxetane compounds, and the like. The said thermosetting compound can be used individually or in combination of 2 or more types. Among these, it is preferable to use an epoxy resin and a blocked isocyanate compound. By containing a thermosetting compound, heat resistance can be imparted to a cured film obtained by curing the photosensitive resin composition, and adhesion to a conductor such as a metal foil or a circuit board can be imparted.

  The epoxy resin is a compound containing at least two epoxy groups in the molecule. For example, as a bisphenol A type epoxy resin, product names jER828, jER1001, jER1002, and ADEKA manufactured by Japan Epoxy Resin Co., Ltd. Adeka Resin EP-4100E, Adeka Resin EP-4300E, trade names RE-310S and RE-410S manufactured by Nippon Kayaku Co., Ltd., trade names Epicron 840S, Epicron 850S, Epicron 1050 and Epicron 7050 manufactured by Dainippon Ink, Inc. The product names Epototo YD-115, Epototo YD-127, Epototo YD-128, and bisphenol F type epoxy resins manufactured by Toto Kasei Co., Ltd. are trade names jER806 and jER8 manufactured by Japan Epoxy Resin Co. 7. Trade names Adeka Resin EP-4901E, Adeka Resin EP-4930, Adeka Resin EP-4950, manufactured by Adeka Co., Ltd., trade names RE-303S, RE-304S, RE-403S, RE-404S, manufactured by Nippon Kayaku Co., Ltd. Product names Epicron 830 and Epicron 835 manufactured by Nippon Ink Co., Ltd. Product names Epototo YDF-170, Epototo YDF-175S, Epototo YDF-2001, and Bisphenol S type epoxy resin manufactured by Toto Kasei Co., Ltd. Trade name Epiklon EXA-1514 manufactured by Japan, Hydrogenated bisphenol A type epoxy resin includes Japan Epoxy Resin Co., Ltd. trade names jERYX8000, jERYX8034, jERYL7170, ADEKA Co., Ltd. trade names Adeka Resin P-4080E, Dainippon Ink Co., Ltd. trade name Epicron EXA-7015, Toto Kasei Co., Ltd. trade name Epototo YD-3000, Epototo YD-4000D, biphenyl type epoxy resin, manufactured by Japan Epoxy Resin Co., Ltd. Trade names jERYX4000, jERYL6121H, jERYL6640, jERYL6677, trade names NC-3000 and NC-3000H manufactured by Nippon Kayaku Co., Ltd., and phenoxy type epoxy resins include trade names jER1256, jER4250, jER4275 and naphthalene manufactured by Japan Epoxy Resins As the type epoxy resin, trade names “Epicron HP-4032”, “Epicron HP-4700”, “Epicron HP-4200” manufactured by Dainippon Ink Co., Ltd., “NC-” manufactured by Nippon Kayaku Co., Ltd. As 7000L, phenol novolac type epoxy resin, trade names jER152 and jER154 manufactured by Japan Epoxy Resin Co., Ltd., trade name EPPN-201-L manufactured by Nippon Kayaku Co., Ltd., trade name Epicron N- manufactured by Dainippon Ink Co., Ltd. 740, Epicron N-770, Toto Kasei Co., Ltd. trade name Epototo YDPN-638, Cresol novolac type epoxy resin, Nippon Kayaku Co., Ltd. trade names EOCN-1020, EOCN-102S, EOCN-103S, EOCN -104S, trade names manufactured by Dainippon Ink Co., Ltd. Epicron N-660, Epicron N-670, Epicron N-680, Epicron N-695, and Trisphenolmethane type epoxy resin are trade names of Nippon Kayaku Co., Ltd. EPPN-501H, EPP -501HY, EPPN-502H, dicyclopentadiene type epoxy resin, Nippon Kayaku Co., Ltd. trade name XD-1000, Dainippon Ink Co., Ltd. trade name Epicron HP-7200, amine type epoxy resin, Toto Kasei Co., Ltd. trade names Epototo YH-434, Epototo YH-434L, and flexible epoxy resins include trade names jER871, jER872, jERYL7175, jERYL7217, manufactured by Dainippon Ink, Inc. As the name Epicron EXA-4850, urethane-modified epoxy resin, trade names of Adeka Resin EPU-6, Adeka Resin EPU-73, Adeka Resin EPU-78-11 manufactured by ADEKA Corporation, and ADE Co., Ltd. as ADE Co., Ltd. Product names Adeka Resin EPR-4023, Adeka Resin EPR-4026, Adeka Resin EPR-1309, and chelate-modified epoxy resins manufactured by A include Adeka Resin EP-49-10, Adeka Resin EP-49-20, etc., manufactured by ADEKA Corporation. It is done.

  The blocked isocyanate compound is a compound that is inactive at room temperature, and is heated to dissociate a blocking agent such as oximes, diketones, phenols, caprolactams, and regenerate isocyanate groups. As the hexamethylene diisocyanate block isocyanate, trade names Duranate 17B-60PX, Duranate TPA-B80E, Duranate MF-B60X, Duranate MF-K60X, Duranate E402-B80T manufactured by Asahi Kasei Chemicals Co., Ltd. Name Takenate B-830, Takenate B-815N, Takenate B-846N, Takenate B-882N, trade names of Nippon Polyurethane Industry Co., Ltd. Coronate AP-M, Coronate 2503, Co Sulfonates 2507, Coronate 2513, Coronate 2515, include Millionate MS-50 and the like.

  Although it does not specifically limit as a hardening | curing agent of the said thermosetting compound in the photosensitive resin composition of this invention, For example, phenol resins, such as a phenol novolak resin, a cresol novolak resin, a naphthalene type phenol resin, an amino resin, and a urea resin , Melamine, dicyandiamide and the like, and these can be used alone or in combination of two or more.

  Further, the curing accelerator is not particularly limited, but for example, phosphine compounds such as triphenylphosphine; amine compounds such as tertiary amine, trimethanolamine, triethanolamine and tetraethanolamine; 1,8- Borate compounds such as diaza-bicyclo [5,4,0] -7-undecenium tetraphenylborate, imidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-un Imidazoles such as decylimidazole, 1-benzyl-2-methylimidazole, 2-heptadecylimidazole, 2-isopropylimidazole, 2,4-dimethylimidazole, 2-phenyl-4-methylimidazole; 2-methylimidazoline, 2- Ethyl imidazoline, 2 Imidazolines such as isopropylimidazoline, 2-phenylimidazoline, 2-undecylimidazoline, 2,4-dimethylimidazoline, 2-phenyl-4-methylimidazoline; 2,4-diamino-6- [2′-methylimidazolyl- ( 1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2′-undecylimidazolyl- (1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2 ′ Examples include azine-based imidazoles such as -ethyl-4'-methylimidazolyl- (1 ')]-ethyl-s-triazine, and these can be used alone or in combination of two or more.

