Ethylene propylene copolymer compounds for use in layered articles

Patent metadata

Field	Value
Publication number	US-11965085-B2
Application number	US-202017419039-A
Country	US
Kind code	B2
Filing date	Jan 10, 2020
Priority date	Jan 14, 2019
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A multilayer structure can include at least one layer that comprises an ethylene propylene diene copolymer compound that comprises: 60 parts per hundred rubber (phr) to 95 phr of a first ethylene propylene diene copolymer (EP(D)M) having an ethylene content of 62 wt % to 90 wt % based on the first EP(D)M and a heat of fusion (H f ) of 15 J/g or greater; 5 phr to 40 phr of an second EP(D)M having an ethylene content of 40 wt % to 60 wt % based on the second EP(D)M and a H f of 0 J/g to 14 J/g, wherein the H f of the first EP(D)M minus the H f of the second EP(D)M is 5 J/g or greater; wherein the first EP(D)M and second EP(D)M combined are 100 parts; a filler at 40 phr to 500 phr; and a curing agent at 0.5 phr to 20 phr.

First claim

The invention claimed is:

1. An article comprising:
a multilayer structure with at least one layer comprising an ethylene propylene diene copolymer compound that comprises:
60 parts per hundred rubber (phr) to 95 phr of a first ethylene propylene diene copolymer having an ethylene content of 62 wt % to 90 wt % based on the first ethylene propylene diene copolymer and a heat of fusion (H f ) of 15 J/g or greater;
5 phr to 40 phr of a second ethylene propylene diene copolymer having an ethylene content of 40 wt % to 60 wt % based on the second ethylene propylene diene copolymer and a heat of fusion (H f ) of 0 J/g;
wherein the first ethylene propylene diene copolymer and second ethylene propylene diene copolymer combined are 100 parts;

a filler at 40 phr to 500 phr; and
a curing agent at 0.5 phr to 20 phr.

2. The article of claim 1 , wherein the ethylene propylene diene copolymer compound has at least one of the following three properties:
(i) greater than 20% increase in a building tack without aging as compared to a control compound that is identical to the ethylene propylene diene copolymer compound except 0 phr of the second ethylene propylene diene copolymer and 100 phr of the first ethylene propylene diene copolymer,
(ii) greater than 50% retention in a building tack with aging at ambient condition for 1 month, and
(iii) not more than 30% decrease in a green strength as compared to the control compound.

3. The article of claim 1 , wherein the first ethylene propylene diene copolymer comprises units derived from ethylene, propylene, and a diene, wherein a diene content is 0.1 wt % to 6 wt % based on the first ethylene propylene diene copolymer.

4. The article of claim 1 , wherein the second ethylene propylene diene copolymer comprises units derived from ethylene, propylene, and a diene, wherein a diene content is 0.1 wt % to 6 wt % based on the second ethylene propylene diene copolymer.

5. The article of claim 1 , wherein the ethylene propylene diene copolymer compound is absent processing oil.

6. The article of one of claim 1 , wherein the ethylene propylene diene copolymer compound further comprises 0.1 phr to 30 phr processing oil.

7. The article of claim 1 , wherein the ethylene propylene diene copolymer compound further comprises an antioxidant at 0.1 phr to 20 phr.

8. The article of claim 1 , wherein the ethylene propylene diene copolymer compound further comprises a softener at 0.1 phr to 20 phr.

9. The article of claim 1 , wherein the article is a belt, a tube, a hose, or a roof sheeting.

10. The article of claim 1 , wherein the multilayer structure is absent an adhesive adjacent to the at least one layer comprising the ethylene propylene diene copolymer compound.

11. A method comprising:
forming an ethylene propylene diene copolymer compound comprising:
60 parts per hundred rubber (phr) to 95 phr of a first ethylene propylene diene copolymer having an ethylene content of 62 wt % to 90 wt % based on the first ethylene propylene diene copolymer and a heat of fusion (H f ) of 15 J/g or greater;
5 phr to 40 phr of a second ethylene propylene diene copolymer having an ethylene content of 40 wt % to 60 wt % based on the second ethylene propylene diene copolymer and a heat of fusion (H f ) of 0 J/g
a filler at 40 phr to 100 phr; and
a curing agent at 0.5 phr to 20 phr;

forming a multilayer structure comprising at least one layer comprising the ethylene propylene diene copolymer compound; and
vulcanizing the multilayer structure.

12. The method of claim 11 , wherein the ethylene propylene diene copolymer compound has at least one of the following three properties:
(i) greater than 20% increase in a building tack without aging as compared to a control compound that is identical to the ethylene propylene diene copolymer compound except 0 phr of the second ethylene propylene diene copolymer and 100 phr of the first ethylene propylene diene copolymer,
(ii) greater than 50% retention in a building tack with aging at ambient condition for 1 month, and
(iii) not more than 30% decrease in a green strength as compared to the control compound.

13. The method of claim 11 , wherein the first ethylene propylene diene copolymer comprises units derived from ethylene, propylene, and a diene, wherein a diene content is 0.1 wt % to 6 wt % based on the first ethylene propylene diene copolymer.

14. The method of claim 11 , wherein the second ethylene propylene diene copolymer comprises units derived from ethylene, propylene, and a diene, wherein a diene content is 0.1 wt % to 6 wt % based on the second ethylene propylene diene copolymer.

15. The method of claim 11 , wherein the ethylene propylene diene copolymer compound is absent processing oil.

16. The method of claim 11 , wherein the ethylene propylene diene copolymer compound further comprises 0.1 phr to 30 phr processing oil.

17. The method of claim 11 , wherein the ethylene propylene diene copolymer compound further comprises an antioxidant at 0.1 phr to 20 phr.

18. The method of claim 11 , wherein the ethylene propylene diene copolymer compound further comprises a softener at 0.1 phr to 20 phr.

19. The method of claim 11 , wherein the article is a V-belt.

20. The method of claim 11 , wherein the multilayer structure is absent an adhesive adjacent to the at least one layer comprising the ethylene propylene diene copolymer compound.

Assignees

• Exxonmobil Chemical Patents Inc
• Exxonmobil Engineering & Tech Company

Inventors

• Bai Zhifeng
• Loyd Scott H
• Dharmarajan Narayanaswami
• Kolb Rainer
• Abmayr Jr David W
• Irani Khodabakhsh

Classifications

• C08L23/16 Primary

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

• B32B1/08

  Tubular products · CPC title

• B32B25/042

  of natural rubber or synthetic rubber · CPC title

• B32B25/14

  comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)} · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title