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:
Feb. 18, 2014
Filed:
Jun. 23, 2011
Takashi Sera, Tokyo, JP;
Takahiro Takagi, Kanagawa, JP;
Shigeki Oka, Tokyo, JP;
Ayako Inagaki, Tokyo, JP;
Takashi Sera, Tokyo, JP;
Takahiro Takagi, Kanagawa, JP;
Shigeki Oka, Tokyo, JP;
Ayako Inagaki, Tokyo, JP;
Konical Minolta Advanced Layers, Inc., Tokyo, JP;
Abstract
The purpose of the present invention is to provide: a retardation film which uses a low-substituted cellulose ester and has improved retardation after saponification and improved wet heat stability of internal haze; a polarizing plate which uses the retardation film; and a liquid crystal display device. An optical film of the present invention contains a cellulose ester and a compound represented by general formula (1), and is characterized in that the compound has an average degree of substitution within the range of 3.0-6.0 and contains a component having a degree of substitution of 4 or less in an amount of 30-80% by mass (inclusive). (In the formula, R-Reach represents a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted allylcarbonyl group, and R-Rmay be the same as or different from one another.)