JPH0810327B2 - Image receiving sheet for thermal transfer with improved transfer density - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image receiving sheet that receives a transfer image from a color material supply sheet by heating, and more specifically, it is transferred from a transfer medium for thermal recording in thermal transfer recording. The present invention relates to a color material and an image-receiving sheet that receives a dye that is released or formed by heat development after exposing a photothermographic material.

[Conventional technology]

Various technologies for obtaining color hard copies from televisions, CRT color displays, magnetic cameras, color facsimiles, etc. have been studied, and impact type and non-impact type printers have been put into practical use as printer types that can easily obtain hard copies. However, as interest in color hard copy has increased in recent years, the non-impact type has come to be mainly used because of the fineness of the recording stylus and the ease of handling.

Non-impact printers include silver salt color films as recording media, optical scanning printers that use electrophotography, inkjet printers that eject ink droplets at high speed to obtain images, and coloring materials that use thermal energy. Thermal transfer printers and the like have been developed which obtain an image by transferring. However, among the silver salt methods, the instant color film has a problem of high running cost, and the wet processing method of the color film has a drawback that it takes a relatively long time for development processing and is not immediate.

On the other hand, the electrophotographic method and the inkjet method have problems such as requiring a complicated device and a low recording speed, and the thermal recording method that can obtain a recorded image at the same time as an input signal is relatively simple and inexpensive. Moreover, because it is low noise,
It has begun to be used in various fields as a facsimile and various terminal printers.

In this thermal recording system, a thermal transfer sheet having a solid color material layer provided on a sheet base material and an image receiving sheet (recording paper) that receives a color material supplied in an imagewise manner are overlapped, and a thermal head, electric heating and other By a heating means, the color material of the color material layer on the substrate is melted or sublimated, and transferred to the image receiving sheet to obtain an image. JP-A Nos. 54-143155, 54-17037, 5
4-62840, 54-32329, 54-121734, 54-8
8135, 54-23545, 54-44799, 55-65590
No. 55-82698, No. 55-65590 and the like.

The thermal recording method is also called the thermal transfer recording method,
A method of making a hard copy using a sublimation dye is expected because it is advantageous in gradation.

On the other hand, in recent years, the demand for pictorial color hard copy has increased, and a heat development transfer method has been proposed in which a high-quality transferred image can be obtained by heating by applying a silver salt photographic method.

For example, JP-A-57-179840, 57-186744, 57
No. 198458, No. 57-207250 and the like disclose a technique for transferring a diffusible dye released or formed by thermal development to obtain a color image.

This type of technology is also described in, for example, JP-A-58-58543 and JP-A-5-58543.
A method of releasing a diffusible dye by oxidizing a non-diffusible reducing dye-providing substance, such as 9-168439, JP-A-58-79247, 59-174834, and 59-12431.
No. 59-159159, No. 60-2950, etc., a method of releasing a diffusible dye by coupling with an oxidant of a developing agent, JP-A Nos. 58-149046 and 58-149047, same
No. 59-124339, No. 59-181345, No. 60-2950, and the like, a method containing a non-diffusible compound that reacts with an oxidized product of a developing agent to form a diffusible dye, and further, JP-A No. 59-15
No. 2440, No. 59-124327, No. 59-154445, No. 59-1669
It contains a non-diffusible reducing dye-donor that loses its ability to release diffusible dye by oxidation, such as No. 54, and vice versa. There are methods, etc.

These heat-developable light-sensitive materials are obtained by transferring a released or formed diffusible dye to an image-receiving layer provided on the same support or on another support to obtain an image. In view of the above, it is improved in many points over the conventional heat-developable color light-sensitive materials.

Among these methods, so-called plain paper was generally used for the heat-sensitive transfer image-receiving sheet used in the heat-sensitive transfer recording method, but in recent years, good thermal conductivity, improved transfer dye concentration, transfer dye image In order to improve the storage stability of the product, impart mechanical strength, etc., heat-resistant polymer, binder,
It is known to provide a layer containing a color developer, a plasticizer, various solvents and the like. For example, JP-A-57-107885 and 57-137191 disclose a saturated polyester layer on a paper support. , An example of improving the transferability of the sublimable dye,
In JP-A-59-223425 and JP-A-60-24996, there is disclosed a technique in which a layer containing a vinyl chloride polymer is provided on a support to prevent fog and obtain a high transfer dye density, and JP-A-59-156791.
No. 59-184339 and No. 59-224844, there is a technique for adjusting the color tone of a transfer dye by containing a phenol resin or another color tone adjusting agent, and JP-A-59-158289,
Nos. 59-182785 and 60-1370735 have U in the image receiving layer.
A technique for improving the storage stability of a transfer dye image by adding a V agent, an antioxidant, etc. is described.

On the other hand, in the color image forming method by heat development, the image-like dye formed or released by heating is transferred and fixed to the image-receiving layer of the image-receiving sheet which is adhered in advance. Regarding the image receiving sheet for heat development, for example, JP-A-59-1243 is used.
Nos. 1 and 59-57237 describe examples of an image-receiving layer made of polyester that receives a sublimable dye, but this method has a problem in long-term storage stability of transferred images.

As a method in which the preservability of the transfer dye is good, JP-A-57-17
No. 9840, No. 58-58543, No. 58-79247, No. 58-149046
No. 59-152440 and the like, there is a method for obtaining an image by transferring a diffusible dye formed or released by heat development to an image-receiving layer made of a polymer having a mordant function, polyvinyl chloride or polycarbonate. Excellent image stability and sharpness.

Further, JP-A-59-158289 and JP-A-59-182785 disclose a technique for improving the long-term storage stability of a transferred dye image by using an image receiving layer made of polyvinyl chloride or polycarbonate containing a UV agent. 59-116655, 59-18
1349, 59-181350, 59-182447, 60-1913
No. 8 and the like disclose an image receiving layer made of a polymer having a mordant function containing various additives such as a dye release aid, a thermal solvent, and a plasticizer for the purpose of improving the transfer dye concentration, polyvinyl chloride or polycarbonate. ing.

In various thermal transfer systems as described above, it is known in the industry that the image-receiving sheet is provided by a solution coating system with the above-mentioned polymer layer as an image-receiving layer on a support such as paper, polyethylene film and cellulose triacetate film. It has high stability and low cost. Since the image receiving sheet is a so-called “final product” that the user can directly touch, the image receiving sheet has not only uniform image density but also the image receiving sheet surface (such as gloss and streaks due to coating, pinholes, craters, etc.). Therefore, it is necessary to have more stable and highly accurate coating.

