JPS59218893A - Heat sensitive screen stencil paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat-sensitive stencil plate in which a vinylidene chloride copolymer film and a porous thin paper or a mesh-like sheet are bonded together with an adhesive, and a silicone coating layer is provided on the surface of the vinylidene chloride copolymer film. It concerns the original paper.

Conventionally, a major drawback of heat-sensitive stencils is the problem of fusion between the film of the heat-sensitive stencil and the original during plate-making, and in particular, it is difficult to use PPC originals copied using toner containing epoxy resin, urethane-based resin, or polyester-based resin. When used, there was a tendency for fusion to occur, resulting in damage to not only the manuscript but also the plate.

In order to prevent this fusion, it is possible to provide a release layer on the surface of the film in contact with the document, for example, in Japanese Patent Publications No. 43-10093, Japanese Patent Publication No. 5139-1987, Japanese Patent Publication No. 48-100'9, Japanese Patent Publication No. 48-1531, No., Special Publication No. 4B-30570, etc.

These known techniques use various fine powders of inorganic and organic substances, sodium stearate, surfactants, and silicone as materials to prevent the film from adhering to the original, but materials other than silicone do not prevent adhesion. It is sufficient, and the perforation clarity is also poor. The silicone used for this purpose is a high temperature curing type (cured at 100° C. or higher) silicone resin or silicone oil.

When using high-temperature curing silicone resin to provide a release layer on a film, it is necessary to heat it to 100°C or higher to cure it, but since the film is very thin at around 10μ, fine wrinkles will occur due to heating. . These wrinkles extremely deteriorate the adhesion between the document and the film during plate making, reducing the clarity of the perforated image. Furthermore, when using silicone oil, since it is liquid at room temperature, there are drawbacks such as staining the manuscript during plate making, or creating stickiness when applying the release layer by hand, resulting in the silicone oil being transferred to the hands.

The present invention provides a heat-sensitive stencil paper which has improved the above-mentioned drawbacks.

That is, the present invention provides a heat-sensitive stencil paper in which a vinylidene chloride copolymer film and a porous thin paper or a mesh-like sheet are bonded together with an adhesive, and a silicone coating layer is provided on the surface, in which room-temperature curing silicone is used as the silicone. This is a heat-sensitive stencil paper that is characterized by the fact that it is used.

The vinylidene chloride copolymer film used in the present invention preferably has a thickness of 8 to 15 μm, and the porous thin paper includes natural fibers such as manila hemp, kozo, and mitsumata, and synthetic fibers such as polyester, vinylon, and acrylic. , basis weight 5-1, made mainly from semi-synthetic fibers such as rayon.
About 5 g/nt can be used. Furthermore, it is preferable that the mesh-like sheet 1 is woven from fibers of nylon, polyester, polypropylene, etc. having a thickness of 30 to 50 microns, and has a lattice spacing of 50 to 150 p.

Adhesives include vinyl acetate resin, acrylic resin,
Polyester resin can be used.

Next, the room-temperature-curing silicone used in the present invention includes all silicones in which the curing reaction proceeds without requiring heating above 100°C, such as (Toray Silicone S R2402 resin manufactured by Kiki Tore Silicone Co., Ltd., Toray Silicone 5R2410 resin, Toray silicone S R2
41 Luzin, etc.

The effect of preventing fusion is greatly influenced by the amount of silicone applied, and the effect increases as the amount of silicone applied increases. However, if the amount of coating is too large, the energy required for plate making will increase (and the clarity of the perforation image will also decrease significantly. Therefore, in order to obtain a practically satisfactory effect of preventing fusion, apply an appropriate amount. In the heat-sensitive stencil paper of the present invention, a dry weight of 0.02 to 2 g/n is suitable.

The heat-sensitive stencil paper of the present invention has the following features and advantages.

(2) Since no heat treatment is required to harden the silicone, the film does not undergo heat shrinkage and does not produce any wrinkles that would prevent reproduction of the original image.

2) Since it forms a hardened film, it does not migrate like silicone oil and does not contaminate anything that comes into contact with the silicone film layer.

3) Silicone has high mold releasability (and is extremely effective in preventing fusion, and is effective with a small amount of application, so the perforation image is sharp and has high resolution.

4> Silicone has a low surface tension and silicone paint spreads easily on the film surface, so it spreads over all parts and forms a thin film.

5) Since the silicone cured film is chemically inert,
It has long-term storage stability.

The present invention will be specifically explained below with reference to Examples.

