JP7230402B2 - thermal transfer image receiving sheet - Google Patents

Description

The present invention relates to a thermal transfer image receiving sheet.

Conventionally, various printing methods are known, but among them, the sublimation thermal transfer method can freely adjust the density gradation, has excellent reproducibility of intermediate colors and gradation, and produces high quality comparable to that of silver salt photography. Image formation is possible.

In this sublimation-type thermal transfer method, a thermal transfer sheet having a dye layer containing a sublimation dye and a thermal transfer image-receiving sheet having a receiving layer are superimposed, and then the thermal transfer sheet is heated by a thermal head provided in a thermal transfer printer. , the sublimable dye in the dye layer is transferred to the receiving layer of the thermal transfer image receiving sheet, and an image is formed to obtain a print.

Thermal transfer printers used for producing prints generally have a pair of transport rollers, such as a pinch roller and a cap, for transporting the thermal transfer image receiving sheet to an image forming position downstream in the transport direction of the thermal transfer image receiving sheet. Equipped with a stun roller.
The pinch roller contacts the receiving layer of the thermal transfer image-receiving sheet, and the capstan roller contacts the back surface of the thermal transfer image-receiving sheet (opposite to the receiving layer side with the substrate as the center).

Normally, the capstan roller has spikes, which are fine projections, on its surface, and the spikes dig into the back surface of the thermal transfer image-receiving sheet to hold the thermal transfer image-receiving sheet and prevent misalignment during image formation. there is

In recent years, in some applications such as card games, images are formed on the back side of printed matter in order to improve design. Less and more discreet is required.

For example, Patent Document 1 proposes a thermal transfer image-receiving sheet provided with a resin layer having a softening point of 110° C. or higher on the back surface, thereby reducing the occurrence of spike marks.

JP-A-11-115328

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to effectively prevent the occurrence of spike marks on the back side of a print and to make the formed spike marks inconspicuous. To provide a thermal transfer image-receiving sheet capable of producing a printed matter with high design property.

The thermal transfer image-receiving sheet of the present invention comprises a release portion, and a body portion comprising a release layer, a substrate and a receiving layer, wherein the release layer contains a silicone resin and a silicone filler, and the release portion has a thickness of 20 μm. It is characterized by being more than 100 μm and less than 100 μm.

In one embodiment, the glossiness of the release portion side surface of the release layer is 5% or more and 60% or less.

In one embodiment, the silicone filler has an average particle size of 1.5 μm or more and 5 μm or less.

In one embodiment, the release layer has a thickness of 1 μm or more and 2 μm or less.

In one embodiment, the ratio of the average particle size of the silicone filler to the thickness of the release layer (average particle size of the silicone filler/thickness of the release layer) is 1 or more and 4.5 or less.

In one embodiment, the release part comprises a release base material and an adhesive layer.

In one embodiment, the body portion comprises an adhesive layer and a porous layer between the substrate and the receiving layer.

In one embodiment, the body portion comprises a primer layer between the substrate or porous layer and the receiving layer.

According to the present invention, it is possible to effectively prevent the occurrence of spike marks on the back surface of a print, and to make the formed spike marks inconspicuous, thereby making it possible to produce a highly designed print. A thermal transfer image-receiving sheet can be provided.

1 is a schematic cross-sectional view of a thermal transfer image-receiving sheet in one embodiment; FIG. 1 is a schematic cross-sectional view of a thermal transfer image-receiving sheet in one embodiment; FIG. 1 is a schematic cross-sectional view of a thermal transfer image-receiving sheet in one embodiment; FIG. 1 is a schematic cross-sectional view of a thermal transfer image-receiving sheet in one embodiment; FIG.

