| 摘要 |
The invention relates to novel propylene polymers with improved properties especially with improved stiffness and impact strength comprising propylene homopolymers or propylene block copolymers with 90.0 to 99.9 wt % propylene and 0.1 to 10 wt % alpha-olefins with 2 or 4 to 18 carbon atoms, or mixtures thereof, wherein the propylene homopolymers or propylene block copolymers are beta-nucleated propylene polymers, whereby the beta-nucleated propylene homopolymers have an Irtau>=0.98 and the values for tensile modulus and Charpy impact strength as specified herein. The beta-nucleated propylene block copolymers are polymers having an IRtau of the propylene homopolymer block of >=0.98 and the values for tensile modulus and Charpy impact strength as also specified herein. The propylene polymers with an improved property spectrum are suitable for producing molded parts in a pipe system, such as pipes and fittings, inspection chambers, pipe ducting systems, extrusion or compression molded sheets and the like.
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