JPH04358151A - Image forming method - Google Patents

Abstract

PURPOSE:To improve the transfer stability of images by using a specific mixture for an image receiving layer of an image receiving sheet which is a temporary transfer material in transferring the images of a photosensitive film consisting of a thermoadhesive layer and a specific photosensitive layer. CONSTITUTION:The thermoadhesive layer which is sealable from a transparent base and consists of a polyester resin having a thermoadhesive property and the photosensitive layer which is formed of modified polyvinyl alcohol having at least one kind of the stylbazolium group and stylquinolinium group expressed by formulas I and II as a photosensitive component addition group are laminated on the transparent base of the photosensitive film. In the formulas I, II, R1 and R2 respectively independently denote a hydrogen atom or alkyl group; Y<-> denotes a conjugated chlorine type ion of an acid. The image receiving layer of the image receiving sheet is formed of a mixture composed of the water dispersion of a resin formed by crosslinking the polymers of a copolymer of polyolefin and alpha,beta-unsatd. carboxylic acid to each other and the dispersion of a resin consisting of a copolymer of ethylene and vinyl acetate.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor image forming method, and more particularly to a multicolor image forming method mainly used for color proofing.

0002

2. Description of the Related Art Hitherto, as a proofing method for color plate making and color printing, there has been known a method of producing a proof print using a printing proofing machine or a printing press. However, producing proofs using these methods is expensive,
Problems include: time-consuming, lack of stability due to small number of copies being printed, furthermore, when using a proofing machine, the finish is different from that of the main printing machine, lack of stability, lack of skilled workers, etc. There is. For this reason, instead of the method of creating proofs using a printing proofing machine or printing machine as described above,
A photographic method using a photosensitive resin has been developed as a method for obtaining multicolor images more easily as an alternative to proof printing. Overlay methods and transfer methods are known among these methods.

[0003] The overlay method is a method in which a color-separated image is formed on a photosensitive sheet comprising a colored photosensitive resin layer on a transparent support, and a proof sheet is obtained by overlapping these images. 11558, special public service 1977-14
326, JP-A-59-65840, JP-A-61-186
954, etc. The overlay method has the characteristics of easy production and low cost, but since transparent supports are overlapped for the number of color separation images to be used, color turbidity and surface gloss due to the coloring of the transparent supports occur. , etc. have the disadvantage that the printed matter is significantly different from the printed matter produced by the main printing machine.

[0004] On the other hand, as a proof printing method using a transfer method, a colored image is sequentially formed on a single opaque support, or a colored image is formed via an image support layer that adheres the colored image and the opaque support. It's a method.

These methods include: 1) A photosensitive adhesive layer whose adhesive properties change due to a photochemical reaction is transferred onto an opaque support by heat and pressure, and after exposure, toner is sprinkled to obtain a color-separated image. Furthermore, a method of forming a multicolor image by repeating the process of similarly transferring a photosensitive adhesive layer thereon and sprinkling toner to form another color separated image (Japanese Patent Publication No. 48-31323, etc.);

0
2) Prepare a photosensitive transfer sheet in which a sensitive or pressure-sensitive adhesive layer, a photosensitive resin layer, a coloring agent layer, or a colored photosensitive resin layer made of a single layer of these are formed on a support, and adhere. After transferring the agent layer, photosensitive resin layer, coloring agent layer, or colored photosensitive resin layer made of these layers onto an opaque support by heat or pressure, a color separation image is formed by exposure and development. Furthermore, by repeating the process of transferring, exposing, and developing an adhesive layer, a photosensitive resin layer, a coloring agent layer, or a colored photosensitive resin layer made of a single layer of these, to form another color-separated image. A method for forming a multicolor image (Japanese Patent Application Laid-Open No. 60-263936, etc.),

3)
A photosensitive transfer sheet comprising a release layer made of an organic polymer and a colored photosensitive resin layer on a support is exposed and developed to form a color separation image on the release layer, and then adhered to an arbitrary support in each color. Method of transferring using an agent (Japanese Patent Publication No. 46-1532
6, Tokuko Sho 49-441),

4) After forming a color-separated image on a photosensitive transfer sheet having a heat-fusible adhesive layer, heat and pressure are applied to the image-receiving sheet, which serves as a dedicated final support, to separate the adhesive layer and How to transfer a separated color image (
JP-A-51-5101, JP-A-60-28649),
A method of transferring directly to printing paper such as coated paper or art paper (
Japanese Patent Publication No. 47-41830),

5) After forming a color separation image on a photosensitive transfer sheet having a heat-fusible adhesive layer, heat the adhesive layers and color separation images of all colors onto an image receiving sheet having a release layer. A method of transferring the adhesive layer of all the colors and the separated color images together with the peeling layer of the image receiving sheet to an arbitrary support by applying heat and pressure 286
857, Japanese Unexamined Patent Publication No. 59-97140), etc. are known.

