Patent ID: 6022903
Filing Date: 2000-02-08
Classification: C08G,C08J

Abstract:
A microcellular polyurethane elastomer having a density between about 0.2 g/cm.sup.3 and 0.8 g/cm.sup.3 having microcells filled with one or more permanent, non-organic gas(es), said elastomer prepared by frothing at least one isocyanate-terminated polyoxyalkylene prepolymer prepared by reacting a stoichiometric excess of one or more di- or polyisocyanates with a polyoxyalkylene polyol component having an average equivalent weight greater than about 1000 Da, and at least one polyoxyalkylene polyol composition, said polyoxyalkylene polyol composition having an average equivalent weight of at least about 1000 Da, an average functionality of about 2.0 or more, and optionally in addition to said polyol composition, 50 equivalent percent or more based on reactive isocyanate groups of an aliphatic glycol chain extender having a molecular weight below 300 Da to prepare a curable froth, and introducing said froth into a mold and allowing said froth to cure, wherein polyoxyalkylene polyols having unsaturation lower than 0.015 meq/g comprise minimally 35 weight percent of total polyoxyalkylene polyol in said polyoxyalkylene polyol component and said polyoxyalkylene polyol composition taken together.