JPS6289968A - Resticking masking film - Google Patents

Abstract

PURPOSE:To make it possible to effect a precise photolithography by forming a base film layer and a protective film layer with a polyester film, and by forming a release layer provided on the protective film with a reactive copolymer having a long chain alkyl group respectively. CONSTITUTION:Both the transparent base film layer and the protective film layer are formed by the polyester film having a relatively large critical surface tension, thereby maintaining an anchor effect of a shade sticking layer, and the release layer is formed by the copolymer having the long chain alkyl group, thereby maintaining the suitable anchor effect to the polyester film and the suitable releasing property. thus, the adhesion for the protective film and the suitable releasing property from the base film layer make it possible to coexist with each other. Therefore, a floating along a cutting surface does not generate when the titled film is cut with a cut knife.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a substantially transparent base film layer, a release layer,
The present invention relates to a re-adhesive masking film in which a light-shielding adhesive layer and a protective film layer are laminated.

(]]) Prior Art Conventionally, the following are known as typical masking films for plate making.

The first masking film is made by coating a rubber-based pressure-sensitive adhesive on a peelable layer based on glassine paper, waxed paper, vinyl chloride or a vinyl chloride copolymer, and forming a masking layer of nitrocellulose. This is a laminate made by overcoating a series of lacquers (for example, US Pat. No. 357-G-491).

The second masking film was made of ethylene terephthalate as a base film layer, and dyed vinyl chloride was coated on top of the base film layer.

(e) Problems to be Solved by the Invention However, the first masking film is susceptible to dimensional changes due to the temperature and humidity of the working atmosphere.
In addition, it has problems in heat resistance dimensional stability and moisture absorption dimensional stability, such as being susceptible to expansion and contraction due to the heat of the light source used in the production of photographic master plates 11.7.

Also, in the case of nitrocellulose lacquer, the number of layers is relatively 7.
Due to the thickness between the film and the releasable sheet layer and the thickness between the protective film and the film, a discrepancy occurs between the photorealistic image and the photorealistic object.As a result, the product is not suitable for situations where precise photorealism is required.

Furthermore, the base film that has been peeled off and separated from the protective film layer has drawbacks such as being susceptible to breakage and elongation due to insufficient strength.

On the other hand, the masking film of fPa2 is vinyl chloride J1
Once removed, it is virtually impossible to reattach it to a base film or to a silk screen or photographic plate.

Furthermore, recently, products that use polypropylene film for the base film layer and protective film layer and add dye to acrylic adhesive to form a light-shielding adhesive layer, which is considered to be an improved type of the above, have been commercially available. Since the film layer and (LJ film layer) are formed of the same polypropylene film, it is necessary to perform mold release treatment on the base film layer in order to peel the protective film layer from the base film layer. This caused the following problems.

First of all, the first problem is that when using it as a masking film, it is difficult to use a CAD graph or a cut knife.
In order to create a predetermined design, it is canted from the protective film layer, but the critical surface tension of polypropylene film is 3.
1 dyne/c+a, which is relatively small, 3<, so when a polypropylene film (base film layer) is subjected to release treatment with a release layer, the adhesive strength decreases significantly, and as a result, lifting occurs along the cut surface. , the Q part becomes unclear in photoengraving and the like.

The second problem is that when the protective film layer formed with the light-shielding adhesive layer is peeled off from the base film layer,
There was a problem in that the dye contained in the light-shielding adhesive layer was transferred to the base film layer, resulting in poor light transmittance of the base film.

(d) Means for Solving the Problems As a result of various studies to solve the above problems, the inventors have found that both the substantially transparent base film layer and the protective film layer have a relatively low critical surface tension. A large polyester film is used to maintain the anchoring effect of the light-shielding adhesive layer, and a reactive copolymer consisting of a long-chain alkyl copolymer is used as the release layer. The present invention was completed based on the discovery that the present invention can be used in a variety of ways.

In other words, both the base film layer and the protective film layer are one layer at a time! When using a polyester film with relatively high surface tension and a long-chain alkyl copolymer with moderate peelability as a peel angle, it is possible to improve the adhesion to the protective film layer and the base. It was found that it was possible to achieve both appropriate peelability from the film JC'J, and that no lifting occurred along the cant surface when cutting with a cut knife or the like.

That is, the present invention provides a masking film formed by sequentially laminating a substantially transparent base film layer, a release layer, a shielding adhesive XJ cut Ri, and a protective film layer, the base film layer and the protective film layer Both are formed of polyester films, and the release layer is formed of a large-sized combination of long-chain alkyl chains.

The present invention will be explained in detail below.

Substantially transparent base film layer used in the present invention,
Maintenance: Both a film layers must be made of polyester film.

