JP2919894B2 - Photosensitive film for screen plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Field of the Invention The present invention relates to a photosensitive film for a screen plate. The present invention relates to a photosensitive film that can provide

b. Prior Art Conventionally, a screen plate has been made by applying a photosensitive film to a screen, then adhering a photomask, irradiating active rays such as ultraviolet rays, and then performing processing such as development and drying.

As a method of applying a photosensitive film to a screen, a method of directly applying a screen emulsion (hereinafter, referred to as an emulsion) to a screen or a method of applying an emulsion to a support such as a plastic film in advance and drying the emulsion is used. There is a method of transferring a conductive film to a screen.

In the former method of directly coating the emulsion, a required film thickness is obtained by repeatedly coating the emulsion on a screen using a bucket squeegee. Therefore, it takes time to form a photosensitive film per plate, and the larger the plate, the thicker the central part of the plate becomes.
There is a disadvantage that the film thickness accuracy is not accurately obtained.

Accordingly, today, the latter method of using a photosensitive film, which is easy to handle and can obtain a high-precision screen plate, is gradually increasing.

However, the photosensitive film obtained by the latter method is easy to handle and is a preferable material for obtaining a high-precision plate, but when transferring the photosensitive film to a screen, wrinkles are likely to occur when the support is peeled off. However, accidents due to the wrinkles are likely to occur.

In addition, both of them, for example, at the time of plate making, for example, moisture in the atmosphere,
The image quality of the screen plate is deteriorated or deteriorated by oxygen, dust, or the like, and it is difficult to obtain a high-precision plate finally. That is, the moisture in the atmosphere is gradually absorbed into the photosensitive film, causing a variation in sensitivity. In addition, oxygen in the air causes a decrease in sensitivity, and dust in the air has a drawback such as disconnection of a pattern or pinhole when it adheres to a photosensitive film.

The present inventors have proposed, in Japanese Patent Application No. 56-160649, a photosensitive film for a screen plate capable of preventing the above-mentioned adverse effects upon plate making in the atmosphere. However, there has been no solution to the prevention of dust that has already adhered to the photosensitive film itself during the transfer of the photosensitive film to the screen.

This occurs during the handling of the film before the transfer, the dust attached to the film side is not a problem,
Dust adhered to the photosensitive film side is a little sticky because the film surface is slightly sticky. State. If the dust part touches the printed circuit pattern, it may cause disconnection.

In order to solve such problems, Japanese Patent Publication No. 45-25231
Japanese Patent Application Publication No. JP-A-2003-115125 discloses a technique for preventing the adhesion of dust by using a dry film in which a photosensitive film is sandwiched between transparent films so that the cover film can be transferred while the photosensitive film is being transferred. However, in the case of a water-containing photosensitive film, when sandwiched by a cover film, there is a problem that the cover film floats during storage or that the moisture in the photosensitive film causes deterioration of the photosensitive film.

c. Problems to be solved by the invention The present invention has been made to solve the problems of the conventional technology. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the adverse effects of plate making in the atmosphere, that is, deterioration and deterioration of the image quality of a screen plate due to moisture, oxygen, dust and the like in the atmosphere, to facilitate handling and to have excellent storage stability. An object of the present invention is to provide a photosensitive film for a screen plate.

d. Means for Solving the Problems The present invention is characterized in that a screen emulsion is coated on a support, a photosensitive film is formed by drying, and a hygroscopic material is laminated on the photosensitive film. And a photosensitive film for a screen plate.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 1, the photosensitive film 1 for a screen plate of the present invention is obtained by sequentially laminating a photosensitive film 3 and a hygroscopic material 4 on a support 2.

The photosensitive film 3 is formed by applying a screen emulsion on the support 2 and drying it.

As the screen emulsion, among the conventionally used emulsions for screen printing, those containing water are particularly preferable. For example, a diazo emulsion, an acrylic emulsion, and an emulsion using another photosensitive resin are used.

Examples of diazo emulsions include emulsions of vinyl acetate and polyvinyl alcohol and emulsions of diazo resins, and commercially available products include Encosol and Azochol.

Examples of the acrylic emulsion include an emulsion mainly composed of a photopolymerizable photosensitive composition comprising partially saponified polyvinyl acetate, an ethylenically unsaturated compound, and a photopolymerization initiator.

Examples of other emulsions using a photosensitive resin include a photosensitive resin containing a stilbazolium derivative and a photosensitive resin composed of acrylamide and water-soluble nylon.

