JP2009285830A - Heat transfer receiving sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat transfer receiving sheet which shows successful protective layer transferability of an ink ribbon to a receiving layer surface even during rapid printing, excellent release performance from the ink ribbon, high recording density, and excellent light resistance of an image. <P>SOLUTION: This heat transfer receiving sheet has a sheet-like support and an image-receiving layer formed on at least one surface of the sheet-like support. The image-receiving layer contains: a polyester resin obtained by polycondensing a polyhydric carboxylic acid component ≥75 mol% of the total component of which is isophthalic acid, and a polyhydric alcohol component composed mainly of an aliphatic polyhydric alcohol and/or an alicyclic polyhydric alcohol; a urethane resin; and a compound with a hydrolytic alkoxysilyl group and an epoxy group in one molecule. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal transfer receiving sheet (hereinafter also simply referred to as a receiving sheet) having an image receiving layer (hereinafter also simply referred to as a receiving layer) containing a dye dyeable thermoplastic resin as a main component. More specifically, the present invention has a high recording density and good light fastness of an image, and is capable of peeling from an ink sheet (hereinafter also referred to as an ink ribbon) from a dye layer even during high-speed printing, and an ink ribbon. The receiving sheet is excellent in adhesiveness to the transfer type laminate layer (hereinafter also simply referred to as a protective layer).

  In the dye thermal transfer method, the ink ribbon and the receiving sheet are overlapped, the sublimation dye of the ink ribbon dye layer is transferred onto the receiving layer of the receiving sheet by heat supplied from a thermal head, etc., and then both are peeled off. An image is formed. Examples of the dye dyeable resin used in the receiving layer include vinyl chloride resins, polyester resins, polyvinyl butyral resins, acrylic resins, and cellulose resins, and silicone release agents and fluorine resins as release agents. Release agents, fatty acid release agents, and the like have been proposed.

  In recent years, in order to improve image storability such as light resistance and grease resistance, an “overlaminate” method in which a protective layer is provided after sequentially transferring three-color or four-color dyes on an ink ribbon has become mainstream. . In this system, it is necessary to realize the opposite physical properties that the receiving layer has peelability with respect to the surface of the dye layer of the ink ribbon and has adhesion with the surface of the protective layer of the ink ribbon. The coexistence of peelability and adhesiveness could be dealt with by using vinyl chloride resin or cellulose resin as the dye-dyeing thermoplastic resin in the receiving layer. In recent years, the use of cellulose resin has been avoided because of its tendency to occur, and the cellulose-based resin has a low recording density. The use of plasticizers has been proposed to increase the recording density of cellulosic resins. However, when printing images are stored under high temperature and high humidity, the images blur, and when stored for a long period of time, the plasticizers bleed out and become normal. In some cases, images could not be recorded.

  On the other hand, a polyester resin has been conventionally used as a dye dyeing resin having a high recording density (see, for example, Patent Documents 1 to 5). For example, a polyester having a low glass transition temperature in order to obtain a high printing density. When the resin is used, the heat resistance of the receiving layer is lowered, and there is a problem that the receiving layer may be fused to the ink ribbon depending on the design conditions of the printer. In recent years, the speed of printers has been increasing, and after printing, the ink ribbon and the receiving layer tend to be peeled off in a shorter time, and the heat resistance of the receiving layer has become important, and at lower energy A receiving layer capable of obtaining a high recording density is demanded.

  Further, when a polyester resin is used, there is a problem that it is difficult to achieve both the peelability of the receiving layer from the ink ribbon and the adhesiveness with the heat transferable protective layer. Polyester resins usually have heat resistance by using a curing agent such as isocyanate, but the number of molecular structural sites that can be chemically bonded to the heat transferable protective layer is reduced, and the functional group of the polyester resin is increased by using a large amount of the curing agent. If it is used for crosslinking with a curing agent, adhesion to the heat transferable protective layer cannot be obtained. On the other hand, sufficient heat resistance cannot be obtained if the amount of the curing agent used is suppressed in order to obtain adhesion with the heat transferable protective layer.

  Conventionally, a saturated polyester resin is a dye-dyeable resin that provides a high printing density. However, the heat resistance of the receiving layer is low, and a part of the receiving layer is fused in a high-energy printing to reduce the printing density. There are drawbacks in that the phenomenon occurs, the adhesiveness with the protective layer is poor, and the protective layer is difficult to transfer. In order to compensate for these disadvantages, proposals have been made to use cellulose acetate butyrate (also referred to as cellulose acetate butyrate, CAB) in combination, but these are poorly compatible and provide a uniform coating solution. There is a problem that the printing density is remarkably lowered.

  Further, in order to avoid an obstacle in which the receiving layer is fused to the ink ribbon, it has been proposed to increase the heat resistance of the receiving layer by using a polyester resin having a branched structure (for example, see Patent Document 6). . However, in recent years, the speed of printers has increased, and the improvement in heat resistance due to the branch structure as described above has a problem in that the dye density of the dye is impaired and the printing density is lowered. Further, a polyester resin mainly composed of aromatics has been proposed as a method for improving the printing density (see, for example, Patent Document 7), but has a drawback that the light resistance is significantly reduced.

JP 57-107885 A (first page) Japanese Patent Laid-Open No. 5-581 (page 2) JP-A-5-64978 (2nd page) JP-A-5-238167 (2nd page) Japanese Patent Laying-Open No. 2003-200668 (second page) Japanese Patent Laid-Open No. 2-112991 (first page) JP-A-2-34392 (first page)

  The object of the present invention is to improve the above-mentioned drawbacks of the prior art, provide excellent transferability of the protective layer of the ink ribbon to the receiving layer surface even during high-speed printing, excellent peeling performance from the ink ribbon, and high recording density. It is intended to provide a receiving sheet with good light resistance.

