JPH0245178B2 - NETSUGENZOSHASHINZAIRYONIOKERUJUZOYOSO - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an image-receiving element in a heat-developable photographic material, and more particularly, the present invention relates to an image-receiving element in a heat-developable photographic material, and more particularly, it is possible to sublimate and transfer an imagewise distribution of a sublimable dye or precursor formed in a photosensitive element by heat development to obtain a clear color image. The present invention relates to an image receiving element capable of suppressing image density deterioration. The conventionally known color photography method using photosensitive silver halide is superior to other color photography methods in terms of photosensitivity, gradation, image preservation, etc., and has been the most widely put into practical use. . However, in this method, wet processing is used for steps such as development, bleaching, fixing, and water washing, which takes time and effort, and there are concerns that the processing chemicals may cause pollution to the human body, or the processing room and There are many problems, such as concerns about contamination of workers by treatment chemicals, and furthermore, the labor and cost of waste liquid treatment. Therefore, there is a need for the development of a method for forming color images that allows dry processing. By the way, black and white photothermographic materials characterized in that the developing step is carried out by heat treatment have been known for a long time; for example, Japanese Patent Publications Nos. 43-4921 and 43-4924
There is a description in the issue, and a photosensitive material consisting of an organic acid silver salt, silver halide, and a developer is disclosed. Furthermore, many color heat-developable photosensitive materials are also known, to which this black-and-white photothermographic material is applied. In addition, as a method for forming a heat-developable color image, for example, U.S. Pat.
No. 3764328, JP-A-56-27132, JP-A No. 56-27133,
Research Disciosure No.15108, same No.15127, same
As described in No. 12044 and No. 16479, there is a color image forming method using an oxidized color developing agent and a coupler. Other thermal development color image forming methods include, for example, JP-A Nos. 52-105821, 52-105822, and 56-
There are silver dye bleaching methods described in No. 50328 and US Pat. No. 4,235,957. However, these proposals regarding color heat-developable photosensitive materials have been difficult or even impossible to bleach or fix the black, white, and silver images formed at the same time, or even if it is possible, wet processing or other methods are required. It is what you need. Therefore, these proposals are not found to be desirable, as it is difficult to obtain clear color images, and complicated post-processing is required. Still another method for forming a heat-developable color image is, for example, the dye silver salt method described in Research Disclosure No. 16966. This method is attracting attention as a way to compensate for the drawbacks of the above two methods, but since the dye is transferred using a solvent, not only the dye but also other undesirable additives are transferred, resulting in color turbidity. In addition, the dye silver salt itself is also transferred, which has the disadvantage of causing image fog. Therefore, the present inventors previously proposed an improved technique for forming a heat-developable color image in Japanese Patent Application No. 122596/1983. The technology proposed in the future is
The method uses a color-donor material that is capable of reacting with the oxidized form of the developing agent to release a sublimable dye or precursor as a function of development. According to this method, the sublimable dye or precursor is released as a function of silver development, and sublimation thermally diffuses the imagewise distribution of the dye or precursor to form an image in the receiving layer of the receiving element, so that the silver A color image is formed by a simple process using only heat, which is an advantage of thermal development, without requiring operations for bleaching, fixing, or desilvering the image. Furthermore, since the dye or precursor is not transferred together with a medium such as a hot solvent, but only the dye or precursor is transferred by itself by sublimation, other additives such as those found in the dye silver salt method are also transferred at the same time. No defects such as color transfer or transfer of color donor substances are observed. As a result of continuing research on the previously proposed technology, the present inventors found that since the dye used to form the image is a sublimable dye, it was found that the image deteriorated over time or due to heat, or that the transfer density decreased. It has been found that there are some inconveniences, such as in some cases being low. In view of the above-mentioned inconveniences and shortcomings, the present inventors conducted extensive research on the image-receiving layer of an image-receiving element used in thermal development color diffusion transfer photography, and arrived at the present invention. A first object of the present invention is to provide an image-receiving element that can overcome the various drawbacks of the conventional heat-developable photographic materials and the techniques previously proposed by the present inventors. A second object of the present invention is to provide an image-receiving element that can produce clear color images and suppress deterioration of image density after image formation. The above object of the present invention is to provide a heat-developable photosensitive element having a layer containing a color-providing substance capable of releasing a sublimable dye or a sublimable dye precursor by thermal development, at least in a stacked relationship during thermal development. This is achieved by an image-receiving element in a heat-developable photographic material, in which the image-receiving layer constituting the image-receiving element contains a compound represented by the following general formula (1). General formula (1) X-(Y-Z) _o In the above formula (1),
aryl group (including substituted aryl), alkylene group having 1 to 6 carbon atoms (including substituted alkylene), arylene group having 6 to 13 carbon atoms (including substituted arylene), arylene having 6 to 20 carbon atoms alkylene groups (including substituted arylene alkylene),

