Stiff polypropylene composition with excellent elongation at break

US9181423B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Cornelia Kock · Traun, AT
• Christelle Grein · Linz, AT
• Tonja Schedenig · Ansfelden, AT

Key dates

• Filing date: Aug 25, 2011
• Grant date: Nov 10, 2015
• Expiry date: Nov 23, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polypropylene composition comprising (a) a high melt strength polypropylene having a melt flow rate MFR2 (230° C.) of equal or below 15 g/10 min and a branching index g′ of below 1.0, (b) a first heterophasic propylene copolymer comprising a polypropylene having a melt flow rate MFR2 (230° C.) in the range of 50 to 500 g/10 min and an elastomeric propylene copolymer having a propylene content in the range of 50 to 80 wt.-% and an intrinsic viscosity (IV) of equal or more than 2.5 dl/g, (c) a second heterophasic propylene copolymer comprising a random propylene copolymer having a melt flow rate MFR2 (230° C.) in the range of 1 to 40 g/10 min, a branching index g′ of 1.0, and a comonomer content of more than 0.5 wt.-%, and an elastomeric propylene copolymer having a propylene content in the range of 50 to 80 wt.-%, and an intrinsic viscosity (IV) of equal or below 2.4 dl/g, (d) a polyethylene plastomer having an ethylene content of at least 50 wt.-%, and (e) a mineral filler (F).