Polypropylene composition with improved impact resistance for pipe applications
AssigneesAbu Dhabi Polymers Co. Ltd (Borouge) LLC., Borealis AG
InventorsCristian Hedesiu, Kauno Alastalo
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Abstract
The present invention relates to a polypropylene composition comprising a multimodal propylene random copolymer with at least one comonomer selected from alpha-olefins with 2 or 4 to 8 carbon atoms, wherein the polypropylene composition has a melt flow rate MFR2 (2.16 kg, 230° C.) of 0.05 to 1.0 g/10 min, determined according to ISO 1133, a polydispersity index (PI) of 2.0 to 7.0, and a Charpy Notched Impact Strength at 0° C. of more than 4.0 kJ/m2, determined according to ISO 179/1eA:2000 using notched injection moulded specimens, a process for producing said polypropylene composition, an article comprising said polypropylene composition and the use of said polypropylene composition for the production of an article.
Claims20
A polypropylene composition suitable for pipe applications comprising:
- a propylene random copolymer with at least one comonomer selected from alpha-olefins with 2 or 4 to 8 carbon atoms,
- wherein the propylene random copolymer comprises at least (i) a propylene random copolymer fraction having a low molecular weight, which is a low molecular weight fraction, and (ii) a propylene random copolymer fraction having a high molecular weight, which is a high molecular weight fraction, wherein the weight average molecular weight of the low molecular weight fraction is lower than that of the high molecular weight fraction,
- wherein the polypropylene composition has a melt flow rate MFR2 (2.16 kg, 230° C.) of 0.05 to 1.0 g/10 min, determined according to ISO 1133, a polydispersity index (PI) of 2.0 to 7.0, and a Charpy Notched Impact Strength at 0° C. of more than 6.5 kJ/m2, determined according to ISO 179/1eA:2000 using notched injection moulded specimens;
- and
- wherein the polypropylene composition does not comprise a polymeric nucleating agent.
Dependencies are inferred from the claim text.