[Formula] [where R ¹ represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms (including substituted alkyl), or an aryl group having 6 to 13 carbon atoms (including substituted aryl). ],

[Formula] or represents a nitrogen-containing heterocycle, Y is an electron-withdrawing group, preferably -SO ₂ -,
-CO-, -SO-,

[Formula] or

[Formula] [where R' is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms (including substituted alkyl),
or represents an aryl group (including substituted aryl) having 1 to 12 carbon atoms, and m is 1 or 2. ], Z is −CH=CHR ¹ ,

【formula】 or

[Formula] (where W represents a group that can be substituted by a nucleophilic group, preferably a halogen atom or an arylsulfonyloxy group), and n is a positive integer of 1 to 4 (when n is 2 or more, two or more are present). (-Y-Z)- may be the same or different. In the present invention, the compound represented by the general formula (1) is preferably a polymer having a repeating unit represented by the following general formula (2). General formula (2) In the above formula (2), Y and Z have the same meanings as defined in the general formula (1), ^R2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms (including substituted alkyl), L is an alkylene group having 1 to 6 carbon atoms, an arylene group having 6 to 10 carbon atoms,
Arylene alkylene group having 7 to 11 carbon atoms, -
COOR ³ (R ³ is the same alkylene group, arylene group, or arylene alkylene group as defined for L), m is 0 or 1, and m
When is 0, L is −SO ₂ − or

[Formula]. The color-providing substance contained in the photosensitive element used in combination with the image-receiving element of the present invention is preferably a compound represented by the following general formula (3). General formula (3) A-J-B In the above formula (3), A represents a group capable of releasing a sublimable dye or a sublimable dye precursor as a function of thermal development, J represents a divalent bonding group, and B represents a residue of a sublimable dye or a sublimable dye precursor. In addition, the divalent bonding group represented by J is
Part or all of it is released while bound to the sublimable dye or precursor. In general formula (3), particularly preferred as the group capable of releasing a sublimable dye or precursor represented by A are residues of phenol derivatives or 1-naphthol derivatives represented by general formula (4) or (5) below. be. General formula (4) General formula (5)

【formula】

[Formula] In the formula, R ⁴ , R ⁵ , R ⁶ and R ⁷ each represent a hydrogen atom, a halogen atom (preferably a chlorine atom, a bromine atom, or an iodine atom), or an alkyl group (preferably a carbon atom number of 1 to 24). Alkyl group, such as methyl group, ethyl group, t-butyl group, s-octyl group,
pentadecyl group, cyclohexyl group, trifluoromethyl group, benzyl group, phenethyl group, etc.), aryl group (e.g. phenyl group, naphthyl group, tolyl group, mesityl group, etc.), acyl group (e.g. acetyl group, tetradecanoyl group, pivaloyl group) group, benzoyl group, etc.), alkyloxycarbonyl group (e.g., methoxycarbonyl group, benzyloxycarbonyl group, etc.), aryloxycarbonyl group (e.g., phenoxycarbonyl group, p-tolyloxycarbonyl group, α-naphthoxycarbonyl group, etc.) ), alkylsulfonyl groups (e.g., methylsulfonyl groups, etc.), arylsulfonyl groups (e.g., phenylsulfonyl groups, etc.), carbamoyl groups (e.g., methylcarbamoyl group, butylcarbamoyl group, tetradecylcarbamoyl group, N-methyl-N-dodecylcarbamoyl group) group, phenylcarbamoyl group, etc.), acylamino group (e.g. n
-butylamide group, β-phenoxyethylamide group, phenoxyamide group, β-methanesulfonamidoethylamide group, β-methoxyethylamide group, etc.), alkoxy group (preferably an alkoxy group having 1 to 18 carbon atoms) , such as methoxy group, ethoxy group, octadecyloxy group),
It represents a sulfamoyl group (eg, memorsulfamoyl group, phenylsulfamoyl group, etc.), a sulfamino group (eg, methylsulfamino, tolylsulfamino), or a hydroxy group. However, preferably at least one of R ⁴ , R ⁵ , R ⁶ and R ⁷ is a group containing a ballast group that reduces thermal diffusivity, for example, a hydrophilic group such as a sulfo group, a carboxy group, or a hydroxy group. , or a group containing an alkyl group and having 8 or more carbon atoms. Further, R ⁶ and R ⁷ may be bonded to each other to form a saturated or unsaturated condensed ring with a benzene ring, and a particularly preferred condensed ring is a naphthalene ring. Another preferred group represented by A is a 5-pyrazolone derivative represented by the following general formula (6). General formula (6)

