Importance

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Abstract

The reaction product of the reaction product of A.) a ligand of the formula (I), wherein R¹, R², R³, and R⁴ in each occurrence independently are the same or different hydrocarbyl substituents of 1 to 20 carbon atoms, hydrogen, halogen, or alkoxy groups of 1 to 8 carbon atoms; X in each occurrence independently is CR⁶ with R⁶ being hydrogen or an alkyl group of 1 to 8 carbon atoms; and R⁵ is an organic divalent group of 4 to 40 carbon atoms with the proviso that the two nodes X are not bound to the same atom or to vicinal atoms in the group R⁵; B.) an aluminum compound of the formula AlR⁷R⁸R⁹, wherein R⁷, R⁸ and R⁹ each independently is a C₁ to C₁₂ hydrocarbyl group, hydrogen, halogen, or an alkoxy group of 1 to 20 carbon atoms; and C.) a Lewis base selected from the group consisting of amines, phosphines, amides, nitriles, isonitriles, and alcohols is useful as a polymerization catalyst, particularly for the homopolymerization or copolymerization of an alkylene oxide.

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First Claim