JP2021160349A - Combination of thermal transfer sheet and thermal transfer image receiving sheet - Google Patents

Abstract

To provide a combination of a thermal transfer sheet and a thermal transfer image receiving sheet capable of manufacturing a printed matter having a highly glossy feeling.SOLUTION: In a combination of a thermal transfer sheet 10 and a thermal transfer image receiving sheet 20, the thermal transfer sheet includes a first substrate 11 and a transfer layer 12 and satisfies a following expression (1-1): (20 degree glossiness of the thermal transfer image receiving sheet)-(20 degree glossiness of the thermal transfer image receiving sheet after transfer of the transfer layer)≤200%(1-1)SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a combination of a thermal transfer sheet and a thermal transfer image receiving sheet.

Conventionally, various image forming methods are known. Among them, the sublimation thermal transfer method has excellent reproducibility of neutral colors and gradations because the density gradation can be freely adjusted, and can form a high-quality image comparable to silver halide photography.

In the sublimation type thermal transfer method, a thermal transfer sheet having a color material layer and a thermal transfer image receiving sheet having a receiving layer are superposed, and then the thermal transfer sheet is heated by a thermal head provided in the printer to cause a sublimation dye in the color material layer. Is transferred to the receiving layer provided in the thermal transfer image receiving sheet to form an image, and a printed matter is obtained. Further, the transfer layer is transferred from the thermal transfer sheet onto the receiving layer of the printed matter produced in this manner to improve the durability of the printed matter.

In recent years, a wide variety of designs have been required for printed materials. For example, a printed matter is required to have a high glossiness. Then, in order to obtain a printed matter having a high glossiness, a thermal transfer image receiving sheet provided with a glossy layer has been proposed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-118152

However, when the transfer layer is transferred onto a printed matter having a glossy layer, the glossiness of the printed matter may be impaired.

An object of the present disclosure is to provide a combination of a thermal transfer sheet and a thermal transfer image receiving sheet capable of producing a printed matter having a high glossiness.

The combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure is
The thermal transfer sheet comprises a first substrate and a transfer layer.
The following equation (1-1) is satisfied.
(20-degree glossiness of thermal transfer image-receiving sheet)-(20-degree glossiness of thermal transfer image-receiving sheet after transfer of transfer layer) ≤200% (1-1)

According to the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure, it is possible to produce a printed matter having a high glossiness.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure. FIG. 2 is a schematic cross-sectional view showing an embodiment of a thermal transfer sheet constituting a combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure. FIG. 3 is a schematic cross-sectional view showing an embodiment of a thermal transfer sheet constituting a combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure.

An embodiment of the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of the above combination, and FIGS. 2 and 3 are schematic cross-sectional views showing an embodiment of a thermal transfer sheet.

As shown in FIG. 1, the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure includes the thermal transfer sheet 10 and the thermal transfer image receiving sheet 20. Hereinafter, the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure is also simply referred to as "combination of the present disclosure".

In one embodiment, as shown in FIG. 1, the thermal transfer sheet 10 includes a first base material 11 and a transfer layer 12. In one embodiment, the transfer layer 12 includes at least a release layer 13, as shown in FIG.
In one embodiment, the transfer layer 12 includes a heat seal layer 14 on the release layer 13, as shown in FIG.
In one embodiment, the transfer layer 12 includes an intermediate layer 15 between the release layer 13 and the heat seal layer 14, as shown in FIG.
In one embodiment, as shown in FIGS. 1 to 3, the thermal transfer sheet 10 includes a back layer 16 on the surface of the first base material 11 opposite to the surface on which the transfer layer 12 is provided.
In one embodiment, the thermal transfer sheet 10 includes a color material layer so as to be surface-sequential with the transfer layer 12 (not shown). The thermal transfer sheet 10 may include a plurality of color material layers.

In one embodiment, as shown in FIG. 1, the thermal transfer image receiving sheet 20 includes a second base material 21, a glossy layer 22, and a receiving layer 23.
In one embodiment, the thermal transfer image receiving sheet 20 includes a primer layer between arbitrary layers (not shown). In one embodiment, the thermal transfer image receiving sheet 20 includes a porous layer between arbitrary layers (not shown). In one embodiment, the thermal transfer image receiving sheet 20 includes an adhesive layer between arbitrary layers (not shown).

The combination of the present disclosure satisfies the following formula (1-1).
(20-degree glossiness of thermal transfer image-receiving sheet)-(20-degree glossiness of thermal transfer image-receiving sheet after transfer of transfer layer) ≤200% (1-1)
Preferably, the combination of the present disclosure satisfies the following formula (1-2).
(20-degree glossiness of thermal transfer image-receiving sheet)-(20-degree glossiness of thermal transfer image-receiving sheet after transfer of transfer layer) ≤145% (1-2)
More preferably, the combination of the present disclosure satisfies the following formula (1-3).
(20-degree glossiness of thermal transfer image-receiving sheet)-(20-degree glossiness of thermal transfer image-receiving sheet after transfer of transfer layer) ≤100% (1-3)
The 20-degree glossiness of the thermal transfer image-receiving sheet, that is, the 20-degree glossiness of the receiving layer of the thermal transfer image-receiving sheet before the transfer layer is transferred is preferably 400% or more, more preferably 600% or more, still more preferably 800% or more. .. The upper limit of the 20-degree glossiness of the thermal transfer image receiving sheet is, for example, 1600%, preferably 1300% in one embodiment.

In the present disclosure, the 20 degree glossiness is measured by using the following spectrophotometer or an equivalent device in accordance with JIS Z 8741 (issued in 1997).
(Spectrophotometer)
・ Rhopoint IQ-S manufactured by Konica Minolta Co., Ltd.
・ Reflection angle: 20 degrees

The combination of the present disclosure preferably satisfies the following formula (2), and more preferably satisfies the following formula (2-1). As a result, the glossiness of the manufactured printed matter can be further improved.
DOI ≧ 47.5 (2) of the thermal transfer image receiving sheet after transferring the transfer layer
DOI ≧ 60 (2-1) of the thermal transfer image receiving sheet after transferring the transfer layer
The upper limit of the DOI is 100 in principle of measurement, but in one embodiment, the upper limit of the DOI may be, for example, 95.

In the present disclosure, map sharpness (DOI) is measured in accordance with ASTM D 5767 by using the spectrophotometer or equivalent.