<Photosensitive resin composition>
The blending amount of the component (A), the component (B), the component (C), and the component (D) in the photosensitive resin composition of the present invention is preferably (B) with respect to 100 parts by weight of the component (A). The component is 5 to 500 parts by weight, the component (C) is 0.1 to 20 parts by weight, and the component (D) is 0.5 to 100 parts by weight.

  By mix | blending in the said range, the photosensitivity of the photosensitive resin composition, the heat resistance of a cured film, chemical resistance, a softness | flexibility, and electrical insulation reliability improve.

  When the component (A) has a blending amount within the above range, the photosensitivity of the photosensitive resin composition, the solubility in an aqueous developer typified by an alkaline aqueous solution is lowered, and the heat resistance and flexibility of the cured film are reduced. , Chemical resistance, and electrical insulation reliability may be reduced. In addition, when the blending amount is in the above range or more, when the photosensitive resin composition is applied onto a substrate such as a printed wiring board and dried, stickiness of the coating film after drying occurs, Contamination and cracking of the coating film may occur. Therefore, by setting the addition amount within the above range, it becomes possible to adjust various characteristics of the photosensitive resin composition to an optimal range.

  When the blending amount of the component (B) is not more than the above range, it may be difficult to obtain contrast when the photosensitive resin composition is exposed and developed. Moreover, in the case of the compounding quantity more than the said range, the coating film after exposure of the photosensitive resin composition will become weak, and a crack may generate | occur | produce. Therefore, by making the addition amount within the above range, it becomes possible to adjust the resolution and the suitability of the production process of the photosensitive resin composition to an optimum range.

  When the amount of component (C) is not more than the above range, the curing reaction of the photosensitive compound during light irradiation hardly occurs and curing may be insufficient. Moreover, in the case of the compounding quantity more than the said range, the hardening reaction of the photosensitive compound at the time of light irradiation may progress too much and may be in an overexposed state. Therefore, it becomes possible to advance the photocuring reaction of the photosensitive resin composition efficiently by making the addition amount within the above range.

  When the component (D) has a blending amount not more than the above range, the heat resistance, flexibility, chemical resistance and electrical insulation reliability of the cured film of the photosensitive resin composition may be lowered. In addition, when the blending amount is in the above range or more, when the photosensitive resin composition is applied onto a substrate such as a printed wiring board and dried, the thermosetting reaction is accelerated during drying, and is typically represented by an alkaline aqueous solution. In some cases, the solubility in an aqueous developer is reduced. Therefore, by making the addition amount within the above range, the thermosetting reaction of the photosensitive resin composition is controlled and the heat resistance, chemical resistance and electrical insulation reliability of the cured film of the photosensitive resin composition are improved. Is possible.

  In the photosensitive resin composition of the present invention, an inorganic filler can be used for the purpose of improving the adhesion and the hardness of the cured film. The inorganic filler is not particularly limited, and examples thereof include barium sulfate, barium titanate, talc, ultrafine anhydrous silica, synthetic silica, natural silica, calcium carbonate, magnesium carbonate, aluminum oxide, aluminum hydroxide and the like. These can be used alone or in combination of two or more.

  In the photosensitive resin composition of the present invention, additives such as an antifoaming agent, a leveling agent, a flame retardant, a colorant, an adhesion imparting agent, and a polymerization inhibitor can be used as necessary. These additives are not particularly limited. For example, as an antifoaming agent, a silicon compound, an acrylic compound, as a leveling agent, a silicon compound, an acrylic compound, and as a flame retardant, a phosphate ester Compounds, phosphazene compounds, colorants include phthalocyanine compounds, azo compounds, carbon black, titanium oxide, and adhesion promoters include silane coupling agents, triazole compounds, tetrazole compounds, triazine compounds, polymerization Examples of the inhibitor include hydroquinone and hydroquinone monomethyl ether, and these can be used alone or in combination of two or more.

  The photosensitive resin composition of the present invention is highly soluble in various organic solvents, such as sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, and formamide systems such as N, N-dimethylformamide and N, N-diethylformamide. Solvents, acetamide solvents such as N, N-dimethylacetamide, N, N-diethylacetamide, pyrrolidone solvents such as N-methyl-2-pyrrolidone and N-vinyl-2-pyrrolidone, phenol, o-, m- or Phenolic solvents such as p-cresol, xylenol, halogenated phenol, catechol, or hexamethylphosphoramide, γ-butyrolactone, methylmonoglyme (1,2-dimethoxyethane), methyldiglyme (bis (2-methoxyether) ) Ether), Methyl Trigura (1,2-bis (2-methoxyethoxy) ethane), methyltetraglyme (bis [2- (2-methoxyethoxyethyl)] ether), ethyl monoglyme (1,2-diethoxyethane), ethyldigig Symmetric glycol diethers such as lime (bis (2-ethoxyethyl) ether), butyldiglyme (bis (2-butoxyethyl) ether), γ-butyrolactone, N-methyl-2-pyrrolidone, methyl acetate, ethyl acetate , Isopropyl acetate, n-propyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate (also known as carbitol acetate, 2- (2-butoxyethoxy) ethyl acetate)) Acetates such as diethylene glycol monobutyl ether acetate, 3-methoxybutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, propylene glycol diacetate, 1,3-butylene glycol diacetate, Dipropylene glycol methyl ether, tripropylene glycol methyl ether, propylene glycol n-propyl ether, dipropylene glycol n-propyl ether, propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripylene glycol n-propyl ether, propylene glycol Phenyl ether, dipropylene glycol Methyl ether, 1,3-dioxolane, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, a solvent may be used ethers such as ethylene glycol monoethyl ether. If necessary, low-boiling hexane, acetone, toluene, xylene and the like can be used in combination.

  Among these, symmetric glycol diethers are particularly preferable because the solubility of the photosensitive resin composition is high.

  The amount of the organic solvent used in the photosensitive resin composition solution of the present invention is preferably 100 parts by weight of the total solid content of the component (A), the component (B), the component (C), and the component (D). The organic solvent is 10 parts by weight or more and 100 parts by weight or less.

  By adjusting the solid content of the photosensitive resin composition solution within the above range, the viscosity of the photosensitive resin composition can be controlled within the optimum range when coating, and the film thickness after coating and drying is reduced. The rate is reduced.

  The photosensitive resin composition of the present invention is obtained by uniformly mixing the components (A) to (D). As a method of uniformly mixing, for example, a general kneading apparatus such as a three roll or bead mill apparatus may be used for mixing. Moreover, when the viscosity of a solution is low, you may mix using a general stirring apparatus.