However, when the transfer image is received from the color material supply sheet,
The image-receiving layer to be fixed usually contains a binder, a binder, a plasticizer, etc., if necessary, and after being dissolved in a solvent, a thin film coating on various supports according to the purpose, in the process of forming a film. Coating defects such as drying unevenness, coating streaks and craters are likely to occur, causing image defects such as uneven density of the finally obtained color image and increase of untransferred portions.

In order to improve these drawbacks, conventionally, a method of adding a so-called coating aid typified by a surfactant has been proposed, and most of these coating aids are improved by improving the viscosity of the coating liquid or lowering the surface tension. It is said that it is effective for defects during coating, but almost no effect is seen at an addition amount within the range that does not affect the performance of the image receiving layer, and these defects are caused when the solvent used has a low boiling point. Especially, when a solvent having a high boiling point is used, the amount of residual solvent increases, which causes problems such as impaired immobilization of the dye, making it difficult to cope with the production process.

Further, since the image-receiving sheet can be used as a transmissive type or a reflective type by changing the support, it is required to use various types of the support. It has also been found that, depending on the type, poor surface smoothness and non-uniformity increase the occurrence of coating defects such as coating streaks and pinholes.

In addition, the commonly used dimethyl silicone oil has a small improvement effect on coating streaks and craters, and has a narrow allowable range of the addition amount. If the addition amount is too large, pinholes and the like frequently occur.

However, none of the conventionally known techniques relating to these image receiving sheets describes any effective means for solving defects such as so-called streaks, unevenness, and film thickness variation that occur when the image receiving layer is formed.

Further, in the thermal transfer as described above, a decrease in transfer image density and uneven density, which are presumed to be caused by poor adhesion between the color material supply sheet and the image receiving layer, and peeling from the color material supply sheet image receiving layer after thermal transfer. In terms of sex, it is still not practically sufficient, and improvement is recognized.

[Object of the Invention]

Therefore, the first object of the present invention is to improve the coating performance of the image receiving layer. An object of the present invention is to provide an image-receiving sheet for thermal transfer with improved coating defects.

A second object of the present invention is to improve the adhesion between the color material supply sheet and the image receiving sheet during heating, and to have good releasability when the color material supplying sheet and the image receiving sheet are separated after heating for a certain period of time. To provide an image receiving sheet.

A third object of the present invention is to provide an image-receiving sheet for thermal transfer, which gives a high transfer density and has no defects in the finished image.

[Structure of Invention]

An object of the present invention is to provide an image-receiving sheet for thermal transfer which receives a transfer image from a color material supply sheet by heating, and at least one layer represented by formula (1) to
This is achieved by an image-receiving sheet for thermal transfer containing at least one selected from the silicone oils represented by (5).

In the formula, m, n and l each represent an integer of 1 to 2000, preferably 1 to 1000.

In a preferred embodiment of the present invention, the above-mentioned color material supply sheet has at least a photosensitive silver halide, a dye-donor substance, a reducing agent and a binder on a support, and a dye is formed or released by heating to develop a heat-developable color photosensitive material. As a material, an embodiment in which the transferred image is formed by the dye can be mentioned. In this aspect, the effect of the present invention is particularly remarkable.

 Hereinafter, the present invention will be described in detail.

The image-receiving sheet according to the present invention has an image-receiving layer capable of receiving and fixing the transferred image substance transferred from the color material supply sheet by the heat transfer process.

The color material supply sheet is a heat-developable photosensitive material that releases or forms a dye that can be transferred by heat development and a heat-sensitive transfer ink sheet used in a heat-sensitive transfer recording method, and the transfer image substance uses a dye and wax as a binder. It is an ink or the like in which a pigment or a dye is mixed.

The substance forming the image receiving layer according to the present invention is a substance capable of receiving the above-mentioned ink or dye during or after the heat transfer treatment, and is, for example, a polymer containing a tertiary amine or a quaternary ammonium salt, and is described in US Pat. No. 3,709,690. Those described in No. 1 are preferable. For example, as a polymer containing a quaternary ammonium salt, polystyrene-co-N, N, N-
The ratio of tri-n-hexyl-N-vinyl-benzylammonium chloride is 1: 4 to 4: 1, preferably 1: 1. Examples of polymers containing tertiary amines include polyvinyl pyridine and the like. The image-receiving layer according to the present invention may be obtained by mixing a polymer containing an ammonium salt, a tertiary amine or the like with gelatin, polyvinyl alcohol or the like and coating the mixture on a support. As another useful dye receiving substance, a heat-resistant organic polymer substance having a glass transition temperature of 40 ° C. or higher and 250 ° C. or lower described in JP-A-57-207250 is preferable. These polymers may be carried on a support as an image receiving layer, or may be used as a support itself.

As an example of the heat-resistant organic polymer substance, a molecular weight of 2000
~ 85,000 polystyrene, polystyrene derivatives having substituents with 4 or less carbon atoms, polyvinyl cyclohexane,
Polydivinylbenzene, polyvinylpyrrolidone, polyvinylcarbazole. Polyacetals such as polyallylbenzene, polyvinyl alcohol, polyvinyl formal and polyvinyl butyral, polyvinyl chloride, chlorinated polyethylene, polytrifluoroethylene, polyacrylonitrile, poly-N, N-dimethylallylamide, p
-Cyanophenyl group, pentachlorophenyl group and 2,
Polyacrylate having 4-dichlorophenyl group, polyacrylchloroacrylate, polymethylmethacrylate, polyethylmethacrylate, polypropylmethacrylate, polyisopropylmethacrylate, polyisobutylmethacrylate, poly-tert-butylmethacrylate, polycyclohexylmethacrylate, polyethyleneglycoldimethacrylate, Examples thereof include polyesters such as poly-2-cyano-ethyl methacrylate and polyethylene terephthalate, polycarbonates such as polysulfone, bisphenol A and polycarbonate, polyanhydrides, polyamides and cellulose acetates. Also, Polymer Handbook 2nd ed. (J.Bran
The synthetic polymers having a glass transition temperature of 40 ° C. or lower described in John Wlley & Sons, published by Drup, EHImmergut) are also useful. These polymer substances may be used alone or in a blend of two or more kinds, or may be used in combination of two or more kinds as a copolymer.

Examples of useful polymers include cellulose acetate such as triacetate and diacetate, heptamethylenediamine and terephthalic acid, fluorenedipropylpropylamine and adipic acid, hexamethylenediamine and diphenic acid, polyamide by a combination of hexamethylenediamine and isophthalic acid, and diethylene glycol. And diphenylcarboxylic acid, and polyesters, polyethylene terephthalate, and polycarbonate in combination with bis-p-carboxyphenoxybutane and ethylene glycol. These polymers may be modified. For example, polyethylene terephthalate using cyclohexanedimethanol, isophthalic acid, methoxypolyethylene glycol, 1,2-dicarbomethoxy-4-benzenesulfonic acid as a modifier is also effective.

