Synthetic elastomer with improved chemical, aging and oil resistance

Claim 1

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst; forming a water slurry product of the resulting ethylene-propylene-nonconjugated diene monomer terpolymer; and solution blending a liquid, high vinyl 1,2-polybutadiene resin with the terpolymer product by adding the 1,2-polybutadiene to the slurry prior to separating and drying the terpolymer elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon.

Claim 2

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst; forming a water slurry product of the resulting ethylene-propylene-nonconjugated diene monomer terpolymer; and solution blending a liquid, high vinyl 1,2-polybutadiene resin with the terpolymer product by adding the 1,2-polybutadiene to the slurry prior to separating and drying the terpolymer elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon.

Claim 3

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst to form an ethylene-propylene-nonconjugated diene monomer terpolymer; stopping the reaction by deactivating the catalyst and forming water slurry product; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and separating and drying the elastomer.

Claim 4

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst to form an ethylene-propylene-nonconjugated diene monomer terpolymer; stopping the reaction by deactivating the catalyst and forming water slurry product; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and separating and drying the elastomer.

Claim 5

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst to form an ethylene-propylene-nonconjugated diene monomer terpolymer; stopping the reaction by deactivating the catalyst; adding water to the solvent solution containing the terpolymer to form a water slurry of the elastomer; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and separating and drying the resulting elastomer; and curing the elastomer with a peroxide curing agent.

Claim 6

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a suitable catalyst to form an ethylene-propylene-nonconjugated diene monomer terpolymer; stopping the reaction by deactivating the catalyst; adding water to the solvent solution containing the terpolymer to form a water slurry of the elastomer; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 80 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and separating and drying the resulting elastomer; and curing the elastomer with a peroxide curing agent.

Claim 7

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a vanadium catalyst to form an ethylenepropylene-nonconjugated diene monomer terpolymer, the terpolymer having an ethylene/propylene ratio in the range of 20/80 to 80/20 and from about 2 to 20 weight percent of the terpolymer of the nonconjugated diene monomer; stopping the reaction by deactivating the catalyst; adding water to the solvent solution containing the terpolymer to form a water slurry of the terpolymer; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 90 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and adding an extender oil to the slurry containing the terpolymer product; separating and drying the resulting elastomer; and curing the elastomer with a peroxide curing agent.

Claim 8

A method of manufacturing a peroxide curable synthetic elastomer with improved chemical aging and oil resistance properties, comprising the steps of: reacting ethylene, propylene and a diene monomer in a solvent solution in the presence of a vanadium catalyst to form an ethylenepropylene-nonconjugated diene monomer terpolymer, the terpolymer having an ethylene/propylene ratio in the range of 20/80 to 80/20 and from about 2 to 20 weight percent of the terpolymer of the nonconjugated diene monomer; stopping the reaction by deactivating the catalyst; adding water to the solvent solution containing the terpolymer to form a water slurry of the terpolymer; adding a liquid, high vinyl 1,2-polybutadiene resin to the slurry product to provide additional cure sites on the resulting elastomer, the 1,2-polybutadiene having at least about 90 mole % 1,2 vinyl structure with a pendant vinyl group for every other chain carbon; and adding an extender oil to the slurry containing the terpolymer product; separating and drying the resulting elastomer; and curing the elastomer with a peroxide curing agent.