The Dow Chemical Company

Kendra L Flagler

David E Laycock

Robert J Gulotty, Jr

Metal &lsqb;hexacyanocobaltate, cobalthexanitrite nitroferricyanide&rsqb; complexes are useful alkylene oxide polymerization catalysts. The metal is any that forms a precipitate with the hexacyanocobaltate, cobalthexanitrite and nitroferricyanide groups. These catalysts are made from less expensive raw materials than the common zinc hexacyanocobaltate catalysts, and provide short induction periods and many cases more controlled exotherms. In addition, the metal &lsqb;hexacyanocobaltate, cobalthexanitrite nitroferricyanide&rsqb; catalysts often provide poly(propylene oxide) polymers having very low unsaturations, even when the catalyst is complexed with a complexing agent such as glyme.

Complexing agent-modified trimetal cyanide catalyst

Metal hexacyanocobaltate nitroferricyanide catalysts are active polymerization catalysts for alkylene oxides. These catalysts tend to have short induction periods, followed by rapid polymerization of alkylene oxides to polyethers.

Metal hexacyanocobaltate nitroferricyanide complexes

Metal &lsqb;hexacyanometallate hexanitrometallate&rsqb; complexes are useful alkylene oxide polymerization catalysts. The metal is any that forms a precipitate with hexacyanometallate and hexanitrometallate groups. These catalysts are made from less expensive raw materials than the common zinc hexacyanocobaltate catalysts, and provide short induction periods and in many cases more controlled exotherms.

Complexing agent-modified hexacyanometallate hexanitrometallate catalysts

Metal cyanide catalysts are complexed with organic sulfone or sulfoxide compounds. The catalysts are active alkylene oxide polymerization catalysts that tend to have short induction periods and moderate exotherms.

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Fenelon Falls, Canada

Kendra L Flagler