JPH0258058A - Image forming material - Google Patents

Abstract

PURPOSE:To make it possible to form a prepress proof which has a stable concentration even on a paper with a coarse surface and does not generate transfer unevenness by incorporating a low melting point resin which is a solid at a room temp., in a photosensitive layer contg. in the subject material. CONSTITUTION:The photosensitive layer contg. a coloring agent and the low melting point resin (A) which is the solid at the room temp. and has an ethylenically unsatd. group, is mounted on the image forming material. The prepress proof for color proof-reading is formed by generating the difference of sticking property between the exposed part and the unexposed part of the photosensitive layer by image-wisely exposing the photosensitive layer and then being transferred the obtd. picture on a paper, etc. Preferably, a thermoplastic resin, an ethylenically unsatd. compd. and a photopolymerization initiator, in addition to the components mentioned above, are incorporated in the photosensitive layer. The layer is preferably constituted of plural layers. The component A may contain a wax. etc., having carboxylic group which has property of giving a low viscosity liquid at a thermal transfer temp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to the formation of two images, and more specifically, 1. It is an image forming material that uses the difference in adhesiveness between the exposed and unexposed areas of the photosensitive layer to form images in a single color or by overlapping multiple colors.As a 9-color proofing bristle press proof, it is possible to obtain transfers that are similar to printed materials. Relating to imaging materials.

(Prior Art) Conventionally, in the field of printing industry, it has been known to utilize a prepress proof as a means for confirming the finished two-tone etc. of the final printed matter before printing. There are two types of prepress proofs: an overlay method and a subprint method, which are used depending on the final image quality and the purpose of use in the plate-making and printing processes.

In the overlay method, each transparent base film is provided with a photosensitive layer corresponding to each color separation (separation) image, and each film obtained through the actinic ray irradiation and development process is visually checked for color registration. overlay. Although this method is very simple, it is affected by the light reflected from the film when one layer is stacked.

It has defects that differ from the texture of actual printed matter.

The server print method is 2For example, US Patent No. 3060023
As disclosed in Japanese Patent No. 3,060,024 and No. 3,060,025, several color-separated images are sequentially formed by overlapping several photosensitive layers on a single support. For coloring, there are a simple transfer method and a method using powder color toner, but the transfer method has the advantage of being easy to operate. On the other hand, in the method using powder color toner, due to the powder, consideration must be given to the working environment.

The quality of prepress proofs requires copies that are similar to printed materials, but with transfer methods, it is difficult to obtain copies that are similar to printed materials in terms of gloss, halftone reproducibility, etc. for 5 different image receptors. Furthermore, in the method using powder color toner, it is difficult to approximate actual printed matter because printing is a separate process.

Also, Japanese Patent Publication No. 59-97410, 61188
No. 537 discloses a proofing system that can be used for both the overlay method and the sublint method. In this proofing system.

(1) Release layer 2 A color sheet consisting of a colored photosensitive layer and a protective layer laminated in sequence on a polyester support, and an image-receiving film consisting of an image-receiving layer and a protective film on a polyester support are prepared.

(2) One image is formed by bringing the emulsion side of the color sheet into close contact with the halftone negative, and then the unexposed areas are eluted with a mixed solution of soda carbonate, butyl secosolve, and water. After drying, it is also effective as an overlay type proofing.

(3) For proofing as a subprint method, black, cyan, magenta, and yellow were sequentially transferred to the image receiving film by registration by visual inspection or punching at a temperature of 110°C, a pressure of 2 bars, and a speed of 60 cmZ. rear.

(4) After transferring to a receptor, which is a transfer target, to obtain a normal image, the reflective gloss of the transfer layer and the colored layer is reduced, and a film subjected to a matting treatment is transferred to a rutamé to obtain proofing.

In this method, a clear layer exists in the non-image area.

The texture was different from the actual printed matter. A further drawback is that a development step is required. Also, in -degree transfer, the orientation of the image is opposite to that of the printed matter.

Requires another transfer process. Regarding the orientation of the image obtained by - degree transfer, it will be a reverse image and will require another transfer, or a normal image will be obtained by - degree processing but 1
There was a drawback that image accuracy decreased, that is, a sharp image could not be obtained.

The above problems, namely, (1) Requires a developing process.

(2) A clear layer is present in the non-image area, and the texture is different from the actual printed matter.

(3) The device is large and disadvantageous in terms of space and cost.

(4) It takes time to work.

A known method for improving this is to provide an image forming material with a difference in tackiness between exposed and unexposed areas, and then thermally transfer the image directly to an image receptor. However, since the image-forming material used in this method is usually supplied in sheet form, the viscosity of the sheet is increased to ensure storage stability, thereby preventing the photosensitive material from seeping out from the edges of the sheet. For this reason, the heat-melting viscosity of the photosensitive material during transfer is also high (which means that it is possible to transfer photosensitive materials to image receptors with smooth surfaces such as art paper and coated paper, but Image receptors with rough surfaces, such as the Attempts have been made to lower the temperature, but the high temperature deteriorates workability and causes thermal deformation of the base sheet and image receptor used in the image forming material. There was a problem that the positions of each color were shifted.

