JPH08300835A - Dye receiving sheet for thermal transfer - Google Patents

Abstract

(57) [Summary] [Object] To provide a thermal transfer receiving sheet that does not curl during printing, has a high transfer density, and has good light resistance of an image. A thermal transfer receiving sheet comprising an image receiving layer formed on at least one surface of a sheet-shaped substrate, wherein the image receiving layer contains an ultraviolet absorber and an adipic acid ester compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer receiving sheet for a printer which transfers a sublimable disperse dye by heat to form a dyed image. More specifically, the present invention relates to a dye receiving sheet for thermal transfer, which is useful in a thermal printer, particularly a dye thermal transfer printer, and useful for printing a full-color image having excellent transfer density and light resistance.

[0002]

2. Description of the Related Art Recently, thermal printers, especially dye thermal transfer printers, which can print compact and clear full-color images, have been attracting attention. This dye thermal transfer printer is often used for video printers as a mainstream of small non-impact full color printers.

In the dye thermal transfer printer, a desired image is formed by superposing the dye-coated surface of the receiving sheet on the dye-coated surface of the ink sheet in which the dye inks of yellow, magenta and cyan are coated on the film. By the heat supplied from the thermal head in accordance with the electric signal corresponding to, an image is formed by transferring and dyeing the sublimation dye from the ink sheet from a required location to a required density.

A receiving sheet capable of forming a clear image when used in a printer using such a thermal head has been developed. For example, it is known to use a stretched film containing a thermoplastic polymer material such as polyolefin as a main component and having a void structure as a base material of a receiving sheet. These receiving sheets have a uniform thickness, are flexible, and have a uniform thermal conductivity due to their small thermal conductivity, etc., as compared with those based on a paper mainly composed of cellulose fibers. The advantage is that

However, when the stretched film is heat-transferred to a heat-transfer receiving sheet using the substrate as a base material, latent strain remaining in the stretched sheet becomes apparent by heating,
The stretched film shrinks due to heat, resulting in curls and wrinkles on the receiving sheet, which causes running troubles.
There were drawbacks such as a marked decrease in the commercial value of prints.

In order to solve the above problems, a material having a small heat shrinkability such as paper is used as a core material, and the stretched film is laminated and adhered to one surface of the core material to form a base material of a receiving sheet. It is known. However, when paper containing pulp as a main component was used as the core material, the core material expanded and contracted due to humidity, which caused curling. As a measure to prevent this curl, the stretched film is attached to both surfaces of the core material to form a base material.

On the other hand, in order to receive a dye and reproduce an image vividly on a receiving sheet, a receiving layer having a high dye-dyeability is required. As the resin used for the receiving layer, polyester resins, vinyl chloride-vinyl acetate copolymers, cellulose derivative resins, polycarbonate resins and the like are known.
However, resins that are believed to have good affinity for dyes, that is, resins that have aromatic groups and / or unsaturated bonds, generally have high print densities,
When this is compared with a resin having neither an aromatic group nor an unsaturated bond, or a resin having a low content thereof, it has been recognized that the light resistance of the obtained image is extremely poor.

In recent years, there has been a further demand for improvement in print density and higher printing speed, and in order to solve these problems, higher sensitivity of the receiving sheet is required. In order to increase the sensitivity of the receiving sheet, efforts have been made to improve the heat insulating property of the receiving sheet and / or to improve the dyeing property of the receiving layer. For example, as a method for improving the light resistance of a dye image, JP-A-5-139057 describes the use of various UV absorbers having two or more UV absorbing groups, but only such UV absorbers are used. It was not always possible to obtain sufficient light resistance of the dye transfer image.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of conventional dye transfer sheets for thermal transfer (hereinafter referred to as "receptor sheets"), and when used in a thermal printer, print images transferred to the receiving surface. It is intended to provide a receiving sheet which has a high density, is clear, and has excellent light resistance.

