Patent ID: 6509439
Filing Date: 2003-01-21
Classification: C08G

Abstract:
A process for producing a polyamide comprising(a) contacting a dinitrile, a diamine, water, and optionally a catalyst to form a reaction mixture; (b) heating the reaction mixture to a first elevated temperature of between about 180 to about 240Â° C.; maintaining said temperature for about 0.10 to about 20 hours; and optionally controlling the pressure by venting of water; (c) heating the reaction mixture at the first elevated temperature to a second elevated temperature of between about 250 to about 350Â° C.; adding water to the reaction mixture before or after the second elevated temperature is reached; maintaining the pressure in step (c) above atmospheric pressure by venting at least some of the water; and maintaining the second elevated temperature for a period of about 0.10 to about 10 hours to produce a polyamide.