JPH0632070A - Transfer sheet - Google Patents

Abstract

PURPOSE:To obtain a transfer sheet for forming a beautiful transfer layer having a high matte effect on a transfer medium and preventing a substrate sheet from being cut by a heat and a tension in a transferring process. CONSTITUTION:In a transfer sheet 1, a substrate sheet 4 whose surface serves as the mold release plane is made of a multi-layer sheet obtained by coextruding molten resins, and at least a resin layer 2 of the substrate sheet 4 in contacts with a transfer layer 8 is matte layer having a matte feeling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet which is used when forming a transfer layer on various materials to be transferred.

[0002]

2. Description of the Related Art A method of applying a decoration by transferring a transfer layer of a transfer sheet onto a surface of a substrate is used. The surface of a transfer sheet used for adding decoration by this transfer means is A base sheet that is a release surface,
And a transfer layer formed on the release surface of the base sheet.

As a transfer sheet from which a transfer layer having a matte surface can be obtained, (1) a base sheet made of a resin film containing a matting agent such as silica, and a transfer formed on the release surface of the base sheet. Transfer sheet consisting of a layer, and (2) a base sheet made of a resin film having a cured coating layer of thermosetting matte ink on the surface, and a transfer formed on the surface of the cured coating layer of the matte ink of the base sheet And (3) a base sheet made of a resin film whose surface is sandblasted, and a transfer sheet having a transfer layer formed on the sandblasted surface of the base sheet.

[0004]

In the above-mentioned conventional transfer sheet from which a transfer layer having a matte surface is obtained, (1)
In the case of using a base material sheet made of a resin film containing a matting agent such as silica, the content ratio of the matting agent in the resin film forming the base material sheet is high in order to enhance the matte tone of the obtained transfer layer. Then, the strength of the base sheet is lowered, and the base sheet may be cut by heat and tension in the transfer processing step by the transfer sheet. Therefore, the content ratio of the matting agent in the resin film forming the base sheet cannot be increased, and the matte degree of the obtained transfer layer is limited by itself.

Further, in the case of using a substrate sheet composed of a resin film having a cured coating layer of a thermosetting matte ink on the surface of the item (2), the coating unevenness of the cured coating layer by the matte ink or Depending on the curing conditions of the coating layer, the matteness may not be uniform, and the matteness of the resulting transfer layer may become uneven, or the cured coating layer on the surface of the base sheet in the transfer layer transfer step. Has a drawback that it peels off and stains the transfer layer surface.

Further, in the case of using the base sheet made of a resin film whose surface is subjected to sandblasting in the item (3), the mat effect is low and a beautiful mat-like transfer layer cannot be formed.

On the other hand, according to the present invention, a beautiful transfer layer having a high matting effect can be formed on a transfer target, and the base sheet is not cut by heat and tension in the transfer processing step. Provide a transfer sheet.

[0008]

The invention according to claim 1 has a base sheet having a release surface on the surface, and a transfer layer formed on the release surface of the base sheet. The base sheet is a multi-layer sheet formed by co-extrusion of molten resin, and at least the resin layer of the base sheet that is in contact with the transfer layer is a mat layer having a matte tone. It consists of a transfer sheet.

According to a second aspect of the present invention, in the constitution of the transfer sheet according to the first aspect of the present invention, a base sheet made of a multilayer sheet formed by coextrusion of a molten resin is in contact with at least the transfer layer of the base sheet. The resin layer on the corresponding side is a mat layer containing a matting agent.

According to a third aspect of the present invention, in the constitution of the transfer sheet according to the first or second aspect of the present invention, a base sheet made of a multilayer sheet formed by coextrusion of a molten resin is provided on the side contacting the transfer layer. The resin layer is a matte layer containing a matting agent and a non-matt resin layer containing no matting agent.

