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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 adhesives, adhesive types, electric solid devices, etc., can solve the problems of floating and peeling, and achieve the effect of excellent bending resistance and not easy to float or peel

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.

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
Comparison scheme
Effect test

preparation example Construction

[0074] (2) Preparation of Adhesive Composition P

[0075] The adhesive composition P can be prepared by preparing the (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A) with the crosslinking agent (B), and simultaneously Add additives as needed.

[0076] The (meth)acrylate polymer (A) can be produced by polymerizing a mixture of monomers constituting a polymer by a normal 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. By polymerizing the (meth)acrylate polymer (A) by the 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 production of low molecular weight bodies. Therefore, even when the gel fraction is small and the degree of crosslinking is slowed down, the adhesive is ...

manufacture example

[0109] As one production example of the adhesive sheet 1, the case where the said adhesive composition P is used is demonstrated. A coating solution of the adhesive composition P is coated on the peeling surface of a release sheet 12a (or 12b), and heat-treated to form a coating layer by thermally crosslinking the adhesive composition P. The peeling surface of another peeling sheet 12b (or 12a) is superimposed on it. When the aging period is required, the coating layer becomes the adhesive layer 11 by setting the aging period, and when the aging period is unnecessary, the coating layer becomes the adhesive layer 11 directly. Thus, the above-mentioned adhesive sheet 1 was obtained. The conditions of heat treatment and aging are as above.

[0110] As another production example of the adhesive sheet 1, a coating solution of the adhesive composition P is applied to the release surface of one release sheet 12a, and heat-treated to thermally crosslink the adhesive composition P to...

Embodiment

[0134] Hereinafter, although an Example etc. demonstrate this invention more concretely, the scope of the present invention is not limited by these Examples etc.

[0135] 1. Preparation of (meth)acrylate polymer (A)

[0136] The n-butyl acrylate of 54 mass parts, the 2-ethylhexyl acrylate of 45 mass parts and the 4-hydroxybutyl acrylate of 1 mass part are copolymerized by solution polymerization, thereby prepare (meth)acrylic acid ester polymer (A ). 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 800,000.

[0137] 2. Preparation of Adhesive Composition

[0138] 100 parts by mass (value in terms of solid content; hereinafter the same) of the (meth)acrylate polymer (A) obtained in the above step 1, 0.25 parts by mass of trimethylolpropane modified as a crosslinking agent (B) Xylylene diisocyanate (XDI; manufactured by Soken Chemical & Engineering Co., Ltd., product na...

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Abstract

Provided is an adhesive for a repeatedly foldable device, which has excellent foldable resistance even when used in a repeatedly foldable device and placed in a long-term foldable state. The adhesivefor the repeatedly foldable device is used for adhering one foldable component and the other foldable component which form the repeatedly foldable device. With JIS K7244-1 as a reference, the maximumrelaxation modulus value measured when the adhesive is deformed by 10% is set as the maximum relaxation modulus G (t) max (MPa), the adhesive is continuously deformed by 10% from the time when the maximum relaxation modulus G (t) max is measured to 3757 seconds, 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 [delta] logG (t) calculated by formula (I) is 0.33-1.50. [delta]log(t)=log(t)max-logG(t)min...(I).

Description

technical field [0001] The present invention relates to an adhesive for repeatedly bending devices, an adhesive sheet, a repeatedly bending laminated member, and a repeatedly bending device. Background technique [0002] In recent years, a bendable display capable of bending has been proposed as a display body (display) of an electronic device, which is one type of device. As bendable displays, in addition to bendable displays that undergo only one-time curved surface molding, repeatedly bendable displays for repeated bending (bending) applications have been proposed. [0003] In the repeatedly bending display as described above, it is conceivable to bond one bendable member (bendable member) and another bendable member constituting the bendable display via an adhesive layer of an adhesive sheet. However, when a conventional adhesive sheet is used for a repeatedly curved display, problems of floating or peeling occur at the interface between the adhesive layer and the adher...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J11/06C09J7/38
CPCC09J133/066C09J11/06C09J7/385C09J2203/318C09J2467/006C08K5/0025C08K5/5435Y02E10/549C09J133/04C09J7/40C09J2301/312H10K77/111H10K50/8426H10K2102/311
Inventor 七岛祐小泽祐树渡边旭平小鲭翔
Owner LINTEC CORP