Ethylene-based polymer compositions and foams

Patent metadata

Field	Value
Publication number	US-9249271-B2
Application number	US-201314419541-A
Country	US
Kind code	B2
Filing date	Mar 4, 2013
Priority date	Aug 29, 2012
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

The invention provides a composition comprising the following: A) a first polymer selected from the following: i) an ethylene/α-olefin interpolymer; or ii) an ethylene/α-olefin multi-block interpolymer; B) a second polymer selected from the following: iii) an ethylene/α-olefin interpolymer; iv) an ethylene/α-olefin/non-conjugated diene interpolymer; or v) an ethylene/α-olefin multi-block interpolymer; and wherein the first polymer has a density from 0.880 to 0.910 g/cc, and the second polymer has a density less than, or equal to, 0.867 g/cc, and wherein the weight ratio of the first polymer to the second polymer is from 0.5 to 9.

First claim

The invention claimed is:

1. A composition comprising the following:
A) a first polymer selected from the following:
i) an ethylene/α-olefin interpolymer; or
ii) an ethylene/α-olefin multi-block interpolymer;

B) a second polymer selected from the following:
iii) an ethylene/α-olefin interpolymer;
iv) an ethylene/α-olefin/non-conjugated diene interpolymer; or
v) an ethylene/α-olefin multi-block interpolymer; and

wherein the first polymer has a density from 0.880 to 0.910 g/cc, and
the second polymer has a density less than, or equal to, 0.867 g/cc, and
wherein the weight ratio of the first polymer to the second polymer is from 0.5 to 9.

2. The composition of claim 1 , wherein the first polymer has a melting temperature (Tm) greater than 70° C., as determined by DSC.

3. The composition of claim 1 , wherein the first polymer has a melting temperature (Tm) less than 130° C., as determined by DSC.

4. The composition of claim 1 , wherein the first polymer has a molecular weight distribution (Mw/Mn) from 1.2 to 3.

5. The composition of claim 1 , wherein the first polymer is i) an ethylene/α-olefin interpolymer.

6. The composition of claim 5 , wherein the first polymer is a homogeneously branched linear ethylene/α-olefin interpolymer, or a homogeneously branched substantially linear ethylene/α-olefin interpolymer.

7. The composition of claim 1 , wherein the first polymer is ii) an olefin block interpolymer.

8. The composition of claim 1 , wherein the second polymer has a molecular weight distribution (Mw/Mn) from 1.2 to 3.

9. The composition of claim 1 , wherein the second polymer is iii) an ethylene/α-olefin interpolymer.

10. The composition of claim 9 , wherein the ethylene/α-olefin interpolymer is a homogeneously branched linear ethylene/α-olefin interpolymer, or a homogeneously branched substantially linear ethylene/α-olefin interpolymer.

11. The composition of claim 1 , wherein the second polymer is iv) an ethylene/α-olefin/non-conjugated diene interpolymer.

12. The composition of claim 11 , wherein the ethylene/α-olefin/non-conjugated diene interpolymer has a Mooney Viscosity (ML 1+4) at 125° C., from 5 to 70.

13. The composition of claim 1 , wherein the composition further comprises a free radical agent and a foaming agent.

14. A foam formed from the composition of claim 1 .

15. An article comprising at least one component formed from the composition of claim 1 .

Assignees

• Dow Global Technologies Llc

Inventors

• Low Bee Tin

Classifications

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · 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

• C08L2203/14

  used for foams · CPC title

• C08J2453/00

  Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers · CPC title

• C08J9/0061 Primary

  characterized by the use of several polymeric components · CPC title