The present invention includes the following inventions.
(1) In a thermal transfer receiving sheet having a sheet-like support and an image receiving layer formed on at least one surface of the sheet-like support, the image receiving layer is 75 mol% or more of all the components of the polyvalent carboxylic acid. A polyester resin obtained by polycondensation of a polyhydric carboxylic acid component in which is isophthalic acid and a polyhydric alcohol component mainly composed of an aliphatic polyhydric alcohol and / or an alicyclic polyhydric alcohol, and a urethane resin Thermal transfer receiving sheet characterized by
(2) The thermal transfer receiving sheet according to item (1), wherein a mass ratio of the content of the polyester resin and the urethane resin is 40/60 to 95/5.

(3) The thermal transfer receiving sheet according to item (1) or (2), wherein the polyester resin has a glass transition temperature of 30 to 90 ° C and the urethane resin has a glass transition temperature of -50 to 40 ° C.
(4) The image receiving layer further has an overcoat layer containing a silicone graft copolymer resin, and the coating amount of the overcoat layer is 1 to 25 mg / m ² (1) to (3) The thermal transfer receiving sheet according to any one of the items.
(5) The thermal transfer receptor according to any one of (1) to (4), wherein the image receiving layer is crosslinked with a compound having both a hydrolyzable alkoxysilyl group and an epoxy group in one molecule. Sheet.

  The receiving sheet of the present invention is a receiving sheet that is excellent in peelability from the ink ribbon while maintaining a high printing density and good light resistance, and has a good transfer property of the protective layer of the ink ribbon. It is useful for various thermal transfer type full-color printers.

(Receptive layer)
The present invention is characterized in that in a receiving sheet formed by forming a receiving layer on at least one surface of a sheet-like support, the receiving layer contains a polyester resin having a specific composition in the molecule and a urethane resin. Is.
The polyester resin used in the receiving layer of the present invention is synthesized by polycondensation of a polyvalent carboxylic acid component and a polyhydric alcohol component.

(Polyvalent carboxylic acid component)
The polyester resin used in the receiving layer of the present invention is characterized in that the total polyvalent carboxylic acid component of the polyester resin contains 75 mol% or more of an isophthalic acid component, more preferably a polyvalent carboxylic acid. All components contain 85 to 100 mol% of isophthalic acid. If the isophthalic acid component is less than 75 mol%, the light resistance of the resulting polyester resin may be lowered.

  Further, in the polyvalent carboxylic acid component used in the present invention, it is also possible to use an alicyclic dicarboxylic acid, an aliphatic dicarboxylic acid, or an aromatic dicarboxylic acid other than isophthalic acid as long as the effects of the present invention are not impaired. is there. Examples of the alicyclic dicarboxylic acid include those having at least one alicyclic ring in the molecule as a basic skeleton of the molecular structure. Specifically, the alicyclic ring is preferably a cyclopropane ring, cyclobutane ring, cyclopentane ring, cyclohexane ring, decalin ring, norbornane ring, adamantane ring, or the like.

  Specific examples of the alicyclic dicarboxylic acid include 1,4-cyclohexanedicarboxylic acid, 2-methyl-1,4-cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, 2-propyl-1,4. -Cyclohexanedicarboxylic acid, 2-butyl-1,4-cyclohexanedicarboxylic acid, 2-t-butyl-1,4-cyclohexanedicarboxylic acid, 2,3-dimethyl-1,4-cyclohexanedicarboxylic acid, 2,3-diethyl -1,4-cyclohexanedicarboxylic acid, 2,3-dipropyl-1,4-cyclohexanedicarboxylic acid, 2,3-dibutyl-1,4-cyclohexanedicarboxylic acid, 2-methyl-3-ethyl-1,4-cyclohexane Dicarboxylic acid, 2-methyl-3-propyl-1,4-cyclohexanedicarboxylic acid, 2-methyl -3-butyl-1,4-cyclohexanedicarboxylic acid, 2-ethyl-3-propyl-1,4-cyclohexanedicarboxylic acid, 2-ethyl-3-butyl-1,4-cyclohexanedicarboxylic acid, 2-methyl-3 1,4-cyclohexanedicarboxylic acid such as t-butyl-1,4-cyclohexanedicarboxylic acid and alkyl derivatives thereof,

  2,6-decalin dicarboxylic acid, 3-methyl-2,6-decalin dicarboxylic acid, 3-ethyl-2,6-decalin dicarboxylic acid, 3-propyl-2,6-decalin dicarboxylic acid, 3-butyl- 2,6-decalin dicarboxylic acid, 3,4-dimethyl-2,6-decalin dicarboxylic acid, 3,4-diethyl-2,6-decalin dicarboxylic acid, 3,4-dipropyl-2,6-decalin dicarboxylic acid, 3,4-dibutyl-2,6-decalin dicarboxylic acid, 3,8-dimethyl-2,6-decalin dicarboxylic acid, 3,8-diethyl-2,6-decalin dicarboxylic acid, 3,8-dipropyl-2, 6-decalin dicarboxylic acid, 3,8-dibutyl-2,6-decalin dicarboxylic acid, 3-methyl-4-ethyl-2,6-decalin dicarboxylic acid, 3-methyl-4-propyl 2,6-decalin dicarboxylic acid such as pill-2,6-decalin dicarboxylic acid, 3-methyl-4-butyl-2,6-decalin dicarboxylic acid, 3-ethyl-4-butyl-2,6-decalin dicarboxylic acid And alkyl derivatives thereof,

  Also, cyclopropanedicarboxylic acid, cyclobutanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 3-methyl-1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid 1,2-cyclopentanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 2,3-norbornanedicarboxylic acid, adamantanedicarboxylic acid, dimethyladamantanedicarboxylic acid, tricyclodecanedicarboxylic acid, 4,4′-carboxymethylcyclohexane 4,4′-carboxyethylcyclohexane and the like.