  After preparing the photosensitive resin composition of the present invention directly or after preparing the photosensitive resin composition solution, a pattern can be formed as follows. First, the photosensitive resin composition is applied onto a substrate and dried to remove the organic solvent. The substrate can be applied by screen printing, roller coating, curtain coating, spray coating, spin coating using a spinner, or the like. The coating film (preferably having a thickness of 5 to 100 μm) is dried at 120 ° C. or less, preferably 40 to 100 ° C. After drying, a negative photomask is placed on the dried coating film and irradiated with actinic rays such as ultraviolet rays, visible rays, and electron beams. Next, the pattern can be obtained by washing the unexposed portion with a developing solution using various methods such as shower, paddle, dipping or ultrasonic waves. Since the time until the pattern is exposed varies depending on the spray pressure and flow velocity of the developing device and the temperature of the developer, it is preferable to find the optimum device conditions as appropriate.

  As the developer, an aqueous alkali solution is preferably used. The developer is water-soluble such as methanol, ethanol, n-propanol, isopropanol, N-methyl-2-pyrrolidone and the like. An organic solvent may be contained. Examples of the alkaline compound that gives the alkaline aqueous solution include hydroxides, carbonates, hydrogen carbonates, amine compounds, and the like of alkali metals, alkaline earth metals, or ammonium ions, specifically sodium hydroxide. , Potassium hydroxide, ammonium hydroxide, sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetraisopropylammonium Hydroxide, N-methyldiethanolamine, N-ethyldiethanolamine, N, N-dimethylethanolamine, triethanolamine, triisopropanolamine, trii Propylamine and the like, aqueous solution compound other than this as long as it exhibits basicity can also be used. The concentration of the alkaline compound that can be suitably used in the development step of the photosensitive resin composition of the present invention is preferably 0.01 to 10% by weight, particularly preferably 0.05 to 5% by weight. Further, the temperature of the developer depends on the composition of the photosensitive resin composition and the composition of the developer, and is generally 0 ° C. or higher and 80 ° C. or lower, more generally 20 ° C. or higher and 50 ° C. or lower. It is preferable to use it.

  The pattern formed by the development step is rinsed to remove unnecessary developer residue. Examples of the rinsing liquid include water and acidic aqueous solutions.

  Next, a cured film rich in heat resistance can be obtained by performing a heat curing treatment. Although a cured film is determined in consideration of wiring thickness etc., it is preferable that thickness is about 2-50 micrometers. The final curing temperature at this time is desired to be cured by heating at a low temperature for the purpose of preventing oxidation of the wiring and the like and not reducing the adhesion between the wiring and the substrate. The heat curing temperature at this time is preferably 100 ° C. or higher and 250 ° C. or lower, more preferably 120 ° C. or higher and 200 ° C. or lower, and particularly preferably 130 ° C. or higher and 190 ° C. or lower. When the final heating temperature becomes high, the wiring may be oxidized and deteriorated.

  A pattern comprising a cured film formed from the photosensitive resin composition of the present invention is excellent in heat resistance, electrical and mechanical properties, and is particularly excellent in flexibility. For example, the insulating film of the present invention preferably has a thickness of about 2 to 50 μm and a resolution of at least 10 μm after photocuring, and particularly a resolution of about 10 to 1000 μm. For this reason, the insulating film of the present invention is particularly suitable as an insulating material for a high-density flexible substrate. Furthermore, it is used for various photo-curing type wiring coating protective agents, photosensitive heat-resistant adhesives, electric wire / cable insulation coatings, and the like.

  In addition, this invention can provide the same insulating material even if it uses the photosensitive film obtained by apply | coating the said liquid for photosensitive resin compositions to the base-material surface, and drying.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

(Synthesis Example 1)
In a reaction vessel, 14.58 g (0.028 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 3.42 g (0.056 mol) of 2-aminoethanol, The mixture was charged into 72 g of 2-bis (2-methoxyethoxy) ethane, heated to 130 ° C. under a nitrogen stream, and stirred uniformly for 1 hour. Next, the temperature was raised to 180 ° C. and heated under reflux for 2 hours to carry out an imidization reaction. The solution was cooled to room temperature, and polycarbonate diol (manufactured by Asahi Kasei Chemicals Corporation, trade name: PCDL T5651, number average molecular weight: 1000) 85 g (0.085 mol), 2,2-bis (hydroxymethyl) butanoic acid 20 g (0. 135 mol), 61.87 g (0.300 mol) of norbornene diisocyanate, 0.182 g of dibutyltin dilaurate, and 49.55 g of 1,2-bis (2-methoxyethoxy) ethane, and heated to 80 ° C. under a nitrogen stream. For 5 hours. This solution was cooled to room temperature, charged with 16.36 g (0.115 mol) of glycidyl methacrylate, 0.547 g of triphenylphosphine, and 0.182 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 16.81 g (0.110 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 16,200 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 64% by weight, and the viscosity of the solution was 320 poise at 23 ° C. This synthetic resin is abbreviated as resin A.

(Synthesis Example 2)
In a reaction vessel, 8.69 g (0.028 mol) of 3,3 ′, 4,4′-oxydiphthalic dianhydride and 3.42 g (0.056 mol) of 2-aminoethanol were mixed with 1,2-bis (2-methoxyethoxy). ) It was charged in 72 g of ethane, heated to 130 ° C. under a nitrogen stream, and stirred uniformly for 1 hour. Next, the temperature was raised to 180 ° C. and heated under reflux for 2 hours to carry out an imidization reaction. The solution was cooled to room temperature, and polycarbonate diol (manufactured by Asahi Kasei Chemicals Corporation, trade name: PCDL T5651, number average molecular weight: 1000) 85 g (0.085 mol), 2,2-bis (hydroxymethyl) butanoic acid 20 g (0. 135 mol), 61.87 g (0.300 mol) of norbornene diisocyanate, 0.182 g of dibutyltin dilaurate, and 49.55 g of 1,2-bis (2-methoxyethoxy) ethane, and heated to 80 ° C. under a nitrogen stream. For 5 hours. This solution was cooled to room temperature, charged with 16.36 g (0.115 mol) of glycidyl methacrylate, 0.547 g of triphenylphosphine, and 0.182 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 16.81 g (0.110 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. Thus, a polyimide resin solution (number average molecular weight was 15400 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 63 wt%, and the viscosity of the solution was 280 poise at 23 ° C. This synthetic resin is abbreviated as resin B.

(Synthesis Example 3)
In a reaction vessel, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride 40.42 g (0.078 mol), 1,3-bis (3-aminophenoxy) benzene 11.35 g (0.039 mol) and 4.75 g (0.078 mol) of 2-aminoethanol were added to 102 g of 1,2-bis (2-methoxyethoxy) ethane, and the temperature was raised to 130 ° C. under a nitrogen stream and uniform for 1 hour. Stirring was performed. Next, the temperature was raised to 180 ° C. and heated under reflux for 2 hours to carry out an imidization reaction. The solution was cooled to room temperature, and polycarbonate diol (manufactured by Asahi Kasei Chemicals Corporation, trade name: PCDL T5651, number average molecular weight: 1000) 85 g (0.085 mol), 2,2-bis (hydroxymethyl) butanoic acid 20 g (0. 135 mol), 61.87 g (0.300 mol) of norbornene diisocyanate, 0.182 g of dibutyltin dilaurate, and 49.55 g of 1,2-bis (2-methoxyethoxy) ethane, and heated to 80 ° C. under a nitrogen stream. For 5 hours. This solution was cooled to room temperature, charged with 16.36 g (0.115 mol) of glycidyl methacrylate, 0.547 g of triphenylphosphine, and 0.182 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 16.81 g (0.110 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 18700 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 63 wt%, and the viscosity of the solution was 340 poise at 23 ° C. This synthetic resin is abbreviated as resin C.

