JPS5833833B2 - Thermal transfer material with uneven patterns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal transfer material, and an object of the present invention is to provide a transfer material capable of transferring an uneven pattern onto the surface of an object to be transferred.

Conventionally, as a transfer material capable of transferring an uneven pattern to the surface of an object to be transferred, (1) as shown in Japanese Utility Model Publication No. 16804/1980, a material having an unevenness of 3μ or more on a surface constituting an arbitrary special pattern has been used. A transfer base material is provided with a transparent peeling layer that is as thin as the depth of the surface roughness, a colored layer of any color, and an adhesive layer, (2) JP-A-47-2
As shown in Japanese Patent No. 1210, a protective film layer is provided on the uneven surface of the sheet to form an inverse unevenness that matches the unevenness on a transfer base material having unevenness formed in an arbitrary pattern, and further with a pattern printed layer and an entirely opaque printed layer,
(3) As shown in Japanese Patent Publication No. 51-33454, multi-colored ink containing a curing retarder that retards the curing of a resin in a solvent-free paint and an ink that does not contain a curing retarder are used. A method is known in which a pattern-printed film is coated on a substrate coated with a solvent-free paint, the resin is cured in a resin-forming atmosphere of the solvent-free paint, and then the film is peeled off.

However, the transfer materials (1) and (2) are for transferring the uneven shape of the base sheet itself onto the surface of the object to be transferred;
In order to match the register of the uneven pattern and the color pattern, it is necessary to use a sophisticated technique of printing in which the uneven pattern of the base sheet and the color pattern are printed in perfect register. It has drawbacks such as difficulty in matching the registration of the uneven pattern and the color pattern, and difficulty in expressing a three-dimensional effect.

In addition, since the transfer material in (3) needs to be transferred to an uncured solvent-free coating film, pressure cannot be applied during transfer and bubbles may form between the transfer material and the solvent-free coating film. Since the solvent-based coating does not form a uniform film, and since an uncured solvent-free coating must be applied to the object to be transferred, the transfer area is limited to a horizontal plate-like area.

In addition, there is an economical problem in that an expensive curing device is required for each location where the transfer material is used.

In order to solve the drawbacks of the prior art, the present inventors have made extensive studies and found that after printing on the unevenness forming part with an ink containing a hardening modifier on a base sheet that has been subjected to a release process, After applying a curable resin such as an ultraviolet curable resin or a thermosetting resin, a thermal transfer material having a concavo-convex pattern layer formed with a concavo-convex pattern formed by UV irradiation, heat ray irradiation, etc. is applied to the transferred object. It was discovered that when the substrate sheet is layered and thermally coated on the surface and the base sheet is peeled off and removed, an uneven pattern corresponding to the uneven pattern of the uneven pattern layer on the base sheet is transferred and formed on the surface of the transferred object, leading to the completion of the present invention. It was.

The correspondence of the uneven pattern is such that the resin in the concave parts of the uneven pattern caused by the ink containing the hardening modifier is exposed to ultraviolet rays,
This is because even after curing treatment such as heat ray irradiation, the resin retains thermoplasticity compared to the resin in the convex portions, and during thermocompression bonding, it softens and sinks, forming concave portions on the surface of the transfer target.

This phenomenon was discovered for the first time by the present invention, and the feature of the present invention resides here.

Next, the constituent elements and processing method of the thermal transfer material capable of transferring an uneven pattern of the present invention will be specifically explained using the drawings.

First, a release layer 2 that is peeled off from the base sheet 1 during thermocompression bonding is provided on the base sheet 1, then a printed pattern layer with an arbitrary pattern is provided as needed, and the concave portions are further coated with ink containing a hardening inhibitor. After forming a pattern layer 3 for forming convex portions or a pattern layer 3' for forming convex portions using ink containing a curing accelerator, the entire surface is coated with a curable resin such as an ultraviolet curable resin or a thermosetting resin. A curing treatment such as ultraviolet ray irradiation or heat ray irradiation is applied to form an uneven pattern layer 4', and if necessary, a printed pattern layer 5 with an arbitrary pattern is provided, and an adhesive layer 6 is provided to transfer the uneven pattern. A possible thermal transfer material is obtained.

Next, the obtained thermal transfer material is superimposed on the transfer object 7 and bonded under heat and pressure, and then the base sheet is peeled off, so that an uneven pattern can be transferred onto the surface of the transfer object 7.

Furthermore, if an adhesive is applied to the surface of the transfer target 7, it goes without saying that a thermal transfer material without the adhesive layer 6 described above can be used.