[Representative examples of compounds represented by general formula (1)]

Compound (1) CH ₂ = CHSO ₂ CH ₂ CH ₂ SO ₂ CH = CH ₂ Compound (2) (CH ₂ = CHSO ₂ CH ₂ ) ₄ C Compound (3) Compound (4) Compound (5) Compound (6) Compound (7) Compound (8) Compound (9) [Representative examples of polymers having repeating units represented by general formula (2)] In addition, these polymers are disclosed in, for example, Japanese Patent Application Laid-Open No. 1986-
It can be easily synthesized according to the method described in No. 65033. The amount of the compound of the present invention, that is, the compound represented by the above general formula (1) or the polymer having a repeating unit represented by the above general formula (2), is generally 0.1 mg per 100 cm ² although it is not limited. ~500 mg, preferably 0.5 mg to 50 mg. Next, the heat-developable photosensitive element that can be used in combination with the image-receiving element of the present invention will be described in more detail. When a color image with an imagewise distribution is obtained on the image-receiving element of the present invention by heat development, it is placed in a stacked relationship with the heat-developable photosensitive element at least during the heat development. Such photosensitive elements basically have at least one layer (A) provided on a support. The layer (A) comprises in a binder (a) a photosensitive silver halide, (b) a silver salt of an organic compound, (c) a heat developing material such as a developing agent, and (d) a color-providing substance as a function of heat development. Components (a), (b), (c) and (d) may be contained in the same layer or in separate layers as long as they are in a state where they can react with each other. The color-donor substance may be included in the layer, and the color-donor substance reduces the photosensitivity of the combined silver halide if the absorption wavelength of the color-donor substance overlaps the sensitivity wavelength range of the photosensitive silver halide with which it is combined. It is preferable that the compound be contained in a position where there is no light-sensitive silver halide layer, that is, in a layer located on the opposite side to the exposure direction with respect to the photosensitive silver halide layer. However, if the absorption wavelength of the color-providing substance is different from the absorption wavelength of the chelate dye formed in the image-receiving layer and does not overlap with the photosensitive range of the photosensitive silver halide combined with it, the color-providing substance and the photosensitive silver halide can be contained in the same layer. In one embodiment of the present invention, the sublimable dye or sublimable dye precursor released in the thermal development reaction has a low molecular weight, a small dipole moment, and is highly hydrophobic, so that it is difficult to interact with the hydrophilic binder. It is small in size, that is, has low solubility in the hydrophilic binder, and easily diffuses in the hydrophilic binder without the need for a solvent. Therefore, in the present invention, the combination of a sublimable dye or a sublimable dye precursor with a hydrophilic binder is advantageous for diffusion and transfer, i.e. the color from which the sublimable dye or sublimable dye precursor can be released. Preferably, the donor material is added into a hydrophilic binder. When a hydrophilic binder is used in this manner, the color-providing substance is non-diffusible (for example, has a ballast group and/or a hydrophilic group) in order to be non-sublimable in the binder. It is also possible to add a hydrophobic binder to the hydrophilic binder insofar as it does not hinder the non-diffusibility of the color-providing substance and does not hinder the diffusibility of the dye or dye precursor. In a preferred embodiment of the present invention, the heat-developable photosensitive element has a layer (A) consisting of the following three different layers on a support. That is, from three different layers (A) each containing a color donor material releasing a dye or precursor capable of forming a yellow, magenta, and cyan dye image in the image-receiving layer, and a correspondingly spectrally sensitized silver halide. It is made up of
Since the released dye is in a gaseous state,
Only dyes can migrate between the superimposed layers, resulting in a multicolor image without undesirable interlayer effects or other material migration between layers during transfer. The sublimable dye according to an embodiment of the present invention can also be transferred in a gaseous state by sublimating and melting and then vaporizing, and vaporization accompanied by melting is also included in sublimation and transfer in the photosensitive element according to the present invention. be done. In addition to the layer (A) containing the photosensitive layer, the heat-developable photosensitive element used in combination with the image-receiving element of the present invention may optionally include a subbing layer, an intermediate layer, a protective layer, a reflective layer, etc. It's okay. The photosensitive element used in combination with the image receiving element of the present invention will be further described. Examples of organic silver salts include organic acid silver salts such as gallic acid silver salt and oxalic acid silver salt, especially silver behenate,