Polyester films have a high critical surface tension, excellent dimensional stability, heat resistance, and mechanical properties, and also have low water absorption and moisture permeability, making them suitable for base film layers and protective film layers.

Examples of the polyester fill 11 used in the present invention include polyethylene terephthalate, polybutylene tere-7-thale, and polyethylene iso-7-thale. It is most preferable because it has a large stability and the above-mentioned dimensional stability, water absorption, heat resistance, and other properties.

The above-mentioned critical surface tension refers to the presence of liquid hydrocarbons on a solid surface. is often a straight line, regardless of the type of congener.

At this time, the value of γ corresponding to θ=0, that is, cos θ=1, is called the critical surface tension of the solid.

The base film layer may be formed of a substantially transparent polyester film;
It is most preferable to use a colorless and transparent polyester film, and both stretched and unstretched polyester films can be used, but biaxially stretched polyester films are particularly preferred in terms of film strength and dimensional stability. is preferably about 6 to 300 μW, and particularly preferably 12 to 150 μW from the viewpoint of ease of handling and workability.

Further, as the protective film layer, either stretched or unstretched polyester film can be used, but a 2-stretched polyester film is preferred from the viewpoint of film strength and dimensional stability, and its thickness is preferably about 3 to 150 AIω. From the viewpoint of handleability, workability, etc., the most desirable range is 6 to 80μIII.

In addition, as the mold release agent included in J[1 in the present invention, long-chain alkyl-based reactive copolymers are suitably used, and specifically, for example, (meth)acrylic copolymers having 12 to 20 carbon atoms are preferably used. Alkyl vinyl ether (C112=
N-alkylacrylamide, a long-chain alkyl vinyl ether co-electropolymer consisting of a copolymer of CI (OI?, R is an alkyl group having 10 to 20 carbon atoms) and maleic anhydride, acrylic acid, acrylonitrile, vinyl acetate, etc. (C
H2= CH-CON HR, R is an alkyl group having 10 to 20 carbon atoms), a long-chain alkyl acrylamide copolymer consisting of a copolymer with acrylonitrile or vinyl acetate, etc., maleic acid monoester (1-TCOOCII =
A copolymer of a long-chain alkyl maleic acid derivative consisting of a copolymer of C+l -C○○R, R1, an alkyl group having 10 to 20 carbon atoms, etc., and vinyl acetate, etc., with a carbon number of 10
A layer of at least one release layer selected from the group consisting of a copolymer of a long-chain alkyl allyl ester consisting of a copolymer of a (meth)acrylic acid alkyl ester and maleic anhydride etc.

These release layers have appropriate anchoring force and release properties with respect to the base film layer and protective film layer.

In addition, the shielding adhesive (4) to be provided on the protective film layer may include an adhesive composition such as acrylic or rubber, which is compatible with the adhesive composition, and which can be used by mixing. Although it is possible to use a composition having a total zero adhesiveness such as plasticity +34 fat, an acrylic adhesive composition having excellent weather resistance and adhesiveness is most preferred.

A dye, a pigment, or a mixture of a dye and a pigment can be used as a coloring agent for imparting light-shielding properties to the sticky m-acid. Examples of the dye include oil dyes, major solvent-soluble dyes,
Examples include metal complex dyes, which have good compatibility with the adhesive composition and are less susceptible to heat and UV light. Color, structure, and structure (the two are not particularly limited.

Examples of the solvent for the above adhesive composition and colorant include acelin, methyl ethyl ketone, methyl isobutyl ketone, ncrohexane, ethyl acetate, butyl acetate, doluol, quinrole, and the like.

In addition, ``Secure 2: 11 film layer and/or barrier adhesive''
The XI agent layer may be optionally treated with a matte finish to prevent the reflection of the film, or may contain antioxidants, stabilizers, ultraviolet absorbers, antiblocking agents, antistatic agents, etc. It is also possible to mix the following ingredients.

As a matting agent, the particle size is 10μIl+ or less]! ■ Age-based powders (eg, hydrated silica) can be mentioned. The blending amount of the matting agent is determined by (jf 1
11'? It is preferable to add in an amount of 0.5 to 5 parts by weight per 100 parts by weight of the solid content.

The antistatic agent is not limited as long as it can be dissolved in the adhesive composition, and cationic antistatic agents are preferred for q and y. Examples of the antistatic agent include alkylyl (about 8 to 24 carbon atoms) ami-7probylnomethylhydroxyethylammonium, 7-alkylamine salts, and quaternary ammonium salts (such as N , N , N
, Ntetraalkyl, and at least one of the alkyl groups has about 8 to 24 carbon atoms, and the remaining ones have about 1 to 5 carbon atoms. ) etc. are exemplified.