Hereinafter, each layer included in the thermal transfer sheet and the thermal transfer image receiving sheet will be described.

[Thermal transfer sheet]
<First base material>
The first base material is not limited as long as it has heat resistance to the thermal energy applied during thermal transfer, and has mechanical strength and solvent resistance that can support the transfer layer and the like provided on the first base material. Can be used.

As the first base material, for example, a film made of a resin material (hereinafter, simply referred to as "resin film") can be used. Examples of the resin material include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), 1,4-polycyclohexylene methylene terephthalate and terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer. Such as polyester; Nylon 6 and Nylon 6,6 and other polyamides; Polyethylene (PE), Polypropylene (PP) and Polymethylpentene and other polyolefins; Polyvinyl chloride, Polyvinyl alcohol (PVA), Polyvinyl acetate, Vinyl chloride-Acetic acid. Vinyl resins such as vinyl copolymers, polyvinylacetacetals, polyvinylbutyral and polyvinylpyrrolidone (PVP); polyacrylates, polymethacrylates, polyurethane (meth) acrylates, polyester (meth) acrylates, polyether (meth) acrylates and epoxy (meth). ) (Meta) acrylic resin such as acrylate; Iimide resin such as polyimide and polyetherimide; Cellophane, cellulose acetate, nitrocellulose, cellulose nitrate, cellulose acetopropionate, cellulose acetate propionate (CAP), cellulose acetate hydro Examples thereof include cellulose resins such as dienphthalate, cellulose acetate and cellulose acetate butyrate (CAB); styrene resins such as polystyrene (PS); polycarbonates; and ionomer resins.
Among the above-mentioned resin materials, polyester is preferable, PET or PEN is more preferable, and PET is particularly preferable, from the viewpoint of heat resistance and mechanical strength.
In the present disclosure, "(meth) acrylic" includes both "acrylic" and "methacryl". Further, "(meth) acrylate" includes both "acrylate" and "methacrylate".

The above-mentioned resin film laminate can also be used as the first base material. The laminate of the resin film can be produced by using a dry lamination method, a wet lamination method, an extraction method, or the like.

When the first base material is a resin film, the resin film may be a stretched film or an unstretched film. From the viewpoint of strength, a stretched film stretched in the uniaxial direction or the biaxial direction is preferable.

The thickness of the first base material is preferably 2 μm or more and 25 μm or less, and more preferably 3 μm or more and 16 μm or less. As a result, the mechanical strength of the first base material and the transfer of thermal energy during thermal transfer can be improved.

<Transfer layer>
The thermal transfer sheet includes a transfer layer. In one embodiment, the transfer layer includes a release layer as a layer located closest to the first substrate side.
In one embodiment, the transfer layer comprises a heat seal layer on top of the release layer.
In one embodiment, the transfer layer comprises an intermediate layer between the release layer and the heat seal layer.

(Release layer)
The release layer contains a resin material and particles.
Examples of the resin material include polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin, polyurethane, silicone wax, silicone resin, silicone-modified resin, and fluororesin. And fluorine-modified resin.
Among these, (meth) acrylic resin or styrene resin is preferable from the viewpoint of transferability of the transfer layer and glossiness of the printed matter to be produced. From the viewpoint of the durability of the transfer layer, a (meth) acrylic resin is preferable.
The release layer may contain one or more resin materials.

The glass transition temperature (Tg) of the resin material is preferably 40 ° C. or higher and 115 ° C. or lower, more preferably 50 ° C. or higher and 110 ° C. or lower, and particularly preferably 80 ° C. or higher and 108 ° C. or lower. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.
In the present disclosure, Tg is a value obtained by differential scanning calorimetry (DSC) under the condition of a heating rate of 3 ° C./min in accordance with JIS K 7121: 2012.

The weight average molecular weight (Mw) of the resin material is preferably 20,000 or more and 50,000 or less, more preferably 23,000 or more and 48,000 or less, and particularly preferably 24,000 or more and 28,000 or less. Thereby, the glossiness and durability of the manufactured printed matter can be further improved. In the present disclosure, Mw means a value measured by gel permeation chromatography using polystyrene as a standard substance, and is measured in accordance with JIS-K-7252-1: 2008.

The content of the resin material in the release layer is preferably 50% by mass or more and 99% by mass or less, and more preferably 70% by mass or more and 98% by mass or less. Thereby, the transferability and durability of the transfer layer can be further improved.

The release layer contains particles. As a result, the durability of the printed matter to be manufactured can be improved.
The release layer may contain one or more particles.

The average particle size of the particles is preferably 0.7 μm or more and 8 μm or less, more preferably 1 μm or more and 6 μm or less, and particularly preferably 1.3 μm or more and 5.5 μm or less. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.
In the present disclosure, the average particle size is a number average particle size measured using a laser diffraction type particle size distribution measuring device (manufactured by Shimadzu Corporation, SALD-2000J) or an equivalent device.

The specific surface area of the particles, 2m ² / g or more 20 m ² / g or less are preferred, 5 m ² / g or more 20 m ² / g and more preferably less, 5 m ² / g or more 10 m ² / g or less is more preferable. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.
In the present disclosure, the specific surface area of particles is measured according to the BET method.

The particles may be inorganic particles or organic particles.
Examples of the inorganic particles include talc, titanium oxide and calcium carbonate.
Examples of the organic particles include particles composed of a resin material such as polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate or fluororesin. As the organic particles, polyethylene wax or the like may be used.

When silica is used as the inorganic particles in the release layer, the durability such as glossiness and scratch resistance of the printed matter to be produced may not be sufficient. Among the above-mentioned materials, the use of talc can improve the glossiness and scratch resistance of the printed matter to be produced.

The content of particles with respect to 100 parts by mass of the total amount of the resin material contained in the release layer is preferably 1 part by mass or more and 13 parts by mass or less, and more preferably 1.5 parts by mass or more and 5 parts by mass or less. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.

The release layer may contain an additive. Examples of the additive material include a filler, a plastic material, an antistatic material, an ultraviolet absorber, a mold release material and a dispersant material. The release layer may contain one or more additives.

The thickness of the release layer is preferably 0.1 μm or more and 5 μm or less, more preferably 0.3 μm or more and 4 μm or less, and particularly preferably 0.4 μm or more and 3.5 μm or less. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.

