| abstract |
A polymerization catalyst containing (A) a transition metal compound represented by the general formula (I): L d MX e Y f Z x (wherein each symbol is as defined in the specification), (B) a compound which can form an ionic complex with the compound (A) or a derivative thereof and, if necessary; (C) an organoaluminum compound; and a process for producing polymers by homo- or copolymerizing monomers in the presence of the above catalyst. The catalyst has a high activity at a temperature at which the polymerization can be conducted efficiently in an industrial process, i.e., at 70-200°C or even thereabove. The use of this catalyst enables the production of (co)polymers having a large molecular weight, a controllable molecular weight distribution and a uniform composition. |