JPH0290165A - Image forming material - Google Patents

Abstract

PURPOSE:To prevent electrostatic charging of an image forming material itself, attraction of dust, and the like at the time of transfer, and deterioration of the quality of a transferred image by giving conductivity to a transparent substrate and enabling imagewise exposure from the side of the substrate. CONSTITUTION:A photosensitive layer containing a dye and/or a pigment is located on a transparent substrate in an image forming material and conductivity is given to the substrate, thus permitting occurrence of static electricity at the time of removing a mask original from the image forming material or peeling of a protective film after imagewise exposure and the like trouble to be prevented, and problems of attraction of dust from the air, resulting severe deterioration of image quality, and shocks given to human bodies due to occurrence of static electricity to be solved in the operation when a prepress brief is formed.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention relates to the formation of an image, and more specifically, to the formation of an image, and more specifically, to the difference in tackiness between exposed and unexposed areas of a photosensitive layer. The present invention relates to an image forming material formed by superimposing monochrome or multicolor images using a 9-color proof subprint prepress proof, which can produce a transferred product that is completely similar to a printed material.

(Prior Art) Conventionally, in the printing industry, it has been generally known to use one-proof printing or prepress proofing as a means of confirming the two-tone finish of the final printed matter before printing. ing.

Bripress proofing has the advantage of being able to predict the finish of the final printed matter without using printing ink, and can be used with overlay methods, subprinting, etc. depending on the final image quality and various objectives in the platemaking and printing processes. Different methods are used.

In the overlay method, a transparent paste film has a photosensitive layer containing a coloring material corresponding to each color separation mask, and this film and mask are brought into close contact, exposed to light, and developed.

The respective films are superimposed and calibrated.

However, since this method has no choice but to use transmitted light, it has the disadvantage that, although it is low cost, it is not possible to determine the delicate balance of one color and gradation.

Unlike the overlay method, the subprint method provides a hard copy, so it has high utility value and has been reported in US Pat. No. 3,060,023, US Pat.
t? on a single support as described in No. 3,060,025. 1. There is a method in which photopolymer photosensitive layers are laminated to sequentially form separate color images. In this example, a color toner is used as the first coloring substance, and it can be said to be an excellent blimp proof in that it faithfully reproduces the original mask, but as the photosensitive layers are laminated, diffused reflection in non-image areas occurs. The gloss is extremely high compared to the actual printed matter, and the W feeling is quite different. Furthermore, since the cured surface after exposure to light is not flexible, cracks are likely to form on the surface depending on the storage conditions. Furthermore, when applying one color, the color toner scatters, which is not desirable from the viewpoint of work hygiene.In these methods, when further transferring and laminating the photosensitive layer, the i3-light support must be peeled off. First, the static electricity generated at this time is so strong that it temporarily shocks the human body. Furthermore, because this static electricity sweeps away dust from the surrounding work environment, the finished proof has a lot of dirt and the image quality is poorer than that of printed matter.Therefore, this method is not accepted as a final proof.

In addition, two-part Japanese Patent Application Publication No. 59-97410 and 61-1
There are also bripress proofs that can be used for both the overlay method and the subprint method as described in Japanese Patent No. 88537. The advantage of this method is that depending on the purpose of use, if you want to simply check characters, etc.
Check just the overlay.

If you need a hard copy to check delicately colored areas such as patterns, you can just transfer it to the object, which is very versatile. However, since a developing step using an organic solvent is required, there is a drawback that the working environment is poor. Furthermore, regarding the images obtained. Although it is possible to transfer to any object to be transferred, a transparent photosensitive intermediate layer is interposed between the object to be transferred and the colored photosensitive layer, and the object to be transferred and the colored photosensitive layer are adhered to each other. Because of this layer, 1
The reflected light is diffusely reflected, and it is inevitable that the finished product will be quite different from the actual printed matter. Even this method has the fatal and decisive flaws mentioned above, so it cannot be called an excellent proofreading method.

Therefore, image-forming materials that do not require a development process are useful in terms of workability and safety, but as shown in the above examples, conventional image-forming materials cannot be used with either method. However, the density and gloss of the images obtained were different from those of printed matter using the original ink, and the finished quality was also inadequate.

