JP2021138095A - Thermal transfer sheet, and combination of thermal transfer sheet and thermal transfer image-receiving sheet - Google Patents

Abstract

To provide a thermal transfer sheet that is highly capable of holding a transfer layer and preventing the missing of print.SOLUTION: A thermal transfer sheet disclosed herein has a first base material and a transfer layer. The transfer layer has at least a peeling layer, which is a layer closest to first base material. The peeling layer has particles and resin materials. The particles have a volume-average particle size of 10 μm or more and 30 μm or less. The content of the particles in the peeling layer is 0.1 mass% or more and 1.5 mass% or less.SELECTED DRAWING: Figure 2

Description

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

Conventionally, energy is applied to a thermal transfer sheet provided with a base material and a transfer layer by using a thermal head or the like, and the transfer layer is transferred onto an object to be transferred such as a thermal transfer image receiving sheet to form an image or a protective layer. A thermal melt transfer method is known.
Such a thermal transfer sheet is required to have high transfer layer retention so that the transfer layer does not slip off during transportation in the printer.

By the way, there are various transferees having different materials, shapes and the like.
When the transfer layer is transferred onto a transfered body having a cut in the thickness direction such as a half cut or a perforation, as shown in FIG. 1 (b), a portion where the transferred body and the transfer layer do not contact (non-contact portion). ) Will exist.
Now, the present inventors, after the transfer layer of this non-contact portion is peeled off by a pinch roller or the like in the printer (see FIG. 1 (c)), slides off the pinch roller or reverse transfer from the pinch roller. As a result, we have found a new problem that when it adheres to the surface of the object to be transferred before image formation, it may cause omission of prints.

An object of the present disclosure is to provide a thermal transfer sheet having high transfer layer retention and print omission suppression.
Another object of the present disclosure is to provide a combination of the thermal transfer sheet and the thermal transfer image receiving sheet.

The heat transfer sheet of the present disclosure includes a first base material and a transfer layer, and comprises.
The transfer layer includes at least a release layer as a layer located closest to the first base material.
The release layer contains particles and resin material and contains
The volume average particle diameter of the particles is 10 μm or more and 30 μm or less.
The content of particles in the release layer is 0.1% by mass or more and 1.5% by mass or less.

According to the present disclosure, it is possible to provide a thermal transfer sheet having high transfer layer retention and print omission suppression property.
Further, according to the present disclosure, it is possible to provide a combination of the thermal transfer sheet and the thermal transfer image receiving sheet.

It is a schematic cross-sectional view for explaining a problem. It is a schematic cross-sectional view which shows one Embodiment of the thermal transfer sheet of this disclosure. It is a schematic cross-sectional view which shows one Embodiment of the thermal transfer sheet of this disclosure. It is a schematic cross-sectional view which shows one Embodiment of the thermal transfer sheet of this disclosure. It is a schematic cross-sectional view which shows one Embodiment of the thermal transfer sheet of this disclosure. It is schematic cross-sectional view which shows one Embodiment of the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of this disclosure. It is a front view which shows one Embodiment of the heat transfer image receiving sheet which constitutes the combination of the heat transfer sheet and the heat transfer image receiving sheet of this disclosure, and is the schematic cross-sectional view in line A1-A1 of the front view. It is a front view which shows one Embodiment of the thermal transfer image receiving sheet which constitutes the combination of the thermal transfer sheet and the thermal transfer image receiving sheet of this disclosure, and is the schematic cross-sectional view of A2-A2 line and A3-A3 line of the front view.

(Thermal transfer sheet)
As shown in FIG. 2, the heat transfer sheet 10 of the present disclosure includes a first base material 11 and a transfer layer 13, and the transfer layer 13 includes at least a release layer 12.
In one embodiment, the transfer layer 13 includes a protective layer 14 on the release layer 12, as shown in FIG.
In one embodiment, the transfer layer 13 includes an adhesive layer 15 on the outermost surface, as shown in FIG.
In one embodiment, the transfer layer 13 comprises a receptive layer on the release layer 12 (not shown).
In one embodiment, as shown in FIG. 5, the thermal transfer sheet 10 includes a color material layer 16 so as to be surface-sequential with the transfer layer 13. The thermal transfer sheet 10 may include a plurality of color material layers 16.
In one embodiment, the thermal transfer sheet 10 includes a primer layer between the first base material 11 and the color material layer 16 (not shown).
In one embodiment, as shown in FIGS. 2-5, the thermal transfer sheet 10 includes a back layer 17 on the surface of the first substrate 11 opposite to the surface on which the transfer layer 13 is provided.
Hereinafter, each layer included in the thermal transfer sheet according to the present disclosure will be described.

