JPS61258742A - Method of forming surface protective layer and surface protective layer attached sheet used for said method - 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 (Field of Industrial Application) The present invention relates to a surface protective layer-applied sheet used for the purpose of applying a protective layer to the surface of various films, sheets, plates, etc.

(Prior art) Various display boards such as original plates, advertisements, and signboards used in the printing plate-making process are used to protect the surfaces of high-quality printed matter, photographs, etc. to prevent stains, scratches, or surface deterioration. Films are widely used. Conventionally, the surface protection of such films, sheets, plates, etc. has generally been carried out by adhering a plastic film coated with an adhesive to the surface.

In this case, the surface protection layer is a plastic film, and by selecting the type of film, surface protection with excellent weather resistance, heat resistance, solvent resistance, abrasion resistance, etc. can be achieved.

However, in this method of bonding plastic films, it is difficult to reduce the thickness of the film due to the handling of the film. On the other hand, it is desirable that the surface protective layer be as thin as possible and have that function.

For example, when protecting the easily damaged silver emulsion surface of an original plate used in a plate-making process, etc., the thickness of the surface protective layer is particularly important. That is, when printing a pattern onto a photosensitive material other than the original, a thick surface protective layer causes a decrease in resolution due to light refraction. Furthermore, in contact baking, in order to suppress the occurrence of Newton's rings caused by poor adhesion, it is preferable to mattify the surface protective layer to an extent that does not impair its transparency. Also, in various display materials, the thinner the surface protective layer is, the better in order to prevent light scattering on the surface.

However, in the conventional method of bonding plastic films, it is difficult to reduce the thickness of the film due to the handling of the film, and the thickness of the film is limited to at least 25μ or more, and it cannot be used in plate-making processes. There is a problem with the original version etc.

(Problems to be Solved by the Invention) The present invention solves these problems, allows the thickness of the surface protective layer to be freely controlled, and has functions such as matting and antistatic properties. The present invention provides a method for forming a surface protective layer and materials for use therein.

Means for Solving Problem C) When forming a protective layer on the surface of a surface-protected material such as a film, sheet, or plate, the present invention provides a method for forming a protective layer on a support that is removable from the support and has adhesive properties. The adhesive surface of the surface protection layer-applied sheet provided with the surface protection layer is overlapped and adhered to the surface of the material to be surface protected, the support is peeled off, and the surface protection layer is transferred onto the material to be surface protected. The present invention relates to a method for forming a surface protective layer and a surface protective layer provided sheet used therein.

The present invention will be explained in more detail below.

Examples of the support for the surface protection layer provided sheet of the present invention include polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, and triacetate.

A wide range of materials can be selected from transparent or opaque plastic films such as polyimide, or sheets of paper, cloth, etc.

In particular, biaxially stretched polyethylene terephthalate film is preferably used because it is excellent in strength, heat resistance, 9-dimensional stability, and the like.

The thickness of the support is not particularly limited, but a thickness of about 50 to 150 μm is suitable for handling.

The resin for the surface protective layer has weather resistance and heat resistance.

Chemical resistance, solvent resistance, abrasion resistance, etc. are required, but they may be selected depending on the purpose and are not particularly limited.

Resins used for this purpose include epoxy resins, urethane resins, acrylic resins, vinyl chloride resins, vinylidene chloride resins, chlorinated rubber, chlorinated polyolefins, alkyd resins, polyester resins, and amine resins. .

Examples include melamine resin 1, which may be used alone or in combination.

Furthermore, in order to impart an antistatic function to the surface protective layer, an antistatic agent or the like may be mixed and used. Antistatic agents include surfactants, conductive resins, fine metal powders, etc., and are appropriately selected and used depending on the purpose. Antistatic agents used for this purpose include anionic surfactants, cationic surfactants, nonionic surfactants, conductive resins, conductive metal fine powders, and conductive metals. Those commonly used as antistatic agents, such as oxides, can be used.

Depending on the resin used for the surface protection layer, a release layer may be placed between the support and the surface protection layer to improve releasability from the support and adhesion to the surface protection material. It is more effective to provide an adhesive layer on the upper layer.

As the release layer, depending on the support used and the resin of the surface protection layer, polymers or prepolymers with release properties conventionally used for release paper, etc., such as silicone resins, alkyd-based resins, etc. Resins, urethane resins, polyester resins, amino resins, phenol resins, etc. may be used alone or in combination.

Furthermore, these polymers or prepolymers can be provided with functional groups in their side chains or terminals so that they can be crosslinked or polymerized by light or radiation.