Fatty acid silver salts such as stearic acid silver salt and palmitic acid silver salt, imidazole silver salt, benzotriazole silver salt, 4-sulfobenzotriazole silver salt, 5-nitrobenzotriazole silver salt, 4-hydroxybenzotriazole silver salt, etc. Nitric acid silver salt, thione silver salt, saccharin silver salt, 5-
Examples include chlorsalicylaldoxime silver salt. Examples of the photosensitive silver halide include silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide, silver chlorobromoiodide, and mixtures thereof.
The above-mentioned photosensitive silver halide can be prepared by any method known in the photographic field, such as a single-jet method or a double-jet method. Silver halide gelatin emulsions prepared according to suitable techniques give favorable results. The photosensitive silver halide described above may also be chemically sensitized by any method known in the photographic field. Such sensitization methods include gold sensitization, sulfur sensitization, gold-sulfur sensitization,
Examples include reduction sensitization. This photosensitive silver halide may have coarse or fine grains, but the preferred grain size is a major axis of about 1.5 microns to about 0.001 microns, more preferably about
0.5 micron to about 0.05 micron. Furthermore, as another method for preparing photosensitive silver halide, a photosensitive silver salt-forming component may be allowed to coexist with an organic silver salt to form a photosensitive silver halide in a portion of the organic silver salt. The photosensitive silver salt forming component is a halogen releasing agent, and this method is well known in the field of heat-developable photosensitive materials. Developers generally include phenols, sulfamide phenols, polyhydroxybenzenes, naphthols, hydroxybinaphthyls, methylene bisnaphthols, methylene bisphenols, ascorbic acids, 3-pyrazolidones,
Examples include pyrazolines and pyrazolones, and in the present invention, developers capable of oxidative coupling or diazo coupling with the color-providing substance, such as aminophenols, paraphenylene diamines, sulfoamide anilines, and hydrazones, are used. It can be used alone or in combination with the developer described above. The photosensitive element used in combination with the image-receiving element of the present invention may contain additives in its photosensitive layer or other photographic constituent layers, if necessary. Additives include oxidizing agents, activators, stabilizers,
Examples include color toning agents, chemical sensitizers, thermal fog inhibitors, development regulators, printout inhibitors, spectral sensitizers, filter dyes, and antihalation dyes. Regarding these and binders, please refer to Research Disclosure No. 17029.
(1978), and these can be used. Various binders can be used in the photosensitive element according to the present invention. Examples include proteins such as gelatin, gelatin derivatives, casein, sodium caseinate, and albumin, cellulose derivatives such as ethylcellulose, polysaccharides such as dextran and agar, natural substances such as gum arabic and gum tragacanth, and the dimensional stability of photographic materials. These include latex-like vinyl compounds and synthetic polymers such as those described below. For example US Patent No. 3142586
No. 3193386, No. 3062674, No. 3062674, No. 3193386, No. 3062674, No.
Examples include those described in the specifications of No. 3220844, No. 3287289, and No. 3411911. Examples of useful polymers include water-insoluble polymers based on alkyl acrylates, methacrylates, acrylic acid, sulfoalkyl acrylates or methacrylates. In addition, polyvinyl butyral, polyacrylamide, cellulose acetate butyrate, cellulose acetate propionate, polymethyl methacrylate, polyvinyl pyrrolidone, polystyrene, ethyl cellulose, polyvinyl chloride, chlorinated rubber polyisobutylene, butadiene styrene copolymer,
Vinyl chloride-vinyl acetate copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, polyvinyl alcohol,
Examples include polyvinyl acetate, benzylcellulose, cellulose acetate, cellulose propionate, and cellulose acetate phthalate. Preferred hydrophilic binders that can be used in the photosensitive element of the present invention to non-diffuse the color-providing substance and diffuse the released sublimable dye or sublimable dye precursor include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxy Propyl cellulose, carboxymethyl cellulose, polyethylene glycol,
Polyethylene glycol ester, sodium alginate, propylene glycol alginate, polyvinyl alcohol, water-soluble polyvinyl butyral, polyvinylpyrrolidone, starch, agar,
