JPH08211617A - Wash-off type photosensitive film - Google Patents

Abstract

PURPOSE: To suppress scattering of active rays caused by a mat layer when an image is formed by exposure and to obtain a duplicated figure having sharp picture lines by forming a UV-absorbing resin layer on the opposite side to a photosensitive layer. CONSTITUTION: A UV-absorbing resin layer is formed on the opposite side of a transparent plastic film to the side where a photosensitive layer is formed. The resin layer suppresses the scattering of active rays and consists of a resin containing a UV absorbent. As for the resin to constitute the matrix, for example, polyvinylpyrrolidone, polyvinyl alcohol, poly(N-hydroxyethylacrylamide) or vinylpyrrolidone-vinyl acetate copolymer is used. As for the UV absorbent, for example, benzophenone is used. The UV-absorbing resin layer is controlled to have about 0.01-0.5 absorption density of UV rays. The thickness of the coating film is usually controlled to 0.1-10g/m<2> coating amt. to obtain the density range depending on the kind of the UV absorbent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wash-off type photosensitive material suitable for preparing a duplicate drawing which requires writing with a writing instrument, such as a white map or a tracing film for drafting based on a transparent plastic film. And a method for forming a duplicate drawing using the same.

[0002]

2. Description of the Related Art The surface of a plastic film can be written with a pencil or a ballpoint pen by physically roughening the surface by sandblasting or by providing a chemical mat layer consisting of fine particles and a binder. It is necessary to form a roughened layer. A film having such a surface-roughened layer, that is, a matte film is widely used as a tracing film for drawing and a base film of a photosensitive film.

By the way, when this matte film is used as a base film of a photosensitive film, especially a wash-off type photosensitive film, the image support is brought into contact with the photosensitive layer or the surface opposite to the photosensitive layer, The actinic ray is irradiated through the image support to perform image forming exposure.
At this time, since the actinic rays are scattered by the matte layer, there is a drawback that the image lines become thin, thick, or broken, and the image lines become unclear.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a photosensitive film having a transparent plastic film having a mat layer on one side or both sides as a base film, which suppresses the scattering of actinic rays due to the mat layer and produces a clear image. This is done to form a duplicate drawing having a drawing line.

[0005]

The inventors of the present invention have conducted various studies on a wash-off type photosensitive film having a transparent plastic film having a mat layer as a base film, and as a result, By providing an ultraviolet absorbing resin layer on the surface opposite to the surface provided, it was found that the scattering of actinic rays due to the matte layer during imagewise exposure can be suppressed, and the present invention based on this finding. Came to make.

That is, according to the present invention, in a film having a photosensitive layer provided on one surface of a transparent plastic film having one or both surfaces roughened, an ultraviolet absorbing resin layer is provided on the surface opposite to the photosensitive layer. The present invention provides a wash-off type photosensitive film.

Here, the wash-off type photosensitive film is a type of photosensitive film in which an irradiated portion is insolubilized or solubilized by irradiation with active light, and a soluble image is dissolved and removed by a solvent to form a relief image. Means a sex film.

The transparent plastic film used as the substrate in the present invention can be arbitrarily selected from those usually used in the photosensitive film so far. As such, for example, polyester,
Examples include transparent plastic films such as polyamide, polypropylene, polyethylene, polystyrene, polyvinyl chloride, polyacetate, and acrylic resin. Suitably, these films have a thickness of 10 to 250 μm.

When used in the present invention, these transparent plastic films are required to have one or both surfaces roughened. This roughening can be performed by using a commonly used method such as a sandblast method, an alkali etching method, an embossing method, a chemical mat method. This roughening may be performed on only one side of the transparent plastic film or on both sides.

Next, it is necessary to provide a photosensitive layer on one surface of the transparent plastic film having one surface or both surfaces roughened in this manner. This photosensitive layer can be alkali-developed after imagewise exposure. Those composed of such a photosensitive resin composition are preferable. Examples of such a photosensitive resin composition include those containing a combination of an o-naphthoquinonediazide derivative as a photosensitive component and an alkali-soluble novolac resin as a resin component. Examples of this o-naphthoquinonediazide derivative include an ester of a benzophenone compound having a hydroxyl group and 1,2-naphthoquinonediazide-4 (or 5) -sulfonic acid, and an alkali-soluble phenol novolac resin as a resin component, Examples include alkali-soluble cresol novolac resins, polyvinylpyrrolidone homopolymers, copolymers of vinylpyrrolidone and vinyl acetate, and copolymers of vinylpyrrolidone and dimethylaminoethyl methacrylate.

