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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.:

US 4820793 B1

PDFFull Text
Date of Patent:
Apr. 11, 1989

Filed:

May. 28, 1987

Method of preparing aromatic polyamides and polybenzoxazoles

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:

Fleit, Jacobson, Cohn & Price

Primary Examiner:

Harold D Anderson

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.

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Imai, Yoshio. (1989). Method of preparing aromatic polyamides and polybenzoxazoles (U.S. Patent No. 4820793). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4820793

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