Catalyst system for the (co) polymerization of olefins

摘要

The present invention relates to a catalyst system for the (co)polymerization of propylene consisting of the following components:(A) a solid catalyst component comprising titanium, magnesium, halogen and a 1,3-diether; (B) an organic aluminum compound; and optionally (C) an organic silicon compound. In comparison with the prior art, stereospecificity of the polymer prepared by using the catalyst system of this invention even containing no external electron-donor is greater than 99%. Also, the activity of the catalyst system and hydrogen gas adjustability on the molecular weight of the polymer do not significantly decrease.