Polyamide-imide solutions and the process for obtaining them

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

1991-05-17

1992-03-10

Kight, III, John

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524871, 524873, 528 71, C08G 1834

Patent

active

050950703

ABSTRACT:
The present invention relates to spinnable and mouldable polyamide-imide solutions as well as the process for their preparation.
They contain 4 to 35% of a polyamide-imide having a polydispersity index.ltoreq.2.1 in a solvent mixture containing 45-100% by weight of DMEU and 0-55% of an aprotic polar solvent. They are obtained by the reaction, in dimethylethyleneurea of pH.ltoreq.7 as polycondensation solvent, of a diisocyanate, an aromatic acid anhydride, optionally an alkali or alkaline earth dicarboxybenzene sulphonate and optionally another aromatic dicarboxylic acid, the polyamide-imide concentration therefore being from 4 to 35%, then by dilution in a polar solvent at a temperature of between 120.degree. and 200.degree. C.
The solutions thus obtained are limpid at ambient temperature, capable of being stored and have an improved color.

REFERENCES:
patent: 3505272 (1970-04-01), Gagliani
patent: 3673160 (1972-06-01), Buisson et al.
patent: 3843587 (1974-10-01), Keating et al.
patent: 4389521 (1943-06-01), Shimada et al.
patent: 4736008 (1988-04-01), Kouno et al.
patent: 4795795 (1989-01-01), Kouno et al.

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