(Problem to be Solved by the Invention) Any method that can create a prepress proof involves a substantial development step.

Because the creation process is complicated and the texture is different from the actual printed matter from this machine, it has been mainly used to check the process between plate making and printing, but even when used as a substitute for the actual printed matter, it will not be of good quality. The perception was that they were different.

Therefore, the reflection density of the image formed is constant.

A method that can form fine images has been desired. Furthermore, it is desirable to form an image in which no image forming material or the like is present in the non-image area, as in the original printed matter of 9.

[Structure of the invention]

(Means for Solving the Problems) An object of the present invention is to be able to form an image on paper having a rough surface with the same image quality as the printed matter of this machine, and to form an image in which no image forming material is present in the non-image area. The goal is to provide materials.

In other words, the present invention maintains the viscosity of the photosensitive layer at a high level during sheet storage by containing a low-melting resin having an ethylenically unsaturated group that is solid at room temperature in the photosensitive layer of the image forming material, and quickly transfers the image during thermal transfer. By melting and lowering the viscosity of the photosensitive layer, the density is stable even on image receptors with rough surfaces, and there is no uneven transfer.

An object of the present invention is to provide an image forming material that can produce a prepress proof that closely resembles a printed image.

That is, 1. the present invention comprises forming a photosensitive layer containing dyes and/or pigments on a support, imagewise exposing the layer, and creating a difference in tackiness in transfer between exposed and unexposed areas of the photosensitive layer; 2. An image forming material that transfers an image to an image receptor such as paper, the photosensitive layer of which contains a low melting point resin having an ethylenically unsaturated group; It is an image forming material consisting of an unsaturated compound, a low melting point resin having an ethylenically unsaturated group, and a pigment and/or dye.

In addition, the photosensitive layer has a plurality of layers, at least one layer contains a pigment and/or dye, and the photosensitive layer in contact with the image receptor contains a low melting point resin having an ethylenically unsaturated group that is solid at room temperature. Regarding forming materials.

The present invention uses art paper, coated paper, and other ink receptors for simple, quick, and stable single-machine printing with the same texture as actual printed matter in the subprint method.

In particular, it is an image forming material that can be directly transferred to an ink receptor having a rough surface such as high-quality paper or Shinkai paper. Of course, this method can also be applied to the overlay method.

The image forming material according to the present invention usually has a structure of support/colored photosensitive layer/protective film, support/colored photosensitive layer/uncolored photosensitive layer/protective film, etc. is explained below.

As the support, a material that is stable to heat, chemicals, light, etc., and that transmits actinic rays is suitable. For example, cellulose acetate, polystyrene, polyvinyl chloride, polyethylene terephthalate.

Films or sheets made of polycarbonate, polyimide, polypropylene, etc. Particularly preferred is a polyethylene terephthalate film or sheet from the viewpoints of transparency, thermal stability, one-dimensional stability, and the like.

Furthermore, although these supports may be used as they are, suitable oil-repellent materials include silicone resins and fluororesins.

Examples of the protective film include, but are not limited to, polyethylene film, polyethylene terephthalate film, and acetate film. Note that the protective film is a film that is removed after exposure for one image, and does not exist when transferring to a two-image receptor. Therefore, the support is present at the time of transfer.

The photosensitive layer of the present invention usually comprises a thermoplastic resin, an ethylenically unsaturated compound, a low melting point resin having an ethylenically unsaturated group that is solid at room temperature, a pigment and/or dye, and a photopolymerization initiator. In addition, when the photosensitive layer is made into a plurality of layers, at least one layer may contain a pigment and/or a dye. Of course, two or more photosensitive layers can also contain pigments and/or dyes.

In addition, when the photosensitive layer is composed of a plurality of layers, the photosensitive layer that comes into contact with one image receptor contains a low melting point resin having an ethylenically unsaturated group that is solid at room temperature.

