JPH0930128A - Image forming assembly, image receiving material and multicolor image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming assembly and an image receiving sheet advantageous in the formation of a color image excellent in the approximation of printed matter such as the quality feeling reproduction of printing main paper and the gloss or the like of an image. SOLUTION: An image forming assembly consists of an ink sheet and an image receiving sheet and the ink sheet has an ink layer containing 30-70wt.% of pigment particles and 25-60wt.% of an amorphous polymer with a softening point of 40-150 deg.C and having a thickness of 0.2-1.0μm and the image receiving sheet consists of a support sheet, and an intermediate layer containing a polymer and a fluorine group-containing surfactant and an image receiving layer. A multicolor image is formed by using the image receiving sheet and the image forming assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming assembly, an image receiving sheet, and a multicolor image forming method which can be advantageously used in a thermal transfer recording system.

[0002]

2. Description of the Related Art In recent years, with the progress of OA, copiers and printers using various recording systems such as an electrophotographic system, an ink jet system, and a thermal transfer recording system have been used in accordance with their respective applications. For this image formation, a coloring material is used, and usually, a composition containing the coloring material is melted, or the coloring material is evaporated or sublimated, and a recording medium such as a paper or a film sheet is formed by the action of adhesion, adsorption, dyeing and the like. And so on.

Of these, the thermal transfer recording method has advantages such as easy operation and maintenance, downsizing of the apparatus and cost reduction. The following two types of thermal transfer recording methods have been conventionally known. That is, a heat-melting type in which a transfer sheet having a meltable ink layer on a support is heated imagewise (imagewise) by a laser or a thermal head to melt-transfer the meltable ink to a heat-sensitive transfer recording image-receiving sheet. A thermal transfer recording ink sheet (or an ink sheet) having a transfer system and an ink layer containing a thermal diffusible dye (sublimable dye) on a support is used to form the thermal diffusible dye on the image receiving sheet for thermal transfer recording. Is a sublimation type dye transfer system for diffusion transfer.

In the sublimation type dye transfer system, the gradation of an image can be controlled by changing the transfer amount of the dye in accordance with the change in the thermal energy of the thermal head.
By performing the superimposition recording of magenta and yellow, there is an advantage that a color image having a continuous change in color density can be obtained. However, this method mainly reproduces the gradation of the image by using the density gradation, and is suitable for some purposes for consumers who prefer the gradation similar to that of a photograph. It also has drawbacks such as not being suitable for color proofing applications used in the printing field where tone reproduction is performed only with tones.

On the other hand, the heat-melt type transfer method has advantages such as high heat sensitivity, excellent light resistance of an image, and low cost of materials as compared with the sublimation type dye transfer method, but gradation reproduction is possible. Is inferior in multi-gradation because it is binary recording instead of density gradation.Also, since a low melting point crystalline wax is usually used as the binder of the ink layer, the resolution decreases due to bleeding during thermal printing, and transfer There are drawbacks such as low image strength, and the use of crystalline waxes makes it difficult to obtain a transparent image due to light scattering of the crystal phase.

In view of such circumstances, the inventor of the present invention is different from the conventional sublimation type dye transfer system and heat melting type transfer system.
As a new heat-sensitive recording material capable of obtaining a multi-gradation pigment color image only with area recording of binary recording, a heat-adhesive thin film peeling method has been previously proposed (see JP-A-7-117359).
According to this method, a multi-tone high-quality color image or monochrome image, in which the problems of the conventional thermal transfer recording method are greatly improved, is achieved by the pigment transfer method of area gradation only. Not only in the printing field, it is possible to develop into the card field, outdoor display field, meter display field, etc. by utilizing the light resistance of color proofs, block manuscripts, and pigments.

[0007] On the other hand, various proposals have been made for the material to be transferred (image receiving medium) used in these various thermal transfer recording materials. When plain paper is used as an image receiving medium of the sublimation dye transfer system, not only dyeing is difficult to occur and the density of a recorded image is low, but also a remarkable fading phenomenon occurs over time. Therefore, an image receiving paper in which an image receiving layer containing a thermoplastic resin as a main component is provided on plain paper has been proposed, and various improvements in recording sensitivity, resolution, sharpness, color density, etc. have been studied.

As for the material to be transferred by the heat-melt transfer method, it is possible in principle to use plain paper, but defects such as uneven transfer and missing dots occur due to the smoothness of the transfer surface and the ink acceptability. It is easy and difficult. Therefore, various image receiving materials have been studied in order to improve surface smoothness, ink transfer acceptance, fixing ability, gradation, sharpness, and the like. Here, as a support for these various image receiving media, a dedicated transfer material such as plain paper, synthetic paper, a synthetic resin film or a white base filled with a white pigment is used. Therefore, in this method, the transferable material capable of forming an image is limited to a dedicated paper or a resin sheet provided with an image receiving layer, so that the quality is insufficient for proof use requiring a printed matter approximation. . Further, a method of transferring a recorded image to any desired transfer-receiving support is also known. JP 52
Japanese Patent Publication No. 27642 describes a method in which a transfer layer (ink layer) is heated and adhered to an intermediate receptor and then the adhered transfer material is transferred to a transfer target material such as paper. Nothing is said about control of transcription and transcription.

Further, in order to improve the cushioning property of the intermediate receptor to improve recording sensitivity, dot quality and gradation reproducibility, it is possible to add a plasticizer to the intermediate receptor to control the cushioning property. Although the cushioning property can be satisfied by blending such a plasticizer or other binder in order to improve the cushioning property of the intermediate receptor, the elasticity and the tackiness of the cushion layer are greatly increased, and the transfer layer and the support are There was a big problem that the adhesion between the layers was increased and the transferability to the final support was deteriorated.

On the other hand, Japanese Patent Publication No. 7-19052 discloses that
A two-layer image-receiving sheet for receiving an image layer formed on a transferable light-sensitive material is disclosed, and Example 1 thereof is disclosed.
In the above, in the receiving layer, Fluoride FC-430 (manufactured by 3M Company), which is a fluorine-based nonionic surfactant, is added. However, when an image-receiving sheet having an image-receiving layer containing this surfactant is used, the interlayer adhesion decreases as the amount of the surfactant added increases, but not only at the interface with the image-receiving layer, but also as an added layer. The adhesion between the support and / or the lower layer (for example, the cushion layer) is reduced,
Problems such as film peeling may occur.

