| 摘要 |
SUPPORTED CATALYST SYSTEMS ARE PROVIDED COMPRISING (A) A TRANSITION METAL COMPOUND, (B) AN ACTIVATOR COMPRISING (III) AN ALUMINOXANE OR (IV) A GROUP IIIA METAL OR METALLOID COMPOUND, AND (C) A SUPPORT MATERIAL COMPRISING AN INORGANIC METAL OXIDE, INORGANIC METAL HALIDE OR POLYMERIC MATERIAL OR MIXTURES THEREOF CHARACTERIZED IN THAT THE SUPPORT MATERIAL HAS BEEN PRETREATED WITH A SOURCE OF A TRANSITION METAL ATOM. THE PREFERRED TRANSITION METAL COMPOUNDS ARE METALLOCENES AND THE SOURCE OF THE TRANSITION METAL ATOM IS TYPICALLY A FERROUS OR CUPRIC METAL SALT. THE SUPPORTED CATALYST SYSTEMS SHOW IMPROVED ACTIVITY AND ALSO MAY REDUCE FOULING IN GAS PHASE FLUIDISED BED PROCESSES.
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