JP2866386B2 - Shading masking film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In the present invention, in photoengraving, a desired pattern is cut, unnecessary portions are peeled and removed, and a mask plate or a negative or positive plate is prepared. The present invention relates to a light-shielding masking film used for forming a mask.

[Problems to be solved by the prior art and the invention] Conventionally, a light-shielding masking film used in photoengraving is obtained by directly providing (a) a light-shielding release layer on a transparent support made of a PVC sheet, a polyester film, or the like. And (b) those provided with a light-shielding release layer via an adhesive. When these light-shielding masking films are cut into a desired pattern, and unnecessary portions are peeled off to produce a block, cutting from hand cutting to automatic plotting with the spread of automatic plotting has become mainstream. Came. The automatic plotting apparatus has made it possible to produce an underlay efficiently and with high accuracy, but with this, a high quality of the light shielding masking film itself has been required. Conventionally, (a) a light-shielding release layer directly laminated on a support has a cut edge formed by a cutting blade.
There was a drawback that it opened about 0.5 mm or more. This was due to the fact that the stress at the cutting edge acts directly on the coating, resulting in residual strain and opening of the cutting line. In this development, not only in the cutting with the automatic plotting apparatus but also in the hand cutting, the opening of the cut portion where the overrun occurs is exposed at the time of printing.
Alternatively, there is a drawback such that it is not possible to completely match when removing the hair. (B) In the case where the light-shielding release layer was laminated on the support via the pressure-sensitive adhesive, the opening at the cut portion was slightly reduced by the presence of the pressure-sensitive adhesive layer, but the cut line was not completely closed. Immediately after cutting, it opened over time, even if it was closed. Further, since the light-shielding release layer using the pressure-sensitive adhesive was mainly composed of castor oil, cellulose and the like as a resin composition, the film strength was weak and the film was cut several times during the peeling operation. The peeling work to remove unnecessary parts is performed by lifting the edge of the coating of the unnecessary parts with a knife or a peeler, etc. manually, even if cutting is performed using an automatic plotter. Work efficiency was poor. In addition, if the film breaks in the middle, it is necessary to lift up the end of the unnecessary film with a repeated knife or peeler and peel it off, and the pick-up property is also poor, possibly damaging the support and impairing the photographic suitability in many cases. there were.

The present invention provides a light-shielding layer having a strong light-shielding release layer that can be continuously cut off without being cut off in the middle of the cut line of the cutting line immediately after cutting, and does not open over time, and also during peeling of an unnecessary portion of the film. An object of the present invention is to provide a light-shielding masking film which is suitable for producing a complex masking film and for creating a complicated pattern such as a map plate, a graphic arts, or a printed circuit board for a silk screen printing plate.

[Means for Solving the Problems] The light-shielding masking film of the present invention is provided with an adhesive layer on a plastic film support, and an ethylene-vinyl acetate copolymer resin, nitrocellulose,
A light-shielding release layer containing a light-shielding colorant, a plasticizer, and an antistatic agent is provided. The plasticity comprises an external plasticizer and / or an internal plasticizer, and the external plasticizer is a fatty acid ester, an epoxidized oil, an epoxy fatty acid ester, a phthalate ester, an adipate ester, or a polyester. Vinyl resin, vinyl chloride-vinyl acetate copolymer resin, vinylidene chloride resin, styrene resin, styrenated vinyl resin, chlorosulfonated resin,
A urethane resin and a urethane elastomer, wherein one or two of the external plasticizer and / or the internal plasticizer
Consists of more than species.

The light-shielding masking film of the present invention is provided with a light-shielding release layer that matches well with the pressure-sensitive adhesive layer, so that when the light-shielding release layer is cut, the cutting line is completely closed without opening, and further unnecessary coating is achieved. When light is peeled off, a light-shielding release layer having such a strength that it can be peeled off as a continuous film without being cut off is provided. The addition of an antistatic agent has the effect of preventing adhesion of dust and dust during the work of the light-shielding release layer due to triboelectric charging, and the effect of preventing vacuuming by a vacuum printer and adsorption by static electricity.

The present invention will be described in more detail. The plastic film support in the present invention may be any one which is usually used for a masking film support. Polyesters such as polyethylene terephthalate, polybutylene phthalate, polyoxybenzoate, polycarbonate,
Although a polyvinyl chloride film or the like can be used, a transparent polyethylene terephthalate film having little expansion and contraction is particularly preferable. The thickness of the film is 25-750μ, especially 50-250μ
Is suitable.

