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:
Jan. 29, 1991
Filed:
Jul. 11, 1989
Isao Maruyama, Ichihara, JP;
Hiroshi Fujiwara, Ohmiya, JP;
Yoshiharu Ito, Ichihara, JP;
Hitoshi Shigematsu, Ichihara, JP;
Maruzen Petrochemical Co., Ltd., Tokyo, JP;
Abstract
A novel phosphazene polymer having Schiff base structures is disclosed. The polymer is a condensation reaction product of a cyclic phosphonitrilic compound represented by the general formula (I): ##STR1## (wherein n is an integer 3 or 4, and 2n A's are independently selected from a group consisting of a formylphenoxy group, a phenoxy group, an alkylphenoxy group, a halogenated phenoxy group, an N-aromatic azomethine-phenoxy group, and a fluoroalkoxy group, provided more than 2 formylphenoxy groups being contained per molecule on the average) and a primary diamine or a primary polyamine, The polymer contains Schiff base bonds derived from formylphenoxy groups and amines and is represented by the formula: ##STR2## (wherein Z is a residual group said primary diamine or primary polyamine and may have bonds other than those indicated). The polymer exhibits a 20% or less weight loss under thermobalance analysis at 400.degree. C. and has a glass transition teperature (Tg) of 120.degree. C. or higher.