Patent ID: 7122606

Claim:
A process for polymerizing at least one alpha-olefin comprising: continuously contacting at least one alpha-olefin with a metallocene-based catalyst system in a loop reactor at a temperature ranging from 25° C. to 70° C., wherein (i) the alpha-olefin and metallocene-based catalyst system is in a liquid medium; and (ii) an average residence time of the metallocene-based catalyst system is not more than 30 minutes; obtaining a prepolymerized metallocene-based catalyst system comprising a polymerization degree ranging from 60 to 500 g per gram of the metallocene-based catalyst system; continuously feeding the prepolymerized metallocene-based catalyst system into a polymerization reactor; polymerizing at least one alpha-olefin with the prepolymerized metallocene-based catalyst system.