The base sheet in the transfer sheet of the present invention having the above-mentioned structure is the same as the base sheet used in the conventional transfer sheet of this type, and
Thermoplastic resin capable of co-extrusion of molten resin, for example, polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymer, polyophine resin such as polyethylene, polypropylene and polymethylpentene, Poly (vinyl fluoride), poly (vinylidene fluoride), poly (tetrafluoroethylene), poly (fluorinated ethylene) resin such as ethylene / tetrafluoroethylene copolymer, polyamide resin such as nylon-6, narilone-6,6, poly Vinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, polyvinyl alcohol and other vinyl resins, cellulose triacetate, cellophane and other cellulose resins, polymethylmethacrylate, polyethylmethacrylate, polya Acrylic resin according butyl acrylic acid, etc., polystyrene, polycarbonate, polyarylate resin made of the polyimide or the like is utilized, 2 of sufficient intensity to bond strength is required to the substrate sheet of the transfer sheet
About 10 to 200 µ, preferably 19 to 3 layers or 3 layers
A multi-layer sheet of about 50 μ is used. The multi-layer sheet formed by co-extrusion molding of the molten resin may be a combination of different types of resins as long as it has sufficient strength required for the base sheet in the transfer sheet, as described above. Although it may be present, a multilayer sheet obtained by coextrusion molding of the same type of resin is preferable because the interlayer strength thereof becomes good.

In a base sheet made of a multilayer sheet formed by coextrusion of a molten resin, at least the resin layer on the side in contact with the transfer layer of the base sheet is a mat layer having a matte tone. , Matte the surface of the multi-layer sheet by co-extrusion, or grain size 1.0 ~
The resin layer is formed by forming a matting agent of about 10 μm, for example, a matting layer containing a matting agent such as barium sulfate, calcium carbonate, silicon oxide, and particularly porous silica called siloid. The amount of matting agent added is determined according to the desired degree of matting. For example, particle size 3-7μ
JIS-Z-8741 using porous m of about m
2 to 6 when it is about 20 degree in 60 degree method glossiness
The amount added is about wt%.

The matte layer, which is the resin layer on the side in contact with the transfer layer, has a matte degree of the surface of the transfer layer transferred to the surface of the substrate of 80 in terms of 60-degree gloss of JIS-Z-8741.
A matte appearance is tentatively obtained by matting so that the glossiness is not more than 40 degrees, but it is preferably 20 degrees or less in order to obtain a particularly good matte appearance.

Compared with the resin layer on the side of the base sheet which is in contact with the transfer layer, the resin layer formed of the non-matte layer has flexibility,
Increased thermoplasticity and breaking strength. For example, if the physical properties of the resin itself forming both the resin layer on the side in contact with the transfer layer and the other resin layer are the same, the resin layer containing the matting agent is a non-matte resin layer. Compared to layers,
Inevitably, flexibility, thermoplasticity, and breaking strength are lowered, and the above conditions are satisfied. For example, when the resin layer forming the base sheet is made of polyethylene terephthalate (PET) to which the above-mentioned matting agent is added, when the amount of the matting agent added is 2% by weight or more, the strength of the resin layer increases rapidly. It becomes impossible to maintain the strength required for thermal transfer. Therefore, it is indispensable to laminate a resin layer made of a non-matt layer on the resin layer to which the matting agent is added.

The resin layer on the side in contact with the transfer layer is mixed with, for example, various waxes or silicones in order to enhance the releasability of the release surface of the substrate sheet.

A release layer, which is a surface layer of a transfer layer transferred to a substrate (transfer target), is formed on the release surface of the substrate sheet, if necessary. That is, the release layer serves as a surface layer of the transfer layer that remains on the substrate (transfer target) side when the base material sheet is released from the transfer sheet after the transfer layer transfer step using the transfer sheet. It acts to facilitate peeling between the base sheet and the transfer layer. This release layer is made of, for example, an acrylic resin such as polymethacrylate or polybutylmethacrylate, a polyurethane resin, a vinyl chloride / vinyl acetate copolymer resin, an ultraviolet or electron beam curable acrylate resin, an epoxy resin or an unsaturated polyester resin, Further, it is usually 1.0 to 4.0 μm, preferably 1.5 to 3.
It is formed with a thickness of about 0 μm.

