Borealis Ag

Klaus Bernreiter

Martina Sandholzer

Petar Emilov Doshev

Torvald Vestberg

Christelle Grein

Tanja Piel

Gregory Potter

Bernt-Åke Sultan

Elisabeth Hebesberger

Mari Kylmala

Heterophasic polypropylene copolymers having an MFR (2.16 kg, 230&#xb0; C.) of 15 to 200 g/10 min, determined according to ISO 1133 comprising a propylene homo- or copolymer matrix with an MFR (2.16 kg, 230&#xb0; C.) of 80 to 500 g/10 min, determined according to ISO 1133 (A) and an ethylene or C-C-alpha-olefin propylene rubber phase (B) dispersed within the matrix, wherein the heterophasic polypropylene resin has a fraction soluble in p-xylene at 25&#xb0; C. (XCS), having an intrinsic viscosity of 2.85 to 4.00 dl/g, determined according to DIN EN ISO 1628-1 and -3 and being composed of propylene monomer units in an amount of 70 wt % to 90 wt %, with optimum balance of impact resistance and low amount of hexane extractables; a process for their preparation and their use.

Propylene polymer composition having superior hexane extractables/impact balance

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Linz, Austria

Klaus Bernreiter