| abstract |
In olefin polymerization, an alumoxane or boric acid is unnecessary, and an olefin is polymerized by a heterogeneous metallocene catalyst. As a catalyst composition useful for polymerizing at least one monomer, 1) contacting at least one solid oxide with at least one electron-withdrawing anion source. A composition comprising a treated solid oxide compound, 2) a Group IVA metallocene compound and 3) an organoaluminum compound produced by [Selection figure] None |