For the release layer, the above material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto a first base material or the like to form a coating film, which is dried. Can be formed by
As the coating means, for example, known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method or a rod coating method can be used.

(Heat seal layer)
In one embodiment, the transfer layer comprises a heat seal layer on top of the release layer.
In one embodiment, the heat seal layer comprises a resin material. Examples of the resin material include ultraviolet absorbing resins, (meth) acrylic resins, vinyl resins such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymers, epoxy resins, polyesters, polycarbonates, butyral resins, gelatins and cellulose resins. Also, polyamide can be mentioned. The heat seal layer may contain one or more resin materials.

Among the above, an ultraviolet absorbing resin is preferable. Examples of the ultraviolet absorbing resin include a resin obtained by reacting or binding a reactive ultraviolet absorber with a thermoplastic resin or an ionizing radiation curable resin, or a reactive ultraviolet absorber, styrene and (meth) acrylic. A copolymer with a polymerizable monomer such as an acid ester can be used.

Examples of the reactive ultraviolet absorber include addition polymerization to an organic ultraviolet absorber such as a salicylate compound, a benzophenone compound, a benzotriazole compound, a substituted acrylonitrile compound, a nickel chelate compound, or a hindered amine compound. Compounds with a sex double bond or a reactive group introduced can be used.

Examples of the addition-polymerizable double bond include a vinyl group, an acryloyl group and a methacryloyl group. Examples of the reactive group include an alcoholic hydroxyl group, an amino group, a carboxyl group, an epoxy group and an isocyanate group.

The Tg of the ultraviolet absorbing resin is preferably 70 ° C. or higher and 120 ° C. or lower, and more preferably 80 ° C. or higher and 110 ° C. or lower.

The Mw of the ultraviolet absorbing resin is preferably 15,000 or more and 50,000 or less, and more preferably 18,000 or more and 43,000 or less.

The content of the ultraviolet absorbing resin in the heat seal layer is preferably 50% by mass or more and 90% by mass or less, and more preferably 53% by mass or more and 70% by mass or less.

In one embodiment, the heat seal layer comprises a UV absorber other than the UV absorbent resin. The ultraviolet absorber may be an inorganic material or an organic material. Examples of the inorganic material include oxides such as zinc, titanium, cerium, tin and iron. Examples of the organic material include benzophenone-based compounds, benzotriazole-based compounds, oxalic acid anilides-based compounds, cyanoacrylate-based compounds, and salicylate-based compounds.

In one embodiment, the heat seal layer comprises one or more particles. As a result, the occurrence of wrinkles on the printed matter can be suppressed, and the durability and blocking resistance can be improved.
The particles may be inorganic particles or organic particles.
Examples of the inorganic particles include silica, talc, titanium oxide and calcium carbonate.
Examples of the organic particles include particles composed of a resin material such as polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate or fluororesin. As the organic particles, polyethylene wax or the like may be used.
In one embodiment, among the particles, at least one selected from silica, talc and polyethylene wax is preferable. In one embodiment, among the particles, inorganic particles are preferable, and at least one selected from silica and talc is more preferable.

The average particle size of the particles is preferably 0.7 μm or more and 8 μm or less, more preferably 1 μm or more and 6 μm or less, and particularly preferably 1.3 μm or more and 5.5 μm or less. As a result, the balance between the glossiness and the wrinkle-suppressing property of the produced printed matter can be further improved.

The content of the particles in the heat seal layer is preferably 0.1% by mass or more and 8% by mass or less, and more preferably 0.1% by mass or more and 6% by mass or less.

In one embodiment, the heat seal layer comprises silica. As a result, the occurrence of wrinkles on the printed matter can be suppressed, and the durability and blocking resistance can be improved.

When the average particle size of silica is A (μm) and the thickness of the heat seal layer is B (μm), the heat seal layer containing silica preferably satisfies the following formula (3). As a result, the durability of the transfer layer and the adhesion to the transferred body can be improved.
0.5B ≤ A ≤ 3B (3)

The content of silica in the heat seal layer is preferably 0.1% by mass or more and 2% by mass or less, and more preferably 0.8% by mass or more and 1.8% by mass or less. As a result, wrinkles and blocking of the printed matter can be suppressed, and the adhesiveness with the image receiving paper can be improved.

In one embodiment, the heat seal layer comprises talc. As a result, the occurrence of wrinkles on the printed matter can be suppressed, and the durability and blocking resistance can be improved. The heat-sealing layer containing talc tends to be able to further reduce the difference in glossiness as compared with the heat-sealing layer containing silica, and thus to further improve the balance between wrinkle-suppressing property and glossiness of the printed matter.

When the average particle size of talc is AA (μm) and the thickness of the heat seal layer is B (μm), the heat seal layer containing talc preferably satisfies the following formula (4). As a result, the durability of the transfer layer and the adhesion to the transferred body can be improved.
0.5B ≤ AA ≤ 7B (4)

The content of talc in the heat seal layer is preferably 0.1% by mass or more and 8% by mass or less, more preferably 0.1% by mass or more and 6% by mass or less, and further preferably 0.1% by mass or more and 2% by mass or less. , 0.8% by mass or more and 1.8% by mass or less is particularly preferable. As a result, wrinkles and blocking of the printed matter can be suppressed, and the adhesiveness with the image receiving paper can be improved. Since the heat seal layer containing talc can further reduce the difference in glossiness, it is possible to set a large content of talc.

In one embodiment, the heat seal layer comprises polyethylene wax. As a result, the occurrence of wrinkles on the printed matter can be suppressed, and the durability and blocking resistance can be improved. The heat-sealing layer containing polyethylene wax can further reduce the difference in glossiness as compared with the heat-sealing layer containing silica, and therefore tends to further improve the balance between wrinkle-suppressing property and glossiness of the printed matter.

The number average molecular weight (Mn) of the polyethylene wax is preferably 300 or more and 10,000 or less, more preferably 400 or more and 5,000 or less, and further preferably 400 or more and 3,000 or less. In one embodiment, Mn is 800 or less from the viewpoint of further suppressing the occurrence of wrinkles in the printed matter. In the present disclosure, Mn means a value measured by gel permeation chromatography using polystyrene as a standard substance, and is measured in accordance with JIS-K-7252-1: 2008.

