JP4788210B2 - Transfer foil - Google Patents

Description

The present invention relates to a transfer foil obtained by laminating a transfer film having at least a release layer, a decoration layer, and an adhesive layer on a base film.

There are known transfer foils obtained by laminating a transfer film having at least a release layer, a decoration layer, and an adhesive layer on a base film. These transfer foils are heated and pressed from the base film side to cover the adhesive layer. After transferring to the transfer material, the substrate film is peeled off and transferred.
When transferring to the paper material surface using such a transfer foil, the surface of the paper material is not uniform when compared with the resin fiber surface in which the paper fiber is folded, that is, between the transfer layer and the paper material. Adhesiveness is poor.
Further, since the paper material is porous, the adhesive layer heated and melted at the time of transfer may permeate into the paper material and cause poor adhesion.
In order to deal with such defects, it is necessary to increase the coating amount of the adhesive layer, but in that case, blocking of the transfer foil roll during storage or generation of burrs at the transfer foil edge during transfer The problem of (foil breakage failure) occurs.
In addition, when the transfer foil is transferred to a resin as a transfer target, the resin as the transfer target serves as a protective layer for the decorative layer. On the other hand, when the transfer foil is transferred to a paper quality material, Unlike resin, the material is easy to permeate liquid, and there is a problem of deterioration of the decorative layer due to liquid such as water, alcohol, or acid that has entered from the paper material side (see, for example, Patent Document 1).
Japanese Patent No. 3140823

An object of the present invention is to provide a transfer foil that can maintain adhesiveness even when the transfer foil is transferred to the surface of a porous material such as a paper-like material, and does not block the transfer foil roll during storage, and has a good foil breakage. Is to provide.
Moreover, the subject of this invention is providing the transfer foil which improved the tolerance of the decoration layer by providing a protective layer between the adhesion layer of a transfer foil, and a decoration layer.

In the transfer foil formed by laminating a transfer layer having at least a release layer, a decoration layer, a protective layer, and an adhesive layer on the base film,
The protective layer contains titanium oxide and silicon oxide,
The adhesive layer contains three or more kinds of inorganic compounds having different particle diameters in the ethyl acrylate / methyl methacrylate copolymer resin, and the average of at least one of the inorganic compounds is 0.1 to An inorganic compound having an average particle size of 2 to 8 μm at 0.5 μm and at least one other particle size,
It is the transfer foil characterized by this.

The invention according to claim 2 is the transfer foil according to claim 1, wherein the adhesive layer contains two or more inorganic compounds having different compositions .

According to a third aspect of the present invention, the inorganic compound having an average particle size of 0.1 to 0.5 μm is calcium carbonate, silicon oxide, aluminum oxide, aluminum hydroxide, aluminum silicate, barium sulfate, kaolin, clay. The transfer foil according to claim 1 , wherein the transfer foil is selected from.

The invention according to claim 4 is the transfer foil according to claim 1 , wherein the inorganic compound having an average particle diameter of 2 to 8 μm is an aggregate of nanoparticles .

The invention according to claim 5 is the transfer foil according to claim 4 , wherein the aggregate of the nanoparticles is silicon oxide or glass beads .

The invention according to claim 6 is the adhesive layer comprising: polyvinyl acetate, polyvinyl chloride, polystyrene, nylon, acrylic resin, ethylene, vinyl acetate copolymer resin, vinyl chloride / vinyl acetate copolymer resin in the adhesive layer. The transfer foil according to claim 1 , wherein the transfer foil is added at a ratio of 10 to 50% by weight of the total resin .

The invention according to claim 7 is the transfer foil according to claim 1 , wherein the decorative layer has a hologram .

The invention according to claim 8 is the transfer foil according to claim 7 , wherein the hologram is a hologram having a metal layer .

The invention described in claim 9 is a transfer object formed by transferring the transfer foil described in any one of claims 1 to 8 onto paper .

