Polypropylene composition with outstanding impact performance

Patent metadata

Field	Value
Publication number	US-11186708-B2
Application number	US-201816620825-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 29, 2017
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

The present invention is directed to a polypropylene composition (C) comprising a polypropylene matrix, a dispersed phase comprising two different elastomeric ethylene copolymers and an inorganic filler. The present invention is further directed to an article comprising said polypropylene composition (C).

First claim

The invention claimed is:

1. A polypropylene composition (C) having a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 15.0 to 40.0 g/10 min, comprising:
i) 45.0 to 80.0 wt. % of a matrix (M) comprising a propylene polymer (PP1),
ii) 15.0 to 40.0 wt. % of an elastomeric fraction (E) dispersed within said matrix (M), comprising
a) a first elastomeric ethylene copolymer (E1) having an ethylene content of at least 30.0 mol %, and
b) a second elastomeric ethylene copolymer (E2) having an ethylene content equal or below 30.0 mol %, and
iii) an inorganic filler (F).

2. The polypropylene composition (C) according to claim 1 , wherein the elastomeric fraction (E) comprises the first elastomeric ethylene copolymer (E1) and the second elastomeric ethylene copolymer (E2) in a weight ratio of 2:1 to 10:1.

3. The polypropylene composition (C) according to claim 1 , comprising:
i) 45.0 to 65.0 wt. % of the propylene polymer (PP1),
ii) 10.0 to 32.0 wt. % of the first elastomeric ethylene copolymer (E1),
iii) 0.5 to 10.0 wt. % of the second elastomeric ethylene copolymer (E2), and
iv) 15.0 to 30.0 wt. % of the inorganic filler,
based on the overall amount of the polypropylene composition (C).

4. The polypropylene composition (C) according to claim 1 , wherein the propylene polymer (PP1):
i) is a propylene homopolymer (H-PP1) and/or
ii) has a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 20.0 to 200.0 g/10 min.

5. The polypropylene composition (C) according to claim 1 , wherein the first elastomeric ethylene copolymer (E1) is a copolymer of ethylene and a C4 to C20 α-olefin.

6. The polypropylene composition (C) according to claim 5 , wherein the first elastomeric ethylene copolymer (E1) has:
a) a melt flow rate MFR (190° C., 2.16 kg) measured according to ISO 1133 below 100.0 g/10 min,
b) a C4 to C20 α-olefin content, based on the total weight of the first elastomeric ethylene copolymer (E1), in the range of 5.5 to 30.0 mol %, and/or
c) a density below 0.885 g/cm 3 .

7. The polypropylene composition (C) according to claim 5 , wherein the first elastomeric ethylene copolymer (E1) is a copolymer of ethylene and 1-butene or 1-octene.

8. The polypropylene composition (C) according to claim 1 , wherein the second ethylene copolymer (E2) is a copolymer of propylene and ethylene.

9. The polypropylene composition (C) according to claim 8 , wherein the second ethylene copolymer (E2) has:
a) a propylene content of at least 60.0 mol %,
b) a density below 0.870 g/cm 3 , and/or
c) a melt flow rate MFR (190° C., 2.16 kg) measured according to ISO 1133 in the range of 0.5 to 15.0 g/10 min.

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

11. The polypropylene composition (C) according to claim 1 , wherein the first elastomeric ethylene copolymer (E1) and the second ethylene copolymer (E2) do not contain monomer units derivable from styrene or derivatives thereof.

12. An article comprising the polypropylene composition (C) according to claim 1 .

13. The article according to claim 12 , wherein the article is a moulded article.

14. The article according to claim 12 , comprising at least 60 wt. % of the polypropylene composition (C).

Assignees

• Borealis Ag

Inventors

• Lummerstorfer Thomas
• Kniesel Claudia
• Grestenberger Georg

Classifications

• 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

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title