Adhesive sheet and display body

A display and adhesive technology, applied in the direction of adhesives, adhesive types, electric solid devices, etc., can solve the problems such as the decline of step followability, the deterioration of processability, the reduction of the film strength of the adhesive layer, etc., to achieve anti-foaming properties. Excellent effect, excellent step followability, and good workability

Active Publication Date: 2021-11-09
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, if the adhesive layer is cured in order to improve the anti-foaming property, the step followability will decrease
[0009] In addition, when the storage modulus (G') of the adhesive layer is lowered as described above, the film strength of the adhesive layer decreases and the workability deteriorates.
For example, when the adhesive sheet is die-cut, etc., the adhesive overflows from the cut surface and causes the adhesive to adhere to the blade.

Method used

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  • Adhesive sheet and display body
  • Adhesive sheet and display body
  • Adhesive sheet and display body

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0094] (4) Preparation of adhesive composition

[0095] The adhesive composition P can be produced by preparing a (meth)acrylate polymer (A), and adding a crosslinking agent (B) and additive.

[0096] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting a polymer by a normal radical polymerization method. It is preferable to perform polymerization of a (meth)acrylate polymer (A) by the solution polymerization method using a polymerization initiator as needed. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, and the like, and two or more of them may be used in combination.

[0097] Examples of the polymerization initiator include azo compounds, organic peroxides, and the like, and two or more types may be used in combination. Examples of azo compounds include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cy...

preparation example 1

[0201] -Production of a laminate having a first adhesive layer or a second adhesive layer-

[0202] (1) Preparation of (meth)acrylate polymer (A)

[0203] A (meth)acrylate polymer (A) was prepared by copolymerizing 60 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of methyl methacrylate, and 20 parts by mass of 2-hydroxyethyl acrylate. As a result of measuring the molecular weight of this (meth)acrylate polymer (A) by the method mentioned later, the weight average molecular weight (Mw) was 600,000.

[0204] (2) Preparation of Adhesive Composition P

[0205]100 parts by mass of the (meth)acrylate polymer (A) obtained in the above step (1) (value in terms of solid content; the same applies hereinafter), trimethylolpropane-modified toluene as a crosslinking agent (B) 0.25 parts by mass of diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., product name "Coronate L"), and 3-glycidyloxypropyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd., product name...

preparation example 2～ preparation example 3

[0224] As shown in Table 1, the types and ratios of the monomers constituting the (meth)acrylate polymer (A) and the weight average molecular weight of the (meth)acrylate polymer (A) were changed. Besides, a laminated body was prepared in the same manner as in Preparation Example 1.

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Abstract

The invention provides an adhesive sheet and a display body. The adhesive sheet (1) has an adhesive layer (2), wherein the adhesive layer (2) includes: a first adhesive layer (21), which is an outer layer on one surface side; a second adhesive layer (22), It is the outer layer on the other surface side: and the third adhesive layer (23), which is located between the first adhesive layer (21) and the second adhesive layer (22) as an intermediate layer, constituting the first adhesive layer (23). The storage modulus (G') of the adhesive of the adhesive layer (21) and the adhesive constituting the second adhesive layer (22) at 23°C is respectively above 0.1 MPa, and the third adhesive layer (23) is composed of active The composition of the energy ray curable adhesive, the storage modulus (G') of the adhesive constituting the first adhesive layer (21) and the storage modulus (G') of the adhesive constituting the second adhesive layer (22) ') compared to the storage modulus (G') of the active energy ray-curable adhesive before curing is lower.

Description

technical field [0001] The present invention relates to an adhesive sheet suitable for laminating constituent members of a display body, and a display body obtained by using an adhesive layer of the adhesive sheet. Background technique [0002] In recent years, various mobile electronic devices such as smartphones and tablet computers have been equipped with displays using a display module, which is usually a touch panel, and the display module has a liquid crystal element, a light-emitting diode (LED element), Organic electroluminescent (organic EL) elements, etc. [0003] In the above-mentioned display, a protective panel is usually provided on the surface side of the display module. As electronic devices become thinner and lighter, the above-mentioned protective panels have been changed from conventional glass plates to plastic plates such as acrylic plates and polycarbonate plates. [0004] In Hua, a gap is provided between the protective panel and the display module t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/30C09J133/08C09J11/06C09J4/06C09J4/02C08F220/18C08F220/14C08F220/28G09F9/35G09F9/33H01L27/32
CPCG09F9/33G09F9/35C09J4/06C09J7/00C09J11/06C09J133/08C08F220/14C08F220/18C08F220/28C08K5/5435C08K5/205C09J2203/326C09J2433/00C09J2301/208C09J2301/124C09J2301/312H10K59/00C08F220/281C09J7/20C09J2203/318
Inventor 渡边旭平荒井隆行所司悟
Owner LINTEC CORP
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