However, method 1) has the advantage that only one type of photosensitive film is required and images of many tones can be obtained by selecting the tones of the toners used. The final image is formed on a special opaque support, and the final image is formed on a special opaque support. unable to form an image,
There was a drawback.

Method 2) is similar to method 1), although the color tone used is limited to the color of the photosensitive transfer sheet, but it does not require the work of sprinkling toner, and stable density and color tone can be obtained. Exposure and development must be repeated on a dedicated opaque support, and the exposure, development, and transfer steps cannot be performed separately and at the same time, resulting in poor workability. There was a drawback that an image could not be formed on the printing paper.

[0012] Method 3) allows exposure, development, and transfer of each photosensitive transfer sheet to be carried out all at once, but the work is complicated because adhesive must be applied for each transfer of one color, and the adhesive This has the disadvantage that registration must be performed by overlapping the surfaces, making it difficult to perform registration.

[0013] Method 4) simplifies the work because the image is transferred using heat and pressure using a hot adhesive.
There was a drawback that the image was reversed. Furthermore, when a special image-receiving sheet is used, the texture is different from that printed on paper, and when transferred to printed paper, the paper expands and contracts when heated, making it difficult to register.

Although method 5) provides extremely stable transferability, the release layer of the image-receiving sheet remains on the final image, resulting in a surface gloss different from that of the actual print and a dot gain value larger than that of the actual print. It has the following drawback.

Furthermore, as a further development of 5), 6) uses an image receiving sheet in which a thick first layer made of an organic polymer substance and a thin second layer are provided on a support; Similarly, after each color separation image is transferred together with the adhesive layer, the second layer and all the transferred color separation images are transferred to the adhesive layer, or all the transferred color separation images are printed with only the adhesive layer on the main paper. A method that attempts to obtain a finish closer to the actual printed matter by making the layer transferred from the image receiving sheet to the printing paper extremely thin or eliminating it by transfer (Japanese Patent Application Laid-Open No. 61-18
9535),

7) The image receiving layer in 6) above consists of a single layer containing a fluorine-based surfactant, and using an image receiving sheet in which none of the layers coated on the image receiving sheet is transferred to the main printing paper is used, which is closer to the actual printed matter. A method for obtaining a finished product (Japanese Patent Application Laid-Open No. 64-52135) is known.

However, method 6) brings the dot gain closer to that of actual printed matter by making the layer transferred from the image-receiving sheet to the final image extremely thin or eliminating it; If the layer is extremely thin, the transfer process is highly stable, but the thin film will reproduce the relief (unevenness) pattern of the image as it is, resulting in an unnatural surface gloss. If there is no layer to be formed, it is difficult to balance the adhesion between the formed image and the image-receiving layer, and between the area where no image is formed and the image-receiving layer, and the image-receiving layer must be formed of two layers for both. There was also the problem of productivity.

[0018] Method 7) further improves method 6) by making the image receiving layer of the image receiving sheet a single layer, and further eliminating the layer transferred from the image receiving sheet onto the final image, so that the dot gain value is , it is possible to obtain a finished product with a texture etc. that is close to that of the actual printed matter. However, even in 7), it is difficult to balance the adhesion between the formed image and the image-receiving layer, and between the area where the image is not formed (the area where the thermal adhesive layer is exposed) and the image-receiving layer, especially when printing main paper. When the image-receiving sheet is peeled off, the adhesion strength differs between the part where the image is transferred, the part where only the thermal adhesive layer is transferred, and the part where nothing is transferred and only the surface of the image-receiving layer is in contact with the paper. There are problems in that transfer defects and paper smearing are likely to occur. Further, the addition of a fluorine-containing surfactant to the image-receiving layer has the problem that the transferability of the image formed on the photosensitive transfer sheet to the image transfer layer tends to decrease.

