JP2003157009A - Thermosensitive label using coating agent of high luminance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosensitive label in which a metallic luster layer region is simply and easily formed at a low cost and in which the metallic luster layer region and a nonmetallic luster layer region are formed in a pattern of optional shape and to provide its manufacturing method. SOLUTION: In the method of manufacturing the thermosensitive label in which a printed layer or an applied layer having the metallic luster layer region and a thermosensitive adhesive layer are provided on a base material film, the thermosensitive label in which the metallic luster layer region contains a binding resin and a metallic thin film pieces and the metallic luster layer region provided on the base material film are formed by printing or applying a coating agent of high luminance containing the binding resin and the metallic thin film pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive label in which a printing layer or a coating layer having a metallic luster layer region and a heat-sensitive adhesive layer are provided on a base film, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, for providing a metallic luster layer region on a heat-sensitive label, there is a method of applying or printing a metallic ink, or a method of performing metal vapor deposition. Since the former is performed by coating or printing, it is possible to easily and inexpensively provide the metallic luster layer region, but since the existing aluminum paste or the like is used, sufficient metallic luster cannot be obtained. In the latter, on the other hand, a sufficient metallic luster can be obtained,
Since the process becomes complicated and a dedicated device is required, it is expensive.

In the formation of the metallic luster layer region by the conventional metallic ink, a mixture of ink with aluminum paste, pearl pigment, bronze powder or the like is used. The brightness and the hiding power are affected by the particle size of each pigment. Generally, as the particle size increases, the brightness increases, but the hiding power decreases. Even the highest grade products currently on the market are significantly inferior in brightness and concealing property to metal vapor deposition.

When aluminum is vapor-deposited, an anchor coat for vapor-depositing the ink surface, which requires a metallic luster layer region, must first be formed in order to perform a window punching process on the vapor-deposited portion. Furthermore, it is necessary to print a varnish called a water washing primer in advance on a portion where the metallic luster layer area is unnecessary. The printed matter up to this point must be aluminum evaporated and subjected to a water washing step to remove unwanted areas of the metallic luster layer. After washing with water, a heat-sensitive adhesive layer is provided and cut into a heat-sensitive label.
Since the aluminum vapor deposition surface is deteriorated by being exposed to air, it is necessary to proceed to the next step as soon as possible. As described above, the productivity of aluminum vapor deposition is low, which is also a cause of high cost.

[0005]

An object of the present invention is to provide a heat-sensitive label in which a metallic luster layer region is simply and inexpensively formed, and a metallic luster layer region and a non-metallic luster layer region are patterned in an arbitrary shape. , To provide a manufacturing method thereof.

[0006]

Means for Solving the Problems The inventors of the present invention applied a high-intensity coating agent containing a binder resin and metal thin film strips on a base film to obtain a brightness equivalent to that of aluminum vapor deposition. It was found that a metallic luster layer region having a gap can be formed, and the above problems were solved.

That is, the present invention is, firstly, a heat-sensitive label in which a printing layer or a coating layer having a metallic gloss layer region and a heat-sensitive adhesive layer are provided on a substrate film, the metallic gloss layer region being A heat-sensitive label comprising a binder resin and a thin metal film strip. Secondly, there is provided a method for producing a heat-sensitive label having a metallic gloss layer region and a heat-sensitive adhesive layer on a base film, the metallic gloss layer region being a high-intensity coating containing a binder resin and a metal thin film strip. Provided is a method for producing a heat-sensitive label, which is characterized in that it is formed by printing or applying an agent.

By the above means, a thermal label in which a metallic glossy layer region having a brightness equivalent to that of aluminum vapor deposition is patterned in an arbitrary shape, and a method for producing the thermal label, which allows the label to be simply and inexpensively produced, are provided. You can do it. The heat-sensitive label having the metallic luster layer region of the present invention and the method for producing the same will be described below in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION 1. High-intensity coating agent The high-intensity coating agent used in the present invention comprises a thin metal film strip, a binder resin, an additive, and a solvent. Usually, metal powder is used for the metallic coating agent, but when a metal thin film strip is used, the result is that the metal thin film strip is oriented parallel to the surface of the object when the coating agent is applied. A high-brightness mirror-like metallic luster that cannot be obtained with conventional metal powders can be obtained.