)J''? The amount of anti-static cutting may be sufficient as long as it is sufficient to prevent the generation of electricity. The amount is preferably 1 to 10 parts by weight.

In addition, the compounding ratio of the pond compounding agent is 0.1 to 5 parts by weight based on 100 parts by weight of the solid content of the protective film layer or the adhesive composition.
It is preferable that the weight be ff1s.

(e) Function The re-adhesive masking film of the present invention has both the base film Ml and the H-retention film layer made of polyester film, so it has the dimensional stability, heat resistance and +91 mechanical properties required for the masking film. etc. each 1,?
Moreover, since the release layer formed on the protective film R4 is made of a long-chain alkyl-based reactive copolymer, the base film layer and the protective film R4 have excellent properties. It has a moderate anchoring effect and peeling effect; in other words, the peelability is not so great, and as a result, it has the effect of preventing floating on the cut surface when creating a predetermined design.

In addition, the light-shielding adhesive layer that adheres to the protective film layer is flexible and can be repeatedly attached to the base film layer, so that the base film layer can be masked many times, or silk screened or photographed. It has the effect of being pasted over and over again.

Further, in the re-adhesive masking film of the present invention, when the protective film layer formed with the light-shielding adhesive layer is peeled off from the base film layer, the dye contained in the light-shielding adhesive layer is transferred to the base film R4. 'I don't do it. Although the reason for this is not clear, it is assumed that there is no affinity between the base film layer (polyester film) and the dyest, and as a result, the dye is difficult to transfer to the base film layer.

(') Examples The present invention will be described in detail below with reference to Examples, but the present invention is not limited thereto.

Example 1 An acrylic rubber having a molecular weight (,') of 600,000 (several average molecular weight) consisting of 85 parts by weight of butyl acrylate, 14 parts by weight of acrylonitrile, and 1 weight of 2-hydroquinethyl methacrylate as an adhesive composition. This was dissolved in methyl ethyl ketone so that the solid content concentration was 10%.

In this adhesive composition solution, 8 parts by weight of Spiron Orange 2 R11 (manufactured by Hodogaya Chemical Industry Co., Ltd.), which is a light-shielding dye, and dodecaloylaminium 7-probylnomethyl-2'-hydroxyethylammonium 4, which is a cationic antistatic agent, are added. Mix parts by weight and stir optically until a homogeneous solution is obtained.
Next, the solution was diluted with methyl ethyl ketone so that the solid content concentration was 6.0% by weight to obtain a light-shielding coating solution. The solution had a viscosity of 900 centivoise at a temperature of 23°C.

+J 7 The ilm layer (2) is transparent and has a critical surface tension of 43 dync! :/cu, 17sa25μ[n
Using a two-thin stretched polyethylene terephthalate film (polyester film), apply the above coating solution to one side with a roll coater, and after drying, the coating film has a 117 diameter of 10μIn.
It was coated and dried at a temperature of 100 to 110"C for 5 minutes.

In this way, a uniform adhesive scraping layer (3) was previously formed on the Li film layer (2).

Next, as the substantially transparent base film layer (4), lll! 1 when the interfacial tension is 35 dynes/can
A colorless and transparent polyethylene terephthalate film (polyester film) with a 7510 () μI of 11 was used, and a long chain alkyl hinyl ether consisting of octadecyl vinyl ether (A> and acrylic Pjl (B)) was coated on the base film/[(4). Combine ((,\) and (B
) in which the molar ratio of The re-adhesive masking film (1) of the present invention was obtained by laminating it on the exposed surface side of the light-shielding adhesive layer (3).

Comparative Example The same light-shielding coating solution as in Example 1 was used,
Transparent as a protective film layer with a critical surface tension of 31 dy
Using a polypropylene film made of neS/cIn and having a thickness of 25 μII+, the same light-shielding coating solution as in Example 1 was applied to one side of the protective film layer using a roll coater so that the coating thickness after drying would be 10 μm. Apply to temperature 100
Drying was performed at ~110'C for 5 minutes.

In this way, a light-shielding adhesive layer was formed on the protective film layer.

Next, the colorless and transparent base film layer has a thickness of 60 μm.
m polypropylene film was used.

On the other hand, a platinum catalyst (trade name PL-3: Shin-Etsu Ka"7) was added to 100 parts by weight of a 30% by weight toluene solution of addition-polymerized trimethylpolysiloxane, which is a known release layer.
) Add 1 part by weight, stir until homogeneous,
After mixing, dilute with toluene until the solids concentration is 3% by weight.

Apply the solution of the release layer on one side of the base film layer using a kiss coater, and after drying (solid content) the amount of peeling is 0.
It was coated uniformly at a concentration of 1 g/l112 and dried at a temperature of 100 to 110°C for 5 minutes.

