# US 11,111,369 B2 · Foamed polypropylene composition

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- Number: US 11,111,369 B2
- Document ID: US11111369B2
- Status: Granted
- Kind: B2
- Application number: 16/461,217
- Filed: 2017-11-28
- Published: 2019-09-05
- Granted: 2021-09-07
- Earliest claimed: 2016-12-01
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Susanne Kahlen; Daniela Mileva; Georg Grestenberger; Michael Tranninger; Michael Jerabek; Dieter Nicolussi; Anna Hartl
- Web page: https://patentgrep.com/patent/US11111369B2

## CPC

- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08F 210/06: Propene
- C08J 9/0061: {characterized by the use of several polymeric components}
- C08J 9/0066: {Use of inorganic compounding ingredients}
- C08L 23/12: Polypropene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08J 2323/12: Polypropene
- C08J 2323/16: Ethene-propene or ethene-propene-diene copolymers
- C08J 2423/06: Polyethene
- C08J 2423/12: Polypropene
- C08J 2423/16: Ethene-propene or ethene-propene-diene copolymers
- C08L 2203/14: used for foams
- 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 2205/035: containing four or more polymers in a blend
- C08L 2207/02: Heterophasic composition
- C08L 2207/062: HDPE
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

The present invention is directed to a polypropylene composition (C) comprising a heterophasic propylene copolymer and an inorganic filler, the use of said polypropylene composition (C) for the production of a foamed article and a foamed article obtained from said polypropylene composition (C).

## Claims

### Claim 1

A polypropylene composition (C), comprising:
a) a first heterophasic propylene copolymer (HECO1) having a comonomer content of the xylene soluble fraction (XCS) equal or above 40.0 mol %, said first heterophasic propylene copolymer comprising:
i) a first matrix being a first propylene polymer (M1) and
ii) a first elastomeric propylene copolymer (E1) being dispersed in said first matrix,
b) a second heterophasic propylene copolymer (HECO2) having a comonomer content of the xylene soluble fraction (XCS) below 39.0 mol %, wherein the xylene soluble fraction (XCS) of the second heterophasic copolymer (HECO2) has an intrinsic viscosity (IV) above 3.5 dl/g, said second heterophasic propylene copolymer comprising:
iii) a second matrix being a second propylene polymer (M2) and
iv) a second elastomeric propylene copolymer (E1) being dispersed in said second matrix,
c) an inorganic filler (F),
d) optionally a high density polyethylene (HDPE), and
e) optionally a plastomer (PL) being a copolymer of ethylene and a C4 to C8 α-olefin.

### Claim 2 (depends on 1)

The polypropylene composition (C) according to claim 1, comprising:
a) 40.0 to 60.0 wt. % of the first heterophasic propylene copolymer (HECO1),
b) 21.0 to 31.0 wt. % of the second heterophasic propylene copolymer (HECO2),
c) 10.0 to 20.0 wt. % of the inorganic filler (F),
d) optionally 2.0 to 10.0 wt. % of the high density polyethylene (HDPE), and
e) optionally 5.0 to 15.0 wt. % of the plastomer (PL) being a copolymer of ethylene and a C4 to C8 α-olefin,
based on the overall polypropylene composition (C).

### Claim 3 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein:
i) the matrix of the first heterophasic propylene copolymer (HECO1) being the first propylene polymer (M1) has a melt flow rate MFR2 (230° C.) determined according to ISO 1133 in the range of 120 to 500 g/10 min and
ii) the matrix of the second heterophasic propylene copolymer (HECO2) being the second propylene polymer (M2) has a melt flow rate MFR2 (230° C.) determined according to ISO 1133 in the range of 40 to 170 g/10 min.

### Claim 4 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the first heterophasic propylene copolymer (HECO1) has:
i) a melt flow rate MFR2 (230° C.) determined according to ISO 1133 in the range of 50 to 90 g/10 min, and/or
ii) a comonomer content in the range of 20.0 to 50.0 mol %, and/or
iii) a xylene soluble fraction (XCS) in the range of 10.0 to 35.0 wt. %.

### Claim 5 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the second heterophasic propylene copolymer (HECO2) has:
i) a melt flow rate MFR2 (230° C.) determined according to ISO 1133 in the range of 1.0 to 15 g/10 min, and/or
ii) a comonomer content in the range of 5.0 to 30.0 mol %, and/or
iii) a xylene soluble fraction (XCS) in the range of 20.0 to 40.0 wt. %.

### Claim 6 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the first propylene polymer (M1) and/or the second propylene polymer (M2) are propylene homopolymers.

### Claim 7 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the first elastomeric propylene copolymer (E1) and/or the second elastomeric propylene copolymer (E2) are copolymers of propylene and ethylene.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the plastomer (PL) is a copolymer of ethylene and 1-octene.

### Claim 10 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein the inorganic filler (F) is talc and/or wollastonite.

### Claim 11 (depends on 1)

The polypropylene composition (C) according to claim 1, wherein said polypropylene composition (C) is a foamable polypropylene composition.

### Claim 12 (depends on 1)

A foamed article, comprising the polypropylene composition (C) according to claim 1.

### Claim 13 (depends on 12)

The foamed article according to claim 12, wherein said foamed article is an automotive article.