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:
Jul. 31, 2012
Filed:
Oct. 30, 2008
Takahiro Higeta, Tokyo, JP;
Hiroaki Ohno, Tokyo, JP;
Yuichi Sadamitsu, Tokyo, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Polatechno Co., Ltd., Niigata, JP;
Abstract
Disclosed is an azo compound represented by the formula (1) or (2) or a salt thereof. The azo compound or the salt thereof has an excellent light-polarizing property, and is extremely useful as a dichroic dye for use in a polarizing plate that shows less color leakage in a visible light range or a polarizing plate for a liquid crystal projector comprising the aforementioned polarizing plate. (1) (2) wherein Rrepresents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, a sulfonate group or a carboxyl group; Rto Rindependently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or an acetylamino group; X represents a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent, or a naphthotriazole group which may have a substituent; m represents a numeral number of 1 or 2; and n represents a numeral number of 0 or 1.