JPS63307988A - Image-receiving sheet for thermal transfer recording - Google Patents

Abstract

PURPOSE:To prevent curling from occurring at the time of thermal transfer, by using a polypropylene synthetic paper having a multiplicity of minute voids in a film as a base, and providing a graft copolymer resin of alpha, beta-unsaturated carboxylic acid or anhydride thereof having a predetermined Young's modulus as an intermediate layer between the base and a dyeable resin layer. CONSTITUTION:A polypropylene synthetic paper having a multiplicity of minute voids in a film and used as a base 1 is produced by extrusing a composition having a polypropylene resin as a main constituent ind comprising an inorganic fine powder in a film form, and subjecting the extrudate to cold stretching or hot stretching. An intermediate layer 2 is constituted of a resin obtained by graft polymerization of alpha, beta-unsaturated carboxylic aid or anhydride thereof onto a covalent bond crosslinked type elastomer or a thermoplastic elastomer, the polymer containing 0.05-10 wt.% of the alpha, beta-unsaturated carboxylic acid. The material for forming the intermediate layer 2 has a Young's modulus of 1-2000kg/cm<2>. The dyable resin layer 3 is constituted of a material which is sufficiently dyeable with sublimable dyes, for example, a thermoplastic polyester resin or an epoxy resin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an image receiving sheet used in a recording method that obtains an image from an electrical image signal by thermal sublimation transfer.

(Prior art) Among thermal transfer recording methods, the sublimation transfer method, which uses sublimable dyes, has excellent gradation and can output color images for personal computers, televisions, VTRs, video discs, etc. as still images. Most suitable for full color printers.

This image quality greatly affects the quality of the image-receiving sheet, and synthetic paper made from synthetic polymers has better image quality than general paper made from cellulose, such as high-quality paper, art paper, and coated paper. give. Among them, polypropylene synthetic paper obtained by stretching a polypropylene film containing fine inorganic powder and bonding it by forming many fine pores (voids) inside the film [for example, product names: Yubo, Tamago Yukasei] Made of paper] has excellent water resistance, paper feeding and ejection properties, and due to the presence of voids, it has excellent cushioning properties and excellent contact with the head.
Gives good image quality.

However, this polypropylene synthetic paper has a soft feel, good adhesion to the print head, and good paper feeding/discharging properties, so the film is stretched at a temperature lower than the melting point of the polyolefin material (for example, the melting point is 164°C). In the case of homopolypropylene of ~166°C, the stretching temperature is 150~161°C) to form microvoids inside.

However, polyolefin has a low heat resistance of 167°C or less compared to polyethylene terephthalate and polyamide (240-255°C), and when printing with a print head, the surface temperature of the receiving sheet is higher than the stretching temperature.
It has been pointed out that the heat generated during printing causes the synthetic paper to shrink, causing the heat-sensitive transfer receiving sheet to curl on the printed inner surface (4I!
F Kaisho No. 60-245593, No. 61-283595).

As a method to solve such problems, Japanese Patent Application Laid-Open No. 61-258
Publication No. 793 proposes to prevent curling by providing an intermediate layer having rubber elasticity with a Young's modulus of 10S to 1 G'dyne/- between the dyed resin layer and the synthetic paper base material. . However, the material for these intermediate layers with rubber elasticity must have sufficient adhesion to both the synthetic paper base material made of polypropylene and the dyed resin layer made of polyester resin, epoxy resin, polyamide resin, acrylic resin, etc. There was no practical problem.

(Problems to be solved by the invention) Therefore, in the present invention, while taking advantage of the advantages of synthetic paper,
The purpose of this invention is to eliminate the above-mentioned curling disadvantage that occurs when synthetic paper is used as a base material for an image-receiving sheet.

(Means for Solving the Problems) The present invention provides an image receiving sheet for thermal transfer recording that is transferred by heating from a thermal transfer paper containing a sublimable dye, in which a large number of fine voids are formed inside the film as a base material. When using a polypropylene synthetic paper having a Young's modulus (JISP-8132) of 1 to 2.00 between the dyeing resin layer and the base material
By providing a resin obtained by graft copolymerizing α, β-unsaturated carboxylic acid or its anhydride as an intermediate layer, curling during heat transfer is prevented, and synthetic paper The object of the present invention is to provide a practically useful scratched sheet for sublimation heat-sensitive transfer recording, which has sufficient adhesion between the base material, intermediate layer, and dyed resin layer.

