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. 28, 2009
Filed:
Aug. 28, 2003
Kimiaki Tsutsui, Funabashi, JP;
Takahiro Sakai, Funabashi, JP;
Kohei Goto, Funabashi, JP;
Nissan Chemical Industries, Ltd., Tokyo, JP;
Abstract
To provide a liquid crystal aligning agent useful to obtain a liquid crystal alignment film which exhibits a high voltage retention characteristic even under high temperature conditions and which has a low accumulation charge, and a liquid crystal display device which is less susceptible to lowering of contrast or to image persistence. A liquid crystal aligning agent comprising at least one selected from a polyamic acid obtained by reactive polymerization of a tetracarboxylic dianhydride component with a diamine component, and a polyimide obtained by cyclodehydration of the polyamic acid, characterized in that at least part of the tetracarboxylic dianhydride component is a tetracarboxylic dianhydride having an alicyclic structure or an aliphatic structure, and at least part of the diamine component is a diamine represented by the following formula (1): (wherein two among Rto Rare primary amino groups, and the rest are hydrogen atoms or monovalent organic groups other than primary amino groups, provided that they may be the same or different from one another), and a liquid crystal display device having a liquid crystal alignment film obtained from this liquid crystal aligning agent.