JPH0410048Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a light-shielding synthetic resin coating layer on a transparent support, and by making incisions in the coating layer and peeling off the necessary parts, various types of coatings can be immediately applied. This relates to a peel-off film that can be used to create original drawings.

[Conventional technology]

Conventionally, the material used for the light-shielding synthetic resin film layer of peel-off films is vinyl chloride resin, vinyl chloride copolymer resin, nitrocellulose, or other resins with plasticizers added, but the surface of the resin layer It was highly sticky and had low peel strength, making it difficult to work with.

In order to improve these defects, a mixed resin of polyurethane resin and cellulose acetate resin was used for the resin layer (Japanese Patent Publication No. 51-25478), or a mixture of nitrile rubber and vinyl chloride/vinyl acetate copolymer resin, etc. It was also proposed to use a mixture (Japanese Patent Publication No. 1983-46011), or a mixture of ethylene/vinyl acetate/carbon monoxide ternary copolymer and vinyl chloride/vinyl acetate copolymer (Japanese Patent Publication No. 1986-46011). 159853) and
In both cases, the stickiness and releasability of the resin layer surface have been significantly improved.

[Problem that the invention attempts to solve]

However, in any case, the thickness of the film must be 20 to 30 μm in order to obtain a film strength that does not interfere with peeling work.
In general, paints are organic solvent-based low-concentration, high-viscosity liquids, and the viscosity cannot be increased too much due to coating constraints. There is a problem that the processing speed does not increase.

[Means for solving problems]

In order to solve the above-mentioned problems, the present inventors have conducted extensive research on the structure and material of the light-shielding synthetic resin film layer, and as a result, they have developed a new structure and material of the light-shielding synthetic resin film layer that does not have the above-mentioned problems. This is the completed version of the heading book idea.

That is, in the present invention, a light-shielding synthetic resin film layer is adhered to a colored synthetic resin film layer A formed from an organic solvent-based paint provided on a transparent support, and a colored synthetic resin film layer A laminated thereon. Synthetic resin film layer B formed from a paint made by mixing or not mixing a light-shielding dye and pigment with one or more mixtures of resins having a glass transition point Tq of 5°C to 50°C. It is a peel-off film characterized by being composed of two layers.The two-layer structure reduces the amount of coating per layer, shortens drying time, and increases coating speed. If light-shielding dyes and pigments are mixed in the synthetic resin film layer B, even if pinholes occur in the colored synthetic resin film layer A due to bubbles during coating and the light-shielding property is lost, the synthetic resin film layer B will remain intact.
The present invention provides a peel-off film with extremely high productivity, as the light-shielding property can be restored by laminating the film.

〔Example〕

In FIG. 1, 1 indicates a transparent support, 2 indicates a colored synthetic resin layer A, and 3 indicates a synthetic resin layer B, respectively.

The transparent support used in the peel-off film of the present invention includes polyethylene terephthalate,
Mention may be made of transparent plastic films of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, triacetate and the like. In particular, biaxially stretched polyethylene terephthalate film has strength, dimensional stability,
It is preferable because it is excellent in terms of transparency and the like.

On the other hand, the colored synthetic resin film layer A is not particularly limited as long as it is formed from an organic solvent-based paint, can be peeled off from the transparent support, and has light-shielding properties. A resin layer formed from an organic solvent-based paint has a good balance between removability and adhesion of the resin layer.

Next, there are no particular restrictions on the resin used for the synthetic resin film layer B, as long as it is a resin that has adhesive properties to the underlying colored synthetic resin film layer A and has a glass transition point Tq of 5°C to 50°C. Although a wide range of solvent-based resins and water-based resins can be selected, ethylene-vinyl acetate copolymers, vinyl chloride, ethylene-vinyl acetate copolymers, etc. terpolymer,
Vinylidene chloride copolymers and the like are advantageously used. The glass transition point Tq ranges from 5°C to 50°C,
Preferably it is 10°C to 40°C. Glass transition point Tq
If Tq is below 5°C, problems such as blocking will occur during use and storage of the peel-off film due to stickiness on the surface of the resin layer, and if Tq is above 50°C, the flexibility of the resin layer will be impaired and the film may break during peeling. occurs and removability decreases.

Furthermore, these resins may be either organic solvent-based or water-based, but when a water-based emulsion type resin is used, it is possible to obtain a highly concentrated and low viscosity paint, which contributes to shortening the drying time, which is the purpose of the present invention. Particularly preferred for achieving this. However, when a synthetic resin film layer made of an aqueous emulsion type resin is provided directly on a transparent support, the peel-off film obtained is insufficient in terms of the strength of the release film and the balance between releasability and adhesion. After peeling, problems such as the remaining resin layer lifting from the transparent support occur during various handling, and it is not possible to satisfy the performance required for a peel-off film with just one synthetic resin film layer made of a water-based emulsion type resin. .

In other words, the water-based emulsion type resin is
The peel-off film can only be used in the resin layer when it is used as the upper layer (synthetic resin film layer B) of the layered resin layer.

Furthermore, in order to control the film strength, flexibility, etc. of the synthetic resin film layer B, a plurality of these resins may be mixed and used if necessary.

The synthetic resin film layer B is provided with a matting agent for the purpose of improving slipperiness and matting, and an antistatic agent for preventing the generation of static electricity, and the synthetic resin film layer is provided on the colored resin film layer A below. In order to improve the coating properties, a leveling agent, an antifoaming agent, a surfactant, etc. may be added as necessary. In addition, it is possible to arbitrarily choose whether or not to mix light-shielding dyes and pigments, but if they are mixed, as described above, the light-shielding property will be lost due to pinholes that occurred during the formation of the underlying colored resin film layer A. This can contribute to improving the production yield of the peel-off film. In this case, it is advantageous to use dyes and pigments to be mixed that are highly miscible with the resin used, have little change in color tone or fading due to factors such as heat and light, and can satisfy the necessary light-shielding properties. There are no particular limitations on its color tone or structure. The amount of the colorant to be added may be determined so as to satisfy the necessary light-shielding properties within a range that does not significantly reduce the adhesion, film strength, etc. of the synthetic resin film layer B.

[Effect]

In the two-layer light-shielding synthetic resin film layer of the present invention, the colored synthetic resin film layer A provides releasability from the transparent support, and the synthetic resin film layer B is laminated on the colored synthetic resin film layer A. It provides the film strength necessary for the resin layer of the peel-off film.The two-layer structure reduces the amount of coating per layer, shortens drying time, increases coating speed, and improves productivity. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a peel-off film according to the present invention. In the figure, 1...Transparent support, 2...Colored synthetic resin film layer A, 3...Synthetic resin film layer B.

Claims (1)

[Scope of utility model registration request] In a peel-off film in which a peelable light-shielding synthetic resin film layer is formed on a transparent support, the light-shielding synthetic resin film layer is a colored synthetic resin film layer formed from an organic solvent-based paint provided on the transparent support. The glass transition point Tq that has adhesive properties between A and the colored synthetic resin film layer A laminated thereon is 5°C.
It is composed of two layers: a synthetic resin film layer B formed from a paint made by mixing one or more resins at a temperature of ~50°C with or without light-shielding dyes and pigments. Features a peel-off film.