Puncture-sealant tire

Claim 1

In a self-sealing tubeless pneumatic tire comprising a hollow casing of fabric-reinforced, cured, rubberlike, elastic material and having a circUmferential thread disposed along its crown area, opposite sidewalls extending radially inward therefrom with inextensible bead rings at the inner edges of said sidewalls and an inner liner of cured, rubberlike material which is impermeable to air and extends from bead to bead along the entire inner surface thereof; the combination therewith of a first layer of puncture sealing material disposed circumferentially along said crown area between said fabric-reinforced material and said inner liner and a second layer of puncture sealing material disposed inwardly of said inner liner circumferentially along the crown area of said tire, said first layer of sealing material in the green tire being devoid of rubber curatives, while said second layer of sealing material contains a sufficient amount of such curatives to increase the viscosity of the material in said second layer enough to prevent is from flowing during normal use of the tire to such an extent that the tire would become unbalanced, each said sealant layers being not in excess of 0.120 inch in thickness.