JPS6387285A - Thermal transfer recording sheet with adhesive layer - Google Patents

Abstract

PURPOSE:To enable the title sheet to be easily adhered to other object after image formation, by providing a receiving layer for a dye transferred from a transfer sheet on the upper side of a sheet-shaped base, and providing an adhesive layer on the lower side of the base. CONSTITUTION:A receiving layer 3 is provided on the upper side of a sheet- shaped base 2, an adhesive layer 4 is provided on the lower side, and an intermediate layer 5 is provided between the upper side of the base 2 and the image- receiving layer 3, whereby heat-insulating properties and cushioning properties of the surface at the time of image formation can be enhanced. The adhesive layer 4 is provided for adhering a thermal transfer recording sheet 1 onto other object after the image formation, and an adhesive based on a polyacrylic acid ester or on a rubber is used. In consideration of the possibility of adhesion of the sheets 1 to each other by the adhesive at the time of stacking the sheets 1 or taking up the sheets 1, a releasing agent layer may be provided on the surface of the receiving layer 3, or a releasable sheet 6 such as a releasable film, e.g., a polyethylene film and a silicone-treated releasable paper may be adhered to the adhesive layer, thereby preventing the adhesion of the sheets 1 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal transfer sheet that is used in combination with a thermal transfer sheet and that can be easily attached to various articles after transfer.

(Prior art) A thermal transfer sheet having a dye layer containing a sublimable disperse dye is heated in spots according to an image signal using a thermal head, etc., and an image made of the dye transferred to the surface of resin-coated paper is created. Attempts are being made to form a

However, with conventional thermal transfer sheets, it is sufficient to be able to record on the sheet for forming images or for facsimile purposes, but it is inconvenient to paste it onto other items after the image is formed. Ta.

(Problems to be Solved by the Invention) Therefore, it is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to make it easier to attach an image to other articles after it is formed.

(Means for Solving the Problems) In the present invention, r is used in combination with a thermal transfer sheet having a dye layer containing a dye that melts or sublimates and transfers by heat, and on one side of a sheet-like base material, "Thermal transfer sheet has a receptor layer that receives the dye transferred from the transfer sheet, containing substantially only a synthetic resin, and has an adhesive layer on the other side of the sheet-like base material." By adopting this configuration, the drawbacks of the above-mentioned conventional techniques can be overcome.

The thermal transfer sheet 1 of the present invention has, for example, a receptor layer 3 on the upper surface of a sheet-like base material 2 and an adhesive layer 4 on the lower surface, as shown in FIG.

Alternatively, as shown in FIG. 2, the thermal transfer sheet 1 has an intermediate layer 5 between the sheet-like base material 2 and the receptor layer 3, and by providing the intermediate layer, heat insulation of the surface during image formation is achieved. It can improve your sex and physicality.

FIG. 3 shows a state in which a release sheet 6 is attached to the adhesive layer of the thermal transfer sheet shown in FIG. Although not shown in Figure 0, which can prevent the sheets from adhering to each other and becoming unusable, a releasable sheet can be similarly attached to the thermal transfer sheet shown in Figure 2.

In FIG. 4, a thermal transfer sheet with a release sheet as shown in FIG. When the release sheet is peeled off, a label-shaped thermal transfer sheet with a predetermined shape and size is obtained.In addition, as described above, a large number of areas with a predetermined shape are formed, and the sheets are peeled off one by one. However, it is also possible to form a large number of areas of a predetermined shape with spaces between them, or to form one label at a time. In any of the above cases, Necessary printing such as columns, frames, characters, etc. may be applied in advance so that they can be seen from the receiving layer side.

(Sheet-like base material) As the sheet-like base material 2, ■synthetic paper (polyolefin type, polystyrene type, etc.), ■high-quality paper, art paper, coated paper, cast-coated paper, wallpaper-backed paper, synthetic resin or emulsion-impregnated paper. , synthetic rubber latex-impregnated paper, synthetic resin-loaded paper, paperboard, or natural fiber paper such as cellulose fiber paper; ■ Various plasti, resin films such as polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, methacrylate, polycarbonate, etc. Seats are available. Among these, synthetic paper (2) is preferable because it has a microvoid layer with low thermal conductivity (in other words, high heat insulation) on its surface;
A laminate made of any combination of ~■ can also be used. Examples of typical laminates include cellulose fiber paper and synthetic paper.
Alternatively, a laminate of cellulose fiber paper and a plastic film or sheet may be used. Among these, the laminate of cellulose fiber paper and synthetic paper has a structure in which the cellulose fiber paper does not compensate for the thermal instability (expansion and contraction, etc.) of the synthetic paper.
The low thermal conductivity of synthetic paper makes it possible to take advantage of the high thermal sensitivity of printing, and in order to balance the front and back sides of the laminate in this combination, synthetic paper - cellulose fiber -
It is better to use a three-layer laminate of synthetic material (it can reduce curling caused by printing).

