Patent ID: 8389089

Claim:
Propylene polymer single- or multilayer pipes and pipe components for pipelines having improved resistance to rapid crack propagation comprising a propylene homopolymer having a melt index of 0.05 to 8 g/10 min at 230° C./2.16 kg or propylene block copolymers of 90.0 to 99.9 wt % propylene and 0.1 to 10.0 wt % α-olefins of 2 or 4 to 18 carbon atoms having a melt index of 0.05 to 8 g/10 min at 230° C./2.16 kg or mixtures thereof, wherein the propylene homopolymers or propylene block copolymers are β-nucleated, wherein the β-nucleated propylene homopolymers or the homopolymer block of the β-nucleated propylene block copolymers have an IRτ≧0.97 and the propylene polymer pipes and pipe components for pipelines comprised of the β-nucleated propylene homopolymers have a rapid crack propagation with a critical temperature range of −5 to +40° C. and a critical pressure range≧3 bar when tested below the critical temperature and the propylene polymer pipes and pipe components comprised of the β-nucleated propylene block copolymers have a rapid crack propagation with a critical temperature range of −25 to 0° C. and a critical pressure range of ≧3 bar when tested below the critical temperature.