Patent ID: 7781363

Claim:
A catalyst composition comprising: a procatalyst composition; a cocatalyst; a selectivity control agent (SCA) comprising one or more silicon containing compounds; and an activity limiting agent (ALA) selected from the group consisting of (poly)(alkylene glycol) mono- or di-acetates, (poly)(alkylene glycol) mono- or di-myristates, (poly)(alkylene glycol) mono- or di-laurates, (poly)(alkylene glycol) mono- or di-oleates, glyceryl tri(acetate), and mixtures thereof, said ALA and amount being selected such that the normalized polymerization activity of the catalyst composition at a temperature from 85 to 130° C., is less than the normalized polymerization activity of the catalyst composition in the presence of only the SCA compound at the same total molar quantity of SCA at said temperature.