Silica containing tire compositions for suppression of static charge accumulation
AssigneeBridgestone/Firestone, Inc.
InventorMario N. Detrano
Life of this patent
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Abstract
Rubber tire component compositions containing silica have effective amounts of extra conductive carbon black to dissipate static electricity. The volume resistivity in Ohm-centimeters of the component such as a tread is generally 108 or less. The extra conductive carbon black generally has a BET surface area of at least 500 square meters per gram and the silica is generally utilized in amounts of at least 20 parts by weight per 100 parts by weight of the rubber.
Claims16
A tire component composition having suppressed static electricity accumulation, comprising:
- approximately 100 parts by weight of a least one tire component rubber, from 27 to about 90 parts by weight of silica per 100 parts by weight of said tire component rubber;
- from about 2 percent to about 20 percent by weight of a silica coupling agent based upon the total weight of said silica, and
- an effective amount of an extra conductive carbon black so that the wherein the amount of said extra conductive carbon black so that the tire component composition has a volume resistivity of 108 Ohm-cm or less.
A process for improving the conductivity of a silica containing cured tire tread composition, comprising:
- adding an effective amount of an extra conductive carbon black having a BET surface area of at least 500 square meters per gram to a silica tire tread composition having at least one rubber therein to suppress static electricity accumulation,
- adding an effective amount of a silica coupling agent to chemically bind the silica to the rubber
- forming a tire tread, and
- curing said tire tread.
A process according to claim 13, including adding conventional carbon black to said silica tire tread composition in an amount of from about 15 to about 40 parts by weight per 100 parts by weight of said rubber, and wherein the amount of said extra conductive carbon black is from about 5 parts to about 15 parts by weight.
Dependencies are inferred from the claim text.