Patent ID: 8680002

Claim:
A double metal cyanide catalyst, represented by formula (I): M a [M′(CN) 6 ] b L c L′ d (I) wherein, M is a metal element selected from the group consisting of Zn(II), Fe(II), Ni(II), Mn(II), Co(II), Sn(II), Pb(II), Fe(III), Mo(IV), Mo(VI), Al(III), V(V), V(IV), Sr(II), W(IV), W(VI), Cu(II), and Cr(III); M′ is a metal element selected from the group consisting of Fe(II), Fe(III), Co(II), Co(III), Cr(II), Cr(III), Mn(II), Mn(III), Ir(III), Ni(II), Rh(III), Ru(II), V(V), and V(IV); L is a first complexing agent, said first complexing agent being an ether having a molecular weight of less than 200; L′ is a second complexing agent, said second complexing agent being a mixture of an ether having a molecular weight of less than 200 and a glycol having a molecular weight of less than 200; and a, b, c and d are each independently an integer, the sum of which is equal to the sum of the charges of M and M′, wherein the glycol is selected from the group consisting of propylene glycol, dipropylene glycol, tripropylene glycol, ethylene glycol, diethylene glycol, and a mixture thereof.