Other photosensitive layers may or may not contain this low melting point resin. However, if the other photosensitive layers do not contain this low melting point resin, the difference in melt viscosity between the photosensitive layer in contact with one image receptor during thermal transfer and the photosensitive layer closest to the support becomes large, and the support Since cohesive failure may be less likely to occur in the photosensitive layer closest to the support, in such cases, the photosensitive layer closest to the support should have the same composition as the photosensitive layer in contact with the image receptor, or the photosensitive layer should be heated at room temperature. The thermoplastic resin can have a composition with a high content of low melting point resin having solid ethylenically unsaturated groups. Polymers that do not exist can be used. For example, polyvinyl chloride poly(meth)acrylic acid, poly(meth)acrylic ester, polyvinyl ether, polyvinyl acecool, urethane resin, epoxy resin, polyamide, polyester, vinylidene chloride-acrylonitrile copolymer, vinylidene chloride-methacrylate copolymer polyolefins (e.g. chlorinated polyethylene).

synthetic rubbers such as butazine-acrylonitrile copolymers, diallyl phthalate resins (e.g. diallyl isophthalate polymers, diallyl orthophthalate polymers),
These water additives, rosin and its derivatives, pinene polymer, hydrocarbon resin (Escolettes 1102B Tonen Oil Chemical Co., Ltd., Vetrogin #80), etc. One or a mixture of two or more of these may be used.

It is possible to add polymers other than these thermoplastics to obtain desired physical properties. For example, adhesion to a support, adhesion to a receiver during transfer, and abrasion resistance can be improved. Suitable non-thermoplastic polymeric compounds include, for example, phenolic resins, melamine-formaldehyde resins, urethane resins, and the like. In addition, a small amount of filler may be included as a component of this photosensitive layer, examples of which include silica, mica, hentonite, etc.
It may be present in an appropriate amount depending on the properties required.

Ethylenically unsaturated compounds that can be used in the present invention include 2
For example, (meth)acrylic acid, methyl (meth)acrylate-1-, butyl (meth)acrylate-1-, cyclohexyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, Hensyl (Meth)acrylate 5 Carpitol (meth)acrylate 2 Ethylhexyl (meth)
Acrylate-1-, lauryl (meth)acrylate, 2-
Hydroxyethyl (meth)acrylate glycidyl (
meth)acrylate (meth)acrylamide, N-methylol(meth)acrylamide, styrene, acrylonitrile N-vinylpyrrolidone, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate polyethylene glycol di(meth)acrylate (meth)acrylate, polypropylene glycol di(meth)acrylate butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate 1,4-
Butanediol diacrylate, 1,6-hexanethiol di(meth)acrylate, pentaerythritol diacrylate.

Pentaerythritol triacrylate, trimethylolpropane triacrylate, dipentaerythritol 1--
Ruhexaacrylate, phenoxyethyl acrylate, nonylphenoxyacrylate, tetrahydrofurfuryloxyacrylate, caprolactone-modified tetrahydrofurfuryl acrylate ethylene oxide (EO
) Modified methacrylate-1,2 phenoxydiethylene glycol acrylate, EO-modified phthalic acid acrylate, (meth)acrylate of alkylene oxide adduct of phenol, caprolactone-modified hydroxypivalate neopentyl glycol diacrylate, dicyclopentanyl diacrylate, etc. Low molecular weight ethylenically unsaturated compounds or high molecular weight ethylenically unsaturated compounds such as epoxy acrylates, urethane acrylates, polyester acrylates, alkyd acrylates, acrylic acid modified products of petroleum resins, and unsaturated polyesters. One or a mixture of two or more of these may be used.

In the present invention, the low melting point resin having an ethylenically unsaturated group that is solid at room temperature refers to a resin that is solid or wax-like at room temperature and is a low viscosity liquid at the thermal transfer temperature. This property is intermediate between that of the thermoplastic resin and the ethylenically unsaturated compound, which are other components constituting the photosensitive layer of the present invention. That is, the thermoplastic resin is solid at room temperature, and has high viscosity although it has properties close to liquid at the thermal transfer temperature. On the other hand, many ethylenically unsaturated compounds are liquid at room temperature, or they are highly viscous substances close to solids, but their viscosity changes little with heat and exhibit properties similar to thermoplastic resins, or they are solids. Also, since it has a relatively low molecular weight, when used in a mixture, it causes a drop in solidity point and becomes liquid. In the photosensitive layer made of these thermoplastic resins and ethylenically unsaturated compounds, thermal transferability and sheet storage stability are contradictory properties, so attempts are made to balance them. However, even if the balance can be achieved when the image receptor has a smooth surface, if sheet storage stability is important for high-quality paper, newspaper, etc. that have a rough surface, uneven transfer may occur, which is a problem. When emphasis is placed on transferability, storage stability is often inferior.

In order to solve this problem, it is desirable to use a resin that is solid or waxy at room temperature and liquid with low viscosity at thermal transfer temperatures. In order to impart this property, the ratio of the thermoplastic resin and the ethylenically unsaturated compound to other components constituting the photosensitive layer of the present invention varies depending on the ratio of the types of the thermoplastic resin and the ethylenically unsaturated compound. By including 5 parts by weight or more in 100 parts by weight of the composition set as follows, it is possible to form an image without uneven transfer even on an image receptor having a rough surface, and there is no problem in sheet storage stability.