[0011]

SUMMARY OF THE INVENTION The main object of the present invention is to remedy the above drawbacks. That is, the present invention utilizes a pigment transfer system only for area gradation, and is excellent in recording sensitivity, dot quality, and gradation reproducibility, and particularly, it is possible to transfer the transfer layer of the image receiving sheet to the final support and the actual printing paper. (EN) Provided are an image forming assembly (kit) and a thermal transfer recording image receiving sheet which can easily form a multi-gradation high quality color image without dust defects. It is an object of the present invention to provide an image forming assembly and an image-receiving sheet which are excellent in printed matter approximation such as reproduction of texture of printing main paper, gloss of image, and the like because transfer to the actual printing paper is possible. is there. Another object of the present invention is to provide a multicolor image forming method using the above image forming assembly or image receiving sheet.

[0012]

The present invention is an image forming assembly comprising an ink sheet and an image receiving sheet, the ink sheet comprising a support sheet, 30 to 70% by weight of pigment particles and 25 to 70% by weight of pigment particles. An ink layer having a thickness of 0.2 to 1.0 μm containing 60% by weight of an amorphous polymer having a softening point of 40 to 150 ° C., and the image-receiving sheet contains a support sheet, a polymer and a fluorine group. An image forming assembly comprising an intermediate layer containing an anionic surfactant and an image receiving layer. The present invention also resides in an image-receiving sheet comprising a support sheet, an intermediate layer containing a polymer and a fluorine group-containing anionic surfactant, and an image-receiving layer.

Both the image-forming assembly and the image-receiving sheet of the present invention can be used particularly advantageously in a multicolor image forming method comprising the following steps. 1) a support sheet, 30 to 70% by weight of pigment particles and 2
An ink sheet comprising an ink layer having a thickness of 0.2 to 1.0 μm containing 5 to 60% by weight of an amorphous polymer having a softening point of 40 to 150 ° C., a support sheet, a polymer and a fluorine group-containing anion. A step of forming an image-forming laminate by superposing it on an image-receiving layer of an image-receiving sheet comprising an intermediate layer containing a surface-active agent and an image-receiving layer; 2) a step of image-wise heating the image-forming layered body 3) a step of peeling the ink-sheet support sheet from the image-receiving sheet to leave an ink image on the image-receiving layer; 4) a support sheet, 30 to 70% by weight of pigment particles having a different color from the above, and 25- Softening point of 60% by weight is 4
The thickness including the amorphous polymer of 0 to 150 ° C. is 0.2 to
A step of stacking an ink sheet having an ink layer of 1.0 μm on the ink image on the image receiving layer to form a new image forming laminate; 5) the image forming laminate obtained in the step 4). Image-wise heating the body; 6) removing the ink sheet support sheet from the image-receiving sheet to leave a new ink image on the image-receiving layer; 7) the steps 4) to 6) above Step of forming a multicolor image layer in which ink images of three colors or four colors are laminated on the image receiving layer of the image receiving sheet by repeating once or twice; 8) Multicolor image layer obtained in step 7) Superimposing the image-receiving sheet on the final image support so that the multicolor image layer contacts the surface of the final image support; and 9) peeling off the support sheet of the image-receiving sheet together with its intermediate layer, and finally On the image support, a multicolor image and The process of leaving the image receiving layer together.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A material which is chemically and thermally stable and has flexibility is used as a support sheet of an image receiving sheet. If necessary, it may be actinic light transparent. Specific examples thereof include polyolefins such as polyethylene and polypropylene, polyvinyl halides such as polyvinyl chloride and polyvinylidene chloride, cellulose derivatives such as cellulose acetate, nitrocellulose and cellophane, polyamides, polystyrene, polycarbonate and polyimides. Examples of such films include papers laminated with polyethylene film, etc., depending on the case. Particularly preferred among these are:
The biaxially stretched polyethylene phthalate film is excellent in dimensional stability and permeability, but is not limited thereto.

At least an intermediate layer (may be a single layer or multiple layers) and an image receiving layer are provided on the above-mentioned support sheet, but preferably one intermediate layer (hereinafter also referred to as a cushion layer) in contact with the support sheet. And an image receiving layer provided thereon. In order to increase the adhesive strength between the support sheet and the intermediate layer, it is possible to provide the support sheet with a surface treatment such as corona discharge treatment or glow discharge treatment, or to provide an undercoat layer. The undercoat layer may be any as long as it enhances the adhesive force between the support and the intermediate layer, but a coating layer of a silane coupling agent or the like is particularly preferable.

The intermediate layer is a layer containing an organic polymer as a main component, and its Young's modulus (room temperature) is 10 kg · f /
It is preferably from cm ² to 10,000 kg · f / cm ² or less. The reason for this is that the use of an organic polymer material having a small Young's modulus makes the intermediate layer have cushioning properties and can improve the recording sensitivity, dot quality, and gradation reproducibility. Further, even when foreign matter such as dust is present between the ink sheet and the image receiving sheet during recording, there is an advantage that image defects are less likely to occur due to the cushioning property of the intermediate layer. In addition, after transferring the image to the image receiving sheet, when retransferring onto a printing paper such as paper with heat and pressure, the intermediate layer is embedded according to the unevenness of the paper, so that the adhesion with the paper is improved,
Even if the surface of the image-receiving layer that is transferred together with the image on paper is not subjected to a special treatment such as matting, an image having a surface gloss similar to that of a printed matter can be obtained. Particularly preferred Young's modulus (room temperature)
Is 10 kg · f / cm ² to 200 kg · f / cm ² , and in this range, the film thickness of the intermediate layer can be suppressed to 50 μm or less, which is advantageous during manufacturing coating.

Specific examples of the material for the intermediate layer include polyolefins such as polyethylene and polypropylene, ethylene / vinyl acetate copolymers, ethylene copolymers such as ethylene / acrylic ester copolymers, polyvinyl chloride and vinyl chloride. Organic polymers such as copolymers, polyvinylidene chloride, vinylidene chloride copolymers, poly (meth) acrylic acid esters, copolymerized nylon, polyamide resins such as N-alkoxymethylated nylon, synthetic rubbers, chlorinated rubbers, etc. be able to. Of these,
Vinyl chloride / vinyl acetate copolymers, vinyl chloride / vinyl alcohol copolymers, vinyl chloride / vinyl acetate / maleic acid copolymers, vinyl chloride / vinyl acetate / vinyl alcohol copolymers having a degree of polymerization of 200 to 2000, Alternatively, any of vinyl chloride / vinyl acetate / hydroxyalkyl acrylic acid ester, or a combination thereof is preferable. The reason is that the vinyl chloride copolymer of
(1) Almost no tackiness at room temperature, (2) Elastic modulus is relatively small, and it is possible to easily follow unevenness of transferred image during thermal transfer, (3) Abundant plasticizer with good compatibility It is easy to control the substantial elastic modulus, and (4) it is easy to control the interlayer adhesion force by the effect of the hydroxyl group or the carboxyl group in the copolymerization component.