(Thermal transfer image receiving sheet)
The thermal transfer image-receiving sheet 10 of the present invention, as shown in FIG.
Moreover, in one embodiment, the peeling part 11 includes a peeling base material 16 and an adhesive layer 17, as shown in FIG.
In one embodiment, the main body portion 16 of the thermal transfer image receiving sheet 10 of the present invention includes an adhesive layer 18 and a porous layer 19 between the substrate 14 and the receiving layer 15, as shown in FIG. .
In one embodiment, the main body 16 of the thermal transfer image-receiving sheet 10 of the present invention has a primer layer 20 between the substrate 14 or the porous layer 19 and the receiving layer 15, as shown in FIG. Prepare.
Each layer included in the thermal transfer image-receiving sheet of the present invention will be described below.

(Peeling part)
The peeling portion is a layer that is peeled off after image formation on the receiving layer, and is provided to prevent the occurrence of spike marks on the back surface of the printed matter. In one embodiment, the release portion comprises a release substrate. Moreover, in one embodiment, the release part includes an adhesive layer as a layer on the release base material and in contact with the release layer.

The thickness of the peeled portion is 20 μm or more and 100 μm or less, preferably 25 μm or more and 70 μm or less. As a result, the occurrence of spike marks on the back surface of the print can be more significantly prevented. The thermal transfer image-receiving sheet is cut to a desired size by a cutter mechanism provided in the thermal transfer printer after the image is formed on the receiving layer in the printer. As a result, the load on the cutter mechanism can be reduced, and when a large number of prints are produced, it is possible to prevent fuzz from occurring on the end faces of the prints and impairing their appearance (hereinafter referred to as ease of cutting). .

(Release base material)
Examples of release substrates include paper substrates such as woodfree paper, art paper, coated paper, resin-coated paper, cast-coated paper, cardboard, synthetic paper and impregnated paper, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene. Polyester such as naphthalate (PEN), 1,4-polycyclohexylene dimethylene terephthalate, terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer, polyamide such as nylon 6 and nylon 6,6, polypropylene (PP), high Density polyethylene (HDPE, density 0.941g/cm3 ^or more), medium density polyethylene (MDPE, density 0.925g/cm3 ^or more and less than 0.941g/ ^cm3 ), low density polyethylene (LDPE, density 0.925g/cm3) ³ ), linear low density polyethylene (LLDPE, density less than 0.925 g/cm ³ ), and polyolefins such as polymethylpentene, polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-vinyl acetate Copolymers, vinyl resins such as polyvinyl butyral and polyvinylpyrrolidone (PVP), (meth)acrylic resins such as polyacrylate, polymethacrylate and polymethyl methacrylate, imide resins such as polyimide and polyetherimide, cellophane, cellulose acetate , cellulose resins such as nitrocellulose, cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB), styrene resins, polycarbonates, and resin materials such as ionomer resins.
Among the above, from the viewpoint of preventing the occurrence of spike marks, a resin film is preferable, a resin film composed of polyester or polyolefin is more preferable, and a resin film composed of PET or PP is even more preferable.
In the present invention, "(meth)acryl" includes both "acryl" and "methacryl". In addition, "(meth)acrylate" includes both "acrylate" and "methacrylate".

The release substrate may be subjected to surface treatment such as corona treatment and ozone treatment.

The thickness of the release base material is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 70 μm or less. As a result, it is possible to more significantly prevent the occurrence of spike marks on the back surface of the printed matter and improve the ease of cutting.

The density of the release substrate is preferably 0.6 g/cm ³ or more and 1.5 g/cm ³ or less, more preferably 0.9 g/cm ³ or more and 1.4 g/cm ³ or less. As a result, the occurrence of spike marks can be more significantly prevented.
In addition, in the present invention, the density of the release substrate is measured according to JIS K 7112.

The release base material may be formed by laminating the resin film with a release layer provided in the main body via an adhesive layer described below, and the above resin material is melt-extruded onto the base material. It may be formed by

(adhesive layer)
In one embodiment, the release part includes an adhesive layer as a layer on the release base material and in contact with the release layer, whereby the body part and the release part can be appropriately adhered. The adhesive layer contains at least one resin material, examples of which include polyesters, polyamides, polyolefins, vinyl resins, (meth)acrylic resins, imide resins, cellulose resins, styrene resins, polycarbonates and ionomer resins.