In addition, if the performance required for an image forming material can be satisfied only with various low-melting resins having the above properties and having ethylenically unsaturated groups that are solid at room temperature, thermoplastic resins and/or ethylenically unsaturated There is no need to use compounds.

In the present invention, for the purpose of imparting the above-mentioned properties, low-melting resins having no ethylenically unsaturated groups can also be used, but if used in large quantities, an image may be formed on the image receptor after image exposure of one image-forming material. When forming a photoreceptor, a problem arises in that the exposed area is hardened and the low melting point resin oozes out even though it is a non-transferred area and stains the image receptor. Therefore, when using a low melting point resin that does not have ethylenically unsaturated groups, it should be used to the extent that the above problems do not occur.

In the present invention, the low-melting resin having an ethylenically unsaturated group that is solid at room temperature is used in "Properties and Applications of Wax," published by Saiwai Shobo.
A wax having a carboxyl group such as an acid wax or an ester wax, or an α-olefin-maleic anhydride resin having a hydroxyl group in the carboxyl group, as shown in Section 111 of ``Published September 10, 1982'', Furthermore, monomers having ethylenically unsaturated groups such as allyl alcohol, cinnamyl alcohol, 0-hydroxystyrene, m-hydroxystyrene. 3-Methoxy-4-hydroxystyrene, hydroxyethyl methacrylate, propylene glycol monoacrylate, etc. are reacted with hydroxyl groups. A monomer having an epoxy group and an ethylenically unsaturated group, such as vinyl ethylene oxide or glycidyl methacrylate, is reacted with the epoxy group. A monomer having an isocyanate and further having an ethylenically unsaturated group, such as vinyl phenyl isocyanate, vinyl isocyanate, isopropenyl isocyanate, is reacted with the isocyanate. Monomers having an amide group or an amino group and further having an ethylenically unsaturated group, such as acrylamide, 0-aminostyrene,
It is reacted with an amide group or an amino group such as vinylbenzylamine, vinyl ether of ethanolamine, allylamine, and -vinyl-1-alkylguanisidine. A compound having a polyfunctional hydroxyl group, such as ethylene glycol, pentaerythritol, or glycerin, is reacted with the hydroxyl group, and the remaining hydroxyl group is converted into a monomer having a carboxyl group and an ethylenically unsaturated group, such as acrylic acid. , methacrylic acid, crotonic acid, citraconic acid, etc. Jepoxy compounds or polyepoxy compounds, such as ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether,
An epoxy group such as glycerol polyglycidyl ether is reacted, and the remaining epoxy group is reacted with a monomer having an ethylenically unsaturated group and having a hydroxyl group, a carboxyl group, an amino group, etc. Diisocyanate or polyisocyanate compounds such as 2,4-tolylene diisocyanate (TD), xylene diisocyanate (
The above carboxyl group obtained by a method such as reacting with an isocyanate such as XDI) and reacting the remaining isocyanate with a monomer having a carboxyl group or a hydroxyl group and further having an ethylenically unsaturated group, etc. When reacting with , it is desirable to react all the carboxyl groups in order to increase the curability by ultraviolet rays, but care must be taken in selecting the reaction rate in order to make the material solid at room temperature.

Alternatively, a synthetic oil-based wax such as hydrogenated castor oil or glycerin monostearard can be obtained by reacting a functional group that reacts with the hydroxyl group of a compound with a monomer having an ethylenically unsaturated group. Examples of these include (meth)acrylic acid, crotonic acid, citraconic acid and other monomers having carboxyl groups and ethylenically unsaturated groups, vinyl phenyl isocyanate, vinyl isocyanate, isopropenyl isocyanate TDII moles and 2-hydroxyethyl (
Adduct of 1 mol of meth)acrylate, 11 mol of XD and 2
Adduct of 1 mole of hydroxyethyl (meth)acrylate.

Isophorone diisocyanate (IPDI) 1 mole and 2
An adduct of 1 mole of hydroxyethyl (meth)acrylate, an adduct of 1 mole of MDI (diphenylmethane diisocyanate) and 1 mole of 2-hydroxyethyl (meth)acrylate, an isocyanate group such as ethyl (meth)acrylate and ethylenically unsaturated These are monomers that are similar to the group.

One or two types of low melting point resin having ethylenically unsaturated groups are used.
Can be used as a mixture of more than one species.

As the photopolymerization initiator, it is more preferable to use one that has low absorption in the visible light region.1 For example, benzophenone 44
-Bis(diethylamino)benzophenone 4-methoxy-4-dimethylaminobenzophenone, 2-ethylanthraquinone, phenanthraquinone, benzoin, benzoin methyl ether benzoin phenyl ether, isobutyl benzoin ether, isopyropyl benzoin ether, benzoin ethyl ether, 2 , 2-jethoxyacetophenone 2-hydroxy-2-methylpropiophenone, 4'-isopropyl-2-hydroxy-
2-methylpropiophenone, p-tertbutyltrichloroacetophenone, Michler's ketone, benzyl dimethyl tital, 2,2-dimethoxy-2-phenylacetophenone, hydroxycyclohexyl phenyl ketone, benzophenone, azobisisobutylnitrile, 2-chlorothio Xanzone, 2-methylthiozanzone
These include 2-ethyldiozanzone, 2-isoprobylthiozanzone, and the like. These addition polymerization initiators may be used alone or in combination of two or more.