Preferred image-receiving layers include the layer made of polyvinyl chloride described in JP-A-59-223425 and the layer formed of polycarbonate and a plasticizer described in JP-A-60-19138.

These polymers can also be used as an image receiving layer which also serves as a support, and the support may be formed of a single layer or a plurality of layers.

When the image-receiving layer of the present invention is provided on the substrate, the solution coating method is preferably used in view of stability of performance, production cost and the like. As the solvent in that case, various selections can be made depending on the image-receiving material, but commonly used organic solvents such as methylene chloride, tetrahydrofuran and the like can be used.

In the image-receiving layer of the present invention, a UV absorber, an antioxidant, a color adjusting agent, a hardener, a surfactant, an antistatic agent, a polymer latex, a non-photosensitive silver halide, a carboxy, a vinyl polymer containing a sulfo group, an organic Fluoro compounds, colloidal silica, matting agents, slip agents and the like can be added.

Various methods used in the art can be used for coating the image-receiving layer of the present invention on a substrate. That is,
Dip method, roller method, reverse roll method, air knife method, doctor blade method, spray method, bead method,
There are extrusion method, stretch flow method, curtain method and the like.

When the image-receiving layer of the present invention is formed by a means other than coating (for example, a film produced by extrusion molding is also used as a support and an image-receiving layer, or a thin film produced by extrusion molding or the like is used as the image-receiving layer). When laminated on another support as), the second and third objects of the present invention are achieved.

When the present invention is applied to a photothermographic material, various polymers described above can be used as a substance constituting the image-receiving layer that receives and fixes a dye transferred in an imagewise manner. May be an image receiving element having an image receiving layer on another suitable support, or the image receiving layer may be a single layer which is part of a heat developable color photographic material. If necessary, an opaque layer (reflective layer) for observing a dye image with reflected light may be included in the photographic material. The opaque layer may be provided on the support, or the support and the photosensitive layer. It may be a coating layer or the like between them.

The opacifying layer (reflecting layer) can include various materials that provide the necessary reflection, such as titanium dioxide.

The image-receiving layer in the present invention is of a form in which it is peeled from the photosensitive layer, and after imagewise exposure of the heat-developable color photosensitive material, the image-receiving layer is overlaid on the photosensitive layer and uniformly developed by heating.
In the form of thermal transfer or imagewise exposure of a heat-developable color light-sensitive material, uniform heat development, and then overlaying an image-receiving layer and heating at a temperature lower than the development temperature to transfer the dye image released or formed from the dye-donor substance. Includes those used.

The support of the image-receiving layer is not particularly limited, and may be either a transparent support or an opaque support, for example, a film of polyethylene terephthalate, polycarbonate, polystyrene, polyvinyl chloride, polyethylene, polypropylene, etc. and oxidation in these supports. Supports containing pigments such as titanium, barium sulfate, calcium carbonate, talc, baryta paper, RC paper laminated with a thermoplastic resin containing pigments on paper, metals such as cloths, glasses, aluminum, etc. Also, a support obtained by coating and curing an electron beam curable resin composition containing a pigment on these supports, a support having a coating layer containing a pigment provided on these supports, and the like are included. Be done. In particular, a support obtained by coating and curing an electron beam curable resin composition containing a pigment on paper, or having a pigment coating layer directly or on paper, and an electron beam curing resin on the pigment coating layer The support coated with the composition and cured can be used as it is as an image receiving material because the resin layer itself can be used as an image receiving layer.

The addition amount of the silicone oil used in the present invention varies depending on the material used, but is 10 ⁻⁶ to the volume of the image receiving layer coating liquid.
Can be used in a wide range of 10% by weight / volume, but 0.4 ^-4 to 1
It is preferably used in the range of weight / volume%.

When the image-receiving paper of the present invention is formed by a method other than coating, the same addition amount as described above is preferably used.

When the image-receiving sheet of the present invention is used as a color material fixing layer of a so-called thermal transfer recording system, the thermal transfer ink sheet having a color material layer provided on a substrate and the image-receiving sheet of the present invention are superposed on each other to form a thermal head. , Energizing head, laser,
The dye transferred onto the image-receiving layer of the present invention is fixed according to heat information from a xenon lamp or the like. Further, it may be fixed as an image having a preferable color tone by contacting, mixing or dissolving with a color tone adjusting agent contained in the image receiving layer in advance. Ink sheet for thermal transfer is TCP-cyan, TCP-magenta, TCP-yellow, TCC-P, TCC-
F (manufactured by General Corp.), TTR-F & SIR, CTTR-F, MT
In addition to TC-F (manufactured by Fuji Chemical Paper Industry Co., Ltd.), various commercially available products can be used. General techniques for heat-sensitive transfer ink sheets are known, and the image-receiving sheet of the present invention is useful even when used in combination with any of these types of heat-transfer ink sheets.

Further, the image receiving layer of the present invention may be formed on the same support as the color material transfer sheet, and in that case, the present invention is sufficiently effective.

When the image-receiving sheet of the present invention is used as a color material fixing layer of a so-called heat development transfer system, at least one photosensitive silver halide emulsion layer, an organic silver salt, a dye-donor substance and a color developing agent are provided on a substrate. Exposing the photothermographic material having
The dye image formed or released by the photothermographic material is received and fixed by superimposing it on the image-receiving sheet of the present invention and heating it with a heat block, a heat roller, an electric heating method or the like.

 Next, the color material supply sheet in the present invention will be described.

When the color material supply sheet in the present invention is a photothermographic material, the photothermographic material is a photosensitive silver halide and a reducing agent in the same layer or in two or more layers within the range where development reaction is possible during thermal development. , Containing a dye-donor and a binder,
Further, it contains an organic silver salt if necessary, and further has various photographic constitutional layers such as an overcoat layer, an undercoat layer, a backing layer, an intermediate layer, or a filter layer in addition to the above-mentioned layer (photosensitive layer). May be. The components used in the photographic constituent layers of the photothermographic material are coated on a support, and the thickness of coating is preferably 1 to 1,000 μm after drying, more preferably 3 to 20 μm.

As the photosensitive silver halide, silver chloride, silver bromide,
Examples thereof include silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide and silver chloroiodobromide. The photosensitive silver halide can be prepared by any method such as a single jet method and a double jet method in the field of photographic technology, but a photosensitive silver halide prepared according to a usual method for preparing a silver halide gelatin emulsion. A photosensitive silver halide emulsion containing ## STR3 ## gives favorable results.

