Phenolate Constrained Geometry Polymerization Catalyst and Methods for Preparing ( 96053)

Scientists at Northwestern University have created a unique constrained geometry catalyst (CGC) for olefin polymerization by a simple cost effective one step-synthesis. Upon activation with strong Lewis acid cocatalysts efficient polymerization of ethylene, propylene and styrene is realized.

ADVANTAGE: High olefin polymerization activity suitable for commercial production under ambient conditions. Improved catalyst preparation, stability and Ziegler-Natta polymerization activity are observed versus other CGC systems.

SUMMARY: A unique stable CGC catalytic complex (Ar’R4)(O)(Ar"R’4)M(CH2Ph)2 has been created in a direct one-step process for M = Ti, Zr. A new bifunctional mono Cp phenolate ligand provides catalyst steric and electronic flexibility. Solid and solution state characterization and chemistry were established. In the presence of cocatalysts {Ph3C+B(Ar3F)4-} or methyl alumoxane an efficient olefin polymerization catalyst at ambient conditions is produced. Thus ethylene (2.1 x 106 g /[mol cat-atm-h]), propylene (3.8 x 106 g /[mol cat-atm-h]), and styrene (4.3 x 107 g /[mol cat-mol styrene-h]) polymerization activities were realized in toluene solvent at 25°C. A variety of polymer properties can be realized with this catalytic system.

U.S. Patent No.5,856,258

Type of Offer: Licensing



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