These emulsions can be used in the form of a mixture of other components, if necessary. Particularly, by using a screen emulsion containing an ethylenically unsaturated compound or an oily component such as a plasticizer, the effects of the present invention can be further exhibited.

The photosensitive film 3 is formed by coating the above-mentioned screen emulsion on a support using, for example, a reverse coater, a gravure coater, a doctor bleed coater, a bar coater, an air knife coater, and an extruder, and drying. be able to. The film thickness of the photosensitive film 3 is in the range of 10 to 500 μm, preferably 20 to 100 μm in a dry state, and it may be coated several times or may be a mixture of several kinds of emulsions. .

As the support 2, for example, paper, release paper, synthetic paper, or plastic film can be used. As the plastic film, for example, a film of polyester, polyethylene, polycarbonate, polyvinyl chloride, or the like can be used. The film may be transparent or opaque, and may be colored, coated with a water-soluble resin, or subjected to a mat-like treatment. Can also be used. The thickness of the support is 20-500μ, preferably 50-125μ.

As the material 4 having hygroscopicity, paper or a sheet-like material having properties similar to paper can be used.
Further, a material such as dust-free paper that can minimize generation of dust is preferable. The thickness is 10-500μ, preferably 50-150μ
It is.

The lamination of the photosensitive film 3 and the hygroscopic material 4 is preferably performed immediately after the coating and drying of the photosensitive film, but may be performed after the photosensitive film is cut.

The photosensitive film for a screen plate of the present invention is transferred to a screen plate as shown in FIGS. 2 (a) to 2 (d).

That is, the screen 6 is spread on the frame 5 and the transfer roller
The photosensitive film 3 is brought into contact with the screen 6 while peeling off the hygroscopic material 4 by 7a, 7b or by hand. At this time, the emulsion 9 contained in the bucket 8 provided on the back side of the screen 6 is pressed against the back side of the screen 6 so that the photosensitive film 3 and the screen 6 are combined.
And dried (Fig. 2 (a)-
(B)). After peeling off the support 2, a photomask 10 is adhered to the photosensitive film 3 (FIG. 2 (c)). Then, the plate is irradiated with an actinic ray and then developed to obtain a screen plate.

e. Function As a method of bonding (attaching) the photosensitive film to the screen, in addition to the method of bonding while contacting the emulsion as described above, for example, spraying water or water containing a solvent on the screen to wet the screen. There is also a method in which a photosensitive film of a photosensitive film is brought into contact with and adhered thereto.

When a conventional photosensitive film is stored for a long period of time, blocking may occur between the back side of the support and the photosensitive film. In addition, there is a problem unfavorable in work such as attachment of dust during handling.

Furthermore, when laminated and stored like a plastic film without moisture absorption on the photosensitive film,
There are problems such as the film floating during storage and the moisture in the photosensitive film not being removed, and the moisture adversely affecting the sensitivity and developability of the photosensitive film.

However, in the photosensitive film for a screen plate of the present invention, since a hygroscopic material is laminated on the photosensitive film,
Even when stored in a roll or sheet, the hygroscopic material absorbs moisture in the photosensitive film and prevents the photosensitive film from deteriorating due to the moisture. In addition, there is an advantage that the photosensitive film is not adversely affected by dust or moisture in the air from the structural point of view, and dust is not attached even when transferring the photosensitive film at the time of plate making.

f. Examples Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 A 20% by weight aqueous solution of partially saponified polyvinyl acetate (for example, Gohsenol GH-17; manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was applied onto Lumirror 100 (a polyester film manufactured by Toray Industries, Inc.) and dried (film thickness: 5 μm). ) To produce a support. Then, an acrylic screen emulsion (eg, polyvinyl alcohol, ethylenically unsaturated compound,
An aqueous solution containing methylcellosolve containing a photopolymerization initiator and a thermal polymerization inhibitor as main components) was applied and dried to form a photosensitive film 20μ having a thickness of 20μ. A 64 μm thick dust-free paper (Stacrine Blue; manufactured by Shikoku Paper) was superposed on the surface of the photosensitive film to prepare a photosensitive film for a screen plate.

The 50 products thus obtained were stacked and stored at room temperature for one month.However, since the backside of the support and the photosensitive film were separated by dust-free paper, there was no problem when using it as a photosensitive film for screen plates. Did not occur.

For comparison, a completely identical product was prepared except that no dust-free paper was sandwiched, and stored under the same conditions. As a result, the backside of the support and the photosensitive film were blocked and could not be used as a photosensitive film.

