JPH07104593B2 - Light-shielding masking film - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light-shielding masking film used for photoengraving, which comprises a base film and a light-shielding release layer. More specifically, it relates to a light-shielding masking film having light-shielding property, film-forming property, aging resistance, easy peeling property, and re-adhesion property.

[Prior Art] Conventionally, in a light-shielding masking film used for photoengraving, (a) the material of the release layer on the plastic support is a rubber-like substance having good adhesiveness to the plastic support (for example, Nitrile rubber), a mixture of a substance which is compatible with the nitrile rubber and which is not sticky at room temperature and a light-shielding dye / pigment, and which is applied on the plastic support (see JP-A-54-104902), (B) A release layer comprising a resin composition containing at least an acrylic rubber, a vinyl chloride resin and a light-shielding dye (further compounded with a matting agent) is provided on one surface of a translucent plastic film support (special feature). (See Japanese Patent Laid-Open No. 61-110141), (C) (1)
A pressure-sensitive adhesive layer is provided on a plastic support, and (a) nitrile rubber (b) nitrocellulose (c) is provided on the layer.
An adhesive modifier (d) provided with a light-shielding release layer containing a light-shielding colorant, or the adhesive modifier (c) is one of an aliphatic ester, a trimellitic acid ester, an epoxy compound and a polyester compound. Or two or more kinds (Japanese Patent Laid-Open No. 61-61
-166549), (d) (A) vinyl acetate-ethylene copolymer latex, vinyl chloride-ethylene copolymer latex on a transparent plastic support,
Transparent formed from at least one latex selected from the group consisting of vinyl chloride-vinyl acetate-ethylene terpolymer latex, polyacrylic acid ester latex, polymethacrylic acid ester latex, polyester resin latex and polyurethane resin latex A release layer and (C) an oil-soluble colored resin layer containing a thermoplastic resin having good adhesiveness to the transparent release layer and a colorant are sequentially formed (Japanese Patent Laid-Open No. 143758/1986). reference),
(E) A laminated layer made of a polyethylene terephthalate film having a thickness of 10 to 75 μm is formed on a transparent support having a thickness of 50 to 200 μm via a hot melt layer made of ethylene vinyl acetate, polyethylene, 1.2 nylon or the like, There is a laminate (see Japanese Utility Model Laid-Open No. 55-133442) in which a light-shielding scribe-appropriate layer is provided on the laminate layer so that the releasability from the transparent support and the scribe-appropriate are shared.

However, the light-shielding masking film as described above is used for photoengraving by cutting and peeling the light-shielding release layer on any pattern etc. However, there is a drawback in that the work effort and the light-shielding masking film up to that point are wasted because they cannot be restored. Furthermore, in the case where the rubber-like substance is provided directly on the base film, the stability of the peeling layer, the strength, and the elongation of the peeling layer are stable because the stability against daytime or temperature and humidity is poor. If you have the disadvantage that it is not present (due to deterioration of rubber, vinyl chloride, etc.), or if you want to form multiple layers of coating, a long drying time is required because the coating is thick, and the line speed is slow and cost is low. It has a drawback that the cost is increased, and that the number of constituent layers is large and the cost is also increased.

[Object of the Invention] In view of the above-mentioned conventional problems, the present invention imparts re-adhesiveness in addition to extremely good light-shielding property, film-forming property, aging resistance, and easy peeling property, so that the light-shielding property can be imparted to any pattern or the like. In the process of cutting and peeling the peeling layer and using it for photolithography, even if it is cut and peeled by mistake, it can be restored to its original state, and the work effort and the light-shielding masking film up to that point are wasted. The purpose of the present invention is to provide a low-cost light-shielding masking film that does not have any cost.

