JPH04305650A - Light-shielding masking film - Google Patents

Abstract

PURPOSE:To make peeling and removing of a light-shielding peelable film easier than a conventional film, and moreover, to enable sticking of the light-shielding film once peeled to the supporting body film or other photographic material. CONSTITUTION:The masking film is formed by laminating a light-shielding peelable film 4 and a transparent or translucent supporting film 3. The light- shielding peelable film 4 consists of a transparent or translucent plastic film 1 coated with a light-shielding repeelable adhesive 2. More preferably, a polyolefin resin is laminated on the sticking surface of the supporting film 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding masking film used in photolithography for printing.

0002

[Prior Art] Light-shielding masking films used in photolithography are usually made by coating a support film with a mixture of light-shielding dyes, nitrile rubber, and nitrified cotton to form a light-shielding release film. The light-shielding release film is designed to be easily peelable from the support film.

[0003] Then, a necessary part of this light-shielding peeling film is cut with a knife or the like, and the cut part is peeled off to form a transparent part, which is used in photolithography.

[0004] Therefore, it is necessary to freely form the transparent portion and the light-shielding portion, and it has been desired that the light-shielding peeling film that has been peeled off can be reapplied even in the case of correction or other purposes.

[0005]

[Problems to be Solved by the Invention] However, since the light-shielding masking films conventionally used are made of nitrified cotton or the like, they have no adhesive properties and cannot be reapplied.

[0006] Further, attempts have been made to develop light-shielding film materials and make them sticky, but these have the drawbacks of complicated manufacturing methods, formulations, etc., and the inability to maintain stable viscosity.

[0007] The present invention is a light-shielding film that is easier to work with than conventional products even in the general usage method (peeling and removal), and allows the once-peeled light-shielding peeling film to be easily applied to other locations. The purpose of the present invention is to provide a sexual masking film.

[0008]

[Means for Solving the Problems] The present invention provides a light-shielding release film in which a removable adhesive containing a light-shielding dye or pigment is applied to a transparent or translucent plastic film;
It is made by laminating a transparent or translucent support film.

At this time, it is preferable to laminate a polyolefin resin on the bonding surface of the support film.

0010

[Operation] A cut is made in the necessary part of the light-shielding release film with a knife, etc., and that part is peeled off to form a transparent part of the support film, which is superimposed on the object to be photographed and used for photolithography.

[0011] The adhesive-coated side of the light-shielding release film that has been peeled off is attached to an object to be photographed corresponding to the transparent portion, and used for photolithography.

0012

[Example] The light-shielding masking film according to the present invention is
As shown in the enlarged sectional view of the main part of FIG. 1, 1 is a plastic film, which is a transparent or translucent product such as polyethylene terephthalate or stretched polypropylene, and preferably has a thickness of about 10 to 50 microns.

Reference numeral 4 is a light-shielding release film, in which a removable adhesive 2 is applied to the film 1, dried, and then bonded to another release film (not shown) to undergo a curing reaction. Thereafter, the latter release film was peeled off.

The removable adhesive 2 is a crosslinked acrylic adhesive mixed with a light-shielding dye and pigment.

[0015] The above-mentioned acrylic cross-linked pressure-sensitive adhesive mainly contains butyl acrylate, 2-ethylhexyl, etc., and toluene diisocyanate or hexane diisocyanate is added to a solvent solution obtained by copolymerizing this with a polymerizable monomer having carboxylic acid and a hydroxyl group. It is obtained by mixing methylene diisocyanate (another crosslinking agent) and coating and drying, and products corresponding to this are commercially available from adhesive manufacturers.

Next, 3 is a support film. Polyethylene terephthalate is preferred, with a thickness of about 25 to
The diameter shall be 250 microns. Alternatively, it is preferably a polyester film laminated with polyolefin on the bonding surface, with a total thickness of about 25 to 250 microns.

[0017] However, after the above-mentioned curing reaction, (
By laminating the light-shielding release film 4 (from which another release film (not shown) has been removed) to the support film 3,
A masking film of the invention (as shown in Figure 1) is obtained.

[0018] Furthermore, the adhesive of the removable adhesive 2 is
It is also preferable to use an adhesive that exhibits removability immediately after application and drying (without a curing reaction). If such an adhesive is used, it can be laminated to the support film 3 immediately after coating and drying by simply mixing the light-shielding dye and pigment.

