| 摘要 |
<p>Heterophasic polypropylene composition comprising
(A) 45 to 70 wt% of a propylene homo- or copolymer matrix with an MFR 2 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 MFR 2 (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/m 2 , preferably ‰¥ 25.0 kJ/m 2 , a minimum value for the Charpy notched impact strength according to ISO 179/1 eA at -20°C of ‰¥ 7.0 kJ/m 2 , preferably ‰¥ 10.0 kJ/m 2 and a tensile modulus according to ISO 527-3 of ‰¥1200 MPa; their preparation and use for producing injection moulded articles being free of flow marks.</p> |