[0019]

[Means for Solving the Problems] An object of the present invention is to provide a transparent heat-adhesive layer on a transparent support made of a polyester resin that is releasable from the transparent support and has heat-adhesive properties [However, in the above formula, R1 and R2 each independently represents a hydrogen atom or an alkyl group, Y- represents a conjugated chlorinated ion of an acid, m represents an integer from 1 to 6, and n represents 0.
or 1] as a photosensitive component addition group (
Using a photosensitive film in which a photosensitive layer formed from a colorant (hereinafter abbreviated as SBQ modified PVA) and a colorant are laminated, an image is formed on the photosensitive layer by exposure and development, and then a plurality of images are formed on the image receiving layer of an image receiving sheet. and the thermal adhesive layer are sequentially transferred by applying heat and pressure, and then all the images transferred onto the image receiving sheet and the thermal adhesive layer are transferred again onto a final support such as printing paper by applying heat and pressure. An object of the present invention is to provide an image transfer method using an image-receiving sheet with an excellent balance of adhesion and peeling.

More specifically, the above-mentioned SBQ modified PV is placed on the thermal adhesive layer made of polyester resin of the photosensitive transfer sheet.
After forming an image on the photosensitive layer consisting of A, (1) the image formed on the photosensitive transfer sheet and the thermal adhesive layer can be stably transferred onto the image receiving layer, and all images transferred onto the image receiving layer; The thermal adhesive layer can be stably transferred onto the final support such as printing paper without any difference between the image area and the non-image area. There should be no defective transfer to the body or paper smearing at the contact area between the image-receiving layer and the final support), and there should be no image transfer directly onto the two heated and pressurized rolls used in the transfer process. To provide an image forming method using an image receiving sheet with improved transfer stability in which part of the image receiving layer does not transfer to the roll even if the layers come into contact with each other, and the image receiving sheet does not wrap around the roll. be.

That is, the present invention provides an image-receiving layer of an image-receiving sheet using an aqueous dispersion of a resin in which the molecules of a copolymer of polyolefin and α,β-unsaturated carboxylic acid are crosslinked with metal ions, and ethylene and acetic acid. The transfer stability is improved by forming the resin from a mixture of a vinyl copolymer and an aqueous dispersion.

[0022]

[Operation] The image-receiving sheet of the present invention is obtained by coating an image-receiving layer on a transparent support. As the transparent support for the image-receiving sheet of the present invention, a conventionally known plastic film is used. For example, polyethylene terephthalate,
Transparent plastic films such as polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, triacetate, etc. can be mentioned. especially,
A biaxially stretched polyethylene terephthalate film is preferable because it is excellent in strength, heat resistance, dimensional stability, transparency, economical efficiency, and the like. The thickness of the transparent support is not particularly limited, but is suitably 50 to 150 μm.

[0023] The image-receiving layer of the image-receiving sheet of the present invention can be coated as it is on the support depending on the component ratio, especially when the copolymer component of ethylene and vinyl acetate is large, but it is preferable to apply a primer. It is desirable to coat on a treated support. As the resin forming the primer treatment layer, it is possible to use polyester, polyurethane, ethylene-vinyl acetate copolymer, acrylic-styrene copolymer, etc., but polyurethane obtained by crosslinking isocyanate and acrylic polyol can be used. It is most preferable to use When applying the primer treatment layer, there are no particular restrictions on the coating method, and any conventionally known method may be used. Moreover, the thickness of the coating layer is preferably 0.3 to 3.0 μm.

The image receiving layer of the image receiving sheet of the present invention is:
an aqueous dispersion of a resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid are crosslinked with metal ions;
It consists of a membrane formed from a mixture of a resin consisting of a copolymer of ethylene and vinyl acetate with an aqueous dispersion.

[0025] A resin made of a copolymer of ethylene and vinyl acetate provides stable thermal adhesion to an image and good releasability when transferring the transferred image to paper, etc. -By adding a resin in which the molecules of a copolymer with an unsaturated carboxylic acid are cross-linked with metal ions,
It is possible to strengthen the thermal adhesion with the image and make it easier to peel off the transferred image when transferring it to paper, etc. Furthermore, even when directly adhered to paper, etc., the paper surface It has characteristics such as being able to be re-peeled without damaging the film, and being less likely to transfer to the heated and pressurized rolls used during the transfer process.