(1st base material)
The base material can be used without limitation as long as it has heat resistance to the heat energy applied during thermal transfer, and has mechanical strength and solvent resistance that can support the transfer layer and the like provided on the base material.

As the first base material, a film composed 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 polyamide such as nylon 6,6, polyolefin such as polyethylene (PE), polypropylene (PP) and polymethylpentene, polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-acetic acid. Vinyl copolymers, vinyl resins such as polyvinyl butyral and polyvinylpyrrolidone (PVP), (meth) acrylic resins such as polyacrylate and polymethacrylate, imide resins such as polyimide and polyetherimide, cellophane, cellulose acetate, nitrocellulose, cellulose Examples thereof include cellulose resins such as acetate propionate (CAP) 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 of the present disclosure includes a transfer layer, and 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 protective layer on top of the release layer.
In one embodiment, the transfer layer comprises an adhesive layer on the outermost surface.
In one embodiment, the transfer layer comprises a receptive layer on top of the release layer.

(Release layer)
The release layer contains a resin material and particles.
Examples of the resin material include polyester, polyamide, polyethylene (PE), polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin and the like.
Among these, (meth) acrylic resin, vinyl resin or styrene resin is preferable, and (meth) acrylic resin or vinyl resin is more preferable, from the viewpoint of suppressing print omission and glossiness of the transfer layer.
Among the (meth) acrylic resins, (meth) acrylic acid ester is preferable, and polymethylmethacrylate (PMMA), polyethylmethacrylate or propylpolymethacrylate is more preferable.
Among the vinyl resins, a vinyl chloride-vinyl acetate copolymer is preferable.
The release layer may contain two or more types of resin materials.

The content of the resin material in the release layer is preferably 50% by mass or more and 95% by mass or less, and more preferably 70% by mass or more and 95% by mass or less. This makes it possible to further improve the print removal inhibitory property and the glossiness of the transfer layer.

The volume average particle diameter of the particles is 10 μm or more and 30 μm or less, preferably 12 μm or more and 29 μm or less, and particularly preferably 15 μm or more and 28 μm or less. Thereby, the transfer layer retention property and the print omission suppression property can be improved.
In the present disclosure, the volume average particle size of particles is measured according to JIS Z 8825: 2013.

The content of particles in the release layer is 0.1% by mass or more and 1.5% by mass or less, preferably 0.3% by mass or more and 1.2% by mass or less, and 0.4% by mass or more and 0.8% by mass or less. The following are particularly preferred. Thereby, the transfer layer retention property and the print omission suppression property can be improved.

The shape of the particles is spherical, elliptical, cylindrical, prismatic or amorphous.
Further, the particles may be hollow particles.

In one embodiment, the particles are made of a resin material. For example, fluororesins, silicones, polyesters, polyamides, polyethylene (PE), polyolefins, vinyl resins, (meth) acrylic resins, imide resins, cellulose resins, styrene resins, polycarbonates, ionomer resins and the like can be mentioned.
Among these, a fluororesin is preferable from the viewpoint of transfer layer retention and print omission suppression.
In the present disclosure, the fluororesin refers to a resin composed of a main chain composed of a carbon chain and a side chain having a fluorine atom.
Examples of the fluororesin include polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), perfluoroethylenepropylene (FEP), ethylenetetrafluoroethylene (ETFE), polychlorotrifluoroethylene (PCTFE), and ethylenechloro. Examples thereof include trifluoroethylene (ECTFE), polyvinylidene fluoride (PVDF) and polyvinylidene fluoride (PVF).
Among these, PTFE is particularly preferable from the viewpoint of transfer layer retention and print omission suppression.

The wetting tension of the particles is preferably 15 mN / m or more and 28 mN / m or less, and more preferably 16 mN / m or more and 25 mN / m or less. Thereby, the print omission suppression property can be further improved.
In the present disclosure, the wetting tension of the particles is measured in accordance with JIS K 6768: 1999 by compression molding the particles into pellets.

The release layer may contain additives. For example, fillers, plastics, antistatic materials, ultraviolet absorbers, inorganic particles, mold release materials, dispersants and the like can be mentioned.

