| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymer having a good bulk specific gravity through a preparation process of a polyolefin using a catalyst system exerting a high activity. SOLUTION: A catalyst for polymerizing olefins comprising (a) a prepolymerization catalyst prepared by bringing a solid component, obtained by prepolymerizing olefins using a catalytic component comprising a metallocene compound, an aluminoxane compound and an inorganic particle carrier, into contact with a protonic acid, (b) an organic aluminum compound and (c) a non-coordination ionizing compound is used to polymerize olefins.
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