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:
Aug. 17, 1976
Filed:
Apr. 18, 1975
Yasuhiro Suzuki, Ibaraki, JA;
Katsuhiko Yamaguchi, Ibaraki, JA;
Nitto Electric Industrial Co., Ltd., Ibaraki, JA;
Abstract
An imide-ring containing polyester comprising the reaction product of (A) (1) a dicarboxylic acid of the formula ##EQU1## wherein R.sub.1 represents a divalent organic group, R.sub.2 represents a trivalent organic group, and n.gtoreq.1, the dicarboxylic acid of the formula (I) comprising the reaction product of 1 mole of an imide compound having terminal amino groups of the formula (II) ##EQU2## wherein R.sub.1 has the same meaning as above, or of an imide precursor thereof, with 2 moles of a tricarboxylic acid anhydride of the formula (III) ##EQU3## wherein R.sub.2 has the same meaning as above, the imide compound of the formula (II) being prepared by reacting n moles of 1,2,3,4-butanetetracarboxylic acid (hereinafter referred to as BTC) with (n+1) moles of a diamine of the formula (IV)