초록 ▼

A pneumatic tire of the tubeless type, embodying a layer of puncture sealant composition based on: A. a major proportion of a low molecular weight elastomer (e.g., depolymerized natural rubber) in admixture with a tackifying or plasticizing substance (e.g., a resinous reaction product of a mineral o

A pneumatic tire of the tubeless type, embodying a layer of puncture sealant composition based on: A. a major proportion of a low molecular weight elastomer (e.g., depolymerized natural rubber) in admixture with a tackifying or plasticizing substance (e.g., a resinous reaction product of a mineral oil purification residue with formaldehyde) and B. a minor proportion of a high molecular weight elastomer (e.g., cis-polyisoprene); CONTAINING A CROSSLINKING AGENT (E.G., TETRA-N-BUTYL TITANATE) IN AN AMOUNT SUFFICIENT TO GIVE A PARTIAL CURE.

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A puncture sealing composition for a tubeless pneumatic tire comprising a fiber-free blend of A. a major proportion by weight of a low molecular weight liquid elastomer in admixture with a tackifying or plasticizing substance, and B. a minor proportion by weight of a high molecular weight solid elas

A puncture sealing composition for a tubeless pneumatic tire comprising a fiber-free blend of A. a major proportion by weight of a low molecular weight liquid elastomer in admixture with a tackifying or plasticizing substance, and B. a minor proportion by weight of a high molecular weight solid elastomer, and a crosslinking agent for the elastomers in amount effective to partially crosslink the elastomers to an extent sufficient to prevent the blend from flowing at elevated temperatures and centrifugal forces encountered in the tire in use, the blend having in the partially crosslinked state sufficient adhesion and conformability to function as a sealant in the tire, the amount of (A) being from more than 50% to 90% by weight and the amount of (B) being correspondingly from less than 50% to 10% by weight, based on the combined weights of (A) and (B), the said low molecular weight elastomer being a liquid rubber having a Brookfield viscosity at 150°F of from 20,000 to 2,000,000 cps and the said high molecular weight elastomer having a Mooney viscosity of from 20 to 160 ML-4 at 212°F, the said crosslinking agent being selected from the following, present in the amounts recited: from more than 0.5 to 2.0 parts of sulfur or sulfur-yielding curative; from more than 0.5 to 2.0 parts of quinoid curative; from 0.1 to 1.0 part of radical generating curative; from 2 to 10 parts of polyisocyanate curative; and from 2 to 10 parts of tetrahydrocarbyl titanate ester curative, the said parts of crosslinking agent being by weight based on 100 parts of the combined weight of the two elastomers, the gel content of the blend in the partially crosslinked state being from 15 to 60% by weight of the blend, as measured in toluene at room temperature, and the peak Mooney viscosity of the blend in the partially crosslinked state being from 30 to 55 ML at 150°F.