The photosensitive silver halide emulsion may be chemically sensitized by any method in the photographic art. Examples of the sensitizing method include various methods such as gold sensitization, sulfur sensitization, gold-sulfur sensitization, and reduction sensitization.

The silver halide in the above light-sensitive emulsion may be coarse particles or fine particles, but the preferable grain size is about 0.001 μm to about 1.5 μm, and more preferably about 0.01 μm to about 0.01 μm. It is about 0.5 μm.

The photosensitive silver halide may be one in which a photosensitive silver salt-forming component is allowed to coexist with an organic silver salt described below to form a photosensitive silver halide on a part of the organic silver salt.

These light-sensitive silver halide and light-sensitive silver salt forming components can be used in combination in various methods.
It is preferably 0.001 g to 50 g, and more preferably 0.1 g to 10 g per 1 m ² per layer.

As the reducing agent, those commonly used in the field of photothermographic materials can be used, for example, US Pat. No. 3,531,28
No. 6, No. 3,761,270, No. 3,764,328, each specification, RD No. 12146, No. 15108, No. 15127 and JP-A No. 56127.
P-phenylenediamine-based and p-aminophenol-based developing agents, phosphoroamidophenol-based and sulfonamidephenol-based developing agents, and hydrazone-based color developing agents described in JP-A-27132.
Further, the color developing agent precursors described in U.S. Pat. Nos. 3,342,599 and 3,719,492, JP-A-53-135628 and JP-A-54-79035, etc. can also be advantageously used.

Particularly preferable reducing agents include the reducing agents described in JP-A-56-146133.

The amount of the reducing agent used depends on the type of the photosensitive silver halide used, the type of the organic acid silver salt, the type of other additives, etc., but is usually 0.
It is in the range of 05 to 10 moles, preferably 0.1 to 5 moles.

As the dye-donor substance, any substance that participates in the reduction reaction of silver halide and / or an organic silver salt and can form a diffusible dye as a function of the reaction may be used. Negative-working dye-donors (ie, forming a negative dye image when negative-working silver halide is used) and positive-working dye-donors (ie, negative-working dyes) When a silver halide is used, a positive dye image is formed), but any of these may be used. Negative type dye-donor substances are further classified as follows, and any of them may be used.

Each dye-providing substance will be further described.

Examples of the reducing dye releasing compound include compounds represented by the following general formula (1).

General formula (1) Car-NHSO ₂ -Dye (1) In the formula, Car is a reducing substrate (so-called carrier) that is oxidized to release a dye upon reduction of silver halide and / or organic silver salt, Dye is a diffusible dye residue.

Specific examples of the above reducing dye-releasing compounds are disclosed in JP-A-
57-179840, 58-116537, 59-60434, 59
-65839, 59-71046, 59-87450, 59-887
No. 30, 59-123837, 59-165054, 59-165055
The compounds described in each of the publications and the like are listed, and examples thereof include the following compounds.

Exemplified dye donor Examples of other reducing dye releasing compounds include compounds represented by the following general formula (2).

General formula (2) In the formula (2), A ₁ and A ₂ each represent a hydrogen atom, a hydroxyl group or an amino group, and Dye is Dye in the general formula (1).
Is synonymous with Specific examples of the compound represented by the general formula (2) are shown in JP-A-59-124329.

Examples of the coupling dye-releasing compound include compounds represented by the following general formula (3).

In the formula (3) Cp ₁ Jn Dye (3), Cp is an organic group (so-called coupler residue) capable of releasing a diffusible dye by reacting with an oxidant of a reducing agent, and J is 2 It is a valent bonding group, and the bond between Cp ₁ and J is cleaved by the reaction with the oxidized form of the reducing agent. n represents 0 or 1, and Dye has the same meaning as defined in the general formula (1). Further, Cp ₁ is preferably substituted with various ballast groups in order to make the coupling dye-releasing compound non-diffusible. The ballast group has 8 or more carbon atoms depending on the form of the photosensitive material used. (More preferably 12 or more) organic groups, or hydrophilic groups such as sulfo groups and carboxyl groups, or 8 or more (more preferably 12 or more) carbon atoms and hydrophilic groups such as sulfo groups and carboxy groups Is a group having both. Another particularly preferred ballast group can include a polymer chain.

Specific examples of the compound represented by the above general formula (3) include JP-A Nos. 57-186744, 57-122596, and 57-1606.
98, 59-174834, 57-224883, 59-159159
And Japanese Patent Application No. 59-104901. Examples thereof include the following compounds.

Exemplified dye donor Examples of the coupling dye forming compound include compounds represented by the following general formula (4).

General formula (4) Cp ₂ XQ) In the formula (4), Cp ₂ is an organic group capable of forming a diffusible dye by reacting (coupling reaction) with an oxidant of a reducing agent (so-called coupler residue). And X represents a divalent linking group and Q represents a ballast group. The molecular weight of the coupler residue represented by Cp ₂ is preferably 700 or less, more preferably 500 or less because of the diffusibility of the dye formed.

Further, the ballast group is preferably the same ballast group as the ballast group defined by the general formula (3), and particularly preferably has 8 or more (more preferably 12 or more) carbon atoms and a hydrophilic group such as a sulfo group or a carboxy group. The groups having the both are preferred, and the polymer chain is more preferred.

As the coupling dye forming compound having this polymer chain, a polymer having a repeating unit derived from a monomer represented by the following general formula (5) is preferable.

General formula (5) Cp ₂ XY _l ZL (5) In the formula, Cp ₂ and X have the same meanings as defined in general formula (4), and Y represents an alkylene group, an arylene group or an aralkylene group, Z represents a divalent organic group, L
Represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group, and represents 0 or 1.

Specific examples of the coupling dye-forming compounds represented by the general formulas (4) and (5) are described in JP-A-59-124339 and JP-A-59-124339.
59-181345, Japanese Patent Application No. 58-109293, 59-179657,
The compounds described in JP-A-59-181604, JP-A-59-182506, JP-A-59-182507 and the like can be mentioned, for example, the following compounds can be mentioned.

Exemplified dye donor polymer In the above general formulas (3), (4) and (5), Cp
_{When the} coupler residue defined by ₁ or Cp ₂ is described in more detail, the groups represented by the following general formulas (6) to (15) are preferable.