As the pressure-sensitive adhesive layer provided on the plastic film support, synthetic resin-based and rubber-based pressure-sensitive adhesives can be used. Acrylic ester copolymers, saturated polyester copolymers, polyurethanes and the like can be used as the synthetic resin system, and natural rubber, chloroprene rubber, neoprene rubber, nitrile rubber, styrene-isoprene rubber and the like can be used as the rubber system. Ethylene-vinyl acetate copolymer resin, which is a component of the light-shielding release layer, and natural rubber having good adhesion to nitrocellulose can be suitably used. Mixtures of natural rubber with other synthetic resins and / or rubbers are also suitable. The film thickness is 0.2-50μ
Can be used. When the film thickness is 0.2 μm or less, the adhesiveness cannot be maintained, and the light-shielding release layer may be opened by cutting. Further, when the film thickness is 50 μm or more, when unnecessary light-shielding peeling is peeled off after cutting, stringing of the pressure-sensitive adhesive layer or protrusion of the pressure-sensitive adhesive at the cut edge occurs, which impairs photographic suitability. The thickness is particularly preferably from 0.6 to 5 μm.

The light-shielding release layer of the present invention provided on the pressure-sensitive adhesive layer,
(A) ethylene-vinyl acetate copolymer resin, (b) nitrocellulose, (c) light-shielding colorant, (d) plasticizer,
(E) It contains an antistatic agent.

(A) As the ethylene-vinyl acetate copolymer (hereinafter referred to as EVA), those having an acetic acid content of 10 to 95% by weight based on the amount of ethylene can be used, and those having an acetic acid content of 20 to 70% by weight are particularly preferable. .

(B) Nitrocellulose is compatible with EVA, and when used with EVA, increases the strength of the coating and affects how the coating is closed during cutting, and plays an important role in adhesion to the adhesive layer. Nitrocellulose has a nitrogen content of 10.7
Up to 12.2 wt% can be used, but JISK6703-1964,
Using a nitrocellulose solution based on ASTMD301-72, ASTM D1343-74, dry sample nitrocellulose 12.2
Nitrocellulose with a viscosity of 15% to 20.0 seconds containing wt%, dried sample
A nitrocellulose solution having a viscosity of 3.0 to 9.0 seconds containing 20.0 wt% and a viscosity of 4.0 to 12.2 seconds containing 25.0 wt% of a dried sample nitrocellulose is preferably used.

(C) The light-shielding colorant may be a commonly used one, but basically, it is sufficient to shield the photosensitive wavelength region of the target photosensitive material from light. For example, yellow is preferred for a diazo photosensitive material, orange for an ortho photosensitive material, and red is preferred in consideration of multiple exposure. For panchromatic light-sensitive materials, pigments such as aluminum and carbon are preferable instead of ordinary dyes.

(D) The shielding agent comprises an external plasticizer and an internal plasticizer. Specific examples of the external plasticizer include fatty acid esters such as dibutoxyethyl adipate and trioctyl trimellitate, epoxidized linseed oil, and epoxidized soybean oil. Epoxidized oils and fats, epoxy fatty acid esters such as epoxyhexahydrophthalic acid-2-ethylhexyl, bis (2-ethylhexyl) adipate, dibutyl phthalate, dioctyl phthalate (bis-2-ethylhexyl) phthalate,
Phthalates such as dioctyl phthalate and bis (2-ethylhexyl) terephthalate, DRAPEX411
(Trade name, Witco, USA), DRAPEX429 (trade name, Wit
co, USA) and DRAPEX P-1 (trade name, Witco, USA)
And DRAPEX409 (trade name, manufactured by Witco, USA). Particularly preferred are diethyl phthalate, dioctyl terephthalate, dioctyl phthalate, DRAPEX 409 and epoxidized linseed oil. One or more of these plasticizers are used.
Particular preference is given to combinations of diethyl phthalate with dioctyl phthalate and of dioctyl phthalate with epoxidized oils.

The internal plasticizer is added for the purpose of imparting elasticity to the light-shielding release layer to reduce internal stress generated when the coating is cut, and has an effect of preventing an opening at the time of cutting. Examples of the internal plasticizer include vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinylidene chloride resin, styrene resin, styrenated vinyl resin, chlorosulfonated resin, urethane rubber, and waxes (stearic acid type, carnauba wax type). , Bisamides), and one or two of these are added.

