Patent ID: 9127094
Filing Date: 2015-09-08
Classification: C08F,Y10S

Abstract:
1. A polymerization process to make an ethylene copolymer, the process comprising contacting ethylene and at least one alpha olefin with a polymerization catalyst in a gas phase reactor, the polymerization catalyst comprising: i) a phosphinimine catalyst, ii) an inert support, iii) a cocatalyst, and iv) a catalyst modifier; wherein the catalyst modifier is present in from 0.25 to 6.0 weight percent based on the weight of i), ii) and iii) of the polymerization catalyst and comprises a compound having the formula: R wherein the phosphinimine catalyst has the formula: (L)((t-Bu) wherein the process further comprises feeding the catalyst modifier to the gas phase reactor in an amount of 50 ppm or less based on the weight of the ethylene copolymer produced.