The content of the resin material in the adhesive layer is not particularly limited, but can be 50% by mass or more and 90% by mass or less.

The adhesive layer can contain a curing material, and examples thereof include isocyanate compounds, carbodiimide compounds, epoxy compounds and oxazoline compounds.
Among the above curing agents, isocyanate compounds are preferred, and examples include xylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), isophorone diisocyanate (IPDI) and diphenylmethane diisocyanate (MDI).
Among the above isocyanate compounds, XDI and HDI are preferred from the viewpoint of preventing yellowing of the first receiving layer.
The adhesive layer may contain two or more curing materials.

The content of the curing agent in the adhesive layer is not particularly limited, but can be 1% by mass or more and 10% by mass or less.

In one embodiment, the adhesive layer can contain the above additives as long as the properties of the present invention are not impaired.

The thickness of the adhesive layer is not particularly limited, but can be, for example, 6 μm or more and 12 μm or less.

The adhesive layer is formed by dispersing or dissolving the above material in water or an appropriate solvent to form a coating liquid, which is applied by a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method and a It can be formed by coating a release base material or a release layer described later to form a coating film by a known means such as a rod coating method, and drying the film.

(main body)
The body portion includes at least a release layer, a substrate and a receiving layer. Also, in one embodiment, the body further comprises an adhesive layer and a porous layer between the substrate and the receiving layer. Also, in one embodiment, the body further comprises a primer layer between the substrate or porous layer and the receiving layer.

(release layer)
The release layer contains a silicone resin, preferably a curable silicone resin.
As a curable silicone resin,
(1) "addition reaction type silicone resin" obtained by heating and curing an organohydrogenpolysiloxane and an alkenyl group-containing organopolysiloxane in the presence of a platinum catalyst;
(2) A "condensation reaction type silicone resin" obtained by heating and curing an organohydrogenpolysiloxane and an organopolysiloxane containing terminal hydroxyl groups in the presence of an organotin catalyst;
(3) In the presence of a photopolymerization catalyst, an organopolysiloxane containing an alkenyl group, an organopolysiloxane containing a mercapto group, and a cured "radical addition type silicone resin", and (4) an onium salt with an epoxy group A “cationically polymerizable silicone resin” that is cured by photo-ring-opening with an initiator is exemplified.
Among these, the addition reaction type silicone resin is preferable from the viewpoint of easy peeling between the main body portion and the peeling portion.
More preferably, the silicone resin is an addition-reactive silicone resin obtained by heating and curing an organohydrogenpolysiloxane and a polydimethylsiloxane having a terminal vinyl group.

The content of the silicone resin in the release layer is preferably 90% by mass or more and 99.5% by mass or less, more preferably 95% by mass or more and 99% by mass or less. As a result, the ease of separation between the separation portion and the main body portion can be further improved.

The release layer contains a silicone filler, and examples of the silicone filler include silicone rubber fillers, silicone resin fillers and coated silicone fillers.
The silicone rubber filler refers to particles of silicone rubber obtained by cross-linking linear dimethylpolysiloxane. For example, a crosslinked product of linear dialkylpolysiloxane (for example, dimethylpolysiloxane) may be mentioned.
Further, the silicone resin filler is a three-dimensional network in which the siloxane bond is represented by (RSiO _3/2 ) _n (wherein R is an alkyl group having 1 to 3 carbon atoms and n is a positive integer). It refers to particles of cured polyorganosilsesquioxane having a structure. Examples include polymethylsilsesquioxane particles.
The coated silicone filler refers to particles obtained by coating the surfaces of silicone rubber particles with a silicone resin.

The average particle size of the silicone filler is preferably 1.5 μm or more and 5 μm or less, more preferably 2 μm or more and 4.5 μm or less. This makes it possible to make spike marks on the back surface of the printed material inconspicuous, and to prevent the silicone filler from slipping down from the release layer.
In addition, in this invention, the average particle diameter of a silicone filler is measured based on JISZ1189.

