POLYURETHANE COMPOSITION

摘要

A method of producing a polyurethane having a density of from 0.3 to 0.7 g/cc and improved physical and dynamic properties comprising preheating a prepolymer consisting of 4,4'-diphenylmethane di-isocyanate and a polymeric polyol having a molecular weight of at least 1000 and mixing said prepolymer with a resin mixture of a polymeric polyol which may be the same as the first polyol.