发明授权
- 专利标题: Inhibition of catalytically active impurities in polycarbonate by the melt transesterification process
- 专利标题(中): 通过熔融酯交换法抑制聚碳酸酯中的催化活性杂质
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申请号: US11169101申请日: 2005-06-28
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公开(公告)号: US07250483B2公开(公告)日: 2007-07-31
- 发明人: Helmut-Werner Heuer , Melanie Möthrath , Peter Snobl , Lothar Bunzel , Thomas Pfingst , Marc Buts , Lydia Simon
- 申请人: Helmut-Werner Heuer , Melanie Möthrath , Peter Snobl , Lothar Bunzel , Thomas Pfingst , Marc Buts , Lydia Simon
- 申请人地址: DE Leverkusen
- 专利权人: Bayer MaterialScience AG
- 当前专利权人: Bayer MaterialScience AG
- 当前专利权人地址: DE Leverkusen
- 代理商 Joseph C. Gil; Aron Preis
- 优先权: DE102004032125 20040701; DE102004057348 20041127
- 主分类号: C08G64/00
- IPC分类号: C08G64/00
摘要:
An improvement to the melt transesterification process for the preparation of polycarbonate is disclosed. The improvement entails adding to the process between its medium viscosity reactor and a high viscosity reactor at least one bridged ester of organic sulphur-containing acid.