	US 11,945,926 B2
	Foamed polypropylene composition
Susanne Kahlen, Linz (AT); Daniela Mileva, Linz (AT); Georg Grestenberger, Linz (AT); Andreas Fuchs, Linz (AT); Stefanie Engleder, Linz (AT); Jürgen Huber, Linz (AT); and Shengquan Zhu, Shanghai (CN)
Assigned to Abu Dhabi Polymers Co. Ltd (Borouge) LLC., Abu Dhabi (AE); and Borealis AG, Vienna (AT)
Appl. No. 17/050,550
Filed by BOREALIS AG, Vienna (AT); and ABU DHABI POLYMERS CO. LTD (BOROUGE) LLC., Abu Dhabi (AE)
PCT Filed May 14, 2019, PCT No. PCT/EP2019/062337 § 371(c)(1), (2) Date Oct. 26, 2020, PCT Pub. No. WO2019/219678, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 201810468419.8 (CN), filed on May 16, 2018.
Prior Publication US 2021/0238376 A1, Aug. 5, 2021
Int. Cl. C08J 9/00 (2006.01); C08J 9/08 (2006.01); C08K 3/34 (2006.01); C08L 23/06 (2006.01); C08L 23/08 (2006.01); C08L 23/12 (2006.01); C08L 23/16 (2006.01)

CPC C08J 9/0061 (2013.01) [C08J 9/08 (2013.01); C08K 3/34 (2013.01); C08L 23/06 (2013.01); C08L 23/0815 (2013.01); C08L 23/12 (2013.01); C08L 23/16 (2013.01); C08J 2203/02 (2013.01); C08J 2323/12 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01); C08L 2205/22 (2013.01); C08L 2207/02 (2013.01); C08L 2207/062 (2013.01)]

13 Claims

1. A polypropylene composition (C) having a melt flow rate MFR₂(230° C.) determined according to ISO 1133 in the range of 15 to 40 g/10 min, comprising

a) 35.0 to 55.0 wt.-%, based on the overall polypropylene composition (C), of a first heterophasic propylene copolymer (HECO1) having a melt flow rate MFR₂(230° C.) determined according to ISO 1133 in the range of 60 to 160 g/10 min, said first heterophasic propylene copolymer comprising

i) a first matrix being a first propylene polymer (M1) and

ii) a first elastomeric propylene copolymer (E1) dispersed in said first matrix,

b) ≥20.0 wt.-%, based on the overall polypropylene composition (C), of a second heterophasic propylene copolymer (HECO2) having a melt flow rate MFR₂(230° C.) determined according to ISO 1133 in the range of 3 to <50 g/10 min, said second heterophasic propylene copolymer comprising

iii) a second matrix, which is a second propylene polymer (M2) and

iv) a second elastomeric propylene copolymer (E2) dispersed in said second matrix,

c) 2.0 to 10.0 wt.-%, based on the overall polypropylene composition (C), of a high density polyethylene (HDPE) having a melt flow rate MFR₂(190° C.) determined according to ISO 1133 in the range of 2 to 15 g/10 min,

d) 5.0 to 15.0 wt.-%, based on the overall polypropylene composition (C), of a plastomer (PL), which is a copolymer of ethylene and a C₄to C₈α-olefin and having a melt flow rate MFR₂(190° C.) determined according to ISO 1133 in the range of 10 to 70 g/10 min,

e) 1.0 to 20.0 wt.-%, based on the overall polypropylene composition (C), of an inorganic filler (F),

f) 1.0 to 10.0 wt.-%, based on the overall polypropylene composition (C), of a foaming agent (FA) comprising citric acid in combination with a bicarbonate, and

g) optionally, a nucleating agent.