Rubber compositions containing viscosity modifier and related methods
AssigneeBridgestone Americas Tire Operations, LLC
InventorsEmily A. Welles, Michael P. Singleton, Amy M. Randall
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Abstract
Disclosed herein are rubber compositions containing a viscosity modifier and related methods such as for preparing a rubber composition containing a viscosity modifier. The viscosity modifier is an olefin copolymer and may be utilized in a neat or in an oil-extended form. Use of the olefin copolymer viscosity modifier can improve both high and low temperature E of the rubber composition.
Claims20
A rubber composition comprising:
- a. 100 parts of at least one rubber;
- b. at least one olefin copolymer viscosity modifier in an amount of 0.5 to 10 phr;
- c. at least one reinforcing filler in an amount of 5 to 200 phr;
- and
- d. a cure package,
- wherein the at least one olefin copolymer viscosity modifier has a Mn of 2,000 to 1,000,000 grams/mole.
A tire tread rubber composition having improved snow traction and cornering, comprising:
- a. 100 parts of at least one rubber including a majority by weight of at least one of:
- natural rubber, polybutadiene, polyisoprene, or styrene-butadiene copolymer;
- b. at least one olefin copolymer viscosity modifier in an amount of 0.5 to 10 phr;
- c. at least one reinforcing filler in an amount of 5 to 200 phr including silica, optionally in combination with at least one carbon black;
- and
- d. a cure package,
- wherein the at least one olefin copolymer viscosity modifier has a Mn of 2,000 to 1,000,000 grams/mole.
A method for preparing a rubber composition, the method comprising combining
- (a) 100 parts of at least one rubber;
- (b) at least one olefin copolymer viscosity modifier in an amount of 0.5 to 10 phr;
- (c) at least one reinforcing filler in an amount of 5 to 200 phr;
- and
- (d) a cure package,
- wherein the at least one olefin copolymer viscosity modifier has a Mn of 2,000 to 1,000,000 grams/mole.
Dependencies are inferred from the claim text.