The invention according to claim 10 is the article to be transferred according to claim 9 , wherein the paper is paper having an image layer .

In the transfer foil of the present invention, the inorganic layer having three or more different particle diameters is contained in the adhesive layer so that the thickness of the adhesive layer is not constant, so that the transfer foil is also blocked when stored in a roll shape. And exhibiting excellent storage stability.
Moreover, it becomes possible to improve foil cutting by making the thickness of the adhesive layer non-constant and by adding inorganic compounds having different compositions to the adhesive layer.
In addition, when the number of moles of methyl methacrylate is 100, the resin used for the adhesive layer is a copolymer resin in which the blend of ethyl acrylate is 250 to 400 moles, and the inorganic compound is added to the resin. As a result, particularly when transferring to a paper material, it has better adhesion than conventional transfer foils.
Further, by providing a protective layer containing titanium oxide and silicon oxide between the adhesive layer and the decoration layer, it is possible to improve the resistance of the decoration layer when the transfer foil is transferred to a paper material.

An example of the embodiment of the transfer foil of the present invention will be described with reference to FIGS. 1, 2, and 3, but is not limited thereto.

First, the peeling layer 4 is formed on the surface of the base material 2 (FIG. 1A).

As a material of the base material 2, what is necessary is just what has peelability with the peeling layer 4, and heat resistance, Polyester represented by polyethylene terephthalate, a polypropylene, etc. can be used.
Moreover, as thickness of the base material 2, 5-200 micrometers is preferable, Furthermore, 15-20 micrometers is preferable.

As a material for the release layer 4, urethane resin, melamine resin, fiber-based resin, epoxy resin, acrylic resin, butyral resin, vinyl chloride / vinyl acetate copolymer resin, and the like can be used. Preference is given to using methyl methacrylate.
Moreover, a wax etc. can be used as needed.
The thickness of the release layer 4 is preferably 10 μm or less, and more preferably 1 to 3 μm.
Moreover, in order to acquire the effect which makes peeling easy, and the effect which protects the decoration layer 5 formed on the peeling layer 4, you may laminate | stack the peeling layer 4 to two or more layers.

As a coating method of the release layer 4, methods such as a roll coating method, a gravure coating method, a wire bar coating method, and an air knife coating method can be used.

Next, the decoration layer 5 is formed on the peeling layer 4 (FIG. 1B).

The decorative layer 5 is provided in order to improve the decorative property of the transfer foil, and is a pattern layer with a pattern, a pattern, a pattern, etc., or a solid print layer with an ink, or a metal vapor deposition layer. Each layer consists of a partial metal deposition layer, a hologram layer having a diffractive structure, a transparent colored layer, etc., or a single layer or two or more of these layers.

Next, the adhesive layer 6 is formed on the decorative layer 5 (FIG. 1C).

As a material for the adhesive layer 6, a copolymer resin of ethyl acrylate and methyl methacrylate can be used. When the number of moles of methyl methacrylate is 100, the blend of ethyl acrylate is 250 to 400 in moles. It is preferable that
Depending on the type and amount of the inorganic compound added, it may be difficult to disperse the inorganic compound in the resin. In that case, in addition to these resins, polyvinyl acetate, polyvinyl chloride, polystyrene, When nylon, acrylic resin, ethylene / vinyl acetate copolymer resin, or vinyl chloride / vinyl acetate copolymer resin is added at a ratio of 10 to 50% by weight of the total resin of the adhesive layer, dispersion can be easily performed.

The inorganic compound contained in the adhesive layer 6 is an inorganic compound having three or more different particle diameters, and an average of at least one of these particle diameters is 0.1 to 0.5 μm, and two or more inorganic compounds. It is preferable that the inorganic compounds have different compositions.

Calcium carbonate, silicon oxide, aluminum oxide, aluminum hydroxide, aluminum silicate, barium sulfate, kaolin, clay, or the like is used as an inorganic compound having an average particle size of 0.1 to 0.5 μm contained in the adhesive layer 6. be able to.

