Zinc catalyst/additive system for the polymerization of epoxide monomers
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United States of America Patent
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Jan 30, 2018
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Nov 18, 2014
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Nov 22, 2013
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Abstract
The present invention concerns a catalyst formulation comprising: (a) a Zn catalyst comprising a Zn compound having alcoholate ligand(s) derived from one or more polyols, and (b) a catalyst additive comprising a metal compound (i) having alcoholate ligand(s) derived from one or monohydric alcohol wherein the metal is selected from: (I) first row transition metals excluding Zn, preferably Sc, Ti, V, Cr, Mn, Ni, and Co, more preferably Ti, (II) second row transition metals, preferably Y and Zr, more preferably Zr, and (III) combinations of at least two metals selected from (I) and (II). The present invention also relates to a process for polymerizing an epoxide monomer, preferably ethylene oxide, comprising carrying out the process in the presence of the catalyst formulation.
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