JPH0568691B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a photosensitive resin plate material for plate making, which allows plates such as printing plates and stamps to be easily manufactured. Conventional photosensitive resins for plate making come in film form and liquid form, and plate making using liquid photosensitive resin generally requires large-scale equipment, but it can be made by hand. In some cases, an object such as a negative film or an image that contrasts in brightness with the original is placed on glass or other transparent sheet or film, a transparent protective film is placed on top of the photosensitive resin, and a photosensitive resin is poured over the base. Cover with a film, place a transparent glass plate on top of it, expose it to light using an ultraviolet lamp, etc., wash out the uncured resin in the non-exposed areas using water, alkaline water, or other solvents, dry it, and then dry it. The required resin plate is obtained by exposure. However, in the above operation, air bubbles may be introduced into the photosensitive resin, too much or too little resin may be injected, and the troublesome operation of injecting the resin into the frame and inserting transparent films on both the top and bottom surfaces is required. It requires a lot of effort and skill. In the present invention, the required amount of photosensitive resin is sealed in a flat container with a transparent container wall, and there is no fear of air bubbles entering the resin or injecting too much or too little. Plate making can be done easily without requiring any effort or skill. To explain the present invention with reference to an embodiment, a flat container 1 containing a photosensitive resin has a container wall 2 which is in contact with an image such as a negative film, and an outer surface which is in contact with the image has removability with respect to the image. A vessel wall 3 facing the inner surface is formed of a transparent and flexible synthetic resin film that is removable to the photosensitive resin and the resin after exposure.
is formed of a transparent and flexible synthetic resin film that has adhesive properties to the photosensitive resin (after exposure) sealed in the container. If the film forming the vessel wall 3 does not adhere to the photosensitive resin, it will easily peel off during work such as washing out the resin in non-exposed areas, making the work unstable and extremely difficult. Further, it is preferable that the film constituting the vessel wall has good heat sealing properties. The film constituting the container wall 2 includes polyolefins such as polyethylene, polypropylene, and other films having the same effect, and the film constituting the container wall 3 includes, for example, chlorinated polyethylene, chlorinated polypropylene, chlorosulfonated In addition to polyethylene, chlorosulfonated polypropylene, etc.
A synthetic resin film that has been surface-treated by applying chlorinated or chlorosulfonated polyethylene or polypropylene to at least the surface in contact with the photosensitive resin can be used. Both of these films are formed to the required size according to the amount of resin to be accommodated, and the container 1 is formed by overlapping both films, leaving an opening and heat-sealing the edges. A certain amount of photosensitive resin 4 is poured using a vacuum filling device or the like so as not to contain air bubbles and leave no air space between the container wall and the resin, and the opening edge is sealed by welding or the like and exposed to light. A synthetic resin plate material 5 is obtained. 6 is a welded portion on the periphery. For example, in the photosensitive resin sealed in the container, the uncured resin in the non-exposed area invented by the present inventors becomes an emulsion in water etc. and dissolves, and the interface with the cured resin in the exposed area becomes cloudy, causing the uncured resin to become cloudy. There is a method that makes it easier to determine the end point of the process. This photosensitive resin has at least one acryloyl group CH ₂ =CHCO- or methacryloyl group at the terminal or side chain.
A water-soluble prepolymer having CH ₂ =C(CH ₃ )CO-, a water-insoluble prepolymer such as a vinyl ester type, an acrylic type, or/and a water-insoluble substance selected from the above-mentioned water-insoluble monomers, and photosensitization. It contains appropriate amounts of each agent. In this case, the resin obtained by blending and uniformly mixing the above-mentioned water-soluble prepolymer, water-insoluble substance, and photosensitizer is such that when the resin is exposed to light and washed out with water, the resin in the unexposed areas becomes an emulsion. It is formulated to dissolve and whiten at the interface with the resin in the exposed area. Generally, the above blending ratio is 100 parts (parts by weight, the same applies hereinafter) of the water-soluble prepolymer to 5 to 5 parts of the water-insoluble material.