(Problem to be Solved by the Invention) The present inventor formed a photosensitive layer containing a dye and/or pigment on a transparent support, exposed it to one image, and separated the exposed and unexposed areas of the photosensitive layer. The image forming material used to transfer the image to an image receptor such as paper, which causes a difference in adhesion during transfer, is completely different from the conventional bripressproof, and there is no contact between the printing material and the image forming material. It has already been found that since there is no intervening layer such as the M layer, images and textures exactly the same as those of actual printed matter can be reproduced.

However, if the image forming material itself is insulative, static electricity will be generated, which may attract dust and the like during transfer, reducing the quality of the transferred image.

The present invention aims to prevent the image forming material itself from being charged with static electricity, and to reduce the thickness of the transparent support to 0.020 mm.
The present invention relates to a material that can faithfully reproduce the image of the original film and obtain the best transferred image quality by making it less than mm.

(Means for Solving the Problems) An object of the present invention is to provide an image forming material in which a photosensitive layer containing a dye and/or pigment is present on a transparent support, by imparting conductivity to the transparent support. The surface electrical resistance of the transparent support provided with .

This is achieved by ensuring that the resistance is 1010 Ω or less and that the thickness of the transparent support is 0.020 mm or less. A transparent support may also be used.

Suitable materials for this transparent support are those that are stable against heat, chemicals, light, etc., and are sufficiently transparent to actinic rays. Examples include films or sheets of cellulose acetate, polystyrene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, polypropylene, and the like. In particular polyethylene terephthalate films or sheets.

Particularly preferred is a polyethylene terephthalate film or sheet from the viewpoints of transparency, thermal stability, one-dimensional stability, and the like.

In order to impart electrical conductivity to the transparent support, a conductive substance may be contained in the transparent support, or may be coated on either one of the transparent supports. One method is to make the surface a cloak.

Note that surface resistivity (Ω) is one measure of the chargeability of plastic films, and polyethylene films, polypropylene films, polyester films, etc. generally exhibit large values of 1010Ω to 10IfΩ.
Easily charged. Generally, it is said that when the value is less than to''Ω, it is difficult to be charged.

Specifically, conductive substances (antistatic agents) include the following.

Naphthalene sulfonate as an anionic antistatic agent,
Examples include acetals derived from polyvinyl alcohol containing sulfonic acid groups, 2-methylene carboxylic acid esters, and water-soluble polysulfonamides.

As a cationic antistatic agent, 1-octadecyl-5
-Methylbisgeanide hydrochloride, salt of dibutyl phosphate and tetraethylenepentamine, etc. are representative.

As a nonionic antistatic agent, higher alcohol EO
(ethylene oxide) adduct, fatty acid sorbitan ester EO adduct, etc.

Water-soluble polymeric substances are also used as antistatic agents in combination with electrolytes, such as CMC, acetylcellulose, a product obtained by reacting chloroacetylcellulose with diethylamine, and a copolymer of vinyl acetate and maleic anhydride. . Most of the above are water-soluble surfactants, and can be degraded over time, washed with water, etc.

The antistatic effect is reduced.

Preferably, the antistatic agent is a permanent antistatic agent that has a durability Tj that is not affected by washing with water, aging, friction, etc.

Examples of anionic permanent antistatic agents include copolymers of styrene and styrene undecanoate, copolymers of fatty acid vinyl ester and maleic anhydride, and the like.

Examples of the cationic permanent antistatic agent include salts obtained by quaternizing vinylpyridine polymers and copolymers, such as quaternary ammonium salts of polyvinylpyridine.

In addition, the surface of the film can be roughened to make it uneven, or the surface of the film can be coated with a matting agent to make it matte, reducing the contact area between the film surface and other surfaces, or changing the position of the electrification series to reduce the generated charge. There are ways to reduce it.

It will be even more effective if you coat or knead it with an antistatic agent.

However, since this treatment results in a decrease in the transparency of the film, care must be taken in the type of substance and blending method.

In order to provide a conductive layer on a transparent support, these materials are prepared by dissolving them in a suitable solvent.

It can be obtained by coating on a transparent support and drying.

When coating a conductive layer, there are various commonly used coating methods, such as air doctor coating, rond coating,
Floating knife coater, squeeze coater, 3-roll reverse roll coater, 4-roll reverse roll coater, gravure coater, kiss roll coater, bead coater, spray coater, spin coater, etc. can be used.

Among these, gravure coaters and kiss roll coaters are particularly preferred in terms of obtaining a uniform thin film.

