Patent ID: 6548616
Filing Date: 2003-04-15
Classification: B29C,B29K,B60C,C08G,Y10T

Abstract:
A lightweight tire support for use in a run flat tire, the light weight tire support being comprised of a polyurethane that is the reaction product of:(A) a polyol having a molecular weight of at least about 4500; (B) a chain extender; and (C) an isocyanate, the isocyanate being present in an amount effective to react with the chain extender to provide a hard-segment polymer and in an amount effective to react with the polyol to provide a soft-segment polymer such that the polyurethane has a tensile modulus that changes by no more than 15 percent over a temperature range of âˆ’50Â° C. and 150Â° C. based on dynamic mechanical spectroscopy and the tensile modulus is at least 20 MPa at 80Â° C. and no greater than 60 MPa at 80Â° C. as determined by ASTM D638.