The content of the silicone filler in the release layer is preferably 0.5% by mass or more and 15% by mass or less, more preferably 1% by mass or more and 10% by mass or less. This makes it possible to make spike marks on the back surface of the printed material inconspicuous, and to prevent the silicone filler from slipping down from the release layer.

The release layer may contain resin materials other than silicone resins, fillers other than silicone fillers, silicone oils, waxes, metal soaps, the above additives, and the like, as long as the properties of the present invention are not impaired.

The thickness of the release layer is preferably 0.5 μm or more and 4 μm or less, more preferably 1 μm or more and 2 μm or less. As a result, the occurrence of spike marks can be more significantly prevented, and spike marks that have occurred can be made inconspicuous. Moreover, it is possible to prevent the silicone filler from sliding down from the release layer.

The ratio of the average particle diameter of the silicone filler to the thickness of the release layer (average particle diameter of the silicone filler/thickness of the release layer) is preferably 1 or more and 4.5 or less, and 2 or more and 3 or less. It is more preferable to have This can prevent the silicone filler from sliding down from the release layer.

The glossiness of the release portion side surface of the release layer formed on the substrate is preferably 5% or more and 60% or less, more preferably 5% or more and 30% or less. As a result, the spike marks that have occurred on the back surface of the printed matter can be made inconspicuous.
In the present invention, the glossiness of the release layer means the glossiness of the release portion side surface of the release layer after the release portion is separated from the thermal transfer image-receiving sheet. Measured with an angle of incidence of 45°.

The release layer is formed by dispersing or dissolving the above material in water or an appropriate solvent to form a coating liquid, which is applied by a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, or a bar coating method. and by known means such as a rod coating method, to form a coating film on a base material, and then dry the coating film.

(Base material)
As the substrate, a resin film composed of resin materials such as polyester, polyamide, polyolefin, vinyl resin, (meth)acrylic resin, imide resin, cellulose resin, styrene resin, polycarbonate and ionomer resin can be used.
Among these, polyester is preferred, and PET is more preferred, from the viewpoint of the mechanical strength of the thermal transfer image-receiving sheet.
Further, the resin film may be a non-stretched film, a uniaxially stretched film, or a biaxially stretched film.

An image may be formed on the base material, and the image is not particularly limited, and characters, symbols, patterns, hologram images, etc. can be appropriately formed.

The thickness of the substrate is preferably 10 μm or more and 50 μm or less, more preferably 15 μm or more and 40 μm or less. Thereby, the mechanical strength of the thermal transfer image-receiving sheet can be further improved. Also, the ease of cutting the thermal transfer image-receiving sheet can be improved.

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

The receiving layer can contain resin materials such as polyolefins, vinyl resins, (meth)acrylic resins, cellulose resins, polyesters, polyamides, polycarbonates, styrene resins, polyurethanes and ionomer resins.

The content of the resin material in the receiving layer is not particularly limited, and can be, for example, 80% by mass or more and 98% by mass or less.

In one embodiment, the receptive layer includes a release material. Thereby, the releasability from the thermal transfer sheet can be improved.
Examples of release materials include solid waxes such as polyethylene wax, polyamide wax, and Teflon (registered trademark) powder, fluorine-based or phosphate ester-based surfactants, silicone oil, reactive silicone oil, curable silicone oil, and the like. Examples include various modified silicone oils and silicone resins.
Although an oily silicone oil can be used as the silicone oil, a modified silicone oil is preferred. As the modified silicone oil, amino-modified silicone, epoxy-modified silicone, aralkyl-modified silicone, epoxy-aralkyl-modified silicone, alcohol-modified silicone, vinyl-modified silicone, urethane-modified silicone, etc. can be preferably used. , epoxy-aralkyl-modified silicones are particularly preferred.

The content of the release material in the receiving layer is preferably 0.5% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 10% by mass or less. Thereby, the releasability from the thermal transfer sheet can be further improved.

Moreover, the receiving layer can contain the above-described additives within a range that does not impair the characteristics of the present invention.

The thickness of the receiving layer is preferably 0.5 μm or more and 20 μm or less, more preferably 1.0 μm or more and 10 μm or less. Thereby, the density of the image formed on the receiving layer can be improved.