The specific layer structure of the thermal transfer material of the present invention includes (a) a release layer, a pattern layer containing a curing modifier, and an uneven pattern formed by the curing modifier and curable resin contained in the pattern; A thermal transfer material comprising a transfer layer consisting of an uneven pattern layer and an adhesive layer provided on a base sheet, (b) a release layer, a pattern layer containing a hardening modifier, a printed pattern layer, and a hardening modifier contained in the pattern layer. A thermal transfer material comprising a transfer layer formed of a concavo-convex pattern layer formed with a concavo-convex pattern by a curable resin and an adhesive layer on a base sheet, a release layer, a pattern layer containing a curing regulator, and the pattern layer. A thermal transfer material comprising, on a base sheet, a transfer layer such as a concave-convex pattern layer, a printed pattern layer, and an adhesive layer in which a concave-convex pattern is formed by a curing regulator and a curable resin contained in the above 0). A thermal transfer material that does not have an adhesive layer in the layer structure, (e) A thermal transfer material that does not have an adhesive layer in the layer structure of 0), (f) A thermal transfer material that does not have an adhesive layer in the layer structure of (c) above. Examples include thermal transfer materials.

Among the layer structures of these thermal transfer materials, especially those in (c) and (f), after transfer, the uneven pattern layer made of a curable resin also serves as a protective layer for the printed pattern layer. It has particularly excellent physical properties.

The base sheet 1 that can be used in the present invention includes polyethylene terephthalate, polycarbonate, polyamide,
Synthetic or semi-synthetic polymers such as polypropylene, polyethylene, cellulose acetate, and paper treated with release treatment can be used.

As the mold release layer 2, the above-mentioned base material is selected from among thermoplastic resins such as polymethacrylic acid ester, polyvinyl chloride, chlorinated rubber, polyvinylidene chloride, acrylonitrile styrene copolymer, polystyrene, and acrylonitrile-bucdiene-styrene copolymer. A material having good releasability during heat transfer from the sheet 1 can be appropriately selected and used.

As the curing regulator used in the present invention, both a curing inhibitor and a curing accelerator can be used.

Examples of these curing inhibitors include polymerization inhibitors such as hydroquinone, P-benzoquinone, and P-tertbutylcategol, and rubber vulcanization accelerators such as tetramethylthiuram monosulfide and tetramethylthiuram disulfide.

Next, as hardening accelerators, peroxides such as methyl ethyl ketone peroxide, benzoyl peroxide, and cumene hydroperoxide, metal soaps such as cobalt octenoate, cobalt naphthenate, and lead naphthenate, and benzoin, benzoin ether, and benzoin ester, etc. Ultraviolet curing agents such as benzoin derivatives, benzophenone, acetophenone, diphenyl disulfide, tesylallyl sulfide, benzyl, anthraquinone, naphthoquinone, chlornaphthoquinone, azobisisobutyronitrile, benzoyl peroxide, and the like.

These hardening modifiers are dispersed or dissolved in colored or colorless printing ink and printed in a pattern corresponding to an arbitrary uneven pattern.

Then, the part where a curable resin such as an ultraviolet curable resin or a thermosetting resin is applied, which corresponds to the part printed with the ink containing the curing inhibitor, is inhibited from curing and becomes concave, and also contains a curing accelerator. The area where a curable resin such as an ultraviolet curable resin or a thermosetting resin is applied, which corresponds to the area printed with ink, accelerates curing and becomes convex. When forming an uneven pattern on a coating layer of a curable resin such as a thermosetting resin, the degree of crosslinking is significantly different between the concave and convex parts of the uneven pattern layer9, and the uneven pattern becomes sharper on the surface of the transferred object during thermocompression bonding. can be transcribed.

The curable resin used in the present invention is ultraviolet light.

Examples include curable resins, thermosetting resins, ultraviolet curing and thermosetting resins, and more specifically, radical polymerization of unsaturated polyester resins, acrylic urethane resins, epoxy-modified acrylic resins, epoxy-modified unsaturated polyester resins, etc. Polymer resins, etc. can be mentioned.

These curable resins can also be used in various combinations depending on the curing treatment method.

As explained above, the thermal transfer material of the present invention has an uneven pattern formed on the coating layer of a curable resin such as an ultraviolet curable resin or a thermosetting resin that corresponds to the pattern of the ink containing a curing regulator on the surface of the transferred object. Since it is reproduced, the registration of the uneven pattern and the colored pattern is completely consistent.

Furthermore, since the transfer layer has an uneven pattern layer made of a curable resin such as an ultraviolet curable resin or a thermosetting resin as a component of the transfer layer, it is possible to form an uneven pattern with a uniform thickness on the surface of the transferred object. It has excellent effects such as being able to provide a cured resin layer with a hardened resin layer, easily providing a concavo-convex pattern layer even on a three-dimensional transfer object, and eliminating the need for an ultraviolet curing device or heat ray curing device at the time of transfer. Therefore, it is extremely useful industrially.

