POLYPROPYLENE - POLYETHYLENE BLENDS WITH IMPROVED PROPERTIES

摘要

Polypropylene-Polyethylene blends comprising A) 75 to 90wt% of a blend of A-l) polypropylene and A-2) polyethylene and B) 10 to 25wt% of a compatibilizer being a heterophasic polyolefin composition comprising B-l) a polypropylene with an MFR2 between 1.0 and 300 g/10 min (according to ISO 1133 at 230°C at a load of 2.16 kg) and B-2) a copolymer of ethylene and propylene or C4 to C10 alpha olefin with a Tg (measured with dynamic-mechanical thermal analysis, DMTA, according to ISO 6721-7) of below -25°C and an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of at least 3.0 dl/g, whereby the blend has simultaneously increased Charpy Notched Impact Strength (according to ISO 179-leA, measured at 23°C), Flexural Modulus (according to ISO 178) as well as heat deflection resistance (determined with DMTA according to ISO 6721-7).