Modified polyamide-imide resins and method for making the same

Details Modified polyamide-imide resins and method for making the same Modified polyamide-imide resins and method for making the same

1981-08-03

1983-10-04

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

4273882, 428383, 528 53, 528 67, 528 73, C08G 1834

Patent

active

044080328

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.

REFERENCES:
patent: 3022200 (1962-02-01), Koerner et al.
patent: 3790530 (1974-02-01), Koerner et al.
patent: 3884880 (1975-05-01), Disque et al.
patent: 3937673 (1976-02-01), Koerner et al.

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