[0026] A method for mixing a resin made of a copolymer of ethylene and vinyl acetate and a resin made by crosslinking molecules of a copolymer of polyolefin and α,β-unsaturated carboxylic acid with metal ions is melting by heating. There is a mixing method, but with this method it is extremely difficult to obtain a stable and uniform mixed state because the melting temperatures of both resins are different.Additionally, it is also difficult to obtain a stable and uniform mixed state when coating the base material by melt extrusion method. It is difficult to obtain a certain coating film. However, polyolefin and α, β-
In a mixture of an aqueous dispersion of a resin in which the molecules of a copolymer with an unsaturated carboxylic acid are crosslinked with metal ions, and an aqueous dispersion of a resin consisting of a copolymer of ethylene and vinyl acetate,
It is characterized in that a mixing state and coating film stability free from the above-mentioned problems can be easily obtained. For this reason, both resins are used in the form of an aqueous dispersion in the present invention.

Polymerizable monomers for obtaining the polyolefin forming the image receiving layer of the present invention include ethylene,
Propylene, 1-butene, 1-hexane, 1-hexene, 4-methyl-1-pentene, 1-octane, isobutylene, etc. can be used.

The α,β-unsaturated carboxylic acid used as the polymerizable monomer forming the image-receiving layer of the present invention usually has about 2 to 8 carbon atoms, such as acrylic acid, methacrylic acid, α-ethyl Acrylic acid, maleic acid, monomethyl maleate, itaconic acid and the like can be mentioned. In addition, instead of these α, β-unsaturated carboxylic acids, their esters such as methyl acrylate, ethyl acrylate, methyl methacrylate, n-butyl methacrylate, dimethyl fumarate, diethyl itaconate, dimethyl maleate, etc. are used. You can also do that. The above-mentioned polymerizable monomers such as polyolefin, α, β-unsaturated carboxylic acid, or ester thereof may be used alone or in combination of two or more.

Metal ions that bridge the molecules of the copolymer of polyolefin and α,β-unsaturated carboxylic acid forming the image-receiving layer of the present invention include lithium, sodium,
In addition to alkali metals such as potassium, zinc, magnesium, etc. can be used.

[0030] Weight percentage of the copolymer of the polyolefin and α,β-unsaturated carboxylic acid of the present invention, in which the molecules of the copolymer with α,β-unsaturated carboxylic acid are cross-linked with metal ions. is preferably 50% or more. When adding less than 50%, a resin made by crosslinking the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid with metal ions is added to a resin made of a copolymer of ethylene and vinyl acetate. It is excellent in terms of improved thermal adhesion with the resulting image and releasability of the transferred image, improved releasability after thermal adhesion with paper, etc., heat used during transfer, and no transfer to pressurized rolls. This is because the other characteristics will no longer be visible.

[0031] The degree of crosslinking by metal ions of the resin in which the molecules of the copolymer of polyolefin and α,β-unsaturated carboxylic acid of the present invention are crosslinked with metal ions is preferably 20 to 65%. When the degree of crosslinking is less than 20%, a copolymer of a copolymer of the polyolefin and an α,β-unsaturated carboxylic acid with an α,β-unsaturated carboxylic acid of a resin in which the molecules of the copolymer of the polyolefin and an α,β-unsaturated carboxylic acid are cross-linked with metal ions. As in the case of the weight ratio of The excellent feature of not metastasizing is no longer observed. Furthermore, if the degree of crosslinking is extremely high, it will be susceptible to the influence of moisture in the environment, and particularly if the coating film absorbs significant moisture, the thermal adhesion to the image and the peelability from the transferred image will decrease.

[0032] The method for producing a resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid are cross-linked with metal ions is well known;
-6810, JP-A-49-121891, etc. can be employed. In addition, methods for dispersing this resin in water include JP-A-51-62890 and JP-A-55-9.
8242 etc. can be used. The resin made of a copolymer of ethylene and vinyl acetate that forms the image receiving layer of the present invention can be produced using the conventionally known emulsion polymerization method, or by injecting the resin in a molten state into hot water using an already synthesized resin. It is obtained by a method of stirring.

The weight ratio of ethylene and vinyl acetate in the resin made of the ethylene and vinyl acetate copolymer of the present invention is 95.
It is preferable that it is /5 - 65/35. When the weight ratio of vinyl acetate is less than this range, sufficient thermal adhesion cannot be obtained, and when it is more than this range, tackiness occurs, making positioning work during image transfer difficult.

Melt index (ASTM D-1) of the resin comprising the copolymer of ethylene and vinyl acetate of the present invention
238) is preferably in the range of 5 to 350 g/min. If the melt index is lower than this range, the thermal adhesion to the image will decrease, and if it is higher, problems will occur such as decreased releasability from the transferred image and the inability to re-peel when directly adhered to paper etc. .

