Arnco Corporation

Norman E Rustad

Juanito G Santero

Bhanubhai D Patel

The present invention is directed to a method for producing a cured tire filling composition and the composition resulting from such a method. A mixture of a polyisocyanate having an average functionality of at least 2.3; a high molecular weight polyol having a hydroxyl number in the range of about 20 to about 31 and having an actual functionality of greater than 2.1; 6 to 65 weight percent of a polar plasticizing extender oil; and no greater than 0.5 weight percent polyamine is cured in the presence of a catalyst to form a polyurethane elastomer having a vertical rebound of greater than about 60% based on ASTM D2632 and a Durometer hardness in the range of about 5 to 60 (Shore A). The mixture is used to fill a tire prior to curing the composition within the tire casing and results in a deflation-proof tire that has considerably longer road testing life than tire filling compositions currently available.

Method for producing a deflation-proof pneumatic tire and tire filling composition having high resilience

A very soft polyurethane composition is provided having a low level of an aromatic phosphate or phosphonate plasticizer that will perform well as a self-sealing liner to flat-proof pneumatic tires, and will withstand the high temperatures of the tire retread process and still be functional. The liner is produced by a method of meter-mixing an isocyanate component and a high molecular weight polyol component system that can be poured directly into the tire to be lined as it is being rotated to spread the material uniformly in the tire until it sets up and will not cold flow. Also, the meter-mixed liner material can be poured on a flat surface of release paper to form sheet stock that can be cut into strips and then applied to the inner lining of the tire at a later time.

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Seal Beach, CA, United States of America

Norman E Rustad