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 3 μm or less, and particularly preferably 0.5 μm or more and 2.5 μm or less. Thereby, the transfer layer retention property and the print omission suppression property can be further improved.
In the present disclosure, the thickness of the release layer refers to the thickness of the release layer in a place where particles do not exist.

In the release layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto a first substrate or the like for coating. It can be formed by forming a film and drying it. As the coating means, 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.

(Protective layer)
In one embodiment, the protective layer comprises a resin material. For example, (meth) acrylic resin, polyester, cellulose resin, polystyrene, polyamide, polyvinyl acetal, polycarbonate, thermosetting resin, active photocurable resin and the like can be mentioned.

The protective layer may contain the above additives.

The thickness of the protective layer is, for example, 0.1 μm or more and 50 μm or less.

In the protective layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto a release layer or the like by the above-mentioned coating means. To form a coating film, which can be dried.

(Adhesive layer)
The adhesive layer contains at least one type of thermoplastic resin that is softened by heating and exhibits adhesiveness.
Examples of the thermoplastic resin include polyester, vinyl resin, (meth) acrylic resin, (meth) acrylic resin, polyurethane, cellulose resin, polyamide, polyolefin, polystyrene, and chlorinated resins thereof.

The adhesive layer may contain the above additives.

The thickness of the adhesive layer is, for example, 0.1 μm or more and 2 μm or less.

In the adhesive layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto a release layer or the like by the above-mentioned coating means. To form a coating film, which can be dried.

The ratio of the volume average particle diameter of the particles to the thickness of the transfer layer (volume average particle diameter of the particles / thickness of the transfer layer) is preferably 1 or more and 60 or less, and more preferably 2 or more and 20 or less. Thereby, the transfer layer retention property and the print omission suppression property can be further improved.

(Receptive layer)
The receiving layer is a layer that receives the sublimating dye transferred from the dye layer of the sublimation thermal transfer sheet and maintains the formed image.

The receiving layer contains a resin material. For example, polyester, polyamide, polyethylene (PE), polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin and the like can be mentioned.

In one embodiment, the receiving layer comprises a mold release material. For example, solid wax, surfactant, silicone oil, silicone resin and the like can be mentioned.
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, urethane-modified silicone and the like.

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.

In the receiving layer, the above-mentioned material is dispersed in water or an appropriate solvent, or the above-mentioned material is dissolved in water or an appropriate solvent to prepare a coating liquid, and the coating solution is applied onto a release layer or the like by the above-mentioned coating means. To form a coating film, which can be dried.

(Color material layer)
The color material layer contains at least one color material, which may be a pigment or a dye. Moreover, 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. Examples include dyes.

In one embodiment, the colorant layer comprises a resin material. For example, polyester, polyamide, polyolefin, vinyl resin, vinyl acetal resin, (meth) acrylic resin, cellulose resin, styrene resin, polycarbonate, phenoxy resin, ionomer resin and the like can be mentioned.

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

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

In the coloring material layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, and the first base material or the like is prepared by the above-mentioned coating means. It can be formed by applying it on top to form a coating film and 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.

(Back layer)
In one embodiment, the heat transfer sheet of the present disclosure includes a back layer on a surface of the first substrate on which 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. For example, cellulose resin, styrene resin, vinyl resin, polyester, polyurethane, silicone-modified polyurethane, fluorine-modified polyurethane, (meth) acrylic resin and the like can be mentioned.

In one embodiment, the back layer contains, as a resin material, a two-component curable resin that is cured by being used in combination with an isocyanate compound or the like. 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 2 μm or less, and more preferably 0.1 μm or more and 1 μm or less. As a result, sticking, wrinkles, and the like can be suppressed while maintaining the transmissibility of thermal energy during thermal transfer.

In the back layer, the material is dispersed in water or a suitable solvent, or the material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto the first substrate by the coating means. To form a coating film, which can be dried.

(Primer layer)
In one embodiment, the heat transfer sheet of the present disclosure includes a primer layer between the first base material and the color material layer. Thereby, the adhesion between the first base material and the adjacent layer can be improved.

In one embodiment, the primer layer contains a resin material, and examples thereof include polyester, vinyl resin, polyurethane, (meth) acrylic resin, polyamide, ether resin, and cellulose resin.

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

In the primer layer, the above-mentioned material is dispersed in water or a suitable solvent, or the above-mentioned material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto the first substrate by the above-mentioned coating means. To form a coating film, which can be dried.