When using two or more types in combination, consideration should be given to the mutual influence on free radicals generated by light absorption. Furthermore, various sensitizers may be added to improve the addition polymerization rate. One or more types of conventionally known photopolymerization initiators can also be used. As thermal polymerization inhibitors, p-methoxyphenol, hydroquinone, t
-Butylcatechol.

Pyrogallol, pyridine, arylphosphite, etc. can be used.

The thickness of the photosensitive layer should be about 0.5 to 5 μm, and the appropriate coating amount varies depending on the dye and/or pigment contained. 5 g/rrr ~10 g/rr
f is appropriate. Although the coating of the present invention was carried out using a bar coater or the like, it is of course possible to use a gravure coater or a similar coater, for example.

Conventionally known dyes and/or pigments can be used as the dyes and/or pigments contained in the photosensitive layer.

The shell requires dyes and pigments that match the four colors of yellow, magenta, cyan, and black, as well as metal powder,
White pigments, fluorescent pigments, etc. are also used. For color proofing, there are yellow, red, indigo, and ink, and pigments or dyes that match these hues may be selected.

In addition, in the multilayer photosensitive layer, the coloring agent used is when all layers contain the same coloring agent at the same or different concentrations, when each photosensitive layer contains a different coloring agent, There is a 1st grade in which one photosensitive layer contains a colorant and the other layers do not contain a colorant.

When one of the different colorants is ink, the colorant used in the other photosensitive layer is not particularly limited and may be yellow, red, indigo, or other ink.

Additionally, if one photosensitive layer contains a colorant and the other layers do not, the photosensitive layer closest to the support should be transparent, that is, it should not contain a colorant. is desirable. This is effective in keeping the concentration constant.

As a photosensitive layer that does not contain a colorant, the film thickness is 0°1~
Approximately 3 μm is sufficient.

In multilayer photosensitive layers, the photosensitive layers are sequentially provided on the support, but it is also possible to coat separate photosensitive layers on the support and on the protective film, and then laminate them. .

Next, known dyes and pigments are shown below, but these are just a few examples. These include organic pigments or dyes such as azo-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, indigo-based, and methine-based pigments, or inorganic pigments. For example, Lionor Yellow GRO (C, I 21090. manufactured by Toyo Ink Manufacturing ■), Nα1201 Lionor Yellow (〃),
N001206 Lionor Yellow (〃) 1 Lionor Yellow - 1208 (〃) No, 1305 Lionor Yellow - (C, 121100), No, 1306 Lionor Yellow (''), k1307 Lionor Yellow (〃), Lionor Yellow -FG1310 (〃),
Lionor Yellow FGN-T (C, 121105
), Nα7100 Lionor Yellow (C, I2109
6), Lionor Yellow-NBR (C, I 211
08), Brilliant Carmine 6BA (C011585
0:1), Lionor Red 6B4201 (〃
), Lionor Red 7B4401 (&), Brilliant Carmine 8BA (〃), Lionor Blue F
G7330 (C1I'74160), Lionor Blue FG7351 (l'), Lionor Blue C,X
-1 (〃), Mitsubishi Carbon Black MA-7. Mitsubishi carbon black MA-100 and the like are suitable. As the coloring substance, these substances may be used alone or in combination of two or more.

These dyes and pigments can be easily incorporated into the photosensitive layer through appropriate means.

The appropriate amount of pigment or dye added to the photosensitive layer is 5 to 50% (by weight) based on the total solid content, and if it is less than 5%, the amount of coating will be large to obtain the required concentration. If too much is used, the transferred image tends to deteriorate.

On the other hand, if it exceeds 50%, active light rays will not be sufficiently transmitted, causing scumming. In addition, the coating amount of the photosensitive layer is
0.5 g/rrr-10g/rrf, preferably I
g/'n (~5 g/rrr. Also, the photosensitive layer is
Coating can be performed using a coater such as a bar coater, knife coater, gravure coater, kiss touch coater, or the like.

In the present invention, various additives such as pigment dispersants, antisettling agents, leveling agents, and matting agents can be used in the photosensitive layer.