Further, a combination of the above-mentioned photosensitive component and resin component, for example, 1,2-naphthoquinonediazide-4.
It is also possible to use an ester obtained from (or 5) -sulfonic acid chloride and m-cresol novolac resin or a corresponding amide. These are all known substances, for example, JP-B-37-13109, JP-B-38-12083, JP-B-45-5604, JP-B-51-13013, and JP-A-47-5.
No. 303, JP-A-48-63802, JP-A-49-38701 and the like. These may be used alone or in combination of two or more.

If desired, the photosensitive resin composition used for forming the photosensitive layer in the present invention may contain additives commonly used in this type of photosensitive resin composition. Such components include palmitic acid, stearic acid, organic acids such as oxalic acid, inorganic acids such as phosphoric acid, phthalic anhydride, acid anhydrides such as tetrahydrophthalic anhydride, sensitizers, heat stabilizers, There are antioxidants, etc.

This photosensitive resin composition is usually dissolved in a suitable solvent such as alcohols, ketones, halogenated hydrocarbons, ethers, etc. and applied to one surface of the roughened transparent plastic film. Then, the photosensitive layer is formed by drying. When the photosensitive layer is provided on the transparent plastic film having one surface roughened, it may be provided on the roughened surface or on the surface not roughened.

Next, the ultraviolet absorbing resin layer provided on the surface of the transparent plastic film opposite to the surface provided with the photosensitive layer suppresses the scattering of actinic rays, and preferably contains an ultraviolet absorber. Formed by the resin layer. As the resin constituting this matrix, it is advantageous to use a water-soluble resin so as to be removed during development. Examples of such a resin include polyvinylpyrrolidone, polyvinyl alcohol, poly (N-hydroxyethylacrylamide), and a copolymer of vinylpyrrolidone and vinyl acetate.

As the UV absorber contained in this matrix, UV absorbers usually used for plastics, for example, benzophenone-based, salicylate-based, benzotriazole-based, acrylonitrile-based UV absorbers can be used, but they are light-colored. It is preferable to use a series of dyes. Examples of such dyes include yellow dyes among anthraquinone dyes, indigoid dyes, and azo dyes.

The ultraviolet absorbing resin layer is adjusted so that the ultraviolet absorbing concentration is in the range of 0.01 to 0.5.
If the optical density is lower than this, scattering by the matte layer during exposure cannot be sufficiently suppressed, and if it is higher than this, it takes a long time for exposure and is not practical.
The coating thickness for achieving such an optical density depends on the type of the ultraviolet absorber, but usually the coating amount is 0.1-0.1%.
It is desirable to set it within the range of 10 g / m ² .

The wash-off type photosensitive film of the present invention has a wide exposure range in which the exposure latitude, that is, the image line is not cut, thinned or thickened and the image resolution is proper, and therefore the ultraviolet absorbing resin layer is made of transparent plastic. It is particularly advantageous in the case where the film is provided on the roughened surface of the film and the ultraviolet ray absorbing resin layer surface is brought into close contact with the image support to irradiate active rays through the image support, that is, in the case of so-called back baking.

[0018]

EXAMPLES The present invention will be described in more detail with reference to examples. The physical properties described in the examples are obtained as follows.

(1) Ultraviolet absorption density of back coat layer: Macbeth densitometer TD904 (Kodak Ratten filter No. 18A) was used. (2) Exposure latitude: A 1/5000 scale map as a positive document was brought into close contact with a photosensitive film used as a sample, and exposure was performed by irradiating ultraviolet rays from a distance of 1 m using a 3 KW mercury lamp. Next, this exposed film was dipped in a 2% sodium metasilicate aqueous solution (35 ° C.), and then the direct fast black D (C.
I. 27700) for 1 minute to dye, wash with water,
Dried.