As the synthetic paper used for the above-mentioned laminate, generally any material can be used as long as it can be used as a base material for the thermal transfer sheet, but in particular, synthetic paper with a zigzag layer having fine pores is used. (For example, commercially available synthetic paper: Yupo: manufactured by Oji Yuka Synthetic Paper) is preferable.The fine pores in the above-mentioned layer can be formed by, for example, stretching a synthetic resin in a state containing a fine filler. Can be done. A thermal transfer sheet constructed using a synthetic paper provided with a zigzag layer containing micropores has the effect that when an image is formed by thermal transfer, the image density is high and there is no variation in the image.

It is thought that the fine pores have a heat insulating effect, the thermal energy efficiency is good, and the fine pores have good cushioning properties, which contribute to the receiving layer provided on the synthetic paper and on which images are formed. It will be done. It is also possible to provide the paper-like layer containing the above-mentioned micropores directly on the surface of a core material such as cellulose fiber paper.

A plastic film can be used in addition to the cellulose fiber paper in the laminate, and a laminate of the cellulose fiber paper and a plastic film can also be used.

Examples of methods for bonding synthetic paper and cellulose fiber paper include bonding using a conventionally known adhesive, bonding using an extrusion lamination method, and bonding using thermal adhesive. The method for attaching the plastic film to the plastic film is the lamination method, which also serves as a plastic film formation at the same time.
Examples include pasting by a calendar method or the like. The above-mentioned pasting means is appropriately selected depending on the material of the synthetic paper and the material to be pasted. Specific examples of the adhesive include emulsion adhesives such as ethylene-vinyl acetate copolymer and polyvinyl acetate;
Examples include water-soluble adhesives such as polyester containing carboxyl groups, and examples of adhesives for lamination include organic solvent solutions such as polyurethane and acrylic. Adhesives include:

(Receiving layer) The material constituting the receptor N3 is a layer for receiving (receiving) an image of a dye transferred from a thermal transfer sheet, such as a sublimable disperse dye, and maintaining the image formed by reception. The following synthetic resins (al to +e) can be used alone or in combination of two or more.

Those with a lal ester bond.

Polyester resin, polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, vinyltoluene acrylate resin.

(Those with bl urethane bonds.

Polyurethane resin, etc.

tc>Those having an amide bond.

Polyamide resin (nylon).

(Those with dl urea bond.

Urea resin etc.

tel and other substances with highly polar bonds.

Polycaprolactone resin, polystyrene resin, polyvinyl chloride resin, polyacrylonitrile resin, etc.

Alternatively, the receptor layer 3 is made of a mixed resin of saturated polyester and vinyl chloride/vinyl acetate copolymer. Examples of saturated polyesters include Byron 200, Byron 290, Byron 600 (manufactured by Toyobo Co., Ltd.), KA-
1038C (manufactured by Arayo Kagaku), TP220, TP235 (
As mentioned above, Japanese synthetic type) etc. are used.

The vinyl chloride/vinyl acetate copolymer resin preferably has a vinyl chloride component content of 85 to 97 iu1% and a degree of polymerization of about 200 to 800. The copolymer is not limited to a copolymer containing only a polymer component, but may also contain a vinyl alcohol component, a maleic acid component, and the like.

The receptor layer 3 may also be composed of a polystyrene-based resin, for example, a styrene-based monomer, such as
Polystyrene resins consisting of styrene, α-methylstyrene, vinyltoluene alone or copolymers, or acrylic resins such as styrene monomers and other monomers, such as acrylic esters, methacrylic esters, acrylonitrile, methacrylonitrile, etc. Alternatively, a styrene copolymer resin which is a copolymer with a methacrylic monomer or maleic anhydride may be used.