In the present invention, when the image received by the image-receiving layer is retransferred to the permanent support (final image support), the intermediate layer remaining on the support side of the image-receiving sheet contains a fluorine group-containing anion system. A surfactant has been added. Examples of the fluorine group-containing anionic surfactant include perfluoroalkyl sulfonates, perfluoroalkyl phosphates, perfluoroalkyl carboxylates, perfluoroalkylamino sulfonates, and esters thereof. Among these, from the compatibility with the material of the intermediate layer (cushion layer) and the solubility in the coating solvent,
Sulfonic acid-based and phosphate-based compounds, particularly sulfonic acid-based compounds are preferred.

Usually, a fluorinated surfactant is often used for the purpose of leveling, and since the surfactant migrates to the upper and lower layers, the adhesive force between the two often decreases. In the case of the fluorine group-containing anionic anionic surfactant useful in the present invention, addition of a small amount to the intermediate layer has a great effect of lowering the adhesive force with the image receiving layer. Fluorine-containing sulfonic acid-based surfactants useful in the present invention include _Rf- S
It is represented by the structural formula of O ₃ Na ⁺ (R _f is a perfluoroalkyl group).

In order to adjust the adhesive force with the image receiving sheet support and the adhesive force with the image receiving layer, various polymers, adhesion improvers or other surfactants, releasing agents, etc. are added to the intermediate layer. Is also possible. For the purpose of lowering the elastic modulus, it is also very effective to use a part of the tacky polymer in combination as long as the tackiness does not occur at room temperature.

When a vinyl chloride resin is used, an organotin stabilizer such as a butyltin stabilizer or an octyltin stabilizer which is generally known as a stabilizer for polyvinyl chloride and vinyl chloride copolymers is used. It is also effective to add.

Among the various organic polymer substances mentioned above, some have a large Young's modulus and have insufficient cushioning properties. In this case, a plasticizer or the like is added to supplement the cushioning properties. . Examples of the plasticizer having a molecular weight of 1,000 or more and less migrating onto the surface of the image-receiving sheet include a polyester-based plasticizer and a polyfunctional acrylic-based monomer or urethane-based oligomer used as a plasticizer of a monomer. Examples of polyester plasticizers include adipic acid,
There are phthalic acid type, sebacic acid type, epoxy type, trimellitic acid type, pyromellitic acid type, sebacic acid type, citric acid type, but among them, adipic acid type polyester plasticizer, phthalic acid type plasticizer, sebacic acid type plasticizer Agents are preferred. As the polyfunctional acrylate-based monomer, the following 6-functional acrylic monomers and dimethacrylates can be preferably used.

[0023]

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As an example of the urethane-based oligomer, it is possible to use a polymer of general isocyanate and polyether diol or polyester diol, and it is preferable to use an oligomer of aromatic urethane acrylate or aliphatic urethane acrylate. Is.

The above-mentioned plasticizer has the effect of the invention only when a polymer having a molecular weight of 1000 or more and having a good cushioning property is used. When the molecular weight is smaller than this range, the plasticizer tends to migrate onto the surface of the image receiving layer of the image receiving sheet, which increases stickiness on the surface of the image receiving sheet, causing problems such as sticking and dust defects. Also, the molecular weight is not necessarily large, and compatibility with the binder is important. As the molecular weight becomes large, it becomes difficult to be compatible with various binders, and the cushioning property becomes poor, so the film thickness must be increased. Such problems arise. The molecular weight of the added plasticizer is preferably 5000 or less.

Further, if necessary, by adding acrylic rubber or linear polyurethane as an auxiliary binder to a layer of the intermediate layer which requires cushioning properties, the amount of the plasticizer added can be reduced and the surface of the plasticizer can be reduced. It is possible to suppress bleeding to the surface and prevent deterioration of adhesion resistance due to dust defects and deterioration of surface tackiness.

The thickness of the intermediate layer is preferably 1 μm to 50 μm, particularly preferably 5 μm to 30 μm. One of the reasons for this is that when the image transferred on the image receiving sheet is transferred to the permanent image support, it must be thicker than the irregularities on the surface of the permanent image support. The second reason is a four color image. This is because it is necessary to have a thickness that can sufficiently absorb the relief step in the overlapping portion. The third reason is to obtain sufficient cushioning property.

Next, the image receiving layer provided thereon will be described. The purpose of the image-receiving layer is to peel off the image-receiving sheet after retransfer to the permanent image support to cause delamination between the intermediate layer and the image-receiving layer, and to form a thin image-receiving on the surface of the image on the permanent image support. It is intended to obtain an image close to the gloss of an actual printed matter without leaving a special matting treatment by leaving the layers alone and making the unevenness of the permanent image support. A second object is to improve the scratch resistance of the image transferred on the permanent image support. Although various substances can be basically used as the material of the image receiving layer, polyvinyl butyral resin or its modified product (eg, cyclohexyl isocyanate modified product) is preferable as the organic polymer substance constituting the image receiving layer. It is also preferable to contain a polymer (polymer compound) having the following general formula (1) as a repeating unit. General formula (1)

[0029]

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In the general formula (1), R ¹ represents a hydrogen atom or a methyl group, and A represents a substituent having an amide bond or a nitrogen-containing heterocycle. The polymer compound represented by the general formula (1) is obtained by polymerizing the monomer represented by the general formula (2) by a conventional method in a suitable solvent or without a solvent in the presence of a polymerization initiator, or by co-polymerization with another monomer. Obtained by polymerizing. General formula (2)

[0031]

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In the general formula (2), R ¹ and A have the same meanings as in the general formula (1). When A is a substituent having an amide bond, examples of the substituent include CONHR ² and CON.
R ² R ³ and the like. R ² and R ³ are each independently hydrogen, or an alkyl group having 1 to 18 carbon atoms, and 6 to 6 carbon atoms.
20 aryl groups (the alkyl and aryl groups may be substituted with one or more of a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, a halogen atom, a cyano group, and a combination of two or more thereof), R ² and R ³ combine to form an alkylene or aralkylene having 1 to 20 carbon atoms (the alkylene,
Aralkylene may have a branch and may include an ether bond, —OCO—, —COO—, and a combination of two or more thereof. When A is a nitrogen-containing heterocycle, examples thereof include imidazoles, pyrrolidones, pyridines, carbazoles, etc., and these include an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 10 carbon atoms, a halogen atom, It may be substituted with a cyano group and a combination of two or more thereof.

