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:
Aug. 18, 2009
Filed:
Mar. 04, 2004
Lachezar Komitov, Göteborg, SE;
Bertil Helgee, Västra Frölunda, SE;
Lachezar Komitov, Göteborg, SE;
Bertil Helgee, Västra Frölunda, SE;
Ecsibeo PPF2 AB, Göteborg, SE;
Abstract
The invention relates to a polymer for use as a surface-director alignment layer in a liquid crystal device, the polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises at least two unsubstituted and/or substituted phenyls coupled via a coupling selected from the group consisting of a carbon-carbon single bond (—), a carbon-carbon double bond containing unit (—CH═CH—), a carbon-carbon triple bond containing unit (—C≡C—), a methylene ether unit (—CHO—), an ethylene ether unit (—CHCHO—), an ester unit (—COO—) and an azo unit (—N═N—), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielectric anisotropy, and is attached to the polymeric backbone via at least two spacing atoms.