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Repeated bending device, manufacturing method therefor, and suppressing method for bending traces

A technology of repeated bending and manufacturing methods, applied in the direction of bonding methods, film/sheet adhesives, non-polymer adhesive additives, etc., can solve the problems of bending marks, deformation of the adhesive layer, etc. trace effect

Active 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, the adhesive layer may be deformed even after the bent state is released, and the flexible display will always be greatly bent, showing bending marks

Method used

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  • Repeated bending device, manufacturing method therefor, and suppressing method for bending traces
  • Repeated bending device, manufacturing method therefor, and suppressing method for bending traces
  • Repeated bending device, manufacturing method therefor, and suppressing method for bending traces

Examples

Experimental program
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Effect test

preparation example Construction

[0097] (2-2) Preparation of Adhesive Composition P

[0098] 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.

[0099] 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.

[0100] 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'-a...

manufacture example 1

[0159][Manufacture Example 1] (Manufacture of Adhesive Sheet 1)

[0160] 1. Preparation of (meth)acrylate polymer (A)

[0161] Copolymerize 65 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of isobornyl acrylate, 5 parts by mass of N-acryloylmorpholine and 15 parts by mass of 2-hydroxyethyl acrylate by solution polymerization to prepare (Meth)acrylate polymer (A). As a result of measuring the molecular weight of this (meth)acrylate polymer (A) using the method mentioned later, the weight average molecular weight (Mw) was 500,000.

[0162] 2. Preparation of Adhesive Composition

[0163] Modified 100 parts by mass (in terms of solid content; hereinafter the same) of the (meth)acrylate polymer (A) obtained in the above step 1 and 1.20 parts by mass of trimethylolpropane as a crosslinking agent (B) Toluene diisocyanate (manufactured by TOYOCHEM Co., Ltd., product name "BHS8515") was mixed, stirred well, and diluted with methyl ethyl ketone (MEK), thereby obtaining a c...

manufacture example 2

[0167] [Manufacture Example 2] (Manufacture of Adhesive Sheet II)

[0168] An adhesive sheet was prepared in the same manner as in Example 1, except that the (meth)acrylate polymer (A) prepared in Production Example 1 was used and the blending amount of the crosslinking agent (B) was changed to 0.30 parts by mass II. The adhesive layer of this adhesive sheet II is called "adhesive layer II".

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Abstract

The invention provides a repeated bending device, which is not easy to generate bending traces after the bending state is released when the repeated bending is carried out or the repeated bending device is placed in a long-term bending state. Namely, a repeated bending device (10A) is provided. The pressure-sensitive adhesive tape is provided with one or more adhesive layers (111), (112), and (113). At least one layer of the adhesive layer is composed of the following adhesives: an adhesive; the maximum relaxation modulus value measured when the adhesive is deformed by 10% is set as the maximum relaxation modulus G(t)max(MPa). Continuously deforming the adhesive by 10% from the measurement of the maximum relaxation modulus G(t)max to 3,757 seconds later, wherein the minimum relaxation modulus value measured during this period is set as the minimum relaxation modulus G(t)min(MPa), and the relaxation modulus variation value logG(t) calculated from the following formula (I) is 1.20 or less. Delta(logG(t))=logG(t)max-logG(t) min... (I).

Description

technical field [0001] The present invention relates to a repetitive bending device, a method for manufacturing the repetitive bending device, and a method for suppressing bending marks in the repetitive 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 bonde...

Claims

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Application Information

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IPC IPC(8): C09J7/30C09J7/29C09J7/40C09J133/14
CPCC09J9/00C09J7/00C09J133/08C09J133/10C09J11/06C09J5/00
Inventor 七岛祐
Owner LINTEC CORP
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