(Combination of thermal transfer sheet and thermal transfer image receiving sheet)
As shown in FIG. 6, the combination of the thermal transfer sheet 10 and the thermal transfer image receiving sheet 20 of the present disclosure is as shown in FIG.
The thermal transfer sheet 10 and
A thermal transfer image receiving sheet 20 comprising a second base material 21 and a receiving layer 22 and having a notch 23 in the thickness direction.
It is characterized by having.

In one embodiment, the thermal transfer image receiving sheet 20 includes an adhesive layer 24 between the second base material 21 and the receiving layer 22, as shown in FIG.

In one embodiment, the notch 23 of the thermal transfer image receiving sheet 20 is a half cut that does not penetrate in the thickness direction, as shown in FIGS. 6 and 7.
The cut width L1 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 70 μm or less. Thereby, the print omission suppression property can be further improved.
The cutting depth is, for example, 50 μm or more and 150 μm or less.

In one embodiment, the notch 23 of the thermal transfer image receiving sheet 20 penetrates in the thickness direction as shown in FIG. 8 and forms a perforation for cutting.
The cut width L1 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 70 μm or less. Thereby, the print omission suppression property can be further improved.
The notch length L2 is preferably 0.1 mm or more and 0.8 mm or less, and more preferably 0.2 mm or more and 0.9 mm or less. Thereby, the print omission suppression property can be further improved.

Hereinafter, each layer included in the thermal transfer image receiving sheet will be described. Since the thermal transfer sheet has been described above, the description thereof is omitted here.

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, impregnated paper and the like.

Further, a laminated body made of two or more of the above paper base materials, a laminated body made of two or more resin films, or a laminated body 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.

(Receptive layer)
The structure of the receiving layer can be the same as that of the receiving layer that the thermal transfer sheet can have.
In a preferred embodiment, the receiving layer comprises a polyester or vinyl resin as the resin material. Thereby, the adhesion with the transfer layer can be improved.

(Adhesive layer)
In one embodiment, the thermal transfer image receiving sheet includes an adhesive layer between the second substrate and the receiving layer. As a result, a sticker-type printed matter can be manufactured using the heat transfer image receiving sheet.

The adhesive layer contains at least one resin material. For example, polyester, polyamide, polyolefin, vinyl resin, (meth) acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate, ionomer resin and the like can be mentioned.
Among these, as described above, when the unformed portion of the release layer is provided on the surface base material, polyester and (meth) acrylic resin are preferable from the viewpoint of adhesiveness to the surface base material.

The content of the resin material in the adhesive layer is, for example, 50% by mass or more and 90% by mass or less.

The adhesive layer may contain a curing material. For example, isocyanate compounds, carbodiimide compounds, epoxy compounds, oxazoline compounds and the like can be mentioned.
Among the above-mentioned cured materials, isocyanate compounds are preferable, and examples thereof include xylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), isophorone diisocyanate (IPDI), and diphenylmethane diisocyanate (MDI).
The adhesive layer may contain two or more types of curing materials.

The content of the curing material in the adhesive layer is, for example, 1% by mass or more and 10% by mass or less.

In one embodiment, the adhesive layer may contain the above additives.

The thickness of the adhesive layer is, for example, 6 μm or more and 12 μm or less.

In the adhesive layer, the material is dispersed in water or a suitable solvent, or the material is dissolved in water or a suitable solvent to prepare a coating liquid, which is applied onto the second substrate by the coating means. To form a coating film, which can be dried.

The present disclosure will be described in more detail with reference to the following examples, but the present disclosure is not limited to these examples.

Example 1
Coating liquids A to C for coloring material layers having the following compositions are sequentially applied to one surface of a 4.5 μm-thick PET film and dried to obtain 0.7 μm-thick color material layers A to C, respectively. Formed.
<Coating liquid A for color material layer>
・ Yellow sublimation dye 6 parts by mass ・ Polyvinyl acetal 4 parts by mass (Sekisui Chemical Co., Ltd., Eslek (registered trademark) KS-6)
-Methyl ethyl ketone (MEK) 45 parts by mass-Toluene 45 parts by mass <Coating liquid B for color material layer>
・ Magenta sublimation dye 6 parts by mass ・ Polyvinyl acetal 4 parts by mass (Sekisui Chemical Co., Ltd., Eslek (registered trademark) KS-6)
・ MEK 45 parts by mass ・ Toluene 45 parts by mass <Coating liquid C for color material layer>
・ Cyan sublimation dye 6 parts by mass ・ Polyvinyl acetal 4 parts by mass (Sekisui Chemical Co., Ltd., Eslek (registered trademark) KS-6)
・ MEK 45 parts by mass ・ Toluene 45 parts by mass

