| 摘要 |
A process for preparing syndiotactic vinyl aromatic polymers comprising contacting at least one polymerizable vinyl aromatic monomer under polymerization conditions with a catalyst comprising a compound corresponding to the formula:LmMXn+ RA-,wherein: L is a delocalized +529 -bonding group containing up to 50 nonhydrogen atoms; m is 0 or 1; M is a metal of Group 4 of the Periodic Table; X each occurrence is an inert, anionic ligand containing up to 20 nonhydrogen atoms; n is an integer greater than or equal to 1 and the sum of m and n is one less than the valence of M; and RA- is -RB(C6F5)3, where R is hydride, hydrocarbyl, silyl, a combination thereof or a substituted derivative thereof having up to 20 nonhydrogen atoms. Also included is a process for preparing the catalyst.
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