15 parts, 0.1 to 40 parts of photosensitizer, preferably 5 to 100 parts of water-insoluble substance per 100 parts of water-soluble prepolymer.
parts, and 0.5 to 30 parts of photosensitizer. The above composition may optionally be selected from diacetone acrylamide, N-vinyl-α-pyrrolidone, α-hydroxyethyl methacrylate, α-hydroxyethyl acrylate, acrylamide, isobutyl vinyl ether, dimethylaminoethyl methacrylate, methoxypolyethylene glycol methacrylate, etc. A predetermined amount of at least one water-soluble monomer is blended for the purpose of dilution, etc., to appropriately adjust the viscosity of the composed resin to make it easier to handle, and to prevent clouding of the interface with the cured resin during washing after exposure. It is possible to adjust the strength and the physical properties of the plate to be formed. The above water-soluble prepolymers having acryloyl or methacryloyl groups include polyethylene oxide, polyethylene glycol, sodium polyacrylate, polyacrylic acid, polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, carboxymethyl starch, and polyacrylamide. , polyvinylpyrrolidone, polyamine, water-soluble polyester, water-soluble polyepoxy, viscose, gelatin, collagen, etc., at the end or side of a water-soluble (pre)polymer having a carboxyl group -COOH, a hydroxyl group -OH, or other functional groups. A water-soluble (pre)polymer having at least one acryloyl group or methacryloyl group in the chain and having the above-mentioned carboxyl group, hydroxyl group, or other functional group is used, and glycidyl acrylate, acrylic acid, or glycidyl methacrylate is used. It is obtained by adding a required amount of a compound having an acryloyl group or a methacryloyl group, such as acrylate or methacrylic acid, and reacting it under predetermined treatment conditions in the presence of a catalyst. Examples of the vinyl ester-based and acrylic-based water-insoluble prepolymers include polyester acrylate, epoxy acrylate, polyurethane acrylate, polyether acrylate, oligoacrylate, alkyd acrylate, polyol acrylate, and vinyl ester. Examples of water-insoluble monomers include trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, tetramethylolmethane triacrylate, tetramethylolmethanetetraacrylate, tetraethylene glycol diacrylate, and triethylene glycol. diacrylate, polyethylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate,
α,α′bis(4-acryloxydiethoxyphenyl)propane, tripropylene glycol diacrylate, ethylene glycol dimethacrylate, mono(2-acryloyloxyethyl) acid phosphate, mono(2-methacryloyl) (oxyethyl) acid phosphate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, stearyl methacrylate, lauryl methacrylate,
Examples include 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, ethyl carbitol acrylate, methyl triglycol acrylate, butoxyethyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, and the like. Further, the following photosensitizers can be appropriately selected and used as the photosensitizers to be mixed with the water-soluble prepolymer and the water-insoluble substance. p-isopropyl-α
-Hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2,2-dimethoxy-2
-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, benzoin isobutyl ether, benzoin isopropyl ether,
p-tert-butyltrichloroacetophenone, p
-tert-butyldichloroacetophenone, n-butyl or isobutylbenzoin ether, 1-phenyl-1,2-propanedione-2-(O-ethoxycarbonyl)oxime, 2-chlorothioxanthone, 2-methylthioxanthone, dibenzos Veron, α,α-dichloro-4-phenoxyacetophenone, 2-ethyl anthraquinone, benzyl, benzoin ethyl ether, CTX,
RTX, MBP, DMBI. Formulation examples of the water-soluble prepolymer, water-insoluble prepolymer or water-insoluble monomer, photosensitizer, and water-soluble monomer constituting the above photosensitive resin, and plate making using the photosensitive resin of each formulation example. water washability (degree of white turbidity at the interface between exposed and non-exposed areas),
The stability of the resulting letterpress (the shape of the letterpress mold remaining after washing out the resin in the non-exposed areas and its retention) and the workability (difficulty in washing out the resin in the non-exposed areas with running water) are shown in the following table. be.