[0010]

In view of the present situation, the inventors of the present invention have diligently studied to achieve the above object, and as a result,
By containing an ultraviolet absorber and an adipic acid ester compound in the image receiving layer, an image with improved density and light resistance can be obtained in recording by a thermal transfer printer as compared with a conventional receiving sheet, and recording running property is also improved. The present invention has been completed and the present invention has been completed. That is, the thermal transfer receiving sheet according to the present invention is a thermal transfer receiving sheet formed by forming an image receiving layer on at least one side of a sheet-shaped substrate, wherein the image receiving layer contains an ultraviolet absorber and an adipic acid ester compound. It is characterized by doing.

[0011]

In general, the receiving sheet used in the dye thermal transfer system is provided with a dye-dyeable image-receiving layer and, if necessary, an antistatic layer and / or an anti-fusing layer on at least one side of a base sheet. It has a different configuration. The base sheet used in the receiving sheet of the present invention may be a laminate of plastic sheets. In this case, a laminated structure capable of avoiding thermal deformation when the receiving sheet is printed. Has become. In the present invention, synthetic paper is a typical example of the plastic sheet used as the base sheet.

A stretched void structure film containing an inorganic pigment and a thermoplastic resin such as polyolefin as main components is known as synthetic paper and is used for printing and writing printers. It is also known that when this synthetic paper is used as a receiving sheet of a thermal transfer printer including a dye thermal transfer system, a uniform and clear transferred image can be obtained. In a recording operation by a heating means such as a thermal head, an image is formed by heating from one side of the receiving sheet in any method such as a sublimation dye transfer method and a leuco dye coloring method, so that the front and back surfaces of the receiving sheet are uneven. Curl may occur due to heat shrinkage. However, the occurrence of curl in the receiving sheet can be controlled by simply laminating the sheets having a small heat shrinkage rate and using them as the receiving sheet.

The synthetic paper may be manufactured by laminating a thermoplastic resin containing an inorganic pigment on a base film which is uniaxially stretched in the longitudinal direction and stretching it in the transverse direction.
There is known a method of providing a biaxially stretched base material containing many inorganic pigments with a surface coat layer for improving printability. In either case, stretching causes microvoids in the stretched resin.

Therefore, such a synthetic paper for a sheet-like substrate has a structure in which a biaxially stretched thermoplastic resin film is used as a base film and a uniaxially stretched thermoplastic resin paper-like layer film is laminated on the surface thereof. are doing. The paper-like layer film contains filler particles, and the stretching thereof forms microvoids in the vicinity of the filler particles, so that it has good writability and a texture close to that of natural paper. The inorganic pigment used as the filler for the paper-like layer film is selected from, for example, white clay, talc, asbestos, gypsum, barium sulfate, diatomaceous earth, silicon oxide and other white pigments, and they are used alone or in combination.

The thermoplastic resin used in the synthetic paper for a sheet-like substrate used in the present invention is a polyolefin resin, for example, a homo (homo) polymer or copolymer of ethylene, propylene or butene-1, and polyvinylidene. Resins such as vinylidene chloride homopolymers or copolymers, styrene homopolymers or copolymers, polyesters and nylons can be used alone or as a mixture. Further, this resin for a base film may contain a stabilizer, a plasticizer, a filler, a pigment and other auxiliary materials, if necessary, in a stretchable range. It is preferable that the base film contains a filler in a proportion of 0 to 3% by weight. If the amount of the filler is more than 3% by weight, the mechanical strength of the obtained receiving sheet may be insufficient.

The thermoplastic resin used for forming the paper-like layer film may be the same as or different from the resin for the base film, from the above. Generally, the paper-like layer film contains a filler in a proportion of 5 to 60% by weight. If the content of the filling material is less than 5% by weight, the characteristics of the synthetic paper, that is, good writability, printability, and feel may not be exhibited, and if it exceeds 60% by weight, the paper-like material may not be formed. The filler comes to fall off significantly from the layered film, and further, the mechanical strength of the paper-like layer film is insufficient, and cracks may occur in the paper-like layer film during stretching.

In the sheet-shaped base material used in the present invention, other sheets may be laminated on the synthetic paper containing the above-mentioned thermoplastic resin stretched sheet. It is preferable to use a film having a relatively high heat resistance, for example, a film of polyethylene terephthalate. As the laminating film, other various synthetic resin films such as polyvinyl chloride, polyvinylidene chloride, polyethylene, and polystyrene films can be used depending on the use conditions.

