Rubber composition with improved processability
AssigneeCompagnie Generale Des Etablissements Michelin
InventorsPedro Henrique SABADIN DE AZEVEDO, Brian R. BERGMAN, Anthony CATO, Gabriel SANTANA
Life of this patent
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Abstract
An improved rubber composition having improved extrudate properties and exhibiting superior tolerance to aging when subject to multi-step mixing process and in particular to a mixing process where the rubber composition is mixed in a first mixer, cooled by passing between a pair of cylinders, then mixed in a second mixer, the composition comprised of a disulfide silane.
Claims14
A tread for a tire, the tread comprising a rubber composition that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per hundred parts by weight of rubber (phr):
- 100 phr of rubber selected from the group consisting of between 0 phr and 20 phr of natural rubber, between 0 phr and 100 phr of functionalized styrene-butadiene rubber, between 0 phr and 100 phr of non-functionalized styrene-butadiene rubber, between 0 phr and 50 phr of polybutadiene rubber, and combinations thereof;
- a plasticizer system comprising between 10 phr to 30 phr of a plasticizing resin and 0 phr to 40 phr of plasticizing liquid;
- between 60 phr and 125 phr of a silica filler;
- a disulfide silane;
- and
- a sulfur curing system.
The rubber composition of any one of the above claims wherein the disulfide silane is bis(triethoxysilylpropyl)disulfide.
The rubber composition of any one of the above claims wherein the silica filler represents 10% to 40% of the composition by weight of the entire composition.
The rubber of any one of the above claims wherein it is made by a process comprising:
- mixing a composition comprising the rubber, the silica filler and the disulfide silane in a first mixer;
- cooling the rubber mixture by:
- passing the rubber mixture through a pair of cylinders for forming the mixture into a rubber sheet;
- and
- spraying the rubber with a cooling liquid;
- mixing the rubber mixture an additional time in a second mixer;
- and
- extruding the rubber mixture through an extruder.
The rubber composition of any one of the above claims wherein the rubber composition is vulcanized into a finished product.
Dependencies are inferred from the claim text.