The receiving layer is prepared by dispersing or dissolving the above materials in water or an appropriate solvent to form a coating liquid, which is applied by roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating and rod coating. It can be formed by coating a base material or a primer layer described later to form a coating film by a known means such as a coating method, and drying the film.

(Porous layer)
In one embodiment, the thermal transfer sheet of the present invention comprises a porous layer between the substrate and the receiving layer, thereby improving the density of the image formed on the receiving layer.
As the porous layer, for example, a porous resin film having fine voids inside can be used.

The porous layer contains at least one resin material, examples of which include polyesters, polyamides, polyolefins, vinyl resins, (meth)acrylic resins, imide resins, cellulose resins, styrene resins, polycarbonates, and ionomer resins.

The porous layer can contain the above additives as long as the properties of the present invention are not impaired.

The thickness of the porous layer is preferably 20 μm or more and 100 μm or less, and more preferably 30 μm or more and 80 μm or less. This can further improve the image density formed on the receiving layer. In addition, ease of cutting can be improved.

The porous resin film using the above-described resin material or the like can be produced by a known method. For example, the above-described resin material is kneaded with immiscible organic particles or inorganic particles to form a film. It can be produced by
In one embodiment, the porous resin film can be produced by forming a film from a mixture containing a first resin material and a second resin material having a higher melting point than the first resin material. In this case, the second resin material functions as a core material that forms fine voids. The amount of the second resin material mixed is preferably 2 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the first resin material. For example, a porous resin film can be produced by forming a film from a mixture containing polypropylene as the first resin material and acrylic resin as the second resin material.
Moreover, the film may be a uniaxially stretched film or a biaxially stretched film.
Moreover, you may use the porous film marketed.

(adhesion layer)
In one embodiment, the thermal transfer image-receiving sheet of the present invention comprises an adhesive layer between the substrate and the porous layer, thereby improving adhesion therebetween.

In one embodiment, the adhesive layer can contain a resin material that is melted or softened by heat and develops adhesiveness, such as polyvinyl acetate, PVB, ethylene-vinyl acetate copolymer and vinyl chloride-vinyl acetate. Vinyl resins such as copolymers, polyolefins such as PE and PP, polyesters such as PET and PBT, polyamides, imide resins, (meth)acrylic resins such as poly(meth)acrylate and polymethyl(meth)acrylate, cellulose diastase and the like Examples include cellulose resins and polyurethanes.

The content of the resin material in the adhesive layer is preferably 50% by mass or more, more preferably 70% by mass or more. Thereby, the adhesion between the substrate and the porous layer can be improved.

In one embodiment, the adhesive layer also includes an isocyanate compound, such as polyisocyanates such as diisocyanates and triisocyanates.
Aromatic polyisocyanate is a terminal isocyanate group-containing compound (polyhydric alcohol adduct of aromatic diisocyanate) obtained by reacting an excess amount of diisocyanate compound with polyhydric alcohol. Examples of diisocyanate compounds include tolylene-2,6-diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate and tetramethylxylylene diisocyanate. Examples of polyhydric alcohols include , ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, ditrimethylolpropane and dipentaerythritol.

The content of the isocyanate compound in the adhesive layer is adjusted so that the molar equivalent ratio (-NCO/-OH) between the isocyanate group of the isocyanate compound and the hydroxyl group of the resin material is 0.1 or more and 2.0 or less. is preferred.

Moreover, the adhesive layer can contain the above-described additives within a range that does not impair the characteristics of the present invention.

The thickness of the adhesive layer is not particularly limited, but can be, for example, 1 μm or more and 10 μm or less.

The adhesive layer is formed by dispersing or dissolving the above materials in water or an appropriate solvent to form a coating liquid, which is applied by roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating and rod coating. It can be formed by coating the base material to form a coating film by a known means such as a coating method, and drying the film.

(primer layer)
The thermal transfer image-receiving sheet of the present invention can be provided with a primer layer between the substrate or porous layer and the receiving layer, thereby improving adhesion between these layers.

