Patent ID: 6136947
Filing Date: 2000-10-24
Classification: C08G,Y02P

Abstract:
A process permitting the production of either polyamide 6, polyamide 6.6 or copolyamide in the same equipment which comprises preheating starting material to be treated in the process, introducing the preheated material into a pressure reactor, effecting polymerization in the pressure reactor under the pressure, temperature and residence time appropriate for the product, wherein the pressure is controlled to a value less than 20 bar (gauge pressure) by regulating the amount of the water present in the material being polymerized and maintaining the temperature in the range from 150 to 280.degree. C., and postcondensing the polymerization product in at least one reactor at a pressure between 0 and 0.5 bar (gauge pressure) and a temperature in the range from 210 to 285.degree. C., while adjusting the amount of material in the postcondensation reactor by controlling the amount of water in that material and expelling water in excess of the amount which establishes a desired final viscosity of the product of the process.