  As aromatic dicarboxylic acids other than isophthalic acid, the basic skeleton of the molecular structure has one aromatic ring, and two independent aromatic rings in the form of biphenyl, diphenylmethane, bibenzyl, stilbene, etc. Those having ˜3, and those having a condensed ring of 5-membered or 6-membered carbocyclic ring on the aromatic ring such as indene and tetralin can be used. Carbon number of this aromatic dicarboxylic acid is the range of 8-30 normally, Preferably it is 8-20, More preferably, it is the range of 8-15.

  Specific examples of the aromatic dicarboxylic acid include terephthalic acid, phthalic acid, P-xylylene dicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 4,4 Examples include '-diphenyldicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylpropanedicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-benzophenone dicarboxylic acid, and the like.

  Examples of the derivative of the carboxylic acid used in the same manner as the polyvalent carboxylic acid include ester compounds, acid anhydrides, and acid halides of the dicarboxylic acid. Among these, ester compounds and acid anhydrides are preferable, and ester compounds containing a lower alkyl group having 1 to 6 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, amyl, hexyl and the like are particularly preferable. .

  As a polyvalent acid component of the polyester resin of the present invention, an aliphatic dicarboxylic acid or the like may be contained as necessary in addition to the above-described alicyclic and aromatic dicarboxylic acids as long as the effects of the present invention are not impaired. Good. Examples of the aliphatic dicarboxylic acid include linear or branched aliphatic dicarboxylic acids and derivatives thereof such as ester compounds, acid halides, and acid anhydrides. Aliphatic dicarboxylic acids include malonic acid, methylmalonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, isosebacic acid, brassic acid, dodecanedicarboxylic acid, poly Examples thereof include aliphatic saturated dicarboxylic acids such as alkenyl succinic acid, aliphatic unsaturated dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, and glutaconic acid, dimer acid of polymerized fatty acid, and hydrogenated dimer acid. Among these, adipic acid, sebacic acid, succinic anhydride, and maleic anhydride are preferably used.

  In the present invention, as a polyvalent carboxylic acid component, a carboxylic acid having a valence of 3 or more can be contained for the purpose of forming a branched structure of the polyester resin and increasing the glass transition temperature within a range not impairing the effects of the present invention. Specific examples of the trivalent or higher carboxylic acid component include, for example, trimellitic acid, tricarballylic acid, camphoric acid, trimesic acid, 1,2,5-naphthalenetricarboxylic acid, 2,3,6-naphthalenetricarboxylic acid, , 8,4-naphthalenetricarboxylic acid, pyromellitic acid, benzophenone tetracarboxylic acid, trivalent or higher carboxylic acids such as trimer acid of polymerized fatty acid, ester compounds and acid anhydrides thereof. The content of the compound is preferably 0.5 to 10 mol%, more preferably 1 to 7 mol% in the total carboxylic acid component.

  The polyvalent carboxylic acid component used in the present invention includes formic acid, acetic acid, butyric acid, 2-methylpropanoic acid, valeric acid, isooctylic acid, lauric acid, myristic acid, palmitic acid as long as the effects of the present invention are not impaired. Monovalent carboxylic acids such as acid, stearyl acid, isostearyl acid, arachidic acid, linoleic acid, oleic acid, elaidic acid, tall fatty acid and / or ester compounds thereof may be contained. The content of these compounds is usually 10% by mass or less, preferably 5% by mass or less, more preferably 2% by mass or less in the polyvalent carboxylic acid component.

(Polyhydric alcohol component)
The polyester resin used in the receiving layer of the present invention is characterized by containing an alicyclic polyhydric alcohol and / or an aliphatic polyhydric alcohol as a main component as a polyhydric alcohol component, and more in terms of light resistance and the like. Excellent. As for the total content of alicyclic polyhydric alcohol and / or aliphatic polyhydric alcohol, 50-100 mol% is preferable in all the components of polyhydric alcohol.
As the alicyclic or aliphatic polyhydric alcohol, mainly alicyclic glycols and aliphatic glycols are preferably used. These may be used alone or in appropriate combination of two or more. May be used.

  Specific examples of the alicyclic glycol include 1,4-cyclohexanediol, 1,2-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane dimethanol, and hydrogenated BIS-. A (hydrogenated bisphenol A), 1,2-cyclopentanediol, 1,4-cyclooctanediol, 2,5-norbornanediol, adamantanediol and the like. Of these, 1,4-cyclohexanedimethanol, tricyclodecane dimethanol, hydrogenated BISA and the like are preferably used.

  Specific examples include aliphatic glycols, such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,2-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl. Examples include glycol, 2-n-butyl-2-ethyl-1,3-propanediol, diethylene glycol, triethylene glycol, polyethylene glycol, and polytetramethylene glycol. Of these, ethylene glycol, neopentyl glycol and the like are preferably used.

  In addition to the glycol component, polycondensation can be performed by adding a trihydric or higher polyhydric alcohol. Specific examples of trihydric or higher alcohol compounds include glycerol compounds such as glycerin, diglycerol and polyglycerol, and methylol compounds such as trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol, ditrimethylolpropane and dipentaerythritol. Is mentioned. The content of these compounds is preferably 0.5 to 10 mol%, more preferably 1 to 7 mol% in the total alcohol components. If the content of the trihydric or higher polyhydric alcohol component with respect to all alcohol components exceeds 10 mol%, gelation due to crosslinking of the resulting polyester resin becomes remarkable, and the resin solubility may be poor. On the other hand, if it is less than 0.5 mol%, the resulting polyester resin has a small branched structure, and a sufficient heat resistance improvement effect may not be obtained.