The at least one inorganic compound is preferably an aggregate of nanoparticles, and is an irregular particle having an average particle size of 2 to 8 μm.
As the inorganic compound having an average particle size of 2 to 8 μm, silicon oxide, glass beads, or the like can be used.

Moreover, by adding an inorganic compound having an average particle diameter of 2 to 8 μm to the adhesive layer 6, the adhesive layer is easily broken by using the inorganic compound as a trigger, and the average particle diameter is 0.1 to 0.5 μm. Compared to inorganic compounds alone, the foil breakage during transfer is better.

Further, when the transfer foil is transferred to the paper material by adding an inorganic compound having an average particle size of 2 to 8 μm to the adhesive layer 6, the average particle size of the porous holes on the surface of the paper material is 2 to 8 μm. To prevent adhesion failure caused by excessive penetration of the resin in the adhesive layer melted during transfer and the inorganic compound having an average particle size of 0.1 to 0.5 μm into the paper material. it can.

Here, by using an inorganic compound having an average particle size of 2 to 8 μm for the adhesive layer 6, there is a risk that the smoothness of the surface of the transfer layer during transfer may be poor.
When the transfer foil is transferred to a paper material, the irregularities of the inorganic compound are absorbed by the porous nature of the paper material and the cushioning property due to the folded shape of the fiber, but the smoothness does not become defective, but the inorganic compound damages the decorative layer There is a fear.
By making an inorganic compound having an average particle diameter of 2 to 8 μm into an aggregate of nanoparticles, it is possible to absorb the impact during transfer and prevent the decorative layer from being damaged.

The transfer foil shown in FIG. 2 has a decorative layer protective layer 7 between the decorative layer 5 and the adhesive layer 6.
When a metal vapor deposition layer or a partial metal vapor deposition layer is used for the decorative layer 5 and these layers are adjacent to the adhesive layer, water resistance becomes a problem.
When the transfer foil of the present invention is transferred to a paper material, water and water vapor easily reach the metal vapor deposition layer or the partial metal vapor deposition layer.
The metal used for the metal vapor deposition layer or the partial metal vapor deposition layer is discolored by oxidation, and this discoloration is promoted by water or water vapor.
On the other hand, it is possible to improve the water resistance of the decorative layer 5 by providing the protective layer 7 of the decorative layer between the decorative layer 5 and the adhesive layer 6.

For the protective layer 7, a crosslinkable resin can be used, and as the crosslinking agent, those having an isocyanate group, an epoxy group, or an amino group can be used.
Moreover, water and water vapor may exhibit alkalinity or acidity, and sufficient resistance can be obtained by containing titanium oxide and silicon oxide in the protective layer 7.
As the titanium oxide, amorphous particles having an average particle size of 0.1 to 0.3 μm, and preferably an average particle size of 0.2 μm can be used.
As the silicon oxide, particles having an average particle size of 0.1 to 0.2 [mu] m, preferably particles having an average particle size of 0.1 [mu] m can be used.

When the transfer foil shown in FIG. 1 is transferred to a paper material, a solvent such as toluene, ethanol, methyl ethyl ketone, isopropanol, etc. easily reaches the decorative layer 5 from the paper material side.
Since the pattern layer, the solid print layer, the hologram layer on which the diffraction grating is formed, and the like that form the decoration layer 5 are formed using these solvents as dilution solvents, the resistance to the solvent is low even after the formation.
On the other hand, by providing the protective layer 7 of the decoration layer 5 between the decoration layer 5 and the adhesive layer 6, the solvent resistance of the decoration layer 5 can be improved.
The protective layer 7 of the decorative layer 5 is not limited to a single layer, and two or more layers can be laminated. For example, when the adhesive strength between the protective layer 7 of the decorative layer 5 and the adhesive layer 6 of the transfer foil shown in FIG. The anchor layer 8 can be provided between the protective layer 7 and the adhesive layer 6 of the decorative layer 5.

