JPH0739231B2 - Transfer sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a transfer sheet used for forming a pattern such as a wood grain pattern on a product surface by a transfer method.

[Problems to be Solved by Prior Art and Invention]

A transfer sheet is used to form, for example, a wood grain pattern on a product surface by a transfer method, and as this seed transfer sheet, a transfer layer having a pattern layer such as a wood grain pattern has been used,
It is known that the transfer layer is composed of a base material which is peeled off after being transferred to a product, and a release layer which is provided between the base material and the transfer layer as required.

However, the releasability between the transfer layer and the base material in the above-mentioned conventional transfer sheet is determined by the material of the base material and the material of the transfer layer, and if the releasability becomes too light due to the combination of both, burrs are likely to occur during transfer. There is a problem that it becomes difficult to peel the substrate if the peelability becomes too heavy,
How to control the releasability between the base material and the transfer layer in the transfer sheet has been an issue.

[Means for solving problems]

The present inventors have conducted extensive studies in view of the above points, and as a result, provided a peelability adjusting layer made of a resin obtained by mixing an acrylic resin and a melamine resin at a specific ratio between the transfer layer and the base material. The inventors have found that the releasability can be adjusted appropriately by changing the combination of the acrylic resin and the melamine resin, and completed the present invention.

That is, the present invention, a substrate made of a plastic film,
A transfer layer having a surface protective layer made of an ionizing radiation-curable resin, provided between the substrate and the surface protective layer in the transfer layer, the acrylic resin 10 to 90 parts by weight and the melamine resin 90.
It is composed of a mixed resin of 10 to 10 parts by weight, and the mixing ratio of the acrylic resin and the melamine resin is adjusted according to the material of the base material and the surface protective layer in the transfer layer, and the releasability between the base material and the transfer layer A transfer sheet is characterized in that it comprises a releasability adjusting layer configured to adjust.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a transfer sheet of the present invention, 1 is a substrate, 2 is a transfer layer, 2 is a transfer layer, 2 is a pattern layer, 3 is an adhesive layer, and 4 is a transfer target. And a surface protective layer 5 provided to protect the picture layer 3 of
Is laminated on the pattern layer 3 via a primer layer 6 for improving the adhesiveness with the pattern layer 3. A peelability adjusting layer 7 is provided between the base material 1 and the transfer layer 2 to adjust the peelability of the transfer layer 2 from the base material 1.

As the base material 1, polyester such as polyethylene terephthalate, polyolefin subjected to surface activation treatment such as corona treatment, for example, a film made of polyethylene, polypropylene or the like and having a thickness of about 10 to 100 is used.
Among them, polyester film is preferable, usually 12 to 10
A polyethylene terephthalate film having a thickness of 0 μ, particularly preferably 25 to 75 μ, is used.

The pattern layer 3 is provided with arbitrary coloring, patterns, characters and the like. The pattern layer 3 can be formed by a printing method such as gravure printing or silk screen printing, and as a printing ink, a usual printing ink is used, but an acrylic ink is particularly preferable.

The adhesive layer 4 is provided as necessary in order to improve the adhesiveness between the transferred product and the pattern layer 3, and the adhesive constituting the adhesive layer 4 is an acrylic adhesive, vinyl chloride /
Vinyl acetate copolymer adhesive, polystyrene adhesive,
Adhesives such as ethylene / vinyl acetate copolymer-based adhesives and rubber-based adhesives can be mentioned, but acrylic adhesives are preferable.

