Patent ID: 7381780

Claim:
A process for making polyolefins, the process comprising contacting, in a reactor, ethylene and at least one comonomer selected from the group consisting of C 3 to C 8 alpha olefin in the presence of a supported catalyst system, the supported catalyst system comprising at least one titanium compound, at least one magnesium compound, at least one electron donor compound, at least one activator compound, and at least one silica support material, the at least one silica support material having a median particle size in the range of from 20 to 50 microns and an average pore diameter from 220 Angstroms to 265 Angstroms; wherein the at least one silica support material has no more than 10% of the particles having a size less than 10 microns and no more than 10% of the particles having a size greater than 50 microns.