[Structure of the Invention] That is, according to the present invention, in a light-shielding masking film in which a re-adhesive light-shielding release layer (20) is provided on a base film (10), the base film (10) is a polyethylene terephthalate film, The adhesive light-shielding release layer (20) is a re-adhesive re-adhesive release layer (21) made of an ethylene-vinyl acetate copolymer and an intermediate layer (22) made of polyethylene are formed by a coextrusion method, Furthermore, a light-shielding layer (23) made of a mixture of a rubber-like substance, a substance compatible with the rubber-like substance and a light-shielding colorant is applied and formed on the intermediate layer (22). The present invention relates to a light-shielding masking film.

That is, a resin such as a rubber-like substance, a vinyl chloride resin, a vinyl chloride copolymer, nitrocellulose, acetylcellulose, a mixture of a polyurethane resin and an acetic acid fibrous resin mixed with a plasticizer on a conventional base film. A vinyl acetate-ethylene copolymer latex, vinyl chloride-vinyl chloride-ethylene copolymer latex, or vinyl chloride-on the base film, which was provided by coating and drying a solvent solution of a mixture of a light-shielding dye and pigment, was provided.
Through a latex transparent release layer such as ethylene copolymer latex, vinyl chloride-vinyl acetate-ethylene terpolymer latex, polyacrylic acid ester latex, polymethacrylic acid ester latex, polyester resin latex and polyurethane resin latex,
Ethylene vinyl acetate, polyethylene, 1 or 1 is provided on the light-shielding release layer in which a thermoplastic resin and an oil-soluble colored resin layer containing a colorant are sequentially formed on the transparent release layer, or on the base film.
A light-shielding masking layer of the present invention is used instead of the light-shielding release layer in which a laminate layer made of a polyethylene terephthalate film is provided through a hot melt layer made of 2 nylon or the like, and a light-shielding scribe-appropriate layer is provided on the laminate layer. Regarding the film, in the light-shielding masking film in which the re-adhesive light-shielding release layer (20) is provided on the base film (10), the base film (10) is a polyethylene terephthalate film, and the re-adhesive light-shielding release layer is used. A re-adhesive release layer (21) made of ethylene-vinyl acetate copolymer (20) having re-adhesiveness and an intermediate layer (22) made of polyethylene are formed by a co-extrusion method, and further the intermediate layer ( 22) A light-shielding layer (23) composed of a mixture of a rubber-like substance, a substance compatible with this rubber-like substance and a light-shielding colorant is applied on the above. And that form, in particular (among other things) the re-adhesive release layer (21)
By forming the intermediate layer (22) and the intermediate layer (22) by a coextrusion method, a light-shielding masking film having extremely good light-shielding property, film-forming property, aging resistance, easy peeling property, and re-adhesive property is completed. is there.

That is, in the present invention, a polyethylene terephthalate film is used as the base film (10), and a re-adhesive release layer (21) made of an ethylene-vinyl acetate copolymer is additionally formed thereon.
A re-adhesive release layer (21) and an intermediate layer (22) by coextrusion of an intermediate layer (22) made of
A two-layer structure, and the intermediate layer (2
A re-adhesive light-shielding release layer (20) having a three-layer structure is formed by applying a light-shielding layer (23) of a mixture of a rubber-like substance, a substance compatible with the rubber-like substance, and a light-shielding colorant onto the 2). It is possible to provide a light-shielding masking film to which re-adhesiveness is imparted in addition to excellent light-shielding property, film-forming property, aging resistance, easy peeling property, by laminating (4).

The base film (10) constituting the light-shielding masking film of the present invention has sufficient self-holding property and is laminated with a re-adhesive light-shielding release layer (20) obtained by coextrusion method and coating. A transparent one that can withstand a pair of nip roll pressures at the same time and is optically free of optical unevenness is required, and a polyethylene terephthalate film is preferable as one satisfying such conditions. More preferably, a biaxially stretched film of polyethylene terephthalate film is suitable. The thickness is about 50 to 200 μm, and more preferably about 75 to 125 μm is preferable from the viewpoint of continuous mass production of a light-shielding masking film without wrinkles or cracks.