In any of the above embodiments, it is desirable that the receiving layer 3 consists essentially of synthetic resin.

This is because if a filler is added to a synthetic resin with the intention of improving whiteness, coating suitability, etc., the surface gloss of the receiving layer will be insufficient, and as in the present invention, after image formation, other articles cannot be coated. This is because when pasting, it is desirable that the pasted sheet has high gloss.

In the receiving layer, in order to further increase the light resistance of the transferred image,
One or more additives such as ultraviolet absorbers, light stabilizers, or antioxidants may be added as necessary. The amounts of these ultraviolet absorbers and light stabilizers added are preferably approximately 0.05 to 10 parts by weight and 0.5 to 3 parts by weight, respectively, relative to 100 parts by weight of the resin constituting the receptor layer 3.

(Adhesive layer) The adhesive layer 4 in the present invention is for attaching the thermal transfer sheet after image formation to other articles.

As the adhesive, a polyacrylic ester type adhesive or a rubber type adhesive can be used.

When stacking or winding up thermal transfer sheets, there is a risk that they may adhere to each other due to the adhesive layer, so a release agent layer is provided on the outermost surface of the thermal transfer sheet on the receiving layer side (and
Such undesirable adhesion can be prevented. Alternatively, undesirable adhesion can be similarly prevented by attaching a release film such as a polyethylene film or a release sheet such as silicone-treated release paper to the adhesive layer.

In the thermal transfer sheet of the present invention, in order to improve the releasability from the thermal transfer sheet, the 0M type agent that can contain a mold release agent in the receptor layer is polyethylene wax,
Examples include solid waxes such as amide wax and Teflon powder; fluorine-based and phosphoric acid ester-based surfactants; and silicone oil, with silicone oil being preferred.

As the above-mentioned silicone oil, an oily one can be used, but a curable type is preferable. Examples of the curable silicone oil include a reaction-curing type, a photo-curing type, a catalytic-curing type, and a reaction-curing type. As the zero-reaction curing silicone oil, the silicone oil is particularly preferable.
Preferably, an amino-modified silicone oil and an epoxy-modified silicone oil are reacted and cured, and examples of the amino-modified silicone oil include KF-393 and KF-85.
7, KF-858, X-22-3680, X-22-3
80IC (manufactured by Shin-Etsu Chemical Co., Ltd.), etc., and examples of epoxy modified silicone oil include KF-100T,
Examples include KF-101, KF-60-164, and KF-103 (manufactured by Shin-Etsu Chemical Co., Ltd.). MS-7 is also a catalyst-curing or photo-curing silicone oil.
05F, KS-770 (catalytic curing silicone oil: manufactured by Shin-Etsu Chemical Co., Ltd.), KS-720, KS-77
4 (Photo-curing silicone oil: Shin-Etsu Chemical Co., Ltd.
), etc. The amount of these curable silicone oils added is preferably 0.5 to 30% by weight of the resin constituting the image receiving layer. Acceptance F again! The mold release agent can also be provided by dissolving or dispersing the above mold release agent in a suitable solvent and coating it on a part of the surface of the film 3, followed by drying. As the mold release agent constituting the mold release agent, a reaction cured product of the above-mentioned amino-modified silicone oil and epoxy-modified silicone oil is particularly preferred.

The thickness of the release agent layer is 0.01 to 5 μm, especially 0.05 to 2
μm is preferred.

Note that if silicone oil is added when forming the receiving layer, the release agent layer can be formed even if the silicone oil bleeds onto the surface after coating and is then cured.

The above-mentioned white pigment, ultraviolet absorber, light stabilizer, antioxidant, and mold release agent can be applied so as to be included in the receiving layer on one side or both sides, if necessary.

The receptive layer N3 is formed by using a receptive layer forming composition obtained by dissolving or dispersing the material for forming the receptive layer on the sheet-like base material 2, and by a known coating or printing method. It may also be carried out by a method in which it is first formed on a temporary carrier different from the sheet-like base material 2 and then transferred onto the sheet-like base material 2 again.

As a temporary carrier, use a sheet with a releasable surface.For example, ■Cellulose fiber paper or synthetic paper with an undercoat layer applied to the surface and then a release silicone layer applied, ■Cellulose fiber paper (1) The surface of the film is extrusion coated with polyolefin resin or polyester resin, or (2) the surface of a plastic film such as a polyester film is coated with a releasing silicone layer.