(Synthesis Example 4)
In a reaction vessel, 14.58 g (0.028 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 3.42 g (0.056 mol) of 2-aminoethanol, The mixture was charged into 72 g of 2-bis (2-methoxyethoxy) ethane, heated to 130 ° C. under a nitrogen stream, and stirred uniformly for 1 hour. Next, the temperature was raised to 180 ° C. and heated under reflux for 2 hours to carry out an imidization reaction. This solution was cooled to room temperature, polycarbonate diol (Asahi Kasei Chemicals Corporation, trade name PCDL T5651, number average molecular weight: 1000) 42.5 g (0.0425 mol), polyoxyalkylene diol (Asahi Kasei Fibers Corporation, trade name) PTXG1000, number average molecular weight: 1000) 42.5 g (0.0425 mol), 2,2-bis (hydroxymethyl) butanoic acid 20 g (0.135 mol), norbornene diisocyanate 61.87 g (0.300 mol), dibutyltin dilaurate 0 .182 g and 49.55 g of 1,2-bis (2-methoxyethoxy) ethane were added, the temperature was raised to 80 ° C. under a nitrogen stream, and a homogeneous reaction was performed for 5 hours. This solution was cooled to room temperature, charged with 16.36 g (0.115 mol) of glycidyl methacrylate, 0.547 g of triphenylphosphine, and 0.182 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 16.81 g (0.110 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 16,200 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 64% by weight, and the viscosity of the solution was 280 poise at 23 ° C. This synthetic resin is abbreviated as resin D.

(Synthesis Example 5)
In a reaction vessel, 14.58 g (0.028 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 3.42 g (0.056 mol) of 2-aminoethanol, The mixture was charged into 72 g of 2-bis (2-methoxyethoxy) ethane, heated to 130 ° C. under a nitrogen stream, and stirred uniformly for 1 hour. Next, the temperature was raised to 180 ° C. and heated under reflux for 2 hours to carry out an imidization reaction. The solution was cooled to room temperature, and polycarbonate diol (manufactured by Asahi Kasei Chemicals Corporation, trade name: PCDL T5651, number average molecular weight: 1000) 85 g (0.085 mol), 2,2-bis (hydroxymethyl) butanoic acid 20 g (0. 135 mol), 61.87 g (0.300 mol) of norbornene diisocyanate, 0.182 g of dibutyltin dilaurate, and 49.55 g of 1,2-bis (2-methoxyethoxy) ethane, and heated to 80 ° C. under a nitrogen stream. For 5 hours. This solution was cooled to room temperature, and 3,4-epoxycyclohexylmethyl methacrylate (Daicel Chemical Industries, Ltd., trade name Cyclomer M100) 22.55 g (0.115 mol), triphenylphosphine 0.547 g, hydroquinone monomethyl ether 0 .182 g was added, and the mixture was heated to 100 ° C. under an air stream and stirred uniformly for 5 hours. The solution was cooled to room temperature, charged with 16.81 g (0.110 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. Thus, a polyimide resin solution (number average molecular weight was 16600 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 64% by weight, and the viscosity of the solution was 340 poise at 23 ° C. This synthetic resin is abbreviated as Resin E.

(Synthesis Example 6)
Polycarbonate diol (trade name: PCDL T5652; number-average molecular weight: 2000, manufactured by Asahi Kasei Chemicals Corporation) 80 g (0.040 mol), 2,2-bis (hydroxymethyl) butanoic acid 11.85 g (0.080 mol), Charge 33 g (0.160 mol) of norbornene diisocyanate, 0.125 g of dibutyltin dilaurate and 31.21 g of 1,2-bis (2-methoxyethoxy) ethane, raise the temperature to 80 ° C. under a nitrogen stream, and react uniformly for 2 hours. Went. The solution was cooled to room temperature, 41.64 g (0.080 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 1,2-bis (2-methoxyethoxy). ) 79.79 g of ethane was added and the mixture was heated to 180 ° C. under a nitrogen stream and stirred uniformly for 3 hours. The solution was cooled to room temperature, charged with 9.10 g (0.064 mol) of glycidyl methacrylate, 0.528 g of triphenylphosphine, and 0.176 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 9.13 g (0.060 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 18200 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 61% by weight, and the viscosity of the solution was 380 poise at 23 ° C. This synthetic resin is abbreviated as resin F.

(Synthesis Example 7)
Polycarbonate diol (trade name: PCDL T5652; number-average molecular weight: 2000, manufactured by Asahi Kasei Chemicals Corporation) 80 g (0.040 mol), 2,2-bis (hydroxymethyl) butanoic acid 11.85 g (0.080 mol), Charge 33 g (0.160 mol) of norbornene diisocyanate, 0.125 g of dibutyltin dilaurate and 31.21 g of 1,2-bis (2-methoxyethoxy) ethane, raise the temperature to 80 ° C. under a nitrogen stream, and react uniformly for 2 hours. Went. The solution was cooled to room temperature and charged with 24.83 g (0.080 mol) of 3,3 ′, 4,4′-oxydiphthalic dianhydride and 58.72 g of 1,2-bis (2-methoxyethoxy) ethane. The mixture was heated to 180 ° C. under a nitrogen stream and stirred uniformly for 3 hours. The solution was cooled to room temperature, charged with 9.10 g (0.064 mol) of glycidyl methacrylate, 0.528 g of triphenylphosphine, and 0.176 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 9.13 g (0.060 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 17600 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 60% by weight, and the viscosity of the solution was 320 poise at 23 ° C. This synthetic resin is abbreviated as resin G.

(Synthesis Example 8)
Polycarbonate diol (trade name: PCDL T5652; number-average molecular weight: 2000, manufactured by Asahi Kasei Chemicals Corporation) 80 g (0.040 mol), 2,2-bis (hydroxymethyl) butanoic acid 11.85 g (0.080 mol), Charge 33 g (0.160 mol) of norbornene diisocyanate, 0.125 g of dibutyltin dilaurate and 31.21 g of 1,2-bis (2-methoxyethoxy) ethane, raise the temperature to 80 ° C. under a nitrogen stream, and react uniformly for 2 hours. Went. The solution was cooled to room temperature, 83.28 g (0.160 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 1,2-bis (2-methoxyethoxy). ) 113.29 g of ethane was added, and the mixture was heated to 180 ° C. under a nitrogen stream and stirred uniformly for 3 hours. The solution was cooled to room temperature, charged with 23.39 g (0.080 mol) of 1,3-bis (3-aminophenoxy) benzene, heated to 180 ° C. under a nitrogen stream, and uniformly stirred for 2 hours. . The solution was cooled to room temperature, charged with 9.10 g (0.064 mol) of glycidyl methacrylate, 0.528 g of triphenylphosphine, and 0.176 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 9.13 g (0.060 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 22100 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 60% by weight, and the viscosity of the solution was 430 poise at 23 ° C. This synthetic resin is abbreviated as resin H.