  The molecular weight of the polyester resin of the present invention synthesized from the above raw materials is not particularly limited, but is in the range of 3000 to 50000 in terms of polystyrene-equivalent number average molecular weight measured by gel permeation chromatography (GPC). Is preferable, and more preferably in the range of 5000 to 30000. When the number average molecular weight is less than 3000, fusion between the dye receiving layer and the ink ribbon may occur. On the other hand, when the number average molecular weight exceeds 50000, the polyester is used when dissolved in an organic solvent. The viscosity of the resin-containing coating solution increases, and the smoothness of the coated surface may be inferior.

  Furthermore, it is preferable that the glass transition temperature of the polyester resin used by this invention is 30-90 degreeC, More preferably, it is 40-80 degreeC. When the glass transition temperature of the polyester resin is less than 30 ° C., the receiving layer and the ink ribbon may be fused. On the other hand, when the glass transition temperature exceeds 90 ° C., the dyeing property of the receiving layer is poor. A sufficient print density may not be obtained. The glass transition temperature of the polyester resin is appropriately adjusted mainly by the blending ratio of the aromatic component, alicyclic component, aliphatic component, etc. in the polyvalent carboxylic acid component and the polyhydric alcohol component. The glass transition temperature (° C.) of the present invention is a value determined according to JIS K7121.

  The polyester resin used in the receiving layer of the present invention can be selected from organic solvent-soluble type, emulsion, and water-soluble form depending on the coating method and production equipment.

  Furthermore, the present invention is characterized in that a urethane resin is contained in the receiving layer, and the light resistance of the printed matter can be further improved. The mass ratio of the content of the polyester resin and the urethane resin (polyester resin / urethane resin) is preferably in the range of 40/60 to 95/5, more preferably in the range of 50/50 to 90/10. When the mass ratio of the content of the polyester resin and the urethane resin is less than 40/60, the storability of the printed matter in a high temperature and high humidity environment may be deteriorated. On the other hand, if it exceeds 95/5, the light resistance of the printed matter may be insufficient. As for the usage-amount of a urethane resin, 10-50 mass parts is more preferable with respect to 100 mass parts of receiving layer total solid, and 15-40 mass parts is further more preferable.

The urethane resin used in the receiving layer of the present invention is synthesized from polyester, polycarbonate, long-chain polyether, isocyanate, glycol components, etc., but polyacryl, polyamide, polyvinyl chloride, polyvinyl acetate, etc. May be copolymerized with one or two or more types of prepolymers selected from the above, and in particular, polyurethane resins copolymerized with polyacrylic prepolymers are excellent in light resistance and are preferred as the materials used in the present invention.
As in the case of the polyester resin, the form of the urethane resin used for the receiving layer is appropriately selected from organic solvent-soluble type, emulsion, and water-soluble depending on the coating method and the production equipment.

  The glass transition temperature of the urethane resin used in the receptor layer of the present invention is preferably in the range of −50 to 40 ° C., more preferably −40 to 30 ° C. When the glass transition temperature of the urethane resin is less than −50 ° C., the heat resistance of the receiving layer is lowered, and the peelability from the ink ribbon may be deteriorated. Moreover, when the glass transition temperature of a urethane resin exceeds 40 degreeC, the light resistance of a printed matter may become inadequate. The glass transition temperature of the urethane resin is appropriately adjusted depending on the type and blending ratio of the synthetic material such as polyester, long-chain polyether, isocyanate, and glycol component.

Furthermore, in the present invention, it is preferable to provide an overcoat layer containing a silicone graft copolymer resin therein on the receiving layer. By providing the overcoat layer, it becomes possible to obtain a receiving sheet that is excellent in releasability from the ink ribbon and excellent in the transfer property of the protective layer of the ink ribbon. Examples of the silicone graft copolymer resin include those obtained by graft-polymerizing silicone on an acrylic resin, a urethane resin, a polyester resin, a polyamide resin, or the like. The coating amount of the overcoat layer is preferably from 1-25 mg / ^{m 2,} more preferably 2 to 20 mg / ^{m 2,} more preferably from 4~10mg / ^{m 2.} When the coating amount of the overcoat layer is less than 2 mg / m ² , the effect of improving the peelability from the ink ribbon may be insufficient. On the other hand, when it exceeds 20 mg / m ² , there may be a problem in the transferability of the protective layer. is there.

