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Process for the preparation of carbonic acid aryl esters of polyester- diols lengthened via carbonate groups

机译:制备通过碳酸酯基团延长的聚酯-二醇的碳酸芳基酯的方法

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° C. and 200° C., preferably between about 110° 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.P P The invention further relates to the bis-carbonic acid aryl esters of polyester-diols lengthened via --OCOO-- groups.
机译:本发明涉及通过--OCOO-基团延长的聚酯-二醇的双碳酸单芳基酯的制备方法,其特征在于分子量Mn(数均)超过250的聚酯-二醇,与碳酸双芳基酯一起,优选在超过600℃下,在约100℃至200℃之间,优选在约110℃至180℃之间的温度下加热。在催化剂存在下,在低于约35mm Hg,优选约25-1mm Hg的真空下,每摩尔聚酯-二醇的OH基团使用少于1摩尔的碳酸双芳基酯。

本发明进一步涉及通过-OCOO-基团加长的聚酯-二醇的双碳酸芳基酯。

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