Method for preparing metal cyanide catalyst complexes using partially miscible complexing agents
AssigneeDow Global Technologies LLC
InventorRichard M. Wehmeyer
Life of this patent
Estimating the term…
Abstract
Metal cyanide catalysts are complexed with complexing agents that are miscible in poly(propylene oxide) at higher temperatures and immiscible at lower temperatures.
Claims9
A process wherein a double metal cyanide catalyst is mixed with an alkylene oxide and the resulting mixture subjected to conditions including an elevated temperature sufficient to polymerize the alkylene oxide to form a poly(alkylene oxide), wherein the double metal cyanide catalyst is complexed with a complexing agent which is miscible in the poly(alkylene oxide) at the elevated temperature, but which is not miscible in the poly(alkylene oxide) at a lower temperature at which the poly(alkylene oxide) is a liquid.
A process wherein a double metal cyanide catalyst is mixed with an ethylene oxide and the resulting mixture subjected to conditions including an elevated temperature sufficient to polymerize the alkylene oxide to form a poly(alkylene oxide), wherein the double metal cyanide catalyst is complexed with an immiscible complexing agent comprising a poly(ethylene oxide) polymer or block copolymer having poly(ethylene oxide) blocks and blocks of another monomer or monomers, wherein the immiscible complexing agent has a melting temperature between 25° C. and 150° C.
Dependencies are inferred from the claim text.