Further, in the present invention, it is preferable that the receptor layer contains a compound having both a hydrolyzable alkoxysilyl group and an epoxy group in one molecule (hereinafter referred to as an alkoxysilyl group epoxy group-containing compound) as a crosslinking agent. A composition in which an epoxy compound is blended as a crosslinking agent with a polymer resin component having an active hydrogen such as an amino group or a carboxyl group can be cured easily at room temperature, giving a cured product having excellent weather resistance and heat resistance. It is known. On the other hand, the hydrolyzable alkoxysilyl group is hydrolyzed to form a siloxane bond by a dehydration condensation reaction of a silanol group. A siloxane bond in which silicon and oxygen are alternately bonded has a feature that it has excellent heat resistance because of its large bond energy.
When the alkoxysilyl group epoxy group-containing compound of the present invention is blended as a crosslinking agent in the receiving layer of the receiving sheet, the dyeing resin in the receiving layer is crosslinked and a siloxane bond is generated by self-crosslinking. It is possible to remarkably improve the heat resistance of the entire receiving layer, and as a result, it is possible to obtain a receiving sheet excellent in peelability from the ink ribbon.
Examples of the alkoxysilyl group-epoxy group-containing compound of the present invention include vinyl polymers having both an alkoxysilyl group and an epoxy group, and silane coupling agents having an epoxy group.
A known method can be applied to obtain a vinyl polymer having both an alkoxysilyl group and an epoxy group, for example, a vinyl monomer having a hydrolyzable alkoxysilyl group such as vinyltrimethoxysilane or vinyltriethoxysilane. And an epoxy group-containing vinyl monomer such as allyl glycidyl ether, methyl glycidyl (meth) acrylate, methyl glycidyl fumarate or dimethyl glycidyl malate can be obtained by a method such as solution radical copolymerization. Examples of the epoxy-containing silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethylcyethoxysilane, and 3-glycidoxypropyltriethoxysilane.
The alkoxysilyl group of the present invention is not particularly limited, but for example, methoxy group, ethoxy group, propoxy group, isopropoxy group, butoxy group, isobutoxy group, t-butoxy group, pentyloxy group, octyloxy group And those in which one or more alkoxy groups, which are reactive groups that are easily hydrolyzed, are bonded to a silicon atom. In addition to an alkoxy group, an alkyl group, an aryl group, an aralkyl group, an amino group, an aminooxy group, a phenoxy group, or the like may be bonded to the silicon atom.
The amount of the alkoxysilyl group-epoxy group-containing compound in the receiving layer is preferably in the range of 0.1 to 10% by mass and more preferably 0.2 to 8% by mass in the receiving layer. If it is less than 0.1% by mass, the effect of improving the peelability is small, and if it exceeds 10% by mass, the dyeing property of the dyeing resin may be impaired, and the printing density may be lowered.
It is also possible to incorporate a known releasable substance in the receiving layer with a blending amount that does not impair the performance of the present invention in order to improve the releasability from the ink ribbon. Although not particularly limited, specifically, epoxy-modified silicone oil, epoxy polyether-modified silicone oil, alcohol-modified silicone oil, dimethyl silicone oil, polyether-modified silicone oil, amino-modified silicone oil, carboxyl-modified silicone oil , Modified silicone oils such as methacrylic acid-modified silicone oils, hydrocarbons such as paraffin wax, polyethylene, fluorocarbon, fatty acids such as stearic acid, aliphatic amides, esters, alcohols, metal soaps, natural waxes These releasable substances are listed. These releasable substances are preferably blended in the range of 0.1 to 20 parts by mass with respect to 100 parts by mass of the dye-dyeable resin of the receiving layer, but are not particularly limited.

  Furthermore, in order to improve releasability, it is also possible to use a known crosslinking agent other than the silyl group-containing polymer resin. For example, the dye-dyeable resin can be crosslinked with a crosslinking agent such as a polyisocyanate compound, epoxy, oxazoline, carbodiimide, or organometallic compound. These crosslinking agents are preferably blended so that the number of functional groups of the crosslinking agent is about 0.1 to 1,000 with respect to the number of functional groups of the dye-dyeable resin.

  In addition to the polyester resin and the urethane resin, a known dye-staining resin may be used in combination as appropriate. Although not particularly limited, for example, polyacetal resins such as cellulose butyrate acetate, polyvinyl formal, polyacetal, polyvinyl butyral, bisphenol A (BPA) type epoxy resin, hydrogenated BPA type epoxy resin, polyvinyl chloride, polychlorinated Vinylidene, polyvinyl acetate, polystyrene, styrene-acrylonitrile copolymer, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, methyl methacrylate-styrene copolymer, polyamide, ethyl cellulose, cellulose acetate, propyl cellulose, One or more of resins such as cellulose nitrate, polycarbonate and phenoxy resin can be used in combination.

  A plasticizer can also be used for the purpose of controlling the dyeing property. Known plasticizers such as phthalate esters, aliphatic dibasic esters, trimellitic esters, phosphate esters, epoxies, and polyesters can be used as plasticizers. It is also possible to do. As a compounding quantity of a plasticizer, about 1-50 mass parts is preferable with respect to 100 mass parts of dye dyeable resin of a receiving layer, and 1-30 mass parts is more preferably used from the balance of bleed-out.

  In order to further improve the light resistance, an ultraviolet absorber (hereinafter referred to as UVA), a hindered amine light stabilizer (hereinafter referred to as HALS), or an antioxidant can be used alone or in combination. is there. In general, benzotriazole UVA, triazine UVA, oxalic acid anilide UVA, and benzophenone UVA are known as UVA. In particular, benzotriazole has a wider absorption wavelength range than other UVAs, and Since it has a maximum absorption peak on the high wavelength side and has a large absorbance, it is preferably used because a particularly excellent effect can be obtained when used in combination with HALS. As the blending amount, 1 to 70 parts by weight is blended with respect to 100 parts by weight of the dye-dyeable resin of the receiving layer. . HALS is a compound having a 2,2,6,6-tetramethylpiperidine skeleton, and is not particularly limited as long as it has this skeleton. HALS is blended in an amount of 1 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin of the receiving layer. In particular, a blend of 1 to 40 parts by weight is preferably used because of the balance between the amount of HALS input and the effect.

The solid coating amount of the receiving layer is preferably about 1 to 12 g / m ² , more preferably ² to 10 g / m ² . Incidentally, if the solid coating amount of the receiving layer is less than 1 g / m ² , the receiving layer cannot completely cover the surface of the support, resulting in a decrease in image quality, or the heating of the thermal head and the receiving layer and the ink ribbon. May cause a fusing problem that would cause adhesion. On the other hand, when the solid coating amount of the receiving layer exceeds 12 g / m ² , not only is the effect saturated and uneconomical, but the strength of the receiving layer is insufficient, the thickness of the receiving layer increases, and the support is thermally insulated. The effect may not be sufficiently exhibited, and the image density may decrease.

(Sheet support)
As the support of the receiving sheet in the present invention, papers mainly composed of cellulose pulp, synthetic resin films and the like are used. For example, paper such as high-quality paper (acidic paper, neutral paper), medium-quality paper, coated paper, art paper, glassine paper, resin-laminated paper, or polyolefin such as polyethylene or polypropylene, polyester such as polyethylene terephthalate, polyamide Films or sheets based on synthetic resins such as polyvinyl chloride, polystyrene, polycarbonate, polyvinyl alcohol, polyvinyl chloride, or porous single layer stretched films or porous materials based on thermoplastic resins such as polyolefin or polyester Multi-layer stretched film (for example, synthetic paper) and the like, and a laminate obtained by laminating and sticking these films to each other and other films and / or papers, and the like are appropriately used.