The thickness of the conductive layer coated on the transparent support is O, Ig/m2 ~
A range of 10 g/m'' is appropriate, but 1 and more preferably 0
．． A range of 5 g/m" to 2.0 g/m" is preferable. In addition, if the transparent support itself is a conductor, that is, the conductive layer is contained in the same or different plastic material as the support film, and if they are co-extruded at the same time as the support film, the adhesiveness and scratch resistance will be reduced. Because an excellent conductive layer can be easily obtained.

In this case, there is no need to apply the above-mentioned antistatic agent, and this is a particularly preferred form of the conductive layer in the present invention.

The thickness of the transparent support is carefully selected in order to greatly contribute to image reproduction in order to obtain a proof using the image forming material I'l of the present invention.

The imaging materials of the present invention are usually in the form of a transparent support/multiple photosensitive layers including a colored photosensitive layer/protective film.

This protective film is a film that is removed after image exposure through a mask (color separation film, etc.), and is used to prevent stains caused by adhesion of the photosensitive layer to the exposure machine etc. when exposing the image through the mask, and to prevent exposure to light. This layer exists to preserve the image layer and does not exist during transfer to a two-image receptor.

This protective film includes polyethylene film,
Polypropylene film 1 Examples include polyethylene terephthalate film and polytriacetate film.

Among these, polyethylene film has a high rigidity and
In terms of oxygen permeability, 9 expansion/contraction ratios, 1 surface smoothness, adhesion, etc.
Particularly preferred.

The photosensitive layer according to the present invention consists of two layers, or three or more layers, and at least one layer contains a colorant. A coloring agent may be contained in all the photosensitive layers.

Materials that can be applied to the photosensitive layer of the image forming material of the present invention include (a) a photopolymerizable compound and a colorant (which may not contain a colorant) (b) a photopolymerizable compound, a thermoplastic resin, and a colorant As additives, photopolymerization initiators, photopolymerization accelerators, thermal polymerization inhibitors, plasticizers, pigment dispersants, etc. are used in combination.

As the photopolymerizable compound, at least one selected from hexamers, oligomers, and prepolymers can be used.

The photopolymerizable compound is not particularly limited, but preferably one that can plasticize the thermoplastic resin at room temperature.

Typical compounds include 2-hydroxyethyl (meth)acrylate, ethylene glycol diacrylate,
Diethylene glycol diacrylate-1.

1.6 Hexanediol di(meth)acrylate - trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, etc., one or two of these ethylenically unsaturated compounds as necessary The above may be used.

As the thermoplastic resin (organic polymer binder), a thermoplastic, non-photopolymerizable polymer that has excellent compatibility with photopolymerizable compounds can be used. For example, polyvinyl chloride,
Poly(meth)acrylic acid ester.

Epoxy resin, polyurethane resin, cellulose derivative,
(Example: Eva, ethyl cellulose, cellulose acetate nitrocellulose) Synthetic rubbers such as vinyl chloride-vinyl acetate copolymer, polyamide resin, polyvinyl acecool resin, diallyl phthalate resin, butadiene-acrylonitrile copolymer, etc., have the required physical properties. Accordingly, one or two types of these thermoplastic substances may be included.

As photopolymerization O11 initiators, those that have low absorption mainly in the visible light region, those that have good compatibility with the photopolymerizable compound, and those that have a photochemically intersystem crossing efficiency close to 1 are used. Preferred examples include benzophenone benzoin ethyl ether thiozanzone, 2-methylthiozanzone, 2-ethylthiozanzone, and 2-(sopropylthiozanzone).

4°-isopropyl-2-hydroxy-2-methylpropiophenone, etc., and in order to further increase the photopolymerization initiation efficiency. A combination of photopolymerization accelerators may be used. This photopolymerization accelerator is aromatic.

Aliphatic tertiary amines and the like are known. Examples include ethyl ketone, 4,4'-bisdiethylaminohenzophenone, and the like. What is the accelerator? Depending on the material, the amount may vary by 51 yen, so the selection is made taking into consideration promotion efficiency, yellowing, compatibility with the initiator, and the energy wavelength range of the active light to be used.