The primer layer contains a resin material such as polyester, polyurethane, polycarbonate, (meth)acrylic resin, styrene resin, vinyl resin and cellulose resin.

In addition, the primer layer can contain the above-described additives within a range that does not impair the characteristics of the present invention.

The thickness of the primer layer is not particularly limited, and can be, for example, 0.5 μm or more and 3 μm or less.

The primer layer is formed by dispersing or dissolving the above materials in water or an appropriate solvent to form a coating liquid, which is applied by roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating and rod coating. It can be formed by coating the base material to form a coating film by a known means such as a coating method, and drying the film.

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In addition, hereinafter, contents, compounding ratios, etc. are based on mass unless otherwise described.

Example 1
A 25 μm thick PET film (manufactured by Toray Industries, Inc., Lumirror (registered trademark) T-60, density: 1.40 g/m ³ ) was prepared as a base material, and a gravure film was applied to one surface of the PET film. A pattern image was formed by printing.

On the image forming surface of the PET film, a coating solution for forming an adhesive layer having the following composition is applied and dried to form an adhesive layer having a thickness of 4 μm. A 75 μm porous PET film (manufactured by Toyobo Co., Ltd., Crisper (registered trademark) film, porosity 29%) was laminated.
(Coating liquid for forming adhesive layer)
・ Polyurethane 30 parts by mass (manufactured by Mitsui Chemicals, Inc., Takelac (registered trademark) A-969V)
- Isocyanate compound 10 parts by mass (manufactured by Mitsui Chemicals, Inc., Takenate (registered trademark) A-5)
・ Ethyl acetate 60 parts by mass

A primer layer-forming coating liquid having the following composition was applied onto the porous layer and dried to form a primer layer having a thickness of 1 μm.
(Coating liquid for forming primer layer)
・Polyurethane 5 parts by mass (manufactured by Nippon Polyurethane Industry Co., Ltd., N-5199)
・ Anatase type titanium oxide 10 parts by mass (manufactured by Sakai Chemical Industry Co., Ltd., TCA-888)
・ Isocyanate compound 2 parts by mass (manufactured by Mitsui Chemicals, Inc., Takenate (registered trademark) A-14)
・Toluene 8 parts by mass ・Methyl ethyl ketone (MEK) 8 parts by mass ・Isopropanol (IPA) 4 parts by mass

A receiving layer forming coating liquid having the following composition was applied onto the primer layer formed as described above and dried to form a receiving layer having a thickness of 4 μm.
(Coating solution for forming receptor layer)
・Vinyl chloride-vinyl acetate copolymer 12 parts by mass (manufactured by Nissin Chemical Industry Co., Ltd., Solbin (registered trademark) C)
・ 0.8 parts by mass of epoxy-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-3000T)
· Amino-modified silicone 0.24 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-1660B-3)
・Toluene 30 parts by mass ・MEK 30 parts by mass

A release layer-forming coating liquid having the following composition was applied to the other surface of the substrate and dried to form a release layer having a thickness of 1 μm.
(Coating liquid for forming release layer)
・ Silicone resin 95 parts by mass (Shin-Etsu Chemical Co., Ltd., KS-847H)
・ Silicone filler A 5 parts by mass (manufactured by Nippon Shokubai Co., Ltd., Eposter (registered trademark) 120, average particle size 2 μm)
・Toluene 200 parts by mass

On the release layer formed as described above, a coating solution for forming an adhesive layer having the following composition is applied and dried to form an adhesive layer having a thickness of 8 μm, and the release substrate is passed through the adhesive layer. A 25 μm-thick PET film (Lumirror (registered trademark) T-60, manufactured by Toray Industries, Inc., density: 1.40 g/cm ³ ) was laminated as a thermal transfer image-receiving sheet of the present invention.
(Coating liquid for forming adhesive layer)
・ 15 parts by mass of acrylic copolymer (manufactured by Soken Chemical Co., Ltd., SK Dyne 1251)
・ Isocyanate compound 0.33 parts by mass (manufactured by Soken Chemical Co., Ltd., curing agent L-45)
・ Epoxy resin 0.1 parts by mass (manufactured by Soken Chemical Co., Ltd., curing agent E-AX)
・Ethyl acetate 16.14 parts by mass

After peeling off the release base material and the adhesive layer included in the thermal transfer image-receiving sheet produced as described above, the glossiness of the release layer was measured according to JIS Z 8741 at an incident angle of 45°. was 0.3%. Further, in the following examples and comparative examples, the glossiness of the release layer was similarly measured and summarized in Table 1.