The substrate surface layer (substrate on the receiving layer side) of the support is not particularly limited, but a thermoplastic resin such as polyolefin or polyester is used from the viewpoint of the uniformity and gradation of the printed image. A porous single layer stretched film or a porous multilayer stretched film (for example, synthetic paper) as a main component is preferably used.
Furthermore, in order to prevent static electricity and improve whiteness, it is also possible to provide a coating layer containing various known conductive agents, white pigments, fluorescent dyes, etc. between the sheet-like support and the receiving layer. .

  In the present invention, among the above sheet-like supports, papers mainly composed of cellulose pulp are advantageous in terms of cost, and the texture of the obtained receiving sheet is close to photographic paper for silver salt photography. Are preferably used. In the case of using a paper support, it is preferable to provide an intermediate layer containing hollow particles on the support. The material and manufacturing method of the hollow particles used in the intermediate layer are not particularly limited, but specifically, as the material for forming the walls of the hollow particles, acrylonitrile, vinylidene chloride, styrene acrylate ester, etc. alone Examples thereof include polymers, copolymers thereof, and homopolymer mixtures thereof. Examples of a method for producing these hollow particles include a method of encapsulating butane gas in resin particles and heating and foaming, an emulsion polymerization method, and the like.

(Barrier layer)
A barrier layer is preferably provided between the intermediate layer having hollow particles and the receiving layer. Generally, as the solvent of the coating solution for the receiving layer, an organic solvent such as toluene or methyl ethyl ketone is used. Therefore, the barrier layer is formed by deformation of the hollow particles due to swelling and dissolution of the hollow particles in the intermediate layer due to penetration of the organic solvent. It is effective as a barrier to prevent destruction.

  As the resin used for the barrier layer, a resin having excellent film forming ability, preventing permeation of an organic solvent, and having elasticity and flexibility is used. Specifically, starch, modified starch, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy modified polyvinyl alcohol, acetoacetyl group modified polyvinyl alcohol, dith Isobutylene-maleic anhydride copolymer salt, styrene-maleic anhydride copolymer salt, styrene-acrylic acid copolymer salt, ethylene-acrylic acid copolymer salt, urea resin, urethane resin, melamine resin, amide resin, etc. The water-soluble resin is used. Also, water-dispersible resins such as styrene-butadiene copolymer latex, acrylic ester resin latex, methacrylic ester copolymer latex, ethylene-vinyl acetate copolymer latex, polyester polyurethane ionomer, polyether polyurethane ionomer, etc. Can also be used. Among the above resins, water-soluble resins are preferably used. Moreover, said resin may be used independently or may use 2 or more types together.

  Furthermore, the barrier layer may contain various pigments, preferably a swellable inorganic layered compound is used, which is excellent not only in preventing penetration of the coating solvent but also in preventing blurring of the thermal transfer dyed image. An effect is obtained. Examples of the swellable inorganic layered compound include synthetic mica such as fluorine phlogopite, potassium tetrasilicon mica, sodium tetrasilicon mica, sodium teniolite, lithium teniolite, or sodium hectorite, lithium hectorite, saponite, etc. Smectite is more preferably used. Among these, sodium tetrasilicon mica is particularly preferable, and a desired particle size, aspect ratio, and crystallinity can be obtained by a fusion synthesis method.

(Back layer)
In the receiving sheet of the present invention, on the surface (back surface) opposite to the receiving layer, the running property is improved, the static electricity is prevented, the receiving layer is prevented from being damaged by rubbing between the receiving sheets, and the printed receiving sheet is stacked. In some cases, a back layer may be formed for the purpose of preventing dye transfer from the receiving layer to the back surface of the receiving sheet adjacent to the receiving layer. A resin as an adhesive component and various conductive agents can be added to the back layer for antistatic treatment. As the conductive agent, it is preferable to use a cationic polymer. As the cationic polymer, polyethyleneimine, an acrylic polymer containing a cationic monomer, a cation-modified acrylamide polymer, a cationic starch, or the like can be generally used.

  In the present invention, the receiving sheet may be calendered, and the receiving layer surface unevenness can be reduced and smoothed. For example, when paper is used as the support, the calendering process may be performed at any stage after coating the intermediate layer, the barrier layer, or the receiving layer. There are no particular limitations on the calendar device used for the calendar process, the nip pressure, the number of nips, the surface temperature of the metal roll, etc., but the pressure condition when performing the calendar process is preferably 0.5 to 50 MPa. More preferably, it is 1-30 MPa. As for temperature conditions, 20-150 degreeC is preferable, More preferably, it is 30-130 degreeC. As the calendar device, for example, a calendar device generally used in the paper industry such as a super calendar, a soft calendar, a gloss calendar, a clearance calendar, and the like can be appropriately used.

The present invention will be described in more detail with reference to the following examples, but the present invention is of course not limited thereto. Unless otherwise specified, “parts” and “%” in the examples all represent “parts by mass” and “% by mass”, and are solid amounts except for those relating to solvents.
"Manufacture of polyester resin"
Each polyester resin (emulsion) was synthesize | combined by the well-known method using the polyhydric carboxylic acid component and polyhydric alcohol component which are shown in following Table 1.

