JPH06255299A - Transfer film - Google Patents

Abstract

PURPOSE:To provide a transfer film having an uneven pattern in which printing with much gradation containing halftone is completely executed. CONSTITUTION:An uneven pattern layer 2 of ionizing radiation curable resin to be formed of a straight line group or/and a curve group not crossed and drawn in a closed curve region provided with a plurality of closed curves is provided on one side surface of a base material film 1, and a peeling layer 3, a pattern layer 4, a colored or noncolored resin layer 5 and an adhesive layer 6 are provided thereon. A depth 25 of the uneven pattern is 2-13mum, and its width 26 is 5-25 times as large as the depth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer film, and more specifically, it has a three-dimensional effect, a gloss change, and a concavo-convex pattern excellent in design effect, in which a pattern having a print pattern rich in gradation is formed. The present invention relates to a transfer film having a pattern.

[0002]

2. Description of the Related Art Conventionally, the makeup of molded products used in light electrical appliances, cosmetic containers, building material members, etc. can be produced by a transfer film in which a desired design is formed on a base sheet which is a material that is easy to print. The pattern of the transfer film was transferred onto the surface of the molded product. Then, the transfer film having a three-dimensional effect in the pattern layer has a hairline pattern for providing linear recesses by cutting, a spin pattern, an uneven pattern by printing, and an uneven pattern by embossing on the surface of the substrate sheet.
On top of that, a peeling layer, a pattern layer and an adhesive layer were used. (See, for example, Japanese Patent Application Laid-Open Nos. 2-63900 and 3-199082.) Such a pattern composed of the transfer film is reproduced by being combined with the concavo-convex pattern provided on the base sheet. The surface gloss varied in various ways, and it looked three-dimensional.

[0003]

However, in the transfer film of the prior art, when printing is performed on the concavo-convex pattern layer, particularly when the film to be printed is subjected to gravure printing in which the smoothness is required, the ink drop (the pattern is There was a problem that a non-printed white part was generated. Therefore, printing with rich gradations including highlights and parts such as wood grain, stone pattern, and abstract pattern that mimics natural products has a problem that high-level printing cannot be performed completely due to voids in recesses.

When a pattern rich in gradation is gravure-printed on the concave surface of the concave-convex pattern layer, if the depth of the concave portion exceeds 13 μm, the ink does not reach the bottom of the concave portion. Therefore, the pattern expected in the original could not be completely reproduced in the concave portion. In particular, the pattern in the highlight part where the gravure plate is shallow has remarkable ink leakage,
It was not suitable for photographic printing.

The term "gradation" as used in the present invention refers to a step of density from a highlight portion (a portion having a small ink transfer amount) to a shadow portion (a portion having a large ink transfer amount) of an image. . The "gradient rich pattern" refers to a pattern in which the density (transfer amount) of the ink is rich in changes from the highlight part to the shadow part, like a photographic pattern. Therefore, when the surface to be printed is not smooth and has irregularities, ink is not transferred to the concave portions when the pattern printing of the highlight portion with a small amount of ink transfer is performed, and the ink drop 43 occurs. Particularly in gravure printing, this phenomenon is likely to occur, and thus the printing medium used for the printing is often required to have smoothness.

In the case of printing on a surface having a concave portion where ink bleeding appears, even if the width of the concave portion is widened, the ink does not reach the corner portion, so that the printing effect expected from the original document cannot be obtained and the problem can be solved. There wasn't. In addition, when the depth of the recesses in the transfer film is 2 μm or less, there is no ink bleeding in the highlight part, but in the transferred one, a line pattern that is an uneven pattern does not appear, and an optical image is formed. There was a problem not to do. It is an object of the present invention to provide a transfer film having a high design quality in which a gradation pattern and an embossed pattern are combined by gravure printing.

[0007]

In order to achieve the above-mentioned object, the transfer film of the present invention has a plurality of closed curve regions as shown in FIGS. On the upper surface of the uneven pattern layer of the ionizing radiation curable resin formed by an assembly of straight line groups or / and curved groups that do not intersect with each other, a release layer, a pattern layer, a colored or uncolored resin layer,
The adhesive layer is formed in order, and the depth of the concave portion in the concave-convex pattern layer is 2 to 13 μm, and the width thereof is 5 to 25 times the depth.