(1) Metal thin film strip As the metal of the metal thin film strip, aluminum, gold, silver,
Copper, brass, titanium, chrome, nickel, nickel chrome, stainless steel, etc. can be used. As a method of forming a metal into a thin film, vapor deposition is used in the case of a metal having a low melting point such as aluminum, foil is used in the case of having malleability such as aluminum, gold, silver and copper, and metal is used in the case of a metal having a high melting point and not being malleable. , Sputtering, etc. can be mentioned. The thickness of the metal thin film is preferably 0.01 to 0.1 μm, more preferably 0.03 to 0.08 μm. The size in the plane direction of the metal thin film strips dispersed in the coating agent is
5 to 25 μm is preferable, and 10 to 15 is more preferable.
μm. When the size is less than 5 μm, the brightness of the coating film becomes insufficient, and when it exceeds 25 μm, the thin metal film pieces are difficult to be oriented, and the brightness is lowered. When the high-brightness coating agent is applied by the gravure method or the screen printing method, it causes clogging of the plate.

The method for producing the metal thin film strip will be described below by taking the vapor deposition method as an example. A polyolefin film, a polyester film, or the like can be used as the support film on which the metal is deposited. First, a release layer is provided by coating on a support film, and then a metal is vapor-deposited on the release layer so as to have a predetermined thickness. A top coat layer is applied to the surface of the deposited film to prevent oxidation. The same coating agent can be used for forming the release layer and the topcoat layer.

The resin used for the release layer or the top coat layer is not particularly limited. Specific examples include cellulose derivatives, acrylic resins, vinyl resins, polyamides, polyesters, EVA resins, chlorinated polypropylene, chlorinated EVA resins, petroleum resins and the like. Examples of the solvent include aromatic hydrocarbons such as toluene and xylene, aliphatic or alicyclic hydrocarbons such as n-hexane and cyclohexane, esters such as ethyl acetate and propyl acetate, methanol, ethanol and isopropyl alcohol. Alcohols, ketones such as acetone and methyl ethyl ketone, and alkylene glycol monoalkyl ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether can be used.

The above metal vapor deposition film is immersed in a solvent that dissolves the release layer and the top coat layer and stirred, and the metal vapor deposition film is peeled from the support film, and then further stirred to increase the size of the metal thin film strip. The thickness is adjusted to about 150 μm, filtered and dried. The solvent is not particularly limited, except that it dissolves the resin used in the release layer or the top coat layer. Even when the metal thin film is formed by sputtering, the metal thin film strip can be formed by the same method as described above. When a metal foil is used, it may be ground in a solvent as it is with a stirrer to a predetermined size.

The metal thin film strip is preferably surface-treated in order to enhance the dispersibility in the high-intensity coating agent. Surface treatment agents include stearic acid, oleic acid,
Examples thereof include organic fatty acids such as palmitic acid, methylsilylisocyanate, nitrocellulose, cellulose acetate propionate, cellulose acetate butyrate, and cellulose derivatives such as ethyl cellulose, which are adsorbed on the surface of the metal thin film strip by a commonly known method.

(2) Binder Resin As the binder resin, those commonly used in conventional paints, gravure inks, flexo inks, screen inks and the like can be used. Specifically, for example,
(Meth) acrylic resin, polyester, polyamide, polyurethane, urea resin, melamine resin, epoxy resin,
Examples thereof include rosin-modified maleic acid resin, petroleum-based resin, polystyrene, styrene-maleic acid resin, shellac and alkyd resin.

(3) Additives In the high-intensity coating agent used in the heat-sensitive label of the present invention, various additives used in conventional paints, gravure inks, flexo inks, screen inks, etc. may be added, if necessary. Can be used. Such additives include coloring pigments, dyes, waxes, plasticizers,
Leveling agents, surfactants, dispersants, defoamers, chelating agents and the like can be mentioned.

(4) Solvent The solvent used for the high-intensity coating agent used in the heat-sensitive label of the present invention may also be a known solvent commonly used in conventional paints, gravure inks, flexo inks, screen inks and the like. Can be used. Specifically, for example, aromatic hydrocarbons such as toluene and xylene, aliphatic or alicyclic hydrocarbons such as n-hexane and cyclohexane, esters such as ethyl acetate and propyl acetate, methanol, ethanol, isopropyl alcohol and the like. Examples thereof include alcohols, acetone, ketones such as methyl ethyl ketone, and alkylene glycol monoalkyl ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether.

(5) Method for preparing high-intensity coating agent Generally, in order to stably disperse the raw materials for the coating agent, a roll mill, a ball mill, a bead mill, a sand mill, or the like is used to knead the mixture to add a pigment and the like. The agent is micronized to submicron. However, in the high-intensity coating agent used for the heat-sensitive label of the present invention, the metal thin film flakes to be blended in order to develop the metallic luster need to have a size of 5 to 25 μm, and when the above-mentioned kneading is performed, the metal is not The thin film pieces become fine particles, and the metallic luster is extremely reduced. Therefore, in the present invention, the meat is not kneaded, and the above blended raw materials are simply mixed to form a coating agent. To that end, for the purpose of improving dispersibility,
As described above, it is preferable to surface-treat the thin metal film strip.

