Patent ID: 6075104
Filing Date: 2000-06-13
Classification: C08F,Y10S

Abstract:
A process for preparing syndiotactic polymers of vinylidene aromatic monomers comprising contacting one or more vinylidene aromatic monomers under polymerization conditions with a catalytically effective amount of a catalyst composition comprising:a) a Group 4 metal complex corresponding to the formula: ##STR3## wherein M is titanium;X independently each occurrence is hydrogen, halide R, or OR;R is C.sub.1-10 hydrocarbyl group;X' is a C.sub.4-40 conjugated diene;n is 1, 2 or 3;p is 1 when n is 0, and p is 0 when n is 2 or 3;R' each occurrence is independently selected from the group consisting of hydrogen, halogen, R, NR.sub.2, PR.sub.2 ; OR; SR or BR.sub.2, or one or two pairs of adjacent R' hydrocarbyl groups are joined together forming a fused ring system;b) an activating cocatalyst; andc) a hydrocarbylsilane or di(hydrocarbyl)silane adjuvant.