Tire tread rubber composition
AssigneePirelli Armstrong Tire Corporation
InventorTomasz S. Mroczkowski
Life of this patent
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Abstract
An abrasion-resistant halogenated isobutylene-based rubber composition having good traction characteristics is disclosed. In a preferred embodiment, the composition comprises a halogenated isobutylene rubber, styrene/butadiene rubber and polybutadiene rubber combined with carbon black and a silane-coupled silica filler. In automobile tire treads, tire retreads, and other anti-skid materials, the composition exhibits viscoelastic properties offering excellent traction and good rolling resistance with no loss in tire treadwear.
Claims23
A tire tread rubber composition which comprises 90 to 70 parts, per hundred parts rubber, a mixture of butadiene rubber and styrene-butadiene rubber, and 10 to 30 parts, per hundred parts rubber, halogenated isobutylene rubber, and further comprising 10 to 30 parts, per hundred parts rubber, silica and 1 to 8 parts, per hundred parts rubber, of an organosilane cross-linking agent.
An abrasion-resistance tire tread rubber composition which comprises:
- (a) a rubber component comprising 10 to 30 parts, per hundred parts rubber, halogenated isobutylene rubber and 90 to 70 parts, per hundred parts rubber, a mixture of styrene-butadiene rubber and butadiene rubber;
- (b) 10 to 30 parts, per hundred parts rubber, silica filler;
- and
- (c) 1 to 8 parts, per hundred parts rubber, of an organosilane cross-linking agent
- and exhibiting higher hysteresis loss at lower temperatures and lower hysteresis loss at higher temperatures than a control composition formulated without the halogenated isobutylene rubber.
A method for producing a tire tread composition which comprises:
- (a) blending 10 to 30 weight percent halogenated isobutylene rubber with 90 to 70 weight percent of a mixture of styrene-butadiene rubber and butadiene rubber, 10 to 30 parts, per hundred parts rubber, silica and 1 to 8 parts, per hundred parts rubber, of an organosilane cross-linking agent and effective amounts of processing aids to form a mixture;
- (b) adding antioxidants, antiozonants, and effective amounts of processing aids;
- and
- (c) blending into said mixture an effective amount of cross-linking materials, cure accelerators, and cure activators.
A tire having a tire tread comprising a rubber composition which comprises 10 to 30 parts, per hundred parts rubber, isobutylene/para-bromomethylstyrene rubber and 90 to 70 parts, per hundred parts rubber, a mixture of styrene-butadiene rubber and butadiene rubber;
- 10 to 30 parts, per hundred rubber, silica;
- and 1 to 8 parts, per hundred parts rubber, an organosilane cross-linking agent.
Dependencies are inferred from the claim text.