JPH0924699A - Transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer sheet having an excellent stickiness of a surface protective layer provided to protect a design layer surface after it is transferred to a product to be transferred to the design layer, difficulty of releasing of the protective layer even if the protective layer is rubbed and excellent protective properties of the design layer. SOLUTION: The transfer sheet comprises a transfer layer 2 having a design layer 3 and a surface protective layer 5 for protecting the surface of the layer 3 and provided on a base material 1, wherein the layer 5 is formed of ionizing radiation curable resin cured material, and a primer layer 6 for improving the stickiness between the layer 5 and the layer 3 is provided between the layer 5 and the layer 3.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a transfer sheet.

[0002]

2. Description of the Related Art A transfer sheet is used to form, for example, a wood grain pattern on a product surface by a transfer method.
There is known a configuration in which, for example, a transfer layer is provided by sequentially laminating a surface protective layer, a picture layer formed with a grain pattern or the like, and an adhesive layer as necessary on a base material.

[0003] The surface protection layer in the transfer layer is located on the surface side of the picture layer to protect the picture layer after the transfer layer is transferred to the product surface, and is made of an electron beam curable resin or an ultraviolet curable resin. It is configured.

Since the surface protective layer is located on the surface side of the product as described above, it is susceptible to friction and the like, and if the surface protective layer peels off from the pattern layer due to friction and the like, the pattern layer may be damaged. Was.

[0005] The present invention has been made in view of the above points,
It is an object of the present invention to provide a transfer sheet having improved adhesion between a surface protective layer and a picture layer.

[0006]

That is, the transfer sheet of the present invention is a transfer sheet in which a transfer layer having a pattern layer and a surface protective layer for protecting the surface of the pattern layer is provided on a substrate. The surface protective layer is formed of a cured product of an ionizing radiation curable resin, and a primer layer for improving adhesion between the surface protective layer and the pattern layer is provided between the surface protective layer and the pattern layer. Is characterized by.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The transfer sheet of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a transfer sheet according to the present invention, wherein 1 is a substrate, 2 is a transfer layer, and the transfer layer 2 is a picture layer 3.
And an adhesive layer 4 and a surface protective layer for protecting the picture layer 3 after being transferred to the transferred product.
Is laminated on the pattern layer 3 via a primer layer 6 for improving the adhesiveness with the pattern layer 3.

As the substrate 1, a film having a thickness of about 10 to 100 μm made of a polyester such as polyethylene terephthalate, a polyolefin subjected to a surface activation treatment such as a corona treatment, for example, polyethylene, polypropylene or the like is used. Polyester film is preferred, usually 12-100μ, particularly preferably 25-7.
A 5μ polyethylene terephthalate film is used.

The pattern layer 3 is given an arbitrary color, pattern, character, or the like. The picture layer 3 can be formed by a printing method such as gravure printing or silk screen printing. As the ink for forming the pattern layer 3, a usual printing ink is used, but an acrylic ink is particularly preferable.

The surface protective layer 5 is made of an ionizing radiation-curable resin such as an electron beam-curable resin or an ultraviolet-curable resin. Examples of the electron beam curable resin include prepolymers having an ethylenically unsaturated bond, and examples thereof include acrylates such as unsaturated polyester, polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate; polyester methacrylate. ,
Examples thereof include one or a mixture of two or more of methacrylates such as epoxy methacrylate, urethane methacrylate, polyether methacrylate, polyol methacrylate, and melamine methacrylate. Further, it is also possible to use those prepolymers to which a reactive diluent that plays a role of adjusting the viscosity and the physical properties of the cured film is added.

