Sidewall support for a run flat tire
AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche et Technique S.A.
InventorSik Boen
Life of this patent
Estimating the term…
Abstract
Particular embodiments include run-flat tires having sidewall supports that are manufactured from a rubber composition that is based upon a tin end-functionalized polybutadiene rubber as well as an additional second rubber component and a mixture of carbon blacks. The first carbon black may be characterized as being a low-surface area, high-structure carbon black and the second carbon black may be characterized as a low-surface area carbon black. The low-surface area, high-structure carbon black may be added to the rubber composition in an amount that provides a modulus of elongation at 10% measured at 23° C. of between 8 MPa and 10 MPa.
Claims20
A run-flat tire having a sidewall support, the sidewall support manufactured from a rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable elastomer composition comprising, per 100 parts by weight of rubber:
- a tin end-functionalized polybutadiene rubber;
- a second rubber component;
- a first carbon black, the first carbon black being a low-surface area, high-structure carbon black having a nitrogen surface area of between 15 m2/g and 25 m2/g and a COAN of between 65 ml/100 g and 85 ml/100 g;
- and
- a second carbon black, the second carbon black being a low-surface area carbon black having a nitrogen surface area of greater than 0 m2/g and 11 m2/g, wherein a total loading of the first and second carbon blacks is between 70 phr and 120 phr and wherein the first carbon black is between 20 wt. % and 90 wt. % of the total loading of the first and second carbon blacks.
A run-flat tire having a sidewall support, the sidewall support manufactured from a rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable elastomer composition comprising, per 100 parts by weight of rubber:
- a tin end-functionalized polybutadiene rubber;
- a second rubber component selected from the group consisting of polybutadienes, polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures thereof;
- a first carbon black, the first carbon black being a low-surface area, high-structure carbon black having a nitrogen surface area of between 15 m2/g and 25 m2/g and a COAN of between 65 ml/100 g and 85 ml/100 g;
- and
- a second carbon black, the second carbon black being a low-surface area carbon black having a nitrogen surface area of between 2 m2/g and 11 m2/g, wherein a total loading of the first and second carbon blacks is between 70 phr and 120 phr, wherein the first carbon black is between 10 wt. % and 90 wt. % of the total loading of the first and second carbon blacks, and wherein the first carbon black is included in an amount to provide a modulus of elongation at 10% measured at 23° C. of between 7.5 MPa and 10.5 MPa.
Dependencies are inferred from the claim text.