Most of the thermal polymerization inhibitors are aromatic derivatives.9 The important things in selecting a thermal polymerization inhibitor are the amount added and compatibility, and 9 they must not interfere with the generation of radicals for photopolymerization. At the same time, radicals must be suppressed thermally. What is generally used so far? Hydroquinone 2 p-methoxyphenol,
Examples include L-butylcatechol and pyrogallol. however,
The inclusion of non-aromatics does not control the invention.

Colorants commonly used in photosensitive layers include dyes and pigments. Examples of typical organic pigments are shown below.

Lionor Yellow-FG1310 (C, 1.211
00).

Lionor Yellow-1”GN-T (C. 1.
2 1 105).

Lionor Yellow-1208 (C.1.21090
).

No. 7100 Lionol Ixo-(C, 1.2109
6).

Brilliant Carmine 6BA (C, I, 1585omi
).

Brilliant Carmine 8BA (〃) Lionollend C3110-X (C, 1, 15585
:1) Lionor Blue~SM (C, 1,74160).

Lionor Blue FC, 7330 (〃).

Lionor Blue FG7351 (〃) Lionor Blue FG7345 (〃) The above are manufactured by Toyo Ink Manufacturing Co., Ltd. Also.

MA-7 MA-100° #50° #55 #52° #45° #32° #30 The above carbon blacks are manufactured by Mitsubishi Kasei Corporation. The coloring agent is typically one or more examples, but it is not limited to this example since it is common practice to mix several dyes and pigments to obtain the required hue.

The pigment or dye added to the photosensitive layer is suitably 5 to 50% (by weight) of the total solid content, more preferably 9% to 50% (by weight) of the total solid content.
~20% is preferred.

The transparent support side of this image forming material and the image surface of the mask original plate are brought into close contact, image exposure is performed from the mask side, the mask original plate 1 and the protective film are removed, and the photosensitive layer and the transfer target are heated between Ninpro rolls. By performing the transfer process while transferring, it is possible to obtain a transferred product that is exactly the same as the printed matter.

In other words, since the photosensitive layer closest to the transparent support undergoes delamination, which is exactly the same as the printing principle of normal offset printing, it is possible to obtain high-quality transfers, unlike conventional bripress printing.

However, 5. When creating this bripress blueprint.

When the mask master must be removed from the image forming material, static electricity is generated and attracts dust from the atmosphere, resulting in a significant deterioration in image quality. Furthermore, shock to the human body due to the generation of static electricity is unavoidable.

The mask master used here usually refers to a developed positive or negative film.

As mentioned earlier, if conductive treatment is applied, there is no need to worry about static electricity being generated.

However, since it is not appropriate to conduct conductive treatment on the mask original plate in view of normal printing processes, it is more appropriate to pre-treat the image forming material of the present invention.

Further, when one-image exposure is applied from the transparent support side, the thicker the transparent support is, the more the exposure light is diffracted and a smaller image is formed compared to one original image.

Therefore, the transparent support used in the present invention is preferably as thin as possible in order to faithfully reproduce the original mask. Particularly 0.05 mm or less, more preferably 0
．． A transparent support of 0.02 mm or less is suitable.

(Effect of the invention) When creating a bripress blue, when removing the mask original from the image forming material, or after image exposure, when removing the protective film, static electricity is generated and attracts dust. This eliminates the significant deterioration of image quality and the shock to the human body caused by static electricity.

Also, by defining the thickness of the transparent support.

The image-forming material of the present invention makes it possible to provide transfers that are exactly the same as ordinary printed matter.

The present invention will be described in more detail below with reference to Examples, but the present invention is not limited thereto. In example.

Parts refer to parts by weight.

Example 1 It consists of the following composition. A conductive layer adjustment solution was prepared.

Fusashiwa' ±9 Kao Electro Stripper QN (manufactured by Kao Corporation) 1 part isopropyl alcohol 50 parts ethyl alcohol 49 parts Fusashiri γ
Electro Stripper N (manufactured by Kao Corporation) 2 parts toluene 52 parts xylene 46 parts Electrostripper N (manufactured by Kao Corporation) 0.5 parts toluene 53.5 parts xylene 46 10 parts toluene 45 parts xylene 45 parts trial edition A'Yonju Tsume Colco 11'J-103X (manufactured by Nippon Colcoat Co., Ltd.) ) 2 parts isopropyl alcohol 70 parts ethyl alcohol 28 parts Wipe A-L
Shikakai Statysite (manufactured by Betsu Sangyo Co., Ltd.) 1 part methyl ethyl ketone 30 parts toluene 69 parts or more of different conductive layer adjustment liquids were stirred and dissolved using a disper.