These image-receiving layers are made from an aqueous dispersion of a resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid are crosslinked with metal ions, and a copolymer of ethylene and vinyl acetate. The composition of the mixture of resin and water dispersion mainly depends on the image formed on the photosensitive transfer sheet, the adhesive force between the thermal adhesive layer and the image receiving layer, the image after being transferred to the final support, and the thermal adhesion. It is determined by the balance of peeling force between the layer and the image receiving layer. That is, the thermal adhesive layer and image formed on the photosensitive transfer sheet are 2.0 to 4.5 g/25 mm after being transferred by applying heat and pressure to the image receiving sheet.
Peel force (ASTM D-903-49: Peel speed =
It is preferable from the viewpoint of workability that the transparent support of the photosensitive transfer sheet can be peeled off at a speed of 300 mm/min. Therefore, it is necessary that the thermal adhesive layer and the image adhere to the image-receiving sheet more strongly than this, but if this adhesion is too strong, the image-receiving sheet cannot be bonded to the image-receiving sheet after transferring the image and thermal adhesive layer to the final support. When peeling off, a phenomenon occurs in which the image and the thermal adhesive layer cannot be peeled off from the image receiving layer and cannot be transferred to the final support. Furthermore, if the peeling force is too weak, a phenomenon occurs in which the image and the thermal adhesive layer are peeled off from the image receiving layer when the transparent base of the photosensitive transfer sheet is peeled off. For this reason, the peeling force between the image, thermal adhesive layer, and image receiving layer is 4.5 to 30 g.
It is preferable that the film can be peeled off at a distance of /25 mm. For these reasons, the composition of the image-receiving layer is determined by the balance between adhesive force and peeling force. The composition of the mixture of ethylene and vinyl acetate copolymer resin aqueous dispersion is 90/10~
Selected from a weight ratio of 10/90.

There are no particular restrictions on the method of coating the image-receiving layer of the image-receiving sheet of the present invention on the support, and any conventionally known methods such as the blade method, air knife method, etc. may be used without any problem. In addition, the thickness of the image receiving layer needs to be larger than the sum of the thickness of all transferred images and the depth of the unevenness on the surface of the final support, but if it is too thick, images of each color are overlapped. It has the disadvantage of worsening the registration accuracy when matching. Usually, when printing paper is selected as the final support, the thickness of the image receiving layer is preferably selected from the range of 15 to 150 μm.

The structure of the photosensitive transfer sheet used in the present invention is such that a thermal adhesive layer and a photosensitive layer are formed on a transparent support provided with a release layer if necessary. The mold release layer provided as necessary is for facilitating the peeling of the thermal adhesive layer and the transparent support, and the thermal adhesive layer has a peeling force of 2.0 as the material for forming the mold release layer. It is desirable that the material be selected so that it can be peeled off at ~4.5 g/25 mm. Examples of resins that can easily obtain this peeling force include urethane resins and melamine resins. It is also possible to adjust the release force by adding an inorganic pigment such as silica to this release layer. The thickness of the release layer is preferably selected from the range of 0.5 to 5.0 μm.

The thermal adhesive layer of the present invention sufficiently adheres to the image formed thereon, can be easily peeled from the transparent support provided with a release layer if necessary, and can be heated or heated. During transfer under pressure, it is necessary to have sufficient adhesion to other images to be transferred and to the thermal adhesive layer, and to have appropriate adhesion to the image-receiving layer of the image-receiving sheet. Examples of resins that satisfy these purposes include ethylene-vinyl acetate copolymers, polyolefins, and polyesters, but polyesters are most preferred in terms of adhesion to images, transfer stability, and the like. The thickness of the thermal adhesive layer is 0.5 to 2.5
It is preferable that the thickness be selected from the μm range.

The photosensitive layer of the present invention comprises the above-mentioned SBQ-modified PVA and a colorant. SBQ modified PVA
761, Japanese Patent Publication No. 56-5762, and Japanese Patent Publication No. 56-56-
11906 and the like. However, for the SBQ-modified PVA that is effective in the present invention, it is desirable that the addition rate of a photosensitive component addition group such as a stilbazolium group or a stilquinolinium group is in the range of 0.3 to 4.0 mol%. As the coloring agent, conventionally known pigments and dyes can be used, but those having a color tone that closely resembles that of printing ink are selected. SBQ modified PVA and colorant are typically utilized in a ratio of 80/20 to 97/3. This ratio is determined at a ratio that allows a density close to that of an actual printed matter to be obtained. Moreover, various additives such as organic solvents, leveling agents, antifoaming agents, etc. can be added to these to improve the coating properties. The thickness of the photosensitive layer is preferably selected from the range of 0.5 to 4.0 μm.

