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. 21, 1998
Filed:
Jan. 31, 1997
Applicant:
Inventors:
Masayuki Kimura, Yokkaichi, JP;
Tsukasa Toyoshima, Yokkaichi, JP;
Keiichi Yamamoto, Yokkaichi, JP;
Kengo Wakabayashi, Yokkaichi, JP;
Yasuo Matsuki, Yokkaichi, JP;
Kyouyu Yasuda, Tsu, JP;
Assignee:
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
528353 ; 528170 ; 528172 ; 528173 ; 528176 ; 528183 ; 528188 ; 528220 ; 528229 ; 528310 ; 528322 ; 528332 ; 528335 ; 528350 ; 428-1 ; 4284735 ;
Abstract
There are provided a polyamic acid obtainable by reacting a diamine compound of the formula (1) ##STR1## wherein R.sup.1 is an alkyl group having 1 to 12 carbon atoms, a haloalkyl group having 1 to 12 carbon atoms or a halogen atom, each of X and Y is independently a divalent linking group, with a tetracarboxylic acid dianhydride; a polyimide obtainable by dehydrating and ring-closing the above polyamic acid; and a liquid crystal aligning agent containing the above polyamic acid and/or the above polyimide.