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

First, a release layer A was formed on the surface of a transparent polyethylene terephthalate (PET) film having a thickness of 19 μm so that the film thickness would be 1 μm after applying and drying a transparent ink comprising the following composition.

Release layer A ink composition, polymethyl methacrylate 29% by weight
・ Polyethylene powder 1% by weight
・ Toluene 40% by weight
・ Methyl ethyl ketone 30% by weight

Next, the release layer B was formed so that the film thickness would be 1 μm after applying and drying a transparent ink comprising the following composition.

Release layer B ink composition / acrylic resin 35% by weight
・ Tolylene diisocyanate 5% by weight
・ Toluene 40% by weight
・ Methyl ethyl ketone 20% by weight

Next, an ink composed of the following composition is applied to form a diffractive structure forming layer so that the film thickness after baking and drying at 150 ° C. for 10 seconds is 1 μm, and further optical (ly) variable by roll embossing. A device relief pattern was formed, and then aluminum was formed to a thickness of 50 nm by vacuum deposition.

Decorative layer ink composition 20% by weight of nitrocellulose
・ Polyvinylpyrrolidone 15% by weight
・ Urethane resin 5% by weight
・ Toluene 30% by weight
・ Methyl ethyl ketone 20% by weight
・ Isopropyl alcohol 10% by weight

Next, the ink which consists of the following composition was pattern-printed, and it formed so that the film thickness after drying might be set to 1 micrometer.

Protective layer ink composition / polyvinyl acetate 13% by weight
・ Hexamethylene diisocyanate 2% by weight
・ Titanium oxide 3% by weight
・ Silicon oxide 2% by weight
・ Toluene 40% by weight
・ Methyl ethyl ketone 40% by weight

Next, it is immersed in a bath containing 1.5N sodium hydroxide solution heated to 50 ° C. for 10 seconds, etched aluminum, neutralized with 0.1N hydrochloric acid solution, then washed with water and dried. To form a partial metal vapor-deposited layer, a decorative layer having a layer having a diffractive structure, and a decorative layer protective layer which is a water-resistant resin layer protecting the partial metal vapor-deposited layer.

Finally, an ink composed of the following composition was applied, and an adhesive layer was formed so that the average thickness after drying was 5.5 μm to obtain a transfer foil.

Adhesive layer ink composition 10% by weight of ethyl acrylate / methyl methacrylate copolymer resin (molar ratio 100/30)
・ Vinyl chloride / vinyl acetate copolymer resin 10% by weight
・ Silicon oxide (average particle size 3μm) 5% by weight
・ Silicon oxide (average particle size 0.1 μm) 2% by weight
・ Barium sulfate 3% by weight
・ Toluene 40% by weight
・ Methyl ethyl ketone 30% by weight

<Comparative Example 1>
A transfer foil was formed in the same manner as in Example 1 except that the silicon oxide (average particle size 3 μm) of the adhesive layer was not added, and the transferability (foil breakage) and adhesion were examined.
When the transfer foil of Example 1 and the transfer foil of Example 2 were transferred to paper under the same conditions, transferability was lower in Comparative Example 1 than in Example 1.

Also, after transferring the transfer foil of Example 1 and the transfer foil of Example 2 to paper under the same conditions, each was embedded in an epoxy resin, then the cross-section was taken out with an ultramicrotome and observed with an optical microscope As a result, in Example 1, the thinnest part of the adhesive layer was 1 μm, and in Comparative Example 1, the thinnest part of the adhesive layer was less than 0.5 μm. There were few, and adhesiveness fell.

Further, when the surface of the adhesive layer of the transfer foil of Example 1 and the surface of the adhesive layer of the transfer foil of Comparative Example 1 were observed with a scanning electron microscope, Example 1 was clearly larger in unevenness than Comparative Example 1, When these transfer foils were stored in the state of rolls, blocking was less likely to occur in Example 1 than in Comparative Example 1.

