Process for preparing a cyclic amide polar solvent composition

Details Process for preparing a cyclic amide polar solvent composition Process for preparing a cyclic amide polar solvent composition

1981-11-19

1983-06-21

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, 528220, 528224, 528313, 528314, 528315, 524708, 524714, 524718, 524726, 524728, C08G 6926

Patent

active

043895212

ABSTRACT:
An aromatic and/or heterocyclic polyamide-amide type polar solvent composition is prepared by prepolymerizing an aromatic or heterocyclic diamine with an aromatic or heterocyclic or heterocyclic dicarboxylic acid chloride in a smaller molar equivalent than that of the diamine to prepare a prepolymer solution having a solution viscosity of 20 poise or less; by removing a by-product, hydrochloric acid, from the resultant prepolymer solution by neutralizing it with ammonia to such an extent that the pH of a mixture of 10 g of the neutralized mixture with 200 ml of water becomes 3.7 to 8.0; by high polymerizing the prepolymer with an additional amount of aromatic or heterocyclic dicarboxylic acid chloride, and; finally, by converting the entire amount of hydrochloric acid and 10 to 70% NH.sub.4 Cl in the resultant polyamide solution into an amide type polar solvent-soluble salt, with a neutralizing agent, the amount of the salt being in a range of from 5 to 95% by weight of the theoretical amount of the salt to be derived from the entire amount of the dicarboxylic acid chloride.

REFERENCES:
patent: 3360598 (1967-12-01), Earnhardt
patent: 3991037 (1976-11-01), Eckhardt
patent: 4297479 (1981-10-01), Rochina et al.
patent: 4308374 (1981-12-01), Vollbracht et al.

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