JPS6043653A - Peelable diazo type photosensitive film - Google Patents

Abstract

PURPOSE:To leave a corrected heated part on a film and to render an initial exposed image easily peelable from the film by forming a peelable coat contg. a diazo type photosensitive dye on one side of a transparent platic film, and forming a matted layer on the other side. CONSTITUTION:A peelable diazo photosensitive coat contg. a diazo type photosensitive dye and a vinyl chloride-vinyl acetate copolymer or the like as a binder is formed on one side of a transparent plastic base made of polyester or the like. A matted layer contg. a powder, such as silica or TiO2 powder, having an average particle diameter of 0.1-50mum is formed on the other side of the base opposite to the photosensitive coat to form a photosensitive film. Writing and correction with a pencil, ink, or the like is easy, and a sharp printed image is obtained. An intermediate original is corrected by using it, only the corrected part is left on the plastic film, and the diazo photosensitive image part is peeled, thus facilitating the separation of plates.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diazo type photosensitive film whose diazo photosensitive surface has releasability and whose back surface exhibits excellent writability with pencils and the like, as well as excellent transparency. .

Conventionally, many diazo type second original drawings have been put to practical use in the fields of civil engineering surveying and architectural design.

The second original drawing described above is necessarily required to have the following functions due to its use. In other words, - Excellent writing and drawing properties with pencils, water-based inks, etc. ■The printed image must be clear and not discolored during long-term storage.

■Clear printing requires sufficient transparency and a smooth surface to obtain an image. etc.

However, most of the diazo type second originals currently on the market have writing characteristics and other characteristics by blending matting agents such as silica, alumina, and plastic powder with photosensitizers.

Furthermore, in the conventional second original of the diazo type, a coating material with good adhesive properties is used to form the photosensitive layer so that the base and the photosensitive layer have good adhesion and do not peel off.

However, although such conventional second original drawings have the advantage of allowing additions to be made after image formation, it has been impossible to separate only the added portions when performing plate separation.

The present inventor discovered that after making additions to the second original drawing, separation can be easily performed by leaving only the added portion on the plastic film of the second original drawing and physically peeling off the diazo-sensitive image portion from the plastic film. As a result, the present invention was completed.

That is, the present invention provides a peelable diazo type photosensitive film which is formed by providing a peelable photosensitive coating layer containing a diazo type photosensitive dye on one side of a transparent plastic film base and forming a matte layer on the other side. be.

The transparent plastic film base used in the present invention includes polyester films such as polyethylene terephthalate and polyethylene natsuta, polyester films, polycarbonate films, cellulose acetate films, polypropylene films, and the like.

Next, a peelable photosensitive coating layer containing a diazo photosensitive dye is provided on one side of the film, and the diazo photosensitive dye may be any conventionally known one.

Specifically, for example, 4-morpholino-2,5-dibutoxybenzenediazonium-ZnCI2.4-morpholino-2,5-diethoxybenzenediazonium%ZnC
l2 etc. are used. In addition, examples of coating film forming components of the diazo photosensitive dye include vinyl chloride-vinyl acetate copolymer, vinyl chloride resin, vinylidene chloride resin, acrylic resin, styrene resin, vinyl acetate resin, and vinylidene chloride-acrylonitrile copolymer. resin is used.

The resin is used by being dissolved or dispersed in one or more organic solvents such as methyl ethyl ketone, methyl imbutyl ketone, cyclohexanone, penzole, doluol, quidylol, methanol, ethanol, and isopropanol. Further, a dispersant, a surfactant, a matting agent, etc. may be added to the coating film forming agent as required.

In the present invention, the photosensitive film forming agent described above is applied to one side of the transparent plastic film, and a matte layer is formed on the other side. However, in order to form the above-mentioned cloak layer, the matting agent is dispersed in the binding resin. This is done by applying a coating material to a plastic film.

The mantle agent used in the present invention includes glass powder, silica powder, clay powder, titanium oxide, shavings powder, fused alumina fine powder, etc., and the average particle size is 0.1 to 50/! Although those with a diameter of 1 to 10 μm are particularly preferred.

Further, as the binding resin, methylcellulose, hydroxyethylcellulose, sodium carboxymethylcellulose, maleic acid-vinylpyrrolidone copolymer resin, polystyrene resin, maleic M 4HJll'? , xylene resin, phenol resin, acrylic resin, polyurethane resin, alkyd resin, etc.

In producing the peelable diazo-type photosensitive film of the present invention, the necessary amount of the desired diazo-sensitive dye is blended with the coating film forming agent as described above, and this is applied to one side of a transparent plastic film, and then the other side is coated. This is done by applying a coating material in which the above-mentioned mantle agent is dispersed in a binding resin onto the clear surface.

The peelable diazo type photosensitive film of the present invention is satisfactory because the diazo photosensitive surface has peelability by physical peeling means such as a cutter, and the back side of the diazo photosensitive surface is provided with a matte layer. It is easy to write on and its transparency is extremely good.

Therefore, when the peelable diazo type photosensitive film of the present invention is used to create a map, etc., the modified portions remain on the base film, and the underlying photosensitive image can be peeled off from the base film and removed. It has excellent properties that allow for easy creation of separations without disturbing the underlying photosensitive image.

Hereinafter, the present invention will be specifically explained with reference to Examples.

(Example) A diazo photosensitive solution with the following formulation was applied to one side of a 75 μm polyester base film and dried to form a photosensitive state I with peelability! A jiI layer is provided.

Vinyl chloride-vinyl acetate copolymer 8 parts by weight Vinylidene chloride resin 12 parts by weight Methyl methacrylate resin 5 parts by weight Sulfosalicylic acid 10 M parts Zinc chloride 2 parts by weight m-oxyethylphenol 10 parts by weight Resorcinol
1 part by weight 3-sulfonic acid-1-oxynaphthalene-8-sulfonic acid methylamide 2M parts Double salt of 4-morpholinobenzenediazonium zinc chloride 7 parts by weight Methyl cellosolve 400 parts by weight Methyl ethyl ketone 440 parts by weight Ethanol 100 parts by weight Finely divided silicic acid 5 parts by weight of fine powder (trade name: Thyroid 978 manufactured by Fuji Davison) Next, 5 parts by weight of fine powder silicic acid, 80 parts by weight of rosin-modified maleic acid resin, and vinyl acetate-vinyl pyrrolidone copolymer resin were added to the back side of the polyester base film. 20 parts by weight, 25 parts by weight of xylene, 2 parts by weight of isopropyl alcohol
A mantle agent coating solution containing 0.00 parts by weight was applied using a gravure roll coater so that the coating weight after drying was 1.7 g/m to obtain a peelable & 11-resistant diazo type photosensitive film. The photosensitive film was combined with the diazo photosensitive layer and the original, and after exposure to a fluorescent lamp, an ammonia original image was obtained to obtain a second original image. The back side of this second original drawing (namely, the cloak stone) had excellent ease of addition and erasing with an eraser, and had good translucency. The adhesive strength of the photosensitive surface of this second original was 40 g/2 mm, and it could be easily peeled off from the polyester base film using a cutter knife or the like.

patent applicant

Claims (1)

[Claims] A peelable diazo type photosensitive film comprising a transparent plastic film base, a peelable p-photosensitive coating layer containing a diazo photosensitive dye on one side, and a cloak layer on the other side.