Examples include dextran and gelatin. If necessary, two or more types may be used in combination. The amount of binder is 1/10 to 10 parts by weight, preferably 1/4 to 4 parts per part of organic silver salt for each photosensitive layer. A general method for forming an image using the image receiving element of the present invention will be described below. (1) A heat-developable photographic material comprising the above-mentioned heat-developable photosensitive element, or a combination of the photosensitive element and the image-receiving element of the present invention (containing an image-receiving layer in a stacked relationship with the photosensitive layer, and a support on the image-receiving layer side) The image-receiving element may be composed of an image-receiving paper having an image-receiving layer or an image-receiving paper.Furthermore, the image-receiving element made of the image-receiving layer or image-receiving paper may be stacked during thermal development as described in (2) below. After cutting to a certain size, the image is exposed. Light sources for image exposure include sunlight, tungsten lamps, fluorescent lamps, mercury lamps, halogen lamps, xenon lamps, laser light, light emitting diodes,
CRT or OFT (optical fiber tube) can be used. (2) Heat development is carried out at a temperature of about 50-250°C, preferably about 100-200°C, with the photosensitive layer side of the photosensitive element in contact with the image-receiving layer side of the image-receiving element. The heating time is 5 seconds to 180 seconds, preferably 15 seconds to 90 seconds. As the heat development method, all methods applicable to ordinary heat-developable photographic materials can be used. For example, the photographic material may be brought into contact with a heated plate, brought into contact with a heated roller or drum, passed through a high-temperature atmosphere, or using high-frequency heating, or even provided with a conductive layer in the photographic material to conduct electricity. It is also possible to utilize Joule heat generated by a strong magnetic field. The heating pattern in thermal development is not particularly limited;
Although it is possible to preheat in advance and then reheat, continuously raise, lower, or repeat heating at a high temperature for a short time, or at a low temperature for a long time, or even discontinuously, there is a simple pattern. preferable. For heat development, a commercially available heat development machine can also be used. For example, “Image forming
Model 4634 (Sony Tektronix), “Developer Module 277” (3M), “Video Hardcopy Unit NWZ-301” (Japan Radio)
and so on. (3) Subsequently, the image-receiving element containing the image-receiving layer is peeled off from the photosensitive element to obtain a color image fixed on the image-receiving layer. In addition, if printing out the silver image is not a problem, it is possible to obtain a color image with the negative and positive integrated without peeling off the image-receiving layer, but usually after the color image is formed, the image-receiving layer and the photosensitive layer are It is preferable to peel it off. Next, the relationship between the image receiving element including the image receiving layer and the photosensitive element including the photosensitive layer will be explained. The photosensitive element and the image receiving element are in a stacked relationship.
A state where both share a support and form the same coating composition, or a state where both have separate supports and a layer containing a color-providing substance in the light-sensitive element and an image-receiving layer in the image-receiving element. are in close contact with each other, and furthermore, both have separate supports, and the layer containing the color-providing substance and the image-receiving layer are in an intermediate layer or in a substantially parallel state with a certain gap in between. Show that. If the photosensitive layer and the image-receiving layer are in a stacked relationship, it is possible to form a clear color image by sublimation or transfer. Examples of the present invention are shown below. However, embodiments of the invention are not limited thereto. Example 1 To 7.26 g of 4-hydroxybenzotriazole silver, 24 c.c. of a 25% water-soluble polyvinyl butyral aqueous solution (Sekisui Chemical Co., Ltd., Eslec W201), 116 c.c. of water, and 70 c.c. of methanol were added, and the mixture was processed using an alumina ball mill. The mixture was pulverized and dispersed to obtain a silver salt dispersion. To 25 c.c. of this silver salt dispersion, add 0.21 g of phthalic acid, 0.16 g of phthalazine, and 0.95 g of the exemplary color-providing substance CPM-(2).
g, 0.42 g of the following developer, 5 c.c. of a 25% aqueous solution of water-soluble polyvinyl butyral, 10 c.c. of water, and 36 mg of silver iodide gelatin emulsion with an average particle size of 0.04 μm in terms of silver were added. A sample of a photosensitive element having a photosensitive layer was obtained by applying the photosensitive layer onto baryta paper using a wire bar so that the wet film thickness was 55 μm. developer The dried sample was exposed to 50,000 CMS of white light through a step wedge. On the other hand, 4% of the exemplified compound (1) represented by general formula (1)
and 8% cellulose diacetate (degree of acetylation 60
Prepare an acetone solution containing