A coating liquid for a release layer having the following composition was applied onto the PET film so as to be surface-sequential with the color material layer, and dried to form a release layer having a thickness of 1.5 μm.
<Coating liquid for release layer>
15 parts by mass of polymethyl methacrylate (PMMA) (manufactured by Mitsubishi Chemical Corporation, Dianal (registered trademark) BR-87)
-Particle A 0.075 parts by mass (manufactured by Daikin Industries, Ltd., Polyflon (registered trademark) PTFEM-111, polytetrafluoroethylene (PTFE), volume average particle diameter 25 μm, wetting tension 18 mN / m)
・ 20 parts by mass of toluene ・ 65 parts by mass of MEK

A coating liquid for a protective layer having the following composition was applied onto the release layer and dried to form a protective layer having a thickness of 2 μm. In Example 1, the transfer layer is composed of the release layer and the protective layer.
<Coating liquid for protective layer>
20 parts by mass of polyester (manufactured by Toyobo Co., Ltd., Byron (registered trademark) 200)
・ 10 parts by mass of UV absorber (UVA-635L, manufactured by BASF Japan Ltd.)
・ MEK 70 parts by mass

A coating liquid for a back layer having the following composition was applied to the other surface of the PET film and dried to form a back layer having a thickness of 0.8 μm to obtain a thermal transfer sheet.
<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 Industry Co., Ltd., Micro Ace (registered trademark) P-3)
・ Toluene 43.6 parts by mass ・ MEK 43.6 parts by mass

Examples 2-12 and Comparative Examples 1-9
A thermal transfer sheet was produced in the same manner as in Example 1 except that the composition and thickness of the release layer and at least one or more of the thickness of the protective layer were changed as shown in Table 1.
The details of each component in Table 1 are as follows.
-Vinyl chloride-vinyl acetate copolymer: manufactured by Nisshin Kagaku Kogyo Co., Ltd., solveine (registered trademark) AL, described as PVC in the table.-Styrene resin: manufactured by DIC Corporation, Dick styrene (registered trademark) ) CR-3500
-Particle B: AGC Co., Ltd., Fluon (registered trademark) L150J, PTFE, volume average particle diameter 10 μm, wetting tension 18 mN / m
-Particle C: Shin-Etsu Chemical Co., Ltd., KMP-601, silicone powder, volume average particle diameter 12 μm, wetting tension 21 mN / m
-Particle D: Shin-Etsu Chemical Co., Ltd., KMP-602, silicone powder, volume average particle diameter 30 μm, wetting tension 21 mN / m
-Particle E: 3M Japan Ltd., Dynion (registered trademark) TF9205, PTFE, volume average particle diameter 8 μm, wetting tension 18 mN / m
-Particle F: 3M Japan Ltd., Dynion (registered trademark) TF9202Z, PTFE, volume average particle diameter 4 μm, wetting tension 18 mN / m
-Particle G: Daikin Industries, Ltd., Polyflon (registered trademark) PTFE-12, PTFE, volume average particle diameter 50 μm, wetting tension 18 mN / m

<< Evaluation of print omission suppression-1 >>
The thermal transfer sheet obtained in Examples and Comparative Examples, a transfer material having a cut width of 50 μm and a half cut, and the following test printer were prepared.
A sublimation dye was transferred from the color material layer included in the thermal transfer sheet onto the transferee to form an image, and then the protective layer was transferred to produce a printed matter. In the same manner, 10 prints were produced in succession. Ten prints were visually observed to check the number of missing prints having a size of 0.1 mm or more. Evaluation is based on the following evaluation criteria and is shown in Table 1.
The manufacturing conditions for the printed matter were as follows.
(Evaluation criteria)
A: The number of missing prints was one or less.
B: The number of missing prints was 2 or more and 4 or less.
C: The number of missing prints was 5 or more and 7 or less.
NG: The number of missing prints was 8 or more.
(Manufacturing conditions for printed materials)
-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
-Line speed: 3.0 msec. / Line
-Printing start temperature: 35 ° C
-Pulse duty ratio: 70%
-Print image: Gray solid image (128/255 image gradation)

<< Evaluation of print omission suppression-2 >>
A printed matter was produced and evaluated in the same manner as in the print omission inhibitory evaluation-1 except that the transferred body was changed to a perforated transferred body having a cut width of 60 μm and a cut length of 0.4 mm. The evaluation results are shown in Table 1.