In the formulas (6) to (15), R ¹ , R ² , R ³ and R ⁴ are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkyloxycarbonyl group, aryloxy. Carbonyl group, alkylsulfonyl group, arylsulfonyl group, carbamoyl group, sulfamoyl group, acyloxy group, amino group, alkoxy group,
Represents an aryloxy group, a cyano group, a ureido group, an alkylthio group, an arylthio group, a carboxyl group, a sulfo group or a heterocyclic residue, which further includes a hydroxyl group, a carboxyl group, a sulfo group, an alkoxy group, a cyano group, a nitro group, an alkyl group. It may be substituted with a group, an aryl group, an aryloxy group, an acyloxy group, an acyl group, a sulfamoyl group, a carbamoyl group, an imide group, a halogen atom or the like.

These substituents are selected according to the purpose of Cp ₁ and Cp ₂ , and as described above, _one of the substituents is preferably a ballast group in Cp _{1 and} the diffusibility of the dye formed in Cp ₂ In order to increase the molecular weight, the substituent is preferably selected so that the molecular weight is 700 or less, more preferably 500 or less.

Examples of the positive type dye-donor substances include oxidizing dye-releasing compounds represented by the following general formula (16).

General formula (16) In the formula (16), W ¹ represents an atomic group necessary for forming a quinone ring (which may have a substituent on the ring),
R ⁵ represents an alkyl group or a hydrogen atom, and B represents (In the formula, R ⁶ represents an alkyl group or a hydrogen atom, and R ⁷ represents an oxygen atom or Represents ) Or —SO ₂ —, r represents 0 or 1, and Dye has the same meaning as defined in formula (1). Specific examples of this compound are disclosed in JP-A-59-166954 and JP-A-59-166954.
No. 154445 and the like, for example, there are the following compounds.

Exemplified dye donor Another positive dye-donating substance is represented by the following general formula (17).
There is a compound represented by the following which loses its dye releasing ability when oxidized.

General formula (17) In the formula (17), W ₂ represents a group of atoms necessary for forming a benzene ring (which may have a substituent on the ring), and R ⁵ , B, r and Dye are represented by the general formula ( It has the same meaning as defined in 16). Specific examples of this compound are disclosed in JP-A-59-12.
Nos. 4329 and 59-154445 and the like, for example, the following compounds.

Exemplified dye donor Still another positive type dye-providing substance is a compound represented by the following general formula (18).

General formula (18) (18) In the above formula, W ² , R ⁵ and Dye are expressed by the general formula (1
It has the same meaning as defined in 7). Specific examples of this compound are described in JP-A-59-154445 and the like, for example, the following compounds.

Exemplified dye donor The above general formulas (1), (2), (3), (16) and (1
The residue of the diffusible dye represented by Dye in 7) and (18) will be described in more detail. As the residue of the diffusible dye, the molecular weight is preferably 800 or less, more preferably 600 or less for the diffusibility of the dye, and an azo dye, an azomethine dye, an anthraquinone dye, a naphthoquinone dye, a styryl dye, a nitro dye, Residues such as quinoline dye, carbonyl dye and phthalocyanine dye are exemplified. These dye residues may be in the form of a short-wavelength which can be multicolored during heat development or transfer. Further, these dye residues are used, for example, in JP-A-59-48765 for the purpose of improving the light fastness of an image.
The chelateable dye residues described in JP-A No. 50-124337 are also preferable forms.

These dye-donor substances may be used alone or in combination of two or more. The amount used is not limited, and depends on the kind of the dye-donating substance, single use or two or more combined use, or photographic constituent layer or single layer or two or more multi-layers of the light-sensitive material of the present invention. It may be determined, but for example, the amount used may be 0.005 g to 50 g, preferably 0.1 g to 10 g per 1 m ² . 0.005g to 10g per 1m ² preferably 0.1
g to 5.0 g can be used.

The method of incorporating the dye-donor compound into the photographic constituent layer of the photothermographic material is arbitrary, and examples thereof include low-boiling point solvents (methanol, ethanol, ethyl acetate, etc.) or high-boiling point solvents (dibutyl phthalate, dioctyl phthalate, triclenzel phosphate, etc.). Or ultrasonically dispersed or dissolved in an alkaline aqueous solution (for example, 10% sodium hydroxide aqueous solution) and then neutralized with a mineral acid (for example, hydrochloric acid or nitric acid), or It can be used after being dispersed by using a ball mill together with an aqueous solution of an appropriate polymer (eg, gelatin, polyvinyl butyrate, polyvinylpyrrolidone, etc.).

As organic silver salts, Japanese Patent Publication Nos. 43-4921 and 44-26582
No. 45-18416, 45-12700, 45-22185,
JP-A-49-52626, JP-A-52-31728, JP-A-52-137321,
Nos. 52-141222, 53-36224 and 53-37610 and U.S. Pat.Nos. 3,330,633 and 3,794,496
No. 4,105,451, 4,123,274, 4,168,98
Silver salts of aliphatic carboxylic acids as described in each specification such as No. 0, for example, silver laurate, silver myristate,
Aromatic carboxylates such as silver palmitate, silver stearate, silver arachidonic acid, silver behenate, α- (1-phenyltetrazolethio) acetic acid silver, for example, silver benzoate, silver phthalate, etc., JP-B-44-26582 No. 45, No. 12-12700, No. 45
-18416, 45-22185, JP-A-52-31728, 52
-137321, JP-A-58-118638, JP-A-58-118639 and the like, silver salts of imino groups such as silver benzotriazole, silver 5-acetamidobenzotriazole, and 5-nitrobenzo. Triazole silver, 5-chlorobenzotriazole silver, 5-methoxybenzotriazole silver, 4-sulfobenzotriazole silver, 4-hydroxybenzotriazole silver, 5-aminobenzotriazole silver, 5-methylbenzotriazole silver, 5-methylsulfobenzo Triazole silver, 5-carboxybenzotriazole silver, imidazole silver, benzimidazole silver, 6-nitrobenzimidazole silver, pyrazole silver,
Urazole silver, 1,2,4-triazole silver, 1H-tetrazole silver, 3-amino-5-benzylthio-1,2,4-triazole silver, saccharin silver, phthalazinone silver, phthalimide silver, and other 2-mercaptobenzoxazole Silver, mercaptooxadiazole silver, 2-mercaptobenzothiazole silver, 2-mercaptobenzimidazole silver, 3-mercapto-4-phenyl-1,2,4-triazole silver, 4-hydroxy-6-methyl-1,3 , 3a, 7-Tetrazaindene silver and 5-methyl-7-hydroxy-1,
2,3,4,6-Pentazaindene silver and the like can be mentioned.

Among the above organic silver salts, silver salts of imino groups are preferable, particularly silver salts of benzotriazole derivatives, more preferably silver salts of 5-methylbenzotriazole derivatives.

The organic silver salt may be used singly or in combination of two or more kinds, and the isolated one may be dispersed in a binder by an appropriate means for use, or a silver salt may be prepared in an appropriate binder. However, it may be directly used without isolation.