The adhesive layer is not particularly limited, and may be a heat-sensitive adhesive, a pressure-sensitive adhesive, a photocurable resin, or the like, taking into consideration the heat resistance of the material to be surface protected.

Examples of heat-sensitive adhesives include the following film-forming polymeric substances, polyacrylic esters and acrylic ester copolymers, polymethacrylic esters and methacrylic ester copolymers, and polyacrylamide. and acrylamide copolymers, polyvinyl acetate and vinyl acetate copolymers, polyvinyl chloride and vinyl chloride copolymers, polyvinylidene chloride and vinylidene chloride copolymers, polystyrene and styrene copolymers, ethylene and vinyl acetate, ethylene and acrylic acid esters, ethylene and vinyl chloride, ethylene copolymers such as ethylene and acrylic acid.

Polyvinyl acetal polyester resins such as Polyvinyl Yaputi Raya and Po1 Peel Yaoya-21.

Polyamide resin such as nylon copolymerized nylon.

Various rubbers such as synthetic rubber and chlorinated rubber, polyolefins, etc. can be used alone or in combination, but the bonding temperature 1
It should be selected in consideration of adhesion to the surface protective layer and the material to be surface protected.

As the pressure-sensitive adhesive, the following commonly used adhesives are used. That is, ethylene vinyl acetate copolymer, vinyl chloride-vinyl propionate copolymer, and polyolefin resin.

PVC polymer, ethylene-carboxylic acid ester copolymer, water-soluble polyvinyl acetal resin.

Butyral resin, formal resin, vinylidene chloride resin, chlorinated polyolefin, chlorinated ethylene-vinyl acetate copolymer, acrylic resin.

Rubber resins, etc. may be used, and these may be used alone or in combination, and a wide range of adhesives can be used in addition to these, and there are no particular limitations.

Depending on the material to be surface protected, it may be preferable for the surface protection layer to be matte. For example, when printing an original plate used in a printing plate-making process onto another photosensitive material by contact printing, the original plate is used to improve the vacuum adhesion between the original plate and the photosensitive material to the extent that transparency is not impaired or resolution is affected. It is necessary to matt the surface to a degree that does not extend to the surface.Depending on the purpose, the surface protective layer of the present invention can be matted by adding a transparent pigment or the like.

In addition, if a pigment or the like is added to the release layer to make it matte, and after peeling off, the matte pattern is transferred to the surface protective layer, matting can be achieved without reducing the transparency of the surface protective layer, making it a useful material. It's a method. Matting agents used for this purpose include inorganic fine particles such as silicon dioxide, calcium carbonate, and alumina, as well as polyethylene and polypropylene.

Polyethylene terephthalate, polystyrene.

Polycarbonate, acrylic ester resin.

There are plastic powders such as methacrylic acid resin, polyacrylonitrile and acrylonitrile copolymers, and fine powders such as starch and cellulose. The particle size of the matting agent is suitably from 0.01μ to 20μ, and the surface of the surface protective layer can be made into a desired matte by controlling the particle size of the type of matting agent and the amount added depending on the purpose.

The present invention has been described in detail above, but in order to further clarify the method of forming a surface protective layer of the present invention and the structure of the surface protective layer-applied sheet used therein, simple drawings are attached. However, the present invention is not limited thereto.

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

Example 1 Release layer forming liquid> (Ethyl Cellosolve 50) Surface protective layer forming liquid> Heat-adhesive layer forming liquid> The release layer forming liquid was applied to one side of a biaxially stretched polyethylene terephthalate film with a thickness of 75μ. Coat with a Mayer bar on the surface that has been previously subjected to corona discharge treatment, and apply 100%
℃ for 1 minute to form a release layer with a thickness of about 3μ. Furthermore, this coating was completely cured. Next, a surface protective layer forming liquid was applied thereon using a Mayer bar so that the thickness after drying was approximately 6 μm, and dried at 100° C. for 1 minute to obtain a surface protective layer. Further, a heat-fusible layer forming liquid was applied thereon using a Mayer bar to a thickness of 2 μm after drying, and dried at 100° C. for 1 minute to obtain a surface protection layer-provided sheet on which a heat-fusible layer was laminated.

The adhesive surface of the surface protection layer provided sheet is coated with a silver salt lithium film (
When layered on the emulsion side of the lith film (exposed and developed), pressed with a roller heated to 0°C, and then peeled off from the release layer of the surface protective layer-applied sheet, the surface protective layer easily heat-fuses onto the emulsion side of the lith film. It was attached and transcribed. Furthermore, the adhesion after transfer was good. The surface of the surface protective layer was matte, and it was possible to suppress the occurrence of Newton's rings due to poor adhesion during contact firing.