Example 1 A saturated polyester resin (Vylon 300, manufactured by Toyobo Co., Ltd.) was dissolved in methyl ethyl ketone to prepare an adhesive solution with a solid content concentration of 10%.

Using this adhesive, a vinylidene chloride/hinyl chloride copolymer film (Furerap, Kureha Chemical Industry Co., Ltd.) with a thickness of llu and a porous thin paper with a thickness of 27 μm and a basis weight of 8.7 g/T& were bonded together to form a heat-sensitive stencil plate. A base paper was prepared. This is the standard product.

Next, a 1% methyl ethyl ketone solution of Toray Silicone SR2411 was applied as a release agent to the film surface of the standard product, dried at 40° C. for 15 minutes to form a release layer, and left at room temperature for 3 days. The coating amount of the release layer is O,1
g/n? Met.

Comparative Example 1 A 1% n-hexane solution of silicone oil was applied as a release agent to the surface of the standard film produced in Example 1, and dried at 40°C to form a release layer. Is the coating amount of the release layer 0.2g/n? There was.

Comparative Example 2 High temperature curing type Shin-Etsu Silicone KS707 was used as a release agent.
Catalyst PL-3 was added in 4 parts to 100 parts by weight, made into a 2% solution with rhohexane, and this solution was applied to the surface of the film of the standard product prepared in Example 1.
A release layer was formed by heating for 10 seconds at 130° C., which is the minimum heating temperature required for curing the IJ release agent. The coating amount of this release layer was 0.2 g/-. Under these curing conditions, fine wrinkles appeared in the heat-sensitive stencil paper due to heat shrinkage of the film. Wrinkles caused by heat shrinkage of the film during heat drying began to appear at around 50°C.

Example 2 Toray Silicone S R2402,100 as release agent
Add 4 parts by weight of catalyst 5RX242AC to parts by weight,
Make the solution 1% with n-hexane, apply this solution to the surface of the standard film prepared in Example 1, and dry at 40°C! IJ delamination was formed and left at room temperature for 3 days. The coating amount of the release layer was 1.5 g/IIF.

The heat-sensitive stencil sheets of Examples and Comparative Examples prepared as described above were plate-made using a plate-making machine (manufactured by Riso Kagaku Kogyo Co., Ltd., FX-150).

First, a copy is made on high-quality paper using a PPC copying machine (manufactured by Sharp Corporation, 5F740), this copy is brought into close contact with the surface of the heat-sensitive stencil paper film, and exposed to a gysenon flash from the thin paper surface at a light intensity of S-5, and the original is printed. A perforation corresponding to the image was formed, the manuscript was separated, and a stencil for mimeographing was prepared. This stencil is printed on a rotary copying machine (IIEX 110TAIIv10).
00) I printed it.

In the case of the standard product, when separating the document after xenon flash irradiation, the thick text or solid printing portion of the document fused to the film surface, resulting in damage to the fused portion of the thermal stencil paper and its surrounding area.

Even finer and smaller letters caused minute fusion, resulting in so-called print removal. When printing was carried out using this stencil, the mimeograph ink passed through the fused portion and the surrounding portion excessively, and a printed image reproducing the original image could not be obtained.

On the other hand, in the embodiment of the present invention, there are no wrinkles and no silicone migration, so there is no problem when separating the original after xenon flash irradiation, the separation is easy, and there is no fusion to the original or the perforated part. No clothing was allowed. In printing, the flow of mimeograph ink is extremely good, and as a result, the printed image is extremely clear and has a good quality of over 5000 copies.
Moreover, it was possible to obtain printed matter that faithfully reproduced the original image.

On the other hand, in Comparative Example 1, the silicone migrated to the original and seriously stained the original. In addition, the original was fused to the area where the silicone had transferred, resulting in plate removal.

A clear image could not be obtained when printing using this plate. In the case of Comparative Example 2, the wrinkles that occurred during heating and drying after silicone application inhibited the adhesion between the film surface and the original during plate making, and the areas that did not adhere were not perforated, making it impossible to obtain a printed image that reproduced the original image. I couldn't.

patent applicant Tomoekawa Paper Mill Co., Ltd. 5C

Claims (1)

[Claims] A heat-sensitive stencil board in which a vinylidene chloride copolymer film and a porous thin paper or a mesh-like sheet are bonded together with an adhesive, and a silicone coating layer is provided on the surface of the film, characterized in that a room temperature curing silicone is used as the silicone. Heat-sensitive stencil paper.