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Composition for transparent adhesive/pressure-sensitive adhesive sheet, process for producing same, and transparent adhesive/pressure-sensitive adhesive sheet

A technology of adhesive sheet and composition, which is applied in the field of transparent adhesive adhesive sheet and composition for transparent adhesive adhesive sheet, which can solve the problems of water-absorbing acid corrosion, inaccessibility, safety and unpreferability, etc., and achieve adhesion The effect of good force and high shear stress

Inactive Publication Date: 2014-12-31
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in photocation-curable adhesive compositions, water absorption, which is a disadvantage of photocation polymerization, and corrosion due to acid derived from photocation polymerization initiators are problems.
In addition, an active energy ray-curable adhesive sheet obtained by semi-curing an active energy ray-curable composition contains a large amount of uncured low-molecular-weight components, so it is not preferable from the viewpoint of the safety of the work environment. class questions
[0006] In short, the current situation is that it is impossible to obtain an excellent adhesive composition for an adhesive sheet that combines all properties such as adhesiveness, step followability, curability, and adhesiveness at a high level.

Method used

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  • Composition for transparent adhesive/pressure-sensitive adhesive sheet, process for producing same, and transparent adhesive/pressure-sensitive adhesive sheet
  • Composition for transparent adhesive/pressure-sensitive adhesive sheet, process for producing same, and transparent adhesive/pressure-sensitive adhesive sheet
  • Composition for transparent adhesive/pressure-sensitive adhesive sheet, process for producing same, and transparent adhesive/pressure-sensitive adhesive sheet

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Embodiment 1~4、 comparative example 1~2

[0112] A crosslinking agent and a photopolymerization initiator were mixed with the compositions shown in Table 2, and the solid content concentration was adjusted with n-propyl acetate to obtain an adhesive composition solution (solid content concentration: 50% by mass). The obtained adhesive composition solution was mixed using a disperser to prepare a composition solution for a transparent adhesive sheet. This solution was cast-coated on one side of a polyethylene terephthalate (PET) film with a thickness of 50 μm so that the thickness after drying was 50 μm (coating layer thickness: 100 μm), and heated at 50° C. After drying for 5 minutes and heating and drying at 110° C. for 3 minutes, the release-treated side of the release film of a 50-μm-thick PET film on one side was covered with the adhesive side. Then, aging was performed at 40° C. for 72 hours to prepare a transparent pressure-sensitive adhesive sheet (PET base type).

[0113] (Acid Value of Composition for Transp...

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Abstract

Provided is a composition for transparent adhesive / pressure-sensitive adhesive sheets which are for use in sealing electronic components or protecting wiring, the composition showing moderate pressure-sensitive adhesive properties and conformability to level differences during initial adhesion to adherends and, upon photocuring after bonding, coming to show high peel resistance and high shear stress that are equal to those of adhesives. The composition for transparent adhesive / pressure-sensitive adhesive sheets comprises: (A) a (meth)acrylic copolymer having structural units represented by chemical formula (I) (wherein R1's each independently represent a hydrogen atom or a methyl group, R2's each independently represent a C1-6 alkylene group, and R3 represents a residue formed by removing hydroxy groups from a polyolefin polyol or hydrogenated polyolefin polyol) and chemical formula (II) (wherein R4 represents a hydrogen atom or a methyl group, R5 represents a C1-6 alkylene group, and R6 represents a residue formed by removing hydroxy groups from a polyolefin polyol or hydrogenated polyolefin polyol); (B) a crosslinking agent; and (C) a photopolymerization initiator.

Description

technical field [0001] The present invention relates to a composition for a transparent adhesive sheet, a method for producing the same, and a transparent adhesive sheet formed from the composition for a transparent adhesive sheet. Background technique [0002] In recent years, adhesives excellent in heat resistance and light resistance have been widely used for bonding optical members used in electronic components such as liquid crystal display devices and touch panels. However, since the adhesive is literally an adhesive, it is difficult to be used for bonding applications such as electronic components requiring high peeling force and shear stress, or sealing applications for electronic components requiring strength like adhesives. [0003] Based on such a background, the so-called adhesive adhesives or adhesive adhesive sheets that are initially adhesives with excellent adhesiveness and flexibility and become adhesives that exhibit high strength by heat or light curing ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00B32B27/00B32B27/30C09J7/02C09J11/06C09J133/00C09J133/14C09J175/14
CPCC08G2170/40C09J175/04C09J7/22C09J7/29C09J7/385C09J133/08C09J2203/00C09J2301/302
Inventor 中西健一伊藤大悟佐佐木一博竹内雄太
Owner SHOWA DENKO KK
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