Example 2 Melinex 542 film (manufactured by ICI) 75 as a support
Using μ, an emulsion having the following composition was applied thereon by a wire bar so as to have a dry film thickness of 25 μ.

Polyvinyl acetate emulsion (solid content 50% by weight) 100g Partial saponified polyvinyl acetate (polymerization degree 2000: 500 = 9: 1) 17% by weight aqueous solution 200g Trimethylolpropane triacrylate 5.4g Urethane acrylate 18.9g 2- Hydroxypropyl acrylate 2.7g Irgacure 184 1.5g Benzophenone 1.5g 10% by weight aqueous dispersion of phthalocyanine green 2g 4-Diazodiphenylamine sulfate paraformaldehyde condensate (diazo resin) 2g Water 40g Photosensitive film of a film coated with the above emulsion The dust-free paper used in Example 1 was overlaid on the surface to produce a photosensitive film for a screen plate.

After storage at room temperature for one year, the photosensitive film was taken out and laminated on a 250-mesh Tetron screen using an emulsion having the same composition as that described above as a laminating emulsion to prepare a screen photosensitive plate. A positive film for a printed circuit board is vacuum adhered to the screen plate, irradiated with ultraviolet light for 40 seconds using a 3KW-ultrahigh pressure mercury lamp (distance: 70 cm), then immersed in water for 2 minutes, and then sprayed. A screen printing plate was obtained.

This screen printing plate had almost the same reproducibility as the screen printing plate using the film immediately after production.

Example 3 A stilbarium-based photosensitive emulsion was coated on a support prepared in the same manner as in Example 1 using a reverse coat.
By forming a photosensitive film having a thickness of μ, a photosensitive film for a screen plate was obtained. Even when the same conditioned dust-free paper as in Example 1 was overlaid thereon and stored at 40 ° C. for 2 weeks, no quality problem occurred. Those in which no dust-free paper was sandwiched blocked in the same manner as in Example 1, and craters occurred on the photosensitive film.

Example 4 On the support used in Example 2, an emulsion having the following composition was prepared.
After coating with a wire bar so as to have a dry film thickness of 100 μm and forming a photosensitive film, the dust-free paper used in Example 1 was overlaid to obtain a photosensitive film for a screen plate. For comparison, the same screen plate film was prepared except that no dust-free paper was used.

Polyvinyl acetate emulsion (solid content 50% by weight) 700g Partial saponified polyvinyl acetate (polymerization degree 2000: 500 = 9: 1) 17% by weight aqueous solution 300g Benzyl alcohol 10g 10% by weight phthalocyanine blue aqueous solution 2g 3-methoxy Mesitylene sulfonate of a condensate of -4-diazodiphenylamine and 4,4-dimethoxymethyldiphenyl ether 3 g water 10 g ethanol 10 g One year later, as a thick film for dyeing, laminating with 80 mesh tetron screen using water After irradiating with ultraviolet rays for 25 minutes using the same light source as in Example 2, the same treatment as in Example 2 was performed to obtain a screen plate.

Those stored without dust-free paper were already blocked, the adhesion between the photosensitive film surface and the back surface of the support was strong, and the photosensitive film surface was easily peeled off from the support, and could not be used.

g. Effects of the Invention According to the photosensitive film for a screen plate of the present invention, adverse effects when making a plate in the air, that is, deterioration and deterioration of image quality of the screen plate due to moisture, oxygen, dust and the like in the air are eliminated, An easy-to-handle and high-precision screen plate can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a screen-plate photosensitive film according to the present invention, and FIGS. 2 (a) to 2 (d) are process diagrams of using the screen-plate photosensitive film according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Photosensitive film for screen plates, 2 ... Support, 3 ...
Photosensitive film, 4 ... A material having hygroscopicity.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-139720 (JP, A) JP-A-2-1865 (JP, A) JP-A-1-105238 (JP, A) JP-A-62 111250 (JP, A) JP-A-2-4787 (JP, A) JP-A-2-3686 (JP, A) JP-A-2-1714 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) G03F 7 / 12,7 / 004

Claims (2)

(57) [Claims] 1. A water-containing photosensitive film is formed by coating a screen emulsion on a support and drying the emulsion, and a hygroscopic and water-insoluble material is laminated on the photosensitive film. Characteristic photosensitive film for screen plate. 2. The photosensitive film for a screen plate according to claim 1, wherein the material having a water-absorbing property and having no water solubility is paper or a material having properties similar thereto.