Enhanced catalyst performance for production of vinyl terminated propylene and ethylene/propylene macromers

摘要

This invention relates to a transition metal catalyst compound represented by the structure:;
wherein
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, halogens, dienes, amines, phosphines, ethers, or a combination thereof;each R1 and R3 are, independently, a C1 to C8 alkyl group; andeach R2, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 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 R10-R14 groups are not hydrogen, compositions thereof and methods of use thereof to prepare polymers.

主权项

1. A propylene-ethylene copolymer having an Mn of more than 30,000 g/mol and up to 60,000 g/mol, and at least 90% allyl chain ends relative to total unsaturation; and wherein the polymer is produced with a single metallocene catalyst at a temperature within the range of 25 to 150° C. and a pressure within the range of 0.45 to 6 MPa.