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Adhesive for repeatedly foldable device, adhesive sheet, repeatedly foldable laminate member and repeatedly foldable device

A technology of repeated bending and adhesive layer, applied in the direction of adhesive, adhesive type, ester copolymer adhesive, etc., can solve problems such as deformation of adhesive layer

Pending Publication Date: 2019-06-25
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a conventional adhesive sheet is used for such a flexible display for such an application, even after the bending state is released, the adhesive layer is still deformed, and the flexible display is always greatly bent, resulting in being fixed in the bent state. Case

Method used

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  • Adhesive for repeatedly foldable device, adhesive sheet, repeatedly foldable laminate member and repeatedly foldable device
  • Adhesive for repeatedly foldable device, adhesive sheet, repeatedly foldable laminate member and repeatedly foldable device
  • Adhesive for repeatedly foldable device, adhesive sheet, repeatedly foldable laminate member and repeatedly foldable device

Examples

Experimental program
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Effect test

preparation example Construction

[0087] (2) Preparation of Adhesive Composition P

[0088] Adhesive composition can be prepared by preparing (meth)acrylate polymer (A), mixing obtained (meth)acrylate polymer (A) with crosslinking agent (B), and adding additives as required p.

[0089] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer using a general radical polymerization method. The polymerization of the (meth)acrylate polymer (A) is preferably performed by a 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.

[0090] As a polymerization initiator, an azo compound, an organic peroxide, etc. are mentioned, and 2 or more types may be used together. Examples of azo compounds include 2,2'-azobisisobutyronitrile, 2,2'-azo...

Embodiment 1

[0147] 1. Preparation of (meth)acrylate polymer (A)

[0148] By solution polymerization, 47.8 mass parts of 2-ethylhexyl acrylate, 47.8 mass parts of n-butyl acrylate, 4 mass parts of acrylic acid and 0.4 mass parts of 2-hydroxypropyl acrylate are copolymerized to prepare (meth)acrylic acid Ester polymer (A). When the molecular weight of this (meth)acrylate polymer (A) was measured using the method mentioned later, it was 600,000 in weight average molecular weight (Mw).

[0149] 2. Preparation of Adhesive Composition

[0150] 100 parts by mass (solid content conversion value; hereinafter the same) of the (meth)acrylate polymer (A) obtained in the above step 1 and 3.75 parts by mass of trimethylolpropane as a crosslinking agent (B) were modified. Toluene diisocyanate (manufactured by TOYOCHEM Co., Ltd., product name "BHS8515") was mixed, stirred well, and diluted with toluene to obtain a coating solution of an adhesive composition (solid content concentration: 30.0% by mass)....

Embodiment 2

[0155] Except having changed the compounding quantity of a crosslinking agent (B) into 6.56 mass parts, it carried out similarly to Example 1, and produced the adhesive sheet.

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PUM

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Abstract

The invention provides an adhesive for a repeatedly foldable device and an adhesive sheet, which can inhibit the deformation of an adhesive layer and alleviate the influence caused by the repeated folding and the folding state of the repeatedly foldable device after the folding state is released when the adhesive is suitable for the repeatedly foldable device and is repeatedly bent and placed in the long-term folding state. The adhesive is used for bonding one folding member and the other folding member which form the repeatedly foldable device. Wherein the JIS K7244-1 is taken as a reference,and the JIS K7244-1 is taken as a reference; the maximum relaxation modulus value measured when the adhesive is deformed by 10% is set as the maximum relaxation modulus G(t)max (MPa). The adhesive iscontinuously deformed by 10% from the measurement of the maximum relaxation modulus G(t)max to 3757 seconds later, the minimum relaxation modulus value measured during this period is set to be the minimum relaxation modulus G(t)min (MPa), and the relaxation modulus variation value logG(t) calculated by formula (I) is 0.85 or less. Delta(logG(t)) = logG(t) max-logG(t) min...(I).

Description

technical field [0001] The present invention relates to an adhesive agent and an adhesive sheet for a repeated bending device, a repeated bending laminated member, and a repeated bending device. Background technique [0002] In recent years, a bendable display has been proposed as a display body (display) of an electronic device which is a type of device. This flexible display is expected to be widely used, for example, as a fixed display that is bent and installed on a cylindrical column, or as a mobile display that can be bent, folded, or rolled up to be transported. [0003] Examples of types of flexible displays include organic electroluminescence (organic EL) displays, electrophoretic displays (electronic paper), liquid crystal displays using plastic films as substrates, and the like. [0004] In the flexible display described above, it is generally considered that one flexible member (flexible member) constituting the flexible display is bonded to the other flexible m...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J7/10C09J7/30
CPCC09J9/00C09J133/08C09J133/10C09J11/06C09J7/00
Inventor 七岛祐樫尾干广
Owner LINTEC CORP
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