On the surface of the receiving sheet of the present invention, an image receiving layer containing as a main component a material capable of receiving and holding a coloring material transferred from the ink sheet is formed.
In the dye thermal transfer printer sheet of the present invention, the image receiving layer is a dyeing layer and contains a resin having good dyeability as a main component to a thermal transfer dye such as a sublimable disperse dye. Conventionally, as the dyeing resin having both the dyeing property, the required mechanical strength and the required heat resistance, for example, polyester, vinyl chloride-vinyl acetate copolymer, cellulose derivative, and polycarbonate are selected. Thermoplastics have been used.

In order to improve the performance of the receiving sheet to obtain a high-quality and high-density transferred image with high sensitivity, a dye transfer layer having a high dye transfer speed and transfer amount and good storage stability. Is being studied. For example, Japanese Patent Laid-Open No. 62-2446
Japanese Unexamined Patent Publication No. 96 discloses a polyester resin modified with a phenyl group-containing polyol as a dye-dyeing resin.

In the receiving sheet of the present invention, a receiving layer for receiving the dye of the ink ribbon is provided on the sheet-shaped substrate, and if necessary, a back coating layer provided on the opposite surface to which the receiving layer is provided. You may have. An intermediate layer may be provided between the sheet-shaped substrate and the receiving layer. The sheet-shaped substrate used in the present invention has a thickness of 20 to 300 μm.
It is preferable to have a thickness of. This thickness is 20 μm
When it is less than 1, the mechanical strength of the resulting receiving sheet becomes insufficient, and its hardness and repulsive force against deformation become insufficient, and it is impossible to sufficiently prevent curling of the receiving sheet during printing. May occur.
On the other hand, if the thickness exceeds 300 μm, the thickness of the receiving sheet obtained may be excessive. In a printer having a predetermined volume, the receiving sheet storage capacity is limited, and an increase in the thickness of the receiving sheet naturally leads to a decrease in the number of receiving sheets stored in the printer. Further, in this case, in order to accommodate a predetermined number of receiving sheets, it is necessary to increase the volume of the printer, which makes it difficult to make the printer compact.

In the present invention, as a result of intensive studies on an image-receiving layer having a good dye-dyeability, an ultraviolet absorber and an adipic acid ester compound were used in an image-receiving layer containing a dye-dyeable resin as a main component. It has been found that the combined use can remarkably improve the transfer density and the light resistance of the resulting image on the receiving layer.

As the ultraviolet absorber used in the present invention, commonly used salicylic acid-based, benzophenone-based, benzotriazole-based, hindered amine-based, Ni
It can be selected from salt-based, cyanoacrylate-based, oxalic acid anilide-based, and the like. Specific examples thereof include salicylic acid-based ultraviolet absorbers such as phenyl salicylate, p-t-butylphenyl salicylate, and p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4. -Octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4, 4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4)
-Hydroxy-5-benzoylphenyl) methane and other benzophenone-based UV absorbers, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2-
(2'-hydroxy-5'-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'
-Di-t-butylphenyl) benzotriazole, 2-
(2'-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2-
(2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-
Hydroxy-3 ′, 5′-di-t-amylphenyl) benzotriazole, 2- (2′-hydroxy-4′-octoxyphenyl) benzotriazole, 2- [2′-
Hydroxy-3 '-(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5'-methylphenyl]
Benzotriazole, 2,2-methylenebis [4-
(1,1,3,3-tetramethylbutyl) -6- (2H
-Benzotriazol-2-yl) phenol], and methyl-3- [3- (2H-benzotriazole-2
-Yl) -5-t-butyl-4-hydroxyphenyl]
A benzotriazole-based ultraviolet absorber such as a reaction product obtained by a condensation reaction of propionate and polyethylene glycol, and phenyl-4-piperidinyl carbonate,
Bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis (N-methyl-2,2,6,6-)
(Tetramethyl-4-piperidinyl) sebacate, Tinuvin 144 and Tinuvin 622LD manufactured by Ciba-Geigy,
Hindered amine-based UV absorbers such as CHIMASORB 944LD are shown. Among these, the benzotriazole-based ultraviolet absorber is preferably used because it has a small amount and a high effect of combined use with the adipic acid ester compound, and is particularly preferably methyl-3- [3- (2H-benzotriazole-2-
Yl) -5-t-butyl-4-hydroxyphenyl] propionate and a polyethylene glycol condensation product having a degree of polymerization n of polyethylene glycol of 5 to 7 and a molecular weight of about 600 or more (for example, trademark: TINU).
VIN-1130, manufactured by Ciba Geigy) is preferably used. The amount of the ultraviolet absorber used is preferably about 5 to 30% by weight based on the total solid content of the receiving layer. If it is less than 5% by weight, the effect of light resistance is insufficient, and if it exceeds 30% by weight, not only the effect is saturated and it becomes uneconomical, but also the adhesiveness on the receiving layer surface causes unstable running such as printing. May be.

