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.:
Date of Patent:
Apr. 26, 2016
Filed:
Jul. 16, 2013
Applicant:
Tosoh Corporation, Shunan-shi, JP;
Inventors:
Assignee:
TOSOH CORPORATION, Shunan-shi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F 222/14 (2006.01); G02B 5/30 (2006.01); G02B 1/08 (2006.01); G02F 1/13363 (2006.01);
U.S. Cl.
CPC ...
C08F 222/14 (2013.01); G02B 1/08 (2013.01); G02B 5/3083 (2013.01); G02F 1/133634 (2013.01); G02F 2001/133638 (2013.01);
Abstract
To provide a novel diisopropyl fumarate-cinnamic acid derivative-based copolymer expected to be formed into a retardation film having excellent optical properties ensuring that, for example, the refractive index in the film thickness direction and the out-of-plane retardation are large and even in the form of a thin film, the film has a high out-of-plane retardation, and a retardation film using the same. The diisopropyl fumarate-cinnamic acid derivative-based copolymer contains: a diisopropyl fumarate residue unit; and a cinnamic acid residue unit or a cinnamic acid ester residue unit having an alkyl group with a carbon number of 1 to 6.