The surface protective layer 5 is composed 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;
Examples thereof include one or a mixture of two or more of methacrylates such as polyester methacrylate, 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, such as styrene or α-
Styrene-based monomers such as methylstyrene; acrylic acid esters such as methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, butoxyethyl acrylate, butyl acrylate, methoxybutyl acrylate, phenyl acrylate; methacrylic acid Methacrylic acid esters such as methyl, ethyl methacrylate, propyl methacrylate, methoxyethyl methacrylate, ethoxymethyl methacrylate, phenyl methacrylate, and lauryl methacrylate; unsaturated carboxylic acid amides such as acrylamide and methacrylamide; acrylic acid-2 − (N, N−
Dimethylamino) ethyl, 2- (N, N-dibenzylamino) ethyl acrylate, (N, N-dimethylamino) methyl methacrylate, 2- (N, N-dimethylamino) propyl acrylate, etc. Substituted amino alcohol esters of saturated acids; ethylene glycol diacrylate, propylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, Polyfunctional compounds such as ethylene glycol dimethacrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate;
Polyfunctional thiols such as trimethylolpropane trithioglycolate, trimethylolpropane trithiopropionate, and pentaerythritol tetrathioglycolate, etc., which may be used alone or in admixture of two or more. You can

As the ultraviolet curable resin, those obtained by adding a photoinitiator which generates a radical by ultraviolet irradiation such as benzoin ethers, halogenated acetophenones, benzophenones and diacetyls to the above electron beam curable resin are used.

The primer layer 6 is selected from materials that can improve the adhesion between the pattern layer 3 and the surface protective layer 5 according to the material of the pattern layer 3 and the surface protective layer 5, and is used as a primer for the primer layer 6. Examples include acrylic resin primer, vinyl chloride / vinyl acetate copolymer resin primer, polystyrene resin primer, rubber primer, and the like. The pattern layer 3 made of acrylic ink
In the case of improving the adhesiveness between the surface protection layer 5 made of an ionizing radiation curable resin and the surface protection layer 5, it is preferable to use an acrylic primer for the primer layer 6.

The peelability adjusting layer 7 for controlling the peelability between the substrate 1 and the transfer layer 2 is made of a mixed resin of an acrylic resin and a melamine resin. The compounding ratio of the acrylic resin and the melamine resin in the peelability adjusting layer 7 is 10 to 90 for the acrylic resin.
By weight, the melamine-based resin is 90 to 10 parts by weight. When the amount of the acrylic resin is large, the peeling property becomes heavy, and when the amount of the melamine-based resin is large, the peeling property becomes light. The degree of releasability of the transfer layer 2 can be adjusted by adjusting the mixing ratio of the acrylic resin and the melamine resin according to the material (the material of the surface protective layer 5 in the above-mentioned examples). Examples of the acrylic resin include acrylic resins obtained by copolymerizing a functional monomer, for example, Mitsubishi Rayon's Dianal HR606, Toray's Cotax SA107-302, Dainippon Ink & Co., Inc.
Products such as A405 to 409 are used. Examples of the melamine-based resin include butanol-modified or methanol-modified melamine-based resin.For example, as butylated melamine resin, Mitsui Toatsu's Uban 20SB and Hitachi Chemical's Melan 24
As a methylated melamine resin, Cymel manufactured by Mitsui Toatsu
325, DIC L-105-60 and the like.

The transfer sheet can be manufactured by sequentially laminating the peeling adjustment layer 7, the surface protective layer 5, the primer layer 6, the pattern layer 3, and the adhesive layer 4 on the base material 1. The peeling adjustment layer 7 As a method for forming the surface protective layer 5, the primer layer 6, and the adhesive layer 4, a coating method such as roll coating or gravure coating is adopted. When the surface protective layer 5 is made of an ionizing radiation curable resin, it is preferable to coat the primer layer 6 and then irradiate it with an electron beam, ultraviolet ray or the like to cure the ionizing radiation curable resin, thereby improving workability.

