Ethylene-based polymer compositions and foams

Patent metadata

Field	Value
Publication number	US-9527974-B2
Application number	US-201615007325-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Aug 29, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 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 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 second polymer is v) an olefin block interpolymer.

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

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

8. The composition of claim 7 , 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.

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

10. The composition of claim 9 , wherein the ethylene/α-olefin/non-conjugated diene interpolymer has a Mooney Viscosity (ML 1+4) at 125° C., from 5 to 70.

11. The composition of claim 1 , wherein A is present in an amount from 40 to 90 weight percent, and B is present in an amount from 60 to 10 weight percent, and wherein the weight percentages of A and B are each based on the sum weight of A and B.

12. The composition of claim 1 , further comprising another polymer selected from the following: propylene-ethylene copolymers, EPR, SEBS, SBS, EVA, LDPE, LLDPE, EAA, EEA, EMA, EBA, or EMAA.

13. The composition of claim 12 , wherein the other polymer is present in an amount less than 20 weight percent, based on the weight of the composition.

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

15. A foam formed from the composition of any of the previous claims.

16. 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

• C08L23/0815 Primary

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

• C08J9/103

  Azodicarbonamide · CPC title

• C08L23/08

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