The decorative layer is to add design characteristics to the transferred object by transferring the transfer layer, and is formed of, for example, a pattern layer or a metal thin film layer. The decorative layer may be a single layer or a combination of two or more layers. As an example of the combination of two or more layers, a pattern layer showing a pattern and a metal showing a metallic luster. It can be a decorative layer including a thin film layer. In the case of a decorative layer consisting of a picture layer showing a picture pattern and a metal thin film layer showing a metallic luster, a metal thin film layer is provided between the picture layer and an adhesive layer described later, or a release layer. And a pattern layer, it becomes a transfer sheet capable of imparting higher design characteristics.

The pattern layer is formed as a printed layer of ink containing resin as a vehicle. Examples of the resin forming the vehicle include acrylic acid ester resins such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate, methacrylic acid resins, copolymer resins of these, polystyrene, and poly -Α
-Styrene resin such as methylstyrene and styrene copolymer resin, cellulose acetate resin, vinyl chloride resin,
One or a mixture of two or more resins such as polyester resin is used.

An adhesive layer is formed on the decorative layer of the transfer sheet, if necessary. This adhesive layer is formed of, for example, an acrylic resin, an acrylic / styrene copolymer resin, a vinyl chloride / vinyl acetate copolymer resin, polyvinyl butyral, polyurethane, chlorinated rubber, cyclized rubber, or the like. Then, the transfer system of the transfer sheet is determined by the type of the adhesive layer. That is, in the case of a transfer sheet having an adhesive layer made of a thermoplastic resin, a thermal transfer method in which the adhesive layer is heated and melted to develop an adhesive force, and in the case of a transfer sheet having an adhesive layer made of a solvent-soluble resin Is a solvent-activated transfer method in which a part of the adhesive layer is dissolved by a solvent to develop an adhesive force, and in the case of a transfer sheet having an adhesive layer using a pressure-sensitive adhesive, the adhesive layer is adhered by pressing. Adhesive transfer method for expressing force is used.

It is not necessary to provide the adhesive layer on the transfer sheet when the adhesive layer is previously formed on the surface of the substrate which is the transfer target.

Each resin layer in the transfer sheet is formed by a coating means such as gravure coating or roll coating, or a printing means such as gravure printing or screen printing.

In the transfer of the transfer layer by the transfer sheet having the above-mentioned structure, the surface of the base body which is the transfer target and the opposite surface of the base sheet of the transfer sheet are brought into contact with each other, and the transfer target (base material) is transferred. ), The transfer sheet is placed on the surface of the substrate, the substrate is heated and pressed from the side of the substrate, and the substrate is peeled off. A heating roller method, Japanese Patent Publication No. 2-4080, JP-A-57-129731, etc. The transfer layer is transferred simultaneously with the injection molding of the substrate described in
Injection molding simultaneous transfer method for peeling a substrate sheet, JP-A-57 / 1982
The transfer layer is transferred in the vacuum pressing process described in Japanese Patent Laid-Open No. 51458/1982 and Japanese Utility Model Laid-Open No. 1-80500, and is further performed by a vacuum press transfer method for peeling the base material sheet. In particular, the formation of the transfer layer by the transfer sheet of the present invention is effective in the case of a transfer method in which heat and tension are applied to the transfer sheet in the transfer step.

[0023]

The transfer sheet of the present invention is a transfer sheet having a base sheet having a release surface and a transfer layer formed on the release surface of the base sheet. Is a multi-layer sheet formed by coextrusion of a molten resin, and at least the resin layer on the side of the base sheet that contacts the transfer layer is a mat layer having a matte tone. The resin layer on the abutting side fulfills the releasing performance and the matte imparting performance for the transfer layer, and the non-matte resin layer fulfills the function of maintaining the mechanical strength capable of withstanding deformation by heat and stress.

The base material sheet of the transfer sheet is adapted for flexible plastic deformation of the non-matte resin layer even if the matte layer of the base material sheet becomes fragile due to, for example, mixing of a matting agent. Therefore, the stress applied to the transfer sheet is uniformly dispersed.

Further, the resin layer itself, which constitutes the non-matt layer in the base sheet, has a resistance to local cracking and cutting due to the presence of the matte layer formed by coextrusion of the molten resin, and is deformed to heat and stress. The durability that can withstand is achieved synergistically.

