Polyamide-imide solutions and a process for obtaining them

Details Polyamide-imide solutions and a process for obtaining them Polyamide-imide solutions and a process for obtaining them

1989-02-09

1990-08-21

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524211, 524233, 528 73, 528 84, C08J 300, C08J 302

Patent

active

049507001

ABSTRACT:
The present invention relates to solutions of polyamide-imides which can be spun and shaped, and to a process for their preparation.
They contain 5 to 30% of a polyamide-imide in a solvent mixture comprising 40-80% by weight of butyrolactone and 20-60% of an aprotic amide solvent. They are obtained by the reaction, in butyrolactone as polycondensation solvent, of a diisocyanate, an aromatic acid anhydride, optionally an alkali or alkaline-earth metal dicarboxybenzenesulfonate, and optionally another aromatic diacid, the concentration of polyamide-imide being from 15 to 36%, followed by dilution in an amide solvent, at a temperature between 120.degree. and 165.degree. C.
The solutions obtained are clear at room temperature, are storable, and possess improved color.

REFERENCES:
patent: 3903036 (1975-09-01), Gruffaz et al.
patent: 4181641 (1980-01-01), Boldebuck et al.
patent: 4549006 (1985-10-01), Zecher et al.

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