| 摘要 |
A catalyst solid comprising: A) support particles having a mean particle diameter d50 of from 5 to 200 mum and a specific surface area of from 30 to 1 000 m<2>/g and obtainable by agglomeration of primary particles of a pyrogenic silica having a mean particle diameter dm of from 1 to 50 nm, and B) at least one organic transition metal compound, can be used for the polymerization or copolymerization of olefins.
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