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

A technology of repeated bending, adhesive layer, applied in the direction of adhesive, lamination device, adhesive type, etc., can solve the problems of peeling, the interface between the adhesive layer and the adherend, etc., to achieve the effect of excellent recovery

Active Publication Date: 2020-09-04
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a conventional adhesive sheet is used for a repeatedly curved display, there is a problem of floating or peeling at the interface between the adhesive layer and the adherend.
[0004] Patent Document 1 discloses an adhesive, the technical problem of which is to suppress the occurrence of floating or peeling of the adhesive layer even if it is repeatedly bent.

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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preparation example Construction

[0073] (2) Preparation of Adhesive Composition P

[0074] The adhesive composition P can be prepared by preparing a (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A) with a crosslinking agent (B), and simultaneously Add additives as needed.

[0075] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by a usual radical polymerization method. The polymerization of the (meth)acrylate polymer (A) is preferably carried out by a solution polymerization method using a polymerization initiator as required. By polymerizing the (meth)acrylate polymer (A) by a solution polymerization method, it becomes easy to increase the molecular weight of the obtained polymer and to adjust the molecular weight distribution, and it is possible to further reduce the generation of low molecular weight bodies. Therefore, it is less likely that the adhesive will shift due to long-term bending, and the recovery property f...

Embodiment 1

[0138] 1. Preparation of (meth)acrylate polymer (A)

[0139] A (meth)acrylate polymer (A) was prepared by copolymerizing 54 parts by mass of n-butyl acrylate, 45 parts by mass of 2-ethylhexyl acrylate, and 1 part by mass of 4-hydroxybutyl acrylate by a solution polymerization method. The molecular weight of this (meth)acrylate polymer (A) was measured by the method described later, and the weight average molecular weight (Mw) was 800,000.

[0140] 2. Preparation of Adhesive Composition

[0141] 100 parts by mass of the (meth)acrylate polymer (A) obtained in the above step 1 (solid content conversion value; hereinafter the same), trimethylolpropane-modified phthalomethene as a crosslinking agent (B) 0.25 parts by mass of diisocyanate (XDI; manufactured by Soken Chemical & Engineering Co., Ltd., product name "TD-75") and 0.20 parts by mass of 3-glycidyloxypropyltrimethoxysilane as a silane coupling agent were mixed, And fully stirred, and diluted with methyl ethyl ketone, the ...

Embodiment 2～9、 comparative example 1～3

[0158] In addition to the types and ratios of the monomers constituting the (meth)acrylate polymer (A), the weight average molecular weight (Mw) of the (meth)acrylate polymer (A), and the value of the crosslinking agent (B) The adhesive sheet was manufactured similarly to Example 1 except having changed the kind and compounding quantity to what is shown in Table 1.

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Abstract

The present invention provides an adhesive for a repeatedly foldable device, which is capable of suppressing the occurrence of floating and peeling even when the adhesive is applied to a repeatedly foldable device and placed in a long-term bending state, and which has excellent restorability from the bending state. The adhesive for the repeatedly foldable device is used for bonding one foldable member and the other foldable member which form the repeatedly foldable device. The maximum creep flexibility J (t) max (MPa<-1>) is set as the creep flexibility value measured after the pressure of 3000 Pa is continuously applied to the adhesive for 3757 seconds. Then, the creep recovery rate calculated according to formula (I) below is 70% or more, where J (t) min (MPa<-1>) is the minimum creep flexibility value measured after 3757 seconds when the stress applied to the adhesive is set to 0 Pa. The creep recovery rate (%) is equal to (1-J (t) min / J (t) max) * 100... (I).

Description

technical field [0001] The present invention relates to an adhesive and an adhesive sheet for a repeated bending device, a repeatedly bending laminated member, and a repeated bending device. Background technique [0002] In recent years, bendable flexible displays have been proposed as displays (displays) of electronic equipment which are one type of devices. As a flexible display, in addition to a display that undergoes only one-time curved surface molding, a repeatedly curved display for repeated bending (bending) has been proposed. [0003] In the repeatedly bending display as described above, it is conceivable to bond one bendable member (bendable member) and the other bendable member constituting the bendable display with an adhesive layer of an adhesive sheet. However, when a conventional adhesive sheet is used for a repeatedly curved display, there is a problem of floating or peeling at the interface between the adhesive layer and the adherend. [0004] Patent Docum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J11/06C09J7/30C09J7/10B32B7/12B32B1/00B32B7/022B32B37/12
CPCC09J133/066C09J11/06C09J7/30C09J7/10B32B7/12B32B1/00B32B7/022B32B37/1284B32B2307/558B32B2457/20C08K5/205C08K5/5435Y02E10/549C09J133/04C09J7/385C09J7/40C09J2301/312C09J2203/318H10K77/111H10K50/8426H10K2102/311
Inventor 七岛祐渡边旭平小鲭翔小泽祐树
Owner LINTEC CORP