Furthermore, a protective film (cover sheet) is laminated on the photosensitive layer, but polyethylene film is a suitable material for the protective film because its adhesiveness to the photosensitive layer is weaker than that of a support such as polyethylene terephthalate film. Serves as a cover sheet. It is also known that in photopolymerization systems, the polymerization rate changes due to oxygen in the air, and to prevent this, a coating film such as polyvinyl alcohol is created on the two-colored photosensitive layer. Either method is effective, but when creating a coating film, the thickness of the film must be 5 μm.
If it becomes thicker than this, it will have a negative effect on the transferred image quality.

In the present invention, a method in which a protective film is laminated is more preferred.

In the present invention, an image forming method in which image exposure is performed from the support (mostly transparent) side is preferred.

This method significantly improves the positional relationship such as the orientation of one image, and provides a method that does not require a special intermediate image receptor for the purpose of correcting the orientation of the two images.

In the present invention, in the case of an image forming material having a protective film, the transparent support refers to a material that is peeled off after being pressed onto a two-image receptor, and two-image exposure is performed from the transparent support side.

The protective film provided as necessary prevents staining of the photosensitive layer from adhering to the exposure device, etc. when exposing the support for image formation, and reduces the effects of oxygen on the photosensitive layer. be.

In the color proofing work of printed matter to which the present invention is applied,
Highly accurate image reproduction from the original film, etc. is required. At the same time, there is also a need to shorten the time required for color calibration work. In order to meet these requirements and ensure stable finished quality, we need to ensure the accuracy of the reproduced image position and the correspondence between front and back sides.

It is preferable to carry out exposure from the transparent support side through a simple working process.

Hereinafter, one example of the process of using the present invention as an image forming material for color proofing, for example, will be explained in order.

(1) Provide holes for register pins in the color separation image mask and image forming material. Furthermore, if the image receptors are made of paper or the like, holes for register pins are also provided in these image receptors.

(2) imagewise exposure, that is, exposing the photosensitive layer to a color separation mask image using actinic radiation, such as ultraviolet radiation, sufficient to cure the imaging material;

(3) Next, peel off the protective film of the third image forming material.

The image receptor and the surface of the peeled colored photosensitive layer are placed so as to face each other, and transfer is performed under pressure and/or heat.

(4) By holding one end of the support and peeling it off, the image formed on the photosensitive layer is transferred to the image receptor, and 1/3 or an appropriate amount in the film thickness direction is supported by the preset internal concentration force. It is left on the body, forming a transferred image.

(5) Post-exposure is performed for the purpose of strengthening the adhesion to the entire surface of the transferred image and eliminating viscosity on the surface of the transferred image.

For example, in color proofing, steps (1) to (5) above are repeated four times (yellow, magenta, cyan, black) to obtain a four-color reproduced image.

In the present invention, as the step (3) above, it is also possible to press and bring them into close contact with each other in a two-dimensional manner depending on the conditions.

Preferably, transfer between roller nibs or pressure transfer using a manual printing machine is preferred. With this transfer method, contact, transfer, and peeling can be carried out quickly and stably, and temperature unevenness during heating is also less than when transferring on a flat surface.

Transfer is usually performed by applying pressure and heating, but when heating, it is preferable to heat the image receptor to such an extent that the image receptor used does not expand or contract significantly. For example, heating the roller to a surface temperature of 50 to 150°C, preferably about 60 to 100°C, gives preferable results by increasing the transfer speed and improving the reproduction accuracy of fine images. In other words, without causing problems such as swimming and gumming,
Good transfer is possible.

Further, in the transfer, a difference in surface temperature of the roller can be provided. For example, one roller can be heated and the other roller cooled.

As a device for performing the transfer, a conventional laminator or the like may be used to perform the transfer and peeling according to the present invention.

In the present invention, the complicated work of heat treatment before transfer and development by peeling, which is required in the prior art, is eliminated, and an image with a texture very similar to that of a printed material can be reproduced on an image receptor such as paper with a simple work.

The present invention will be explained below using Example 9 Synthesis Example.

In the examples, 1 part means part by weight, and 2% means % by weight.

First, an example of synthesis of a low melting point resin having an ethylenically unsaturated group used in the present invention will be illustrated.

Synthesis Example 1 Diacarna AP20B (α-olefin maleic anhydride resin manufactured by Mitsubishi Chemical Corporation) was placed in a four-bottle flask equipped with a stirrer, a thermometer, a reflux device, and a gas inlet tube.
Product name Solid content 50%, oxidation 270...100 parts 2-hydroxyethyl methacrylate...14.
8 parts dimethylbenzylamine ・・・・・・
・Bow, 96 parts hydroquinone ・
...... 0.1 part was charged, air was blown into the solution, the reaction was continued at 110°C for 16 hours, and the reaction was stopped at an acid value of 30. When the melting point of the obtained resin was measured, it was 47
Synthesis Example 2 at ~49°C Glycerintrier 2-hydroxystearard was placed in a four-loaf flask equipped with a stirrer, thermometer, reflux device, and gas inlet tube.
...940 parts Isocyanate ethyl methacrylate ...31
0 parts Hydroquinone ・・・・・・・・・
・・・ 0.5 part tin octylate ・・
...... 0.1 part was charged, air was blown in, and the reaction was carried out at 85°C for 4 hours. The peak at the infrared absorption wavelength of 2220 cm-' of the isocyanate group disappeared, so the reaction was stopped. . The melting point of the resulting resin was measured and was 35-5°C.