Example 2
Except that the release substrate was changed from a PET film with a thickness of 25 μm to a PET film with a thickness of 50 μm (Mitsubishi Chemical Corporation, Diafoil (registered trademark) S100-50, density: 1.40 g/cm ³ ). produced a thermal transfer image-receiving sheet in the same manner as in Example 1.

Example 3
Examples except that the release substrate was changed from a PET film having a thickness of 25 μm to a PP film having a thickness of 30 μm (manufactured by Futamura Chemical Co., Ltd., FOS-BT#30, density: 0.91 g/cm ³ ). A thermal transfer image-receiving sheet was prepared in the same manner as in 1.

Example 4
Examples except that the release substrate was changed from a PET film with a thickness of 25 μm to a PP film with a thickness of 60 μm (manufactured by Futamura Chemical Co., Ltd., FOS-BT#60, density: 0.91 g/cm ³ ). A thermal transfer image-receiving sheet was prepared in the same manner as in 1.

Example 5
Example 1 except that the silicone filler A used to form the release layer was changed to silicone filler B (Tospearl (registered trademark) 130, manufactured by Momentive Performance Materials Japan LLC, average particle size 3 μm). A thermal transfer image-receiving sheet was prepared in the same manner as above.

Example 6
Silicone filler A used to form the release layer was changed to silicone filler B (Tospearl (registered trademark) 145, average particle size 4.5 μm, manufactured by Momentive Performance Materials Japan LLC), and the release layer was changed to A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the layer thickness was changed to 2 μm.

Example 7
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the thickness of the release layer was changed to 2 μm.

Example 8
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that silicone filler A used for forming the release layer was changed to silicone filler B.

Comparative example 1
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the release layer-forming coating liquid was changed to one having the following composition.
(Coating liquid for forming release layer)
・ Silicone resin 100 parts by mass (Shin-Etsu Chemical Co., Ltd., KS-847H)
・Toluene 200 parts by mass

Comparative example 2
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the release layer-forming coating liquid was changed to one having the following composition.
(Coating liquid for forming release layer)
・ Silicone resin 95 parts by mass (Shin-Etsu Chemical Co., Ltd., KS-847H)
・ (Meth) acrylic filler 5 parts by mass (manufactured by Nippon Shokubai Co., Ltd., Eposter (registered trademark) MA1002, average particle size 2 μm)
・Toluene 200 parts by mass

Comparative example 3
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the release layer-forming coating liquid was changed to one having the following composition.
(Coating liquid for forming release layer)
・ Silicone resin 95 parts by mass (Shin-Etsu Chemical Co., Ltd., KS-847H)
・ Melamine filler 5 parts by mass (manufactured by Nippon Shokubai Co., Ltd., Eposter (registered trademark) MS, average particle size 2 μm)
・Toluene 200 parts by mass

Comparative example 4
The same as in Example 1, except that the release substrate was changed from a PET film having a thickness of 25 μm to a PP film having a thickness of 18 μm (HO402 manufactured by Hwasho Industry Co., Ltd., density: 0.9 g/cm ³ ). Then, a thermal transfer image-receiving sheet was produced.