Further, the thermal transfer material of the present invention can be stored as is for a long period of time, and it is convenient in that it can be easily thermally transferred to an object to be transferred at the time of use.

Example 1 On one side of a polyester film (25μ thick), a release layer was provided by coating the composition (a) below, and then characters were gravure printed with a colored ink containing a curing inhibitor of the composition (b) below. After that, an ultraviolet curable paint with the following composition (c) was applied to a thickness of 50μ using a reverse roll coater, and then a concavo-convex pattern layer was formed by irradiating it with a 28W/cfrL mercury lamp for 30 seconds. After further printing white gravure ink on the entire surface, a thermoplastic acrylic resin adhesive was applied on the entire surface to obtain a thermal transfer material capable of transferring an uneven pattern.

The thermal transfer material is applied to a styrene molded product at a temperature of 230°C.
When the film was thermally transferred using a heated roller at a speed of 7'2/sec and the film was removed, a pattern was created in which the text was black with concave areas and the other areas were white with convex areas.

Example 2 A release layer was provided on one side of a polyester film (25μ thick) by coating the composition (A) above, and then a striped pattern was printed using a colored ink (with the following composition) containing a curing inhibitor. After further printing yellow ink on the entire surface, an ultraviolet curable paint with the following composition (e) was applied to a thickness of 50μ using a reverse roll coder, and then 80W/
A thermal transfer material capable of transferring an uneven pattern was obtained by irradiating the material with a cIrL mercury lamp for 2 seconds.

The thermal transfer material was superimposed on an aluminum plate coated with PVC/vinyl acetate/maleic acid copolymer resin, and heated at a temperature of 230°C for 2 hours.
When the film was removed by heating and pressing for 0 seconds, an aluminum decorative board was obtained in which the black part was concave and the yellow part was convex.

Example 3 After gravure printing a floral pattern on one side of cellophane (44μ thick) with an ink containing a curing accelerator having the following composition,
The following group! The thermosetting paint ()) was applied to a thickness of 40 μm using a percoater, and then irradiated with an infrared lamp for 2 minutes to bring the surface temperature to 80°C to form an uneven pattern layer. After printing pale yellow gravure ink on the entire surface, an adhesive layer made of thermoplastic urethane resin and acrylic resin was provided on the entire surface to obtain a thermal transfer material capable of transferring an uneven pattern.

The thermal transfer material is superimposed on a TV cabinet made of acrylonitrile-butadiene-styrene copolymer, and 2
When the cellophane was thermally transferred at a temperature of 30° C. at a speed of 10 c11 L/sec and the cellophane was peeled off, a television cabinet with a transferred pattern of convex and convex flower patterns was obtained.

The surface properties of the television cabinet were extremely excellent.

[Brief explanation of the drawing]

FIGS. 1, 2, and 5 are cross-sectional views of the thermal transfer material capable of transferring an uneven pattern according to the present invention during the manufacturing process. 3 and 6 are cross-sectional views of a thermal transfer material capable of transferring an uneven pattern according to the present invention. FIG. 4 is a cross-sectional view of a state in which the thermal transfer material capable of transferring an uneven pattern of the present invention is transferred to a transfer target. In the figure, 1 is a base sheet, 2 is a release layer, 3 is a pattern layer containing a curing inhibitor, 3' is a pattern layer containing a curing accelerator,
4 is a curable resin layer, 4' is an uneven pattern layer, 5 is a cutting pattern layer, 6 is an adhesive layer, and 7 is a transfer target.

Claims (1)

[Scope of Claims] 1. A transfer layer having an uneven pattern layer formed with an uneven pattern by an ink containing a hardening regulator and a curable resin is provided on a release-treated base sheet. A thermal transfer material with an uneven pattern that can be transferred. 2. Consisting of a release layer, an ink layer containing a curing modifier, a concavo-convex pattern layer in which a concavo-convex pattern is formed by the curing modifier and curable resin contained in the ink layer, and an adhesive layer on a base sheet. A thermal transfer material capable of transferring an uneven pattern, characterized by being provided with a transfer layer. 3. On a base sheet, a release layer, an ink layer containing a hardening modifier, a printed pattern layer, an uneven pattern layer in which a rough pattern is formed by the hardening modifier and curable resin contained in the ink layer, and A thermal transfer material capable of transferring an uneven pattern, characterized by having a transfer layer made of an adhesive layer. 4. On the base sheet, a release layer, an ink layer containing a hardening modifier, an uneven pattern layer in which an uneven pattern is formed by the hardening modifier and curable resin contained in the ink layer, a printed pattern layer, and an adhesive layer. A thermal transfer material capable of transferring an uneven pattern, characterized by being provided with a transfer layer consisting of: