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AssigneeR. T. Vanderbilt Company, Inc.
InventorsRichard A. Suhoza, Thomas J. Karol, James J. Talbot
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Polyether and polyester poloyols and polyurethane foams are stabilized by including therein stabilizers selected from (1) diphenylaminomethylbenzotriazole substituted by alkyl or phenylalkyl groups or (2) synergistic compositions consisting of (a) benzotriazole or alkylbenzotriazole and (b) secondary aromatic amine substituted by alkyl or phenylalkyl groups wherein the benzotriazole and amine is present in critical ratios. Furthermore, a method is disclosed for preparation of polyurethane foams from polyols and polyisocyanate that have reduced discoloration due to scorch by adding diphenylamino methylbenzotriazole or compositions of benzotriazole and secondary aromatic amine as scorch inhibitors to the polyol, foaming the polyol and curing.
In the preparation of polyurethane foams by reacting a polyol and polyisocyanate compound in the presence of water, a catalyst and a surfactant, an improved method of reducing discoloration due to scorch of polyurethane foam comprising the steps of (i) adding to the polyol about 0.01 to 5.0 percent by weight of a stabilizer consisting essentially of a benzotriazole compound of the formula
In the preparation of polyurethane foam by reacting a polyol and polyisocyanate compound in the presence of water, a catalyst and a surfactant, an improved method of reducing discoloration due to scorch of polyurethane foam comprising the steps of
Dependencies are inferred from the claim text.