Patent ID: 8809473
Filing Date: 2014-08-19
Classification: C08F

Abstract:
1. A method for altering the composition distribution of an ethylene copolymer, the method comprising: introducing a polymerization catalyst into a gas phase reactor, the polymerization catalyst comprising a phosphinimine catalyst, an inert support, and a cocatalyst; feeding a catalyst modifier into the reactor, the catalyst modifier comprising a compound having the formula: R polymerizing ethylene and an alpha-olefin in the reactor to give the ethylene copolymer; wherein the composition distribution of the ethylene copolymer is altered by changing the amount of the catalyst modifier fed to the reactor by at least 5 ppm from a first amount of catalyst modifier to a second different amount of catalyst modifier, wherein the amount of catalyst modifier fed to the reactor is from 0 to 100 ppm (based on the weight of copolymer produced);