US 12,269,939 B2
Foamed polypropylene composition comprising polymeric fibers
Susanne Kahlen, Linz (AT); Daniela Mileva, Linz (AT); Georg Grestenberger, Linz (AT); Michael Jerabek, Linz (AT); and Thomas Lummerstorfer, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 15/734,895
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Jul. 30, 2019, PCT No. PCT/EP2019/070482
§ 371(c)(1), (2) Date Dec. 3, 2020,
PCT Pub. No. WO2020/025605, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 18186625 (EP), filed on Jul. 31, 2018.
Prior Publication US 2021/0221990 A1, Jul. 22, 2021
Int. Cl. C08L 23/12 (2006.01); C08L 23/16 (2006.01)
CPC C08L 23/12 (2013.01) [C08L 23/16 (2013.01); C08L 2203/14 (2013.01); C08L 2205/02 (2013.01); C08L 2205/16 (2013.01); C08L 2205/22 (2013.01); C08L 2205/24 (2013.01); C08L 2207/02 (2013.01)] 10 Claims
 
1. A polypropylene composition (C), comprising
a) 68.0 to 77.0 wt % of a heterophasic propylene copolymer (HECO) having a melt flow rate MFR2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 0.1 to 30 g/10 min and having a xylene soluble fraction (XCS) in the range of 28.0 to 35.0 wt %, based on the overall weight of the heterophasic propylene copolymer (HECO) comprising
i) a matrix being a propylene polymer (PP1), and
ii) an elastomeric propylene copolymer (EPR) being dispersed in said matrix, wherein the elastomeric propylene copolymer (EPR) has an ethylene content of 40.0 to 55.0 mol %,
b) 6.5 to 8.5 wt % of a crystalline propylene homopolymer (PP2) having a melt flow rate MFR2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 100 to 800 g/10 min, and
c) 15.0 to 25.0 wt % of polymeric fibers (PF), wherein the polymeric fibers (PF) are polyethylene terephthalate fibers (PET-F) having a melting temperature Tm equal or above 210° C.,
based on the overall weight of the polypropylene composition (C),
wherein said polypropylene composition (C) is a foamable polypropylene composition.