Claims
- 1. In a process for preparing an essentially linear, solvent soluble solid polyamide by the condensation of an organic diisocyanate with a compound containing two carboxylic acid groups in said solvent, the improvement which comprises preparing said polyamide in the presence of a catalytic amount of a compound
- wherein n is an integer from 2 to 5 inclusive, and M is an alkali metal at a temperature of from about 40.degree. C to about 140.degree. C.
- 2. The process according to claim 1 wherein the solvent comprises a dipolar aprotic solvent.
- 3. The process according the claim 1 wherein the catalyst is an alkali metal salt of pyrrolidone.
- 4. The process according to claim 1 wherein the polycarboxylic acid derivative comprises an aromatic dicarboxylic acid.
- 5. The process according to claim 1 wherein the polycarboxylic acid derivative comprises an aliphatic dicarboxylic acid.
- 6. In a process for preparing an essentially linear, dipolar aprotic solvent soluble solid polyamide by the condensation of an organic diisocyanate with a compound containing two carboxylic acid groups in said solvent, the improvement which comprises preparing said polyamide in the presence of a catalytic amount of an alkali metal salt of pyrrolidone at a temperature of from about 40.degree. C to about 140.degree. C.
- 7. The process according to claim 6 wherein the polycarboxylic acid derivative is isophthalic acid.
- 8. The process according to claim 6 wherein the polycarboxylic acid derivative is brassylic acid.
CROSS REFERENCE TO RELATED APPLICATION
This application is a division of copending application Ser. No. 521,745 filed Nov. 7, 1974, now U.S. Pat. No. 4,021,412.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
521745 |
Nov 1974 |
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