The content of polyethylene wax in the heat seal layer is preferably 0.1% by mass or more and 8% by mass or less, and more preferably 0.1% by mass or more and 6% by mass or less. As a result, wrinkles and blocking of the printed matter can be suppressed, and the adhesiveness with the image receiving paper can be improved. Since the heat seal layer containing polyethylene wax can further reduce the difference in glossiness, it is possible to set a large content of polyethylene wax.

The heat seal layer may contain the above additives.

The thickness of the heat seal layer is preferably 0.1 μm or more and 7 μm or less, and more preferably 0.2 μm or more and 2 μm or less. Thereby, the glossiness and durability of the manufactured printed matter can be further improved.

For the heat seal layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto a release layer or the like by the above-mentioned coating means to form a coating film. It can be formed by drying this.

(Middle layer)
In one embodiment, the transfer layer comprises an intermediate layer between the release layer and the heat seal layer. Thereby, the adhesion between these layers can be improved.

In one embodiment, the intermediate layer comprises a resin material. Examples of the resin material include polyester, vinyl resin, polyurethane, (meth) acrylic resin, polyamide, ether resin, butadiene resin such as polybutadiene and styrene-butadiene copolymer, polyol resin such as (meth) acrylic polyol, and cellulose resin. Can be mentioned. The intermediate layer may contain one or more resin materials.

In one embodiment, the intermediate layer comprises inorganic particles. Examples of the inorganic particles include alumina particles, silica particles, zirconia particles, tin oxide particles, magnesium carbonate particles, magnesium hydroxide particles and titanium oxide particles. Among these, alumina particles and silica particles are preferable. The intermediate layer may contain one or more inorganic particles.

The content of the inorganic particles with respect to the total mass of the resin material and the inorganic particles is preferably 5% by mass or more and 95% by mass or less, and more preferably 20% by mass or more and 80% by mass or less.
The intermediate layer may contain the above additives.

The thickness of the intermediate layer is, for example, 0.2 μm or more and 2 μm or less.

For the intermediate layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto a release layer or the like by the above-mentioned coating means to form a coating film. Can be formed by drying. In one embodiment, the intermediate layer can be formed using, for example, a coating liquid containing a resin material and colloidal inorganic particles. Examples of the colloidal inorganic particles include alumina sol, silica sol, zirconia sol, tin oxide sol, and titanium oxide sol.

<Back layer>
In one embodiment, the thermal transfer sheet includes a back layer on the surface of the first substrate where the transfer layer is not provided. As a result, sticking and wrinkles due to heating during thermal transfer can be suppressed.

In one embodiment, the back layer comprises a resin material. Examples of the resin material include cellulose resin, styrene resin, vinyl resin, polyester, polyurethane, polyamide, polycarbonate, polyimide, polyamideimide, chlorinated polyolefin, silicone-modified polyurethane, fluorine-modified polyurethane and (meth) acrylic resin. The back layer may contain one or more resin materials.

In one embodiment, the back layer contains, as a resin material, a two-component curable resin that is cured in combination with a curing agent such as an isocyanate compound. Examples of such a resin include polyvinyl acetals such as polyvinyl acetal and polyvinyl butyral.

In one embodiment, the back layer comprises inorganic or organic particles. As a result, sticking and wrinkles due to heating during thermal transfer can be further suppressed.

The thickness of the back layer is preferably 0.1 μm or more and 5 μm or less, and more preferably 0.5 μm or more and 2 μm or less. As a result, sticking, wrinkles, and the like can be suppressed while maintaining the transmissibility of thermal energy during thermal transfer.

For the back layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto the first base material by the above-mentioned coating means to form a coating film. Can be formed by drying.

(Color material layer)
In one embodiment, the thermal transfer sheet includes a colorant layer so as to be surface-sequential with the transfer layer.
The color material layer contains a color material.
The coloring material may be a pigment or a dye. The dye may be a sublimation dye.

Examples of coloring materials include carbon black, acetylene black, lamp black, black smoke, iron black, aniline black, silica, calcium carbonate, titanium oxide, cadmium red, cadmopone red, chrome red, vermilion, red iron oxide, and azo pigments. Alizarin Lake, Kinakridon, Cochineal Lake Perylene, Yellow Oaker, Aureolin, Cadmium Yellow, Cadmium Orange, Chrome Yellow, Zink Yellow, Naples Yellow, Nickel Yellow, Azo Dyes, Greenish Yellow, Ultramarine, Rocks Blue, Cobalt, Phthalocyanin , Anthracinone, indicoid, cinnabar green, cadmium green, chrome green, phthalocyanine, azomethine, perylene, aluminum pigment, as well as diarylmethane dye, triarylmethane dye, thiazole dye, merocyanine dye, pyrazolone dye, methine dye, indian aniline dye, Sublimation properties of acetophenone azomethine dyes, pyrazoloazomethine dyes, xanthene dyes, oxazine dyes, thiazine dyes, azine dyes, acrydin dyes, azo dyes, spiropyran dyes, indolinospiropirane dyes, fluorane dyes, naphthoquinone dyes, anthraquinone dyes, quinophthalone dyes, etc. Dyes can be mentioned. The color material layer may contain one type or two or more types of color material.

In one embodiment, the colorant layer comprises a resin material. Examples of the resin material include polyester, polyamide, polyolefin, vinyl resin, vinyl acetal resin, (meth) acrylic resin, cellulose resin, styrene resin, polycarbonate, phenoxy resin and ionomer resin. The coloring material layer may contain one type or two or more types of resin materials.

The coloring material layer may contain the above-mentioned additive.

The thickness of the color material layer is, for example, 0.1 μm or more and 3 μm or less.

For the coloring material layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto a first base material or the like by the above-mentioned coating means to form a coating film. It can be formed by drying it.
When the color material layer is a melt transfer type color material layer, the release layer may be provided between the first base material and the color material layer. Thereby, the transferability of the color material layer can be further improved.

[Thermal transfer image receiving sheet]
(Second base material)
As the second base material, a paper base material or the above resin film can be used.
Examples of the paper base material include high-quality paper, art paper, coated paper, resin-coated paper, cast-coated paper, paperboard, synthetic paper, and impregnated paper.

Further, a laminate made of two or more paper base materials, a laminate made of two or more resin films, or a laminate made of a paper base material and a resin film can be used as the second base material.

The thickness of the second base material is, for example, 30 μm or more and 300 μm or less.

