Claims
- 1. In a process for preparing an essentially linear, solvent soluble solid polyamideimide by the condensation of an organic diisocyanate with a compound containing one carboxylic acid group and one intramolecular anhydride group or the free carboxylic acids thereof in said solvent, the improvement which comprises adding to the solution of polyamideimide forming reactants 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 to claim 1 wherein the catalyst is an alkali metal salt of pyrrolidone.
- 4. The process of claim 1 wherein the polycarboxylic acid derivative comprises an aromatic tricarboxylic acid anhydride.
- 5. In a process for preparing an essentially linear, dipolar aprotic solvent soluble solid polyamideimide by the condensation of an organic diisocyanate with a compound containing one carboxylic acid group and one intramolecular anhydride group or the free carboxylic acids thereof in said solvent, the improvement which comprises adding to the solution of polyamideimide forming reactants a catalytic amount of an alkali metal salt of pyrrolidone at a temperature of from about 40.degree. C to about 140.degree. C.
- 6. The process according to claim 5 wherein the polycarboxylic acid derivative is trimellitic anhydride.
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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