Process for preparing aromatic polyamides of high hydrolysis res

Details Process for preparing aromatic polyamides of high hydrolysis res Process for preparing aromatic polyamides of high hydrolysis res

1991-04-03

1992-09-22

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528179, 528182, 528183, 528185, 528335, 528336, 528340, C08G 6928

Patent

active

051497590

ABSTRACT:
There is described a process for preparing aromatic polyamides of high hydrolysis resistance by reacting aromatic diamines in a conventional organic solvent and in the presence or absence of inorganic salts wherein the diamine, which has a water content of up to 25% by weight, is dissolved in the organic solvent, which may likewise contain water, and the solution is subjected to a vacuum distillation until the water content of the bottom product is <100 ppm and subsequently the inorganic salts if necessary and then the dicarbonyl dichloride are added in a conventional manner and the condensation reaction is performed and concluded in a conventional manner.

REFERENCES:
patent: 3884881 (1975-05-01), Bice et al.
patent: 4396758 (1983-08-01), Nikiforov et al.

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