Polypropylene composition

Patent metadata

Field	Value
Publication number	US-11091618-B2
Application number	US-201816641694-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Sep 1, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The invention relates to a composition comprising: (A) a propylene-based polymer which is a propylene homopolymer or a propylene copolymer consisting of at least 90 wt % of propylene monomer units and at most 10 wt % of ethylene monomer units and/or an α-olefin monomer units having 4 to 10 carbon atoms and (B) a copolymer of ethylene and α-olefin comonomer having 4 to 10 carbon atoms, wherein the elastomer has a density of 0.850 to 0.910 g/cm 3 and a melt flow rate of 15 to 50 dg/min measured in accordance with IS01 133 using a 2.16 kg weight and at a temperature of 190° C., wherein the amount of (A) the propylene-based polymer is 60 to 99 wt % and the amount of (B) the copolymer is 1 to 40 wt %, with respect to the total composition.

First claim

The invention claimed is:

1. A composition comprising:
(A) a propylene-based polymer which is a random propylene-ethylene copolymer consisting of 90 to 99 wt % of propylene monomer units and 1 to 10 wt % of ethylene monomer units, and
(B) an elastomer of ethylene and α-olefin comonomer having 4 to 10 carbon atoms, wherein the elastomer has a density of 0.850 to 0.910 g/cm 3 and a melt flow rate of 15 to 50 dg/min measured in accordance with ISO1133 using a 2.16 kg weight and at a temperature of 190° C.,
wherein the amount of (A) the propylene-based polymer is 60 to 99 wt % and the amount of (B) the elastomer is 1 to 40 wt %, with respect to the total composition,
wherein the propylene-based polymer (A) has a melt flow rate of at least 20 dg/min as measured according to ISO1133 (2.16 kg, 230° C.), and
wherein the composition comprises at most 5 wt % of a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer with respect to the total composition.

2. The composition according to claim 1 , wherein the melt flow rate of the copolymer (B) is 20 to 50 dg/min.

3. The composition according to claim 2 , wherein the density of the copolymer (B) is 0.865 to 0.910 g/cm 3 .

4. The composition according to claim 3 , wherein the density of the copolymer (B) is 0.865 to 0.875 g/cm 3 .

5. The composition according to claim 3 , wherein the density of the copolymer (B) is 0.875 to 0.910 g/cm 3 .

6. The composition according to claim 1 , wherein the melt flow rate of the copolymer (B) is 15 to 20 dg/min, and optionally wherein the density of the copolymer (B) is 0.865 to 0.910 g/cm 3 .

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

8. The composition according to claim 1 , wherein the amount of the propylene-based polymer (A) is 80 to 99 wt % and the amount of the copolymer (B) is 1 to 20 wt %, with respect to the total composition.

9. The composition according to claim 1 , wherein the propylene-based polymer has a melt flow rate of 2010 to 100 dg/min, measured in accordance with ISO1133 using a 2.16 kg weight and at a temperature of 230° C.

10. The composition according to claim 1 , wherein the propylene-based polymer (A) is a random propylene-ethylene copolymer consisting of 96 to 99 wt % of propylene monomer units and 1 to 4 wt % of ethylene monomer units.

11. The composition according to claim 1 , wherein the propylene-based polymer (A) is not a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer.

12. A process for the preparation of the composition according to claim 1 , comprising melt-mixing the propylene-based polymer (A) and the copolymer (B), optionally preceded by dry-blending of (A) and (B).

13. An article comprising the composition according to claim 1 .

14. The article according to claim 13 , wherein the article is a storage container.

15. The composition according to claim 1 ,
wherein the amount of the propylene-based polymer (A) is 80 to 99 wt % and the amount of the copolymer (B) is 1 to 20 wt %, with respect to the total composition;
wherein the propylene-based polymer (A) is a random propylene-ethylene copolymer consisting of 96 to 99 wt % of propylene monomer units and 1 to 4 wt % of ethylene monomer units.

16. The composition of claim 1 , wherein
(A) the random propylene-ethylene copolymer consists of 96 to 99 wt % of propylene monomer units and 1 to 4 wt % of ethylene monomer units, and does not include a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer, and
(B) the elastomer of ethylene and α-olefin comonomer has 4 to 10 carbon atoms, wherein the elastomer has a density of 0.865 to 0.875 g/cm 3 and a melt flow rate of 15 to 20 dg/min measured in accordance with ISO1133 using a 2.16 kg weight and at a temperature of 190° C.

17. The composition according to claim 1 , wherein the composition comprises at most 3 wt % of a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer with respect to the total composition.

18. The composition according to claim 1 , wherein the composition comprises 0 wt % of a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer with respect to the total composition.

19. A composition comprising:
(A) a propylene-based polymer which is a random propylene copolymer consisting of 96 to 99 wt % of propylene monomer units and 1 to 4 wt % of ethylene monomer units and/or an α-olefin monomer units having 4 to 10 carbon atoms, and
(B) an elastomer of ethylene and α-olefin comonomer having 4 to 10 carbon atoms, wherein the elastomer has a density of 0.865 to 0.875 g/cm 3 and a melt flow rate of 15 to 20 dg/min measured in accordance with ISO1133 using a 2.16 kg weight and at a temperature of 190° C.,
wherein the amount of (A) the propylene-based polymer is 60 to 99 wt % and the amount of (B) the elastomer is 1 to 40 wt %, with respect to the total composition,
wherein the propylene-based polymer (A) has a melt flow rate of at least 20 dg/min as measured according to ISO1133 (2.16 kg, 230° C.), and
wherein the composition comprises at most 5 wt % of a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer with respect to the total composition.

Assignees

• Sabic Global Technologies Bv

Inventors

• Huang Ting
• Fu Yang
• Li Wesley
• Soliman Maria
• Yang Yang

Classifications

• C08L23/12 Primary

  Polypropene · CPC title

• C08J2423/08

  Copolymers of ethene (C08J2423/16 takes precedence) · CPC title

• C08J3/005

  Processes for mixing polymers · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title