実施例１
「中間層の形成」
シート状支持体として、厚さ１５０μｍのアート紙（商品名：ＯＫ金藤Ｎ、１７４．４ｇ／ｍ^２、王子製紙製）を使用し、その片面に下記組成の中間層用塗工液−１を、乾燥後の膜厚が５１μｍになるように塗工、乾燥して中間層を形成した。
中間層用塗工液−１
アクリロニトリル及びメタクリロニトリルを主成分とする共重合体からなる既発泡中空粒子（平均粒子径３．２μｍ、体積中空率７６％） ５０部
ポリビニルアルコール（商品名：ＰＶＡ２０５、クラレ製） １０部
スチレン−ブタジエンラテックス（商品名：ＰＴ１００４、日本ゼオン製） ４０部
水 ２５０部

Example 1
"Formation of an intermediate layer"
As a sheet-like support, art paper (trade name: OK Kanto N, 174.4 g / m ² , made by Oji Paper Co., Ltd.) having a thickness of 150 μm is used, and an intermediate layer coating liquid-1 having the following composition is applied on one side thereof. The intermediate layer was formed by coating and drying so that the film thickness after drying was 51 μm.
Intermediate layer coating solution-1
Pre-expanded hollow particles (average particle diameter 3.2 μm, volume hollow ratio 76%) made of a copolymer mainly composed of acrylonitrile and methacrylonitrile 50 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) 10 parts styrene Butadiene latex (trade name: PT1004, manufactured by Nippon Zeon) 40 parts Water 250 parts

"Formation of barrier and receptor layers"
Furthermore, the barrier layer coating liquid-1 having the following composition was applied on the intermediate layer so as to have a solid content coating amount of 2 g / m ² and dried to form a barrier layer. Then, the receiving layer coating liquid-A having the following composition was coated and dried so that the solid coating amount was 5 g / m ² to form a receiving layer.
Coating liquid for barrier layer-1
Swellable inorganic layered compound (sodium 4 silicon mica, particle average major axis 6.3 μm, aspect ratio 2700) 30 parts polyvinyl alcohol (trade name: PVA105, manufactured by Kuraray) 50 parts styrene-butadiene latex (trade name: L-1537, Asahi Kasei) Made) 20 parts water 1100 parts Receptive layer coating liquid-A
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C.) 20 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

"Formation of back layer"
Next, on the surface of the sheet-like support opposite to the side on which the receiving layer is provided, the back layer coating solution-1 having the following composition is applied so that the solid coating amount after drying is 3 g / m ^2. Coating and drying were carried out to form a back layer, followed by heat treatment at 50 ° C. for 4 days. Further, calendering (roll surface temperature 78 ° C., nip pressure 2.5 MPa) was performed to smooth the surface of the sheet-like support on which each coating layer was formed.
Back layer coating solution-1
Polyvinyl acetal resin (trade name: ESREC KX-1, manufactured by Sekisui Chemical Co., Ltd.) 40 parts Polyacrylic acid ester resin (trade name: Jurimer AT613, manufactured by Nippon Pure Chemical) 20 parts nylon resin particles (trade name: MW330, Shinto Paint) 10 parts zinc stearate (trade name: Z-7-30, manufactured by Chukyo Yushi) 10 parts cationic conductive resin (trade name: Chemistat 9800, manufactured by Sanyo Kasei) 20 parts water / isopropyl alcohol = 2/3 ( (Mass ratio) 400 parts of liquid mixture

"Formation of an overcoat layer"
Further, an overcoat layer coating solution-1 having the following composition was applied onto the receiving layer of the sheet-like support so that the solid content was 3 mg / m ² and dried to form an overcoat layer. Then, a receiving sheet was created.
Overcoat layer coating solution-1
Silicone graft acrylic resin (trade name: X22-8053,
Shin-Etsu Chemical Co., Ltd.) 1 part Isopropanol 100 parts

Example 2
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-B was used instead of the receiving layer coating solution-A.
Receiving layer coating solution-B
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo Sticker 700, manufactured by Nikka Chemical,
Glass transition temperature: −40 ° C.) 20 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 3
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-C was used instead of the receiving layer coating solution-A.
Receiving layer coating liquid-C
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo Sticker 1700, manufactured by Nikka Chemical,
Glass transition temperature: 20 ° C.) 20 parts polyisocyanate (trade name: NK Assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 4
A receiving sheet was prepared in the same manner as in Example 1 except that the polyester resin emulsion B was used in place of the polyester resin emulsion A in the receiving layer coating solution-A of Example 1.

Example 5
A receiving sheet was prepared in the same manner as in Example 1 except that the polyester resin emulsion C was used in place of the polyester resin emulsion A in the coating liquid for receiving layer A of Example 1.

Example 6
In the formation of the overcoat layer of Example 1, the same procedure as in Example 1 was performed except that the overcoat layer was formed by coating and drying so that the solid coating amount of the overcoat layer was 15 mg / m ^2. To make a receiving sheet.

Example 7
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-D was used instead of the receiving layer coating solution-A.
Receptive layer coating liquid-D
Polyester resin emulsion A 80 parts urethane resin (trade name: Evaphanol APC-55, manufactured by Nikka Chemical,
Glass transition temperature: −50 ° C.) 20 parts polyisocyanate (trade name: NK Assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 8
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-E was used instead of the receiving layer coating solution-A.
Receiving layer coating liquid-E
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo Sticker 5500, manufactured by Nikka Chemical,
Glass transition temperature: 40 ° C.) 20 parts polyisocyanate (trade name: NK Assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 9
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-F was used instead of the receiving layer coating solution-A.
Receiving layer coating solution-F
Polyester resin emulsion A 60 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C.) 40 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 10
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-G was used instead of the receiving layer coating solution-A.
Receiving layer coating liquid-G
Polyester resin emulsion A 40 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C.) 60 parts polyisocyanate (trade name: NK Assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 11
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-H was used instead of the receiving layer coating solution-A.
Receptive layer coating liquid-H
Polyester resin emulsion A 95 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C.) 5 parts polyisocyanate (trade name: NK Assist IS-70S, manufactured by Nikka Chemical) 2 parts

Example 12
In the formation of the overcoat layer of Example 1, it was the same as Example 1 except that the overcoat layer was formed by coating and drying so that the solid coating amount of the overcoat layer was 1 mg / m ^2. To make a receiving sheet.