The adipic acid ester compound used in the present invention is produced by the reaction of adipic acid and a hydroxyl group-containing compound. The hydroxyl group-containing compound is an organic compound having at least one hydroxyl group, and examples thereof include higher aliphatic monohydric alcohols, diols, polyester polyol compounds, polyether polyol compounds, and polyvalent aliphatic compounds. It can be selected from alcohols such as glycerin. The compound produced by the reaction of adipic acid with a hydroxyl group-containing compound includes adipic acid monoester, adipic acid diester, and polyadipate ester. The amount of the adipic acid ester compound used is preferably about 1 to 30% by weight based on the total solid content of the receiving layer. If it is less than 1% by weight, the effect of light resistance is insufficient, and if it exceeds 30% by weight, not only the effect is saturated and it becomes uneconomical, but also tackiness may occur on the receiving layer surface. In addition, in order to improve the light resistance of the dye, the receptive layer may further include phenol-based and aromatic amine-based antioxidants, sulfide-based and phosphorus-based hydroperoxide decomposers, and oxalic acid-based and hydrazide-based heavy metal deactivators. One or more can be used together.

In the present invention, the dye-staining resin used in the image receiving layer is not particularly limited, but a resin containing an aromatic group and / or an unsaturated bond such as polyester or polycarbonate is preferable. used. Conventionally, such resins have been considered to have remarkably inferior light resistance of dye-dyed images, but in the present invention, an ultraviolet absorber and an adipic acid ester compound are used in combination in a receiving layer using these resins. By including it,
It is possible to improve both the transfer density and the lightfastness of the image on the receiving layer.

In the receiving sheet of the present invention, the thickness of the image receiving layer for receiving the thermal transfer image is preferably 1 to 10 μm, more preferably 2 to 7 μm. If the receiving layer is too thin, the density and sensitivity of the image may be lowered, or the gloss of the printed surface may be lowered, which may cause inconvenience. If it is too thick, the image-receiving effect is saturated, which is not only uneconomical, but the strength of the receiving layer may be rather decreased.

In the receiving sheet of the present invention, for the purpose of preventing fusion with the ink ribbon due to heat during printing,
If necessary, a resin crosslinking agent, a slip agent, a release agent, a pigment, etc. can be added to the image receiving layer. As the release agent, for example, a polydimethylsiloxane copolymer resin (trade name: SH-3746, manufactured by Toray Dow Corning Silicone) or the like can be used. Further, plasticizers, pigments, fluorescent dyes, dyes such as blue and violet, and antioxidants can be added to the image receiving layer. These additives may be mixed in the coating liquid for forming the receiving layer as its components and applied, or may be applied as a separate coating layer on the receiving layer.

In the receiving sheet of the present invention, on the surface (rear surface) of the sheet-shaped substrate opposite to the image receiving layer, the running property is improved, static electricity is prevented, and the receiving layer is prevented from being damaged by rubbing between the receiving sheets. , Furthermore, when the printed receiving sheets are laid one on top of the other, for the purpose of preventing the migration of dye from the receiving layer to the back surface of the receiving sheet that is in contact with it,
A back coating layer may be formed.

