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Adhesive composition, adhesive sheet, and touch panel and display device having the adhesive sheet

A composition and adhesive technology, which is applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve the problems of low concave-convex followability, step residual bubbles, etc., and achieve The effect of suppressing the generation of delayed bubbles, suppressing delayed bubbles, and excellent unevenness followability

Active Publication Date: 2020-11-27
GUNZE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the irregularity followability is low, air bubbles tend to remain in the step portion

Method used

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  • Adhesive composition, adhesive sheet, and touch panel and display device having the adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (Preparation of Coating Solution)

[0057] First, 100 parts by weight of an acrylate copolymer (A) with a weight average molecular weight of 450,000 and a hydroxyl value of 90 to 100 was diluted with 44 parts by weight of a solvent, and then the oligomer (B), monomer (C), The crosslinking agent (D) and the photopolymerization initiator (E) are sufficiently stirred to prepare a coating liquid (adhesive solution) consisting of an adhesive composition and a solvent. Here, ethyl acetate was used as a solvent. Moreover, the model number "UF-8001G" by Kyoeisha Chemical Co., Ltd. was used as an oligomer (B), and 2.2 weight part was added with respect to 100 weight part of acrylate copolymers (A). 2-isocyanatoethyl methacrylate (2-isocyanate) was used as the monomer (C), and 0.11 parts by weight was added to 100 parts by weight of the acrylate copolymer (A). Moreover, the Tosoh Corporation (Tosoh Corporation) model "Coroneto HX" was used as a crosslinking agent (D), and 0.088...

Embodiment 2

[0061] Example 2 was produced in the same manner as in Example 1, except that 6.6 parts by weight of the oligomer (B) in Example 1 was added to 100 parts by weight of the acrylate copolymer (A). Adhesive sheet samples.

Embodiment 3

[0063] Example 3 was produced in the same manner as in Example 1, except that 11 parts by weight of the oligomer (B) in Example 1 was added to 100 parts by weight of the acrylate copolymer (A). Adhesive sheet samples.

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Abstract

The present invention provides an adhesive composition which has excellent conformability to irregularities when it is bonded to an adherend, and which can suppress generation of delayed bubbles, floating, and peeling after bonding, and an adhesive composed of the adhesive composition. Adhesive sheet for adhesive layer. In addition, there are provided a touch panel and a display device which include the pressure-sensitive adhesive sheet and can effectively suppress generation of retardation bubbles and the like after adhesion. The adhesive composition comprises: an acrylate copolymer having a crosslinkable functional group; an oligomer having two or more polymerizable unsaturated groups; a monomer having a functional group reactive with the acrylate copolymer and a A functional group that reacts with the oligomer; a crosslinking agent that reacts with the acrylate copolymer using heat; and a polymerization initiator that initiates a polymerization reaction by irradiating active energy rays.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive sheet, and a touch panel and a display device including the adhesive sheet. Background technique [0002] In recent years, display devices such as liquid crystal displays (LCDs) and input devices used in combination with the display devices, such as touch panels, have been widely used in various fields. In the manufacture of these display devices and input devices, for example, transparent double-sided pressure-sensitive adhesive sheets are used for bonding optical components, and transparent double-sided pressure-sensitive adhesive sheets are also used in bonding display devices and input devices. Here, the touch panel, liquid crystal display, and the like include components having steps (concave and convex portions) formed by printing, for example, in a mobile phone, a touch panel having a component having a frame-shaped printed portion is used. control panel. In such application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J4/02C09J7/30G06F3/041C09J7/20
CPCC09J133/08G06F3/041C09J7/20
Inventor 越智元气塚本修亮
Owner GUNZE LTD
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