The concavo-convex pattern layer referred to in the present invention refers to FIGS.
It is formed from a pattern of precision lines as shown in. This pattern is a group of parallel straight lines 2 drawn in a closed curve region 22 surrounded by a plurality of closed curves 21.
3 and / or the curve group 24.
The depth of the concave portion 25 formed on the transfer film surface is 2 to 13 μm, and the width 26 thereof is 5 to 25 times the depth. If the width of the recess is less than 5 times the depth, the ink in the highlight portion will not reach the bottom of the recess, causing ink loss. Further, when it is 25 times or more, the transfer of the ink in the highlight portion is good, but the uneven pattern is poor in gloss change. The width 27 of the convex portion is determined by the precision and durability of the plate, but is 10 μm.
A value of m or more is suitable, and is finally determined by the design.

The base film that can be used is a single film or a laminated film composed of the following materials. Polyester resin such as polyethylene terephthalate,
A film or sheet formed from a polyamide resin such as 6-nylon, a polyvinyl chloride resin, an acrylic resin such as polymethylmethacrylate, a polypropylene resin, a cellulose derivative such as cellulose triacetate or cellophane. Metal foil such as copper, iron and aluminum. paper. A laminated sheet of the above film and resin.

The ionizing radiation curable resin is a known ultraviolet curable resin and electron beam curable resin, for example, a prepolymer having a polymerizable unsaturated bond or an epoxy group in the molecule, an oligomer and / or a monopolymer. The composition which mixed the monomer is mentioned. These prepolymers and oligomers include unsaturated polyesters that are condensation products of unsaturated dicarboxylic acids and polyhydric alcohols, methacrylates such as polyester methacrylate, acrylates such as epoxy acrylate, and the above-mentioned monomers. For example,
Styrene-based monomers such as styrene, acrylic acid esters such as 2-ethylhexyl acrylate, methacrylic acid esters such as lauryl methacrylate, acrylic acid-2-
Substituted amino alcohol esters of unsaturated acids such as (N, N-didiethylamino) propyl, polyfunctional compounds such as 1,6 hexanediol diacrylate, and / or polythiol compounds having two or more thiol groups in the molecule Examples include trimethylolpropane trithioglycolate and the like.

The monomer is the concave portion 1 of the drum printing apparatus shown in FIG.
When forming the concave-convex pattern in 2, select a material having excellent filling properties into the concave portion. For example, there are monofunctional acrylates such as phenoxyethyl acrylate, bifunctional acrylates such as 1,6 hexanediol, and trifunctional or higher functional acrylates such as dipentaerythritol hexaacrylate. Further, the above compound is added with a polymerization inhibitor such as hydroquinone monomethyl ether in order to prevent the compound from being cured before irradiation with ionizing radiation. Further, in order to cure these compositions with visible light or ultraviolet rays, acetophenones, a photopolymerization initiator of benzophenones, or
It becomes possible by adding a photosensitizer for amines.

Ionizing radiation is one of electromagnetic waves or charged particle beams that has the ability to ionize a substance. What is industrially used is visible light, ultraviolet light, or electron beam. Besides, X-rays, β-rays, etc. can also be used.

In the transfer film of the present invention, when a pattern rich in gradation is gravure-printed on an uneven surface formed from a precision line pattern, when the depth of the recess reaches 13 μm or more, the ink reaches the bottom of the recess. Since this is not done, this area will be the ink drain. In particular, the portion where the gravure plate expresses the highlight portion of a shallow picture pattern is not suitable for photographic printing because the ink is significantly removed. In this case, even if the width of the concave portion is widened, the ink does not reach the corner portion or the bottom portion, so that the printing effect expected from the original document cannot be obtained and the problem cannot be solved. Also, when the depth of the recess is 2 μm or less, there is no ink bleeding in the highlight portion, but in the transferred one,
There is a problem that a line pattern does not appear and an optical image is not formed.

In the present invention, as a result of earnest research to solve the above problems, the depth of the concave portion is 2 to 13 μm, and the width thereof is set to 2 to 25 times the depth, whereby the pattern 41 and the shadow portion are formed. It was found that an image in which all gradations of the pattern 42, which is a highlight portion, can be accurately reproduced can be printed.

A material and a coating method are selected in consideration that the peeling layer formed on the concavo-convex pattern layer serves as a protective film for an image after transfer and, at the same time, affects the gloss of the surface. The material is acrylic resin, polyvinyl chloride / vinyl acetate copolymer, fibrin derivative, chlorinated rubber, cyclized rubber, polyvinyl butyral, polyurethane, epoxy silicon resin, linear polyester resin, etc. Examples thereof include an antistatic agent for preventing, a varnish composed of wax for modifying the surface property, and the like.