Examples of the transfer method using the transfer sheet of the present invention include a method of transferring the transfer layer onto the surface of the transferred product by superimposing it on the surface of the transferred product by heating and pressurizing it, or by laying it in the injection mold in advance and then injection-forming it. It is possible to employ a method such as peeling the base material to obtain an injection-molded article with the transfer layer transferred.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

Example 1 A mixed resin (manufactured by Daiji Seika: EX114D manufactured by Daiji Seika: EX114D) having a base material of 38 μm thick polyethylene terephthalate film (Diawheel: G type) and containing acrylic resin and melamine resin at a ratio of 2: 1 on one side thereof. ) Is applied to a thickness of 0.5 μ by a gravure coater, a polyester acrylate electron beam curable resin is applied thereon to a thickness of 3 μ by a roll coater, and an acrylic resin primer ( Mitsubishi Rayon Co., Ltd .: MHO solvent solution) was applied to a thickness of 1 μ using a gravure coater, and then an electron beam with an irradiation dose of 5 Mrad was applied.
The electron beam curable resin was cured by irradiation at a speed of 0 m / min. After that, gravure printing is performed using acrylic ink (Showa Ink: GG) on the primer layer to form a pattern layer, and an acrylic ink for adhesive layer formation (Showa Ink: HS32) was applied with a gravure coater to a thickness of 2 μm to form an adhesive layer to obtain a transfer sheet. After the transfer sheet was laid in an injection molding die and the acrylic resin was injection-molded, the base material was peeled off to obtain good releasability, and the base material was easily peeled off. Was not recognized. Further, when a resin (acrylic resin: melamine resin = 1: 5) having a large amount of melamine component was used for forming the peelability adjusting layer (Dainichi Seika's EX114J), the peelability was further reduced.

Comparative Example 1 A transfer sheet having the same configuration as in Example 1 except that the peelability adjusting layer was not provided was used, and after the same formation as in Example 1 was performed, the base material was peeled off to obtain a molded product. In the aspect, the electron beam curable resin and the base material were integrated, and it was extremely difficult to peel the base material.

Comparative Example 2 The peelability adjusting layer was made of acrylic resin: melamine resin = 0.5:
A transfer sheet having the same structure as in Example 1 except that it was made of a resin of 9.5 was used, and after the same formation as in Example 1 was performed, the base material was peeled off. Although it could be peeled off, significant burrs were observed at the parting part of the molded product.

〔The invention's effect〕

As described above, the transfer sheet of the present invention is a release layer composed of a mixed resin having a ratio of acrylic resin 10 to 90 parts by weight and melamine resin 90 to 10 parts by weight between the surface protective layer and the base material in the transfer layer. A property adjusting layer is provided, and by adjusting the mixing ratio of the acrylic resin and the melamine resin, the releasability between the base material and the transfer layer is appropriately adjusted according to the materials of the base material and the surface protective layer in the transfer layer. It is possible to prevent the occurrence of burrs due to poor peeling of the base material or too light peelability.

[Brief description of drawings]

The drawings show examples of the present invention, and FIG. 1 is a longitudinal sectional view showing one embodiment of the transfer sheet of the present invention. 1 ... Substrate, 2 ... Transfer layer 7 ... Peelability adjusting layer

Claims (5)

[Claims] 1. An acrylic resin 10 which is provided between a base material made of a plastic film, a transfer layer having a surface protective layer made of an ionizing radiation curable resin, and the base material and the surface protective layer in the transfer layer. ~ 90 parts by weight and melamine resin 90 ~
It is composed of a mixed resin with 10 parts by weight, and adjusts the mixing ratio of the acrylic resin and the melamine resin according to the material of the surface protection layer in the base material and the transfer layer to improve the releasability between the base material and the transfer layer. A transfer sheet comprising a peelability adjusting layer configured to be adjusted. 2. The transfer sheet according to claim 1, wherein the transfer layer comprises an adhesive layer, a pattern layer, and a surface protective layer for protecting the pattern layer after transfer. 3. The transfer sheet according to claim 1, wherein the ionizing radiation curable resin is an electron beam curable resin. 4. The transfer sheet according to claim 1, wherein the ionizing radiation curable resin is an ultraviolet curable resin. 5. The transfer sheet according to claim 1, wherein the base material is a polyester resin.