PNEUMATIC TIRE

摘要

Pneumatic tire wherein a rubber layer (A) is disposed as an inner liner at an innermost layer side of the tire, and a rubber layer (B) disposed between the above inner liner and a carcass ply layer and adjacent to the above inner liner comprises a rubber composition containing a natural rubber alone or a natural rubber and a synthetic diene rubber as a rubber component, wherein rubber layer (A) contains a butyl rubber alone or a blend rubber of a diene rubber and a specific amount of a butyl rubber as a rubber component; rubber layer (B) contains a bismaleimide compound as a cross-linking agent, sulfur and a vulcanization accelerator; a blend amount of the sulfur and a blend amount of the vulcanization accelerator are modified to specific ranges; and an elongation at break after subjected to air heat aging at 100° C. for 250 hours is 150% or more.

主权项

1. A pneumatic tire in which a rubber layer (A) having an excellent air impermeability is disposed as an inner liner at an innermost layer side of the tire and in which a rubber layer (B) disposed between the inner liner and a carcass ply layer and adjacent to the inner liner comprises a rubber composition containing a natural rubber alone or a natural rubber and a synthetic diene rubber as a rubber component, wherein the rubber layer (A) contains:
a butyl rubber alone or a blend rubber of a diene rubber and a butyl rubber as a rubber component, and 30 parts by mass or more of the butyl rubber is contained based on 100 parts by mass of the rubber component; the rubber layer (B) is composed of a rubber composition 0.5 to 2.3 parts by mass of sulfur when less than 1.0 part by mass of a bismaleimide compound as a cross-linking agent is contained based on 100 parts by mass of the rubber component or 0.4 to 2.3 parts by mass of the sulfur when 1.0 part by mass or more of the bismaleimide compound as a cross-linking agent is contained based on 100 parts by mass of the rubber component, and 0.5 to 3.0 parts by mass of a vulcanization accelerator and in which a blend amount of the sulfur and a blend amount of the vulcanization accelerator satisfy the following equation (I); and an elongation at break after subjected to air heat aging at 100° C. for 250 hours is 150% or more:
(vulcanization accelerator)≦(−2.14)×(sulfur)+5.43  (I).