Polyurethane elastomers having improved physical properties and a process for the production thereof

A number average molecular weight of 1,000 to 3,000 Daltons polyol composition, comprising: (1) At least 60% weights' the compound content is parts of propylene polyol, a molecular weight of 2000 to 12,000 Daltons, the non-degree saturation of less than or equal to the 0.02meq/g and (2) is not more than 40% wt% the molecular weight of about 400 to 1,000 Daltons polyatomic alcohol, wherein the disperse index is greater than 1.1. The method for polyol component has good the physical and mechanical property polyurethane elastomer with diisocyanate, the polyisocyanate and isocyanate terminated prepolymer body or prepolymer for preparation of isocyanate terminated. The method of any known preparing polyurethane elastomer, comprising a one-step method, used for the preparation of the invention claims.