(E) An antistatic agent is added to prevent the generation of static electricity in the light-shielding release layer, and prevents dust and dust from adhering when the light-shielding release layer is peeled off to improve photographic performance. As the antistatic agent, a nonionic, anionic, or chaotic agent can be used. In the present invention, a quaternary ammonium, an acrylic resin (product number PQ50B, manufactured by Soken Chemical Co., Ltd.),
Polyoxy-8-stearate (trade name: MYRJ45, ICI Am
erica Inc., ATOMER (brand name, ICI America IN)
C., Inc.), Modified-N-alkyl-dimethylammonium salt, N-alkyldimethylbenzylammonium salt, N-alkyldimethylethylbenzylammonium salt (trade name, Staticide, ACL INC., Inc.) and the like are particularly preferable. It is.

These component ratios for forming the light-shielding release layer are usually (a) an ethylene-vinyl acetate copolymer resin and (b) a nitrocellulose weight ratio of (15:85) to (85:15),
Preferably it is (30:70)-(70:30). (C) The light-shielding colorant is based on 100 parts by weight of (a) ethylene-vinyl acetate copolymer resin and (b) nitrocellulose resin solid content.
0.1 to 50 parts by weight, preferably 3 to 10 parts by weight are suitable.
The plasticizer (d) is used in an amount of 0.1 to 50 parts by weight, preferably 0.5 to 25 parts by weight, per 100 parts by weight of the solid content of the (a) ethylene-vinyl acetate copolymer resin and (b) the nitrocellulose resin. (E) The antistatic agent is 0.01 to 30 parts by weight, preferably 0.03 parts by weight, based on 100 parts by weight of the resin solid content of (a) the ethylene-vinyl acetate copolymer resin and (b) nitrocellulose.
3 to 10 parts by weight are suitable.

[Example] An example of the present invention will be described below.

The components shown in Table 1 were mixed to form the pressure-sensitive adhesive, and pressure-sensitive adhesive coating solutions 1 and 2 were prepared.

The components shown in Table 2 were mixed to form a light-shielding release layer, and coating solutions 1, 2 and 3 for light-shielding release layers were prepared.

The light-shielding masking film of the present invention was prepared as described below using the following pressure-sensitive adhesive coating liquid and light-shielding release layer coating liquid, and the results shown in Table 3 were obtained.

(A) Polyethylene terephthalate film thickness 100μ
A solution of the pressure-sensitive adhesive coating solution 1 was applied thereon with a Meyer bar, and dried at 100 ° C. for 1 minute to obtain a pressure-sensitive adhesive layer. Further, a solution of the light-shielding release coating solution 1 is applied on the adhesive layer.
After drying at 6 ° C. for 6 minutes, a light-shielding release layer thickness of 32 μm was obtained. Table 3 shows the results
Shown in

(B) A solution of the pressure-sensitive adhesive coating solution 2 is applied on a polyethylene terephthalate film 125μ with a Mayer bar,
After drying at 100 ° C. for 1 minute, an adhesive layer was obtained. Further, a solution of the light-shielding release coating layer coating solution 1 was applied to the pressure-sensitive adhesive layer in the same manner as in (A), and dried at 120 ° C. for 6 minutes to obtain a light-shielding release layer having a thickness of 35 μm. Table 3 shows the results.

(C) A solution of the pressure-sensitive adhesive layer coating solution 1 was applied on a polyethylene terephthalate film having a thickness of 75 µm with a Mayer bar, and dried at 100 ° C for 1 minute to obtain a pressure-sensitive adhesive layer thickness of 2 µm. Further, a solution of the light-shielding release layer coating solution 2 was applied on the pressure-sensitive adhesive layer, and dried at 120 ° C. for 6 minutes to obtain a light-shielding release layer having a thickness of 30 μm.
Table 3 shows the results.

(D) Polyethylene terephthalate film thickness 188μ
A solution of the pressure-sensitive adhesive layer coating solution 2 was applied thereon with a Meyer bar, and dried at 100 ° C. for 1 minute to obtain a pressure-sensitive adhesive layer thickness of 1.0 μm. Further, a solution of the light-shielding release layer coating solution 2 was applied on the adhesive layer with a reverse coater and dried at 120 ° C. for 6 minutes to obtain a light-shielding release layer having a thickness of 40 μm. Table 3 shows the results.