The back coating layer preferably contains a release agent in order to prevent dye migration. As a release agent,
Silicone-based, fluorine-based, phosphoric acid ester-based, fatty acid ester-based, alcohol-based, amide-based, metal image soap-based, natural fat-and-oil-based, fatty acid-based, mineral oil-based and the like can be used. The back coating layer contains an organic resin effective as a binder, and this organic resin is also effective for the running property of the receiving sheet and the prevention of scratches on the image receiving surface. As such an organic resin, an acrylic resin, an epoxy resin, a polyester resin, a phenol resin, an alkyd resin, a urethane resin, a melamine resin, or a reaction cured product of these resins can be used. Further, these organic resins are preferably selected from those having an MFT of 50 ° C. or higher and those having a Tg of 20 ° C. or higher.

Further, various conductive agents can be added to the back surface coating layer of the present invention for antistatic treatment. It is preferable to use a cationic polymer as the conductive agent. As the cationic polymer, generally,
Polyethyleneimine, an acrylic polymer containing a cationic monomer, a cation-modified acrylamide polymer, and cationic starch can be used.

The image receiving layer and other coating layers of the receiving sheet of the present invention include bar coaters, gravure coaters, comma coaters, blade coaters, air knife coaters,
Coating using a coater such as a gate roll coater,
It can be formed by drying.

The intermediate layer formed between the sheet-like substrate and the image-receiving layer improves the adhesive force between the image-receiving layer and the sheet-like substrate, antistatic effect, cushioning property, heat insulating property and the like. Any one having at least a function may be used.

[0032]

The present invention will be described in more detail with reference to the following examples. "Parts" means "parts by weight of solid content" unless otherwise specified.
Is. Example 1 100 μm thick polyethylene terephthalate (PE
T) On the back of the film, a 60 μm-thick multilayer structure film (trade name: YUPO FPG60, made by Oji Yuka Synthetic Paper) biaxially stretched with a polyolefin containing an inorganic pigment as a main component,
A polyester-based adhesive was used for lamination by a dry lamination method. Paint-1 was applied as an image receiving layer on the side of the 60 [mu] m multilayer structure film at a coating amount of solid content of 5 g / m < ² > by a die coating method, and dried to form an image receiving layer. Further, on the polyethylene terephthalate (PET) film side of the transparent film substrate, a coating material-2 having the following composition is applied by a die coating method at a coating amount of solid content of 0.1 g / m ² and dried, A back cover layer was formed to obtain a receiving sheet. Paint-1 Polyester resin (trademark: Byron 200, manufactured by Toyobo) 52 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts Methyl-3- [3- (2H-benzotriazol-2-yl) -5 -T-Butyl-4-hydroxyphenyl] propionate / polyethylene glycol condensate (benzotriazole ultraviolet absorber, trademark: TINUVIN-1130, manufactured by Ciba Geigy) 6 parts adipic acid ester compound (trademark: W4000, molecular weight 4000, Dainippon Ink) 27 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 12 parts Toluene: methyl ethyl ketone =
It was dissolved in a 5: 1 mixed solvent to obtain a 15% solution. 100 parts of paint-2 acrylic silicone block copolymer (trademark: MODIPER FS700, manufactured by NOF CORPORATION) was dissolved in denatured ethanol to prepare a 10% solution.

Example 2 Paint-instead of Paint-1 in the formation of the dye-receiving layer
A receiving sheet was obtained in the same manner as in Example 1 except that 3 was used. Paint-3 Polycarbonate resin (trademark: Panlite L1225, manufactured by Teijin Chemicals) 56 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts Phenyl-4-piperidinyl carbonate (hindered amine ultraviolet absorber, trademark: TINUVIN-744, manufactured by Ciba Geigy) 27 parts Adipate compound (trademark: W2610, molecular weight 2600, manufactured by Dainippon Ink) 2 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 12 parts Mixture of the above components Was dissolved in carbon tetrachloride to obtain a 10% solution.