(Structure of the Invention) The scratched sheet (A) for sublimation thermal transfer recording of the present invention basically comprises a base material (1), an intermediate layer (2), and a dyed resin layer (3) as shown in FIG. It consists of a three-layer structure.

Polypropylene synthetic paper, which has many fine voids inside the film of the base material (1), falls into the former category when divided into film method synthetic paper and fiber method synthetic paper, which are known methods of manufacturing synthetic paper. It is produced by extruding a composition containing polypropylene resin as a main component into a film through a slit in a die, and then cold-stretching or hot-stretching it (% Kosho 46-40794,
JP 60-245593, JP 61-1) 2693). This synthetic paper is called an internal paper type, and voids are formed inside the film.

Such polypropylene synthetic paper is commercially available, for example, from Tamago Yuka Synthetic Paper (2) under the trade name Yubo.

The synthetic paper used as the base material has a wall thickness of 40 to 300 microns, preferably 100 to 200 microns.

As the intermediate layer (2), a resin obtained by graft copolymerization of α,β-unsaturated carboxylic acid or its anhydride is used.

As the resin before graft copolymerization with the α,β-unsaturated carboxylic acid or its anhydride, a substance generally said to have rubber elasticity is used. Specifically, examples include covalently crosslinked elastomers called vulcanized rubbers, thermoplastic elastomers that can be plasticized at high temperatures and molded using plastic processing machines, and some thermoplastic plastics with low elastic modulus. Among these, thermoplastic elastomers require both a rubber component that has entropic elasticity in the molecule and a molecular restraint component that prevents plastic deformation.
Molecular restraint components include those based on the frozen phase of styrene, those based on the crystalline phase of olefins, esters, etc., those based on hydrogen bonds such as urethane, and those based on ionic crosslinking such as acrylic. A resin obtained by graft polymerizing αtβ-unsaturated carboxylic acid or its anhydride in the presence of a radical polymerization initiator using these resins as raw materials is used as the intermediate layer.

The graft polymerization method involves melt-kneading using an extruder,
A radical polymerization method or a method in which the raw material resin is dispersed in an aromatic hydrocarbon solvent such as toluene, xylene, chlorobenzene, or benzene in which a radical polymerization initiator is dissolved, and α,β-unsaturated carboxylic acid or its acid anhydride is added to the resin. A good method is to supply a substance and heat it to cause radical polymerization.

As the α,β-unsaturated carboxylic acid or its acid anhydride, acrylic acid, methacrylic acid, maleic acid, itaconic acid, citraconic acid, crotonic acid, fumaric acid, and maleic anhydride are used. Moreover, when it is a polybasic acid such as maleic acid or fumaric acid, its bar 7 alkyl ester may be used.

Acrylonitrile, acrylamide, vinyl chloride, 2 with α, β-unsaturated carboxylic acid or its anhydride with
- Other vinyl monomers such as hydroxyethyl acrylate may be used in combination.

Since the graft polymer obtained by radical polymerization contains unreacted α,β-unsaturated carboxylic acid or its acid anhydride, it is preferable to repeatedly wash the graft polymer with toluene or acetone. After washing, dry under reduced pressure to remove acetone.

The radical polymerization initiator may be any conventional radical initiator, including organic peroxides, azonitrile, and the like. Organic peroxides include alkyl peroxides, aryl peroxides, acyl peroxides, aroyl peroxides, ketone peroxides, peroxycarbonates, peroxycarbonates, and the like.

Alkyl peroxides include dibenzoyl peroxide, ditertiary butyl peroxide, and tertiary butyl hydroperoxide; aryl peroxides include dicumyl peroxide, cumyl hydroperoxide,
Examples of the acyl peroxide include dilauroyl peroxide, examples of the aroyl peroxide include dibenzoyl peroxide, and examples of the ketone peroxide include methyl nibble ketone peroxide and cyclohexanone peroxide. Examples of azonitrile include azobisisobutyronitrile and azobisinpropionitrile.

