Heterophasic copolymers
AssigneeBorealis Technology Oy
InventorsBo Malm, Pirjo Jääskeläinen, Torvald Vestberg
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Abstract
Polypropylene heterophasic copolymers with good flow and impact properties are made by visbreaking a starting polypropylene heterophasic copolymer of which the amorphous rubber has an intrinsic viscosity of 2 dl/g or more and the ethylene content in the amorphous rubber, determined as C2 of AM, is from 20 wt-% to 45 wt-%.
Claims9
A method of preparing a polypropylene heterophasic copolymer with good flow and impact properties, which involves visbreaking a starting polypropylene heterophasic copolymer of which the amorphous rubber, measured as xylene solubles fraction (XS) at room temperature, has an ethylene content, determined as the ethylene content of the acetone precipitated amorphous rubber fraction of the xylene soluble fraction, C2 of AM, from 20 wt-% to 45 wt-%, and an intrinsic viscosity, determined as the intrinsic viscosity of the acetone precipitated amorphous rubber fraction of the xylene soluble fraction, IV of AM, of 2 dl/g or more.
Dependencies are inferred from the claim text.