JPS6141148A - Photosensitive resin holder for plate making - Google Patents

Abstract

PURPOSE:To obtain a photosensitive resin holder capable of easily forming a printing plate by filling the photosensitive resin in a flat vessel composed of a transparent flexible film having a face releasable from the photosensitive resin after exposure as the wall of the vessel on one side, and another transparent flexible film having an adhesive face as the other vessel wall and sealing the vessel. CONSTITUTION:One side inner wall of the vessel 1 for filling the photosensitive resin 4 is formed with a transparent flexible film 2 of a resin, such as chlorinated PE or chlorosulfonated PP, having a face releasable from the resin 4 after exposure, and the opposite inner wall is formed with a transparent flexible film 3 of PE or the like having a face adhesive to the exposed resin 4, then, the circumferential part 6 is melt fixed except the inlet of the resin 4, the resin 4 in a liquid state is injected, and the inlet is sealed to obtain the holder 5 of the resin 4. The holder 5 is brought into contact with a negative film 12 on the side of the wall 2, and they are sandwiched between two glass plates 11, 13, exposed to the light incident from the plate 13 side for 10-13sec exposed to light incident from the plate 11 side for about 180sec, the resin 4 layer is cut off together with the film 3, and the unexposed part is washed off with a stream of water, thus permitting a printing plate 7 having a pattern 8 good in precision, and having superior printing resistance to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photosensitive resin holder for plate making, which allows plates such as printing plates and stamps to be easily produced.

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 drawing 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 the film with a transparent glass plate, 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, and after drying, print on the page. The desired resin plate is obtained by post-exposure.

However, in the above operation, air bubbles may be introduced into the photosensitive resin, the amount of resin injected may be insufficient, or the resin may be injected into the frame and transparent films must be inserted on both the top and bottom surfaces of the frame, which is a cumbersome operation. 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 need to worry about air bubbles entering the resin or injection amount being too much or too little. It is easy to make plates without requiring any skill 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) in contact with an image such as a negative film, and an outer surface in contact with the image has a removability. The container wall (8 ) 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 (8) does not adhere to the photosensitive resin, it will tend to 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) mentioned above includes polyolefins such as polyethylene, polypropylene, and other films with the same effect, and the film constituting the container wall (3) includes:
For example, in addition to chlorinated polyethylene, chlorinated polypropylene, chlorosulfonated polyethylene, chlorosulfonated polypropylene, etc., surface treatment by applying chlorinated or chlorosulfonated polyethylene or polypropylene to at least the contact surface with the photosensitive resin; synthetic resin film can be used. These two films are formed in the required amount according to the amount of resin to be accommodated, and the container (1) is formed by overlapping the two films and heat-sealing the edges, leaving an opening. A certain amount of photosensitive resin (4
) using a vacuum filling device, etc., so as not to contain air bubbles and leave no air space between the container wall and the resin.
The edges of the opening are sealed by welding or the like to obtain a photosensitive resin holder (5). (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 is emulsified and dissolved in water etc., 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 consists of a water-soluble prepolymer having at least seven acryloyl groups CH2=CHC0- or methacryloyl groups cH2=C(CH3)Co- at the terminal or side chain, and a water-insoluble polymer such as a vinyl ester type or acrylic type. The composition contains appropriate amounts of a photosensitizer and a water-insoluble substance selected from the water-insoluble prepolymer and/or the above-mentioned water-insoluble seven polymers. 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 washed out with condensate that has been exposed to light, the resin in the non-exposed 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 700 parts of water-soluble prepolymer (
(parts by weight, the same applies hereinafter) to 5~/! of the water-insoluble substance! o parts, photosensitizer 0.1 to 90 parts, preferably 700 parts of water-soluble prepolymer, water-insoluble substance o~/θθ parts, photosensitizer θ,j~3o parts.

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 seven types of water-soluble monomers are 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 formed.

The above water-soluble prepolymers having an acryloyl group or a methacryloyl group include polyethylene oxide, polyethylene glycol, sodium polyacrylate, polyacrylic acid, polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, carboxymethylcellulose, etc. Carboxyl group -COO of powder, polyacrylamide, polyvinylpyrrolidone, polyamine, water-soluble polyester, water-soluble polyepoxy, viscose, gelatin, collagen, etc.
H1 hydroxyl group-0H1 A water-soluble (pre)polymer having other functional groups has at least 7 acryloyl or methacryloyl groups at the terminal or side chain, and has the above carboxyl group, hydroxyl group or other functional group. A water-soluble polymer is used, a required amount of a compound having an acryloyl group or a methacryloyl group such as glycidyl acrylate, acrylic acid, glycidyl methacrylate, or methacrylic acid is added thereto, and a prescribed treatment is performed in the presence of a catalyst. Obtained by reacting under certain conditions.

Examples of the vinyl ester-based and acrylic-based water-insoluble prepolymers include polyester acrylate, epoxy acrylate, polyurethane acrylate, polyether acrylate, olico'acrylate, alkyd acrylate, polyol acrylate, and vinyl ester.