When the release layer is applied, the recesses of the concavo-convex pattern layer are filled in, and at the same time, the printing surface is made smooth so that the next step, gravure printing, is suitable. The coating method therefor includes reverse coating such as gravure reverse and slit reverse, and direct coating with a rubber roll. It can also be performed in the same step with a gravure printing machine that prints a design.

The pattern layer is a vehicle made of a heat-resistant material that is not melted by heat during thermal transfer and does not deform the pattern. It is a normal ink that adheres to the release layer and is used in gravure printing or flexographic printing. Set up.

The resin layer provided on the upper surface of the pattern layer is composed of a transparent resin layer, a colored resin phase layer, or a metal vapor deposition layer containing a metal vapor deposition primer. These layers may be used alone or in combination. To form. The transparent resin layer has a function as a peeling-stabilizing layer when the transfer film is thermally transferred, and also has an effect of improving surface physical properties such as preventing the pattern layer of the transferred layer from collapsing. It also acts as a primer that stabilizes the gloss and adhesion of vapor deposition. In particular, the ionizing radiation-curable resin provided as a vapor deposition primer has a surface hardness and can form a vapor deposition film having high reflectance and high gloss. Further, the colored resin layer can also serve as a pattern layer having a high density.

This material is a homopolymer of an acrylic ester or a methacrylic ester, or a copolymer of these monomers, a styrene resin, a cellulose derivative, a derivative such as a rosin ester, a polyvinyl acetate resin, a vinyl chloride resin, Vinyl chloride / vinyl acetate copolymer, coumarone resin, vinyltoluene resin, polyvinyl butyral resin,
Polyurethane resin, polyester resin, shellac, gum arabic, acaloid, mastic, etc. may be used alone or in admixture of two or more.

For the colored layer, a material for the transparent colored layer is used in which a colorant such as an inorganic pigment, an organic pigment or a dye, and an extender pigment are contained. The coating method may be a usual method such as reverse coating such as gravure reverse or slit reverse, a direct coating with a rubber roll, or gravure printing or flexographic printing which is the same step as the pattern printing. The metal vapor deposition layer is made of a metal such as aluminum, tin, silver, copper, or chromium, and is 400 to 600 Å
It can be formed by vacuum vapor deposition.

The adhesive layer is a material for transferring and adhering the transfer layer to the transferred material. And, the same quality as the adhesive used for this type of transfer film can be used. For example, acrylic resin, styrene resin, polyvinyl chloride /
Examples thereof include vinyl acetate copolymer, polyvinyl butyral resin, polyurethane resin, epoxy resin derivative, polyester resin and the like.

[0022]

In the transfer film constructed as described above, the precision line pattern is made of ionizing radiation curable resin so that the concavo-convex pattern has a depth of 2 to 13 μm, and the width thereof is 5 to the depth.
Since it is constituted by 25 times, the peeling layer provided thereon has excellent smoothness, and gravure printing of a pattern rich in gradation can be performed. Therefore, it is possible to express a highly designable product by combining gradation patterns with natural products such as wood grain patterns and stone patterns, and combinations of abstract patterns and embossed patterns.

[0023]

