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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 11447662 B1

PDFFull Text
Date of Patent:
Sep. 20, 2022

Filed:

Nov. 14, 2016

Optical transparent adhesive sheet, method for producing optical transparent adhesive sheet, laminated body, and display device with touch panel

Applicant:

Bando Chemical Industries, Ltd., Hyogo, JP;

Inventors:

Jun Onishi, Hyogo, JP;

Soichiro Nakane, Hyogo, JP;

Yuki Hosokawa, Hyogo, JP;

Assignee:

BANDO CHEMICAL INDUSTRIES, LTD., Hyogo, JP;

Attorney:

JCIPRNET

Primary Examiner:

Michael Zhang

Int. Cl.
CPC ...
C09J 7/22 (2018.01); B32B 27/40 (2006.01); C09J 175/08 (2006.01); G02F 1/1333 (2006.01); G06F 3/041 (2006.01); G09F 9/00 (2006.01); C09J 175/04 (2006.01); B32B 27/00 (2006.01); C09J 7/10 (2018.01); C09J 7/30 (2018.01); C09J 11/08 (2006.01); C09J 7/38 (2018.01);
U.S. Cl.
CPC ...
C09J 7/22 (2018.01); B32B 27/00 (2013.01); B32B 27/40 (2013.01); C09J 7/10 (2018.01); C09J 7/30 (2018.01); C09J 7/38 (2018.01); C09J 11/08 (2013.01); C09J 175/04 (2013.01); C09J 175/08 (2013.01); G02F 1/1333 (2013.01); G06F 3/041 (2013.01); G09F 9/00 (2013.01); C09J 2203/318 (2013.01); C09J 2475/00 (2013.01);
Abstract

The present invention provides an optically clear adhesive sheet with reduced delay bubble generation using a thermosetting polyurethane composition that has excellent flexibility and is capable of giving a thick film. The optically clear adhesive sheet of the present invention is an optically clear adhesive sheet formed of a cured product of a thermosetting polyurethane composition, the optically clear adhesive sheet having a shear storage modulus (G') at 85° C. of 4.5×10to 5.0×10Pa, a loss tangent (tan δ) at 85° C. of 0.3 to 0.97, and a thickness of 50 to 2000 μm. The optically clear adhesive sheet preferably has an adhesive strength measured by a 180° peel test of 2 N/25 mm or more.

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