In the thus obtained graft polymer, in the polymer,
Contains α,β-unsaturated carboxylic acid in a proportion of 0.05 to 10% by weight. If this content is less than 0.05% by weight, the adhesion with the dyeing resin layer will be poor9, and if it exceeds xoli %, the adhesion with the polypropylene synthetic paper substrate will be insufficient.

Further, this graft copolymer may be diluted with the above-mentioned raw material resin before graft polymerization.

Furthermore, when used as an intermediate layer, conventionally known inorganic vulcanizing agents, organic vulcanizing agents, vulcanization accelerators, activators,
Anti-aging agent, wire 9 accelerator, softener, reinforcing agent, filler,
Resins and the like can be added at appropriate times and in appropriate amounts to adjust processability, heat resistance, elasticity, weather resistance, strength, etc.

In addition, the material for forming the intermediate layer (2) has a Young's modulus of 1.
~2.000#/- is required.

If a material with a Young's modulus of less than 1 kg/cd is used as an intermediate layer, the intermediate layer itself will be distorted by the heating and pressure applied by the thermal head during printing and will not recover, resulting in unevenness on the surface of the thermal transfer image-receiving paper and a noticeable gloss. This results in a decrease in on the other hand,
If a material with a Young's modulus exceeding 2,000 kl/al is used as the intermediate layer, curling of the image-receiving sheet during thermal transfer cannot be prevented.

The above-mentioned graft copolymer of the intermediate layer forming material is dissolved in an appropriate organic solvent, or after adjusting it to an appropriate viscosity as a lubricant or emulsion liquid, using a roll coater, kiss coater, etc.
It is coated and dried using any coating means such as a gravure coater. Furthermore, for thermoplastic materials, extrusion coating such as Accumator can also be used. In addition, the thickness of this intermediate layer is about 1 to 200 f/g/, preferably 5 to 30 f/, yl in terms of dry coating amount, and if it is less than lt/-, there is no sufficient curl prevention effect, so the upper limit is mainly The decision will be made based on economic efficiency.

Next, as the dyeing resin layer (3), a wide variety of materials can be used as long as they have sufficient dyeability for sublimation dyes, such as thermoplastic polyester resin, epoxy resin, polyamide resin, acetic acid resin, etc. Examples include cellulose resin, polyvinyl butyral resin, and acrylic resin. These dyeing resin layers may contain release substances such as solid waxes, fluorine-based or phosphate ester-based surfactants, and silicone oils to prevent fusion with the thermal transfer paper. good. In addition, if necessary, inorganic fine particles such as silica, calcium carbonate, and titanium fermentation may be contained, or the dyeing resin may be partially crosslinked (effects of the invention). By providing a resin obtained by graft copolymerizing a cocoon, α, β-unsaturated carboxylic acid or its anhydride with a Young's modulus of 1 to 2.000 kf10i between the adhesive resin layers as an intermediate layer, it is possible to It is possible to obtain an extremely useful image-receiving sheet for sublimation heat-sensitive transfer that does not curl and has excellent adhesion between the synthetic paper base material, intermediate layer, and dyed resin layer.

(Examples, etc.) Below, resin production examples, examples, and comparative examples will be described in further detail. The “part” mentioned in these examples is “
Parts by weight.

Resin production example 1 In a stainless steel pressure-resistant reaction vessel equipped with a thermometer and a stirrer, 1 ton of xylene and Shell Chemical's hydrogenated styrene-butadiene-styrene block copolymer "Krayton G-16" were placed.
100t of 52" was charged, the system was replaced with nitrogen gas, and 12"
After raising the temperature to 5°C, a xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (
Maleic anhydride (dicumyl peroxide 1 r/x Qid, dicumyl peroxide o, 1 sr/x od) was fed over 6 hours from separate conduits, and finally maleic anhydride 6.0 IP, dicumyl peroxide 0.9 F was supplied into the system. After the reaction is completed, the system is cooled to around room temperature, acetone is added, the maleic anhydride grafted block copolymer is taken out of the furnace, and the precipitate is washed repeatedly with acetone. The washed precipitate was dried under reduced pressure at an elevated temperature to obtain modified resin I in the form of a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was found to be 3.4% by weight. Further, when the Young's modulus of this modified resin was measured, it was 130#/-.

