Patent ID: 9115224
Filing Date: 2015-08-25
Classification: C08F

Abstract:
1. A catalyst system having an activity greater than 1,500 g of polymer per gram of supported catalyst per hour normalized to 1,379 kPag (200 psig) of ethylene partial pressure and a temperature of 90° C. in the presence of 1-hexene comonomer and having a kinetic profile for a plot of ethylene consumption in standard liters of ethylene per minute against time in minutes, at a reaction pressure of 1,379 kPag (200 psig) and 90° C., corrected for the volume of ethylene in the reactor prior to the commencement of the reaction, in a 2 liter reactor over a period of time from 0 to 60 minutes such that the ratio of the maximum peak height over the first 10 minutes to the average ethylene consumption from 10 to 60 minutes taken at not less than 40 data points, of less than 2.5, comprising: (i) an alumina support having an average particle size from 10 to 150 microns, a surface area greater than 100 m (ii) at least a 1 weight % of Zr(SO (iii) from 10 to 60 weight % of an aluminum activator based on the weight of said alumina support, said activator having the formula: wherein each R (iv) from 0.1 to 30 weight % of a phosphinimine catalyst of the formula: wherein M is a group 4 metal having an atomic weight less than 179; PI is a phosphinimine ligand of the formula wherein each R 21 is independently selected from the group consisting of a hydrogen atom; a halogen atom; and C 1-10 hydrocarbyl radicals which are unsubstituted by or further substituted by a halogen atom; L is a monoanionic ligand selected from the group consisting of a cyclopentadienyl radical which is unsubstituted or substituted by a substituent selected from the group consisting of a C 1-6 alkyl radical which is substituted by 2n+1 fluorine atoms where n is the number of carbon atoms in the alkyl radical, and a C 6 F 5 radical which cyclopentadienyl ligand is optionally further substituted with up to two C 3-6 alkyl radicals in the 2 or 3 position relative to the fluorine containing substituent; Y is an activatable ligand; m is 1 or 2; q is 1; and p is an integer and the sum of m+q+p equals the valence state of M.