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:
Nov. 03, 1998
Filed:
Mar. 26, 1997
Hideyuki Nishikawa, Ashigara, JP;
Ken Kawada, Ashigara, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A process for producing ester-substituted polyvinyl alcohol from a compound having a carboxyl group and polyvinyl alcohol, which comprises converting the compound having a carboxyl group to an active derivative thereof and reacting the active carboxylic acid derivative with polyvinyl alcohol in the presence of a base the conjugate acid of which has a pKa of 11 or more; and a thin film, provided on a transparent substrate, which comprises a film of the ester-substituted polyvinyl alcohol as a liquid crystal alignment layer and an optically anisotropic layer containing a discotic liquid crystal compound which has at least one substituent capable of forming a new bond intermolecularly or intramolecularly and which is capable of forming a discotic nematic phase.