Method for preparing polyamide-imide resin

Details Method for preparing polyamide-imide resin Method for preparing polyamide-imide resin

1982-11-04

1984-05-08

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...

528 49, 528 52, 528 53, 528 73, C08G 1880

Patent

active

044475896

ABSTRACT:
A polyamide-imide resin which can give a varnish having a high resin content, excellent in storage stability and heat resistant final products can be produced by reacting an aromatic diisocyanate with a tricarboxylic acid anhydride in the presence of a basic solvent while adjusting the resin content at 40% by weight or more, and adding a specific amount of lactam and a specific amount of an alcohol and/or an oxime separately before, during or after the above-mentioned reaction so as to adjust the reduced viscosity of the resin to 0.10 to 0.27.

REFERENCES:
patent: 4076694 (1978-02-01), Zecher et al.

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