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:
Sep. 15, 2026
Filed:
Nov. 16, 2022
Applicant:
Tosoh Corporation, Shunan, JP;
Inventors:
Assignee:
TOSOH CORPORATION, Shunan, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/30 (2006.01); C08K 5/01 (2006.01); C08K 5/06 (2006.01); C08K 5/18 (2006.01); C08K 5/3437 (2006.01); C08K 5/3492 (2006.01); C08K 5/45 (2006.01); C08L 67/02 (2006.01);
U.S. Cl.
CPC ...
C08L 67/02 (2013.01); C08K 5/01 (2013.01); C08K 5/06 (2013.01); C08K 5/18 (2013.01); C08K 5/3437 (2013.01); C08K 5/3492 (2013.01); C08K 5/45 (2013.01); G02B 5/3016 (2013.01); C08L 2201/10 (2013.01); C08L 2203/16 (2013.01);
Abstract
There has been a demand for an optical film having excellent glass-range photoelastic coefficient and a polarizing plate which uses this optical film. The present invention provides an optical film which is characterized by containing an ester-based resin that contains 50% by mole or more of a fumaric acid ester residue unit represented by formula (1) and having a negative birefringence, and a photoelasticity regulator having a positive birefringence, and which is also characterized in that the absolute value of the glass-range photoelastic coefficient thereof is 5×10Paor less.