Abstract: Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst system solution by combining an aluminoxane with a metallocene having a substituent which has olefinic unsaturation in an aliphatic liquid to form a liquid catalyst system, conducting prepolymerization of an olefin in the liquid catalyst system, preferably in multiple stages, and separating the resulting solid metallocene-containing catalyst system from the reaction mixture. Also polymerization of olefins using the inventive solid catalyst system is disclosed.

Abstract: A number of process steps are provided that can be combined to produce bridged cyclopentadienyl-fluorenyl metallocenes. The process steps include production of a cyclopentadiene compound from dicyclopentadiene; production and recovery of a fulvene compound using the cyclopentadiene compound; production of a raw metallocene product using the fulvene compound; and recovery of the pure metallocene from the raw product.

Abstract: The present invention provides polymers of ethylene having ethyl branches, a narrow molecular weight distribution, no substantial amount of branches longer than any comonomer employed in the polymerization, and an unusually low branching to density ratio. In one embodiment the polyethylenes are substantially free of any branches having more than 2 carbon atoms, i.e. ethyl branches, and the molar percent of ethyl branches is substantially the same for molecular fractions across the molecular weight distribution. In another embodiment the polyethylenes have other branches having 3 or more carbons and the molar percent of the ethyl branches is substantially the same for molecular fractions across the molecular weight distribution.

Abstract: Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst system solution by combining an aluminoxane with a metallocene having a substituent which has olefinic unsaturation in a suitable liquid to form a liquid catalyst system, conducting prepolymerization of an olefin in the liquid catalyst system, and separating the resulting solid metallocene-containing catalyst system from the reaction mixture. Also polymerization of olefins using the inventive solid catalyst system is disclosed.

Abstract: Semiconductive elastomeric compositions useful as the outer layer on insulated electric cables and suitable for high temperature vulcanization techniques.