METHOD FOR PRODUCING LONG-CHAIN POLYETHERPOLYOLS WITHOUT REPROCESSING

摘要

The invention relates to a method for producing long-chain polyetherpolyols without reprocessing. Oligomeric alkoxylated initiation compounds with molecular weights of between 200 and 1000 are obtained first from low-molecular initiators by catalysis with perfluoroalkyl sulfonates of metals of Group III A of the periodic table (in accordance with the IUPAC Convention of 1970), through reaction with alkylene oxides at reaction temperatures of 80 to 200C and with concentrations of the catalyst of 5 to 200 ppm. Said initiation compounds are then reacted with alkylene oxides to produce higher-molecular long-chain polyether polyols without being reprocessed and without the catalyst being separated, using highly active DMC catalysts, the concentration of catalysts being 30 ppm or less in relation to the quantity of polyether polyol to be produced.