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Adhesive sheet and method for manaufacturing same

a technology of adhesive sheets and adhesive sheets, applied in the field of adhesive sheets, can solve the problems of increasing costs, disfiguring pressure sensitive adhesive sheets in some cases, damage to pressure sensitive adhesive sheets, etc., and achieve the effect of preventing or removing air trapping or blisters

Inactive Publication Date: 2006-10-05
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] According to the pressure sensitive adhesive sheet of the above invention (invention 1), air between the adherend and the adhesive face is deflated to the outside of the surface of the pressure sensitive adhesive sheet via the through holes, thus air is hardly caught when sticking the pressure sensitive adhesive sheet on the adherend. Therefore, an air trapping can be prevented. Even though air is caught and an air trapping is formed, the air trapping can be eliminated by pressing an air trapping part or the vicinity of an air trapping part (including the air trapping part) to deflate air to the outside of the surface of the pressure sensitive adhesive sheet via the through holes. Furthermore, even when gas is generated from the adherend after sticking the pressure sensitive adhesive sheet on the adherend, gas is deflated to the outside of the surface of the pressure sensitive adhesive sheet via the through holes. Therefore, a blister can be prevented.
[0026] As described above, according to the present invention, a pressure sensitive adhesive sheet capable of preventing or removing an air trapping or a blister can be obtained without disfiguring the pressure sensitive adhesive sheet, while securing a sufficient adhesive strength.

Problems solved by technology

When manually sticking a pressure sensitive adhesive sheet on an adherend, there has been a problem that an air trapping can be formed between the adherend and the adhesive face so that the pressure sensitive adhesive sheet is disfigured in some cases.
However, the following problems have often occurred.
For example, when replacing the pressure sensitive adhesive sheet, it is not only troublesome, but also causes an increase in the cost.
In addition, when attaching the pressure sensitive adhesive sheet again, the pressure sensitive adhesive sheet may be damaged, wrinkles may be generated on the surface, or the pressure sensitive adhesive properties may be deteriorated.
However, when large-size pressure sensitive adhesive sheets such as a glass shatterproof film for windows, a decorative film, a marking film or the like are stuck, much time and much effort are required.
However, sticking by apparatus cannot always be applied depending on uses of the pressure sensitive adhesive sheet or portion and / or shape of the adherend.
When a pressure sensitive adhesive sheet is stuck to the adherend made from such a resin material, the gas generated from the adherend causes a blister in the pressure sensitive adhesive sheet.
However, on the pressure sensitive adhesive sheet disclosed in the above gazettes, there have been problems that an adhesive strength is poor because only the tip of the small projections in the pressure sensitive adhesive layer is bonded to the adherend, and water, chemicals or the like can easily be infiltrated between the pressure sensitive adhesive layer and the adherend, thus lowering an adhesive strength moreover.
Even though such an adhesive sheet is strongly pressed to the adherend, an adhesive strength is not strong enough due to the small projections of the pressure sensitive adhesive layer.
Furthermore, in that cases, the gap leading to the outside is filled up, therefore a blister cannot be prevented, which is formed while gas is generated from the adherend.

Method used

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  • Adhesive sheet and method for manaufacturing same
  • Adhesive sheet and method for manaufacturing same
  • Adhesive sheet and method for manaufacturing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] 25 parts by weight of ethyl acetate was added to 100 parts by weight of acrylic type pressure sensitive adhesive agent (Coponyl N-2147 manufactured by Nippon Synthetic Chemical Industry Co., Ltd., solid content: 35 weight %), and then 1 part by weight of an isocynate type crosslinking agent (Colonate L manufactured by Nippon Polyurethane Industry Co., Ltd.) was added to them. The mixture was sufficiently agitated to obtain a coating agent of a pressure sensitive adhesive agent.

[0084] A release material (FPM-11 manufactured by Lintec Corporation, thickness: 175 μm) was produced by laminating a polyethylene on both faces of a woodfree paper and coating a silicone type release agent on one face. The coating agent of the pressure sensitive adhesive agent was coated with a knife coater on the release surface of the release material so as to reach a thickness of 30 μm following drying, and the coating agent of the pressure sensitive adhesive agent was dried for one minute at 90° C...

example 2

[0086] A pressure sensitive adhesive sheet was produced in a similar manner to the Example 1, except that the hole diameter of the through holes at the surface of the base material was 40 to 50 μm and the hole density was 4,900 / 100 cm2.

example 3

[0087] A laminate of a 3-layers structure was obtained in a similar manner to the Example 1, except that as for a base material, a transparent polyethylene terephthalate film (Lumirror T60 manufactured by Toray Inc., thickness: 50 μm) was used instead of polyvinyl chloride and as for a release material, a polyethylene terephthalate film coated with a silicone type release agent on one side (PET7511 manufactured by Lintec Corporation, thickness: 75 μm) was used.

[0088] An Excimer laser was radiated to the obtained laminate from the side of the release material so that through holes having a hole diameter of 0.5 to 10 μm at the surface of the base material and a hole diameter of 20 to 30 μm at the adhesive face (the hole diameter at the adhesive face is the maximum diameter in the base material and the pressure sensitive adhesive layer) were formed with a hole density of 10,000 / 100 cm2, thus a pressure sensitive adhesive sheet was produced.

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Abstract

The present invention relates to a pressure sensitive adhesive sheet 1 comprising a base material 11 and a pressure sensitive adhesive layer 12 wherein a plurality of through holes 2 passing through one face of the pressure sensitive adhesive sheet 1 to the other face are formed. The hole diameter of the through holes 2 is 0.1 to 300 μm and the hole density is 30 to 50,000 / 100 cm2. It is preferable to form the through holes 2 using a laser beam machining. According the pressure sensitive adhesive sheet 1, an air trapping or a blister can be prevented or removed without disfiguring the pressure sensitive adhesive sheet and while securing a sufficient adhesive strength.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure sensitive adhesive sheet capable of preventing or removing an air trapping or a blister and a method for production of such a pressure sensitive adhesive sheet. BACKGROUND ART [0002] When manually sticking a pressure sensitive adhesive sheet on an adherend, there has been a problem that an air trapping can be formed between the adherend and the adhesive face so that the pressure sensitive adhesive sheet is disfigured in some cases. This air trapping is likely to occur more often when the area of the pressure sensitive adhesive sheet is large. [0003] In order to solve the problem in the appearance of the pressure sensitive adhesive sheet due to the air trapping, it has been performed that a pressure sensitive adhesive sheet is replaced by the other pressure sensitive adhesive sheet, a pressure sensitive adhesive sheet is removed and attached again, or a hole is formed using a needle in the expanded portion of the pres...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B37/00B32B3/10C09J7/20C09J7/38
CPCC09J7/02Y10T428/24273Y10T156/1056C09J2201/20C09J7/20C09J2301/18B23K26/384
Inventor KATO, KIICHIROKATO, KAZUYATAKEMOTO, TAKASHI
Owner LINTEC CORP