发明授权
US4255557A Preparing polycarbonate oligomers by reacting phosgene with an aqueous
solution containing a salt of a dihydric phenol in an organic solvent
which comprises previously cooling the aqueous solution and carrying
out the reaction at a low temperature
失效
通过使光气与含有二元酚盐的水溶液在有机溶剂中反应来制备聚碳酸酯低聚物，其包括预先冷却该水溶液并在低温下进行反应
- 专利标题： Preparing polycarbonate oligomers by reacting phosgene with an aqueous solution containing a salt of a dihydric phenol in an organic solvent which comprises previously cooling the aqueous solution and carrying out the reaction at a low temperature
- 专利标题（中）： 通过使光气与含有二元酚盐的水溶液在有机溶剂中反应来制备聚碳酸酯低聚物，其包括预先冷却该水溶液并在低温下进行反应
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申请号： US81616申请日： 1979-10-03
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公开(公告)号： US4255557A公开(公告)日： 1981-03-10
- 发明人: Takeaki Megumi , Hiroyuki Yoshizaki , Sigeo Kondoh
- 申请人： Takeaki Megumi , Hiroyuki Yoshizaki , Sigeo Kondoh
- 申请人地址： JPX
- 专利权人： Mitsubishi Gas Chemical Company, Inc.
- 当前专利权人： Mitsubishi Gas Chemical Company, Inc.
- 当前专利权人地址： JPX
- 主分类号： C08G63/00
- IPC分类号： C08G63/00 ; C07C68/02 ; C08G64/22 ; C08G64/24 ; C08G63/62
摘要：
A process for preparing polycarbonate oligomers by reacting phosgene with an alkaline aqueous solution containing an alkali metal salt or alkaline earth metal salt of a dihydric phenol in the presence of an inert organic solvent, which comprises previously cooling said alkaline aqueous solution to not higher than 0.degree. C., reacting the cooled aqueous solution with phosgene to perform a phosgenation reaction and also to absorb the heat of the phosgenation reaction by the quantity of heat that said cooled aqueous solution has, thereby to adjust the phosgenation reaction system substantially to not higher than 10.degree. C., and then oligomerizing the phosgenation product at a temperature of 15.degree. C. or higher.
公开/授权文献
- USD426069S Back brush 公开/授权日：2000-06-06
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