The thickness of the re-adhesive light-shielding release layer (20) formed on the base film (10) of the light-shielding masking film of the present invention is not particularly limited, but is usually appropriately selected from the range of 10 to 30 μm.

In the light-shielding masking film of the present invention, as the resin for forming the re-adhesive release layer (21) constituting the re-adhesive light-shielding release layer (20), a coextrusion-processable ethylene-vinyl acetate copolymer is used. Polymers are suitable. The reason is that the re-adhesiveness of the ethylene-vinyl acetate copolymer can be arbitrarily controlled by changing the ratio of ethylene and vinyl acetate. Therefore, by appropriately selecting the ratio of the both, the re-adhesiveness and peeling property can be obtained. In addition, ethylene is preferable because it has the effect of increasing the adhesion strength to the intermediate layer (22). In addition, since the layer can be formed without using an organic solvent or the like because the co-extrusion method is possible, it does not require a long drying time as in the case of coating a coating solution dissolved in an organic solvent or the like, and thus the line speed is It is preferable because it can be manufactured at a low cost and does not pollute the environment.

In the light-shielding masking film of the present invention, polyethylene capable of coextrusion is suitable as the resin for forming the intermediate layer (22) that constitutes the re-adhesive light-shielding release layer (20). The reason is that polyethylene is preferable because it has high adhesion strength to the re-adhesive release layer (21) made of an ethylene-vinyl acetate copolymer. In addition, since the layer can be formed without using an organic solvent or the like because the co-extrusion method is possible, it does not require a long drying time as in the case of coating a coating solution dissolved in an organic solvent or the like, and thus the line speed is It is preferable because it can be manufactured at a low cost and does not pollute the environment. Furthermore, polyethylene is a stable substance, and is composed of a light-shielding layer (23) mainly composed of a rubber-like substance and a light-shielding colorant formed by coating on the intermediate layer (22), and a re-formation film composed of an ethylene-vinyl acetate copolymer. It is located in the middle of the adhesive release layer (21) and prevents attack of the re-adhesive release layer (21) from the solvent at the time of applying the coating liquid dissolved in the organic solvent of the light shielding layer (23), Moreover, since the mutual chemical and physical influences of the light-shielding layer (23) and the re-adhesive release layer (21) are blocked, the re-adhesive release layer (21) has good releasability and re-adhesiveness for a long period of time. This is preferable because it has the effect of maintaining the state.

In the light-shielding masking film of the present invention, the mixture for forming the light-shielding layer (23) constituting the re-adhesive light-shielding release layer (20) has an acrylonitrile content of 20.
A vinyl chloride-vinyl acetate copolymer having a copolymerization ratio of acrylonitrile-butadiene copolymer (rubber) to vinyl chloride monomer and vinyl acetate monomer of 80 to 95:20 to 5 by weight. Is a good mixture. Further, this mixing ratio is more preferably used in the range of 30 to 50:70:50.

Further, a colorant is used to impart a light-shielding property to the light-shielding layer (23), but it is possible to use a dye or a pigment and a mixture of a dye and a pigment, and to satisfy the light-shielding property as a light-shielding masking film, a resin There is no particular limitation on the type and the addition amount as long as they are compatible with.

The re-adhesive release layer (21) and the intermediate layer (22) of the light-shielding masking film of the present invention are formed by using a resin for forming the re-adhesive release layer (21) and the intermediate layer (22) in a usual manner. Formed and laminated by the melt co-extrusion method.

The light-shielding layer (23) of the light-shielding masking film of the present invention is formed by re-adhering the solvent solution of the mixture for forming the light-shielding layer (23) by a usual roll coater method or a gravure coater method. A re-adhesive release layer (21) and an intermediate layer (22) which are formed by coating and drying on the intermediate layer (22) of a laminate comprising the release layer (21) and the intermediate layer (22)
And a re-adhesive light-shielding release layer (20) comprising the light-shielding layer (23).

