Patent ID: 6624266
Filing Date: 2003-09-23
Classification: C08F,Y02P,Y10S

Abstract:
A method of making a polymer comprising contacting an &agr;-olefin monomer or monomers under gas-phase polymerization conditions in a gas-phase reactor with a liquid catalyst composition comprising a hydrocarbon solution of (a) an unsupported olefin polymerization catalyst compound and (b) a co-catalyst, characterized in that the hydrocarbon solvent is selected from the group consisting of aliphatic hydrocarbons, alicyclic hydrocarbons and mixtures thereof and the catalyst concentration in said liquid catalyst composition is from 0.04 to 0.1 mMolar and the catalyst compound is selected from the group consisting of racemic-dimethylsilylbis(2-methylindenyl)zirconium dichloride, racemic-dimethylsilylbis(2-methyl-4-(1-naphthyl)indenyl)zirconium dichloride, and racemic-dimethylsilylbis(2-methyl-4-phenylindenyl)zirconium dichloride.