Patent ID: 6629550
Filing Date: 2003-10-07
Classification: B29D,B60C,C08G,Y10T

Abstract:
A pneumatic tire filling composition comprising a catalytically cured mixture of:(a) from about 3 to about 15 parts by weight of a polyisocyanate comprising polymeric diphenylmethane diisocyanate alone or blended with diphenylmethane diisocyanate or a modified diphenylmethane diisocyanate, wherein said polyisocyanate has an average functionality of greater than 2.3; (b) from about 6 to 65 parts by weight of a plasticizing extender oil, said extender oil having a %H below 10.00; (c) no added polyamine; and (d) an amount to bring the amount of the cured mixture to 100 parts by weight of a high molecular weight polyol or blend of polyols having a hydroxyl number in the range of about 20 to about 31 and having an actual functionality of greater than 2.1, the cured filling composition having a vertical rebound of greater than about 60% based on ASTM D2632 and a Durometer hardness in the range of about 10 to 50 (Shore A).