The reactive diluent is a compound having an ethylenically unsaturated bond or a thiol, for example, a styrene monomer such as styrene or α-methylstyrene; methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate Acrylates such as butoxyethyl acrylate, butyl acrylate, methoxybutyl acrylate, phenyl acrylate; methyl methacrylate, ethyl methacrylate, propyl methacrylate, methoxyethyl methacrylate, ethoxymethyl methacrylate, ethoxymethyl methacrylate, phenyl methacrylate , Methacrylic esters such as lauryl methacrylate; unsaturated carboxylic amides such as acrylamide and methacrylamide; acrylic acid-2-
(N, N-dimethylamino) ethyl, acrylic acid-2-
(N, N-dibenzylamino) ethyl, (N, N-dimethylamino) methyl methacrylate, acrylic acid-2-
Substituted amino alcohol esters of unsaturated acids such as (N, N-diethylamino) propyl; ethylene glycol diacrylate, propylene glycol diacrylate,
Polyfunctionality such as neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate Compounds: polyfunctional thiols such as trimethylolpropane trithioglycolate, trimethylolpropane trithiopropionate, and pentaerythritol tetrathioglycolate, and the like. These may be used alone or as a mixture of two or more as needed. Can be used.

As the UV-curable resin, there is used a resin obtained by adding a photoinitiator such as benzoin ethers, halogenated acetophenones, benzophenones, and diacetyls to the electron beam-curable resin, which generates radicals upon irradiation with ultraviolet rays.

The primer layer 6 is a pattern layer 3 and a surface protective layer 5.
A material that can improve the adhesion between the pattern layer 3 and the surface protection layer 5 is selected and used according to the material of the above. The primer used for the primer layer 6 is, for example, an acrylic resin-based primer or vinyl chloride / acetic acid. Examples thereof include a vinyl copolymer resin-based primer, a polystyrene resin-based primer, and a rubber-based primer. When the pattern layer 3 is made of acrylic ink, the pattern layer 3 and the surface protection layer 5 made of an ionizing radiation curable resin are used. In order to improve the adhesiveness, it is preferable to use an acrylic resin-based primer for the primer layer 6.

Between the substrate 1 and the transfer layer 2, there is provided a releasability adjusting layer 7 for adjusting the releasability of the transfer layer 2 from the substrate 1. The releasability between the substrate 1 and the transfer layer 2 is determined by the material of the substrate 1 and the transfer layer 2 (the material of the surface protection layer 5 in the example of FIG. 1), and the releasability becomes too light by a combination of both. And burrs are likely to occur during transfer,
If the releasability is too heavy, the substrate 1 is difficult to peel. The releasability adjusting layer 7 is composed of a mixture of an acrylic resin and a melamine resin, and the releasability of the transfer layer 2 is adjusted according to the materials of the base material 1 and the transfer layer 2 by adjusting the mixing ratio of the two. can do. The mixing ratio of the acrylic resin and the melamine resin is preferably 10 to 90 parts by weight of the acrylic resin and 90 to 10 parts by weight of the melamine resin.
When the amount of the acrylic resin increases, the releasability increases, and when the amount of the melamine resin increases, the releasability decreases.

Examples of the acrylic resin include acrylic resins obtained by copolymerizing a functional monomer. Examples thereof include Mitsubishi Rayon's Dianal HR606, Toray's Cotax SA107-302, and Dainippon Ink's Acrydec A405-409. And other products are used. Examples of the melamine-based resin include butanol-modified or methanol-modified melamine-based resin. Examples of the butylated melamine resin include Uban 20SB manufactured by Mitsui Toatsu, Melan 24 manufactured by Hitachi Chemical, and the methylated melamine resin manufactured by Mitsui Toatsu. Cymel 325, DIC L-105-60
And the like.

An adhesive layer 4 is provided on the transfer layer 2 on the picture layer 3 side, if necessary, in order to improve the adhesion between the transferred product and the picture layer 3. Examples of the adhesive constituting the adhesive layer 4 include acrylic adhesives, vinyl chloride / vinyl acetate copolymer adhesives, polystyrene adhesives, ethylene / vinyl acetate copolymer adhesives, and rubber adhesives. But an acrylic adhesive is preferable.

The above transfer sheet can be manufactured by sequentially laminating a release control layer 7, a surface protective layer 5, a primer layer 6, a picture layer 3, and an adhesive layer 4 on a substrate 1. Property adjusting layer 7, surface protective layer 5, primer layer 6,
As a method for forming the adhesive layer 4, a coating method such as roll coating or gravure coating is employed. It is preferable that the ionizing radiation-curable resin forming the surface protective layer 5 be cured by irradiating the primer layer 6 with an electron beam, an ultraviolet ray, or the like after application to the primer layer 6 because the workability is improved.

