METHOD OF PREPARING METALLOCENE CATALYSTS

摘要

Methods of preparing silica-supported catalysts useful for olefin polymerization are described. The catalysts comprise a metallocene complex. An activator mixture made from a boron acid compound and methylalumoxane is combined with either: (i) the metallocenecomplex, followed by calcined or chemically treated silica to give a supported catalyst; or (ii) calcined or chemically treated silica, followed by the metallocenecomplex to give a supported catalyst. The methods provide active supported catalysts.