公开(公告)号：DE2730017A1

公开(公告)日：1979-01-18

申请号：DE2730017

申请日：1977-07-02

Applicant: BASF AG

Inventor： STRAUB FERDINAND DIPL CHEM DR ,  SPOOR HERBERT DIPL CHEM DR ,  SCHENCK HANS-UWE DIPL CHEM ,  SCHWARZ WOLFGANG DIPL CHEM DR

IPC: C08F2/00 ,  C08F2/04 ,  C08F4/00 ,  C08F4/28 ,  C08F4/32 ,  C08F6/00 ,  C08F6/06 ,  C08F6/10 ,  C08F26/00 ,  C08F26/06 ,  C08F26/10 ,  C08F218/00 ,  C08F218/02 ,  C08F218/04 ,  C08F218/08 ,  C08F226/06 ,  C08F226/10 ,  C08F263/02 ,  C08F271/00

Abstract: A process for reducing the residual monomer content of a copolymer prepared by copolymerizing vinyl esters and N-vinyl-lactams in a solvent in the presence of a free radical polymerization initiator. Following the main polymerization, from 0.05 to 0.5% by weight, based on the monomers employed, of di-tert.-butyl peroxide, di-tert.-amyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis-(tert.-butylperoxy)-hexane, 2,2-bis-(tert.-butylperoxy)-butane, 1,1-bis-(tert.-butylperoxy)-3,3,5-trimethylcyclohexane, 4,4-di-(tert.-butylperoxy)-butyl valerate, or a mixture of these, is added to the reaction mixture and the after-polymerization is carried out at a higher temperature than the main polymerization.