This transferred surface protective layer had excellent weather resistance, heat resistance, chemical resistance, solvent resistance, abrasion resistance, etc., and had a sufficient function as surface protection.

Example 2゜Surface protective layer forming liquid> Example 1 until mold release layer formation. I did it exactly the same way. Next, a surface protective layer forming liquid was applied thereon using a Mayer bar to a thickness of 5 μm after drying, and dried at 100° C. for 1 minute to obtain a surface protective layer-provided sheet on which a surface protective layer was laminated.

When the adhesive side of the surface protective layer-applied sheet is overlapped with the emulsion side of a photomask (made of glass), pressed with a roller heated to 110°C, and then peeled off from the release layer of the surface protective layer-applied sheet, the surface protective layer is removed. It was easily fused and transferred onto the emulsion side of the photomask. Furthermore, the adhesion after transfer was good. The surface of the surface protective layer was matte, and it was possible to suppress the occurrence of Newton's rings due to poor adhesion during contact firing.

This surface protective layer has excellent weather resistance, heat resistance, chemical a resistance, solvent resistance, abrasion resistance, etc. Similarly, it had a sufficient surface protection function.

Example 3 Surface protective layer forming liquid> Example 1 until mold release layer formation. I did it exactly the same way. Next, a surface protection forming liquid was applied thereon using a Mayer bar to a thickness of 5 μm after drying, and dried at 115° C. for 1 minute to obtain a surface protection layer. Further, a heat sealing forming liquid was applied thereon in exactly the same manner as in Example 1 to obtain a surface protection layer-provided sheet on which a heat sealing layer was laminated.

When the adhesive side of the surface protection layer provided sheet is overlapped with the emulsion side of the lith film and pressed with a roller heated to 100°C and then peeled off from the release layer of the surface protection layer provided sheet, the surface protection layer is removed from the lith film. Easily heat-fused onto the emulsion surface,
Transcribed. Further, the adhesion after transfer was good.

The surface electrical resistivity of this transferred surface protective layer is 1.5X
10'Ω (measured in °C with Toa Denpa Kogyo (a, 5M-9E type super insulation meter)), and was able to prevent dust, dirt, etc. from adhering during handling.Furthermore, the surface of the surface protective layer was matte. In close contact firing, it was possible to suppress the occurrence of Newton rings due to poor adhesion.This surface protective layer has excellent weather resistance, heat resistance, chemical resistance, solvent resistance, abrasion resistance, etc. It had a sufficient surface protection function.

(Effects of the invention) The surface protective layer formed by the method of the present invention had excellent weather resistance, heat resistance, chemical resistance, solvent resistance, abrasion resistance, etc., and had a sufficient function as surface protection. .

[Brief explanation of the drawing]

FIG. 1 shows a method for forming a surface protective layer. Figure 2 shows the structure of a sheet with a surface protective layer applied. Patent applicant: Sanyo Kokusaku Pulp Co., Ltd. (5 others)

Claims (1)

[Claims] 1. When forming a protective layer on the surface of a surface-protected material such as a film, sheet, or plate, a surface that is removable from the support and has adhesive properties is provided on the support. The method is characterized in that the adhesive surface of the surface protective layer-provided sheet provided with the protective layer is laminated and adhered to the surface of the material to be surface protected, and then the support is peeled off and the surface protective layer is transferred onto the material to be surface protected. Method for forming a surface protective layer. 2. A surface protection layer-provided sheet comprising a support provided with a surface protection layer that is removable from the support and has adhesive properties. 3. The surface protective layer-provided sheet according to claim 2, wherein the surface protective layer has heat-fusible properties and is removable from the support. 4. Claim 2, characterized in that the surface protective layer is releasable from the support, and further includes either a heat-adhesive layer or a pressure-sensitive adhesive layer on top of the surface protective layer. A sheet provided with a surface protective layer as described in . 5. A sheet provided with a surface protective layer as set forth in claim 2, characterized in that a release layer is provided between the surface protective layer and the support. 6. The surface protective layer provided sheet according to any one of claims 2 to 5, wherein at least one of the surface protective layer and the release layer is matted. 7. The surface protective layer provided sheet according to any one of claims 2 to 6, wherein the surface protective layer is provided with an antistatic function.