Comparative example 5
A thermal transfer image-receiving sheet was produced in the same manner as in Example 1, except that the release layer-forming coating liquid was changed to one having the following composition.
(Coating liquid for forming release layer)
・ (Meth) acrylic resin 95 parts by mass (manufactured by Daicel Corporation, Celltop (registered trademark) 226)
・ Silicone filler A 5 parts by mass (Tospearl (registered trademark) 120, average particle size 2 μm, manufactured by Momentive Performance Materials Japan LLC)
・Toluene 200 parts by mass

Performance evaluation <<design evaluation>>
A half gray image (128/ 255 gradations) were formed, the peeling portion was peeled off to obtain a print.
The back surface of the print was visually observed and evaluated according to the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: Almost no spike marks were observed on the back side of the printed matter, and they were not conspicuous, and the image formed on the substrate was well confirmed.
B: Spike marks were observed on the back side of the printed matter, but they were not conspicuous, and the image formed on the substrate was confirmed.
NG: Conspicuous spike marks were observed on the back side of the print, which affected the image formed on the substrate.

<<Evaluation of anti-slip property of filler>>
The peeled portions of the thermal transfer image-receiving sheets obtained in the above Examples and Comparative Examples were peeled off at 90°, and the surface of the adhesive layer after peeling was visually observed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: Sliding down of the filler was not observed.
B: Sliding down of the filler was observed a little.
NG: A lot of filler slipping was observed.

<<Evaluation of ease of peeling>>
The peel force between the adhesive layer and the release layer of the thermal transfer image-receiving sheets obtained in the above Examples and Comparative Examples was measured in an environment of 25 ° C. and 50% relative humidity in accordance with JIS K 6854-3. and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: The peel force was less than 0.15N.
B: The peel force was 0.15N or more and less than 1N.
NG: The peel force was 1N or more.

<<Evaluation of ease of cutting>>
Using the thermal transfer image-receiving sheets obtained in the above examples and comparative examples, 10,000 prints were produced in the same manner as in the design evaluation. The cut end face of the printed matter after production was visually observed, and the easiness of cutting the thermal transfer image-receiving sheet was evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
A: No fluffing or the like was observed on the cut end surface.
B: Slight fluffing was observed on the cut end surface, but it was of a degree of practically no problem.
C: 10,000 prints could not be produced due to a defective cutter.

10: thermal transfer image-receiving sheet, 11: release part, 12: release layer, 13: base material, 14: receiving layer, 15: body part, 16: release base material, 17: adhesive layer, 18: adhesive layer, 19: Porous layer 20: primer layer

Claims (8)

A body portion comprising a release portion, a release layer, a base material and a receiving layer,
The release layer contains a silicone resin and a silicone filler, the content of the silicone filler in the release layer is 1% by mass or more and 10% by mass or less, and the average particle size of the silicone filler and the release layer A ratio of the thickness of the layer (average particle size of the silicone filler/thickness of the release layer) is 2 or more and 3 or less,
The peeling portion has a thickness of 20 μm or more and 100 μm or less, and the peeling portion is a layer that is peeled off from the release layer.
Thermal transfer image receiving sheet. 2. The thermal transfer image-receiving sheet according to claim 1, wherein the release layer has a surface glossiness of 5% or more and 60% or less. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the silicone filler has an average particle size of 1.5 [mu]m or more and 5 [mu]m or less. The thermal transfer image-receiving sheet according to any one of claims 1 to 3, wherein the release layer has a thickness of 1 µm or more and 2 µm or less. The thermal transfer image-receiving sheet according to any one of Claims 1 to 4 , wherein the release portion comprises a release base material and an adhesive layer. The thermal transfer image-receiving sheet according to any one of Claims 1 to 5 , wherein the body portion comprises an adhesive layer and a porous layer between the substrate and the receiving layer. The thermal transfer image-receiving sheet according to any one of claims 1 to 6 , wherein the main body portion comprises a primer layer between the substrate or porous layer and the receiving layer. A step of forming an image on the receiving layer of the thermal transfer image receiving sheet according to any one of claims 1 to 7 , using a thermal transfer printer and a thermal transfer sheet having a dye layer containing a sublimation dye;
In the thermal transfer image-receiving sheet after image formation, a step of peeling the peeling portion from the release layer to obtain a print;
A method for producing a print, comprising:

Images