Further, since the multilayer structure of the base sheet is formed by coextrusion of molten resin, the resin layer has a high adhesive strength between resin layers and a resin having a thermosetting matte ink cured coating layer on the conventional surface. There is no risk of peeling between layers due to heat or stress in the transfer step, unlike a base sheet made of a film.

According to the above, according to the transfer sheet of the present invention, it is possible to make the transfer layer exhibit sufficient matting as desired, and the release of the transfer layer in the transfer step is good. In addition, even when heat and stress are applied to the transfer sheet more than necessary in the transfer process, the transfer sheet does not cut and good transfer can be smoothly performed. To do.

[0028]

EXAMPLES The specific structure of the transfer sheet of the present invention will be described below based on examples.

In "Example 1" [FIG. 1], polyethylene terephthalate (PET) containing 3 to 4% by weight of a matting agent made of porous silica called siloid having an average particle size of 3 to 6 μm was formed by coextrusion of a molten resin. ) After obtaining a multilayer sheet 4 having a thickness of 26 μm consisting of the resin layer 2 and the polyethylene terephthalate (PET) resin layer 3 containing no additive, the multilayer sheet 4 is provided on the surface of the polyethylene terephthalate resin layer 2 containing the matting agent. , A peeling ink "TR16 varnish" manufactured by Dainippon Ink and Chemicals, Inc., whose main component is an acrylic resin [Tg: 105 ° C], is solid-printed by a gravure printing method to form a peeling layer 5 having a thickness of 2.5 µm. Was formed.

Next, on the peeling layer 5, a colored ink using an acrylic resin as a vehicle "Showa Ink Industry Co., Ltd .: G"
"G black" was solid-printed by a gravure printing method to form a decoration layer 6 having a thickness of 5.0 μm.

Thereafter, an acrylic resin-based ink "Showa Ink Mfg. Co., Ltd .: HS32 Matt" is solidly coated on the decorative layer 6 by a gravure printing method to form an adhesive layer 7 having a thickness of 4.0 μm. A transfer sheet 1 having the multilayer sheet 4 as a base material sheet was obtained.

In the transfer sheet 1, the release layer 5
The decorative layer 6 and the adhesive layer 7 are the transfer layer 8.

[Experiment 1] The surface of the ABS resin molding was brought into contact with the surface of the adhesive layer 7 of the transfer sheet 1, and the transfer layer 8 of the transfer sheet 1 was transferred by heat and pressure. A matt black transfer layer was obtained, and a high degree of design characteristics was imparted to the ABS resin molded body.

[Example 2] A polyethylene terephthalate (PET) resin layer containing 2-3 wt% of a matting agent made of porous silica called siloid having an average particle diameter of 5 to 7 µm was added by coextrusion of a molten resin, and added. After obtaining a multilayer sheet having a thickness of 26 μm with a polyethylene terephthalate (PET) resin layer containing no substance, on the polyethylene terephthalate resin layer surface containing the matting agent of the multilayer sheet, 100 parts by weight of a vehicle based on a urethane resin is used. An ink obtained by adding 4 parts by weight of an isocyanate curing agent "Special Coloring Material: UA-63" to an ink "Special Coloring Material: EU-553F" mixed with 14 parts by weight of collagen fiber. Was solid-printed by a gravure printing method to form a first decorative layer having a thickness of 5.0 μm.

Thereafter, an ink of acrylic resin "Showa Ink Industry Co., Ltd. G" was formed on the first decorative layer.
"3 parts by weight of GG black was added to 100 parts by weight of G white concrete for color matching" was applied by solid printing by a gravure printing method to form a second decorative layer consisting of a pattern printing layer having a thickness of 4.0 μm. Formed.

Subsequently, an acrylic resin-based ink "Showa Ink Mfg. Co., Ltd .: HS32 Gray" was solidly coated on the second decorative layer by a gravure printing method to form an adhesive layer having a thickness of 4.0 .mu.m. Was formed to obtain a transfer sheet using the multilayer sheet as a base material sheet.

In this transfer sheet, the first decorative layer, the second decorative layer and the adhesive layer are transfer layers.