In this way, the map image is thinned, cut,
It is expressed by the difference between the maximum exposure amount (mJ) and the minimum exposure amount (mJ) per unit (cm ² ) that does not cause the image to be fat and the image resolution is appropriate. This exposure latitude indicates the allowable range of exposure for obtaining a faithful copy, and a wider one is preferable.

Optimal exposure dose: The minimum exposure dose obtained in the exposure latitude, and if it is large, the working time will be long, so it is preferable that it be small, but if it is too small, the workable time in the bright room will be too short. Thus causing a problem in practical use.

Example 1 Mixture 1 of polyvinylpyrrolidone powder having a molecular weight of 630,000 and polyvinylpyrrolidone powder having a molecular weight of 40,000 in a weight ratio of 1: 3
0 part by weight was added to 90 parts by weight of a mixed solvent of ethanol and methyl ethyl ketone (weight ratio 1: 1) to uniformly dissolve the same. Next, 3 parts by weight of a reaction product of 1,2-naphthoquinonediazide- (2) -4-sulfonic acid chloride and m-cresol novolac resin was added to this mixture, and the mixture was stirred to prepare a photosensitive composition.

Then, the above-mentioned photosensitive composition is roll-coated on the non-roughened surface of a polyethylene terephthalate film having a thickness of 75 μm, which is roughened by sandblasting on one side, and dried with hot air at 80 ° C. for 1 minute. Due to thickness 2 μm
To form a photosensitive layer.

Separately, 20 parts by weight of the same polyvinylpyrrolidone powder mixture described above was added to 360 parts by weight of water,
Stir to dissolve. Next, an ultraviolet absorbing yellow dye (Kayacyl Ye, manufactured by Nippon Kayaku Co., Ltd.) was added to this mixture.
(low GG) was added at a ratio shown in Table 1 and stirred to dissolve. The coating solution thus obtained is roll-coated on the surface of the film opposite to the photosensitive layer, that is, on the roughened surface, and then dried with hot air at 100 ° C. for 1 minute to absorb an ultraviolet ray having a coating amount of 1 g / m ² . A resinous layer was formed.

[0025]

[Table 1]

Table 2 shows various physical properties of the wash-off type photosensitive film thus obtained, which was reproduced by using a positive original having a scale map of 1/5000. In the table, front baking is the case where the image support and the photosensitive layer surface are brought into close contact with each other for exposure, and back baking is the case where the image support and the ultraviolet absorbing resin layer surface are brought into close contact with the exposure. . The dye addition rate is represented by the weight ratio of the dye to polyvinylpyrrolidone.

[0027]

[Table 2]

As can be seen from this table, the photosensitive film of the present invention has a slightly larger optimum exposure amount than the conventional film (Comparative Example 1), but the exposure latitude is large, and therefore the working time is within an allowable range. Because of the large size, uniform copying can be obtained without requiring strict working conditions. Also, if the optical density of the ultraviolet absorbing resin layer is made too large, the exposure latitude becomes large, but the optimum exposure amount significantly increases, the working time becomes long, and the pH of the developing solution changes due to the elution of the dye, The life cycle of the liquid becomes short, and the eluted dye redeposits on the film.

[0029]

EFFECTS OF THE INVENTION Since scattering of actinic rays irradiated is suppressed during image forming exposure, thinning, thickening or breakage of image lines is unlikely to occur, and it is particularly suitable for use when copying a map for writing. it can.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaya Numaike 4-1-2-1, Ginza, Chuo-ku, Tokyo Somer Co., Ltd.

Claims (3)

[Claims] 1. A film in which a photosensitive layer is provided on one surface of a transparent plastic film having one surface or both surfaces roughened, and an ultraviolet absorbing resin layer is provided on the surface opposite to the photosensitive layer. Wash-off type photosensitive film. 2. The wash-off type photosensitive film according to claim 1, wherein the ultraviolet absorbing resin layer is provided on the roughened surface of the transparent plastic film. 3. A wash-off type photosensitive film in which an ultraviolet absorbing resin layer is provided on one roughened surface of a transparent plastic film having one or both surfaces roughened, and a photosensitive layer is provided on the other surface. And forming a duplicate drawing characterized in that the ultraviolet absorbing resin layer surface and the image support are brought into close contact with each other to perform image formation exposure, and then development processing is performed to form a pattern and at the same time, the ultraviolet absorbing resin layer is removed. Method.