(Synthesis Example 9)
Polycarbonate diol (made by Asahi Kasei Chemicals Corporation, trade name PCDL T5652, number average molecular weight: 2000) 40 g (0.020 mol), polyoxyalkylene diol (made by Asahi Kasei Fibers Corporation, trade name PTXG1800, number average molecular weight: 1800) ) 36 g (0.020 mol), 11,2-bis (hydroxymethyl) butanoic acid 11.85 g (0.080 mol), norbornene diisocyanate 33 g (0.160 mol), dibutyltin dilaurate 0.125 g, 1,2-bis ( 2-Methoxyethoxy) ethane (31.21 g) was added, and the mixture was heated to 80 ° C. under a nitrogen stream to carry out a uniform reaction for 2 hours. The solution was cooled to room temperature, 41.64 g (0.080 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 1,2-bis (2-methoxyethoxy). ) 79.79 g of ethane was added and the mixture was heated to 180 ° C. under a nitrogen stream and stirred uniformly for 3 hours. The solution was cooled to room temperature, charged with 9.10 g (0.064 mol) of glycidyl methacrylate, 0.528 g of triphenylphosphine, and 0.176 g of hydroquinone monomethyl ether, heated to 100 ° C. under an air stream, and uniform for 5 hours. Stirring was performed. The solution was cooled to room temperature, charged with 9.13 g (0.060 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 17800 in terms of polyethylene glycol) was obtained. The solid concentration of this solution was 61% by weight, and the viscosity of the solution was 320 poise at 23 ° C. This synthetic resin is abbreviated as Resin I.

(Synthesis Example 10)
Polycarbonate diol (trade name: PCDL T5652; number-average molecular weight: 2000, manufactured by Asahi Kasei Chemicals Corporation) 80 g (0.040 mol), 2,2-bis (hydroxymethyl) butanoic acid 11.85 g (0.080 mol), Charge 33 g (0.160 mol) of norbornene diisocyanate, 0.125 g of dibutyltin dilaurate and 31.21 g of 1,2-bis (2-methoxyethoxy) ethane, raise the temperature to 80 ° C. under a nitrogen stream, and react uniformly for 2 hours. Went. The solution was cooled to room temperature, 41.64 g (0.080 mol) of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 1,2-bis (2-methoxyethoxy). ) 79.79 g of ethane was added and the mixture was heated to 180 ° C. under a nitrogen stream and stirred uniformly for 3 hours. The solution was cooled to room temperature, and 3,4-epoxycyclohexylmethyl methacrylate (manufactured by Daicel Chemical Industries, trade name Cyclomer M100), 12.55 g (0.064 mol), triphenylphosphine 0.528 g, hydroquinone monomethyl ether 0 .176 g was added, and the mixture was heated to 100 ° C. under an air stream and stirred uniformly for 5 hours. The solution was cooled to room temperature, charged with 9.13 g (0.060 mol) of tetrahydrophthalic anhydride, heated to 100 ° C. under an air stream, and stirred uniformly for 3 hours. In this way, a polyimide resin solution (number average molecular weight was 18400 in terms of polyethylene glycol) was obtained. The solid content concentration of this solution was 61% by weight, and the viscosity of the solution was 390 poise at 23 ° C. This synthetic resin is abbreviated as Resin J.

(Examples 1-12)
A photosensitive compound, a photopolymerization initiator, a thermosetting compound, and an organic solvent were added to the polyimide resins obtained in Synthesis Examples 1 to 10 to prepare a photosensitive resin composition. Tables 1 and 2 show the blending amount of each constituent raw material in the resin solid content and the kind of raw material. In addition, 1,2-bis (2-methoxyethoxy) ethane which is a solvent in the table is the total amount of solvent including the solvent and the like contained in the above synthetic resin solution and the like.

  The photosensitive resin composition was first mixed with a general stirring device equipped with a stirring blade, and the solution was passed twice with a three-roll mill to obtain a uniform solution. When the particle diameter was measured with a grindometer, all were 10 μm or less. The following evaluation was carried out by completely defoaming the foam in the solution with a defoaming device. The evaluation results are shown in Tables 3-5.

(Preparation of coating film on polyimide film)
The above photosensitive resin composition was cast and applied to an area of 100 mm × 100 mm on a 75 μm polyimide film (manufactured by Kaneka Corporation: trade name 75 NPI) using a Baker type applicator so that the final dry thickness was 25 μm. After drying at 80 ° C. for 20 minutes, a negative photomask having an area of 50 mm × 50 mm line width / space width = 100 μm / 100 μm was placed and exposed to UV light at 300 mJ / cm 2 under reduced pressure for exposure. This photosensitive film was spray-developed for 90 seconds at a discharge pressure of 1.0 kgf / mm 2 using a solution in which a 1.0 wt% sodium carbonate aqueous solution was kept at 30 ° C. After development, the film was thoroughly washed with pure water, and then dried by heating in an oven at 150 ° C. for 60 minutes to prepare a cured film of the photosensitive resin composition.

(Photosensitive)
The evaluation of the photosensitivity of the photosensitive resin composition was determined by observing the surface of the cured film obtained in the above item (Preparation of coating film on polyimide film).
◯: Clear line width / space width = 100/100 μm photosensitive pattern is drawn on the polyimide film surface, no line shaking occurs due to peeling of the line part, and there is no residual residue in the space part thing.
Δ: A clear photosensitive pattern having a line width / space width = 100/100 μm is drawn, and the line portion is shaken due to peeling, but there is no undissolved residue in the space portion.
×: Clear line width / space width = 100/100 μm photosensitive pattern is not drawn, and dissolution residue is generated in the space portion.

(Coating film adhesion)
The adhesive strength of the cured film of the photosensitive resin composition obtained in the above item (Preparation of coating film on polyimide film) was evaluated by a cross-cut tape method according to JIS K5400.
○: No peeling by cross-cut tape method.
Δ: 95% or more of the cells remain.
X: The remaining amount of the mesh is less than 80%.

(Solvent resistance)
The solvent resistance of the cured film of the photosensitive resin composition obtained in the above item (preparation of coating film on polyimide film) was evaluated. In the evaluation method, the film was dipped in methyl ethyl ketone at 25 ° C. for 15 minutes and then air-dried, and the state of the film surface was observed.
○: There is no abnormality in the coating film.
X: Abnormality such as swelling or peeling occurs in the coating film.

