| 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 IR tau >0.98, a tensile modulus >1500 MPa at +23 DEG C and a Charpy impact strength, ≥3 kJ/m<2> at -20 DEG C using notched test specimens, and the beta -nucleated propylene block copolymers are polymers having an IR tau of the propylene homopolymer block of >0.98, a tensile modulus ≥1100 MPa at +23 DEG C and a Charpy impact strength of >6kJ/m<2>, at -20 DEG C using notched test specimens. 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. |