A more preferable range of A is CONHR ⁴ , CONR ⁴ R ⁵ (R
⁴ , R ⁵ are each independently a substituent represented by hydrogen or an alkyl group having 1 to 10 carbon atoms and an aryl group having 6 to 15 carbon atoms (the alkyl or aryl group is a hydroxy group or an alkoxy group having 1 to 6 carbon atoms). A group is preferable, and when A is a nitrogen-containing heterocycle, imidazoles and triazoles are preferable. They may be substituted with an alkyl group having 1 to 5 carbon atoms or an aryl group having 6 to 10 carbon atoms.

Specific examples of the compound represented by the general formula (2) include:
(Meth) acrylamide, N-alkyl (meth) acrylamide (as the alkyl group, for example, methyl group, ethyl group, propyl group, butyl group, t-butyl group, heptyl group, octyl group, ethylhexyl group, cyclohexyl group, hydroxy group Ethyl group, etc.), N-aryl (meth) acrylamide (aryl groups include, for example, phenyl group, tolyl group, nitrophenyl group, naphthyl group, hydroxyphenyl group, etc.), N, N-dialkyl (meth) Acrylamide (as the alkyl group, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, ethylhexyl group,
Such as cyclohexyl group), N, N-diaryl (meth) acrylamide (the aryl group includes, for example, a phenyl group), N-methyl-N-phenyl (meth) acrylamide, N-hydroxyethyl-N-methyl. (Meth) acrylamide, N-2-acetamide, ethyl-N-acetyl (meth) acrylamide, N- (phenylsulfonyl) (meth) acrylamide, N- (p
-Methylphenylsulfonyl) (meth) acrylamide, 2 and 3 and 4-hydroxyphenylacrylamide, (meth) acryloylmorpholine, 1-vinylimidazole, 1-vinyl-2-methylimidazole,
Examples thereof include 1-vinyltriazole, 1-vinyl-3,5-dimethylimidazole, vinylpyrrolidone, 4-vinylpyridine and vinylcarbazole.

Specific examples of other monomers copolymerizable with the monomer represented by the general formula (2) include (meth) acrylic acid esters, allyl compounds, vinyl ethers, vinyl esters, Examples thereof include compounds having a polymerizable unsaturated bond selected from styrenes and crotonic acid esters. Specifically, (meth) acrylic acid esters, for example, alkyl (meth) acrylate, or substituted (meth) alkyl acrylate, (for example, methyl (meth))
Acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, amyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, ethylhexyl (meth)
Acrylate, octyl (meth) acrylate, t-octyl (meth) acrylate, chloroethyl (meth) acrylate, allyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (Meth) acrylate, 2,2-dimethyl-3-hydroxypropyl (meth) acrylate, 5-hydroxypentyl (meth) acrylate, trimethylolpropane mono (meth) acrylate, pentaerythritol mono (meth) acrylate, benzyl (meth) Acrylate, methoxybenzyl (meth) acrylate, chlorobenzyl (meth) acrylate, furfuryl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, phenoxyethyl ( A) acrylate), aryl (meth) acrylate (eg, phenyl (meth) acrylate, cresyl (meth) acrylate, naphthyl (meth) acrylate, etc.), styrenes such as styrene, alkylstyrene (eg, methylstyrene, dimethylstyrene). , Trimethylstyrene, ethylstyrene, diethylstyrene, isopropylstyrene, butylstyrene, hexylstyrene, cyclohexylstyrene, decylstyrene, benzylstyrene, chloromethylstyrene, trifluoromethylstyrene, ethoxymethylstyrene, acetoxymethylstyrene, etc.), alkoxystyrene ( For example, methoxystyrene, 4-methoxy-3-methylstyrene, dimethoxystyrene, etc., halogenostyrene (eg, chlorostyrene) Dichloro styrene, trichloro styrene, tetra-chlorostyrene,
Pentachlorostyrene, bromostyrene, dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2-bromo-4-trifluorostyrene,
4-fluoro-3-trifluoromethylstyrene etc.), hydroxystyrene etc .; crotonic acid esters,
For example, there are alkyl crotonic acid (eg, butyl crotonic acid, hexyl crotonic acid, glycerin monocrotonate, etc.), (meth) acrylic acid, crotonic acid, itaconic acid, acrylonitrile.

Preferred specific examples of the polymer having the repeating unit represented by the general formula (1) are N, N-dimethylacrylamide / butyl (meth) acrylate copolymer, N, N-dimethyl (meth) acrylamide / 2-ethylhexyl (meth) acrylate copolymer, N, N-
Dimethyl (meth) acrylamide / hexyl (meth) acrylate copolymer, N-butyl (meth) acrylamide / butyl (meth) acrylate copolymer, N-butyl (meth) acrylamide / 2-ethylhexyl (meth)
Acrylate copolymer, N-butyl (meth) acrylamide / hexyl (meth) acrylate copolymer, (meth) acryloylmorpholine / butyl (meth) acrylate copolymer, (meth) acryloylmorpholine / 2-
Ethylhexyl (meth) acrylate copolymer, (meth) acryloylmorpholine / hexyl (meth) acrylate copolymer, 1-vinylimidazole / butyl (meth) acrylate copolymer, 1-vinylimidazole /
2-ethylhexyl (meth) acrylate copolymer, 1
-Vinylimidazole / hexyl (meth) acrylate copolymer and the like can be mentioned. Further, the content of the repeating unit of the general formula (1) in the polymer is preferably 10 to 100 mol%, more preferably 30 to 80 mol%.
The preferred molecular weight range is 1000 to 200,000, and more preferably 2000 to 100,000.

