Abstract: 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 % &agr;-olefins with 2 or 4 to 18 carbon atoms, or mixtures thereof, wherein the propylene homopolymers or propylene block copolymers are &bgr;-nucleated propylene polymers, whereby the &bgr;-nucleated propylene homopolymers have an IR&tgr;≧0.98, a tensile modulus ≧1500 MPa at +23° C. and a Charpy impact strength, ≧3 kJ/m2 at −20° C. using notched test specimens, and the &bgr;-nucleated propylene block copolymers are polymers having an IR&tgr; of the propylene homopolymer block of ≧0.98, a tensile modulus ≧1100 Mpa at +23° C. and a Charpy impact strength of ≧6 kJ/m2 at −20° C. using notched test specimens.