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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 9458364 B1

PDFFull Text
Date of Patent:
Oct. 04, 2016

Filed:

Feb. 23, 2011

Adhesive sheet

Applicants:

Youichi Inao, Tokyo, JP;

Mikihiro Kashio, Tokyo, JP;

Inventors:

Youichi Inao, Tokyo, JP;

Mikihiro Kashio, Tokyo, JP;

Assignee:

LINTEC CORPORATION, Tokyo, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Prashant J Khatri

Assistant Examiner:

Travis Figg

Int. Cl.
CPC ...
G11B 5/64 (2006.01); B32B 7/02 (2006.01); B32B 27/32 (2006.01); C08G 18/08 (2006.01); C08K 5/06 (2006.01); C08L 93/00 (2006.01); C09J 175/04 (2006.01); C08G 18/10 (2006.01); C08G 18/48 (2006.01); C08L 33/14 (2006.01); C09J 133/14 (2006.01); C09J 7/02 (2006.01); C08F 220/18 (2006.01);
U.S. Cl.
CPC ...
C09J 175/04 (2013.01); C08G 18/10 (2013.01); C08G 18/4825 (2013.01); C08L 33/14 (2013.01); C09J 7/0207 (2013.01); C09J 133/14 (2013.01); C08F 2220/1808 (2013.01); C09J 2433/00 (2013.01); C09J 2475/00 (2013.01); Y10T 428/265 (2015.01); Y10T 428/2878 (2015.01); Y10T 428/2887 (2015.01);
Abstract

According to the present invention, there can be obtained a pressure sensitive adhesive sheet having an adhesive layer which even when the thickness is reduced to 5 μm or less, exhibits a desired adhesive strength. The pressure sensitive adhesive sheet includes a base material having an adhesive layer provided on at least one surface thereof, wherein a pressure sensitive adhesive constituting the adhesive layer contains (A) an acrylic copolymer having a crosslinkable functional group and (B) a urethane resin, the urethane resin is a product obtained by allowing an isocyanate-terminated urethane prepolymer obtained by a reaction between [b1] a diol and [b2] a polyvalent isocyanate compound to react with [b3] a chain extender, and the chain extender is composed of [b4] a compound having two hydroxyl groups and/or amino groups and [b5] a compound having three or more hydroxyl groups and/or amino groups, in a proportion of [b4] to [b5] of from 7/3 to 10/0 in terms of a mass ratio.

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