There are various resins which can be used in combination with these resins, for example, polyolefins such as polyethylene and polypropylene, ethylene and vinyl acetate, ethylene and acrylic ester, ethylene copolymers such as ethylene and acrylic acid, and polyvinyl chloride. , Vinyl chloride copolymers such as vinyl chloride and vinyl acetate, polyvinylidene chloride, vinylidene chloride copolymers, polystyrene, styrene copolymers such as styrene and maleic acid ester, vinyl acetate copolymers, modified polyvinyl alcohol, Polyamide resin such as copolymer nylon, N-alkoxymethylated nylon, synthetic rubber, chlorinated rubber, phenol resin,
Epoxy resin, urethane resin, urea resin, melamine resin, alkyd resin, maleic acid resin, hydroxystyrene copolymer, sulfonamide resin, ester gum,
Cellulose resin, rosin and the like can be mentioned.

The polymer having the repeating unit of the general formula (1) is preferably 50% by weight based on the total solid content of the image receiving layer.
It is as follows. A particularly preferred range is 1 based on the total solid content.
0 to 30% by weight.

In addition, other adhesion improvers, release agents, plasticizers, surfactants and the like may be added to these resins in order to satisfy the relationship of the adhesive force at each interface as described later. It is natural.

The coating solvent used for forming the image receiving layer is
It is necessary to use a coating solvent that does not dissolve or swell the resin used for the intermediate layer in order to prevent the intermediate layer and the image receiving layer from being mixed with each other due to the penetration of the coating solvent into the lower layer during coating. For example, when a vinyl chloride resin having a relatively good solubility in various solvents is used for the intermediate layer, it is preferable to use an alcohol-based or water-based coating solvent. The thickness of the image receiving layer is 0.1 μm to 10 μm
Is particularly preferable and 0.5 μm to 5 μm is particularly preferable. If the film thickness is too large, the unevenness of the surface of the permanent image support tends to be impaired, and the glossiness tends to be too high to reduce the approximation of the printed matter.

In order to cause delamination between the organic polymer substance of the intermediate layer and the organic polymer substance of the image receiving layer by peeling the image receiving sheet after transfer to the permanent image support, the adhesion force between the respective layers is required. The balance is important, but in the control of interlayer adhesion, in addition to selection of coating solvent to prevent mixing during multilayer coating, materials such as a combination of hydrophilic polymer and lipophilic polymer or polar polymer and nonpolar polymer Selection, adhesion improver such as silane coupling agent, various additives having release curing of fluorine type or silicone type,
It is effective to add a surfactant, a plasticizer or the like to the intermediate layer or the image receiving layer, but it is particularly preferable to add the above-mentioned fluorine group-containing anionic surfactant to the intermediate layer between the intermediate layer and the support. This is preferable since it is possible to control the interlayer adhesive force only at the interface between the intermediate layer and the image receiving layer without impairing the adhesive force.

An intermediate layer may be provided between the intermediate layer and the image receiving layer for the purpose of adjusting the stability of multi-layer coating and transferability.

Next, a transfer material (ink sheet) having an ink layer capable of thermal transfer, which is useful in the present invention, will be described.

As the support for the ink sheet, various supports known as conventional melt transfer and sublimation transfer supports are used. A polyester film such as a polyethylene terephthalate film subjected to a mold release treatment is particularly preferable.

As the pigment contained in the ink layer of the ink sheet, various known pigments can be used, for example, pigments such as carbon black, azo type, phthalocyanine type, quinacridone type, thioindigo type, anthraquinone type and isoindoline type pigments. Is mentioned. These may be used in combination of two or more, and a known dye may be added for adjusting the hue.

The ink layer of the ink sheet includes, for example, butyral resin, polyamide resin, polyethyleneimine resin, sulfonamide resin, polyester polyol resin, petroleum resin, styrene, vinyltoluene, α-methylstyrene, 2-methylstyrene, chlorostyrene. , Vinyl benzoic acid, sodium vinylbenzene sulfonate, styrene and its derivatives such as aminostyrene, substituted homopolymers and copolymers, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, butyl methacrylate and hydroxyethyl methacrylate, and Acrylic acid esters such as methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate and α-ethylhexyl acrylate, and dienes such as acrylic acid, butadiene and isoprene, Acrylonitrile, vinyl ethers, maleic acid and maleic acid esters, maleic anhydride, cinnamic acid, vinyl chloride, vinyl acetate, and other vinyl monomers alone or as a copolymer with other monomers, etc. An amorphous organic polymer compound having a softening point of 40 ° C to 150 ° C can be used. Two or more kinds of these resins may be mixed and used.

Of these, butyral resin and styrene / maleic acid half ester resin are particularly preferable from the viewpoint of the dispersibility of the pigment, which is one of the features of the present invention described later. The softening point of these resins should be selected in the range of 40 ° C to 150 ° C. If it exceeds 150 ° C, the thermal recording sensitivity is low, and if it is less than 40 ° C, the adhesion resistance of the ink layer is poor.

From the viewpoint of improving the releasability of the ink layer from the support and the thermal sensitivity at the time of thermal printing, various releasing agents and softening agents are added to these ink layers from 1% by weight to the total amount of the ink layer. It is also possible to add in the range of 20% by weight. Specific examples include higher fatty acids such as palmitic acid and stearic acid,
Fatty acid metal salts such as zinc stearate, fatty acid esters or partially saponified products thereof, fatty acid derivatives such as fatty acid amides, higher alcohols, ether derivatives of polyhydric alcohols, paraffin wax, carnauba wax, montan wax, beeswax, Waxes such as wood wax and candelilla wax, viscosity average molecular weight of about 100
0 to about 10,000 low molecular weight polyethylene, polypropylene, polybutylene and other polyolefins, or low molecular weight copolymers of olefin and α-olefins with maleic anhydride, organic acids such as acrylic acid and methacrylic acid, and vinyl acetate. , Low molecular weight oxidized polyolefin, halogenated polyolefins, lauryl methacrylate, stearyl methacrylate, etc. Methacrylic acid ester having long chain alkyl side chain, acrylic acid ester or acrylic acid ester having perfluoro group, methacrylic acid ester alone or styrene etc. Copolymers with vinyl monomers, low-molecular-weight silicone resins such as polydimethylsiloxane and polydiphenylsiloxane, and silicone-modified organic substances, and ammonium salts having long-chain aliphatic groups, pyridinium Cationic surfactants such um salts,
Alternatively, similarly, one or more kinds of anions having a long-chain aliphatic group, nonionic surfactants, perfluoro-based surfactants and the like can be selected and used.

