Polyalkylene glycol lubricant base oils with narrow molar mass distribution

摘要

The present invention provides a process for preparing polyalkylene glycols by reacting a mixture of a mono- or polyhydric alcohol and a polyalkylene glycol prepolymer with a C₂- to C₄-alkylene oxide or a mixture of such alkylene oxides in the presence of a catalyst which comprises Zn₃[Co(CN)₆]₂, the mono- or polyhydric alcohol having a molecular weight of up to 500 g/mol and containing from 1 to 20 carbon atoms and from 1 to 10 hydroxyl groups, and the polyalkylene glycol prepolymer being the addition product of a C₂- to C₄-alkylene oxide or of a mixture of such alkylene oxides in an amount of at least 500 g/mol to a mono- or polyhydric alcohol having from 1 to 20 carbon atoms and from 1 to 10 hydroxyl groups.