发明授权
- 专利标题: Method of polycarbonate preparation
- 专利标题(中): 聚碳酸酯制备方法
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申请号: US10167965申请日: 2002-06-12
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公开(公告)号: US06723823B2公开(公告)日: 2004-04-20
- 发明人: Patrick Joseph McCloskey , Warren William Reilly , Brian James Grimmond
- 申请人: Patrick Joseph McCloskey , Warren William Reilly , Brian James Grimmond
- 主分类号: C08G600
- IPC分类号: C08G600
摘要:
Mixed alkali metal salts of phosphoric acid in combination with a co-catalyst such as tetramethylammonium hydroxide (TMAH) are excellent transesterification catalysts for use in the preparation of polycarbonate from bisphenol A and diphenyl carbonate. The mixed alkali metal phosphate salts were shown by kinetic measurements made on a model system composed of p-tert-octylphenol and bis(p-cumylphenyl) carbonate to be inherently more potent catalysts than salts of phosphoric acid comprising a single alkali metal ion. In addition to providing higher rates of polymerization, the new catalysts were shown to provide polycarbonates containing reduced levels of Fries rearrangement product relative to polymerization reactions catalyzed by conventional catalyst systems such as sodium hydroxide together with TMAH co-catalyst.
公开/授权文献
- US20030236383A1 Method of polycarbonate preparation 公开/授权日:2003-12-25
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