(Glossy layer)
Examples of the glossy layer include the following first to fourth aspects.
The glossy layer of the first aspect is composed of a laminate including a resin film and a vapor-deposited film formed on one surface of the resin film.
Examples of the resin film include the above-mentioned resin film.

The vapor-deposited film can be formed of, for example, a metal such as aluminum, zinc, silicon, magnesium, calcium, potassium, tin, sodium, titanium, lead, indium or zirconium, or an oxide thereof.
The thickness of the thin-film deposition film is, for example, 1 nm or more and 150 nm or less.

The vapor-deposited film is, for example, a physical vapor deposition method such as a vacuum vapor deposition method, a sputtering method or an ion plating method, or a chemical vapor phase such as a plasma chemical vapor deposition method, a thermochemical vapor deposition method or a photochemical vapor deposition method. It can be formed by the growth method.
The glossy layer of the first aspect can be provided on the second base material via the following adhesive layer.

In the second aspect, the glossy layer comprises a metal pigment and a resin material.
Examples of the metal pigment include particles such as aluminum, nickel, chromium, brass, tin, brass, bronze, zinc, silver, platinum, gold and oxides thereof, and metal-deposited glass. The glossy layer may contain one or more metal pigments.

The content of the metal pigment in the glossy layer is preferably 20% by mass or more and 80% by mass or less, and more preferably 30% by mass or more and 75% by mass or less.

Examples of the resin material include polyolefins such as polyethylene, polyurethane, polyester, polyamide, vinyl resin, (meth) acrylic resin, epoxy resin, cellulose resin, styrene resin, polycarbonate and ionomer resin. The glossy layer may contain one or more resin materials.
The glossy layer may contain the above additives.

In the second aspect, the glossy layer is prepared by dispersing or dissolving the above-mentioned material in an appropriate solvent, and the coating liquid is applied onto the second base material by the above-mentioned coating means to apply the coating liquid. It can be formed by forming a film and drying it.

In a third aspect, the glossy layer comprises a pearl pigment and a resin material.
Examples of the pearl pigment include a scaly alumina pigment coated with a metal oxide and a mica pigment. Examples of the metal oxide include oxides such as titanium, iron, zirconium, silicon, aluminum and cerium. The glossy layer may contain one or more pearl pigments.

The content of the pearl pigment in the glossy layer is preferably 20% by mass or more and 80% by mass or less, and more preferably 30% by mass or more and 75% by mass or less.

Examples of the resin material include polyolefins such as polyurethane, polyester, polyamide and polyethylene, vinyl resins, (meth) acrylic resins, epoxy resins, cellulose resins, styrene resins, polycarbonates and ionomer resins. The glossy layer may contain one or more resin materials.
The glossy layer may contain the above additives.

In the third aspect, in the glossy layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto the second base material by the above-mentioned coating means to apply the coating liquid. It can be formed by forming a film and drying it.

In a fourth aspect, the glossy layer is made of metal foil. As the metal foil, for example, one made of a metal such as gold, silver, copper, aluminum and zinc can be appropriately selected and used.
The thickness of the metal foil is, for example, 5 μm or more and 50 μm or less.

As the metal foil, a metal foil produced by a conventionally known method or a commercially available metal foil can be used.
The metal foil can be provided on the second base material via the following adhesive layer.

(Receptive layer)
The receiving layer contains a resin material. Examples of the resin material include polyurethane, polyester, polyamide, polyethylene (PE), polyolefin, vinyl resin, (meth) acrylic resin, epoxy resin, imide resin, cellulose resin, styrene resin, polycarbonate, and ionomer resin. The receiving layer may contain one or two resin materials.

In one embodiment, the receiving layer comprises a mold release material. Examples of the release material include solid wax, surfactant, silicone oil and silicone resin. The receiving layer may contain one or two mold release materials.
Examples of waxes include polyethylene wax, polyamide wax, Teflon (registered trademark) powder and the like. Examples of the surfactant include a fluorine-based surfactant and a phosphoric acid ester-based surfactant. As the silicone oil, modified silicone oil is preferable. Examples of the modified silicone oil include amino-modified silicone, epoxy-modified silicone, aralkyl-modified silicone, epoxy-aralkyl-modified silicone, alcohol-modified silicone, vinyl-modified silicone and urethane-modified silicone.
The receiving layer may contain the above-mentioned additive.

The thickness of the receiving layer is, for example, 0.5 μm or more and 20 μm or less.

For the receiving layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto a glossy layer or the like by the above-mentioned coating means to form a coating film. Can be formed by drying.

(Primer layer)
In one embodiment, the thermal transfer image receiving sheet includes a primer layer between any layers, for example, between a glossy layer and a receiving layer or between a porous layer and a receiving layer. Thereby, the adhesion between these layers can be improved.

The primer layer contains a resin material.
The resin material is transparent and is not limited as long as the above-mentioned 20-degree mirror glossiness can be achieved, and examples thereof include polyester, polyurethane, polycarbonate, (meth) acrylic resin, styrene resin, vinyl resin, and cellulose resin. .. The primer layer may contain one or two resin materials.
The primer layer may contain the above-mentioned additive.

The thickness of the primer layer is, for example, 0.1 μm or more and 3.0 μm or less.

For the primer layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto an arbitrary layer by the above-mentioned coating means to form a coating film. It can be formed by drying.

(Porous layer)
In one embodiment, the thermal transfer image receiving sheet comprises a porous layer. In one embodiment, the porous layer is provided between the second substrate and the glossy layer. Thereby, the image density formed on the receiving layer and the transferability of the transfer layer on the receiving layer can be improved.

In one embodiment, the porous layer is composed of a porous film having fine voids inside.
Examples of the resin material constituting the porous film include polyolefins such as PE and PP, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer and vinyl resin such as ethylene-vinyl acetate copolymer, PET and PBT. Examples include polyester, styrene resin, and polyamide. Among the above, PP or PET is particularly preferable from the viewpoint of film smoothness, heat insulating property and cushioning property.
The porous film may contain the above additives.

The porous film can be produced by a known method. For example, it can be produced by forming a film by kneading incompatible organic particles or inorganic particles with the above-mentioned resin material. Further, in one embodiment, the porous film can be produced by forming a mixture containing a first resin material and a second resin material having a melting point higher than that of the first resin material into a film.
The porous film produced by the above method is not limited, and a commercially available porous film may be used.

The thickness of the porous film is, for example, 10 μm or more and 100 μm or less.

