Patent ID: 8802584

Claim:
A catalyst system having an activity greater than 1,300 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 6, comprising: (i) an inorganic oxide support having an average particle size from 10 to 150 microns, a surface area greater than 100 m 2 /g, and a pore volume greater than 0.3 ml/g impregnated with (ii) at least 1 weight % Zr(SO 4 ) 2 .4H 2 O, based on the weight of the inorganic oxide support; (iii) from 10 to 60 weight % of an aluminum activator based on the weight of said inorganic oxide support, said activator having the formula: R 12 2 AlO(R 12 AlO) q AlR 12 2 wherein each R 12 is independently selected from the group consisting of C 1-20 hydrocarbyl radicals and q is from 3 to 50; and (iv) from 0.1 to 30 weight % of a catalyst of the formula: wherein M is a group 4 metal having an atomic weight less than 179; Pl 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; C 1-10 hydrocarbyl radicals which are unsubstituted by or further substituted by a halogen atom; H is a heteroligand characterized by (a) containing a heteroatom selected from N, S, B, O or P; and (b) being bonded to M through a sigma or pi bond with the proviso that H is not a phosphinimine ligand as defined above or a ketamide ligand; L is an activatable ligand; n is 1, 2 or 3 depending upon the valence of M with the proviso that L is not a cyclopentadienyl, indenyl or fluorenyl ligand.