Improved double metal cyanide catalysts for producing polyether polyols

The invention relates to new, improved double metal cyanide (DMC) catalysts for preparing polyetherpolyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a double metal cyanide compound, an organic coordination ligand and 5 to 80 wt. %, with respect to the amount of catalyst, of an ethylene oxide polyether with a number average molecular weight greater than 500. The new, improved catalysts have a greatly increased reactivity for polyetherpolyol preparation.