Synthesis Example 3 Hoechstwax S (oxidized wax manufactured by Hoechstwax Co., Ltd.: trade name) was placed in a four-bottle flask equipped with a stirrer, thermometer, reflux device, and gas inlet tube...................10
0 parts glycidyl methacrylate...Machi...
Part 38 Hydroquinone...Old...
・0.2 parts pyridine...
・・・・・・ 0.5 part was charged, heated to 120"C and reacted for 11 hours. The melting point of the obtained resin was 50-6Q
“It was C.

Example 1 A photosensitive liquid having the following composition was prepared.

Guitsu Dump (diallyl isophthalate prepolymer, manufactured by Osaka Soda ■: commercial name)... Old... 10.2
Part Foral 85 (fully hydrogenated rosin glycerin ester, manufactured by Rika 11-Cures ■: trade name) ■... 4 parts Resin of Synthesis Example 1 (solid content 55%) ......
・4-part dipentaerythritol hexaacrylate・
・・・・・・・・・ 6.8 Part Hensiphenon ・・・・・・・・・
0.45 parts 4.4 Bis-diethylaminobenzophenone...0°15 parts Hydroquinone...o,
o Ol part Carbon black MA-7 (manufactured by Mitsubishi Chemical Corporation ■) 3.0 parts Toluene ・・・・・・・・・
35.7 parts methyl ethyl ketone...
...35.7 copies again. Instead of carbon black as a pigment, use Yellow mm Onor Yellow-FG13.
10. Onorresodo 78FG4412 for magenta.
For cyan, yellow and red were used, respectively, using Onor Blue PC; 7330 (both manufactured by Toyo Ink Manufacturing Co., Ltd.).

A photosensitive layer solution for the lid was prepared. The usage ratio of pigments in each photosensitive layer was 18% for yellow, 18% for red, and 18% for indigo.

These four color photosensitive layer solutions were applied to 12μ polyethylene terephthalate film so that the dry film thickness was 2μ, and dried at 80°C for 2 minutes.A further 40μ polyethylene film was then laminated to form the four color image forming materials. Obtained. .

Accurately align the image forming materials of each of the four colors and the color separation positive film corresponding to these in a register bin, and then heat the 1.5 parts w ultra-high pressure mercury lamp (manufactured by Ushio Inc.) for 30 minutes.
Image exposure was performed for seconds (equivalent to 100 m j 7 cm").

Next, peel off the polyethylene film of the protective sheet.
The high-quality paper that is the image receptor and the photosensitive layer come into contact with each other in the nip between the rollers, are transferred, are peeled off, continue to be post-exposed, and then the next three colors are similarly transferred and post-exposed. 2 The finish was exactly the same as normal printed matter (printed matter from this machine). A faithfully reproduced image of 50 lines/mm was obtained, corresponding to the image on a color separation positive film.

In addition, the feed speed was 5 Qcm/min, and the nip pressure between the rollers was 4
Kg/cm2. The temperature of the upper roller is 48°.
C1 lower temperature was 97°C.

Further, the diameter of the upper and lower rollers is 150 mm.

The Shore hardness A of the upper roller is 70. The width of the transferred object is 260 mm, the contact distance, and the contact interval is 10
It is mm.

Comparative Example 1 A photosensitive layer solution was prepared with a composition other than the resin of Synthesis Example 1 used in Example 1, and an image forming material was obtained in the same manner as in Example 1. When the image was exposed in the same manner as in Example 1, the protective sheet I was peeled off, and an image was formed on high-quality paper as an image receptor. This time, when the image was similarly formed on art paper, the finish was the same as that of ordinary printed matter.

Example 2 An image was formed on newspaper in the same manner as in Example 1, except that the same amount of the resin from Synthesis Example 2 was used in place of the resin from Synthesis Example 1, and the finish was exactly the same as that printed by this machine. Ta.

Example 3 Images were formed on newspaper in the same manner as in Example 1, except that the same amount of the resin from Synthesis Example 3 was used in place of the resin from Synthesis Example 1, and the finish was exactly the same as that printed by this machine. .

