Patent ID: 7053250

Claim:
A method of producing a polyether polyol, said method comprising: synthesizing a double metal cyanide (DMC) catalyst by combining and sonicating a solution of a first metal salt of the general formula M(X) m , a solution of a second metal salt of the general formula N(Y) n , and a solution of an alkali metal cyanide wherein; M is selected from the group consisting of aluminum, zinc, and the transition metals, X is an anion selected from the group consisting of halides, hydroxides, sulfates, carbonates, cyanides, oxalates, thiocyanates, isocyanates, isothiocyanates, carboxylates, and nitrates, m is a value from 1 to 3 satisfying the valency state of M, N is selected from the group consisting of the transition metals and the lanthanides, Y is an anion selected from the group consisting of halides, hydroxides, sulfates, carbonates, cyanides, oxalates, thiocyanates, isocyanates, isothiocyanates, carboxylates, and nitrates, and n is a value from 1 to 3 satisfying the valency state of N; and polymerizing an alkylene oxide in the presence of an initiator and the DMC catalyst.