Transition metal compounds having conjugate aluminoxate anions a

Details Transition metal compounds having conjugate aluminoxate anions a Transition metal compounds having conjugate aluminoxate anions a

1998-10-23

2000-12-12

Nazario-Gonzalez, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 11, 556 12, 556 28, 526127, 526160, 526943, 502103, 502117, 502153, C07F 1700, C07F 1900, C07F 506, C07F 700

Patent

active

061601454

ABSTRACT:
Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extememly high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts.

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