Patent ID: 8742039
Filing Date: 2014-06-03
Classification: C08F

Abstract:
1. A method for making a polyolefin composition, the method comprising: contacting one or more olefinic monomers in a single reactor containing a bicomponent catalyst system comprising a first catalyst component and a second catalyst component each having a catalyst productivity and a chain transfer agent response; the single reactor having a chain transfer agent concentration; the chain transfer agent response of the second catalyst component being different from that of the first catalyst component, wherein the bicomponent catalyst system comprises at least one Group 15 containing metal compound; effectuating the polymerization of the olefinic monomers to produce an olefin polymer having a melt flow ratio; wherein the first catalyst component produces a high molecular weight (HMW) fraction of the polymer, and the second catalyst component produces a low molecular weight (LMW) fraction of the polymer; altering the concentration of the chain transfer agent present in the reactor to move peaks of the HMW and LMW fractions of the polymer in a same direction, the altering also causing the melt flow ratio of the polymer to change in a first direction; adjusting at least one condition in the reactor to achieve a change in molecular weight split wherein the change in split causes the melt flow ratio of the polymer to reverse trend and change in a second direction and wherein the change in split maintains the flow index, I