Process for preparing high molecular weight polyether polyols

摘要

The invention relates to a process for the preparation of polyether polyols with equivalent molecular weights of from 8,000 to 20,000 g/mol from one or more H-functional starter compounds and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxides are metered into the reactor in the course of from 15 to 23 h.

主权项

1. A process for preparing a polyether polyol with equivalent molecular weights of from 8,000 to 20,000 g/mol from at least one H-functional starter compound and at least one alkylene oxide in the presence of a double metal cyanide (DMC) catalyst, comprising metering said alkylene oxide into a reactor in a course of from 15 to 23 h and wherein, for calculating the equivalent molecular weight: Equivalent molecular weight=56,100/ (OH number [mg of KOH/g]).