Patent ID: 6855658

Claim:
A hydroxide containing double metal cyanide (DMC) catalyst of the formulae (I) or (II), M 1 x [M 2 (CN) 6 ] y OH.L (I) M 1 x [M 2 (CN) 6 ] y .zM 1 (OH) q .L (II) wherein M 1 represents a metal selected from the group consisting of Zn +2 , Fe +2 , Ni +2 , Mn +2 , Co +2 , Sn +2 , Pb +2 , Fe +3 , Mo +4 , Mo +6 , Al +3 , V +4 , V +5 , Sr +2 , W +4 , W +6 , Cu +2 and Cr +3 , M 2 represents a metal selected from the group consisting of Fe +2 , Fe +3 , Co +2 , Co +3 , Cr +2 , Cr +3 , Mn +2 , Mn +3 , Ir +3 , Ni +2 , Rh +3 , Ru +2 , V +4 and V +5 , L represents an organic ligand, x, y, and q are chosen to maintain electroneutrality, and wherein the catalyst is crystalline.