Resin production example 2 In a stainless steel pressure-resistant reaction vessel equipped with a thermometer and a stirrer, 1t1 of xylene and 1t1 of hydrogenated styrene-in-prene block copolymer "Kraton GX-1701" from Shikuru Chemical Co., Ltd.
After charging 00f, purging the system with nitrogen gas, and raising the temperature to 125°C, a xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (maleic anhydride: 1f/xo*, dicumyl peroxide 0.15
f/101) I) was supplied from separate conduits over a period of 6 hours, and finally 6.01 F of maleic anhydride and 0.9 t of dicumyl peroxide were supplied into the system. After the reaction is completed, the system is cooled to around room temperature, acetone is added, the maleic anhydride grafted block copolymer is taken out of the furnace, and the precipitate is washed repeatedly with acetone. The washed precipitate was dried under reduced pressure at an elevated temperature to obtain modified resin (2) as a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was determined to be 3.8% by weight. In addition, the Young's modulus of this modified resin is 10 oil/-
I failed.

Resin production example 3 In a stainless steel pressure-resistant reaction vessel equipped with a thermometer and a stirrer, 1 t of xylene, 1 t of hydrogenated styrene, 1 butadiene block copolymer and hydrogenated styrene-butadiene block copolymer from Shell Chemical Co. It is a mixture of coalescence (weight ratio V7
) "Kraton GX-1726" 100f was charged, the inside of the system was replaced with nitrogen gas, the temperature was raised to 125°C, and then a xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (maleic anhydride: ir/10
iu, dicumyl peroxide 0.15 f 710 m
) is fed from separate conduits over a period of 6 hours, and finally maleic anhydride 6. After the completion of the reaction, the system was cooled to around room temperature, and acetone was added to remove the maleic anhydride grafted block copolymer, followed by repeated precipitation with acetone. Wash. The washed precipitate was dried under reduced pressure to obtain a modified resin (2) in the form of a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was determined to be 3.7 weight. Further, the Young's modulus of this modified resin was 1) 0I&/-.

Resin production example 4 In a pressure-resistant stainless steel reactor, Schiff tetrahexane 7500
f, 25% triethyl aluminum 660f (1,4
5 mol), 128 t of dry nickel acetate (0,75
100 mol) under 1 sopsig H2 pressure.
Heated at ~130°C for 30 minutes.

After cooling, the Hesterene/Inogren block copolymer is heated in the reactor.
071 (Shell Chemical Exhibition; Product Name) 22800f and 25
% triethylaluminum 5Qf and gradually added 2% triethylaluminum 5Qf while maintaining a pressure of 1000 psig with vigorous stirring.
Heated to 00°C.

It was kept at 200°C for 1.5 hours.

Next, it was cooled to 40°C, the balls were released, and Hz purge was performed. Next, the τ hydrogenation product was made into a slurry using Celite filter aid 300F, and the product was collected in a furnace. The product was thoroughly washed with acetone and dried.

When this hydrogenated product was sampled and measured by iodine number analysis and infrared absorption spectrum analysis, it was found that all olefinic unsaturated bonds were hydrogenated and did not exist, and that the aromatic unsaturated bonds in the styrene moiety were not hydrogenated. I found out that there isn't.

Next, in a stainless steel pressure-resistant reactor equipped with a thermometer and a stirrer, 1 ton of xylene and 100% of the above hydrogenated styrene-inoprene-styrene block copolymer were added. After charging, replacing the system with N2 gas, and raising the temperature to 125°C,
A xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (maleic anhydride: x
y/1od.

Dicumyl peroxide o,
Of, 0.92 of dicumyl peroxide was supplied into the system. After the reaction was completed, the system was cooled to around room temperature, acetone was added, and the maleic anhydride grafted block copolymer was removed from the furnace.
Further wash the precipitate repeatedly with acetone. The washed precipitate was dried under reduced pressure at an elevated temperature to obtain modified resin V in the form of a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was determined to be 3.6% by weight. Further, when the Young's modulus of this modified resin was measured, it was 160 #/ai.