In one embodiment, the porous layer is a hollow particle-containing layer containing hollow particles and a binder material.
The hollow particles may be organic hollow particles made of a resin material or the like, or may be inorganic hollow particles made of glass or the like. Organic hollow particles are preferred because of their excellent dispersibility.
Examples of the resin material constituting the organic hollow particles include styrene resin, (meth) acrylic resin, phenol resin, fluororesin, polyamide, imide resin and polycarbonate.
The hollow particles may be foamed particles or non-foamed particles.

Examples of the binder material contained in the hollow particle-containing layer include polyurethane, polyester, cellulose resin, vinyl resin, (meth) acrylic resin, polyolefin, styrene resin, gelatin and its derivatives, styrene acrylic acid ester copolymer, and polyvinyl alcohol. , Polyethylene oxide, polyvinylpyrrolidone, purulan, dextran, dextrin, polyacrylic acid and its salts, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, casein, xantene gum, locust bean gum, alginic acid and arabic rubber. ..
The hollow particle-containing layer may contain the above-mentioned additives.

The thickness of the hollow particle-containing layer is, for example, 10 μm or more and 100 μm or less.

For the hollow particle-containing layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto an arbitrary layer by the above-mentioned coating means to form a coating film. It can be formed by drying this.

(Adhesive layer)
In one embodiment, the thermal transfer image receiving sheet includes an adhesive layer between any layers, for example, between the second substrate and the glossy layer. Thereby, the adhesion between these layers can be improved.

The adhesive layer contains a resin material. Examples of the resin material include vinyl resins such as polyvinyl acetate, polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer and vinyl chloride-vinyl acetate copolymer, polyolefins such as PE and PP, PET and PBT and the like. Examples thereof include (meth) acrylic resins such as polyester, polyamide, imide resin, polyacrylate, polymethacrylate and polymethylmethacrylate, cellulose resins such as cellulose diastase, polyol resins and polyurethanes.
When the adhesive layer contains a polyol resin, it preferably contains an isocyanate compound.
The adhesive layer may contain the above additives.

The thickness of the adhesive layer is, for example, 0.5 μm or more and 10 μm or less.

For the adhesive layer, the above-mentioned material is dispersed or dissolved in an appropriate solvent to prepare a coating liquid, and the coating liquid is applied onto an arbitrary layer by the above-mentioned coating means to form a coating film. It can be formed by drying. In one embodiment, the adhesive layer can be formed by melt extrusion of a resin composition containing the above materials.

An embodiment of a combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure is shown below. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure is not limited to these embodiments.

In the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of the present disclosure, the thermal transfer sheet comprises a first base material and a transfer layer.
The following equation (1-1) is satisfied.
(20-degree glossiness of thermal transfer image-receiving sheet)-(20-degree glossiness of thermal transfer image-receiving sheet after transfer of transfer layer) ≤200% (1-1)

In one embodiment, the combination of the heat transfer sheet and the heat transfer image receiving sheet of the present disclosure satisfies the following formula (2).
DOI ≧ 47.5 (2) of the thermal transfer image receiving sheet after transferring the transfer layer

In one embodiment, the transfer layer comprises a release layer containing a resin material and particles.
In one embodiment, the particles are talc.
In one embodiment, the average particle size of the particles is 0.7 μm or more and 8 μm or less.
In one embodiment, the specific surface area of the particles is 2 m ² / g or more and 20 m ² / g or less.
In one embodiment, the content of particles with respect to 100 parts by mass of the total amount of the resin material contained in the release layer is 1 part by mass or more and 13 parts by mass or less.
In one embodiment, the glass transition temperature of the resin material is 40 ° C. or higher and 115 ° C. or lower.
In one embodiment, the thickness of the release layer is 0.1 μm or more and 5 μm or less.

In one embodiment, the transfer layer comprises a heat seal layer on top of the release layer.
In one embodiment, the heat seal layer comprises a UV absorbing resin.
In one embodiment, the heat seal layer comprises at least one selected from silica, talc and polyethylene wax.

Next, the above combinations of the present disclosure will be described in more detail with reference to Examples, but the above combinations of the present disclosure are not limited to these Examples. Hereinafter, for materials for which the solid content is written, the blending amount before solid content conversion is shown.

Example 1
A coating liquid for a release layer having the following composition was applied to one surface of a PET film having a thickness of 4.5 μm and dried to form a release layer having a thickness of 1 μm. An intermediate layer coating liquid having the following composition was applied onto the release layer and dried to form an intermediate layer having a thickness of 0.5 μm. A coating liquid for a heat seal layer having the following composition was applied onto the intermediate layer and dried to form a heat seal layer having a thickness of 1 μm. In Example 1, the transfer layer is composed of a release layer, an intermediate layer and a heat seal layer. A coating liquid for a back layer having the following composition was applied to a surface of the PET film opposite to the surface on which the transfer layer was formed, and dried to form a back layer having a thickness of 0.8 μm. In this way, a thermal transfer sheet was obtained.

<Coating liquid for release layer>
(Meta) Acrylic resin A 100 parts by mass (manufactured by Mitsubishi Chemical Corporation, Dianal (registered trademark) BR-116,
Tg50 ℃, Mw45,000)
・ Talc A 3 parts by mass (manufactured by Nippon Talc Co., Ltd., Micro Ace (registered trademark) P-3,
Average particle size 5 μm, specific surface area 8 m ² / g)
-Methyl ethyl ketone (MEK) 306 parts by mass

<Coating liquid for intermediate layer>
30 parts by mass of alumina sol (manufactured by Nissan Chemical Industries, Ltd., alumina sol 200, average primary particle size 10 nm × 100 nm,
Solid content 10% by mass)
-Polyvinylpyrrolidone 3 parts by mass (manufactured by ISP, K-90)
・ 50 parts by mass of water ・ 17 parts by mass of isopropyl alcohol (IPA)

<Coating liquid for heat seal layer>
-UV absorbing resin 63 parts by mass (copolymer of a monomer having an ultraviolet absorbing skeleton and methyl methacrylate, composition molar ratio 3: 7, Tg 90 ° C, Mw 20,000 to 40,000, as a monomer having an ultraviolet absorbing skeleton , Made by Otsuka Chemical Co., Ltd., using UVA-93)
-Vinyl chloride-vinyl acetate copolymer 27 parts by mass (manufactured by Nissin Chemical Industry Co., Ltd., Solveine (registered trademark) CNL)
1 part by mass of silica C (manufactured by Fuji Silysia Chemical Ltd., Cylysia (registered trademark) 310P,
Average particle size 2.7 μm)
9 parts by mass of UV absorber (BASF Japan, Tinuvin (registered trademark) 928)
・ MEK 240 parts by mass ・ Normal propyl acetate 60 parts by mass

