METHOD FOR PRODUCING POLYCARBONATES WITH TERMINAL OH GROUPS

摘要

The present invention relates to a method for preparing compounds comprising terminal OH groups, wherein said method involves reacting diols comprising terminal CH2OH groups with dimethyl carbonate in the presence of a catalyst containing titanium. The methanol thus generated is continuously evacuated by distillation and the used catalyst is eventually deactivated. The selection of special parameters for the method and the substance, especially deactivation of the catalyst with a 1-20 % phosphoric acid solution, enables the production of products which are particularly well adapted to the preparation of linear polyurethane due to the profile of their properties.