Each of these adjustment solutions was coated with a polyethylene terephthalate film, E-5100 (manufactured by Toyobo Co., Ltd.) with a thickness of 0.0
The conductive layer was coated to a thickness of 12 mm so that the thickness of the conductive layer after drying was 0°002 mm.

After that, these films were tested with a super insulation resistance meter, T
Surface electrical resistance (R8601N stock) Atopan test)
Ω) was measured. Furthermore, Amesh test was also conducted on these samples. Ashtes 1-
is a simple test method to determine the presence or absence of static electricity. In other words, place an appropriate amount of cigarette butts on a Petri dish, rub the sample with a cotton cloth, and immediately place it 3 cm above the Petri dish.
Get as close as possible.

This is a method of determining whether static electricity is generated or not based on whether or not cigarette butts are attracted. The results are shown in Table 1. Therefore, as a conductive layer, if it is too small, it will not be practical.

On the other hand, a test similar to the previous test was also conducted on a sample in which the conductive layer and the transparent support were integrated in advance.

Wipe Uni L□□□Kisei Q-21 (manufactured by Toshishiku Co., Ltd.) 1. Thickness: 12 μm.
2 From the results in Table 2, there is no significant difference in film thickness.

From these results, if the resistance value is 1010 or less,
It is clear that static electricity is unlikely to occur.

Example 2 A colored photosensitive layer liquid having the following composition was prepared: 22 parts of 6-diallylisophthalate brevolimer (manufactured by Osaka Soda Co., Ltd.), 7 parts of KAYARAD-DPHA (manufactured by Memoto Kayaku Co., Ltd.), Hensiphenone (manufactured by Memoto Kayaku Co., Ltd.) Daiichi Kasei Co., Ltd.) 0,
5 parts EAB (manufactured by Hodogaya Chemical Co., Ltd.) 0.2 parts MA-
7 (manufactured by Mitsubishi Kasei Corporation) Part 3 R-52 (
(manufactured by Hoechst Japan Co., Ltd.) 1 part methyl ethyl ketone 40 parts toluene
10 parts xylene
10.3 parts of the obtained coating solution was applied to various transparent supports of Example I using a spin coater on the side opposite to the coated conductive layer so that the dry film thickness was 1.5μ, and coated with a protective film. A certain polyethylene film, N~5l-P(
A 40μ film (manufactured by Tamabori Co., Ltd.) was attached to the colored photosensitive layer side using a laminator to obtain the desired image forming material.

The transparent support side of this image forming material was brought into close contact with the silver salt side of the original positive mask.
B (manufactured by Oak Seisakusho Co., Ltd.) was used to apply actinic rays of 50 mj/cm". The image forming material and the original positive mask were peeled off, and the protective film was further peeled off, and a first laminator (manufactured by Taisei Laminator Co., Ltd.) was applied. A double-sided art paper, Shiga Art 110 kg (manufactured by Mitsubishi Paper Mills Co., Ltd.) was brought into close contact with the image forming material with the protective film removed, and a pressure of 4 kg/
The transfer was carried out using the nip between the rollers under the conditions of "cm", passing speed of 50 cm/min, and roller surface temperature of 70'C.The table also shows the number of pinholes that occurred due to the adsorption of dust on the transferred material. Shown in 3.

Table 3 For the transfer density shown in Table 3, RD-918 (manufactured by Macbeth) was used. Also, the image resolution was determined based on the highlight area (1%) of the original positive mask.

Can be reproduced 　　　　○ Cannot be reproduced × was the standard.

Examples 1 and 2 demonstrated the effect of conductive treatment on the transparent support and the effect of the thickness of the transparent support on image reproducibility.

Claims (1)

[Claims] 1. A photosensitive layer containing a dye and/or pigment is formed on a transparent support, imagewise exposed, and the tackiness of the exposed and unexposed areas of the photosensitive layer during transfer is determined. An image forming material for transferring an image to an image receptor such as paper, which is characterized in that a transparent support is imparted with conductivity that enables image exposure from the support side. material. 2. The image forming material according to claim 1, wherein the transparent support has a surface electrical resistance of 10^1^0 Ω or less. 3. The image forming material according to claim 1 or 2, wherein the transparent support has a thickness of 0.020 mm or less.