Patent ID: 9493041
Filing Date: 2016-11-15
CPC Classification: B60C,C08L

Claim Text:
1. A run-flat tire comprising a side wall portion, a tread, a carcass, a bead core, and a bead filler, said bead filler employing a rubber composition obtained by adding 3 to 10 parts by mass of sulfur and 20 to 30 parts by mass of a low-molecular-weight conjugated diene-based polymer (B) having a weight average molecular weight in terms of polystyrene standard in the range of 4,000 to 8,000 measured with a gel permeation chromatography and which is at least one of a homopolymer of 1,3-butadiene and a poly(styrene-co-1,3-butadiene), to 100 parts by mass of a rubber component (A) containing at least a natural rubber or polyisoprene rubber and having a weight average molecular weight in terms of polystyrene standard in the range of 150,000 to 2,000,000 measured with the gel permeation chromatography, wherein in the polymer (B), the percentage of an aromatic vinyl compound unit relative to all monomer units is less than 4% by mass, and the percentage of a vinyl bonding amount in the conjugated diene compound moiety is in the range of 30% to 80%, and wherein the rubber component (A) further comprises at least one type selected from the group consisting of a styrene-butadiene copolymer rubber and a polybutadiene rubber.