| 摘要 |
The present invention relates to catalysts systems for the polymerization of olefins CH2═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a mono or dihalogenated hydrocarbon compound. Said catalyst systems have improved polymerization activity.
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