A color proof by the image forming method of the present invention is produced by the following procedure. 1. A stage in which a negative original is placed on a photosensitive transfer sheet, exposed to active light (usually an ultraviolet light source), and then washed and developed with water to form an image. At this stage, images are formed on the photosensitive transfer sheet with the required number of colors. That is, in the case of normal color printing, separated images of four colors, yellow, magenta, cyan, and black, are formed. 2. Overlaying the separated color image on the image receiving layer of the image receiving sheet,
The color separation image and the thermal adhesive layer are pasted onto the image receiving layer by passing between two heated and pressurized rolls, and after cooling, the transparent support of the photosensitive transfer sheet is peeled off. Furthermore,
The remaining color separation images are sequentially transferred onto the transferred color separation image and the thermal adhesive layer in the same manner. The heating temperature of the roll is 80~1
It is desirable to apply a pressure of 1.0 to 6.0 Kgf/cm2 from both ends of the roll at 30°C. 3. A final support is placed on the image-receiving sheet onto which all the color-separated images have been transferred, and the final support is passed between two heated and pressurized rolls. The thermal adhesive layer is laminated onto the final support, and after cooling, the image receiving sheet is peeled off to form an image on the final support.

[0041]

【Example】

1) Photosensitive transfer sheet On a biaxially stretched polyester film with a thickness of 100 μm - 30 parts of saturated polyester (Thermolac F1: Soken Kagaku Co., Ltd.) - Vinyl chloride and vinyl propionate copolymer (Leuron Qu-628) :Toyo Soda Kogyo Co., Ltd.)
20 parts ・Silica (Mizuka Seal SK-7: Mizusawa Chemical Co., Ltd.)
Part 5 ・Toluene

220 parts ・Methyl ethyl ketone
120 copies
・Cyclohexane

A release layer consisting of 60 parts was coated to a dry film thickness of 2 μm, and on top of that: ・Polyester (Vylonal MA-14: Toyobo Co., Ltd.) 20 parts ・Isopropyl alcohol
40 copies
·water

A thermal adhesive layer consisting of 40 parts with a thickness of 1μ
The photosensitive layers of the four colors shown in the table below were further coated.

[0042]

A negative original was placed on the photosensitive transfer sheet thus obtained, and exposed using an exposure device equipped with an ultraviolet light source.
Each color separated image was obtained by washing with water and drying.

2) Example of composition of coating liquid for forming image receiving layer. 1 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid 25% aqueous dispersion consisting of metal ion: sodium polyolefin and α, β-unsaturated carboxylic acid copolymerization ratio: 85/15 ・Crosslinking degree: 35% ■ (resin consisting of a copolymer of ethylene and vinyl acetate) 35% aqueous dispersion consisting of a copolymerization ratio of ethylene and vinyl acetate: 85/15 and a melt index of 150. Solid content mixing ratio of (aqueous dispersion of resin cross-linked with metal ions) and (aqueous dispersion of resin consisting of a copolymer of ethylene and vinyl acetate): 20/80

[0045]
Example. 2 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are crosslinked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid 25% aqueous dispersion consisting of metal ion: sodium polyolefin and α, β-unsaturated carboxylic acid copolymerization ratio: 85/15 ・Crosslinking degree: 35% ■ (resin consisting of a copolymer of ethylene and vinyl acetate) 35% aqueous dispersion consisting of a copolymerization ratio of ethylene and vinyl acetate: 85/15 and a melt index of 150. Solid content mixing ratio of (aqueous dispersion of resin cross-linked with metal ions) and (aqueous dispersion of resin consisting of a copolymer of ethylene and vinyl acetate): 50/50

[0046]
Example. 3 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid 25% aqueous dispersion consisting of metal ion: sodium polyolefin and α, β-unsaturated carboxylic acid copolymerization ratio: 85/15 ・Crosslinking degree: 35% ■ (resin consisting of a copolymer of ethylene and vinyl acetate) 35% aqueous dispersion consisting of a copolymerization ratio of ethylene and vinyl acetate: 85/15 and a melt index of 150. Solid content mixing ratio of (aqueous dispersion of resin cross-linked with metal ions) and (aqueous dispersion of resin consisting of a copolymer of ethylene and vinyl acetate): 80/20