A sample of image-receiving paper (image-receiving element) having an image-receiving layer containing compound (1) was obtained by coating the compound in an amount of 1.5 g. Washi paper was sandwiched between the photosensitive layer-coated surface of the exposed photosensitive element sample and the image-receiving layer-coated surface of the image-receiving paper sample, and after pressing and heating for 30 seconds with an iron with a surface temperature of 150°C, both were heated. The sample was torn off. An orange step wedge image with a maximum reflection density of 1.25 and a minimum reflection density of 0.13 was obtained on the surface of the receiver paper. Comparative Example 1 As an image-receiving paper (image-receiving element), an image-receiving paper (from which compound (1) was removed from the image-receiving paper of Example 1) was made by applying 3.0 g of cellulose diacetate per square meter on ivory paper. In combination with a photosensitive element sample having the same composition as in Example 1, exposure and thermal development were performed in the same manner as in Example 1, and when the receiver paper was peeled off, only an image with a maximum reflection density of 0.94 and a minimum reflection density of 0.11 was obtained. I couldn't get it. Example 2 4.5 g of silver behenate, 20 ml of alcohol, 5 ml of water, and 15 ml of a 25% aqueous solution of water-soluble polyvinyl butyral.
Add to the dispersion using an ultrasonic homogenizer.
[1] was prepared. Meanwhile, 0.20 g of phthalic acid, 0.13 g of phthalazine, 1.12 g of the above-mentioned exemplary color donor CPM-(3), and 2.55 g of the following developer were mixed with 40 c.c. of a water-soluble polyvinyl butyral 8% water-alcohol (1:1) solution. Ball mill dispersion was performed for 24 hours to obtain solution-[1]. developer Further, silver trifluoroacetate and lithium bromide were reacted in a 10% by weight polyvinyl butyral acetone solution to obtain emulsion-[1]. Dispersion - [1] 20 mg of mercuric acetate was added to 10 c.c. Finally, solution-[1] was added and coated onto a transparent polyester film with a wire bar to a wet film thickness of 74 μm to form a photosensitive layer. A white reflective layer having the following composition and an image receiving layer having the following composition containing the compound (2) are coated thereon, and another transparent polyester film is adhered onto the image receiving layer to form a photosensitive element/image receiving element. A photosensitive material sample of the body shape was obtained. [White reflective layer] (Unit: g/m ² ) Titanium dioxide (average particle size: 1.5μ) 15 Cellulose diacetate 1.2 Sodium dodecyl sulfate 0.08 Ethanol 25 Water 30 [Image-receiving layer] (Unit: g/m ² ) Compound (2) 1.0 Cellulose diacetate 2.0 Acetone 30 The photosensitive layer side of this sample was exposed to white light at 50,000 CMS through a step wedge, and the photosensitive layer side was pressed with an iron having a surface temperature of 120° C. for 30 seconds. A negative silver image and a positive image of the unreacted color-providing substance were formed in the photosensitive layer, and a magenta image with a maximum reflection density of 0.93 and a minimum reflection density of 0.07 was obtained in the image-receiving layer. Comparative Example 2 The same sample as in Example 2 was prepared except that the image-receiving layer in Example 2 except that compound (2) was removed was used as the image-receiving layer in Example 2, and the sample was exposed in the same manner as in Example 2. When thermally developed, a magenta image with a maximum reflection density of 0.62 and a minimum reflection density of 0.06 was obtained. Example 3 A performance test of the image-receiving layer was conducted as follows. Samples Nos. 1 to 6 of image-receiving paper (using ivory paper as a support) containing an image-receiving layer having the following composition were prepared. Compound or polymer of the present invention 15 g/m ² Cellulose diacetate 3.0 g/m ² Acetone as coating solvent 60 ml/m ² Receiving paper sample No. Compound of the present invention 1 Compound (1) 2 〃 (3) 3 〃 (4) 4 〃 (9) 5 Polymer (1) 6 (Comparative example) None (cellulose diacetate only) Next, dyes (A) to (C) having the following structure were coated on ivory paper in the following composition. Pigment [(A) to (C)] 1.5 g/m ² Polyvinyl butyral 4.0 g/m ² Acetone (coating solvent) 60 ml/m ² The coated side of the ivory paper containing the above dye is overlapped with the image-receiving layer coated side of the image-receiving paper sample, and the back side of each dye-containing paper is heated with an iron at a surface temperature of 150°C for 30 seconds to transfer the dye to the image-receiving paper. , measure the reflection density of each transferred image using a Sakura photodensitometer.
Measured with FIA-60 type. Furthermore, the image of the image-receiving paper sample onto which the dye had been transferred was superimposed on the ivory paper, and after heating from the back side of the image-receiving paper sample with an iron at a surface temperature of 150°C for 2 minutes,
The remaining dye image density was measured (higher density indicates better fixation). These results are shown in Table-1 and Table-2.

