Patent ID: 6051668
Filing Date: 2000-04-18
Classification: C07F,C08F,Y10S

Abstract:
A bidentate coordinated catalyst composition for producing a syndiotactic vinyl aromatic polymer, comprising:(a) a bidentate coordinated metal complex represented by the following formula (I):(C.sub.5 R.sub.n H.sub.5-n)M(BD).sub.m Y.sub.p (I)wherein:C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopentadienyl group, n is an integer between 0 and 5, and R is a C.sub.1 to C.sub.12 alkyl, aryl, substituted alkyl, or substituted aryl;M is a trivalent Group IVB metal;(BD) is a bidentate ligand with a -1 valence, having a coordinating group which is capable of forming a coordinating bond or a chelating bond with the metal M;Y is selected from the group consisting of alkyl, aryl, aralkyl, halogen, and hydrogen;m is an integer of 1 or 2;m+p=2; and(b) an activating cocatalyst selected from the group consisting of methyl aluminoxane (MAO), trialkyl aluminum, dialkyl aluminum, salts of an inert and non-coordinating anion, and mixtures thereof.