Examples of water-insoluble polymers include trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, tetramethylolmethane triacrylate, tetramethylolmethanetetraacrylate, tetraethylene glycol diacrylate, and trimethylolpropane trimethacrylate. Ethylene glycol diacrylate, polyethylene glycol diacrylate), /, O-hexanediol diacrylate, neopentyl glycol diacrylate, α, α′ bis(cuacryloxyjethoxyphenyl)propane, tripropylene glycol diacrylate, ethylene Glycol dimethacrylate, mono(2-acryloyloxyethyl) acid phosphate, mono(2-methacryloyloxyethyl) acid phosphate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, λ-ethylhexyl methacrylate,
Isobutyl methacrylate, stearyl methacrylate, lauryl methacrylate, cohydrooxypropyl methacrylate, -monohydroxyethyl acrylate,
Ethylcarpitol acrylate, methyl triglycol acrylate, butoxyethyl acrylate, tetrahydrofurfuryl acrylate.The following photosensitizers may be selected as appropriate to be added to the above water-soluble prepolymer and water-insoluble substance. It can be used as p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone,
2-diftquine-2-phenylacetophenone, /-hydroquinecyclohexylphenylketone, benzoin isobutyl ether, pentwinisopropyl ether,
p-tert-butyltrichloroacetophenone, p-
tert-butyl dichloroacetophenone, n-butyl or isobutyl benzoin ether, /-phenyl-/
, 2-propanedione-(0-ethoxycarbonyl)oxime, cochlorothioxanthone, comethylthioxanthone, dibenzosuberone, α,α-dichloro-
gouphenoxyacetophenone, ethyl anthraquinone, benzyl, benzoin ethyl ether, CTX,
RTX, MBP.

DMBI.

Example formulations 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 (level of white turbidity at the interface between exposed and non-exposed areas), stability of the obtained letterpress (the shape of the letterpress mold remaining after washing out the resin in the non-exposed areas and its retention), and workability ( The following table shows how difficult it is to wash out the resin in non-exposed areas with running water.

(Margins below) (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 (marked O), slightly white (Δ), and does not become white (X). It was shown in

(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, Δ if it is slightly deformed, and X if it is deformed. Ta.

(8) For workability, when the unexposed area resin was washed with running water, it was indicated by ○ if it was extremely easy to wash with water, △ if it took a little time, and X if it took a considerable amount of time.

As photosensitive resins other than those mentioned above, for example, liquid photosensitive resins commercially available under the trade name of APR resin 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 producing a plate, such as a letterpress, using the photosensitive resin sealed in this container will be described below. Place a glass plate of an appropriate size on the table, place the negative film 0 on the glass plate Qll so that it forms a normal image, and place the container wall (
2) against the negative film and place the photosensitive resin holder (5) against the negative film.
), and a glass plate Q3 is placed on top of this photosensitive resin holder so that the photosensitive resin (4) in the holder maintains a uniform thickness and is not unevenly distributed, and is spread uniformly. In this case, it is preferable to insert a spacer QΦ approximately corresponding to the thickness of the plate to be formed at the peripheral edge between the glass plate α3 and the glass plate α or at one of the opposing edges. Then, clamp and fix the glass plates on both sides of the upper and lower sides with the edges (lips, etc., as shown in Figure 3), and expose them using the exposure device αQ (see Figure 1).
. Hereinafter, as in the conventional method, exposure is first performed from the glass plate α3 side for a short time, and then from the glass plate α◇ side for a relatively long time.

The exposure time is 1.5 cm for the thickness of the resin layer, which is approximately /+m (the vertical and horizontal dimensions of the resin layer are approximately 3 cm x 7.j cm). <W
When using an exposure device with two moth-attracting lights, approximately 7θ to 73 seconds from the glass plate α3 side and approximately /♂ from the glass plate αη side.
In many cases, an exposure time of 0 seconds is sufficient. When the exposure is finished, remove the glass plates on both sides, pick up the holder (5), cut off its peripheral edge (6) (see Figure), peel off the container wall (2) from the resin surface, and remove the exposed photosensitive resin. The wall of the vessel being glued (
3) Grasp one end with your fingertips and, for example, in the case of a photosensitive resin with a formulation example displayed, pour tap water flowing out of the faucet onto the resin and wash away the unexposed part of the resin. The exposed and hardened resin part (8) remains as a convex surface, and when the interface Q sand becomes cloudy, water washing is stopped and the water is drained (Fig. 1).This cloudy interface is removed by hot air, etc. When dried, it becomes transparent. After drying, place the container wall (8) side down on, for example, a glass plate α9, put it on an exposure device (to), and then expose it to obtain the desired resin plate (7). (Chapter ♂ (Figure).

By using the photosensitive resin holder as described above, the plate-making operation can be easily performed without requiring much effort or skill, and a resin plate with an excellent finish can be obtained, and its structure is simple.
Easy to manufacture. This photosensitive resin holder and the film for simple copy original plate invented by the present inventor (Special Application Sho!♂-/9
2ta J No. 3, pending application), a desired negative film can be instantly produced, and even an amateur can obtain a plate corresponding to this negative film very easily and at low cost.

[Brief explanation of drawings]

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 3 are schematic illustrations of the plate-making process.

Claims (1)

[Claims] 1. Transparency and flexibility to form a vessel wall with a transparent and flexible film and an adhesive surface to the photosensitive resin after exposure. A photosensitive resin holder for plate making, in which a predetermined amount of photosensitive resin necessary for plate making is filled and sealed in a container made of a film. 2. The photosensitive resin holder for plate making according to claim 1, wherein the releasable surface is formed of polyolefin and the adhesive surface is formed of chlorinated or chlorosulfonated polyethylene or polypropylene. 3. The photosensitive resin contains a water-soluble prepolymer having an acroyl group or a meta-acroyl group, a water-insoluble prepolymer, a water-insoluble monomer, or a mixture of a water-insoluble prepolymer and a monomer, and a photosensitizer; The photosensitive resin holder for plate making according to claim 1, which is a composition containing or not containing a reactive monomer.