Invention Grant
- Patent Title: Method for the stabilization of polyvinylpyrrolidones
- Patent Title (中): 稳定聚乙烯吡咯烷酮的方法
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Application No.: US11815478Application Date: 2006-02-08
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Publication No.: US08524827B2Publication Date: 2013-09-03
- Inventor: Karl Kolter , Ivette Garcia Castro , Olga Pinneker , Ralf Widmaier , Karl-Hermann Strube , Bernhard Fussnegger , Manfred Kroll , Frank Höfer , Hermann Ascherl , Peter Schmidt
- Applicant: Karl Kolter , Ivette Garcia Castro , Olga Pinneker , Ralf Widmaier , Karl-Hermann Strube , Bernhard Fussnegger , Manfred Kroll , Frank Höfer , Hermann Ascherl , Peter Schmidt
- Applicant Address: DE
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE
- Agency: Novak Druce Connolly Bove + Quigg LLP
- Priority: DE102005005974 20050209
- International Application: PCT/EP2006/050737 WO 20060208
- International Announcement: WO2006/084851 WO 20060817
- Main IPC: C08L39/06
- IPC: C08L39/06 ; C08K3/30 ; C08K13/02 ; C08K5/09
Abstract:
Method for stabilizing polyvinylpyrrolidones, which comprises treating the polyvinylpyrrolidones with sulfur dioxide, sulfurous acid or alkali metal sulfites and then with free-radical scavenger, and converting the solutions treated in this way into the powdered polyvinylpyrrolidones by drying.
Public/Granted literature
- US20080139724A1 Method For the Stabilization of Polyvinylpyrrolidones Public/Granted day:2008-06-12
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