- After forming the receptive layer on the temporary carrier in the same manner as on the sheet-like substrate 2, if necessary, an adhesive layer is formed. This adhesive layer is for ensuring adhesive force between the sheet-like base material 2 and the receiving layer 3 when transferring the image-receiving layer onto the sheet-like base material 2. In this method, another layer, for example, an intermediate layer imparting adhesive properties, is formed on the temporary carrier, and the intermediate layer and the receiving layer are transferred onto the sheet-like base material 2 at the same time. If the intermediate layer also serves as an adhesive, the adhesive layer may not be formed on the temporary carrier. In either case, the adhesive layer is bonded to the sheet-like substrate and - Since the adhesive layer only needs to be interposed between the uppermost layer on the temporary carrier, an adhesive layer is formed on the sheet-like base material 2, and only the receiving layer or the receiving layer and the intermediate layer are placed on the temporary carrier. may be formed in sequence and then transferred.

When a method is adopted in which the receptive layer 3 is once formed on a temporary carrier and then formed on the sheet-like base material 2 by a transfer method, the surface of the receptive layer formed on the sheet-like base material 2 is - Because the surface condition of the temporary carrier is transferred, it has very good smoothness, and the receiving layer formed directly on the sheet-like base material 2 has inferior smoothness compared to the receiving layer formed by the transfer method. If you want to get a clearer and clearer image,
It is better to use the transcription method.

The adhesive may be any adhesive that can bond the receptor layer and the base material, such as polyester, polyacrylic ester,
Organic solvent solutions or emulsions of polyurethane, polyvinyl chloride, polyolefin, ethylene-vinyl acetate copolymers, synthetic rubber, etc. can be used. The adhesive may be either a thermal adhesive type or a room temperature adhesive type. In the case of a thermal adhesive type, thermal adhesives such as wax, ethylene/vinyl acetate copolymer resin, polyolefin, petroleum resin, etc., may be used. Alternatively, sandwich lamination using an extrusion film such as a polyolefin film may be used.

Double-sided tape may be used as an adhesive that also serves as an intermediate layer.Double-sided tape is made by impregnating rayon paper with an acrylic adhesive and drying it.After drying, the double-sided tape has micropores that form a foam layer. It seems that they play an equivalent role.

(Intermediate Layer) The intermediate layer 4 is either a cushioning layer or a porous layer depending on the material it is made of, or may also serve as an adhesive in some cases.

The cushioning layer is 1 defined in JIS-6301.
00% modulus is 100Kg/cd or less, and if the 100% modulus exceeds 100Kg/cd, the rigidity is too high, so such a resin is used to form the intermediate layer. However, sufficient adhesion between the thermal transfer sheet and the thermal transfer layer during printing cannot be maintained.
Also, the lower limit of the 100% modulus is actually 0.5K
It is about g/aJ.

Examples of resins that meet the above conditions include the following.

Polyurethane resin Polyester resin Polybutadiene resin Polyacrylate ester resin Epoxy resin Polyamide resin Rosin modified phenol resin Terpene phenol resin Ethylene/vinyl acetate copolymer resin The above resins can be used singly or in combination of two or more. The above resins are relatively sticky, so if there is a problem during processing, inorganic additives,
For example, silica, alumina, clay, calcium carbonate, etc., or amide-based substances such as stearamide may be added.

The cushioning layer can be formed by kneading the resin as described above with a solvent, diluent, etc. along with other additives as necessary to form a paint or ink, and drying it as a coating film using a known coating method or printing method. , its thickness is 0
．． It is about 5 to 50 μm, more preferably about 2 to 20 μm.

If the thickness is 0.5 μm, it will not be able to absorb the roughness of the surface of the sheet-like base material provided, and therefore it will not be effective (on the contrary, if it exceeds 50 μm, not only will there be no improvement in the effect, but the receiving layer will be too thick. It protrudes too much and becomes a hindrance when winding or overlapping, and is not economical.

Formation of such an intermediate layer improves the adhesion between the thermal transfer sheet and the sheet to be thermally transferred, probably because the intermediate layer itself has low rigidity and is deformed by pressure during printing. Resins like these usually have low glass transition points and low softening points (it is assumed that the thermal energy applied during printing makes them even more rigid and deformable than at room temperature, contributing to this). Ru.

