发明授权
- 专利标题： Process for the preparation of carbonic acid aryl esters of polyester-diols lengthened via carbonate groups
- 专利标题（中）： 通过碳酸酯基团延长的聚酯二醇的碳酸芳酯的制备方法
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申请号： US886212申请日： 1978-03-13
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公开(公告)号： US4217297A公开(公告)日： 1980-08-12
- 发明人: Christian Lindner , Carlhans Suling , Herbert Bartl , Manfred Schreckenberg , Dieter Freitag , Klaus Konig
- 申请人： Christian Lindner , Carlhans Suling , Herbert Bartl , Manfred Schreckenberg , Dieter Freitag , Klaus Konig
- 申请人地址： DEX Leverkusen
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： DEX Leverkusen
- 优先权： DEX2712435 19770322
- 主分类号： C08G63/00
- IPC分类号： C08G63/00 ; C08G63/64 ; C08G63/66 ; C07C68/06 ; C08G63/62
摘要：
The present invention relates to a process for the preparation of bis-carbonic acid monoaryl esters of polyester-diols, lengthened via --OCOO-- groups, characterized in that polyester-diols with molecular weights Mn (number-average) of over 250, preferably over 600, are heated with carbonic acid bis-aryl esters at temperatures between about 100.degree. C. and 200.degree. C., preferably between about 110.degree. C. and 180.degree. C., in vacuo below about 35 mm Hg, preferably between about 25 and 1 mm Hg, in the presence of catalysts, less than one mol of carbonic acid bis-aryl ester being employed per mol of OH group of the polyester-diol and the hydroxyaryl compounds formed being distilled off.The invention further relates to the bis-carbonic acid aryl esters of polyester-diols lengthened via --OCOO-- groups.