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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11267991 B1

PDFFull Text
Date of Patent:
Mar. 08, 2022

Filed:

Jul. 11, 2018

Transparent adhesive optical sheet, laminate and bonded structure

Applicant:

Bando Chemical Industries, Ltd., Hyogo, JP;

Inventors:

Hiroki Naito, Hyogo, JP;

Daisuke Takagi, Hyogo, JP;

Assignee:

BANDO CHEMICAL INDUSTRIES, LTD., Hyogo, JP;

Attorney:

JCIPRNET

Primary Examiner:

Anish P Desai

Int. Cl.
CPC ...
C09J 7/10 (2018.01); C09J 7/38 (2018.01); B32B 7/022 (2019.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 27/40 (2006.01);
U.S. Cl.
CPC ...
C09J 7/10 (2018.01); B32B 7/022 (2019.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/308 (2013.01); B32B 27/40 (2013.01); C09J 7/38 (2018.01); C09J 7/385 (2018.01); B32B 2307/412 (2013.01); B32B 2315/08 (2013.01); B32B 2333/04 (2013.01); B32B 2375/00 (2013.01); B32B 2405/00 (2013.01); C09J 2433/00 (2013.01); C09J 2475/00 (2013.01); Y10T 428/1476 (2015.01); Y10T 428/2848 (2015.01); Y10T 428/2891 (2015.01); Y10T 428/2896 (2015.01);
Abstract

The present invention provides an optically clear adhesive sheet that has excellent flexibility and prevents delay bubbles in high temperature and high humidity environments. The optically clear adhesive sheet of the present invention sequentially includes a first surface-adhesive layer, an intermediate adhesive layer, and a second surface-adhesive layer. The first surface-adhesive layer and the second surface-adhesive layer each have a higher storage elastic modulus at 85° C. than the intermediate adhesive layer. The first surface-adhesive layer and the second surface-adhesive layer each have a storage elastic modulus at 85° C. of 3.0×10Pa or higher and 30.0×10Pa or lower. The intermediate adhesive layer has a storage elastic modulus at 85° C. of 1.0×10Pa or higher and 15.0×10Pa or lower. The intermediate adhesive layer contains polyurethane.

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