The porous layer is made of ■synthetic resin emulsion such as polyurethane,
A layer obtained by applying a liquid made by mechanically stirring a synthetic rubber latex such as methyl methacrylate-butadiene and drying it onto the base material 2, (2) the above synthetic resin emulsion, and a liquid obtained by mixing a foaming agent into the above synthetic rubber latex. A layer obtained by coating the base material 2 with a foaming agent and heating it. A layer foamed with a solution of a thermoplastic resin or synthetic rubber dissolved in an organic solvent, and a layer that is less likely to evaporate than the organic solvent and is compatible with the organic solvent and is compatible with the thermoplastic resin or synthetic rubber. A microporous layer formed by coating a mixed solution with a non-solvent that does not have solubility (including those mainly composed of water) on the base material 2 and drying it to form a microscopically aggregated film. etc. are used. Above ■～
Because the size of bubbles in the layer (①) is large, a receptor layer 3 is placed on top of the layer (①).
When the forming solution is applied and dried, there is a risk that the surface of the dry receiving layer 3 will be uneven. Therefore, in order to obtain a surface of the receptor layer 3 with small irregularities and on which a highly uniform image can be transferred, it is preferable to provide the microporous layer (2) above as the porous layer.

The thermoplastic resin used for forming the above microporous layer includes saturated polyester, polyurethane,
Vinyl chloride/vinyl acetate copolymers, cellulose acetate propionate, etc. may be mentioned, and the synthetic rubbers that can be used similarly include styrene-butadiene, isoprene, urethane, and the like. Various organic solvents and nonsolvents can be used to form the microporous layer, but hydrophilic solvents such as methyl ethyl ketone and alcohol are usually used as the organic solvent, and water is also used as the nonsolvent. used.

The thickness of the porous layer in the present invention is preferably 3 μm or more, particularly preferably 5 to 20 μm. If the thickness of the porous layer is less than 3 μm, the cushioning and heat insulation effects will not be exhibited.

Although the explanation has been complicated, as mentioned in the explanation of the method for forming the receptor layer, the intermediate layer may also serve as an adhesive in some cases.

In order to suppress the generation of static electricity during the processing of the thermal transfer sheet or when it runs in a printer, an antistatic agent may be contained in the receptor layer on at least one side or on the surface of the receptor layer. Antistatic agents include surfactants such as cationic surfactants (for example, quaternary ammonium salts, polyamine derivatives, etc.), anionic surfactants (for example, alkyl phosphates, etc.), amphoteric surfactants or nonionic surfactants. type surfactants.

The antistatic agent may be applied to the surface of the receptor layer by gravure coating, bar coating, etc. (or may be kneaded into the resin of the receptor layer and transferred to the surface of the receptor layer during coating and drying of the receptor layer).

A cationic acrylic polymer can also be used as an antistatic agent to be mixed with the receptor layer resin.

(Actions and Effects of the Invention) Since the thermal transfer sheet of the present invention has an adhesive layer on the back surface, it can be easily attached to other articles after image formation.

(Example of Application of the Invention) The thermal transfer sheet of the present invention can be used for: ■Formation of facial photographs on simple ID cards, ■Formation of facial photographs on business cards, ■Painting on telephone cards, ■Premium ■Postcards, ■Window advertisements , ■Illuminated signboards, ■Various decorations, ■Logging tags, @Product explanation labels, 0
It can be applied to stationery labels, indexes for audio cassettes and video cassettes, etc.

[Brief explanation of the drawing]

1 to 4 are cross-sectional views of the thermal transfer sheet of the present invention. (Explanation of symbols)

Claims (3)

[Claims] (1) The transfer sheet is used in combination with a thermal transfer sheet having a dye layer containing a dye that melts or sublimates and transfers when heated, and contains substantially only a synthetic resin on one side of the sheet-like base material. A thermal transfer sheet that has a receptor layer that receives dyes that migrate more easily and has an adhesive layer on the other side of a sheet-like base material. (2) The thermal transfer sheet according to claim 1, wherein a releasable sheet is attached to the surface of the adhesive layer. (3) The thermal transfer sheet according to claim 1 or 2, which has an intermediate layer between the sheet-like base material and the receptor layer.