2. Heat-sensitive label (1) Label substrate film and heat-sensitive adhesive In the present invention, it means a heat-sensitive label using a heat-sensitive adhesive (delayed tack) for adhesion to a substrate. As the heat-sensitive adhesive, there are conventionally known and commonly used adhesives such as Dickseal DLA (manufactured by Dainippon Ink and Chemicals, Inc.) and Heat Magic (manufactured by Toyo Ink Mfg. Co., Ltd.), and the heat-sensitive adhesive layer is 10 A coating amount of ˜15 g / m ² is generally used, and the coating amount is arbitrarily used in consideration of adhesive strength and the like. As the substrate film, a conventionally known and commonly used film such as paper, olefin, polyester, etc. can be used. For example, in a heat-sensitive label of a beverage container, if it is desired to impart a heat insulating effect, it is preferable to use foamed polyolefin or the like. The heat-sensitive label according to the present invention can be produced in the same manner as a known heat-sensitive label, except that a metallic gloss layer region is provided in a part of the printed layer.

(2) Formation of metallic luster layer area The metallic luster layer area of the heat-sensitive label of the present invention is formed by applying or printing a high-intensity coating agent on one surface of the base film. It is possible to mass-produce a large area of the metallic luster layer area, which requires a large scale of equipment in the conventional vapor deposition or sputtering of metal, by a high-speed and inexpensive method such as coating or printing.

As a coating method, a usual coating method such as roll coating, gravure coating, curtain coating, spray coating, die coating and the like can be mentioned. In addition to these, the fact that a printing method such as gravure printing, flexographic printing, or screen printing can be used is also one of the major characteristics of the present invention. In the printing method, since the plate is used, not only the entire surface application but also a partial metal glossy layer region having an arbitrary pattern can be formed at an arbitrary position. In the case of performing gravure printing, it is also possible to create a gradation in which the light reflectance of the metallic glossy layer region has continuous gradation. When the in-mold label having the metallic luster layer region of the present invention is used, not only the metallic luster but also the anti-counterfeiting effect due to gradation can be imparted, and the degree of freedom in design design is significantly improved. .

[0022]

EXAMPLES The present invention will be described in more detail below with reference to examples. In addition, unless otherwise indicated, a part and% represent a mass part and mass%, respectively.

<Preparation of High Brightness Coating Agent> (1) Aluminum thin film strip nitrocellulose (HIG7) was dissolved in a mixed solvent of ethyl acetate: isopropyl alcohol = 6: 4 to prepare a 6% solution. The solution was applied onto a polyester film with a gravure plate having a screen line number of 175 lines / inch and a cell depth of 25 μm to form a release layer. After drying well,
Aluminum is vapor-deposited on the release layer to a thickness of 0.04 μm, and the same nitrocellulose solution as that used for the release layer is applied on the surface of the vapor-deposited film under the same conditions as for the release layer, and the top coat is applied. Layers were formed. The vapor-deposited film is immersed in a mixed solvent of ethyl acetate: isopropyl alcohol = 6: 4 to separate the vapor-deposited aluminum film from the polyester film, and then the vapor-deposited aluminum film is pulverized with a stirrer to a size of about 150 μm. , Aluminum thin film strips were prepared.

(2) Aluminum thin film strip slurry Aluminum thin film strip 10 parts Ethyl acetate 35 parts Methyl ethyl ketone 30 parts Isopropyl alcohol 30 parts The above components were mixed and 5 parts of a nitrocellulose solution having the following composition was added with stirring. Nitrocellulose (HIG1 / 4) 25% Ethyl acetate: isopropyl alcohol = 6: 4 mixed solvent 75% Using the above mixture while maintaining the temperature at 35 ° C or lower, the size of the aluminum thin film strips was measured by using a turbo mixer. The mixture was stirred until it became 10 to 15 μm to prepare an aluminum thin film strip slurry.

[0025]   (3) High brightness coating agent     Aluminum thin film strip slurry 30 parts     Urethane resin (Dainippon Ink and Chemicals'Bernock L7-617 ') 30 parts     Chlorinated polypropylene (Nippon Paper's "Super Clone 803M") 2 parts     Polyethylene wax compound with the following composition 3 parts           Mitsui Chemicals "High Wax 210P" 20%           Nitrocellulose (HIG7) 10%           70% ethyl acetate     30 parts ethyl acetate The above was mixed to prepare a high brightness coating agent.

