The invention relates to a process for the preparation of polycarbonates from oxiranes and CO2 characterized in that the polymerization is carried out in a single step in the presence of a chain transfer agent. Preferred chain transfer agents are polyols. The invention also relates to branched polycarbonates that have functional hydroxyl endgroups.
本发明涉及一种以
环氧乙烷和
二氧化碳为原料制备聚
碳酸酯的工艺,其特征在于聚合反应是在链转移剂存在下一步完成的。首选的链转移剂是多元醇。本发明还涉及具有官能羟基端基的支化聚
碳酸酯。