The re-adhesive light-shielding release layer (20) thus obtained is a re-adhesive release layer (21) (ethylene-vinyl acetate copolymer) of the base film (10) and the re-adhesive light-shielding release layer (20). ) Side to face and are sandwiched by a pair of nip rolls to form a light-shielding masking film of the present invention.

Next, the present invention will be described with reference to examples. All% in the examples are% by weight.

[Example] Example 1 Ethylene-vinyl acetate copolymer (20% vinyl acetate) Polyethylene and two kinds of resins were fed from an extruder, respectively, and T
A die having a total thickness of 15 μm and comprising a re-adhesive release layer (21) and an intermediate layer (22) having a total thickness of 15 μm was obtained by a die with a thickness of 10 μm and 5 μm, respectively.

Next, the side surface of the ethylene-vinyl acetate copolymer of a laminate comprising a biaxially stretched polyethylene terephthalate film (base film (10)) having a thickness of 100 μm, the re-adhesive release layer (21) and an intermediate layer (22). Were laminated so as to be sandwiched by a pair of nip rolls so as to match each other to obtain a laminate composed of three layers having a total thickness of 115 μm.

Furthermore, acrylonitrile-butadiene rubber with an acrylonitrile content of 33% by weight, vinyl chloride 90% and vinyl acetate
The 10% mixture was dissolved in a mixed solvent of a mixture ratio of methyl ethyl ketone to toluene of 2: 1 and 2% of a light-shielding dye (Neozapon Orange RE, manufactured by BASF) was mixed, and the above three layers were obtained. After the polyethylene surface of the laminate made of is treated by corona discharge, the coated surface is dried and the thickness is 10 μm.
The light-shielding layer (23) was formed to obtain a light-shielding masking film of the present invention having a total thickness of 125 μm.

The adhesive strength between the biaxially stretched polyethylene terephthalate film (10) and the re-adhesive release layer (21) is a 25 mm wide test piece.
15g / 25mm (180 degree peeling), the adhesive strength between the re-adhesive peeling layer (21) and the intermediate layer (22) and the adhesive strength between the intermediate layer (22) and the light-shielding layer (23) are both 2.4kg. It was / 25mm or more. The re-adhesive release layer (21) and the intermediate layer (2
The re-adhesive light-shielding release layer (20) comprising 2) and the light-shielding layer (23) had an elongation of 120%. Moreover, the biaxially stretched polyethylene terephthalate film (10) and the re-adhesive light-shielding release layer (20) had an appropriate re-adhesive property on the ethylene-vinyl acetate copolymer surface.

[Effects of the Invention] Using the light-shielding masking film obtained in Example 1, a light-shielding release layer was cut into an arbitrary pattern or the like as in the case of use for photoengraving, and once peeled, it was re-adhered. It was restored to its original shape and then cut again into another pattern to make a mask for photoengraving according to the desired pattern. This effect is an effect that cannot be expected from conventional products.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of the light-shielding masking film of the present invention. (Reference numeral in the drawing) (10): Base film (20): Re-adhesive light-shielding release layer (21): Re-adhesive release layer (22): Intermediate layer (23): Light-shielding layer

Claims (1)

[Claims] 1. A light-shielding masking film comprising a re-adhesive light-shielding release layer (20) provided on a base film (10), wherein the base film (10) is a polyethylene terephthalate film, and the re-adhesive light-shielding release is provided. The layer (20) is a re-adhesive release layer (21) made of an ethylene-vinyl acetate copolymer having re-tackiness and an intermediate layer (22) made of polyethylene are formed by a co-extrusion method, and the intermediate layer is further formed. (22) A light-shielding masking film, characterized in that a light-shielding layer (23) made of a mixture of a rubber-like substance, a substance compatible with the rubber-like substance and a light-shielding colorant is applied and formed thereon. .