In the transfer method using the transfer sheet of the present invention, the transfer sheet of the present invention is superimposed on the surface of the product to be transferred, heated and pressed, the substrate 1 is peeled off, and the transfer layer 2 is transferred to the surface of the product to be transferred. Or a method in which the transfer sheet of the present invention is laid beforehand in an injection mold and then injection-molded, and then the substrate 1 is peeled off to obtain an injection-molded article on which the transfer layer 2 has been transferred. Can be.

[0020]

EXAMPLES The present invention will be described in more detail with reference to specific examples.

Example 1 A mixed resin (manufactured by DAINICHI SEIKA CORPORATION) containing a polyethylene terephthalate film (manufactured by DiaWheel: G type) having a thickness of 38 μ as a base material and containing an acrylic resin and a melamine resin in a ratio of 2: 1 on one surface thereof : EX114D) was applied to a thickness of 0.5 μm with a gravure coater, and a polyester acrylate-based electron beam curable resin was applied thereon to a thickness of 3 μm with a roll coater, and an acrylic resin-based resin was further applied thereon. (Mitsubishi Rayon Co., Ltd .: MHO solvent solution) is applied to a thickness of 1 μm using a gravure coater, and an electron beam of an irradiation dose of 5 Mrad is irradiated at a speed of 10 m / min. Was cured.

Then, a gravure printing is performed from above the primer layer using an acrylic ink (manufactured by Showa Ink: GG) to form a pattern layer, and an acrylic ink for forming an adhesive layer (Showa Ink) is further formed on the pattern layer. (Manufactured by: HS32) was applied by a gravure coater to a thickness of 2 μm to form an adhesive layer to obtain a transfer sheet. After laying this transfer sheet in an injection mold and injection molding an acrylic resin, the base material was peeled off, and good peelability was obtained. No outbreak was observed. In addition, a resin containing a large amount of melamine component (acrylic resin: melamine resin = 1: 5) for forming a peeling property adjusting layer (E: manufactured by Dainichi Seika: E
X114J), the releasability was further reduced.

Comparative Example 1 A transfer sheet having the same structure as in Example 1 except that the release property adjusting layer was not provided was used, and the same molding as in Example 1 was performed. The electron beam curable resin and the base material were integrated at the curved surface of the product, and it was extremely difficult to peel the base material.

Comparative Example 2 An acrylic resin: melamine resin = 0.
Using a transfer sheet having the same configuration as in Example 1 except that the transfer sheet was made of a resin having a ratio of 5: 9.5, the same molding as in Example 1 was performed, and then the substrate was peeled off. Although the substrate could be easily peeled off, remarkable burrs were observed at the parting part of the molded product.

[0025]

As described above, the transfer sheet of the present invention comprises a pattern layer and a surface protective layer formed of a cured product of an ionizing radiation curable resin, which is provided to protect the pattern layer after transfer. By providing the primer layer, the adhesiveness between the surface protective layer and the pattern layer is improved. As a result, even if the surface protective layer is rubbed after the transfer layer is transferred to the product to be transferred, the surface protective layer is hardly peeled off, and the surface protective layer has the effect of protecting the surface of the picture layer.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a transfer sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Transfer layer 3 Pattern layer 5 Surface protective layer 6 Primer layer 7 Releasability adjusting layer

Claims (4)

[Claims] 1. A transfer sheet comprising a transfer layer having a pattern layer and a surface protective layer for protecting the surface of the pattern layer provided on a substrate, wherein the surface protective layer is a cured product of an ionizing radiation curable resin. And a primer layer for improving the adhesion between the surface protective layer and the picture layer between the surface protective layer and the picture layer. 2. The transfer sheet according to claim 1, wherein the pattern layer is made of an acrylic ink and the primer layer is made of an acrylic resin primer. 3. The transfer sheet according to claim 1, which has a peelability adjusting layer between the base material and the transfer layer. 4. The peelability adjusting layer comprises acrylic resin 10-9.
The transfer sheet according to claim 3, which comprises a mixed resin of 0 parts by weight and 90 to 10 parts by weight of a melamine resin.