Example 13
In the formation of the overcoat layer of Example 1, it was the same as Example 1 except that the overcoat layer was formed by coating and drying so that the solid coating amount of the overcoat layer was 25 mg / m ^2. To make a receiving sheet.
Example 14
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-I was used instead of the receiving layer coating solution-A.
Receptive layer coating liquid-I
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C.) 20 parts 3-glycidoxypropyltrimethoxysilane (trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.)
0.5 part Example 15
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-J was used instead of the receiving layer coating solution-A.
Receiving layer coating liquid-J
Polyester resin emulsion A 80 parts urethane resin (trade name: Neo sticker 1200, manufactured by Nikka Chemical,
Glass transition temperature: −20 ° C. 20 parts hydrolyzable alkoxysilyl group and epoxy group-containing vinyl copolymer resin (trade name: WSA-950, manufactured by Dainippon Ink and Chemicals) 8 parts

Comparative Example 1
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-K was used instead of the receiving layer coating solution-A.
Receptive layer coating liquid-K
Polyester resin emulsion D 65 parts urethane resin (trade name: Neo Sticker 1700, manufactured by Nikka Chemical,
Glass transition temperature: 20 ° C.) 45 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

Comparative Example 2
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-L was used instead of the receiving layer coating solution-A.
Receiving layer coating liquid-L
Polyester resin emulsion E 65 parts urethane resin (trade name: Neo Sticker 1700, manufactured by Nikka Chemical,
Glass transition temperature: 20 ° C.) 45 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

Comparative Example 3
A receiving sheet was prepared in the same manner as in Example 1 except that the receiving layer coating solution-M was used instead of the receiving layer coating solution-A.
Receptive layer coating liquid-M
Polyester resin emulsion F 65 parts urethane resin (trade name: Neo Sticker 1700, manufactured by Nikka Chemical,
Glass transition temperature: 20 ° C.) 45 parts polyisocyanate (trade name: NK assist IS-70S, manufactured by Nikka Chemical) 2 parts

Comparative Example 4
A receiving sheet was prepared in the same manner as in Comparative Example 1 except that the formation of the overcoat layer (Example 1) was omitted.

Evaluation The following tests were conducted on the receiving sheets obtained in the above Examples and Comparative Examples. The obtained results are shown in Table 2.

(Print density test)
Using the commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) on the obtained receiving sheet, 20 ° C. A black solid image was printed under an environment, and the print density was measured using a reflection densitometer (trade name: Macbeth RD-914, manufactured by Gretag). When the printing density is measured at five points and the average value thereof is a density of 2.1 or more, it is at a level where there is no practical problem.

(Light resistance test)
The printed matter was processed with an Xe fade meter until the accumulated illuminance reached 10,000 kJ / m ² . Based on JIS Z8721, it measured using the color difference meter (Gretag company). The measured values were recorded in the L * a * b * color system based on JIS Z 8729, and the color difference (ΔE) before and after processing was calculated by a method based on JIS Z 8730. If the color difference is 13 or less, it is a level with no practical problem.

[Ink ribbon peelability test]
Using the commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) on the obtained receiving sheet, 50 ° C. Under the environment, 10 black solid images were printed continuously. At that time, the fusing state between the receiving sheet surface and the ink ribbon as the printability, the discharge property of the receiving sheet from the printer, and the like were evaluated according to the following criteria, and the ribbon peelability is shown in Table 2.
A: There is no fusion between the surface of the receiving sheet and the ink ribbon, 100 sheets are normally discharged continuously, and there is no problem in practical use even in a high temperature environment.
A: There is no fusion between the receiving sheet surface and the ink ribbon, and 10 sheets are normally discharged continuously, and there is no problem in practical use.
Δ: Some noise is caused by light fusion between the receiving sheet surface and the ink ribbon, but all 10 sheets are discharged and are practical.
X: The receiving sheet surface and the ink ribbon are fused, and there are some which are not normally discharged, which is not suitable for practical use.

[Protective layer transferability test]
On the receiving layer of the obtained receiving sheet, a thermal transfer tester (trade name: TH-PMI2, manufactured by Okura Electric Co., Ltd.) was used to vary the applied energy, and a sublimation thermal transfer ink ribbon (trade name: UP- 540, manufactured by Sony Corporation) was transferred, and the minimum energy that the protective layer could transfer was determined. In this protective layer transferability test, if the minimum protective layer transfer energy is 1 mJ / dot or less, the transferability level has no practical problem.

  The receiving sheet of the present invention is excellent in protective layer transferability and peelability from the ink ribbon, has a high printing density, and is excellent in light resistance of images, and is suitable for various color transfer printers such as a sublimation thermal transfer method. It is useful and greatly contributes to the industry.

Claims (5)

  In a thermal transfer receiving sheet having a sheet-like support and an image receiving layer formed on at least one surface of the sheet-like support, the image receiving layer contains 75 mol% or more of all the polyvalent carboxylic acid components. A polyester resin obtained by polycondensation of a polyhydric carboxylic acid component and a polyhydric alcohol component mainly composed of an aliphatic polyhydric alcohol and / or an alicyclic polyhydric alcohol, and a urethane resin. Thermal transfer receiving sheet.   The thermal transfer receiving sheet according to claim 1, wherein a mass ratio of the content of the polyester resin and the urethane resin is 40/60 to 95/5.   The thermal transfer receiving sheet according to claim 1 or 2, wherein the polyester resin has a glass transition temperature of 30 to 90 ° C, and the urethane resin has a glass transition temperature of -50 to 40 ° C. The image receiving layer further comprises an overcoat layer containing a silicone graft copolymer resin, and the coating amount of the overcoat layer is 1 to 25 mg / m ² . Thermal transfer receiving sheet.   The thermal transfer receiving sheet according to any one of claims 1 to 4, wherein the image receiving layer is crosslinked with a compound having both a hydrolyzable alkoxysilyl group and an epoxy group in one molecule.