CATALYST FOR PRODUCING VINYL POLYMER AND PROCESS FOR PRODUCING VINYLAROMATIC POLYMER

摘要

A catalyst for producing vinyl polymers which comprises a combination of (A) a transition metal compound having a tetrasubstituted cyclopentadienyl group as a pi ligand, (B) an ionic compound comprising aluminoxane and/or a non-coordinating anion and a cation, and (C) a Lewis acid; and a process for producing a polymer of a vinylaromatic compound by using the above catalyst. The invention catalyst and process enable a highly syndiotactic, low-molecular polymer of a vinylaromatic compound such as styrene to be produced efficiently at a low production cost in a simplified manner.