(E) Polyethylene terephthalate film thickness 100μ
A solution of the pressure-sensitive adhesive layer coating solution 1 was applied thereon with a Meyer bar, and dried at 100 ° C. for 1 minute to obtain a pressure-sensitive adhesive layer having a thickness of about 1 μm. Further, a solution of the light-shielding release layer coating solution 3 was applied on the adhesive layer and dried at 120 ° C. for 6 minutes to obtain a light-shielding release layer having a thickness of 35 μm. Table 3 shows the results.

(F) Polyethylene terephthalate film thickness 100μ
The solution of the pressure-sensitive adhesive layer coating liquid 2 was applied thereon with a Meyer bar, and dried at 100 ° C. for 1 minute to obtain a pressure-sensitive adhesive layer thickness of 0.5 μm. Further, a solution of the light-shielding release layer coating solution 3 was applied onto the pressure-sensitive adhesive layer to obtain a light-shielding release layer having a thickness of 35 μm. Table 3 shows the results.

(G) <Comparative Example> A light-shielding release coating solution formulation directly on a polyethylene terephthalate film without an adhesive layer interposed therebetween,
The solution of No. 3 was applied and dried at 120 ° C. for 6 minutes to obtain a light-shielding release layer having a thickness of 35 μm. Table 3 shows the results.

From the above results, the light-shielding masking film of the present invention provided with the light-shielding release property via the pressure-sensitive adhesive layer has a good adhesive strength and a light plotter load even when cutting with an automatic plotter (WTID TA 30). Also, the pulling of the overrun due to the inertial force based on the acceleration of the plotter has been eliminated. Also, there was no opening in the cut, and the cutting line was closed after a lapse of time. In addition, the light-shielding release layer was peeled off as a continuous film because the light-shielding release layer had good pick-up and release properties. In addition, there is no adhesion of dust, dust, etc. due to triboelectric charging even in the reversing work based on normal photographic work, the vacuum in the printer at the time of printing is good, and it is very easy to remove from the printer after exposure. Was.

[Effects of the Invention] As described above, the light-shielding masking film of the present invention can be peeled off as a continuous film without the opening of the cutting line even when the cutting is performed by the automatic plotter, so that it can be peeled off in a short time. The processing is performed, and the efficiency is improved and the film is not damaged,
Further, since dust, dust and the like adhering at the time of peeling can be prevented, photographic properties can be greatly improved.

Continuation of front page (72) Inventor Shuji Koda 4-6-35 Suzuya, Yono-shi, Saitama Pref. Kimoto Central Research Laboratory Co., Ltd. (56) References JP-A-54-104902 (JP, A) JP-A-60-159854 (JP, A) JP-A-61-143758 (JP, A) JP-A-58-108537 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03F 1/00-1 / 06

Claims (4)

(57) [Claims] An adhesive layer is provided on a plastic film support, and a light-shielding layer containing an ethylene-vinyl acetate copolymer resin, nitrocellulose, a light-shielding colorant, a plasticizer and an antistatic agent is provided on the adhesive layer. A light-shielding masking film comprising a release layer. 2. The light-shielding masking film according to claim 1, wherein the weight ratio of the ethylene-vinyl acetate copolymer resin and nitrocellulose is in the range of 85:15 to 15:85. 3. The method according to claim 1, wherein the plasticizer is contained in an amount of 0.1 to 50 parts by weight based on 100 parts by weight of the resin solid content of the ethylene-vinyl acetate copolymer resin and nitrocellulose. The light-shielding masking film according to the above. 4. The plasticizer comprises an external plasticizer and / or an internal plasticizer, and the external plasticizer is selected from fatty acid esters, epoxidized oils and fats, epoxy fatty acid esters, phthalic acid esters, adipate esters and polyesters. One or more kinds of the internal plasticizers, wherein the internal plasticizer is a vinyl chloride resin, a vinyl chloride-vinyl acetate copolymer resin, a vinylidene chloride resin, a styrene resin, a styrenated vinyl resin, a chlorosulfonated resin, a urethane resin, and a urethane resin. 4. The light-shielding masking film according to claim 1, which is at least one member selected from elastomers.