Ethylene-based copolymer and propylene-alpha-olefin-diene compositions for use in layered articles

Patent metadata

Field	Value
Publication number	US-12448505-B2
Application number	US-202017624884-A
Country	US
Kind code	B2
Filing date	Jul 17, 2020
Priority date	Jul 17, 2019
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

An elastomeric composition is provided that includes from 1 to 100 parts by weight per hundred parts by weight rubber (phr) of a first propylene-α-olefin-diene (PEDM) terpolymer comprising 70 wt % to 92.5 wt % propylene, 7.5 wt % to 30 wt % a C2 or C4-C12 α-olefin, and 3.5 wt % to 20 wt % diene, said wt % based on the weight of the PEDM terpolymer. The PEDM terpolymer V may have a Mooney viscosity (ML(1+4)) of 25 MU to 100 MU. The composition may further include from 0 to 99 phr of an ethylene-based copolymer comprising 40 wt % to 95 wt % ethylene.

First claim

What is claimed is:

1. An elastomeric composition comprising:
from 1 to 99 parts by weight per hundred parts by weight rubber (phr) of a first propylene-α-olefin-diene (PEDM) terpolymer comprising 70 wt % to 92.5 wt % propylene, 7.5 wt % to 30 wt % a C2 or C4-C12 α-olefin, and 3.5 wt % to 20 wt % diene, said wt % based on the weight of the PEDM terpolymer, wherein the wt % numbers are uncorrected numbers wherein wt % propylene plus wt % C2 or C4-C12 α-olefin equals 100% and wherein the PEDM terpolymer has a Mooney viscosity (ML(1+4)) of 25 MU to 100 MU; and
from 1 to 99 phr of an ethylene-based copolymer comprising 40 wt % to 95 wt % ethylene, 0.5 wt % to 10 wt % of one or more dienes, and 5 wt % to 60 wt % C3 to C12 α-olefin, said wt % based on the total weight of the ethylene-based copolymer, wherein the sum of the phr of the PEDM and the phr of the ethylene-based copolymer equals 100 phr.

2. The elastomeric composition of claim 1 , further comprising from 1 to 90 phr of a second PEDM terpolymer comprising 1 wt % to 7 wt % of C2 or C4-12 α-olefin, 93 wt % to 99 wt % propylene, and 0.5 wt % to 7.5 wt % diene, and a Mooney viscosity (ML(1+4)) of 10 to 50 MU.

3. The elastomeric composition of claim 1 , wherein the first PEDM terpolymer comprises 10 wt % to 30 wt % α-olefin, and 4 wt % to 10 wt % diene.

4. The elastomeric composition of claim 1 , wherein the first PEDM terpolymer has a Mooney viscosity of 30 to 100 MU or 61 to 100 MU.

5. The elastomeric composition of claim 1 , further comprising 5 to 200 phr oil.

6. The elastomeric composition of claim 1 , wherein the PEDM terpolymer has a polymer Tg (° C.) greater than or equal to −7.386−(87.98*E)+(294*D) and less than or equal to −1.386−(87.98*E)+(294*D) wherein E is the mole fraction of ethylene in the polymer and D is the mole fraction of diene in the polymer.

7. The elastomeric composition of claim 1 , wherein the PEDM terpolymer has a heat of fusion (Hf) of less than 1 J/g.

8. The elastomeric composition of claim 1 , wherein the PEDM polymer has a number average molecular weight of 30,000 g/mol to 300,000 g/mol.

9. The elastomeric composition of claim 1 , wherein the PEDM polymer has a weight average molecular weight of 60,000 g/mol to 600,000 g/mol.

10. The elastomeric composition of claim 1 , wherein the PEDM polymer has a polydispersity index of 1.8 to 3.5.

11. The elastomeric composition of claim 1 , wherein the composition has a rubber-to-rubber tack force of 20 g of force/inch width to 6000 g of force/inch width.

12. The elastomeric composition of claim 1 , wherein the composition has a rubber-to-rubber tack force after aging at room temperature for 1 month of 20 g of force/inch width or greater.

13. The elastomeric composition of claim 1 , wherein the composition has a percent retention in a green rubber-to-rubber tack force from blending to aging at room temperature for 1 month of 20% to 250%.

14. The elastomeric composition of claim 1 , wherein the composition is affixed to a polar substrate, and wherein the composition has a rubber-to-polar substrate tack force of 10 g of force/inch width or greater, wherein the polar substrate is selected from the group consisting of cotton, rayon, polyamide, polyester, aramid, stainless steel, aluminum, glass, carbon, polyketone, polycarbonate, basalt, boron, and oriented discontinuous fibers.

15. An at least partially crosslinked elastomeric composition that is the reaction product of:
a composition according to claim 1 ;
one or more vulcanization activators; and
one or more vulcanizing agents.

16. A belt comprising: the elastomeric composition according to claim 1 .

17. An elastomeric composition comprising:
from 1 to 30 parts by weight per hundred parts by weight rubber (phr) of a propylene-α-olefin-diene (PEDM) terpolymer comprising 70 wt % to 92.5 wt % propylene, 7.5 wt % to 30 wt % a C2 or C4-C12 α-olefin, and 0.5 wt % to 3.4 wt % diene, said wt % based on the weight of the PEDM terpolymer, wherein the PEDM terpolymer has a Mooney viscosity (ML(1+4)) of 10 MU to 100 MU; and
from 70 to 99 phr of an ethylene-based copolymer comprising 40 wt % to 95 wt % ethylene, 0 wt % to 10 wt % of one or more dienes, and 5 wt % to 60 wt % C3 to C12 α-olefin, said wt % based on the total weight of the ethylene-based copolymer.

18. A roofing membrane comprising the composition of claim 17 .

19. A composition comprising:
the elastomeric composition of claim 1 adhered to at least one polyester substrate selected from the group consisting of: a polyester film, a polyester cord, a polyester woven fabric, and a polyester nonwoven fabric.

20. A composition comprising:
the elastomeric composition of claim 1 adhered to at least one substrate selected from the group consisting of: cotton, rayon, polyamide, polyester, polycarbonate, aramid, steel, aluminum, glass, carbon, polyketone, basalt, boron, and discontinuous fibers.

21. The composition of claim 19 or 20 , wherein the substrate comprises a treated surface.

22. The composition of claim 21 , wherein the treated surface comprises a physically bonded coating on the substrate.

23. The composition of claim 21 , wherein the treated surface comprises a chemically bonded coating on the substrate.

24. The composition of claim 22 , wherein the coating comprises the PEDM.

25. The composition of claim 1 , comprising:
from 1 to 40 phr of the PEDM; and
from 99 to 60 phr of the ethylene-based copolymer.

26. The composition of claim 1 , comprising:
from 20 to 30 phr of the PEDM, and
from 80 to 70 phr of the ethylene-based copolymer.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Bai Zhifeng
• Loyd Scott H
• Joshi Milind B
• Zacarias Felix M
• Peng Xiao Bo
• Iwashita Yuya

Classifications

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C09J2467/006

  in the substrate · CPC title

• C09J2423/16

  Presence of ethen-propene or ethene-propene-diene copolymers · 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

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title