| abstract |
This invention relates to a transition metal catalyst compound represented by the structure: n nwhereinn M is hafnium or zirconium;n each X is, independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halogens, dienes, amines, phosphines, ethers, or a combination thereof; n each R 1 and R 3 are, independently, a C 1 to C 8 alkyl group; and each R 2 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , and R 14 are, independently, hydrogen, or a substituted or unsubstituted hydrocarbyl group having from 1 to 8 carbon atoms, provided however that at least three of the R 10 -R 14 groups are not hydrogen, compositions thereof and methods of use thereof to prepare polymers. |