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AssigneeBorealis Technology Oy
InventorsJames MCGOLDRICK, Franz RUEMER, Stefan SCHIESSER, Siegfried LIEDAUER
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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 % α-olefins with 2 or 4 to 18 carbon atoms, or mixtures thereof, wherein the propylene homopolymers or propylene block copolymers are β-nucleated propylene polymers, whereby the β-nucleated propylene homopolymers have an IRτ≧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 β-nucleated propylene block copolymers are polymers having an IRτ 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. 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.
Propylene polymers comprising propylene homopolymers having melt indices of 0.05 to 15 g/10 min at 230° C./2.6 kg or propylene block copolymers of 90.0 to 99.9 wt % propylene and 0.1 to 10 wt % α-olefins of 2 or 4 to 18 carbon atoms having melt indices of 0.05 to 20 g/10 min at 230° C./2.16 kg, or mixtures thereof, wherein the propylene homopolymers or propylene block copolymers are β-nucleated, the β-nucleated propylene homopolymers having an IRτ≧0.98, a tensile modulus of ≧1500 MPa at +23° C. and a Charpy impact strength of kJ/m2 at −20° C. using notched test specimens, and the β-nucleated propylene block copolymers are polymers having an IRτ of the propylene homopolymer block of ≧0.98, a tensile modulus of ≧1100 MPa at +23° C. and a Charpy impact strength of ≧6 kJ/m2 at −20° C. using notched test specimens.
Molded articles comprising propylene block copolymers of 90.0 to 99.9 wt % propylene and 0.1 to 10 wt % α-olefins of 2 or 4 to 18 carbon atoms having melt indices of 0.05 to 20 g/10 min at 230° C./2.16 kg which propylene block copolymers are β-nucleated, where the β-nucleated propylene block copolymers have an IRτ of the propylene homopolymer block of ≧0.98, the molded articles having a tensile modulus of ≧1100 MPa at +23° C. and a Charpy impact strength of ≧kJ/m2 at −20° C. using notched test specimens.
Dependencies are inferred from the claim text.