Foamed polypropylene composition

Patent metadata

Field	Value
Publication number	US-11111369-B2
Application number	US-201716461217-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Dec 1, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

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).

First claim

The invention claimed is:

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 C 4 to C 8 α-olefin.

2. 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 C 4 to C 8 α-olefin,
based on the overall polypropylene composition (C).

3. 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 MFR 2 (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 MFR 2 (230° C.) determined according to ISO 1133 in the range of 40 to 170 g/10 min.

4. The polypropylene composition (C) according to claim 1 , wherein the first heterophasic propylene copolymer (HECO1) has:
i) a melt flow rate MFR 2 (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. %.

5. The polypropylene composition (C) according to claim 1 , wherein the second heterophasic propylene copolymer (HECO2) has:
i) a melt flow rate MFR 2 (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. %.

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

7. 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.

8. The polypropylene composition (C) according to claim 1 , having a melt flow rate MFR 2 (230° C.) determined according to ISO 1133 in the range of 10 to 40 g/10 min.

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

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

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

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

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

Assignees

• Borealis Ag

Inventors

• Kahlen Susanne
• Mileva Daniela
• Grestenberger Georg
• Tranninger Michael
• Jerabek Michael
• Nicolussi Dieter
• Hartl Anna

Classifications

• C08L2203/14

  used for foams · CPC title

• C08L23/14 Primary

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08F210/06

  Propene · CPC title

• C08L23/06

  Polyethylene · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title