SIDEWALL SUPPORT FOR A RUN FLAT TIRE

摘要

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.

主权项

1. 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 (phr):
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 between 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.