发明公开
- 专利标题: METHOD OF PREPARING POLYCARBONATE
- 专利标题(中): 用于生产聚碳酸酯
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申请号: EP07798265.0申请日: 2007-06-08
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公开(公告)号: EP2052009A1公开(公告)日: 2009-04-29
- 发明人: JANSEN, Bernd , KAMPS, Jan, Henk , KUNG, Edward , MCCLOSKEY, Patrick, Joseph , SMIGELSKI, Paul, Michael, Jr.
- 申请人: GENERAL ELECTRIC COMPANY
- 申请人地址: 1 River Road Schenectady, NY 12345 US
- 专利权人: GENERAL ELECTRIC COMPANY
- 当前专利权人: GENERAL ELECTRIC COMPANY
- 当前专利权人地址: 1 River Road Schenectady, NY 12345 US
- 代理机构: Modiano, Micaela Nadia
- 优先权: US427885 20060630
- 国际公布: WO2008005648 20080110
- 主分类号: C08G64/14
- IPC分类号: C08G64/14 ; C08G64/30
摘要:
Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates in a transestenfication process have unfavorable properties with respect to color, hydrolytic stability and thermal stability, particularly when the polycarbonate containing such end groups is molded. The number of activated carbonate end groups formed during the melt transestenfication formation of polycarbonate can be reduced by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, in the presence of a monohydroxy chainstopper such as para-cumyl phenol in an amount that results in 35 to 65 mol% of the end groups being derived from the monohydroxy chainstopper. Suitably, the reactants are provided such that the molar ratio of activated diaryl carbonate to the total of dihydroxy compound plus 1/2 the chainstopping reagent that is less than 1.
公开/授权文献
- EP2052009B1 METHOD OF PREPARING POLYCARBONATE 公开/授权日:2012-12-19
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