Process for applying polyurethane foams to substrates

Abstract From the Canadian patent

This invention is directed to a polyurethane foam composition which is suitable as a hacking for a substrate and to a substrate containing the polyurethane foam composition. The foam composition is the reaction product of a frothed polyurethane forming mixture comprising a relatively high molecular weight polyether polyol, a relatively low molecular weight polyol, an organic polyisocyanate or polyisothiocyanate, an inorganic filler, a catalyst for urethane formation, and a silicone surfactant. The silicone surfactant is a poly(dimethylsiloxane) polyoxyalkylene branch copolymer having an average molecular weight of less than 30,000 wherein at least 60 percent by weight of the polyoxyalkylene …