Polypropylene composition with excellent paint adhesion

US10745548B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Claudia Kniesel · Linz, AT
• Pavel Shutov · Linz, AT
• Susanne Kahlen · Leonding, AT
• Daniela Mileva · Linz, AT
• Floran Prades · Linz, AT

Key dates

• Filing date: Dec 14, 2017
• Grant date: Aug 18, 2020
• Expiry date: Dec 14, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2207/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a polypropylene composition (C) comprising: (i) 62 to 85 wt.-%, based on the total weight of the polypropylene composition (C), of a heterophasic propylene copolymer (HECO1) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 6.0 to 50.0 g/10 min; (ii) 10 to 30 wt.-%, based on the total weight of the polypropylene composition (C), of a heterophasic propylene copolymer (HECO2) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 0.1 to 5.5 g/10 min; (iii) 5 to 30 wt.-%, based on the total weight of the polypropylene composition (C), of an inorganic filler (F); wherein (a) the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO1) has a lower amount [in mol %] of C2 and/or C4 to C12 α-olefin derived comonomer units than the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO2); (b) the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO1) has a lower the intrinsic viscosity (IV) than the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO2); and (c) the xylene cold soluble (XCS) fract…