# US 11,306,199 B2 · Elastomer formulation using a combination of polymers to create ozone resistance without addition of wax

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- Number: US 11,306,199 B2
- Document ID: US11306199B2
- Status: Granted
- Kind: B2
- Application number: 16/741,037
- Filed: 2020-01-13
- Published: 2020-05-14
- Granted: 2022-04-19
- Earliest claimed: 2016-09-01
- Assignees: Pullman Incorporated
- Applicants: The Pullman Company
- Inventors: Jeanette Pilarski; Joshua R. Goossens
- Web page: https://patentgrep.com/patent/US11306199B2

## CPC

- C08J 3/246: {Intercrosslinking of at least two polymers}
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 7/00: Compositions of natural rubber
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J 2307/00: Characterised by the use of natural rubber
- C08J 2423/16: Ethene-propene or ethene-propene-diene copolymers
- C08L 23/32: by reaction with compounds containing phosphorus or sulfur
- C08L 81/00: Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2312/00: Crosslinking
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A shaped article is formed from a cured rubber composition comprising EPDM and a diene rubber. The shaped article exhibits a coefficient of friction greater than 0.1.

## Claims

### Claim 1

A shaped article formed from a cured rubber composition comprising:
ethylene propylene diene monomer (EPDM) having an organic polymer comprising sulfur covalently incorporated therein;
a diene rubber; and
a curing agent that cures the EPDM having the organic polymer comprising sulfur covalently incorporated therein to the diene rubber,
wherein the article has a coefficient of friction greater than 0.1, and
wherein the EPDM having the organic polymer comprising sulfur covalently incorporated therein is present in the cured rubber composition at a concentration of greater than about 5 wt. % and less than about 25 wt. % based on the total weight of the EPDM and the diene rubber.

### Claim 2 (depends on 1)

The shaped article according to claim 1, wherein the article has a coefficient of friction greater than 0.2.

### Claim 3 (depends on 1)

The shaped article according to claim 1, wherein the article has a coefficient of friction greater than 0.5.

### Claim 4 (depends on 1)

The shaped article according to claim 1, wherein the article has a coefficient of friction from 0.5 to 0.8.

### Claim 5 (depends on 4)

The shaped article according to claim 4, giving a pass on an ozone resistance test according to ASTM D-1149 when subjected to 50 pphm ozone for 72 hours at 40° C.

### Claim 6 (depends on 1)

The shaped article according to claim 1, wherein the article has a coefficient of friction from 0.6 to 0.7.

### Claim 7 (depends on 1)

The shaped article according to claim 1, giving a pass on an ozone resistance test according to ASTM D-1149 when subjected to 200 pphm ozone for 24 hours at 40° C.

### Claim 8 (depends on 1)

The shaped article according to claim 1, wherein the article comprises 25 wt. % EPDM and 75 wt. % diene rubber based on the total weight on the EPDM having the organic polymer comprising sulfur covalently incorporated therein and the diene rubber.

### Claim 9 (depends on 1)

The shaped article according to claim 1, wherein the organic polymer comprising sulfur includes a poly(alkyl phenol) disulfide polymer.

### Claim 10 (depends on 1)

The shaped article according to claim 1, wherein the cured rubber composition does not include a wax.

### Claim 11

A shaped article formed from a cured rubber composition comprising:
a diene; and
an ethylene propylene diene monomer (EPDM) having an organic polymer comprising sulfur covalently incorporated therein,
wherein the diene is cross-linked to the EPDM having the organic polymer comprising sulfur with elemental sulfur.

### Claim 12 (depends on 11)

The shaped article according to claim 11, wherein the EPDM having the organic polymer comprising sulfur covalently incorporated therein is present in the cured rubber composition at a concentration of greater than about 5 wt. % and less than about 25 wt. %.

### Claim 13 (depends on 11)

The shaped article according to claim 11, wherein the organic polymer comprising sulfur includes a poly(alkyl phenol) disulfide polymer.

### Claim 14 (depends on 13)

The shaped article according to claim 13, wherein the shaped article has a coefficient of friction greater than 0.2 and passes an ozone resistance test according to ASTM D-1149 when subjected to 200 pphm ozone for 24 hours at 40° C.