Stiff polypropylene composition with excellent elongation at break

摘要

Polypropylene composition comprising (a) a high melt strength polypropylene having a melt flow rate MFR2 (230° C.) of equal or below 15 g/10 min and a branching index g′ of below 1.0, (b) a first heterophasic propylene copolymer comprising a polypropylene having a melt flow rate MFR2 (230° C.) in the range of 50 to 500 g/10 min and an elastomeric propylene copolymer having a propylene content in the range of 50 to 80 wt.-% and an intrinsic viscosity (IV) of equal or more than 2.5 dl/g, (c) a second heterophasic propylene copolymer comprising a random propylene copolymer having a melt flow rate MFR2 (230° C.) in the range of 1 to 40 g/10 min, a branching index g′ of 1.0, and a comonomer content of more than 0.5 wt.-%, and an elastomeric propylene copolymer having a propylene content in the range of 50 to 80 wt.-%, and an intrinsic viscosity (IV) of equal or below 2.4 dl/g, (d) a polyethylene plastomer having an ethylene content of at least 50 wt.-%, and (e) a mineral filler (F).

主权项

1. Polypropylene composition comprising:
(A) a first heterophasic propylene copolymer (HECOI) comprising (i) a polypropylene (PP1) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 50 to 500 g/10 min, and (ii) an elastomeric propylene copolymer (E1) having (a) a propylene content in the range of 50 to 80 wt. %, and (b) an intrinsic viscosity (IV) measured according to ISO 1628-1 (at 135° C. in decaline) of equal or more than 2.5 dl/g, (B) a high melt strength polypropylene (HMS-PP) having (i) a branching index g′ of below 1.0, and (ii) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of equal or below 15 g/10 min, (c) a second heterophasic propylene copolymer (HECO2) comprising (i) a random propylene copolymer (R-PP2) having (a) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 1 to 40 g/10 min, a branching index g′ being higher than the branching index g′ of the high melt strength polypropylene (HMS-PP), and (c) a comonmer content of equal or more than 0.5 wt. %, the comonomers are ethylene and/or C4 to C12 α-olefins, (ii) an elastomeric propylene copolymer (E2) having (a) a propylene content in the range of 50 to 80 wt. %, and (b) an intrinsic viscosity (IV) measured according to ISO 1628-1 (at 135° C. in decaline) of equal or below 2.4 dl/g,(d) a polyethylene plastomer (PE) having (i) an ethylene content of at least 50 wt. %, and (ii) a density measured according to ISO 1183-187 in the range of 820 to 920 kg/m3, and (e) a mineral filler (F).