Patent ID: 8501882

Claim:
A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising: (i) introducing a transition metal-based catalyst composition, an olefin monomer, and optionally an olefin comonomer into a polymerization reactor within the polymerization reactor system, wherein the transition metal-based catalyst composition comprises (a) a transition metal compound; (b) an activator-support comprising a solid oxide treated with an electron-withdrawing anion; and (c) optionally, a co-catalyst; (ii) contacting the transition metal-based catalyst composition with the olefin monomer and the optional olefin comonomer under polymerization conditions to produce an olefin polymer; and (iii) introducing a synergistic amount of hydrogen and an organozinc compound into the polymerization reactor system to reduce a weight-average molecular weight (Mw) and/or to increase a melt index (MI) of the olefin polymer.