Patent ID: 6579965
Filing Date: 2003-06-17
Classification: C08G

Abstract:
A process for the anionic polymerization of lactams, comprising:(a) dissolving in molten lactam (i) a lactamate, a catalyst capable of creating a lactamate, or a combination thereof and (ii) a regulator chosen from amides of formula R1-NHâ€”CO-R2, in which R1 is unsubstituted or substituted by R3-COâ€”NHâ€”or R3-Oâ€” and in which R1, R2 and R3 are each independently aryl, alkyl or cycloalkyl, (a1) cooling the solution from stage (a) to the solid state in a form which can be divided, (a2) optionally reheating the product from stage (a1) to a temperature below the polymerization temperature of the lactam, (a3) optionally reheating the product from stage (a1) and maintaining the product from stage (a1) at a temperature between the melting temperature of the lactam and 15Â° C. above said melting temperature, (b) introducing the product from any one of stages (a1), (a2) or (a3) into a mixing device or into a mold and then heating said product to a temperature sufficient to obtain the bulk polymerization of the lactam.