Resin production example 5 A stainless steel pressure-resistant reactor with a thermometer and a stirrer,
Xylene IL and hydrogenated styrene-inoprene-styrene block copolymer 100F before being graft-modified with maleic anhydride from Resin Production Example 4 were charged, the system was replaced with nitrogen gas, the temperature was raised to 125°C, and then the pump A xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (maleic anhydride: 4 t/1a1
)1. Dicumyl peroxide 0.31F/10d) was fed from separate conduits over 6 hours, and finally maleic anhydride 50t1 dicumyl peroxide 4. of was supplied into the system. After the reaction is completed, the system is cooled to around room temperature, acetone is added, the maleic anhydride grafted block copolymer is taken out of the furnace, and the precipitate is washed repeatedly with acetone. The washed precipitate was dried under reduced pressure at an elevated temperature to obtain modified resin V in the form of a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was found to be 15.5 fold. Further, the Young's modulus of this modified resin was 180#/-.

Resin production example 6 A stainless steel pressure-resistant reactor trap equipped with a thermometer and a stirrer,
1 ton of xylene and 10 liters of ethylene-propylene copolymer rubber "EP02P" (trade name, manufactured by Japan Synthetic Rubber Company)
After charging 02 and purging the system with nitrogen gas and raising the temperature to 125°C, a xylene solution of maleic anhydride and a xylene solution of dicumyl peroxide (maleic anhydride: 1P/10m, dicumyl peroxide 0.1 s
t/l.

d) is fed through separate conduits over a period of 6 hours, and finally maleic anhydride 6. Of, 0.92 of dicumyl peroxide was supplied into the system. After the reaction is completed, the system is cooled to around room temperature,
After adding acetone to remove the maleic anhydride graft block copolymer, the precipitate is washed repeatedly with acetone.

The washed precipitate was dried under reduced pressure at an elevated temperature to obtain a modified resin (2) in the form of a white powder. As a result of infrared absorption spectrum measurement and neutralization titration of this modified resin, the content of maleic anhydride groups was 4.8% by weight. Further, the Young's modulus of this modified resin was 231#/-.

Resin production example 7 Commercially available chlorinated polypropylene (Toyo Kasei Kogyo ■Product name “
Bardren 15LP'', combined chlorine content 30%) 100 parts,
10 parts of maleic anhydride and 300 parts of chlorobenzene were placed in a reaction apparatus equipped with a reflux tube, and 1) after heating and dissolving at 0°C, 4 parts of benzoyl peroxide was added over 6 hours, and after that addition, the mixture was further heated at the same temperature. The reaction was stirred for 3 hours.

After the reaction was completed, chlorobenzene and unreacted maleic anhydride were distilled off, first at normal pressure and then at 140° C. under reduced pressure for one day.

The obtained maleic anhydride-added polypropylene chloride [
The maleic anhydride content in Resin (1) was 3.5%, and the amount of bound chlorine was 27.5%. Further, the Young's modulus of this modified resin was s, so kg/cd.

Resin ■ The above-mentioned "Krayton G-1652' was used alone (Resin ■). Young's modulus was 12 kg/-.

Resin ■ The above-mentioned “Krayton GX-1726” was used alone (
Resin ■). Young's modulus was 100 kg/-.

Resin X The above-mentioned “Krayton GX-1701” was used alone
Resin X). Young's modulus was 90#/m.

Resin X The above-mentioned 1Califlex TR-1) 071 was used alone (Resin M). Young's modulus was 140 Ay/clI.

Examples 1 to 5, Comparative Examples 1 to 6, Reference Example 1 Each resin ① to X obtained in the above resin production example was dissolved in toluene,
Each was diluted to give a coating agent with a solid content concentration of 10% by weight.

Each of the obtained coating agents was applied to polypropylene synthetic paper (manufactured by Tamago Yuka Synthetic Paper Co., Ltd.; trade name: Yubo FPG) with a thickness of 175 μm.
-175) with a dry weight of about 8 f/lr? Apply with a bar coater so that
By drying for 1 hour, it was used as an intermediate layer in the present invention.