The optical density of these thermally transferable ink layers is preferably such that the reflective optical density thereof is 1.0 or more when transferred onto a white support. If this value is less than 1.0, a sufficient image quality cannot be obtained when used as a color proof, for example. The thickness of the ink layer is 0.2
The range from μm to 1.0 μm is preferred. In a thick ink layer larger than 1.0 μm, in the gradation reproducibility only by area gradation, the shadow part is easily crushed,
The highlight part is easily skipped, resulting in poor gradation reproducibility. On the other hand, if the film thickness is less than 0.2 μm, it becomes difficult to obtain a predetermined concentration. A preferable thickness range is 0.2 to 0.8 μm, and a particularly preferable thickness range is 0.3 to 0.6 μm.

In order to obtain a predetermined concentration with these thin films, the pigment contains 30 to 70 parts by weight of pigment in the ink layer.
It is preferable that the amorphous organic polymer conjugate is 25 parts by weight to 60 parts by weight, and the total amount of the releasable substance and the softener added as needed is 1 part by weight to 15 parts by weight. If the pigment ratio is less than this, it is difficult to obtain a predetermined concentration at the above-mentioned predetermined film thickness. It is preferable that 70% or more of the pigment particles have a particle size of 1.0 μm or less. When the particle size is large, the transparency of the overlapping portion of each color during color reproduction is impaired, and it becomes difficult to satisfy both the relationship between the film thickness and the density.

As the pigment, cyan, magenta, and yellow pigments used for forming an image of a multicolor printed matter in a general printing field are used, and each ink sheet is prepared for each pigment. Is used and used.
A black pigment is also used if necessary. Therefore, a total, three-color or four-color ink sheet is usually facilitated.

Regarding the dispersion of these pigments in the amorphous organic polymer binder (bond or binder), various solvents used in the coating field including ball mills by adding a suitable solvent. Is applied.

The above-mentioned thermally transferable ink layer is mainly composed of a pigment and an amorphous organic polymer combination, and has a higher pigment ratio than the conventional wax-melting type. Does not decrease as much as 10 ² to 10 ³ cps, and at a temperature of 150 ° C. is at least 10
Since it is higher than ⁴ cps, it can be said that the present invention is a thin film peeling development type image formation utilizing the thermal adhesiveness of the image receiving layer of the image receiving sheet, or the thermal adhesiveness between the ink layers in the case of color image formation. . This, combined with the effect of thinning the ink layer, enables a wide range of gradation reproduction from the shadow part to the highlight part while maintaining high resolution.
In addition, by improving the edge sharpness and enabling the transfer of an image of 100%, for example, a small character of 4 points and the uniformity of the density of the solid portion are realized.

As a heat source used for transferring an ink image to an image receiving sheet using the above ink sheet,
When a laser beam is used, it is preferable to provide a photothermal conversion layer (a layer containing a substance that absorbs laser light and generates heat) between the support sheet of the ink sheet and the ink layer. Such photothermal conversion layers are already known.

As described above, both the image-forming assembly and the image-receiving sheet of the present invention utilize a multicolor image forming method comprising the following steps, in particular, a multicolor printed matter produced by producing a color proof. It can be advantageously used for applications such as confirmation before printing. 1) a support sheet, 30 to 70% by weight of pigment particles and 2
An ink sheet comprising an ink layer having a thickness of 0.2 to 1.0 μm (preferably 0.2 to 0.8 μm) containing 5 to 60% by weight of an amorphous polymer having a softening point of 40 to 150 ° C. A support sheet, an intermediate layer containing a polymer and a fluorine group-containing anionic surfactant, and a step of forming an image-forming laminate on the image-receiving layer of an image-receiving sheet comprising the image-receiving layer; 2) image Step of imagewise heating the forming laminate; 3) Step of peeling the ink sheet support sheet from the image receiving sheet to leave an ink image on the image receiving layer; 4) Separately prepared support sheet, and 30- 70% by weight
An ink sheet comprising an ink layer having a thickness of 0.2 to 1.0 μm, which contains pigment particles having a coloring different from the above and 25 to 60% by weight of an amorphous polymer having a softening point of 40 to 150 ° C., Step of superposing on the ink image on the image receiving layer to form a new image forming laminate; 5) Step of imagewise heating the image forming laminate obtained in the above Step 4); 6) Image receiving The step of peeling the ink sheet support sheet from the sheet to leave a new ink image on the image receiving layer; 7) The above steps 4) to 6) are repeated once or twice to obtain an image receiving sheet. Obtained by the step 7) of forming a multicolor image layer in which three color (cyan, magenta, yellow) or four color (cyan, magenta, yellow, black) ink images are laminated on the layer; Image receiving system with multi-color image layer Layer on the final image support so that the multicolor image layer is in contact with the surface of the final image support; and 9) peel off the support sheet of the image-receiving sheet together with its intermediate layer to give the final image support. The process of leaving an image receiving layer with a multicolor image on the body.

As a heat source for the above heating, a thermal head or a laser beam can be advantageously used as described above.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. In the following Examples and Comparative Examples, "parts" means "parts by weight" unless otherwise specified.

[0058]

【Example】

[Synthesis Example 1] <Synthesis of polymer compound (a)> 170 parts of propylene glycol monomethyl ether was heated and stirred under a nitrogen stream at 80 ° C to give 2,2'-azobis (2,4-dimethylvaleronitrile). ) 0.07 part was added and stirred for 30 minutes. Add to this 31.6 parts of butyl acrylate, 24.4 parts of N, N-dimethylacrylamide, 2,2'-azobis (2,4
-Dimethylvaleronitrile) 0.07 part was applied over 30 minutes. 30 minutes and 1 hour after the end of dropping,
0.15 parts of 2'-azobis (2,4-dimethylvaleronitrile) was added, respectively, and the mixture was further heated and stirred for 4 hours to obtain a 28% propylene glycol monomethyl ether solution of the following polymer compound (a). The weight average molecular weight (in terms of polystyrene) was 13,000.