The amount of the organic silver salt used is 0 per mol of the dye-providing substance (dye-donating monomer unit when the substance is a polymer).
It is preferably 1 to 5 mol, more preferably 0.3 to 3 mol.

As the binder used in the photothermographic material, synthetic or natural polymer substances such as polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl pyrrolidone, gelatin and phthalated gelatin are used. One or two or more can be used in combination. In particular, it is preferable to use gelatin or a derivative thereof in combination with a hydrophilic polymer such as polyvinylpyrrolidone or polyvinyl alcohol, more preferably Japanese Patent Application No.
It is the binder described in No. 104249.

The amount of binder used is usually 0.005 g per 1 m ^{2 of} support.
-100 g, preferably 0.01-40 g. Further, the binder is preferably used 0.1g ~ 10g per 1g of the dye-providing substance or dye-providing substance monomer unit,
More preferably, it is 0.25 to 4 g.

The support used in the photothermographic material includes, for example, polyethylene film, cellulose acetate film and polyethylene terephthalate film, synthetic plastic film such as polyvinyl chloride, and photographic base paper, printing paper, baryta paper and resin-coated paper. A support etc. are mentioned.

Various heat solvents may be added to the photothermographic material. The thermal solvent may be any substance that promotes thermal development and / or thermal transfer, and is preferably a solid, semi-solid or liquid at room temperature that dissolves or dissolves in the binder when heated, and is preferably Urea derivatives (eg, dimethylurea, diethylurea, phenylurea, etc., amide derivatives, (eg, acetamide, benzamide, etc.), polyhydric alcohols (eg, 1.5-pentanediol, 1,6-pentanediol, 1,2- Cyclohexane diol, pentaerythritol, trimethyl roll ethane, etc.) or polyethylene glycols, etc. Specific examples include compounds described in Japanese Patent Application No. 58-104249. The above may be used in combination.

In addition to the above components, various additives can be added to the photothermographic material, if necessary.

For example, as a development accelerator, U.S. Pat.
No. 3, No. 3,531,285, No. 4,012,260, No. 4,060,42
No. 0, No. 4,088,496 No. 4,207,392, RD No. 15733,
No. 15734, No. 15776B, JP-A-56-130745,
Alkali-releasing agents such as urea and guanidinium trichloroacetate described in JP-A-56-132332, JP-B-45-1270
Organic acid described in No. 0, -C0 described in U.S. Patent No. 3,667,959
_{-, - SO 2 -, -} SO- non-aqueous polar solvent a compound having a group, U.S. Patent No. 3,438,776 No. described melt formers,
There are polyalkylene glycols and the like described in U.S. Pat. No. 3,666,477 and JP-A-51-19525.

Examples of color toning agents include JP-A-46-4928 and JP-A-46-4928.
-6077, 49-5019, 49-5020, 49-91215
No. 49, No. 107727, No. 50-2524, No. 50-67132,
50-67641, 50-114217, 52-33722, 52
-99813, 58-1020, 53-55115, 53-7602
No. 0, No. 53-125014, No. 54-156523, No. 54-156524
No. 54, No. 54-156525, No. 54-156526, No. 55-4060,
No. 55-4061, No. 55-32015 West German Patent No. 2,140,406,
No. 2,147,063, No. 2,220,618, U.S. Pat.No. 3,080,25
No. 4, No. 3,847,612, No. 3,782,941, No. 3,994,7
No. 32, No. 4,123,282, No. 4,201,582 and the like, which are compounds described in phthalazinone, phthalimide, pyrazolone, chitisolinone, N-hydroxynaphthalimide, benzoxazine, naphthoxazinedione, 2,3.
-Dihydro-phthalazinedione, 2,3-dihydro-1,3-
Oxazine-2,4-dione, oxypyridine, aminopyridine, hydroxyquinoline, aminoquinoline, isocarbostyril, sulfonamide, 2H-1,3-benzothiazine-2,4- (3H) dione, benzotriazine, mercaptotriazole, Dimercaptotetrazapentalene,
Phthalic acid, naphthalic acid, phthalamic acid, etc., and a mixture of one or more of these with an imidazole compound, or a mixture of at least one acid or acid anhydride such as phthalic acid, naphthalic acid and a phthalazine compound, Furthermore, a combination of phthalazine and maleic acid, itaconic acid, quinolinic acid, gentisic acid and the like can be mentioned.

Further, 3-amino-5-mercapto-1,2,4-triazols, 3-acylamino-5-mercapto-1,2, described in JP-A-58-189628 and JP-A-58-193460 are disclosed.
4-triazoles are also effective.

Further, as the antifoggant, for example, Japanese Patent Publication
47-11113, JP-A-49-90118, 49-10724, 4
9-97613, 50-101019, 49-130720, 50-
123331, 51-47419, 51-57435, 51-7822
No. 7, No. 51-104338, No. 53-19825, No. 53-20923
No. 51-50725, No. 51-3223, No. 51-42529, No. 51-42529
No. 51-81124, No. 54-51821, No. 55-93149, British Patent No. 1,455,271, U.S. Patent No. 3,885,968, No. 3,700,
No. 457, No. 4,137,079, No. 4,138,265, West German Patent No. 2,617,907, etc., a second mercuric salt which is a compound, or an oxidizing agent (for example, N-halogenacetamide, N-halogenosuccinimide, Perchloric acid and its salts, inorganic peroxides, persulfates, etc.), or acid and its salts (eg sulfinic acid, lithium laurate,
Rosin, diterpenic acid, thiosulfonic acid, etc.), or sulfur-containing compounds (for example, mercapto compound-releasing compounds, thiouracil, disulfide, sulfur simple substance, mercapto-1,2,4-triazole, thiazoline thione, polysulfide compounds, etc.), etc. Oxazoline, 1,2,4
-Compounds such as triazole and phthalimide. Further, a thiol (preferably thiophenol compound) compound described in JP-A-59-111636 is also effective as another antifoggant.

Examples of the antifoggants include hydroquinone derivatives described in Japanese Patent Application No. 59-56506 (for example, di-t-octylhydroquinone, dodecanylhydroquinone, etc.), hydroquinone derivatives described in Japanese Patent Application No. 59-66380, and benzotriazole. A combination with a derivative (for example, 4-sulfobenzotriazole, 5-carboxybenzotriazole, etc.) can be preferably used.

