Patent ID: 7449530

Claim:
A process for producing an elastomeric polypropylene copolymer, comprising: mixing together a diluent containing more than 10 weight percent of a fluorinated hydrocarbon based on the total weight of the diluent, a supported Ziegler-Natta catalyst system, and an olefin feed containing at least 25 weight % propylene and greater than 10 weight % ethylene, based on total weight of the feed, to provide a slurry; and forming an elastomeric polypropylene copolymer having a melting point of greater than or equal to 10° C., and wherein the diluent comprises a mixture of at least one saturated hydrocarbon and at least one fluorinated hydrocarbon wherein the mixture has a density in the range of from 0.2 g/cc less than to 0.2 g/cc greater than the density of the polymer.