# US 10,308,797 B2 · Polypropylene compositions for automotive applications

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- Number: US 10,308,797 B2
- Document ID: US10308797B2
- Status: Granted
- Kind: B2
- Application number: 15/764,828
- Filed: 2016-09-28
- Published: 2018-11-08
- Granted: 2019-06-04
- Earliest claimed: 2015-10-06
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Thomas Lummerstorfer; Georg Grestenberger; Michael Tranninger
- Web page: https://patentgrep.com/patent/US10308797B2

## CPC

- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/12: Polypropene
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2207/02: Heterophasic composition
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to novel polypropylene compositions suitable for automotive applications, having a good balance of mechanical properties and especially low gloss. The inventive compositions are characterized by at least two heterophasic propylene copolymers (HECOs), where at least one of the HECOs is characterized by a rather high molecular weight rubber, an ethylene-a-olefin elastomer (EOE) having a rather low melt flow rate MFR2 (190° C.) and a specific ratio between the MFR of the ethylene-a-olefin elastomer (EOE) and of at least one of the heterophasic propylene copolymers (HECOs).

## Claims

### Claim 1

Polypropylene composition (PPC) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of ≥9.0 g/10 min, the composition comprising:
a) at least two heterophasic propylene copolymers (HECOs), wherein the at least two heterophasic propylene copolymers (HECOs) are contained in a total amount of at least 50 wt %, based on the total weight of the composition,
b) an ethylene-α-olefin elastomer (EOE) having a melt flow rate MFR2 (190° C.) measured according to ISO 1133 of <0.5 g/10 min, and
c) wherein the ratio of the MFR2 of at least one of the at least two heterophasic propylene copolymers (HECOs) to the MFR2 of the ethylene-α-olefin elastomer (EOE) [MFR2(HECO)/MFR2(EOP)] is in the range of 2/1 to 100/1, and
d) wherein the intrinsic viscosity (IV) measured according to ISO 1628-1 (decalin) of the xylene cold soluble (XCS) fraction of at least one of the at least two heterophasic propylene copolymers (HECOs) is ≥2.5 dl/g.

### Claim 2 (depends on 1)

Polypropylene composition (PPC) according to claim 1, wherein:
a) the at least two heterophasic propylene copolymers (HECOs) are contained in a total amount of 55-85 wt. % and/or
b) the ethylene-α-olefin elastomer (EOE) is contained in an amount of 5-25 wt %, based on the total weight of the composition.

### Claim 3 (depends on 1)

Polypropylene composition (PPC) according to claim 1, wherein the polypropylene composition (PPC) comprises a first heterophasic propylene copolymer (HECO-1) and a second heterophasic propylene copolymer (HECO-2), wherein further the weight ratio between the first heterophasic propylene copolymer (HECO-1) and the second heterophasic propylene copolymer (HECO-2) [(HECO-1)/(HECO-2)] is in the range of 3/1 to 1/2.

### Claim 4 (depends on 3)

Polypropylene composition (PPC) according to claim 3, wherein:
a) the first heterophasic propylene copolymer (HECO-1) is contained in an amount of 20-75 wt. % and/or
b) the second heterophasic propylene copolymer (HECO-2) is contained in an amount of 15-50 wt %, based on the total weight of the composition.

### Claim 5 (depends on 3)

Polypropylene composition (PPC) according to claim 3, wherein the first heterophasic propylene copolymer (HECO-1) has:
a) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 50-500 g/10 min, and/or
b) a xylene cold soluble fraction (XCS) of 10.0 to 30.0 wt. %, and/or
c) a total propylene content of 75.0 to 97.0 wt. %, and/or
d) a propylene content in the xylene cold soluble (XCS) fraction of 55.0 to 75.0 wt. % and/or
e) an intrinsic viscosity (IV) measured according to ISO 1268-1 (decalin) of the xylene cold soluble (XCS) fraction of 1.5-4.0 dl/g.

### Claim 6 (depends on 3)

Polypropylene composition (PPC) according to claim 3, wherein the second heterophasic propylene copolymer (HECO-2) has:
a) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 0.5-20 g/10 min, and/or
b) a xylene cold soluble fraction (XCS) of 10.0 to 30.0 wt. %, and/or
c) a total propylene content of 70.0 to 95.0 wt. %, and/or
d) a propylene content in the xylene cold soluble (XCS) fraction of 50.0 to 70.0 wt. % and/or
e) an intrinsic viscosity (IV) measured according to ISO 1268-1 (decalin) of the xylene cold soluble (XCS) fraction of 3.0-5.0 dl/g.

### Claim 7 (depends on 1)

Polypropylene composition (PPC) according to claim 1, wherein the ethylene-α-olefin elastomer (EOE):
a) has a density measured according to ISO 1183-1 of 870 kg/m3, preferably of 850-870 kg/m3 and/or
b) the α-olefin comonomer of the ethylene-α-olefin elastomer (EOE) is a C4-C10 α-olefin.

### Claim 8 (depends on 1)

Polypropylene composition (PPC) according to claim 1, wherein the polypropylene composition (PPC) comprises:
a reinforcing mineral filler (F) in an amount of up to 10 wt %.

### Claim 9 (depends on 8)

Polypropylene composition (PPC) according to claim 8, wherein the mineral filler (F):
a) is selected from a phyllosilicate, mica or wollastonite; and/or
b) has an average particle size d50 of 0.8 to 25.0 μm, more preferably of 2.5 to 15.0 μm.

### Claim 10 (depends on 1)

Polypropylene composition (PPC) according to claim 1, wherein:
a) the polypropylene composition (PPC) does not contain high density polyethylene (HDPE) and/or
b) the polypropylene composition (PPC) does not contain inorganic antiblocking agent.

### Claim 11 (depends on 1)

Automotive article comprising a polypropylene composition (PPC) according to claim 1.