US 9,850,408 B2Granted

Optical adhesive film having excellent peeling effect at high temperatures

AssigneeLG Chem, Ltd.

InventorsChan Oh Yoon, Jang Soon Kim, Min Seok Song, Eun Kyung Park, Bu Gi Jung

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Abstract

The present invention relates to an optical adhesive film which has excellent adhesive strength at room temperature and has improved efficiency in a rework process since peel strength is low at high temperatures. When attaching a touchscreen panel and an LCD by using the adhesive film of the present invention and separating the touchscreen panel and the LCD at high temperatures, the touchscreen panel and the LCD can be separated from each other without causing damage thereto. Additionally, the optical film of the present invention comprises two adhesive layers, wherein peeling occurs at the first adhesive layer having an adhesive composition such that a peeling surface can be controlled according to the convenience of a user.

Claims11

Dependent claims

An optical adhesive film comprising:

a first adhesive layer formed by curing an acrylic adhesive composition;
and
a second adhesive layer disposed on an upper side of the first adhesive layer and formed by curing an adhesive composition exhibiting higher adhesive strength than the acrylic adhesive composition forming the first adhesive layer,
wherein the acrylic adhesive composition forming the first adhesive layer comprises a first acrylic polymer, a second acrylic polymer, an amide bond-containing compound, and a curing agent,
wherein the amide bond-containing compound is present in an amount of 0.5 parts by weight to 10 parts by weight based on 100 parts by weight of the first acrylic polymer, and
wherein the adhesive composition forming the second adhesive layer does not comprise the amide bond-containing compound.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/406,314Filed 8 Jan 2013
Priority: KR 10-2012-006306413 Jun 2012
Published: US 2015/0125675 A17 May 2015
Granted: 26 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

C09J 133/08
Of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical: homopolymers or…
C08L 33/04
Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon…:…
C08L 33/08
Of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical: homopolymers or…
C09J 7/10
Adhesives in the form of films or foils: without carriers