Next, using the synthetic paper on which the intermediate layer was formed and the uncoated synthetic paper, 20 parts of a saturated polyester resin (Vylon ÷ 2001, trade name manufactured by Toyobo Co., Ltd.) and a polyisocyanate compound (
A dyeing resin solution consisting of 3 parts of Coronate L1 (trade name manufactured by Nippon Polyurethane Co., Ltd.) and 77 parts of methyl ethyl ketone was coated on the above intermediate layer or synthetic paper using a percoater so that the dry coating amount was 82 parts, and then dried with hot air. 90℃ depending on the machine
The mixture was dried for 1 hour at 50° C. and further aged for 12 hours to prepare an image-receiving sheet for sublimation heat-sensitive transfer recording.

The following tests were conducted and evaluated using the sheets coated with only the intermediate layer and the image receiving sheet coated with the dyed resin layer, before the dyed resin layer was coated.
Shown in the table.

(Test method and evaluation method) (1) Adhesiveness ① Adhesion between base material and middle glabella A sheet coated only with an intermediate layer without a dyed resin layer is used. 1) Draw a line reaching the material at 1fi intervals vertically and horizontally using a cutter knife, and apply cellophane tape to the 100 (denominator) squares that were created. - When carefully peeled off, the coating film will peel off. Number of squares that remained (numerator)
It was evaluated by

Evaluation criteria: 100/100 (Q, excellent), 99/100
~90/100 (Δ, acceptable), 89/100 ~ 60/10
0 (X, poor), 59/loo to O/1oo (xx, extremely poor).

(2) Adhesiveness between intermediate skin and dyed resin layer Using an image-receiving sheet in which a dyed resin layer was further coated on the intermediate layer, tests and evaluations were made in exactly the same manner as in (2).

(2) Image quality of the transferred image Using an image receiving sheet coated with a dyed resin layer, the image of the same pattern is transferred to the Hitachi color video printer VY-50, and the transferred image has no sharpness, uneven color, or white spots. The image quality was visually evaluated.

The evaluation criteria are: O: Very good, Δ: No problems for actual river use, ×;
Slightly uneven color, some white spots, ××; Color 2, large white spots.

(3) After the transferred image-receiving sheet used for image quality evaluation of the transferred image with curl height 2 was left in a constant temperature room at 23°C and 50% RH for 24 hours, the lifting and height of the west end of the image-receiving sheet were confirmed. The average value of h (Figure 2) is expressed numerically (unit: ■).

[Brief explanation of drawings]

FIG. 1 is a sectional view of an image-receiving sheet according to the present invention, and FIG. 2 is an explanatory diagram for explaining a method for measuring curl height. In the figure, (1) is the synthetic paper base material, 01) is the intermediate material, 1, (ii
) is a dyed resin layer. Further, ``person'' represents the image receiving sheet after thermal transfer, ``B'' represents the horizontal surface (horizontal plate), and ``h'' represents the curl height.

Claims (4)

[Claims] (1) As a base material in an image receiving sheet for thermal transfer recording consisting of a base material transferred by heating from a heat-sensitive transfer paper having a color material layer containing a sublimable dye, an intermediate layer of an adhesive layer, and a dyed resin layer. A polypropylene synthetic paper having fine voids inside the film is used, and the Young's modulus between the dyeing resin layer and the synthetic paper as the base material is 1 to 2,000 kg/cm^2, and α,β-imbalanced An image-receiving sheet for sublimation heat-sensitive transfer recording, which includes a resin obtained by graft copolymerizing a saturated carboxylic acid or its anhydride as an intermediate layer. (2) The resin before graft copolymerization with α,β-unsaturated carboxylic acid or its anhydride is a styrene/butadiene block copolymer, a styrene/butadiene/styrene block copolymer, or a styrene/isoprene block copolymer. , a styrene-isoprene-styrene block copolymer or its hydrogenated product, or an ethylene-propylene copolymer rubber. ) The image-receiving sheet for sublimation heat-sensitive transfer recording described in item 2. (3) The image-receiving sheet for sublimation thermal transfer recording according to claim (1), wherein the anhydride of α,β-unsaturated carboxylic acid is maleic anhydride. (4) A patent claim in which the concentration of α,β-unsaturated carboxylic acid or its anhydride in the resin graft-copolymerized with α,β-unsaturated carboxylic acid or its anhydride is 0.05 to 10% by weight. An image-receiving sheet for sublimation heat-sensitive transfer recording as described in scope (1).