公开(公告)号：US3859245A

公开(公告)日：1975-01-07

申请号：US33315873

申请日：1973-02-16

Applicant: BAYER AG

Inventor： STIELER WERNER ,  OELMEYER ROLF ,  HAUPT HEINRICH ,  VERNALEKEN HUGO

IPC: D01F6/64 ,  C08G64/40 ,  C08G53/00 ,  C08G51/30

CPC classification number: C08G64/40

Abstract: The invention is related to the production of the solution of a high molecular weight polycarbonate having a molecular weight above 30,000 suitable for the production of films and filaments. The process comprises subjecting the solid polycarbonates solutions obtained by solvent removal from polycarbonate solutions at temperatures below the melting point of said polycarbonate coupled with the application of shear energy for 0.1 to 50 hours to a solvent atmosphere of solvents which are able to dissolve polycarbonates and subsequently redissolving the thus obtained products.