Multi-metallic metallocene catalysts for polymerization of styrene and method of polymerization using the same

摘要

The metallocene catalyst of the present invention is a multi-metallic metallocene catalyst having three or four transition metals per one molecule, the metallocene catalyst having a structure of linking each ancillary ligand of the transition metal by a compound having two hydroxyl groups. The structure of the metallocene catalysts can be varied depending on the transition metal compound and the compound having two hydroxyl groups. The metallocene catalyst is employed with a co-catalyst for polymerization of styrene. One of the multi-metallic metallocene catalysts of the present invention is a trimetallic metallocene catalyst in which ancillary ligands of half metallocene compounds are connected each other. The trimetallic metallocene catalyst is prepared by (1) providing a bimetallic metallocene catalyst by reacting a half metallocene catalyst with a compound having two hydroxyl functional groups so that the hydroxyl functional groups are introduced to ancillary ligands of the half metallocene catalyst, and (2) reacting the bimetallic metallocene catalyst with a half metallocene catalyst. Another of the multi-metallic metallocene catalysts of the present invention is a tetrametallic metallocene catalyst in which ancillary ligands of half metallocene compounds are connected each other.