<Coating liquid for back layer>
-Polyvinyl butyral 2.0 parts by mass (Sekisui Chemical Co., Ltd., Eslek (registered trademark) BX-1)
-Polyisocyanate 9.2 parts by mass (manufactured by DIC Corporation, Burnock (registered trademark) D750)
-Phosphate ester-based surfactant 1.3 parts by mass (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., Prysurf (registered trademark) A208N)
-Talc 0.3 parts by mass (manufactured by Nippon Talc Co., Ltd., Micro Ace (registered trademark) P-3)
・ Toluene 43.6 parts by mass ・ MEK 43.6 parts by mass

Examples 2 to 10 and Comparative Examples 1 to 3
A thermal transfer sheet was produced in the same manner as in Example 1 except that the structure of each layer constituting the transfer layer was changed as shown in Table 1.
Examples 11-17
In the above-mentioned coating liquid for the heat-sealing layer for forming the heat-sealing layer, a heat transfer sheet was produced in the same manner as in Example 3 except that the types and amounts of particles were changed as shown in Table 2. While keeping the relative ratios of the ultraviolet-absorbing resin and the vinyl chloride-vinyl acetate copolymer the same as in Example 3, the total amount thereof was changed to change the ultraviolet-absorbing resin, the vinyl chloride-vinyl acetate copolymer, and the particles. The coating liquid was prepared so that the total amount of the ultraviolet absorber and the ultraviolet absorber was 100 parts by mass.
Details of each component in Tables 1 and 2 are as follows.
・ (Meta) acrylic resin B: Made by Mitsubishi Chemical Corporation,
Dianal (registered trademark) BR-113, Tg75 ° C, Mw30,000
・ (Meta) acrylic resin C: Made by Mitsubishi Chemical Corporation,
Dianal® BR-87, Tg105 ° C, Mw25,000
-Styrene resin: manufactured by Toyo Styrene Co., Ltd., G100C, Tg100 ° C.
・ Talc B: Made by Nippon Talc Co., Ltd., PG-15,
Average particle size 1.5 μm, specific surface area 18 m ² / g
-Polyethylene wax A: Made by Toyo Adre Co., Ltd., Polywax (registered trademark) 400
-Polyethylene wax B: Polywax (registered trademark) 600 manufactured by Toyo Adre Co., Ltd.
-Polyethylene wax C: Made by Toyo Adre Co., Ltd., Polywax (registered trademark) 1000
-Polyethylene wax D: Made by Toyo Adre Co., Ltd., Polywax (registered trademark) 3000
-Fluororesin particles: manufactured by Kitamura Co., Ltd., KTL-8N, average particle size 4 μm
-Silica A: manufactured by Fuji Silysia Chemical Ltd., Cylysia (registered trademark) 250N,
Average particle size 5.7 μm
-Silica B: manufactured by Fuji Silysia Chemical Ltd., Syricia (registered trademark) 380,
Average particle size 9 μm
-Silica C: manufactured by Fuji Silysia Chemical Ltd., Cylysia (registered trademark) 310P,
Average particle size 2.7 μm

<< Measurement of gloss difference >>
According to JIS Z 8741 (published in 1997), the 20-degree mirror glossiness of the receiving layer of the thermal transfer image receiving sheet prepared as follows was measured using the following spectrophotometer and found to be 1074%. rice field.
(Spectrophotometer)
・ Rhopoint IQ-S manufactured by Konica Minolta Co., Ltd.
・ Reflection angle: 20 degrees

The transfer layer provided by the thermal transfer sheets of Examples and Comparative Examples was transferred onto the receiving layer of the thermal transfer image receiving sheet using the following test printer.
(Test printer)
-Thermal head: Kyocera Corporation, KEE-57-12GAN2-STA
-Average resistance value of heating element: 3303Ω
-Main scanning direction resolution: 300 dpi (dot per inch)
-Secondary scanning direction resolution: 300 dpi
・ Printing voltage: 18V
-Line speed: 2.0 msec. / Line
-Printing start temperature: 35 ° C
-Pulse duty ratio: 85%
-Print image: Solid black image (0/255 image gradation)

The 20-degree mirror glossiness of the transfer layer transferred onto the receiving layer of the thermal transfer image receiving sheet was measured. Tables 1 and 2 show the measurement results and the difference from the 20-degree mirror glossiness of the thermal transfer image receiving sheet before the transfer layer transfer. In addition, the thermal transfer image sheet before and after the transfer layer transfer was visually observed and evaluated based on the following evaluation criteria. The evaluation results are shown in Tables 1 and 2.
In the central portion of the thermal transfer image receiving sheet (printed object), the 20-degree mirror glossiness was measured at three points perpendicular to the flow direction of the thermal transfer image receiving sheet (flow direction of the printing), and the average value was calculated. Described.

(Evaluation criteria)
A: The glossiness of the thermal transfer image receiving sheet before and after the transfer layer transfer was about the same.
B: Depending on the observation angle, the glossiness of the thermal transfer image sheet after transfer layer transfer was inferior to that of the thermal transfer image sheet before transfer layer transfer, but it was almost the same.
C: The glossiness of the thermal transfer image sheet after transfer layer transfer was inferior to that of the thermal transfer image sheet before transfer layer transfer, but there was no problem in practical use.
D: The glossiness of the thermal transfer image sheet after transfer layer transfer was significantly inferior to that of the thermal transfer image sheet before transfer layer transfer.

<Preparation of thermal transfer image receiving sheet>
Porous PP film A (manufactured by Mitsui Chemicals Tohcello Co., Ltd., SP-U, thickness 36 μm) and coated paper A (manufactured by Nippon Paper Industries Co., Ltd., Utrilo (registered trademark) 157, thickness 130 μm) A second substrate was prepared by laminating via a 2.5 μm adhesive layer.

