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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 8993649 B1

PDFFull Text
Date of Patent:
Mar. 31, 2015

Filed:

Dec. 18, 2006

Pressure-sensitive adhesive for polarizing plates, pressure-sensitive adhesive sheet, polarizing plate with pressure-sensitive adhesive and production process for the same and optical film and production process for the same

Applicants:

Koichi Nagamoto, Saitama, JP;

Kentaro Kusama, Saitama, JP;

Mikihiro Kashio, Saitama, JP;

Kazuhiro Kon, Saitama, JP;

Motoyuki Hayakawa, Tokyo, JP;

Inventors:

Koichi Nagamoto, Saitama, JP;

Kentaro Kusama, Saitama, JP;

Mikihiro Kashio, Saitama, JP;

Kazuhiro Kon, Saitama, JP;

Motoyuki Hayakawa, Tokyo, JP;

Assignee:

Lintec Corporation, Tokyo, JP;

Attorney:

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

Primary Examiner:

Michael Pepitone

Assistant Examiner:

Jessica Roswell

Int. Cl.
CPC ...
B32B 9/00 (2006.01); B32B 15/04 (2006.01); C03C 6/00 (2006.01); C08G 18/67 (2006.01); G02B 5/30 (2006.01); B32B 37/12 (2006.01); C09D 4/06 (2006.01); C09J 7/00 (2006.01); C09J 7/02 (2006.01); G02B 7/00 (2006.01); G02F 1/1335 (2006.01); G02F 1/13363 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); B32B 37/12 (2013.01); C09D 4/06 (2013.01); C09J 7/00 (2013.01); C09J 7/0217 (2013.01); G02B 5/3033 (2013.01); B32B 2307/42 (2013.01); C09J 2433/00 (2013.01); G02B 7/00 (2013.01); G02F 1/133528 (2013.01); G02F 1/13363 (2013.01); G02F 2202/28 (2013.01);
Abstract

Provided is a pressure-sensitive adhesive for polarizing plates which can adhere a polarizing plate on a liquid crystal cell with good adhesion durability and has the characteristic that a liquid crystal display device obtained therefrom is less liable to cause light leakage even under the environment of high temperature and high humidity and which makes it possible remove the polarizing plate. The pressure-sensitive adhesive for polarizing plates is prepared by irradiating a pressure-sensitive adhesive material comprising (A) an acrylic base polymer having a weight average molecular weight of 1,000,000 or more comprising a monomer having a hydroxyl group in a monomer composition ratio of 10 mass % or less, (B) an acrylic base polymer having a weight average molecular weight of 1,000,000 or more comprising a monomer having a carboxyl group in a monomer composition ratio of 10 mass % or less and (C) an active energy beam-curable compound with an active energy beam, wherein a mass ratio of the component (A) to the component (B) is 100:1 to 100:50, and a storage elastic modulus (G') at 23° C. is 0.3 MPa or more.

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