(Flexibility)
A cured film laminated film of a photosensitive resin composition was prepared on the surface of a 25 μm-thick polyimide film (Apical 25NPI manufactured by Kaneka Corporation) in the same manner as the above item (Preparation of a coating film on a polyimide film). The cured film laminated film was cut into a 30 mm × 10 mm strip, bent 10 times at 180 ° at 15 mm, and the coating film was visually confirmed to check for cracks.
○: The cured film has no cracks.
Δ: The cured film has some cracks.
X: The cured film has cracks.

(Warpage amount)
Using the Baker type applicator, the photosensitive resin composition was cast and applied to a 25 μm-thick polyimide film (Apical 25NPI manufactured by Kaneka Corporation) to an area of 100 mm × 100 mm so that the final dry thickness was 25 μm. Dry at 80 ° C. for 20 minutes. The entire surface was exposed to 300 mJ / cm 2 of ultraviolet light under reduced pressure. This photosensitive film was spray-developed at a discharge pressure of 1.0 kgf / mm 2 using a solution obtained by heating a 1.0 wt% sodium carbonate aqueous solution to 30 ° C. However, since the entire surface was exposed, no change in the film area was observed. After development, the film was thoroughly washed with pure water, and then dried by heating in an oven at 150 ° C. for 60 minutes to prepare a cured film of the photosensitive resin composition.

  The cured film was cut into a film having an area of 50 mm × 50 mm and placed on a smooth table so that the coating film was on the upper surface, and the warp height of the film edge was measured. A schematic diagram of the measurement site is shown in FIG. The smaller the amount of warpage on the polyimide film surface, the smaller the stress on the surface of the printed wiring board and the lower the amount of warping of the printed wiring board. The warp amount is preferably 5 mm or less.

(Solder heat resistance)
The photosensitive resin composition was cast and applied to an area of 100 mm × 100 mm on a 75 μm polyimide film (manufactured by Kaneka Corporation: trade name 75 NPI) using a Baker type applicator so that the final dry thickness was 25 μm. After drying at 80 ° C. for 20 minutes, a negative photomask having a line width / space width of 50 mm × 50 mm = 100 μm / 100 μm was placed and exposed to UV light at 300 mJ / cm 2 under reduced pressure for exposure. This photosensitive film was spray-developed at a discharge pressure of 1.0 kgf / mm 2 using a solution obtained by heating a 1.0 wt% sodium carbonate aqueous solution to 30 ° C. After development, the film was thoroughly washed with pure water, and then dried by heating in an oven at 150 ° C. for 60 minutes to prepare a cured film of the photosensitive resin composition.

The coated film was floated so that the surface coated with the cured film of the photosensitive resin composition was in contact with a solder bath completely dissolved at 260 ° C., and then pulled up 10 seconds later. The operation was performed three times, and the adhesive strength of the cured film was evaluated by a cross-cut tape method according to JIS K5400.
○: No peeling by cross-cut tape method.
Δ: 95% or more of the cells remain.
X: The remaining amount of the mesh is less than 80%.

(Insulation reliability)
A comb-shaped pattern of line width / space width = 100 μm / 100 μm on a flexible copper-laminated laminate (copper foil thickness 12 μm, polyimide film is Apical 25 NPI manufactured by Kaneka Corporation, and copper foil is bonded with a polyimide adhesive) After being prepared and immersed in a 10% by volume sulfuric acid aqueous solution for 1 minute, the surface of the copper foil was treated by washing with pure water. Then, the cured film of the photosensitive resin composition was produced on the comb pattern by the method similar to the production method of the cured film on a polyimide film, and the test piece was adjusted. A 100 V direct current was applied to both terminals of the test piece in an environmental test machine at 85 ° C. and 85% RH, and changes in the insulation resistance value and occurrence of migration were observed.
◯: A resistance value of 10 9 or more after 1000 hours from the start of the test and no occurrence of migration, dendrite, copper discoloration, etc.
X: The occurrence of migration, dendrite, discoloration of copper, etc. in 1000 hours or more after starting the test.

(Wettability)
A cured film laminated film of a photosensitive resin composition was prepared on the surface of a 25 μm-thick polyimide film (Apical 25NPI manufactured by Kaneka Corporation) in the same manner as the above item (Preparation of a coating film on a polyimide film). Using this cured film, the wettability of the coating film surface was evaluated according to JIS K6768. The better the wettability of the cured coating film surface, the higher the value of the wetting index and the better the adhesion with the sealant resin. The wetting index is preferably 36 or more.

(Comparative Example 1)
In a reaction vessel, 2,3,3 ′, 4′-biphenyltetracarboxylic dianhydride 25.06 g (0.085 mol), N-methyl-2-pyrrolidone 108 g, hydroquinone 1.20 g, 4-methoxyhydroquinone 1.20 g And cooled with dry ice / methanol (−30 ° C.) while passing dry air, 6.00 g (0.023 mol) of ethyl ethyl 3,5-diaminobenzoate, diaminopolysiloxane (Shin-Etsu Chemical) 54.0 g (0.062 mol) manufactured by Co., Ltd., trade name KF-8010) was added over 5 minutes, and the apparatus and the instrument were washed with 40 g of N-methyl-2-pyrrolidone. The outside was cooled and stirred uniformly at 25 ° C. for 30 hours to obtain a polyamic acid solution. Next, 472 g of N-methyl-2-pyrrolidone was added to dilute the reaction solution, and 145.2 g of acetic anhydride and 62.2 g of pyridine were added at 25 ° C. over 10 minutes while cooling the outside. Subsequently, the imidization reaction was performed by stirring overnight at 20 ° C. The obtained imide resin solution was deposited in a 3 liter container containing 1.5 liters of methanol over 2 minutes using a disperser. The precipitate was collected using a filter paper (No. 3 Advantech) and washed with a small amount of methanol. After this operation was repeated three times, the filtrated product was vacuum dried (25 ° C., 15 hours) to obtain 85.5 g of a photosensitive polyimidesiloxane resin.

  After dissolving 30 g of the above photosensitive polyimidesiloxane resin in 45 g of N-methyl-2-pyrrolidone, 5.25 g of Aerosil (average particle size: about 0.02 μm), 12 g of talc (average particle size: 1.5 μm), 1 6.92 g of -hydroxy-cyclohexyl phenyl ketone and 6.92 g of 2-benzyl-1,2-dimethylamino-1- (4-morpholinophenyl) butane-1 were added and stirred. This mixture was kneaded with three rolls to obtain a photosensitive resin composition solution. The obtained photosensitive resin composition solution was subjected to the same evaluation as in Examples 1 to 12 by completely defoaming bubbles in the solution with a defoaming apparatus. The evaluation results are shown in Table 5.

  The obtained cured film was poor in solvent resistance, and the wetting index on the surface of the cured coating film was very low. Furthermore, it was insoluble in the dilute alkaline aqueous solution of the developer during development.

