Polypropylene - polyethylene blends with improved properties

Abstract

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 DEG 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 -25DEG C and an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135DEG 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 23DEG C), Flexural Modulus (according to ISO 178) as well as heat deflection resistance (determined with DMTA according to ISO 6721-7).

Description

technical field [0001] The present invention relates to blends of polypropylene and polyethylene comprising a specific class of compatibilizers. Due to the addition of specific compatibilizers, rigidity, impact strength and heat deformation resistance are simultaneously increased. Furthermore, the present invention also relates to recycled blends of polypropylene and polyethylene containing specific types of compatibilizers. Background technique [0002] Polyolefins like polypropylene and polyethylene are typical commercial polymers with many fields of application and a significant growth rate. The reason for this is not only their favorable price / performance ratio, but also the versatility of this class of materials and their very wide range of possible modifications, which allow a wide range of end-use properties to be tuned. [0003] Chemical modification, copolymerization, blending, stretching, heat treatment and combinations of these techniques can convert common grad...

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