An adhesive layer coating liquid having the following composition was applied to the surface of the porous PP film A in the second base material and dried to form an adhesive layer. On the adhesive layer, a 25 μm-thick PET film A (Metallite KY-27-CR, manufactured by Toyobo Co., Ltd.), which is provided with an aluminum vapor-deposited film having a thickness of 45 nm on one surface as a glossy layer, is deposited. Laminated from the formation surface side. The thickness of the adhesive layer at the time of drying was 2.4 μm.

A primer layer coating solution having the following composition was applied to the glossy layer surface and dried to form a primer layer having a thickness of 2.5 μm. A coating solution for a receiving layer having the following composition was applied onto the primer layer and dried to form a receiving layer having a thickness of 4 μm.
As described above, a thermal transfer image receiving sheet was obtained.
<Coating liquid for adhesive layer>
30 parts by mass of polyol resin (Mitsui Chemicals, Inc., Takelac (registered trademark) A-969V)
-Isocyanate compound 10 parts by mass (Mitsui Chemicals, Inc., Takenate (registered trademark) A-5)
・ Ethyl acetate 60 parts by mass

<Coating liquid for primer layer>
40 parts by mass of urethane resin (manufactured by Tosoh Corporation, Nipponporan (registered trademark) 5199 (solid content 30% by mass))
・ MEK 15 parts by mass

<Coating liquid for receiving layer>
60 parts by mass of vinyl chloride-vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., Solveine (registered trademark) C)
-Epoxy-modified silicone resin 1.2 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-3000T)
-Methylstyryl-modified silicone resin 0.6 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., X-24-510)
・ MEK 2.5 parts by mass ・ Toluene 2.5 parts by mass

<< Evaluation of Map Sharpness (DOI) >>
The DOI in the transfer layer transferred onto the receiving layer of the thermal transfer image receiving sheet was measured using the spectrophotometer and evaluated based on the following evaluation criteria. The results are shown in Tables 1 and 2.

(Evaluation criteria)
A: The DOI value was 60 or more.
B: The DOI value was 47.5 or more and less than 60.
C: The DOI value was less than 47.5.

<< Scratch resistance evaluation >>
The surface of the transfer layer transferred onto the receiving layer of the thermal transfer image receiving sheet was scraped using a Gakushin tester (manufactured by Suga Test Instruments Co., Ltd.) under the following conditions. The state of the surface of the transfer layer after scraping was visually observed and evaluated based on the following evaluation criteria. The results are shown in Tables 1 and 2.

(Evaluation criteria)
A: No scratches were found on the surface.
B: Some scratches were confirmed on the surface.
C: Many scratches were confirmed on the surface.
(Abrasion condition)
・ Friction material: Kanakin No. 3 ・ Load: 300g
・ Number of round trips: 10 round trips

The thermal transfer image sheet obtained in <Preparation of thermal transfer image sheet> was cut into a size of 5 mm × 30 mm. The work of sticking the double-sided tape on the cut thermal transfer image receiving sheet so as not to protrude from the sheet and sticking the cut thermal transfer image receiving sheet on the double-sided tape was repeated until the total thickness became 8 mm to obtain a laminated body. ..

The produced 5 mm × 30 mm × 8 mm laminate was fixed to one side of the ink ribbon flange receiving portion of a printer (DS-RX1HS, manufactured by Dai Nippon Printing Co., Ltd.) with double-sided tape. A protective layer panel of a genuine ink ribbon for DS-RX1HS was cut out, and a thermal transfer sheet of the example was cut and pasted on the protective layer panel to prepare a test ink ribbon. This test ink ribbon was set in the above printer. Under such conditions that wrinkles are likely to occur on the printed matter, a solid white image (255/255 image gradation; with transfer of the transfer layer) is printed on the receiving layer of the thermal transfer image receiving sheet to generate wrinkles on the printed matter. The presence or absence of was visually confirmed.

As a result, wrinkles of the printed matter were suppressed in Examples 1 to 9 in which the intermediate layer and the heat seal layer were provided, as compared with Example 10 in which the intermediate layer and the heat seal layer were not provided.
Compared with Example 11 in which particles were not added to the heat seal layer, in Examples 3 and 12 to 15 in which silica, talc or polyethylene wax was added, wrinkles in the printed matter were suppressed. Therefore, in Example 3, the occurrence of wrinkles on the printed matter was particularly suppressed.
In Examples 14 to 17 using the polyethylene wax, wrinkles in the printed matter were suppressed in Examples 14 to 15 in which the number average molecular weight of the polyethylene wax was small.

10: Thermal transfer sheet 11: First base material 12: Transfer layer 13: Release layer 14: Heat seal layer 15: Intermediate layer 16: Back layer 20: Thermal transfer image receiving sheet 21: Second base material 22: Glossy layer 23: Receptive layer

Claims (12)

It is a combination of a thermal transfer sheet and a thermal transfer image receiving sheet.
The thermal transfer sheet includes a first base material and a transfer layer.
A combination of a thermal transfer sheet and a thermal transfer image receiving sheet that satisfies the following formula (1-1).
(20-degree glossiness of the thermal transfer image-receiving sheet)-(20-degree glossiness of the thermal transfer image-receiving sheet after the transfer layer is transferred) ≤200% (1-1) The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 1, which satisfies the following formula (2).
DOI ≧ 47.5 (2) of the thermal transfer image receiving sheet after transferring the transfer layer. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 1 or 2, wherein the transfer layer includes a release layer containing a resin material and particles. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 3, wherein the particles are talc. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 3 or 4, wherein the average particle size of the particles is 0.7 μm or more and 8 μm or less. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to any one of claims 3 to 5, wherein the specific surface area of the particles is 2 m ² / g or more and 20 m ^{2 / g or less.} The thermal transfer sheet and thermal transfer according to any one of claims 3 to 6, wherein the content of the particles with respect to 100 parts by mass of the total amount of the resin material contained in the release layer is 1 part by mass or more and 13 parts by mass or less. Combination with image receiving sheet. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to any one of claims 3 to 7, wherein the glass transition temperature of the resin material is 40 ° C. or higher and 115 ° C. or lower. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to any one of claims 3 to 8, wherein the thickness of the release layer is 0.1 μm or more and 5 μm or less. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to any one of claims 3 to 9, wherein the transfer layer includes a heat seal layer on the release layer. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 10, wherein the heat seal layer contains an ultraviolet absorbing resin. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 10 or 11, wherein the heat seal layer contains at least one selected from silica, talc and polyethylene wax.

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