Further, as a stabilizer, a print-out preventing agent after treatment may be used at the same time, for example, JP-A-48-45228 and JP-A-5-45228.
0-119624, 50-120328, 53-46020 and the like halogenated hydrocarbons, specifically tetrabromobutane, tribromoethanol, 2-bromo-2-tolylacetamide, 2-bromo Examples include 2-tolylsulfonylacetamide, 2-tribromomethylsulfonylbenzothiazole and 2,4-bis (tribromomethyl) -6-methyltriazine.

Also, Japanese Examined Patent Publication No. 46-5393, Japanese Unexamined Patent Publication No. 50-54329 and
Post treatment may be carried out using sulfur-containing compounds as described in 0-77034.

Furthermore, U.S. Pat.Nos. 3,301,678 and 3,506,444
No. 3,824,103 and 3,844,788 isothiuronium-based stabilizer precursors, also U.S. Pat.Nos. 3,669,670, 4,012,260, 4,060,42
The activator stabilizer precursor described in No. 0 etc. may be contained.

Further, a water-releasing agent such as sucrose or NH ₄ Fe (SO ₄ ) ₂ · 12H ₂ O may be used. Furthermore, as in JP-A-56-132332, water is supplied to carry out heat development. Good.

In the light-sensitive material of the present invention, in addition to the above components, if necessary, an antihalation dye, a fluorescent whitening agent, a hardener,
Various additives such as antistatic agents, plasticizers, spreading agents, coating aids and the like can be added.

The photothermographic material as described above, after imagewise exposure as it is, is usually in the temperature range of 80 ° C to 200 ° C, preferably 102 ° C to 170 ° C, for 1 second to 180 seconds, preferably for 1.5 seconds to 120 seconds.
Color development is achieved simply by heating for a second. Further, if necessary, a water-impermeable material may be brought into close contact with the surface for development, or preheating may be carried out at a temperature range of 70 ° C. to 180 ° C. before exposure.

The conditions and methods of heat transfer from the heat-developable photosensitive material and the heat-sensitive transfer ink sheet to the image-receiving sheet may be the same as before,
Known means can be applied.

The heating means for the photothermographic material and its image-receiving sheet are
All methods applicable to ordinary photothermographic materials can be used, for example, contact with a heated block or plate, contact with a heat roller or a heat drum, passage in a high temperature atmosphere, or high frequency heating. Alternatively, a Joule heat generated by energization or a strong magnetic field can be used by providing a conductive layer in the light-sensitive material of the present invention or in the image-receiving layer (element) for thermal transfer.

The heating pattern is not particularly limited. For example, a method of preheating (preheating) and then heating again, a high temperature for a short time, or a low temperature for a long time, continuously rising, falling, or repeating, and further discontinuous Heating is possible, but a simple pattern is preferred. Further, it may be a system in which exposure and heating proceed simultaneously.

〔Example〕

Example-1 An image receiving sheet for thermal transfer was produced as follows. 0.5 kg of polyvinyl chloride (CH-3, manufactured by Nippon Zeon) was dissolved in 19 l of tetrahydrofuran with stirring, and 0.2 l of a solution of methylphenyl silicone oil (KF-54, manufactured by Shin-Etsu Chemical Co., Ltd.) in tetrahydrofuran (5% by weight / volume). Add, dissolve,
Finally, it was finished with tetrahydrofuran so that the total amount was 20 liters.

As a coating liquid for comparison, a solution which did not contain the silicone oil of the present invention and had the same concentration was prepared.

Using a reverse roll coater, the coating solution prepared above was applied at a coating speed of 5 m / min. Drying conditions (first drying zone 80 ° C,
Continuous coating was performed for about 2 hours under the conditions of the second drying zone 110 ° C. and the third drying zone 30 ° C.) so that ² g / m ² of polyvinyl chloride was coated on the high-quality paper.

As a result, an image-receiving sheet (Sample-II) having good surface smoothness without coating defects was obtained with the coating liquid containing methylphenyl silicone oil, but in the case of the coating liquid containing no silicone oil of the present invention (Sample -I) is a coating stripe,
It was not possible to obtain a sample having a uniform coating film due to frequent drying unevenness.

Next, a color material supply sheet was produced as follows. 2.
1.5 g on a 20 μm thick transparent polyethylene terephthalate film (support) having a 0 g / m ² gelatin subbing layer.
A layer containing polyvinyl butyral (S-REC W-201, manufactured by Sekisui Chemical Co., Ltd.) of / m ² is provided, and the dye (1) shown below, which is dispersed by an alumina ball mill, in each layer is 2.
The content was 0 × 10 ⁻³ mol / m ² .

Pigment (1) The color material supply sheet and the image receiving sheet for thermal transfer are superposed, the applied power is fixed at 0.8 W / dot from the support side of the color material supply sheet by the Samar head, and the pulse width is stepwise applied from 5 ms to 40 ms to perform thermal transfer. A magenta-colored step wedge image was obtained on the surface of the image receiving sheet.

Table 1 shows the results of measuring the reflection density (green light) of these samples with a Sakura photoelectric densitometer (PDA-65).

As is clear from the results in Table 1, the thermal transfer image-receiving sheet of the present invention containing the silicone oil has not only good coatability, but also high and uniform image density and good peelability. I understand.

Example-2 An image receiving sheet for thermal transfer was prepared as follows. Polycarbonate (Panlite L-1250, Teijin Chemicals) 5.6Kg
Was dissolved in 35 liters of ethane dichloride with stirring, and then 0.2 liter of a solution of methylphenyl silicone oil (KF-54, manufactured by Shin-Etsu Chemical Co., Ltd.) in ethane dichloride (2% by weight / volume) was added and dissolved.
Further, the following UV absorbers and antioxidants were added so that the amounts would be 0.7 / m ² , respectively, and finally the total amount was 40 liters, and the product was finished with ethane dichloride (referred to as coating liquid C).

For comparison, dimethyl silicone oil (KF-96,
Shin-Etsu Chemical Co., Ltd.) Add and dissolve the same amount in the same manner, and apply coating liquid C
Same as above, but with UV absorber and antioxidant added (Coating liquid B
And a UV absorber and an antioxidant were added in the same manner as the coating liquid C, and a polycarbonate solution (referred to as a coating liquid A) was prepared to have the same concentration.

Using the coating liquid prepared above, a wire bar coater was used to coat at coating speeds of 5 and 10 m / min and drying conditions (first drying zone of 50 ° C. and 90 ° C., second and third drying zones of Example-
Same as 1. ), Continuous coating for 1 hour each so that polycarbonate is coated on the photographic baryta paper at 15 g / m ²
The applicability was evaluated. Further, a photothermographic material was prepared as follows.

