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:
Oct. 04, 1983
Filed:
Aug. 03, 1981
George H Sollner, New Haven, IN (US);
Donny R Disque, Fort Wayne, IN (US);
Allan R Knerr, Fort Wayne, IN (US);
Phelps Dodge Industries, Inc., New York, NY (US);
Abstract
A modified polyamide-imide resin and method for making the same. The composition comprises the reaction product of an aromatic tricarboxylic acid anhydride reactant, an aromatic diisocyanate reactant and an aliphatic dicarboxylic acid reactant in a solution comprising an aprotic solvent at a temperature ranging from about 70.degree. C. to about 155.degree. C. The tricarboxylic acid anhydride reactant is present in an amount which is greater than about 25 mol percent of the total of the tricarboxylic acid anhydride-aliphatic dicarboxylic acid reactants. The method comprises the steps of dissolving the aromatic tricarboxylic acid anhydride and aliphatic dicarboxylic acid reactants and an excess of the aromatic diisocyanate reactants in aprotic solvent thereby forming a reaction solution. The aromatic tricarboxylic acid anhydride is present in an amount which is greater than about 25 mol percent of the total of the tricarboxylic acid anhydride-aliphatic dicarboxylic acid reactants. And, reacting the tricarboxylic acid anhydride, dicarboxylic acid and diisocyanate.