Example 4 (Photosensitive layer 1) Daitsu Dump...21.
23 parts dipentaerythritol hexaacrylate...
・・・・・・70.8 parts Benzophenone・1 Old・・0.5 parts 4.4 Bis-diethylaminobenzophenone・・・・
...0.17 parts Hydroquinone ...0.
001 parts Carbon black MA-7 (manufactured by Mitsubishi Chemical Industries, Ltd.) 5.0 parts Toluene ・1 Old ・38.0
Methyl ethyl ketone
・40.0 copies again. Instead of carbon black as a pigment, use Yellow mm Onol Yellow-FG1310. Onor Red 78FG4412 for magenta. For cyan, I used Onor Blue FG7330 (all manufactured by Toyo Ink Manufacturing) for yellow and red, respectively.

A photosensitive layer solution for the lid was prepared. The usage ratio of pigments in each photosensitive layer was 18% for yellow, 18% for red, and 18% for indigo.

This photosensitive layer solution was applied to each 12μ polyethylene terephthalate film using a bar coater so that the dry MW was 2μ, and was dried by irradiation for 30 seconds under an infrared lamp (3 parts w) to form a positive photosensitive layer. Created. Four color imaging materials were obtained.

(Photosensitive layer 2) Gui soda knob ・Old...10
．． Part 2 Foral 85...
・Resin of 4-part synthesis example 1 (solid content 55%) ・Old...
...4 parts dipentaerythritol hexaacrylate...6.8 parts benzophenone ・n1・・0.45
Part 4.4 Bis-diethylaminobenzophenone...
・・・・・・0.15 parts hydroquinone ・・・・・・o,
o o 1 part Carbon black MA-7 (manufactured by Mitsubishi Chemical Corporation ■) 3.0 parts Toluene 35.
7 parts Methyl ethyl ketone ・・・・・・
...3 s, 7 parts again. Aunor Yellow FG13 is used as a pigment instead of carbon black.
1.0 Aunor Red 78FG441 for magenta
2. For cyan, I used Onor Blue FG7330 (all manufactured by Toyo Ink Manufacturing) for yellow and red, respectively.

A photosensitive layer solution for the mold was prepared. The usage ratio of pigments in each photosensitive layer was 18% for yellow, 18% for red, and 18% for indigo.

These four color photosensitive layer liquids were each coated on a polyethylene film (thickness: 40 .mu.m) using a bar coater so that the dry film thickness was 2 .mu.m, and dried.

(Preparation of Image Forming Material) The films of the same color of the photosensitive layers 1 and 2 were laminated together at 30''C so that the photosensitive layers 1 and 2 were in contact with each other to obtain respective image forming materials.

Image exposure, peeling of the polyethylene film, transfer, and post-exposure were carried out in the same manner as in Example 1, and the finish was exactly the same as that of a normal printed matter (printed matter of this machine). A faithfully reproduced image of 50 mm/mm was obtained, corresponding to the image on the color separation positive film.

Comparative Example 2 An image forming material without the photosensitive layer 2 of Example 4 was obtained. When an image was formed on high-quality paper in the same manner as in Example 4, only a portion of the halftone dots were attached to the high-quality paper.

The concentration was insufficient and the appearance was faded.

This time, when an image was similarly formed on art paper, the finish was equivalent to that of ordinary printed matter.

Example 5 Images were formed on Shinkai paper in the same manner as in Example 4, except that the same amount of the resin from Synthesis Example 2 was used in place of the resin from Synthesis Example 1, and the finish was exactly the same as that printed by the first machine. Ta.

Example 6 An image was formed on newspaper in the same manner as in Example 4, except that the same amount of the resin from Synthesis Example 3 was used in place of the resin from Synthesis Example 1, and the finish was exactly the same as that printed by this machine. .

〔Effect of the invention〕

According to the present invention, the reproduction of the image transferred in the prepress proof used in the process between plate making and printing is stable, and the transferred image has uneven reflection density and periodic patterns: fine directional patterns. It has excellent 2M 4-point reproducibility and 9-color reproducibility, and even on image receptors with rough surfaces, images equivalent to the proof prints made by one proof printing machine can be obtained, making it possible to omit proofing by a proof printing machine. It is.

Claims (1)

[Claims] 1. A photosensitive layer containing a dye and/or pigment is formed on a support, imagewise exposed, and the difference in tackiness between exposed and unexposed areas of the photosensitive layer is determined. 1. An image forming material for transferring an image to an image receptor such as paper, wherein the photosensitive layer contains a low melting point resin having an ethylenically unsaturated group that is solid at room temperature. 2. The photosensitive layer is a thermoplastic resin, an ethylenically unsaturated compound, a low melting point resin having an ethylenically unsaturated group that is solid at room temperature,
The image forming material according to claim 1, characterized in that it contains a pigment and/or a dye and a photopolymerization initiator. 3. A plurality of photosensitive layers, at least one layer containing a pigment and/or dye, and the photosensitive layer in contact with the image receptor containing a low melting point resin having an ethylenically unsaturated group that is solid at room temperature. The image forming material according to claim 1, characterized in that: