Heterophasic polypropylene copolymer composition

US8569412B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Werner Posch · Oberhaching, DE
• Michael Tranninger · Traun, AT
• Pauli Leskinen · Porvoo, FI
• Bo Malm · Espoo, FI
• Sybille Simon · Linz, AT
• Norbert Reichelt · Ansfelden, AT

Key dates

• Filing date: Jun 15, 2010
• Grant date: Oct 29, 2013
• Expiry date: Jun 15, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2314/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Heterophasic polypropylene composition comprising (A) 45 to 70 wt % of a propylene homo- or copolymer matrix with an MFR2 in accordance with ISO 1133 (230° C., 2.16 kg load) of ≧80 g/10 min and (B) 25 to 40 wt % of an elastomeric propylene-ethylene copolymer, having an intrinsic viscosity IV (ISO 1628, with decalin as solvent) of ≧3.3 dl/g and an ethylene content of 20 to 50 wt %, (C) 0-15 wt % of an elastomeric ethylene/alpha-olefin random copolymer (D) 3-25 parts per weight of inorganic filler, the heterophasic polypropylene compositions having a total MFR2 (230° C./2.16 kg) in accordance with ISO 1133 of ≧5 g/10 min, a Charpy notched impact strength according to ISO 179/1eA at +23° C. of ≧15.0 kJ/m2, preferably ≧25.0 kJ/m2, a minimum value for the Charpy notched impact strength according to ISO 179/1eA at −200 C of ≧7.0 kJ/m2, preferably ≧10.0 kJ/m2 and a tensile modulus according to ISO 527-3 of ≧1200 MPa; their preparation and use for producing injection molded articles being free of flow marks.