[Table] (1) Water washability in the above table indicates that when the unexposed resin is washed away with water, the interface with the exposed resin becomes white.○
A slightly white mark is indicated by a △ mark. (2) The stability of the relief is indicated by ○ if the shape of the exposed resin (letterpress) that remains after washing the unexposed resin with water is stable, and △ if the shape is slightly deformed. (3) For workability, when washing the unexposed resin with running water, those that are extremely easy to wash with water are marked with ○, and those that take a little time are marked with △. Examples of photosensitive resins other than those listed above include APR
Liquid photosensitive resins commercially available under the trade names of resins and other liquid photosensitive resins can be similarly used. Also, a solid photosensitive resin in the form of a sheet or the like can be used similarly. An example of a method for manufacturing a plate, such as a relief plate, using the photosensitive resin sealed in this container will be described below. A glass plate 11 of an appropriate size is placed on a stand, and a negative film 1 is placed on the glass plate 11 so as to form a normal image.
A photosensitive positive resin plate material 5 is placed on top of the photosensitive resin plate material 5 with the device wall 2 facing the negative film. A glass plate 13 is placed and spread uniformly so as to maintain the thickness and prevent uneven distribution. In this case, it is preferable to insert a spacer 14 approximately corresponding to the thickness of the plate to be formed at the peripheral edge between the glass plate 13 and the glass plate 11 or at one of the opposing edges. Next, the edges of the upper and lower glass plates 11 and 13 are held and fixed with clips 15 or the like (FIG. 3), and these are placed in the exposure device 20 for exposure (FIG. 4). Hereinafter, as in the conventional method, the exposure is first from the glass plate 13 side for a short time, then from the glass plate 1 side.
Start from the first side for a relatively long time. The exposure time is approximately 1 mm thick for the resin layer (the vertical and horizontal dimensions of the resin layer are approximately 5 cm x 7.5 cm).
cm), when using an exposure device with two 6W moth attracting lamps, from the glass plate 13 side for about 10 to 13 seconds.
In many cases, exposure for about 180 seconds from the glass plate 11 side is sufficient. After the exposure is completed, remove the glass plates on both sides, pick up the plate material 5, cut off its peripheral edge 6 (Fig. 5), peel off the vessel wall 2 from the resin surface, and remove the vessel wall to which the exposed photosensitive resin is adhered. 3 with your fingertips, and for example, in the case of a photosensitive resin with a formulation example displayed, pour tap water 17 from the faucet onto the resin to wash away the unexposed portion of the resin (Figure 6). .
The exposed and hardened resin portion 8 remains as a convex surface, and when the interface 18 becomes cloudy, water washing is stopped and water is drained (FIG. 7). This cloudy interface becomes transparent when dried using hot air or the like. After drying, the plate is placed on, for example, a glass plate 19 with the container wall 3 side facing down, and exposed to light using an exposure device 20 to obtain the desired resin plate 7 (FIGS. 8 and 9). By using the photosensitive resin plate material as described above, the plate making operation can be performed easily without requiring much effort or skill, and a resin plate with an excellent finish can be obtained.
Its structure is simple and can be easily manufactured. If this photosensitive resin plate material is used in conjunction with the film for simple copy masters invented by the present inventor (Japanese Patent Application No. 192553/1983, pending), a desired negative film can be instantly produced. Even an amateur can obtain a corresponding plate very easily and inexpensively.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a sectional view of FIG. 1, and FIGS. 3 to 9 are schematic illustrations of the plate-making process. 1 is a container, 2 and 3 are container walls, 4 is a photosensitive resin,
5 is a photosensitive resin plate material, and 6 is a welded edge.

Claims (1)

[Scope of Claims] 1. A container comprising opposing walls formed of a transparent and flexible film, and a photosensitive resin filled and sealed in a predetermined amount necessary for plate making in the container,
One of the vessel walls is made of polyolefin and is releasable to the photosensitive resin after exposure, and the other vessel wall is made of chlorinated or chlorosulfonated polyethylene or polypropylene and is sensitive to light after exposure. The photosensitive resin is a mixture of a water-soluble prepolymer having an acroyl group or a meta-acroyl group, a water-insoluble prepolymer or a water-insoluble monomer, or a water-insoluble prepolymer and a monomer. A photosensitive resin plate material for plate making, which is composed of a composition containing a photosensitizer and a photosensitizer, and after exposure, the non-exposed areas dissolve in water and the interface with the exposed areas becomes white. 2. The photosensitive resin plate material for plate making according to claim 1, wherein the photosensitive resin further contains a water-soluble monomer.