公开(公告)号：EP1851269B1

公开(公告)日：2010-06-09

申请号：EP06708084.6

申请日：2006-02-08

Applicant: BASF SE

Inventor： KOLTER, Karl ,  GARCIA CASTRO, Ivette ,  PINNEKER, Olga ,  WIDMAIER, Ralf ,  STRUBE, Karl-Hermann ,  FUSSNEGGER, Bernhard ,  KROLL, Manfred ,  HÖFER, Frank ,  ASCHERL, Hermann ,  SCHMIDT, Peter

IPC: C08K3/30 ,  C08K5/04 ,  C08L39/06

CPC classification number: C08K5/005 ,  C08F6/06 ,  C08K3/30 ,  C08K5/1535 ,  C08K2003/309 ,  C08K2201/014 ,  C08L39/06

Abstract: Disclosed is a method for stabilizing polyvinylpyrrolidones, which is characterized in that the polyvinylpyrrolidones are treated with sulfur dioxide, sulfurous acid, or alkali metal sulfites and then with radical absorber, and the treated solutions are transformed into the powdered polyvinylpyrrolidones by means of drying.