(UV absorber) (Antioxidant) <Preparation of silver iodobromide emulsion> At 50 ° C, JP-A-57-92523 and JP-A-57-92524.
Gelatin 20 using the mixing agitation shown in No.
g, distilled water 1000 ml and ammonia solution A were mixed with 500 ml of an aqueous solution containing 11.6 g of potassium iodide and 130 g of potassium bromide and 500 ml of an aqueous solution containing 1 mol of silver nitrate and ammonia. At the same time, pAg and pH were added while being kept constant. Further, by controlling the addition rates of the solutions B and C, a core emulsion having a silver iodide content of 7 mol%, a regular hexahedron and an average grain size of 0.25 μm was prepared.

Then, in the same manner as described above, the silver iodide content is 1 mol%.
By coating the silver halide shell of
A core / shell type silver halide emulsion having an average grain size of 0.3 μm (shell thickness of 0.05 μm) was prepared. (The coefficient of variation of particle size distribution was 8%.) The above emulsion was washed with water and desalted to obtain a yield of 700 ml.

A green-sensitive silver iodobromide emulsion was prepared from the obtained silver iodobromide emulsion as follows.

<Preparation of green-sensitive silver iodobromide emulsion> Said silver halide 700 ml 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene 0.4 g Gelatin 32 g Sodium thiosulfate 10 mg Sensitizing dye methanol 1% below Liquid 80 ml Distilled water 1200 ml Sensitizing dye <Preparation of Dye-Donating Substance Dispersion> 33.5 g of the following polymeric dye-donating substance (1) and 5.00 g of the following hydroquinone compound were dissolved in 200 ml of ethyl acetate,
Alkanol XC (manufactured by DuPont) 124 ml of 5% by weight aqueous solution
And phenylcarbamoylated gelatin (Russlaw,
Type 17819PC) was mixed with 720 ml of gelatin aqueous solution containing 30.5 g and dispersed with an ultrasonic homogenizer, and ethyl acetate was distilled off to adjust the pH to 5.5 to 795 ml.

Polymeric dye-donor (1) Hydroquinone compound <Preparation of Reducing Agent Dispersion Liquid> The following developer (1) 23.3 g, the following development accelerator 1.10 g, poly (N-vinylpyrrolidone) 14.6 g, and the following fluorosurfactant 0.50 g are dissolved in water to give a pH of 5. 5 to 250 ml.

Developer (1) Development accelerator Surfactant <Preparation of Organic Silver Salt Dispersion> 2-Methylbenzotriazole silver (28.8 g) obtained by reacting 5-methylbenzotriazole and silver nitrate in a water-alcohol mixed solvent, poly (N-vinylpyrrolidone 91)
6.0 g and 4-sulfobenzotriazole sodium salt
Disperse 1.33g with alumina ball mill, adjust to pH 5.5 and 200m
l

<Preparation of Photothermographic Material> 12.5 ml of the organic silver salt dispersion, the green-sensitive silver iodobromide emulsion
6.00 ml, 39.8 ml of the above-mentioned dye-donor dispersion liquid and 12.5 ml of the above-mentioned reducing agent dispersion are mixed, and a hardener solution {tetra (vinylsulfonylmethyl) methane and taurine is added 1: 1.
(Weight ratio), and dissolved in a 1% aqueous solution of phenylcarbamoylated gelatin to make tetra (vinylsulfonylmethyl) methane 3% by weight. } To 2.
50 ml and polyethylene glycol 300 as hot solvent
After adding 3.42 g of (Kanto Chemical Co., Inc.), it was coated on a 180 μm-thick photographic polyethylene terephthalate film with an undercoat so that the amount of silver would be 1.76 g / m ^2, and further on it. And a protective layer made of a mixture of the phenylcarbamoylated gelatin and poly (N-vinylpyrrolidone).

Through the step wedge for the photothermographic material
1600C.MS exposure is applied, and it is overlaid on the image-receiving sheet and heat-developed (Developer Module 277, 3M Company) at 150.
After heat development at 1 ° C. for 1 minute, the photosensitive sheet and the image receiving sheet were immediately peeled off, and a negative image of a magenta step wedge was obtained on the surface of the image receiving sheet.

The reflection density of the obtained magenta image was measured with a densitometer (PDA-6
5, the maximum density was measured by Konishi Roku Photo Industry Co., Ltd.

Further, the peeling property at the time of peeling and the density unevenness of the obtained transfer image portion were detailed.

The results are shown in Table-2.

As is clear from the results shown in Table 2, the image-receiving sheet for heat-development and transfer containing the silicone oil of the present invention not only has significantly improved coating stability, but also after heat-development which is maintained at a high temperature for a relatively long time. It can be seen that it has a good peeling property and a high maximum density without uneven density can be obtained.

〔The invention's effect〕

 The effects of the present invention are listed below.

(1) The coating performance of the image receiving layer is improved. Specifically, when coating defects such as coating streaks, craters, and pinholes are remarkably improved, and the balance of the relative concentrations of other components contained in the coating liquid is disturbed (for example, from coating liquid during coating). It is possible to maintain good coating performance even when the solvent evaporates, etc.), and it becomes possible to perform stable coating in a wider silicone oil concentration range than before.

(2) In the case of an image receiving sheet in which the color material supplying sheet and the image receiving sheet are individually made and then the two are brought into close contact with each other until the time of thermal transfer, the adhesion between the two is improved.

(3) The peelability of the color material supply sheet after thermal transfer from the image receiving sheet is improved.

(4) The transfer density is increased, and defects in the finished image (density unevenness and generation of untransferred portions) are improved.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-71287 (JP, A) JP-A-60-212394 (JP, A) JP-A-61-237694 (JP, A) JP-A-61- 295075 (JP, A) JP 62-35885 (JP, A) JP 56-14566 (JP, A) Actually opened 61-125466 (JP, U) JP-B-3-285 (JP, B2) Japanese Patent Publication 4-1337 (JP, B2) Japanese Patent Publication 2-3832 (JP, B2) Japanese Patent Sho 61-13507 (JP, B2) Japanese Patent 59-21311 (JP, B2) Japanese Patent Sho 57-20149 (JP, B2)

Claims (2)

[Claims] 1. A thermal transfer image-receiving sheet which receives a transferred image from a color material supply sheet by heating, wherein at least one layer constituting the image-receiving layer of the image-receiving sheet is selected from silicone oils represented by formulas (1) to (5). An image receiving sheet for thermal transfer, comprising at least one of the following: In the formula, m, n and l each represent an integer of 1 to 2000. 2. A heat-developable color light-sensitive material in which the color material supply sheet has at least a photosensitive silver halide, a dye-donor, a reducing agent and a binder on a support, and a dye is formed or released by heating. The thermal transfer image-receiving sheet according to claim 1, wherein the transfer image is formed of the dye.