EXAMPLES Next, examples of the transfer film in the present invention will be described. (Example) Polyethylene terephthalate film (Teijin Ltd.)
Manufacture: HP-7) 1 as a base material sheet, and a drum printing device shown in FIG.
As a result, an ultraviolet ray curable resin which is an ionizing radiation curable resin 13 is extruded onto the roll intaglio 11 to form a pressure roll 15.
Then, the resin was pressed into the recesses 12 of the plate and cured by a high pressure mercury lamp as a curing device 16 under the conditions of an output of 120 W / cm and an irradiation time of 13 seconds to form a film having an uneven pattern layer 2 shown in FIG. 1a. The roll intaglio used for this was directly placed on a cylinder whose surface layer was made of copper, having a depth of 12 μm and a recess width of 10 μm.
A line-shaped pattern having a width of 0 μm and a convex portion of 100 μm was formed. As the ultraviolet curable resin, Seika Beam EX-880926B manufactured by Dainichi Seika Co., Ltd. was used. A release layer (manufactured by Showa Ink Kogyo Co., Ltd.) 3 made of an acrylic resin as shown in FIG. 1 (b) is provided on the uneven surface 2 of the substrate sheet obtained in 1 above by gravure printing to a thickness of 2 μm,
Further, a gravure ink manufactured by the same company was used to form a stone pattern layer 4 shown in FIG. 1 (c). Heat-resistant varnish BC (manufactured by Showa Ink Industry Co., Ltd.) and acrylic heat-sensitive adhesive HS-2 on the printed surface 4 obtained in
(Manufactured by Showa Ink Industry Co., Ltd.) with a thickness of 2 μm
Was applied by gravure printing to provide the transparent colored resin layer 5 and the adhesive layer 6 shown in FIG. 1 (d) to obtain the transfer film of the present invention. Although the transfer film is gravure-printed on the upper surface of the uneven pattern layer, it is shown in FIG. 1 (d) not to mention the shadow pattern 41 shown in FIG. ) As shown in H, the pattern 42 in the highlight portion was reproduced, and there was no ink drop 43.
The uneven pattern after transfer was good, and the design was high. As shown in FIG. 2, the obtained transfer film is transferred onto a molded product of polystyrene-based synthetic resin ABS resin, which is the transferred substrate 7, at 200 ° C. under a roll condition of 2 m / min, and the substrate sheet is peeled off. did. As a result, AB
As the molded product of S resin, it was possible to obtain a product with a high design in which all gradations of the stone pattern were reproduced.

[0024]

As described above, the transfer film of the present invention is formed on one surface of the substrate sheet by a plurality of non-intersecting straight line groups and / or curved line groups drawn in a closed curve region. Release layer, a pattern layer, a colored or non-colored resin layer on the surface of the aggregate of the uneven pattern layer of the ionizing radiation curable resin,
It is composed of an adhesive layer, and the concave-convex pattern layer has a depth of 2 to 13 μm and a width of 5 to 25 times the depth of the concave, thereby obtaining a conventional transfer film having a simple concave-convex pattern. Compared with the design used, a design with high reproducibility of the highlight part and high design was obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a process of an embodiment of the present invention. (a) It is a conceptual diagram in which an uneven pattern layer is provided on a base film. (b) It is a conceptual diagram in which a release layer is provided on the uneven pattern layer. (c) It is a conceptual diagram including a pattern layer printed on the release layer surface. (d) FIG. 1 (c) is a conceptual diagram in which a resin layer and an adhesive layer are provided. (e) An enlarged conceptual view showing an ink transfer state in a concave portion. It is a conceptual diagram which expanded and showed the transfer state of the ink in the H highlight part. FIG. 5 is an enlarged conceptual diagram showing an ink transfer state in an S shadow portion.

FIG. 2 is a conceptual diagram when transfer is performed using the transfer film of the present invention.

FIG. 3 is a conceptual diagram showing inking in an ink transfer state of a highlight portion in a concave portion according to a conventional method.

FIG. 4 is an explanatory diagram showing a process of a drum printing device for forming a concavo-convex pattern layer on a base material sheet of the present invention.

FIG. 5 is an example of a concavo-convex pattern layer including straight lines and / or curved lines drawn in a plurality of closed curve regions.

6 is a conceptual diagram of a cross section showing a concavo-convex pattern of AA in FIG.

[Explanation of symbols]

 1 Base film 2 Concavo-convex pattern layer of ionizing radiation curable resin 21 Closed curve 22 Closed curve region 23 Lines of straight lines drawn in closed curve region 24 Lines of linear line drawn in closed curve region 25 Depth of concave and convex pattern 26 Width of concave / convex portions of convex / concave pattern 27 Width of convex portion of concave / convex pattern 3 Release layer 4 Pattern layer 41 Shadow portion pattern layer 42 Pattern layer of highlight portion 43 Ink drop portion formed in concave portion 5 Resin layer 6 Adhesive layer 7 Cover Transfer substrate 10 Ionizing radiation curable resin supply unit 11 Roll intaglio 12 Recessed portion 13 Ionizing radiation curable resin 15 Press roll 16 Curing device

Claims (1)

[Claims] 1. A substrate film having on one surface thereof a plurality of straight line groups not intersecting in a closed curve region or / and an uneven pattern layer of an ionizing radiation curable resin formed by the curved line groups, Further, a release layer, a pattern layer rich in gradation, a colored or non-colored resin layer, and an adhesive layer are sequentially formed on the upper surface of the uneven pattern layer, and the depth of the concave portion of the uneven pattern layer is 2
A transfer film having a width of ˜13 μm and a width of 5 to 25 times the depth.