On the release-treated side of this base film layer, "2Kiho 2!"
The light-shielding adhesive layer side of the film layer was bonded together to obtain a masking film similar to a commercially available product.

Example 2 Adhesive composition: 90 parts by weight of acrylic rubber with a molecular weight of approximately 600,000, consisting of 85 parts by weight of butyl acrylate, 14 parts by weight of acrylonitrile, and 1 part by weight of 2-hyroquinethyl methacrylate, and 90 parts by weight of vinyl chloride. and 10 parts by weight of vinyl acetate (average degree of polymerization 750).
) was completely dissolved in methyl ethyl ketone with a solid content concentration of 10 wt. 8 parts by weight (manufactured by Kogyo Co., Ltd.) were blended and mixed uniformly.

What is the gloss per 100 parts by weight of the solid content of the light-shielding adhesive 411 composition solution thus obtained? A light-shielding coating solution was obtained by mixing 1 part by weight of water-containing silicon dioxide (silicon oxide content: 97% by weight, 9f or more) with an average particle size of 4 μm or less.

Next, commercially available silicone-treated release paper P, r
The above light-shielding coating solution is applied to the separated surface of I so that the film 17 after drying is 1
It was coated with a roll coater to give a thickness of 5 μII+ and dried at a temperature of 100 to 110° C. for 5 minutes, thereby forming a light-shielding adhesive layer (3) on the release paper.

In addition, the protective film layer (2) is transparent and has a thickness of 50 μm.
+d protective film layer (2) using II+ polybutylene tele7 tallate film (polyester film)
The light-shielding adhesive layer (3) was pressure-bonded and transferred onto one side of the protective film KJ (2), thereby forming a light-shielding adhesive layer (3) on one side of the protective film KJ (2).

On the other hand, as the substantially colorless and transparent base film/1 (4), a colorless and transparent polybutylene terephthalate film with a thickness of 100 μin was used, and the base film layer (
・1)-Ni, octadecyl methacrylate (A) and 7
4r consisting of crylonitrile (B) [alkyl acrylate copolymer (the molar ratio of (A) and (13) is 11 and 9
) A solution is applied and dried to form a release WJ (S), and the release layer (5) side of the base film layer (t) is coated with Y in the protective film (2) with the light-shielding adhesive layer (3).
1 The re-adhesive masking film (1) of the present invention was obtained by laminating it with the light-shielding adhesive layer (3) side.

Table 1 shows the characteristic results of the three examples and comparative examples.

(Margin below) From Table 1, it is clear that the masking film of the present invention does not cause any lifting when cut, and after peeling off the protective film layer.
It is recognized that the light-shielding adhesive layer does not remain on the base film layer and has excellent characteristics compared to the comparative examples, such as having re-adhesive properties.

(B) Effects of the Invention The re-adhesive masking film of the present invention has dimensional stability, heat resistance (no curling), and mechanical properties since both the base film layer and the protective film are made of polyester film. etc.? It has excellent S14 properties,
The ♀1j release layer on the protective film layer is formed with a release layer made of a long-chain alkyl-based reactive copolymer, and the release layer has a moderate anchoring effect on the base film layer and the protective film layer. Because it has a peeling effect, there is almost no lifting of the base film when making cuts in the protective film layer with a cutter knife, etc., and as a result, it is possible to perform precise photolithography. be.

Furthermore, the re-adhesive masking film of the present invention has excellent effects such as no light-shielding adhesive layer remaining on the base film layer when the protective film layer is peeled off from the base film layer.

Furthermore, after peeling off the protective film layer, the re-adhesive masking film of the present invention can be pasted on the base film layer again, or pasted on a silk screen or page plate several times. As a result, it is easy to handle and extremely useful.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of the main part of the masking film of the present invention. (1)... Re-adhesive masking film, (2)...
・Holding: A film layer, (3)...Light-shielding adhesive J sound,
(4)...Base film layer, (5)...All
R.M. Patent Applicant fr Kokagaku Kogyo Co., Ltd. Figure 1 1-j) Mail 1 square A canvas film A 2--44 leaf film layer 3--Layer IL conquest 1 agent layer 4--To... Film door 1 5-J yen #fake

Claims (2)

[Claims] (1) A masking film formed by sequentially laminating a substantially transparent base film layer, a release layer, a light-shielding adhesive layer, and a protective film layer, wherein both the base film layer and the protective film layer are made of polyester film. form,
A re-adhesive masking film characterized in that the above-mentioned release layer is formed of a long-chain alkyl copolymer. (2) The re-adhesive masking film according to claim 1, wherein the polyester film is a polyethylene terephthalate film or a polybutylene terephthalate film.