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. 11, 1989
Filed:
May. 28, 1987
Applicant:
Inventors:
Yoshio Imai, Tokyo, JP;
Masaaki Kakimoto, Yokohama, JP;
Yoshiyuki Oishi, Tokyo, JP;
Yutaka Maruyama, Kawasaki, JP;
Assignee:
Central Glass Company, Limited, Ube, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528183 ; 528 26 ; 528 33 ; 528 38 ; 528 43 ; 528185 ; 528348 ;
Abstract
An aromatic polyamide of sufficiently high molecular weight is prepared by reacting a diphenyldiamino compound having a hydroxyl or siloxyl group in each phenyl group and a Si-containing substituent in each amino group, e.g. 2,2-bis(3-trimethylsilylamino-4-trimethylsiloxyphenyl) propane, with an aromatic dicarboxylic acid dihalide in an organic solvent. The polyamide can be converted into a polybenzoxazole by a dehydrating and cyclizing reaction at 100.degree.-500.degree. C.