发明授权
- 专利标题: Preparation of polyvinylpyrrolidone
- 专利标题(中): 聚乙烯吡咯烷酮的制备
-
申请号: US144744申请日: 1988-01-19
-
公开(公告)号: US4786699A公开(公告)日: 1988-11-22
- 发明人: Adolf Nuber , Siegfried Lang , Axel Sanner , Gerd Schroeder
- 申请人: Adolf Nuber , Siegfried Lang , Axel Sanner , Gerd Schroeder
- 申请人地址: DEX
- 专利权人: BASF Aktiengesellschaft
- 当前专利权人: BASF Aktiengesellschaft
- 当前专利权人地址: DEX
- 优先权: DEX3532747 19850913
- 主分类号: C08F4/00
- IPC分类号: C08F4/00 ; C08F4/28 ; C08F4/34 ; C08F26/00 ; C08F26/10 ; C08F20/44
摘要:
Polyvinylpyrrolidone having a Fikentscher K value of from 14 to 95 is prepared at from 50.degree. to 95.degree. C. in aqueous solution with hydrogen peroxide as starter, the solution being maintained at pH 7-11 by means of NaOH, KOH, their carbonates or bicarbonates.
公开/授权文献
- US5959316A Multiple encapsulation of phosphor-LED devices 公开/授权日:1999-09-28
信息查询