Patent ID: 8008412

Claim:
A process to polymerize olefins comprising contacting propylene, at a temperature of 65° C. to 150° C. and a pressure between 1.72 MPa and 34.5 MPa, with: 1) a catalyst system comprising one or more activators and one or more nonmetallocene metal-centered, heteroaryl ligand catalyst compounds, where the metal is chosen from the Group 4, 5, 6, the lanthanide series, or the actinide series of the Periodic Table of the Elements, 2) 0 to 20 wt % of one or more comonomers (based upon the weight of all monomers and comonomers present in the feed) selected from the group consisting of ethylene and C4 to C12 olefins, 3) from 20 to 65 wt % diluent or solvent, based upon the total weight of the feeds to the polymerization reactor, and 4) 0 to 5 wt % scavenger, based upon the total weight of the feeds to the polymerization reactor, wherein: a) the olefin monomers and any comonomers are present in the polymerization system at 15 wt % or more, b) the propylene is present at 80 wt % or more based upon the weight of all monomers and comonomers present in the feed, and c) the polymerization occurs at a temperature above the solid-fluid phase transition temperature of the polymerization system and a pressure greater than 1 MPa below the cloud point pressure of the polymerization system, and d) the polymerization occurs: (1) at a temperature below the critical temperature of the polymerization system, or (2) at a pressure below the critical pressure of the polymerization system.