Patent ID: 6355745
Filing Date: 2002-03-12
Classification: C08F

Abstract:
A process for preparing syndiotactic polymers from monovinylidene aromatic monomers comprising contacting one or more monovinylidene aromatic monomers under polymerization conditions with a catalytically effective amount of a catalyst composition comprising:a) a metal complex corresponding to the formula: â€ƒCpmMXnXâ€²p wherein:Cp is a single &eegr;5-cyclopentadienyl or &eegr;5-substituted cyclopentadienyl group, the substituted cyclopentadienyl group being optionally also bonded to M through a substituent X; M is a metal of Group 4 or the Lanthanide series of the Periodic Table; X each occurrence is an inert anionic ligand of up to 20 nonhydrogen atoms and optionally X and Cp are joined together; Xâ€² is an inert, neutral donor ligand; m and p are independently 0 or 1; n is an integer greater than or equal to 1; and the sum of m and n is equal to the oxidation state of the metal; b) an activating cocatalyst composition comprising an aluminoxane and an electrophilic borane compound.