Example 1 (Preparation of Image Receiving Sheet) Coating solutions for the intermediate layer and the image receiving layer having the following compositions were prepared. (Coating liquid for intermediate layer) -Binder PVC / vinyl acetate copolymer 25 parts by weight (MPR-TSL, manufactured by Nisshin Chemical Co., Ltd.)-Plasticizer DPCA-120 (manufactured by Nippon Kayaku Co., Ltd.) 12 parts by weight Part (6-functional acrylate-based monomer, molecular weight 1947) -Surfactant (Brand name Megafac F-110, 0.4 part by weight perfluoroalkyl sulfonate, Dainippon Ink and Chemicals, Inc.)-Solvent Methyl ethyl ketone 75 Parts by weight

(Coating Solution for Image Receiving Layer) Binder Polyvinyl butyral 16 parts by weight (Denka Butyral # 2000-L, manufactured by Denki Kagaku Kogyo Co., Ltd.) Polymeric compound (a) 4 parts by weight Interface Activator (Brand name Megafac F-177P, 0.5 part by weight manufactured by Dainippon Ink and Chemicals, Inc.)-Solvent n-propyl alcohol 200 parts by weight

A polyethylene terephthalate (PET) film having a thickness of 100 μm was placed on a support, and the above coating solution for the intermediate layer was spun at 300 rpm using a spin coater (Whorer).
And then dried in an oven at 100 ° C. for 2 minutes. The thickness of the obtained intermediate layer was 20 μm.

On the above intermediate layer, a spin coater (whaler)
Was used to apply the above-mentioned image-receiving layer coating liquid at 200 rpm, and the coating liquid was dried in an oven at 100 ° C. for 2 minutes. The thickness of the obtained image receiving layer was 2 μm.

(Preparation of Ink Sheet) Next, the following three types of ink layer coating solutions were prepared. Butyral resin 12 parts by weight (Denka Butyral # 2000-L, manufactured by Denki Kagaku Kogyo Co., Ltd.) Pigment ABC ABC cyan pigment (CI.P.B.15: 4) 12 parts by weight Magenta pigment ( C.I.P.R. 57: 1) -12 parts by weight-Yellow pigment (C.I.P.Y.14) -12 parts by weight-Dispersion aid Solspers S-20,000 0.8 parts by weight Part (ICI Japan Co., Ltd.) Solvent n-propyl alcohol 110 parts by weight

0.24 parts by weight of stearic acid amide, n with respect to 10 parts by weight of each of the pigment dispersions A, B and C described above.
-Propyl alcohol 60 parts by weight was added to make a coating solution, and a dry film thickness A of 0.36 µm, B of 0.38 µm, and C were applied to a polyester film (manufactured by Teijin Limited) having a thickness of 5 µm and a release treatment. To be 0.42 μm,
Three types of ink sheets were prepared: a cyan ink sheet, a magenta ink sheet, and a yellow ink sheet.

First, a cyan ink sheet and an image receiving sheet were superposed on each other, and printing was performed by a thermal head recording device (prototype experimental machine) by the sub-scanning division method. This principle is 75μmX50
This is a method of performing multi-step modulation only with area gradation by turning on and off a μm head in a direction of 50 μm with a minute feed of 3 μm pitch. The cyan ink sheet was peeled off, and an image consisting of only area gradation was formed on the image receiving sheet. Next, a magenta ink sheet is superposed on an image receiving sheet on which a cyan image is formed, aligned and printed in the same manner, and the ink sheet is peeled off to form a magenta image and similarly a yellow image on the image receiving sheet. Then, a color image consisting only of area gradation was formed on the image receiving sheet. Next, the image receiving sheet on which the color image was formed was overlaid on the art paper and passed through a heat roller of 4 m / sec at 130 ° C. and a pressure of 4.5 Kg / cm, and then the polyester film of the image receiving sheet was peeled off to form an ink image. The transferred image-receiving layer was transferred to form a multicolor image on art paper. In this multicolor image, the closeness between the color image and the chemical proof (manufactured by Fuji Photo Film Co., Ltd., trade name Color Art) created from the lith original was very good.

The reflection densities of the respective monochromatic colors at this time were as follows.

When the density of 4P characters was measured with a microdensitometer, it was the same as the density of solid areas. The gradation reproducibility was 5% to 95%, which was very good. Further, there was no stickiness on the surface of the image receiving sheet, there were no defects due to dust, the dot shape was good, the surface was matted following the irregularities of the paper, and the surface gloss was an image very similar to that of the printed matter.

Example 2 A perfluoroalkyl sulfonate (F-113, manufactured by Dainippon Ink and Chemicals, Inc.) was used instead of the surfactant F-110 in the intermediate layer of Example 1.
An image-receiving sheet was prepared in the same manner as in Example 1 except that 0.4 part by weight of was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1 and the image was evaluated. Table 1 shows the evaluation results.

Example 3 A perfluoroalkyl phosphate ester (F-191, manufactured by Dainippon Ink and Chemicals, Inc.) was used instead of the surfactant F-110 in the intermediate layer of Example 1.
An image-receiving sheet was prepared in the same manner as in Example 1 except that 0.4 part by weight of was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1 and the image was evaluated. Table 1 shows the evaluation results.

[Comparative Example 1] Instead of the surfactant F-110 in the intermediate layer of Example 1, a nonionic surfactant (NP) was used.
An image receiving sheet was prepared in the same manner as in Example 1 except that -10, manufactured by Nikko Chemicals Co., Ltd. was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1, but as shown in Table 1, the interlayer adhesion was very large and the transferability to art paper was poor.

[Comparative Example 2] A nonionic perfluoroalkylethylene oxide adduct (F-142D, manufactured by Dainippon Ink and Chemicals, Inc.) was used instead of the surfactant F-110 in the intermediate layer of Example 1. An image-receiving sheet was prepared in the same manner as in Example 1 except that 0.4 part by weight of) was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1, but as shown in Table 1, the interlayer adhesion was very large and the transferability to art paper was poor.

[Comparative Example 3] A cationic perfluoroalkyltrimethylammonium salt (F-150, manufactured by Dainippon Ink and Chemicals, Inc.) was used instead of the surfactant F-110 in the intermediate layer of Example 1. An image-receiving sheet was prepared in the same manner as in Example 1 except that 0.4 part by weight of was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1, but as shown in Table 1, the interlayer adhesion was very large and the transferability to art paper was poor.

[Comparative Example 4] In place of the surfactant F-110 of the intermediate layer of Example 1, a nonionic fluorine-containing surfactant Florad FC-430 (manufactured by 3M Company) was used.
An image receiving sheet was prepared in the same manner as in Example 1 except that 4 parts by weight was used. Using this image-receiving sheet, a multicolor image was formed in the same manner as in Example 1, but as shown in Table 1, peeling occurred between the intermediate layer and the cushion layer.

