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Adhesive sheet

An adhesive sheet and bonding technology, applied in the direction of adhesives, pressure-sensitive films/sheets, film/sheet-like adhesives, etc. problem, to achieve the effect of excellent exhaust

Inactive Publication Date: 2007-04-11
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the adhesive sheets disclosed in Patent Document 1 and Patent Document 2, only the head end of the small protrusion of the adhesive layer is bonded to the adherend, so the adhesive force is weak. It is easy to intrude water, chemicals, etc. between the bonding layer and the adherend, and there will be a problem that the adhesive force will be further reduced.
Even when such an adhesive sheet is strongly pressed against the adherend, the adhesive force will be insufficient due to the influence of the small protrusions of the adhesive layer.
In addition, in this case, since a gap communicating with the outside is buried, it is impossible to prevent air bubbles that are generated when gas is generated from the adherend.
[0010] In addition, when the adhesive sheet is exposed to a high temperature after being attached to an adherend, the small protrusions disappear due to the flow of the adhesive layer, so after exposure to a high temperature, residual air pockets or If the fitting with the recessed part of the adherend is insufficient, or if air bubbles are generated, air or gas cannot be discharged to the outside, and air pockets or air bubbles cannot be removed or prevented.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]The peeling surface of a release material (manufactured by Lintec Corporation, FPM-11, thickness: 175 μm) that laminated wood-free paper on both sides with polyethylene resin and coated with a silicone-based release agent on one side Above, a coating agent of an acrylic solvent-based adhesive (manufactured by Lintec, MF) was applied with a knife coater so that the thickness after drying was 30 μm, and dried at 90° C. for 1 minute. A black opaque substrate (thickness: 100 μm) made of polyvinyl chloride resin was pressure-bonded to the adhesive layer thus formed to obtain a laminate having a three-layer structure.

[0065] Peel off the release material from the laminate, and irradiate the laminate with CO from the adhesive layer side. 2 Laser, 2,500 pcs / 100cm 2 The pore density of 1.00000000000000000000000000000000 formed through-holes with a pore diameter of about 50 μm in the substrate surface and a pore diameter of about 90 μm in the bonding surface. Thereafter, the p...

Embodiment 2

[0068] In addition to replacing CO 2 The laser was irradiated with a UV-YAG laser, and an adhesive sheet was produced in the same manner as in Example 1, except that the through-hole diameter on the substrate surface was about 30 μm, and the hole diameter on the adhesive surface was about 45 μm. Thereafter, the storage modulus and loss tangent of the adhesive layer of the obtained adhesive sheet were measured in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3

[0070] In addition to using an acrylic solvent-based adhesive (manufactured by LINTEC, PK) as an adhesive, and setting the pore diameter on the substrate surface of the through hole to about 30 μm, and the pore diameter on the bonding surface to about 80 μm, An adhesive sheet was produced in the same manner as in Example 1. Thereafter, the storage modulus and loss tangent of the adhesive layer of the obtained adhesive sheet were measured in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

The present invention provides an adhesive sheet in which a plurality of through holes (2) penetrating from one surface to the other are formed in an adhesive sheet (1) provided with a base material (11) and an adhesive layer (12). The diameter of the through holes (2) is set at 0.1-300 μm, and the hole density is set at 30-50,000 / 100 cm2. In addition, the storage modulus of the adhesive layer (12) at Tmax (the highest temperature that can be exposed after being attached to the adherend) is greater than or equal to 4.5×103Pa, and the adhesive layer (12) is at Tmax The loss tangent under is less than or equal to 0.78. The adhesive sheet (1) can prevent or remove air pockets or air bubbles while ensuring sufficient adhesive force without impairing the appearance. In addition, even if it is exposed to high temperature after being attached to the adherend, the Gas is also excellent.

Description

technical field [0001] The present invention relates to an adhesive sheet capable of preventing or removing air traps or blisters. Background technique [0002] When the adhesive sheet is attached to the adherend by hand, air pockets are generated between the adherend and the bonding surface, impairing the appearance of the adhesive sheet. Such air pockets tend to occur particularly when the area of ​​the adhesive sheet is large. [0003] In order to eliminate the problem of the appearance of the adhesive sheet caused by air pockets, the operation of replacing the adhesive sheet with another adhesive sheet, the operation of peeling off the adhesive sheet at one time and reattaching it, or the swelling of the adhesive sheet The operation of partly opening a hole with a needle to expel air. However, in the case of replacing the adhesive sheet, not only labor and cost are required, but also in the case of reattaching the adhesive sheet, damage to the adhesive sheet, wrinkles ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/20
CPCC09J2201/20C09J2201/622Y10T428/24273C09J7/02C09J7/20C09J2301/18C09J2301/312C09J7/38
Inventor 加藤挥一郎津田和央金泽治
Owner LINTEC CORP
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