As described above, an adhesive that exhibits removability immediately after application and drying can be obtained by blending a metal chelating agent into an acrylic adhesive copolymerized with carboxylic acid.

Experimental examples according to the present invention are shown below.

Olivine BPS-4089 (manufactured by Toyo Ink Manufacturing Co., Ltd.) 100 parts by weight and Olivine BHS-4089
100 parts by weight of adhesive R-4150 (Nichiei Kako formulation) blended with 2 parts by weight of B (same), 8 parts by weight of Spiron Red (manufactured by Hodogaya Chemical), and 1 part by weight of Spiron Orange (same). A removable adhesive 2 was prepared.

The above-mentioned removable adhesive 2 was coated on a polyester film 1 having a thickness of 25 microns to a solid content of 20 microns and dried.

[0023] Next, another release film was attached and the temperature was set to 4.
After carrying out a curing reaction at 0° C. for 48 hours, the release film was peeled off to obtain a light-shielding release film 4 with a thickness of 45 microns.

[0024] Then, the light-shielding peeling film 4 and a polyester support film 3 having a thickness of 75 microns were laminated together.
A red light-shielding masking film was obtained.

When the light transmittance of this film was measured,
It had a light-shielding property that did not allow light rays of 360 to 560 nanometers to pass through.

Further, when a cut line was made in the polyester film 1, the light-shielding peeling film 4 could be easily peeled off as shown in FIG. 1, and reapplying was also good and easy.

Next, another experimental example according to the present invention will be shown.

[0028] An adhesive containing 100 parts by weight of Nissetsu PE-121 (manufactured by Nippon Carbide Industries) and 5 parts by weight of Nissetsu CK-401 (the same); 100 parts by weight of BM-330 (blended by Nichiei Kako); A removable adhesive 2 was prepared by blending 8 parts by weight of Spiron Orange (manufactured by Tsuchiya Chemical Co., Ltd.) and 1 part by weight of Spiron Orange (manufactured by Tsuchiya Chemical Co., Ltd.).

The removable adhesive 2 described above was applied to a translucent polypropylene film 1 with a thickness of 40 microns to a solid content of 20 microns, and dried at a temperature of 80° C. for 1 minute to a film of 60 microns in thickness. A light-shielding peeling film 4 was obtained.

Immediately after drying, the above-mentioned light-shielding release film 4 is laminated onto a support film 3 having a total thickness of 50 microns, in which polypropylene is laminated to a thickness of 25 microns on the surface to which the polyester film is laminated. A masking film was obtained.

When the light transmittance of this film was measured,
It had a light shielding property that did not transmit light rays of 360 to 560 nanometers.

Further, when a cut line was made in the polypropylene film 1, the light-shielding peeling film 4 could be easily peeled off and re-applying was also easy.

[0033]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

Since the light-shielding removable adhesive 2 is applied to the plastic film 1 of 10 to 50 microns to form the light-shielding peeling film 4, the strength of the film is high and The peelability and reapplicability can be handled on the same level as general adhesive stickers.

[0035] Furthermore, handling is much easier than with the adhesive film forming method.

The adhesive of the removable adhesive 2 has a large degree of freedom depending on the monomer composition and crosslinking system of the adhesive, so it can be used in a range of adhesives from extremely weak to extremely strong.

[0037]Also, recently it has been preferred to make the surface of the light-shielding peeling film 4 matte, but this can be solved by making the film 1 a matte product.

Furthermore, even if a cut line is made in a place other than the required pattern on the light-shielding peeling film 4, the removable adhesive 2 restores its original shape, making it difficult for light to pass through.

Further, by laminating a polyolefin such as polypropylene or polyethylene on the bonding surface of the support film 3, the peelability of the light-shielding peeling film 4 can be further improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a partially peeled state of the present invention.

[Explanation of symbols]

1 Film 2.Removable adhesive 3 Support film 4 Light-shielding peeling film

Claims (2)

[Claims] 1. A light-shielding release film 4 comprising a transparent or translucent plastic film 1 coated with a removable adhesive 2 containing a light-shielding dye or pigment, and a transparent or translucent support film 3. A light-shielding masking film made by laminating and. 2. The light-shielding masking film according to claim 1, wherein a polyolefin resin is laminated on the bonding surface of the support film 3.