[0047]
Example. 4 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid 25% aqueous dispersion consisting of metal ion: sodium polyolefin and α, β-unsaturated carboxylic acid copolymerization ratio: 85/12 ・Crosslinking degree: 45% ■ (resin consisting of a copolymer of ethylene and vinyl acetate) 35% aqueous dispersion consisting of a copolymerization ratio of ethylene and vinyl acetate: 85/14 and a melt index of 150. Solid content mixing ratio of (aqueous dispersion of resin cross-linked with metal ions) and (aqueous dispersion of resin consisting of a copolymer of ethylene and vinyl acetate): 50/50

[0048]
Example. 5 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid 25% aqueous dispersion consisting of metal ion: sodium polyolefin and α,β-unsaturated carboxylic acid copolymerization ratio: 85/15 ・Crosslinking degree: 55% ■ (resin consisting of a copolymer of ethylene and vinyl acetate) 35% aqueous dispersion consisting of ethylene and vinyl acetate copolymerization ratio: 87/13 Melt index: 175 Solid content mixing ratio of (aqueous dispersion of resin cross-linked with metal ions) and (aqueous dispersion of resin consisting of a copolymer of ethylene and vinyl acetate): 50/50

[0049]
Comparative example. 1 ■ (Aqueous dispersion of resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions) ・Polyolefin: ethylene ・α, β-unsaturated carboxylic acid: methacrylic acid Metal ion: sodium 25% aqueous dispersion consisting of polyolefin and α, β-unsaturated carboxylic acid copolymerization ratio: 85/15 ・Crosslinking degree: 35%

Comparative example. 2 (Aqueous dispersion of resin consisting of ethylene and vinyl acetate copolymer) - 35% aqueous dispersion consisting of ethylene and vinyl acetate copolymerization ratio: 85/15 - Melt index: 150

3) Image receiving sheet On a biaxially stretched polyester film with a thickness of 125 μm - Acrylic polyol (Thermolac U-24
5B: Soken Chemical Co., Ltd.)


45 parts ・Isocyanate (Takenate D-11
0N: Takeda Pharmaceutical Co., Ltd. 20 parts ・Silica (
Mizuka Seal SK-7: Mizusawa Chemical Co., Ltd.)
Part 5 ・Toluene

100 copies
·Ethyl acetate

100 parts ・Ethyl cellosolve

Dry film thickness 2 μm consisting of 50 parts
Each of the coating solutions of Examples 1 to 5 and Comparative Examples 1 to 2 was applied onto the primer layer using a blade, and dried with hot air at 140°C for 5 minutes to form an image receiving layer with a dry film thickness of 80 μm. An image receiving sheet was obtained.

4) After forming the multicolor image sheet, the yellow image of the photosensitive transfer sheet on which an image has already been formed is superimposed on the image receiving layer of this image receiving sheet, and the yellow image is placed between two heated and pressurized rolls. The color separation image and the thermal adhesive layer are pasted onto the image-receiving layer by passing through the photosensitive transfer sheet, and after cooling, the transparent support of the photosensitive transfer sheet is peeled off. Furthermore, the remaining color separation images are similarly transferred in the order of magenta, cyan, and black onto the transferred color separation image and the thermal adhesive layer. Furthermore, a final support is placed on the image-receiving sheet onto which all the separated color images have been transferred, and the final support is passed between two heated and pressurized rolls. The image and the thermal adhesive layer are laminated onto the final support, and after cooling, the image-receiving sheet is peeled off to form an image on the final support. The heating temperature of the roll was 120℃, the pressure applied from both ends of the roll was 4.0kgf/cm2, and the transfer speed was 50℃.
The speed was 0 mm/min.

Peeling force after thermally adhering the image-receiving layer of these image-receiving sheets to the first color image, and peeling force after transferring four-color images to the image-receiving layer of the image-receiving sheet (both peeling forces are ASTM D-903-49: Peel speed = 3
(Measured at 00mm/min), paper blistering (the degree of damage to the paper when the part where the paper and image receiving layer were directly adhered to each other was peeled off during the transfer process), and the image receiving layer coming into contact with the heated and pressurized roll during transfer. The following table summarizes the transfer of the image receiving layer to the roll and the transfer state of the final image.

