Composition comprising heterophasic propylene copolymer

Patent metadata

Field	Value
Publication number	US-10995206-B2
Application number	US-201615751513-A
Country	US
Kind code	B2
Filing date	Jul 14, 2016
Priority date	Aug 10, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The invention relates to a composition comprising (A) a heterophasic propylene copolymer and (B) an elastomer of ethylene and α-olefin comonomer having 4 to 8 carbon atoms, wherein the heterophasic propylene copolymer consists of (a) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene copolymer consisting of at least 70 wt % of propylene and at most 30 wt % of ethylene or an α-olefin having 4-10 carbon atoms, based on the total weight of the propylene-based matrix and wherein the propylene-based matrix is present in an amount of 60 to 95 wt % based on the total heterophasic propylene copolymer and wherein the propylene-based matrix has a melt flow index of at least 0.1 dg/min and at most 45 dg/min, measured according to ISO1133 (2.16 kg/230° C.) and (b) a dispersed ethylene-α-olefin copolymer, wherein the dispersed ethylene-α-olefin copolymer is an ethylene-propylene copolymer, wherein the ethylene-α olefin copolymer is present in an amount of 40 to 5 wt % based on the total heterophasic propylene copolymer and wherein the sum of the total amount of propylene-based matrix and total amount of dispersed ethylene-α-olefin copolymer is 100 wt %, wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer is from 10 up to and including 45 wt % (RCC2) (B) an elastomer of ethylene and α-olefin comonomer having 4 to 8 carbon atoms wherein the elastomer has a density in the range from 0.88 up to and including 0.907 g/cm3.

First claim

The invention claimed is:

1. A composition comprising:
(A) a heterophasic propylene copolymer, wherein the heterophasic propylene copolymer (A) consists of
(a) a propylene-based matrix,
wherein the propylene-based matrix consists of a propylene homopolymer and
wherein the propylene-based matrix is present in an amount of 60 to 95 wt % based on the total heterophasic propylene copolymer (A) and wherein the propylene-based matrix has a melt flow index of at least 0.1 dg/min and at most 45 dg/min, measured according to ISO1133 (2.16 kg/230° C.) and

(b) a dispersed ethylene-α-olefin copolymer,
wherein the dispersed ethylene-α-olefin copolymer is an ethylene-propylene copolymer, wherein the ethylene-α olefin copolymer is present in an amount of 40 to 5 wt % based on the total heterophasic propylene copolymer (A) and
wherein the sum of the total amount of propylene-based matrix and total amount of dispersed ethylene-α-olefin copolymer is 100 wt %
wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer (A) is from 10 up to and including 45 wt % (RCC2);

(B) an elastomer of ethylene and α-olefin comonomer having 4 to 8 carbon atoms, wherein the elastomer (B) has a density in the range from 0.88 up to and including 0.907 g/cm 3 and a melt flow rate of at least 20 dg/min measured in accordance with ISO 1133 using a 2.16 kg weight and at a temperature of 190° C.,
wherein the amount of ethylene in the elastomer (B) is at least 50 mol %; and
(C) 0.02 to 0.5 wt % of a peroxide based on the heterophasic propylene copolymer (A).

2. The composition according to claim 1 , wherein the amount of elastomer (B) is in the range of 1 to 10 wt % based on the total of the amount of heterophasic propylene copolymer (A) and the amount of elastomer (B).

3. The composition of claim 2 , wherein the amount of elastomer (B) is in the range of 5 to 7 wt %, based on the total of the amount of heterophasic propylene copolymer (A) and the amount of elastomer (B).

4. The composition according to claim 1 , wherein the composition further comprises a clarifying agent in an amount of 1000 to 5000 ppm based on the total composition and/or wherein the composition comprises no or little amount of an inorganic filler.

5. The composition according to claim 1 , wherein the amount of ethylene in the elastomer (B) is at least 65 mol %.

6. The composition according to claim 5 , wherein the amount of ethylene in the elastomer (B) is at least 70 mol %.

7. The composition according to claim 1 , wherein the elastomer (B) is selected from the group consisting of ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer and mixtures thereof.

8. The composition according to claim 1 , wherein the elastomer (B) is an ethylene-1-octene copolymer.

9. A process for the preparation of the composition according to claim 1 , comprising melt mixing of the heterophasic propylene copolymer (A) and the elastomer (B).

10. An article comprising the composition of claim 1 .

11. The article according to claim 10 , wherein the article is a consumer appliance.

12. The composition of claim 1 , wherein the density of the elastomer (B) is in the range from 0.90 up to and including 0.906 g/cm 3 and wherein the amount of ethylene in the elastomer (B) is at least 70 mol %.

13. The composition according to claim 1 , wherein
the amount of ethylene in the elastomer (B) is at least 75 mol %.

14. The composition of claim 1 , wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer (A) is from 10 up to and including 25 wt % (RCC2).

15. The composition of claim 1 , wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer (A) is from 10 up to and including 22 wt % (RCC2).

16. The composition according to claim 1 , wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer (A) is from 10 up to and including 30 wt % (RCC2).

17. The composition of claim 1 , wherein the total of components (A) and (B) is at least 90 wt % of the total composition.

18. The composition according to claim 1 , A composition comprising:
(A) a heterophasic propylene copolymer, wherein the heterophasic propylene copolymer (A) consists of
(a) a propylene-based matrix,
wherein the propylene-based matrix consists of a propylene homopolymer and
wherein the propylene-based matrix is present in an amount of 60 to 95 wt % based on the total heterophasic propylene copolymer (A) and
wherein the propylene-based matrix has a melt flow index of at least 0.1 dg/min and at most 45 dg/min, measured according to ISO1133 (2.16 kg/230° C.) and
(b) a dispersed ethylene-α-olefin copolymer,
wherein the dispersed ethylene-α-olefin copolymer is an ethylene-propylene copolymer, wherein the ethylene-α olefin copolymer is present in an amount of 40 to 5 wt % based on the total heterophasic propylene copolymer (A) and
wherein the sum of the total amount of propylene-based matrix and total amount of dispersed ethylene-α-olefin copolymer is 100 wt %
wherein the amount of ethylene in the ethylene-α-olefin copolymer of the heterophasic propylene copolymer (A) is from 10 up to and including 30 wt % (RCC2); and
(B) an elastomer of ethylene and α-olefin comonomer having 4 to 8 carbon atoms, wherein the elastomer (B) has a density in the range from 0.88 up to and including 0.907 g/cm 3 ,
wherein the amount of ethylene in the elastomer (B) is at least 50 mol %; and
wherein the composition has
a tensile modulus in a range of 976.9 MPa to 1076.1 MPa, measured in accordance with ISO 527/1A with samples in the parallel orientation of injection moulding, and
an Izod notched impact (0° C., parallel) in a range of 2.8 KJ/m 2 to 5.2 KJ/m 2 , measured in accordance with ISO 180/4A.

Assignees

• Sabic Global Technologies Bv

Inventors

• Herklots Marc
• Fu Yang
• Huang Ting

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L23/0815

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

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L23/12

  Polypropene · CPC title

• C08L2207/02

  Heterophasic composition · CPC title