Elastomer formulation using a combination of polymers to create ozone resistance without addition of wax

Patent metadata

Field	Value
Publication number	US-11306199-B2
Application number	US-202016741037-A
Country	US
Kind code	B2
Filing date	Jan 13, 2020
Priority date	Sep 1, 2016
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

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.

First claim

What is claimed is:

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.

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

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

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

5. 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.

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

7. 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.

8. 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.

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

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

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.

12. 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. %.

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

14. 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.

Assignees

• Pullman Co

Inventors

• Pilarski Jeanette
• Goossens Joshua R

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08K2003/2296

  of zinc · CPC title

• C08K2201/014

  Additives containing two or more different additives of the same subgroup in C08K · CPC title

• C08L23/32

  by reaction with compounds containing phosphorus or sulfur · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title