公开(公告)号：US3642974A

公开(公告)日：1972-02-15

申请号：US3642974D

申请日：1970-07-02

Applicant: BASF AG

Inventor： JACOBI HANS-RUDOLF ,  HAUSER ABEL ,  HOFFMANN MANFRED

IPC: B29C39/00 ,  B29C39/40 ,  C08G69/18 ,  B29G1/00

CPC classification number: C08G69/18 ,  B29C39/006 ,  B29C39/40 ,  B29K2077/00 ,  B29K2105/0002

Abstract: A PROCESS FOR THE MANUFACTURE OF POLYAMIDE MOLDINGS BY ACTIVATED ANIONIC POLYMERIZATION OF LACTAMS IN A COMPRESSION MOLD HEATED TO THE TEMPERATURE OF POLYMERIZATION AND PROVIDED WITH A PLUNGER, THE PROCESS COMPRISING CHARGING THE MOLD WITH A MELT OF LACTAM, ACTIVATOR AND CATALYST IN AN AMOUNT SUCH AS IN REQUIRED FOR THE PRODUCTION OF THE MOLDING, IMMERSING THE PLUNGER IN THE MELT SO THAT THE LATTER COMPLETELY FILLS THE MOLD, COMPENSATING FOR

CONTRACTION OF THE MELT DURING POLYMERIZATION BY ADVANCING THE PLUNGER WITHOUT APPLYING PRESSURE TO THE MELT, AND, WHEN NO FURTHER CONTRACTION TAKES PLACE, CLOSING THE MOLD UNDER PRESSURE AND THUS GIVING THE POLYMER ITS FINAL SHAPE.