(Comparative Example 2)
After introducing air into the reaction vessel, polycarbonate diol (manufactured by Daicel Chemical Industries, trade name: Plaxel CD205PL, number average molecular weight: 500) 196.8 g (0.394 mol), 2,2-bis (hydroxymethyl) butane Acid 58.3 (0.394 mol) g, diethylene glycol 37.6 g (0.353 mol), 1,4-cyclohexanedimethanol monoacrylate 148.1 (0.748 mol) g, p-methoxyphenol 0.55 g, dibutyltin 0.55 g of dilaurate and 110.2 g of methyl ethyl ketone were charged, and the temperature was raised to 65 ° C. with uniform stirring under an air stream. 305.9 g (1.457 mol) of trimethylhexamethylene diisocyanate was charged into the dropping vessel and dropped into the reaction vessel over 3 hours with uniform stirring at 65 ° C. After the completion of dropping, the dropping container was washed with 76.5 g of methyl ethyl ketone, and the washed solution was put into the reaction container as it was. Further, the mixture was kept warm for 2 hours with uniform stirring, then heated to 75 ° C. and stirred uniformly for 5 hours. Next, 9.3 g of methanol was added to the reaction vessel, and uniform stirring was performed at 60 ° C. for 30 minutes. Thereafter, 56.4 g of methyl ethyl ketone was added to obtain a transparent resin solution. This resin solution had a solid concentration of 75% by weight and a viscosity of 20 poise at 23 ° C.

  To 50 g of the resin solution, 0.25 g of 2,2-dimethoxy-2-phenylacetone was added and stirred. This mixture was kneaded with three rolls to obtain a photosensitive resin composition solution. The obtained photosensitive resin composition solution was subjected to the same evaluation as in Examples 1 to 12 by completely defoaming bubbles in the solution with a defoaming apparatus. The evaluation results are shown in Table 5.

  The cured film obtained had poor solvent resistance and solder heat resistance, and the copper circuit was discolored black after the insulation reliability test.

(Comparative Example 3)
62.5 g of resin solution obtained in Comparative Example 1 (solid content 50 g), 30 g of 2,2′-bis (4-methacryloxypentaethoxyphenyl) propane, methacrylic acid / methyl methacrylate / butyl acrylate = 22/71 / 16 (weight ratio) copolymer dissolved in methyl cellosolve / toluene = 6/4 (weight ratio) solution to a solid content of 40% by weight (solid content: 65 g), benzophenone 5 g, 0.1 g of N, N′-tetraethyl-4,4′-diaminobenzophenone, blocked isocyanate compound (manufactured by Asahi Kasei Chemicals Corporation, trade name Duranate TPA-B80E, solid content 80% by weight) 18.75 g (solid content 15 g) ), Phosphoric ester-based flame retardant (trade name CR-747, manufactured by Daihachi Chemical Industry Co., Ltd.) 40 g and acetone 85 g were added and stirred. It was. This mixture was kneaded with three rolls to obtain a photosensitive resin composition solution. The obtained photosensitive resin composition solution was subjected to the same evaluation as in Examples 1 to 12 by completely defoaming bubbles in the solution with a defoaming apparatus. The evaluation results are shown in Table 5.
The resistance value after the insulation reliability test was 10 9 or less, the surface of the coating film became sticky due to the bleed-out of the flame retardant, migration occurred, and the copper circuit turned black.

(Comparative Example 4)
40.68 g of ethyl diglycol acetate, 22.20 g (0.1 mol) of isophorone diisocyanate, and 8.88 g (0.06 mol) of 2,2-bis (hydroxymethyl) butanoic acid are put into a reaction vessel, and the mixture is stirred under a nitrogen stream. The temperature was raised to 0 ° C. and uniform stirring was performed for 3 hours. Next, 9.60 g (0.05 mol) of trimellitic anhydride was added, the temperature was raised to 160 ° C., and the mixture was heated to reflux for 4 hours to carry out an imidization reaction. Next, 7.10 g (0.05 mol) of glycidyl methacrylate was added, and stirred uniformly at 100 ° C. for 5 hours to obtain an imide-urethane acrylate. Further, 6.84 g (0.045 mol) of tetrahydrophthalic anhydride was charged and stirred uniformly at 100 ° C. for 5 hours. The resulting resin solution had a solid content concentration of 56% by weight and a number average molecular weight of 5,500 in terms of polyethylene glycol.
133.93 g of the above resin solution (solid content: 75 g), 25 g of cresol novolac type epoxy resin (trade name EOCN-104S, manufactured by Nippon Kayaku Co., Ltd.), 10 g of dipentaerythritol hexaacrylate, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholinopropan-1-one (5 g) and N, N-dimethylbenzylamine (1 g) were added and stirred. This mixture was kneaded with three rolls to obtain a photosensitive resin composition solution. The obtained photosensitive resin composition solution was subjected to the same evaluation as in Examples 1 to 12 by completely defoaming bubbles in the solution with a defoaming apparatus. The evaluation results are shown in Table 5.
The obtained cured film was poor in flexibility, and in the bendability test, a crack was generated by one folding. Furthermore, the amount of warping of the test piece after curing showed a value of 20 mm or more.

* 1: Shin-Nakamura Chemical Co., Ltd., trade name: NK ester BPE-500 (ethoxylated bisphenol A dimethacrylate, EO = 10)
* 2: Product name KAYARAD ZFR-1401H (polybasic acid anhydride-modified epoxy acrylate resin) manufactured by Nippon Kayaku Co., Ltd.
* 3: 2-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1 manufactured by Ciba Specialty Chemicals
* 4: Japan Epoxy Resin Co., Ltd., bisphenol A type epoxy resin * 5: Asahi Kasei Chemicals Co., Ltd., trade name Duranate TPA-B80E (hexamethylene diisocyanate block isocyanate compound)
* 6: Nippon Aerosil Co., Ltd., ultrafine anhydrous silica

Schematic diagram measuring the amount of warping of the film

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polyimide film which laminated the photosensitive resin composition 2 Warpage amount 3 Smooth stand

Claims (19)

