Process for producing a styrenic polymer and a catalyst for use therein

摘要

There are disclosed a catalyst which comprises (A) a titanium compound having one pi electron-based ligand (e.g. pentamethylcyclopentadienyl group) or two same pi electron-based lignads and (B) an ionic compound comprising a non-coordinate anion and a cation of an element typifying the group 4 elements of the Periodic Table (e.g. triphenylcarbonium tetra(pentafluorophenyl)borate; a catalyst comprising (C) an alkylating agent (e.g. triisobutylaluminum) in addition to the components (A) and (B); and a process for producing a styrenic polymer by the use of any of the aforesaid catalysts. By using the aforementioned catalyst and process, a highly syndiotactic styrenic polymer can be efficiently produced.