Patent ID: 8598247

Claim:
A process for preparing an elastomer including a step of contacting under reaction conditions: (a) an isocyanate component comprising an isocyanate-terminated prepolymer having an isocyanate (NCO) content of 10 to 30 weight percent where the isocyanate-terminated prepolymer consists of the reaction product of a stoichiometric excess of one or more di- or poly-isocyanate compounds with a first polyol component; (b) a second polyol component; (c) an effective amount of a blowing agent to provide a polyurethane elastomer with a density of from 200 to 1200 kg/m 3 ; (d) optionally, a chain extender; and (e) optionally, at least one additive selected from the group consisting of a catalyst, surfactant, filler, pigment, fire retardant, antioxidant, antistatic agent and combinations thereof; wherein (a) and (b) are used at an isocyanate index of from 85 to 115, and wherein the first polyol component consists of at least one polyester polyol which does not comprise a hydroxymethyl group as a pendant group and which is obtainable as the reaction product of at least one polycarboxylic acid and at least one alcohol having from about 2 to about 8 hydroxyl groups, and the second polyol component comprises at least one polyester polyol which comprises at least one hydroxymethyl group as a pendant group and at least one other isocyanate reactive material, and the total amount of polyester polyol which comprises at least one hydroxymethyl group as a pendant group used in the second polyol component is at least about 10 and at most about 80 weight percent of the second polyol component.