Patent ID: 8440772

Claim:
A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising: (i) introducing a transition metal-based catalyst system, an olefin monomer, and optionally an olefin comonomer into a polymerization reactor within the polymerization reactor system; (ii) contacting the transition metal-based catalyst system with the olefin monomer and the optional olefin comonomer under polymerization conditions to produce an olefin polymer; and (iii) introducing a catalyst deactivating agent into the polymerization reactor system to partially or completely terminate the polymerization reaction in the polymerization reactor system; wherein the catalyst deactivating agent comprises a polyethylene glycol, a polypropylene glycol, a compound having formula (I), or a combination thereof, wherein formula (I) is: R 1 —X 1 —R 3 —X 2 —R 2 (I); wherein: X 1 and X 2 independently are O, S, or NR, wherein R is hydrogen or a C 1 to C 18 hydrocarbyl group; R 1 and R 2 independently are hydrogen or a C 1 to C 18 hydrocarbyl group; and R 3 comprises up to 18 carbon atoms and is (i) a substituted or unsubstituted chain of at least two contiguous carbons atoms, one end of which is bonded to X 1 and the other end of which is bonded to X 2 , or (ii) a substituted or unsubstituted ether, thioether, or amine group having at least four carbon atoms, a two-carbon atom end of which is bonded to X 1 and the other two-carbon atom end of which is bonded to X 2 .