Patent ID: 8455597

Claim:
A process for making a vinyl terminated propylene polymer, wherein the process comprises: contacting propylene, under polymerization conditions, with a catalyst system comprising an activator and at least one metallocene compound represented by the formula: where: M is hafnium or zirconium; each X is, independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, dienes, amines, phosphines, ethers, and a combination thereof, (two X's may form a part of a fused ring or a ring system); each R 1 is, independently, methyl, ethyl, n-propyl, n-butyl, n-pentyl, isopentyl, n-hexyl, or isohexyl; each R 2 is, independently, methyl, ethyl, n-propyl, n-butyl, n-pentyl, isopentyl, n-hexyl, or isohexyl; each R 3 is hydrogen; each R 4 , R 5 , and R 6 , is, independently, hydrogen or a substituted hydrocarbyl or unsubstituted hydrocarbyl group, or a heteroatom; T is a bridging group represented by the formula R 2 a J, where J is Si, or Ge, and each R a is, independently, hydrogen, halogen, C 1 to C 20 hydrocarbyl or a C 1 to C 20 substituted hydrocarbyl, and two R a can form a cyclic structure including aromatic, partially saturated, or saturated cyclic or fused ring system; further provided that any of adjacent R 4 , R 5 , and R 6 groups may form a fused ring or multicenter fused ring system where the rings may be aromatic, partially saturated or saturated; and obtaining a propylene polymer having at least 50% allyl chain ends (relative to total unsaturations) and a Tg of 0° C. or less, wherein the activator comprises a non-coordinating anion.