Patent ID: 9556309
Date: 2017-01-31
CPC Classifications: C07C,C08G

Claim:
1. A method for producing a polyether monol or polyether polyol product, comprising polymerizing at least one alkylene oxide in the presence 2 to 100 parts per million of a double metal cyanide catalyst complex, based on the weight of the polyether monol or polyether polyol product, and at least one hafnium compound not present during the preparation of the double metal cyanide catalyst complex, which hafnium compound is selected from the group consisting of a hafnium alkyl; halnium tetramethoxide; hafnium tetraethoxide; hafnium tetraisopropoxide; hafnium tetra-t-butoxide; hafnium tatra-sec-butoxide; hafnium phenoxide; hafnium formate; hafnium acetate; hafnium propionate; hafnium 2-ethylhexanoate; hafnium benzoate; hafnium salicylate; hafnium 3.5-di-t-butyl salicylate; a hafnium phenoxide in which one or more of the phenoxide groups is ring-substituted with alkyl, CF 3 , cyano, COCH 3 , halogen, hydroxyl or alkoxyl; a hafnium amide; a hafnium alkoxide, wherein at least one alkoxide group of the hafnium alkoxide is a residue, after removal of at least one hydroxyl hydrogen, of a polyether monol or polyether polyol; and hafnium t-butylacetylacetonate, wherein the at least one hafnim compound is present in an amount sufficient to provide 0.005 to 0.25 moles of hafnium per gram of the double metal cyanide catalyst.