Patent ID: 6852660

Claim:
A solid prepolymerized catalyst system produced by a process comprising: (a) combining an organoaluminoxane dissolved in an aromatic liquid, at least one metallocene having at least one olefinically unsaturated substituent, and an aliphatic liquid to form a liquid catalyst system; (b) conducting prepolymerization of at least one olefin in the presence of the liquid catalyst system to produce a prepolymerized solid catalyst; and (c) separating the resulting solid from the liquid and components dissolved in the liquid, wherein the solid prepolymerized catalyst system has an activity greater than a second catalyst formed by polymerizing the at least one olefin in the presence of the organoaluminoxane, the at least one metallocene, and either the aromatic liquid or the aliphatic liquid; and wherein the activity of the solid prepolymerized catalyst system and the activity of the second catalyst are evaluated under like conditions.