【table】

[Table] As is clear from Table 1, when a layer containing the compound of the present invention is provided as an image-receiving paper (image-receiving element),
The transferred image density is significantly improved, and as is clear from Table 2, it can be seen that the deterioration of the image density due to re-sublimation of the dye is suppressed. In addition, almost no concentration deterioration over time was observed. On the other hand, it can be seen that in the image receiving paper sample No. 6 which does not contain the compound of the present invention, the transfer density is low and the density deterioration due to heat and time is also significant. From these results, according to the present invention, stable color images can be obtained by simple processing using only heat.
Furthermore, it can be seen that an image-receiving element in a heat-developable photographic material is provided, which allows stable multicolors to be obtained.

Claims (1)

[Scope of Claims] 1. A heat-developable photosensitive element having a layer containing a color-providing substance capable of releasing a sublimable dye or a sublimable dye precursor upon thermal development, at least in a stacking relationship during thermal development. In the image receiving element in
An image-receiving element in a heat-developable photographic material, wherein an image-receiving layer constituting the image-receiving element contains a compound represented by the following general formula (1). General formula (1) X-(Y-Z) _o [wherein,
alkylene group having 6 to 13 carbon atoms, arylene group having 6 to 20 carbon atoms, [Formula] (where R ¹ is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a carbon atom number 6 to 13 aryl group (the same applies to R ¹ below), a quaternary carbon atom, or a nitrogen-containing heterocycle, Y represents an electron-withdrawing group, Z is -CH=CHR ¹ ,
[Formula] (where W represents a group that can be substituted by a nucleophilic group) or [Formula], and n represents a positive integer of 1 to 4. ]