Patent ID: 8557946

Claim:
A polyurethane foam produced from a formulation comprising: a polyol; an isocyanate; a blowing agent; a first phosphite ester, the first phosphite ester being reactive with at least one of the polyol and the isocyanate; and a second phosphite ester, the second phosphite ester being substantially non-reactive with each of the polyol, the isocyanate, and the first phosphite ester, wherein the polyurethane foam is resistant to discoloration from oxides and resistant to scorch; wherein the formulation further comprises a surfactant, and the polyurethane foam is an open cell foam; wherein the total weight percentage of the first and second phosphite esters combined in the formulation is up to about 15%; and wherein the first phosphite ester is present in an amount of at least about 5 parts per hundred parts polyol, and the second phosphite ester is present in an amount of at least 5 parts per hundred parts polyol.