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AssigneeDow Global Technologies LLC
InventorsDwight D. Latham, Hongming Ma
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Methods of forming olyurethane foams that are the reaction product of at least one polyisocyanate and a polyol composition are provided. The polyol composition includes at least one natural oil based polyol and at least one poly(propylene oxide) polyol and is desirably free of non-natural oil based polyols made from alkylene oxide units, other than propylene oxide units. The natural oil based polyol is present in a quantity sufficient to increase the processing window for the foam relative to a foam made using the same process and the same components, absent the natural oil based polyol. As a result, the present foams can provide very open-cellular structures with the superior performance properties of a poly(propylene oxide) polyol-based foam.
A method for forming a polyurethane foam, the method comprising contacting a polyisocyanate with a polyol composition comprising at least one natural oil based polyol and at least one poly(propylene oxide) polyol, in the presence of a tin-based catalyst, a blowing agent and a surfactant, under conditions in which a polyurethane foam is formed, wherein the polyol composition is free of non-natural oil based polyols formed from alkylene oxides other than propylene oxide and the natural oil based polyol comprises no greater than 10 weight percent of the polyol composition, such that the tin processing window for the foam is broader and extends to lower tin catalyst concentrations relative to a corresponding natural oil based polyol-free foam.
Dependencies are inferred from the claim text.