<Comparative example 2>
A transfer foil was formed in the same manner as in Example 1 except that 5% by weight of barium sulfate was added without adding titanium oxide and silicon oxide of the protective layer, and the water resistance and solvent resistance of the decorative layer were examined.
After the transfer foil of Example 1 and the transfer foil of Comparative Example 2 were transferred to paper under the same conditions, each of the transfer foils after being immersed in distilled water at 100 ° C. for 30 minutes was observed. Compared with 1, the cloudiness and disappearance of aluminum luster were observed, and it was confirmed that Example 1 had higher water resistance than Comparative Example 2.

In addition, when the transfer foil of Example 1 and the transfer foil of Comparative Example 2 were transferred to paper under the same conditions, the transfer foil after being immersed in ethanol was observed. Disappearance of aluminum luster and foaming were observed, and Example 1 was confirmed to have higher solvent resistance than Comparative Example 2.

<Comparative Example 3>
A transfer foil was formed in the same manner as in Example 1 except that the barium sulfate of the adhesive layer was not added, and the transferability (foil breakage) was examined.
When the transfer foil of Example 1 and the transfer foil of Comparative Example 3 were transferred to paper under the same conditions, the transferability was reduced in Comparative Example 3 as compared with Example 1.

The transfer foil of the present invention exhibits excellent transfer stability to paper substrates and excellent resistance after paper transfer, so transfer of various paper products such as cartons, wrapping paper, toys, stationery, etc. Can be used as a foil.
In addition to printing, various design designs such as metal thin films and holograms are possible, so it can be used as a counterfeit prevention transfer foil for securities, gift certificates, authentication marks, banknotes, lotteries, passports, membership tickets, air tickets, etc. it can.

Sectional drawing which shows one example of this invention transfer foil Sectional drawing which shows the other example of this invention transfer foil Sectional drawing which shows the other example of this invention transfer foil

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer foil 2 Base material 3 Transfer layer 4 Release layer 5 Decoration layer 6 Adhesive layer 7 Protection layer 8 of decoration layer Anchor layer

Claims (10)

In the transfer foil formed by laminating a transfer layer having at least a release layer, a decoration layer, a protective layer, and an adhesive layer on the base film,
The protective layer contains titanium oxide and silicon oxide,
The adhesive layer contains three or more kinds of inorganic compounds having different particle diameters in the ethyl acrylate / methyl methacrylate copolymer resin, and the average of at least one of the inorganic compounds is 0.1 to An inorganic compound having an average particle size of 2 to 8 μm at 0.5 μm and at least one other particle size,
A transfer foil characterized by that. The transfer foil according to claim 1, wherein the adhesive layer contains two or more inorganic compounds having different compositions . The inorganic compound having an average particle size of 0.1 to 0.5 µm is selected from calcium carbonate, silicon oxide, aluminum oxide, aluminum hydroxide, aluminum silicate, barium sulfate, kaolin, and clay. Item 2. The transfer foil according to Item 1 . The transfer foil according to claim 1 , wherein the inorganic compound having an average particle diameter of 2 to 8 μm is an aggregate of nanoparticles . The transfer foil according to claim 4 , wherein the aggregate of nanoparticles is silicon oxide or glass beads . In the adhesive layer, polyvinyl acetate, polyvinyl chloride, polystyrene, nylon, acrylic resin, ethylene, vinyl acetate copolymer resin, vinyl chloride / vinyl acetate copolymer resin, 10 to 50% by weight of the total resin of the adhesive layer The transfer foil according to claim 1 , wherein the transfer foil is added at a ratio of The transfer foil according to claim 1 , wherein the decorative layer has a hologram . The transfer foil according to claim 7 , wherein the hologram is a hologram having a metal layer . An object to be transferred, which is formed by transferring the transfer foil according to any one of claims 1 to 8 onto paper. The material to be transferred according to claim 9 , wherein the paper is paper having an image layer .