[Experiment 2] The adhesive layer surface of the above-mentioned transfer sheet was brought into contact with the surface of the polystyrene resin molded body, and the transfer layer of the transfer sheet was transferred by heat and pressure. As a result, it became moist like natural leather. A transfer layer having a unique design by appearance and feel was obtained.

Example 3 A polyethylene terephthalate (PET) resin layer containing a matting agent made of porous silica called siloid having an average particle size of 4 to 6 μm by coextrusion of a molten resin, and polyethylene containing no additive. Thickness with terephthalate (PET) resin layer 26
After obtaining a multi-layer sheet having a thickness of μm, a release ink containing an acrylic resin as a main component "TR16cw Varnish No. 4" on the surface of the polyethylene terephthalate resin layer containing the matting agent of the multi-layer sheet. Was applied by solid printing by a gravure printing method to form a release layer having a thickness of 2.5 μm.

Next, on the release layer, a colored ink "GG Silver 500 of Showa Ink Mfg. Co., Ltd., which is a vehicle made of an acrylic resin to which a bright pigment (trademark; Elgi) by a colored aluminum foil piece is added is used. The mixed ink of 1 part by weight and 5 parts by weight of GG medium ”was solid-printed by a gravure printing method to form a first decorative layer having a thickness of 3.0 μm.

Thereafter, a colored ink "Showa Ink Mfg. Co., Ltd .: GG black", which uses an acrylic resin as a vehicle, is solidly printed on the first decorative layer by a gravure printing method to give a thickness of 5.0 .mu.m. A second decorative layer was formed.

Subsequently, an acrylic resin-based ink "Showa Ink Mfg. Co., Ltd .: HS32 Matt" was applied by solid printing by a gravure printing method to form an adhesive layer having a thickness of 4.0 μm, and the multilayer sheet was used as a base sheet. A transfer sheet was obtained.

In this transfer sheet, the release layer, the first decorative layer, the second decorative layer and the adhesive layer are transfer layers.

[Experiment 3] The surface of the ABS resin molding was brought into contact with the adhesive layer surface of the transfer sheet, and the transfer layer of the transfer sheet was transferred by heat and pressure. The glittering pigment (trademark; ELJI) exhibits the brilliant glittering property, but the matting effect is sufficient, so that a transfer layer having a soft feeling and a calm atmosphere is formed as a whole, and the ABS resin molding is highly advanced. The design characteristics of

[0045]

[Effect] According to the transfer sheet of the present invention, even if the resin layer in contact with the transfer layer of the base sheet in the transfer sheet is highly matted, the mechanical strength of the resin layer composed of the non-matt layer is improved. Because of the compensation, there is no fear that the base sheet is cut by heat and tension in the transfer processing step, and a beautiful transfer layer having a high mat effect can be formed on the transfer target.

[Brief description of drawings]

FIG. 1 is a model cross-sectional view of a transfer sheet according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transfer sheet consisting of base material sheet 4 and transfer layer 8 ... Resin layer consisting of matte layer in base material sheet 3 ... Resin layer consisting of non-matte layer in base material sheet 4 .... Base material sheet consisting of multi-layer sheet formed by co-extrusion of molten resin 5 ... Release layer 6 ... Decoration layer 7 ... Adhesive layer 8 ... Transfer layer

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 27/20 Z 6122-4F B44C 1/165 F 9134-3K // B29L 9:00 4F

Claims (3)

[Claims] 1. A transfer sheet having a base sheet whose surface is a release surface and a transfer layer which is formed on the release surface of the base sheet, wherein the base sheet is made of a molten resin. It consists of a multi-layer sheet made by extrusion molding, and
A transfer sheet, wherein at least a resin layer of the base sheet, which is in contact with the transfer layer, is a mat layer having a matte tone. 2. A base material sheet comprising a multilayered sheet formed by coextrusion of a molten resin, and at least a resin layer of the base material sheet on the side in contact with the transfer layer comprises a matte layer containing a matting agent. The transfer sheet according to claim 1, wherein: 3. A base material sheet comprising a multi-layer sheet formed by coextrusion molding of a molten resin, comprising a resin layer made of a mat layer containing a matting agent and a non-matte layer containing no matting agent on the side in contact with the transfer layer. The transfer sheet according to claim 1 or 2, comprising a resin layer.