Propylene polymer compositions
AssigneeBorealis Technology Oy
InventorsJohannes Wolfschwenger, Christelle Grein, Klaus Bernreitner, Markus Gahleitner, Thor Kamfjord
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Abstract
The invention relates to propylene polymer compositions comprising 50-70 wt % of a propylene homo- or copolymer, 5-20 wt % of a first elastomeric ethylene-propylene copolymer, 5-25 wt % of a second elastomeric ethylene-propylene copolymer and 5-30 wt % of an ethylene polymer. The propylene polymer compositions are suitable for molding and they have low haze and a good impact strength/stiffness balance with good impact strengths at low temperatures.
Claims16
A polypropylene composition for moulding having an MFR (230° C./2.16 Kg)>8 g/10 min comprising
- A) 50-70 wt % of a propylene polymer comprising a propylene homopolymer and/or a propylene copolymer with up to 5 wt % ethylene and/or one or more C4-C8 α-olefins and having an intrinsic viscosity IVA 1.00-2.20 dl/g, measured according to DIN ISO 1628 in decalin at 135° C.,
- B) 5-20 wt % of a first elastomeric ethylene-propylene copolymer having an intrinsic viscosity IVB 1.65-2.50 dl/g, measured according to DIN ISO 1628 in decal in at 135° C., and an ethylene content of 20-40 wt %, with IVB>IVA,
- C) 5-25 wt % of a second elastomeric ethylene-propylene copolymer having an intrinsic viscosity IVC of 0.90 1.60 dl/g, measured according to ISO 1628 in decalin at 135° C., and an ethylene content of 45-85 wt %, and
- D) 5-30 wt % of an ethylene polymer having an ethylene content of at least 80 mol % and having a melt index MI (190° C., 2.16 kg) of at least 5 g/10 min and a density of 905-925 kg/m3.
A polypropylene composition for molding having an MFR (230° C./2.16 kg)≧8 g/10 min comprising
- A) 50-70 wt % of a propylene polymer comprising a propylene homopolymer and/or a propylene copolymer with up to 5 wt % ethylene and/or one or more C4-C8 α-olefins and having an intrinsic viscosity IVA 1.00-2.20 dl/g, measured according to DIN ISO 1628 in decalin at 135° C.;
- B) 5-20 wt % or a first elastomeric ethylene-propylene copolymer having an intrinsic viscosity IVB 1.80-2.25 dl/g, measured according to DIN ISO 1628 in decalin at 135° C., and an ethylene content of 20-40 wt %, wherein IVB>IVA;
- (C) 5-25 wt % of a second elastomeric ethylene-propylene copolymer having an intrinsic viscosity IVC of 0.90-160 dl/g, measured according to ISO 1628 in decalin at 135° C., and an ethylene content of 45-85 wt %, wherein IVB-IVC3 0.2 dl/g;
- and
- D) 5-30 wt % aim ethylene polymer having an ethylene content of at least 80 mol % and having a inch index MI (190° C., 2.16 kg) of at least 5 g/10 min and a density of 905-925 kg/m3,
- wherein the ratio (B+C)/D of the amounts of elastomeric copolymers (B+C) to the amount of ethylene polymer D is from 0.3:1 to 2.5:1.
Dependencies are inferred from the claim text.