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:
Feb. 21, 1978
Filed:
Dec. 18, 1975
Shuji Ozawa, Hachioji, JA;
Yasuo Nakagawa, Hino, JA;
Kichiro Matsuda, Hino, JA;
Toshio Nishihara, Hino, JA;
Hideki Yunoki, Hino, JA;
Teijin Limited, Osaka, JA;
Abstract
A novel fiber- or film-forming high-molecular-weight aromatic copolyamide consisting essentially of (1-A) a diamine recurring unit of the formula ##STR1## such as 3,4'-diaminodiphenyl ether or 3,4'-diaminodiphenyl sulfone, (1-B) a diamine recurring unit of the formula --HN--Ar.sub.1 --NH-- such as p-phenylene diamine, and (2) a dicarboxylic acid recurring unit of the formula --OC--Ar.sub.2 --CO-- such as terephthaloyl dichloride, wherein Y.sub.1, Ar.sub.1 and Ar.sub.2 are as defined in the specification, the total amount of recurring units (1-A) and (1-B) being substantially equimolar to recurring unit (2), and the proportion of recurring unit (1-A) being 7.5 to 40 mole% of the entire recurring units. The copolyamide is well soluble in solvents to give solutions having good flowability and stability that can afford shaped articles with superior thermal stability, fire retardancy and mechanical properties. A process for preparing the copolymer, and a dope of the copolymer are also provided.