<Gravure printing plate> The following gravure plates were used for coating or printing the high-intensity coating agent on one surface of the substrate film partially or entirely. Gravure engraving machine: Heligravure Systems'"Heli
oKlischograph K500 ”Screen frequency: 175 lines / inch Cell depth: 25-30 μm Stylus angle: 120 °

(Example 1) <Surface-printing heat-sensitive label (1) using a milky white fabric> A commercially available foamed milky white olefin film was partially printed with a high-intensity coating agent using a gravure plate, and then a partial metal was prepared. A gloss layer area was formed. Then, after printing various color inks (“Fine Wrap NTV Type Ink” manufactured by Dainippon Ink and Chemicals, Inc.) on the gravure plate, an overcoat varnish (Dainippon Ink and Chemicals, Inc., “Fine Fine”) is used as a protective layer. 5% of "CVL Hardener No. 10" (manufactured by the same company) was printed on "Wrap NTMV Top Coat Varnish". Furthermore, a heat-sensitive adhesive (Daic Nippon Ink & Chemicals Co., Ltd. "Dickseal DLA-820" was applied to the opposite surface on which the high-intensity coating agent and the color ink were printed.
K ”) was applied at a coating amount of 15 g / m ² to obtain a heat-sensitive label.

(Example 2) <Surface-printing heat-sensitive label (2) using a milky white fabric> A commercially available foamed milky white polyester film was partially printed with a high-intensity coating agent using a gravure plate, and then a partial metal was first prepared. A gloss layer area was formed. Then, after printing various color inks (“Fine Wrap NTV Type Ink” manufactured by Dainippon Ink and Chemicals, Inc.) on the gravure plate, an overcoat varnish (Dainippon Ink and Chemicals, Inc., “Fine Fine”) is used as a protective layer. 5% of "CVL Hardener No. 10" (manufactured by the same company) was printed on "Wrap NTMV Top Coat Varnish". Furthermore, a heat-sensitive adhesive (Daic Nippon Ink & Chemicals Co., Ltd. "Dickseal DLA-820" was applied to the opposite surface on which the high-intensity coating agent and the color ink were printed.
K ”) was applied at a coating amount of 15 g / m ² to obtain a heat-sensitive label.

(Example 3) <Back-printing heat-sensitive label using transparent film> Various color inks (“Fine Wrap NTV type ink manufactured by Dainippon Ink and Chemicals, Inc.” were used on a commercially available olefin film using a gravure plate. )) To print the design. Then, the high-intensity coating agent was printed. On the surface on which the color ink and the high-intensity coating agent are printed, a heat-sensitive adhesive (“Dickseal ED” manufactured by Dainippon Ink and Chemicals, Inc.)
-920K ") was coated to a coating weight 15 g / ^{m 2} to obtain a heat-sensitive label.

[0030]

INDUSTRIAL APPLICABILITY The present invention makes it possible to form a high-brightness metallic luster layer region, which has heretofore been possible only by aluminum vapor deposition, by applying a high-brightness coating agent or by printing. As a result, a heat-sensitive label having a metallic luster layer area can be mass-produced inexpensively and at high speed. Furthermore, by performing gravure printing, it has become possible to form a gradation having continuous gradation in the metallic gloss layer region. For this reason, a remarkable effect that the anti-counterfeiting effect is given to the heat-sensitive label and the degree of freedom in design design is remarkably improved.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F100 AB01B AH10B AK01B AK03                       AL05B AR00B AT00A BA02                       BA44B DE05B EC182 EH46B                       EH462 EJ641 GB90 HB08B                       HB31B JL12B JN24B

Claims (4)

[Claims] 1. A heat-sensitive label comprising a base film, a printing layer or a coating layer having a metallic gloss layer region, and a heat-sensitive adhesive layer, wherein the metallic gloss layer region is a binder resin and a metal thin film strip. A heat-sensitive label comprising: 2. The heat-sensitive label according to claim 1, wherein the metal thin film strip is surface-treated with an organic fatty acid, methylsilyl isocyanate, or a cellulose derivative. 3. The heat-sensitive label according to claim 1, wherein the metallic luster layer region is patterned in an arbitrary shape. 4. A method for producing a heat-sensitive label having a metallic gloss layer region and a heat-sensitive adhesive layer on a base film, wherein the metallic gloss layer region contains a binder resin and a metal thin film strip. A method for producing a heat-sensitive label, which is characterized in that it is formed by printing or applying a coating agent.