(A) a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developable group and a photosensitive group in the side chain; (B) having at least one photosensitive group in the molecule; A polyimide compound that is not a polyimide resin having an imide skeleton, a polycarbonate skeleton, and a urethane bond in the main chain, and a developing group and a photosensitive group in the side chain,
A photosensitive resin composition comprising (C) a photopolymerization initiator and (D) a thermosetting compound.   The photosensitive resin composition according to claim 1, wherein the imide skeleton of the (A) polyimide resin is an etherimide skeleton.   3. The photosensitive resin composition according to claim 1, wherein the developing group and the photosensitive group of the side chain have at least a structure in which both are bonded to one side chain branched from the main chain. .   The developing group of the (A) polyimide resin is a carboxyl group, and the photosensitive group of the (A) polyimide resin and (B) the photosensitive compound is a (meth) acryloyl group. The photosensitive resin composition of any one of these. The (A) polyimide resin is at least (a1) a hydroxyl-terminated etherimide oligomer represented by the following general formula (1), (a2) a polycarbonate diol represented by the following general formula (2), (a3) the following general formula ( 3) a dihydroxycarboxylic acid compound represented by 3), (a4) a side chain carboxyl group-containing polyimide resin obtained by reacting a diisocyanate compound represented by the following general formula (4), and (a5) an epoxy group in the molecule 5. The polyimide resin obtained by reacting at least one (meth) acryloyl group-containing compound and (a6) a polybasic acid anhydride, according to claim 1. Photosensitive resin composition.
General formula (1)
(Wherein X represents a tetravalent organic group having at least one ether bond, Y represents a divalent organic group, and a plurality of R _{1 s} independently represent a divalent organic group. P represents It is an integer from 0 to 20.)
General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)
General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)
General formula (4)
(In the formula, R ₄ is a divalent organic group.) The (a1) hydroxyl-terminated etherimide oligomer has at least one tetracarboxylic dianhydride having at least one ether bond in the molecule represented by the following general formula (5) or the following general formula (6), and the following general formula: The photosensitive resin composition according to claim 5, which is obtained by reacting the amino alcohol represented by (7).
General formula (5)
(In the formula, R ₅ represents a divalent organic group.)
General formula (6)
General formula (7)
(Wherein R ₆ is a divalent organic group.)   The (a1) hydroxyl group-terminated etherimide oligomer is in a molar ratio (number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule / number of moles of amino alcohol) = 0.25 to 0.75. The photosensitive resin composition according to claim 6, which is reacted within the range of The photosensitive resin composition according to claim 6, wherein the (a1) hydroxyl-terminated etherimide oligomer is obtained by further reacting with a diamino compound represented by the following general formula (8).
General formula (8)
(In the formula, R ₇ is a divalent organic group.)   The (a1) hydroxyl-terminated etherimide oligomer is in a molar ratio of (number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule) / (number of moles of amino alcohol + number of moles of diamino compound). The photosensitive resin composition according to claim 8, which is obtained by reacting within a range of = 0.25 to 1.0.   The (A1) polyimide resin has (a1) the number of moles of the hydroxyl-terminated etherimide oligomer (a1), (a2) the number of moles of polycarbonate diol (a2), and (a3) the number of moles of the dihydroxycarboxylic acid compound (a3). ), (A4) When the number of moles of the diisocyanate compound is (a4), [(a1) + (a2) + (a3)] / (a4) = 0.5 to 1.5, and [ (A1) + (a2)] / (a3) = 0.1 to 5.0, and (a5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule. When the number of moles is (a5), (a6) the number of moles of polybasic acid anhydride is (a6), (a3) / (a5) = 1.0 to 2.0, and (a5) / (A6) = obtained by reacting within the range of 1.0 to 2.0 The photosensitive resin composition according to any one of claims 5-9, characterized in that it is. The (A) polyimide resin is at least (a2) a polycarbonate diol represented by the following general formula (2), (a3) a dihydroxycarboxylic acid compound represented by the following general formula (3), (a4) the following general formula (4) And a terminal isocyanate compound represented by the following general formula (9) obtained by reacting the diisocyanate compound represented by the following general formula (5) or at least 1 in the molecule represented by the following general formula (6): (A5) a compound having an epoxy group and at least one (meth) acryloyl group in the molecule, and (a5) a side chain carboxyl group-containing polyimide resin obtained by reacting a tetracarboxylic dianhydride having two ether bonds and 5. A6) a polyimide resin obtained by reacting a polybasic acid anhydride (A2). The photosensitive resin composition according to any one.
General formula (2)
(In the formula, plural R _{2 s} each independently represent a divalent organic group. Q is an integer of 1 to 20.)
General formula (3)
(In the formula, R ₃ represents at least a trivalent organic group.)
General formula (4)
(In the formula, R ₄ is a divalent organic group.)
General formula (9)
(In the formula, a plurality of R ₂ each independently represents a divalent organic group, R ₃ represents at least a trivalent organic group, and a plurality of R ₄ each independently represents a divalent organic group. q, l, m, and n are integers of 1 to 20.)
General formula (5)
(In the formula, R ₅ represents a divalent organic group.)
General formula (6)   In the (A2) polyimide resin, the number of moles of (a2) polycarbonate diol is (a2), the number of moles of (a3) dihydroxycarboxylic acid compound is (a3), and the number of moles of (a4) diisocyanate compound is (a4). In this case, the reaction is carried out within the range of [(a2) + (a3)] / (a4) = 0.4 to 0.9, and (a7) a tetracarboxylic acid diester having at least one ether bond in the molecule. When the number of moles of anhydride is (a7), the reaction is performed within the range of (a4) / (a7) = 0.5 to 5.0, and (a5) an epoxy group and at least one in the molecule When the number of moles of the compound having a (meth) acryloyl group is (a5) and the number of moles of the (a6) polybasic acid anhydride is (a6), (a3) / (a5) = 1.0-2. 0 and (a5) / (a6) = 1 11. The photosensitive resin composition, wherein a obtained by reacting in the range of 0 to 2.0. The (A2) polyimide resin comprises a terminal isocyanate compound represented by the general formula (9) and a tetracarboxylic acid having (a7) at least one ether bond in the molecule represented by the general formula (5) or the general formula (6). A side chain carboxyl group-containing polyimide resin obtained by reacting acid dianhydride and further reacting with (a8) a diamino compound represented by the following general formula (8), and (a5) an epoxy group in the molecule The photosensitive resin composition according to claim 11, which is obtained by reacting at least one compound having (meth) acryloyl groups and (a6) a polybasic acid anhydride.
General formula (8)
(In the formula, R ₇ is a divalent organic group.)   When the (A2) polyimide resin has (a7) the number of moles of tetracarboxylic dianhydride having at least one ether bond in the molecule as (a7) and (a8) the number of moles of diamino compound as (a8) The photosensitive resin composition according to claim 13, wherein the photosensitive resin composition is obtained by reacting in the range of (a7) / (a8) = 1.0 to 5.0.   The weight ratio of the component (A), the component (B), the component (C), and the component (D) in the photosensitive resin composition is 5 parts by weight with respect to 100 parts by weight of the component (A). The component according to any one of claims 1 to 14, wherein the component (C) is 0.1 to 20 parts by weight, and the component (D) is 0.5 to 100 parts by weight. Photosensitive resin composition.   The photosensitive resin composition solution obtained by melt | dissolving the photosensitive resin composition of any one of Claims 1-14 in the organic solvent.   The photosensitive film obtained by apply | coating the photosensitive resin composition solution of Claim 16 to a base-material surface, and drying.   An insulating film obtained by curing the photosensitive film according to claim 17.   A printed wiring board with an insulating film, wherein the insulating film according to claim 18 is coated on a printed wiring board.