<< Evaluation of transfer layer retention >>
The thermal transfer sheets obtained in Examples and Comparative Examples were cut into a size of 100 mm in width × 100 mm in length to prepare test pieces.
This test piece was folded once in the width direction and once in the length direction with the transfer layer side inside, and allowed to stand for 10 minutes.
After standing, the test piece was spread out, visually observed, and evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1.
(Evaluation criteria)
A: No ^{foil drop of 0.5 mm 2} or more occurred.
B: 0.5 mm ² or more and less than 1 mm ² foil drop occurred.
NG: There was a foil drop of ^{1 mm 2 or more.}

<< Gloss evaluation >>
The glossiness of the printed matter obtained in the above-mentioned evaluation of the print loss inhibitory property was measured using the following gloss meter in accordance with JIS Z 8741 (published in 1997). The measurement results are shown in Table 1.
(Gloss meter)
-Gloss Meter VG7000 manufactured by Nippon Denshoku Industries Co., Ltd.
・ Reflection angle: 20 °

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

The heat transfer sheet of the present disclosure includes a base material and a transfer layer.
The transfer layer includes at least a release layer as a layer located closest to the base material.
The release layer contains particles and resin material and contains
The volume average particle diameter of the particles is 10 μm or more and 30 μm or less.
The content of particles in the release layer is 0.1% by mass or more and 1.5% by mass or less.

In one embodiment, the particles are made of fluororesin.

In one embodiment, the ratio of the volume average particle size of the particles to the thickness of the transfer layer (volume average particle size of the particles / thickness of the release layer) is 2 or more and 20 or less.

In one embodiment, the thickness of the release layer is 0.1 μm or more and 5 μm or less.

In one embodiment, the resin material is at least one resin material selected from (meth) acrylic resin, vinyl resin and styrene resin.

The combination of the heat transfer sheet and the heat transfer image receiving sheet of the present disclosure includes the above heat transfer sheet, a second base material, a receiving layer, and a heat transfer image receiving sheet having a notch in the thickness direction.

In one embodiment, the notch width of the notch is 10 μm or more and 100 μm or less.

In one embodiment, the thermal transfer image receiving sheet comprises an adhesive layer between the second substrate and the receiving layer.

10: Thermal transfer sheet, 11: First substrate, 12: Release layer, 13: Transfer layer, 14: Protective layer, 15: Adhesive layer, 16: Color material layer, 17: Back layer, 20: Thermal transfer image receiving sheet, 21 : Second base material, 22: Receptive layer, 23: Adhesive layer

Claims (8)

A first base material and a transfer layer are provided,
The transfer layer includes at least a release layer as a layer located closest to the first base material.
The release layer contains particles and a resin material and contains
The volume average particle diameter of the particles is 10 μm or more and 30 μm or less.
A thermal transfer sheet in which the content of the particles in the release layer is 0.1% by mass or more and 1.5% by mass or less. The thermal transfer sheet according to claim 1, wherein the particles are made of a fluororesin. The thermal transfer sheet according to claim 1 or 2, wherein the ratio of the volume average particle diameter of the particles to the thickness of the transfer layer (volume average particle diameter of particles / thickness of the transfer layer) is 2 or more and 20 or less. The thermal transfer sheet according to any one of claims 1 to 3, wherein the thickness of the release layer is 0.1 μm or more and 5 μm or less. The thermal transfer sheet according to any one of claims 1 to 4, wherein the resin material is at least one resin material selected from (meth) acrylic resin, vinyl resin, and styrene resin. The thermal transfer sheet according to any one of claims 1 to 5,
A thermal transfer image receiving sheet provided with a second base material and a receiving layer and having a notch in the thickness direction.
A combination of a thermal transfer sheet and a thermal transfer image receiving sheet. The combination of the thermal transfer sheet and the thermal transfer image receiving sheet according to claim 6, wherein the notch width of the notch is 10 μm or more and 100 μm or less. The combination of the thermal transfer sheet and the thermal transfer image sheet according to claim 6, wherein the thermal transfer image receiving sheet includes an adhesive layer between the second base material and the receiving layer.

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