	US 12,006,425 B2
	Low filled automotive polypropylene composition containing recyclates
Susanne Kahlen, Linz (AT); Angelica Legras, Linz (AT); Hermann Braun, Linz (AT); Michael Jerabek, Linz (AT); Christophe Salles, Courbevoie (FR); and Daniela Mileva, Linz (AT)
Assigned to Borealis AG, Vienna (AT)
Appl. No. 18/020,341
Filed by Borealis AG, Vienna (AT)
PCT Filed Aug. 11, 2021, PCT No. PCT/EP2021/072352 § 371(c)(1), (2) Date Feb. 8, 2023, PCT Pub. No. WO2022/034125, PCT Pub. Date Feb. 17, 2022.
Claims priority of application No. 20190814 (EP), filed on Aug. 13, 2020.
Prior Publication US 2023/0257563 A1, Aug. 17, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 23/12 (2006.01); C08L 23/06 (2006.01); C08L 23/16 (2006.01)

CPC C08L 23/12 (2013.01) [C08L 23/06 (2013.01); C08L 23/16 (2013.01); C08L 2207/02 (2013.01); C08L 2207/20 (2013.01); C08L 2666/72 (2013.01)]

10 Claims

1. A composition suitable for automotive application

obtainable by blending at least components a) to f), or a), b), c), d), and f) under the proviso that e) is not present

a) 12 to 40 wt.-% of a first heterophasic polypropylene copolymer (HECO 1)

b) 12 to 40 wt.-% of a second heterophasic polypropylene copolymer (HECO 2)

c) 15 to 65 wt.-% of a polypropylene-polyethylene blend (A)

d) 3.0 to 20 wt. % of an inorganic filler

e) 0 to 14.25 wt.-% of a HDPE

f) 0.01 to 4.0 wt.-% of additives

wherein all percentages refer to the total composition, and wherein

the total content of polyethylene being the sum of said HDPE and the polyethylene of the polypropylene-polyethylene blend (A) ranges from 5.0 to 15.0 wt.-% with respect to the total composition, and wherein

(i) the first heterophasic polypropylene copolymer (HECO 1) comprises a matrix phase and an elastomer phase dispersed therein, the first heterophasic polypropylene copolymer (HECO 1) having

a melt flow rate MFR2 (230° C., ISO1133) of 8 to 25 g/10 min; and

an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135° C.) of 3.1 dl/g to 4.5 dl/g of the xylene cold soluble fraction (XCS) content; and

(ii) the second heterophasic polypropylene copolymer (HECO 2) comprises a matrix phase and an elastomer phase dispersed therein, the second heterophasic polypropylene copolymer (HECO 2) having

a melt flow rate MFR2 (230° C., ISO1133) of 25 to 75 g/10 min; and

an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135° C.) of the xylene cold soluble fraction (XCS) content lower than observed for HECO1;

and wherein

(iii) the polypropylene-polyethylene blend (A) comprises

A-1) polypropylene,

A-2) polyethylene,

wherein the weight ratio of polypropylene to polyethylene is from 19:1 to 7:3, with the polypropylene-polyethylene blend (A) having

a melt flow rate MFR2 (230° C., ISO1133) of 5.0 to 30 g/10 min; and

a xylene cold soluble fraction (XCS) of 2.0 to 15 wt.-% (ISO 16152, led, 25° C.); and

optionally a residual ash content of below 3.0 wt.-%,

and wherein the polypropylene-polyethylene blend (A) has one or more of the following properties

(aa) a content of limonene as determined by using solid phase microextraction (HS-SPME-GC-MS) of from 0.1 ppm to 100 ppm;

(bb) a content of fatty acid(s) as determined by using solid phase microextraction (HS-SPME-GC-MS) of 0.1 to 100 ppm;

(cc) a content of polyamide(s) as determined by FTIR of 0.05 to 1.5 wt.-%;

(dd) a content of polystyrene(s) as determined by FTIR of 0.05 to 3.0 wt.-%;

and wherein

(iv) the inorganic filler,

has a median particle size dm) before compounding of 0.3 to 3.0 micrometers;

and wherein

the HDPE has a melt flow rate (190° C., ISO1133) of 1.0 to 20 g/10 min and a density of 945 to 965 kg/m³

wherein components a) to e) amount to at least 95 wt.-% of the composition suitable for automotive application.