| 主权项 |
1. A process comprising contacting:
(a) an activated bridged racemic metallocene compound of Formula 1: wherein M is selected from Zr, Hf, Ti; each X is independently selected from the group consisting of halide and hydrogen, branched or unbranched C1 to C20 hydrocarbyls, L1 and L2 are independently selected from cyclopentadienyl, indenyl, tetrahydroindenyl, and their alkyl substituted analogs, and A is selected from R1R2Si, R1R2C, (R1R2C)2, (R1R2Si)2; wherein R1 and R2 are independently selected from hydrogen, branched or unbranched C1 to C20 hydrocarbyl radicals, phenyl, and substituted phenyl; (b) a non-coordinating anion activator; (c) a co-activator; and (d) a monomer feed comprising at least two different linear alpha-olefin monomers selected from C4 to C24 linear alpha-olefins having an average carbon number of from 5 to less than 12 and under conditions suitable to produce an isotactic polyalpha-olefin comprising the at least two different linear alpha-olefin monomers,
with the proviso that any one of ethylene and propylene, if present in the at least two different linear alpha-olefin monomers, is present in the amount of less than 5 wt % individually or combined based on the total weight of alpha-olefin monomers; wherein the isotactic polyalpha-olefin has:
(1) a randomness factor between 0.7 and 1.4 as determined by mass spectrometry;(2) a molecular weight distribution Mw/Mn of 1 to 4 as measured by GPC using polystyrene as a calibration standard;(3) a pour point less than 0° C. as measured by ASTM D 97;(4) a kinematic viscosity KV at 100° C. of 3 to 1000 cSt as measured by ASTM D 445; and(5) a VI from 100 to 300 as determined according to ASTM D2270-93 (1998). |