Example 3 Paint-instead of Paint-1 in the formation of the dye-receiving layer
A receiving sheet was obtained in the same manner as in Example 1 except that No. 4 was used. Paint-4 vinyl chloride-vinyl acetate copolymer (trademark: VYHH, manufactured by Union Carbide) 56 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts 2,2 ', 4,4'-tetrahydroxybenzophenone (Benzophenone-based UV absorber, trademark: UVINUL D-50, manufactured by BASF) 10 parts Dioctyl adipate (manufactured by Tokyo Kasei) 15 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 16 parts Toluene a mixture of the above components. : Methyl ethyl ketone =
It was dissolved in a 5: 1 mixed solvent to prepare a 15% solution.

In each of Comparative Examples 1 to 4, a receiving sheet was prepared in the same manner as in Example 1. However, coating materials 5 to 8 having the following compositions were used as the coating liquid for forming the receiving layer. Comparative Example 1 Paint-5 Polyester resin (trademark: Byron 200, manufactured by Toyobo) 52 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts Methyl-3- [3- (2H-benzotriazol-2-yl) ) -5-t-Butyl-4-hydroxyphenyl] propionate / polyethylene glycol condensate (benzotriazole-based ultraviolet absorber, trademark: TINUVIN-1130, manufactured by Ciba Geigy) 6 parts Dibutyl phthalate (manufactured by Tokyo Kasei) 15 parts Isocyanate (Trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 12 parts Toluene: methyl ethyl ketone =
It was dissolved in a 5: 1 mixed solvent to obtain a 15% solution.

Comparative Example 2 Paint-6 Polycarbonate resin (trademark: Panlite L1225, manufactured by Teijin Kasei) 56 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts Phenyl-4-piperidinyl carbonate (hindered amine type) UV absorber, trademark: TINUVIN-744, manufactured by Ciba Geigy) 27 parts Sebacate ester compound (molecular weight 8000, trademark: P202, manufactured by Dainippon Ink) 2 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 12 Parts A mixture of the above components was dissolved in carbon tetrachloride to give a 10% solution.

Comparative Example 3 Paint-7 Vinyl Chloride-Vinyl Acetate Copolymer (Trademark: VYHH, Union Carbide) 61 parts Silicone resin (Trademark: SH3746, Toray Dow Corning Silicone) 3 parts 2, 2 ', 4, 4 '-Tetrahydroxybenzophenone (benzophenone-based UV absorber, trademark: UVINUL D-50, manufactured by BASF) 15 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 16 parts Toluene: methyl ethyl ketone =
It was dissolved in a 5: 1 mixed solvent to obtain a 15% solution.

Comparative Example 4 Paint-8 Vinyl chloride-vinyl acetate copolymer (trademark: VYHH, manufactured by Union Carbide) 61 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone) 3 parts Dioctyl adipate (manufactured by Tokyo Kasei) ) 20 parts Isocyanate (trademark: Coronate 2014, manufactured by Nippon Polyurethane Industry Co., Ltd.) 16 parts A mixture of the above components is toluene: methyl ethyl ketone =
It was dissolved in a 5: 1 mixed solvent to prepare a 15% solution.

Evaluation Test (1) Commercially available sublimation color video printers (trademark: CVP-G) were prepared from the receiving sheets of Examples 1 to 3 and Comparative Examples 1 to 4.
(7, manufactured by Sony) was used to print a pattern of 12 gradations. The transfer density was evaluated by measuring the maximum density with a Macbeth densitometer RD-914, and the results are shown in the table. (2) The light resistance test of the transferred image was performed using an Atlas Fade Meter under the conditions of 63 ° C., 50% RH and 72 hours. The light resistance was evaluated by obtaining the residual ratio of the image density at the initial density D = 1.0 and evaluating according to the following criteria,
The results are shown in Table 1. [Lightfastness Evaluation Criteria] Image density residual rate: 85% or more → ◎: 75% or more to less than 85% → ○: 60% or more to less than 75% → △: Less than 60% → ×

[0040]

[Table 1]

[0041]

According to the present invention, it is possible to obtain a novel thermal transfer receiving sheet capable of receiving an image having a high transfer density and excellent light resistance. A receiving sheet having such performance is extremely useful in practice.

Claims (1)

[Claims] 1. A thermal transfer receiving sheet comprising an image receiving layer formed on at least one side of a sheet-shaped substrate, wherein the image receiving layer contains an ultraviolet absorber and an adipic acid ester compound. Receiving sheet.