Patent ID: 6828395
Filing Date: 2004-12-07
Classification: C08F

Abstract:
A method of producing a polymer composition having a target I21 comprising incorporating a high molecular weight polymer into a low molecular weight polymer to form the polymer composition in a single gas phase polymerization reactor in the presence of polymerizable monomers, a bimetallic catalyst composition and at least one control agent; wherein the control agent is added in an amount sufficient to control the weight average molecular weight of the high molecular weight polymer, the level of low molecular weight polymer, or both;wherein the gas phase polymerization reactor comprises a fluidized bed and a fluidizing medium, the fluidizing medium comprising an alkane selected from the group consisting of C4 to C20 alkanes; and wherein as the amount of alkane increases in the reactor, the amount of control agent is increased in order to maintain the polymer composition at its target I21.