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US 12,215,231 B2Granted
Tire tread rubber composition
AssigneeBridgestone Americas Tire Operations, LLC
InventorsJames P. Kleckner, Anthony M. Unger, Benjamin C. Galizio
Life of this patent
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Abstract
Disclosed herein are tire tread rubber compositions comprising a specified elastomer component, reinforcing silica filler, a specified hydrocarbon resin, a cure package, and optionally oil. The elastomer component includes styrene-butadiene rubber and polybutadiene.
Claims19
A tire tread rubber composition comprising:
- a. 100 parts of an elastomer component comprising
- i. 30-50 parts of solution-polymerized styrene-butadiene rubber,
- ii. 30-50 parts of polybutadiene rubber having a cis bond content of at least 95% and a Tg of less than −101° C., and
- iii. 20-40 parts of natural rubber consisting of guayule natural rubber,
- wherein any additional diene-monomer containing rubber is present in an amount of no more than 5 parts,
- b. at least one reinforcing silica filler in an amount of 81-120 phr,
- c. no more than 15 phr of carbon black filler,
- d. 11-35 phr of at least one hydrocarbon resin having a Tg of about 30 to about 50° C.,
- e. 0-40 phr oil, and
- f. a cure package,
- wherein the total amount of (d) and (e) is no more than 59 phr.
8 more elements
Dependencies are inferred from the claim text.