发明授权
US06187884B1 Preparation of low molecular mass homopolymers of N-vinylpyrrolidone
失效
低分子量N-乙烯基吡咯烷酮均聚物的制备
- 专利标题： Preparation of low molecular mass homopolymers of N-vinylpyrrolidone
- 专利标题（中）： 低分子量N-乙烯基吡咯烷酮均聚物的制备
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申请号： US09104174申请日： 1998-06-25
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公开(公告)号： US06187884B1公开(公告)日： 2001-02-13
- 发明人: Stephan Kothrade , Rainer Blankenburg , Iris Peters , Axel Sanner
- 申请人： Stephan Kothrade , Rainer Blankenburg , Iris Peters , Axel Sanner
- 优先权： DE19727476 19970627
- 主分类号： C08F238
- IPC分类号： C08F238
摘要：
A process for preparing highly concentrated aqueous solutions of low molecular mass homopolymers of N-vinylpyrrolidone by free-radical solution polymerization in an aqueous medium with H2O2 as initiator comprises carrying out the polymerization in the presence of from 0.1 to 30% by weight, based on N-vinylpyrrolidone, of a polymerization regulator which is selected from the group consisting of C1-C6-alkanols, hydroxylamine salts and water-soluble compounds containing sulfur in bonded form.
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