Improved catalyst composition for preparing high-syndiotacticity polystyrene from styrene or other aryl ethylene monomers and processes using the same

摘要

A catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'₁R'₂R'₃R'₄ or TiR'₁R'₂R'₃, wherein R'₁, R'₂, R'₃ and R'₄ are, independently, an alkyl group, an aryl group, and alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by one of the following formulae wherein R₁, R₂, R₃ and R₄ are, independently, an alkyl group, an aryl group, a silyl group, a germanyl group, a stannyl group, or a halogen atom; R is an alkyl group, aryl group, a hydrogen atom, or a halogen element; and X can be one of the Group IVA elements of silicon (Si), germanium (Ge) or tin (Sn); and (c) an activated transitional metal co-catalyst which can be methyl aluminoxane, or a mixture containing a non-coordinated Lewis acid (a Lewis acid is an electron-pair donor) and a trialkyl aluminum, such as triethyl aluminum or tetraisobutyl aluminum.