[0054]

[0055]

Effects of the Invention As can be seen from the table above, the present invention improves the releasability between the transferred image and the image-receiving layer, the releasability between the paper to be printed and the image-receiving layer (paper peeling), and the transferability of the image-receiving layer to the transfer roll. This is an image forming method that is excellent in terms of transferability and transfer state of the final image.

Claims (13)

[Claims] Claims: 1. A thermally adhesive layer on a transparent support made of a polyester resin that is removable from the transparent support and has thermally adhesive properties, [wherein R1 and R2 in the above formula are each independently a hydrogen atom or represents an alkyl group, Y- represents a conjugated chlorinated ion of an acid, m represents an integer from 1 to 6, and n represents 0 or 1] selected from stilbazolium and stilquinolinium groups; Exposure to actinic rays and washing phenomenon with water on the photosensitive layer of a photosensitive film in which a photosensitive layer formed from a colorant and modified polyvinyl alcohol (hereinafter abbreviated as SBQ modified PVA) having at least one type as a photosensitive component addition group is laminated. After forming an image by using heat and pressure, the image of each color photosensitive film and the thermal adhesive layer are sequentially transferred to the image receiving layer of an image receiving sheet comprising an image receiving layer provided on another transparent support. , an image forming method in which all transferred thermal adhesive layers and images are retransferred to a final support by heat and pressure, the image receiving layer comprising molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid. An image forming method characterized in that the image forming method is formed from a mixture of an aqueous dispersion of a resin cross-linked with metal ions and an aqueous dispersion of a resin comprising a copolymer of ethylene and vinyl acetate. 2. A resin made of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid, which forms the image receiving layer, and a copolymer of ethylene and vinyl acetate, and a resin in which the molecules of a copolymer are crosslinked with metal ions. The weight ratio is 90/10~
2. The image forming method according to claim 1, wherein the image forming method is 10/90. 3. In a resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid forming the image receiving layer are cross-linked with metal ions, the metal ions are alkali metals or alkaline earth metals. 3. The image forming method according to claim 1, wherein the image forming method is an ion of a certain metal. 4. Polyolefin and α, β-unsaturated carboxylic acid, which form the image receiving layer, are made of a resin in which the molecules of a copolymer of polyolefin and α, β-unsaturated carboxylic acid are cross-linked with metal ions.
Weight ratio with β-unsaturated carboxylic acid is 50/50-9
4. The image forming method according to claim 1, wherein the image forming method is 5/5. 5. In a resin in which a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid forming the image receiving layer is cross-linked with metal ions, the metal ion of the α,β-unsaturated carboxylic acid is Any one of claims 1 to 4, wherein the degree of crosslinking is 20 to 65%.
Image forming method described in section. 6. A claim characterized in that the polyolefin of the resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid are crosslinked with metal ions to form the image receiving layer is ethylene. The image forming method according to any one of Items 1 to 5. 7. The α,β-unsaturated carboxylic acid of the resin in which the molecules of a copolymer of a polyolefin and an α,β-unsaturated carboxylic acid which form the image receiving layer are cross-linked with metal ions is methacrylic acid. The image forming method according to any one of claims 1 to 6, characterized in that: 8. Claim 1, wherein the weight ratio of ethylene and vinyl acetate in the resin made of a copolymer of ethylene and vinyl acetate forming the image receiving layer is 95/5 to 65/35. The image forming method according to any one of items 7 to 7. 9. The resin comprising the copolymer of ethylene and vinyl acetate forming the image receiving layer has a melt index (according to the method described in ASTM D-1238) of 5.
9. The image forming method according to any one of claims 1 to 8, characterized in that the rate is from g to 350 g/min. 10. The thickness of the image receiving layer is 15 to 1
10. The image forming method according to claim 1, wherein the thickness is 50 μm. 11. After transferring the image by applying heat and pressure to the final support, peel strength (A) between the image formed on the photosensitive layer of the photosensitive film or the thermal adhesive layer and the image receiving layer is determined.
STM D-903-49: Peeling speed = 300mm
11. The image forming method according to any one of claims 1 to 10, characterized in that the weight ratio (g/min) is 4.5 to 30 g/25 mm. 12. The image forming method according to claim 1, wherein the image-receiving sheet has an image-receiving layer coated on a support via a primer layer. . 13. Any one of claims 1 to 12, wherein the primer layer used in the image receiving sheet is made of a crosslinked product of isocyanate and polyol.
Image forming method described in section.