[Comparative Example 5] An image receiving sheet was prepared in the same manner as in Example 1 except that the intermediate layer surfactant F-110 was omitted. A multicolor color image was formed using this image-receiving sheet in the same manner as in Example 1, but as shown in Table 1, the interlayer adhesion was very large and the transferability to art paper was poor.

[0075]

[Table 1] Table 1: Evaluation results ──────────────────────────────── 1st layer / 2nd layer Final support Surfactant to the body Interlayer adhesion g / cm Transferability ──────────────────────────────── Example 1 Par Fluoroalkyl sulfonate 5.0 Easy transfer (F-110) 2 Perfluoroalkyl sulfonate 6.0 Easy transfer (F-113) 3 Perfluoroalkyl phosphate 50.0 Easy transfer (F-191 ) ──────────────────────────────── Comparative Example 1 Nonionic NP-10 2Kg or more Not easily transferred 2 Par Fluoroalkyl ethylene oxide 2Kg or more Partially transferred Adduct (F-142D) 3 Perfluoroalkyltrimethylammonium salt 2Kg or more Partially transferred ( F-150) 4 Florard FC-430 20.0 Cushion layer peeling 5 No additive 2Kg or more Not easily transferred ────────────────────────── ───────

[0076]

INDUSTRIAL APPLICABILITY In the image-forming assembly or image-receiving sheet of the present invention, the interlayer adhesion between the intermediate layer and the image-receiving layer can be reduced without impairing the adhesion between the intermediate layer and the support, and the final support can be obtained. Retransfer to the body is facilitated, and an image with excellent recording sensitivity, dot quality, and gradation is obtained. Therefore,
Since the multicolor color image obtained by the image forming method of the present invention is particularly excellent in closeness to a printed matter and has high quality, it can be advantageously used for applications such as preparation of a color proof.

Claims (14)

[Claims] 1. An image forming assembly comprising an ink sheet and an image receiving sheet, the ink sheet comprising a support sheet, 30 to 70% by weight of pigment particles and 25 to 60% by weight.
And an ink layer having a thickness of 0.2 to 1.0 μm containing an amorphous polymer having a softening point of 40 to 150 ° C., and the image receiving sheet is a support sheet, a polymer and a fluorine group-containing anionic interface. An image-forming assembly comprising an intermediate layer containing an activator and an image-receiving layer. 2. The image forming assembly according to claim 1, wherein the amorphous polymer in the ink layer of the ink sheet is polyvinyl butyral. 3. The thickness of the ink layer of the ink sheet is 0.
The image-forming assembly according to claim 1, which is in the range of 2 to 0.8 μm. 4. The polymer of the intermediate layer of the support sheet is
Vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl alcohol copolymer, vinyl chloride / vinyl acetate / maleic acid copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer or vinyl chloride / vinyl acetate / acrylic acid The image-forming assembly according to claim 1, which contains any one of hydroxyalkyl esters. 5. The fluorine-containing anionic surfactant is
Perfluoroalkyl sulfonate, perfluoroalkyl phosphonate, perfluoroalkyl kill carboxylate, perfluoroalkyl amino sulfonate,
Alternatively, the image-forming assembly according to claim 1, which is an ester thereof. 6. The image forming assembly according to claim 1, wherein the image receiving layer of the image receiving sheet contains the same amorphous polymer as the amorphous polymer of the ink layer of the ink sheet or a modified product thereof. . 7. The image-forming assembly according to claim 1, wherein the image-receiving layer of the image-receiving sheet contains polyvinyl butyral or a modified product thereof. 8. The image forming assembly according to claim 1, comprising at least three color ink sheets of cyan, magenta, and yellow. 9. An image receiving sheet comprising a support sheet, an intermediate layer containing a polymer and a fluorine group-containing anionic surfactant, and an image receiving layer. 10. The polymer of the intermediate layer of the support sheet is a vinyl chloride / vinyl acetate copolymer, a vinyl chloride / vinyl alcohol copolymer, a vinyl chloride / vinyl acetate / maleic acid copolymer, a vinyl chloride / acetic acid. The image-receiving sheet according to claim 9, which is any one of vinyl / vinyl alcohol copolymer, vinyl chloride / vinyl acetate / hydroxyalkyl acrylic acid ester, or a combination thereof. 11. The method according to claim 9, wherein the fluorine-containing anionic surfactant is perfluoroalkylsulfonate, perfluoroalkylphosphonate, perfluoroalkylalkylcarboxylate, perfluoroalkylaminosulfonate, or ester thereof. Image receiving sheet. 12. The image-receiving layer of the image-receiving sheet has a softening point of 4
The image-receiving sheet according to claim 9, which contains an amorphous polymer at 0 to 150 ° C. 13. The image-receiving sheet according to claim 9, wherein the image-receiving layer of the image-receiving sheet contains polyvinyl butyral or a modified product thereof. 14. A method for forming a multicolor image comprising the following steps: 1) a support sheet, 30 to 70% by weight of pigment particles, and 2
An ink sheet comprising an ink layer having a thickness of 0.2 to 1.0 μm containing 5 to 60% by weight of an amorphous polymer having a softening point of 40 to 150 ° C., a support sheet, a polymer and a fluorine group-containing anion. A step of forming an image-forming laminate by superposing it on an image-receiving layer of an image-receiving sheet comprising an intermediate layer containing a surface-active agent and an image-receiving layer; 2) a step of image-wise heating the image-forming layered body 3) a step of peeling the ink-sheet support sheet from the image-receiving sheet to leave an ink image on the image-receiving layer; 4) a support sheet, 30 to 70% by weight of pigment particles having a different color from the above, and 25- Softening point of 60% by weight is 4
The thickness including the amorphous polymer of 0 to 150 ° C. is 0.2 to
A step of stacking an ink sheet having an ink layer of 1.0 μm on the ink image on the image receiving layer to form a new image forming laminate; 5) the image forming laminate obtained in the step 4). Image-wise heating the body; 6) removing the ink sheet support sheet from the image-receiving sheet to leave a new ink image on the image-receiving layer; 7) the steps 4) to 6) above Step of forming a multicolor image layer in which ink images of three colors or four colors are laminated on the image receiving layer of the image receiving sheet by repeating once or twice; 8) Multicolor image layer obtained in step 7) Superimposing the image-receiving sheet on the final image support so that the multicolor image layer contacts the surface of the final image support; and 9) peeling off the support sheet of the image-receiving sheet together with its intermediate layer, and finally On the image support, a multicolor image and The process of leaving the image receiving layer together.