Patent ID: 8802746

Claim:
A flexible isocyanate-based polymer foam produced from a formulation comprising: an isocyanate; a blowing agent consisting essentially of water; a first active hydrogen-containing compound; and a second active hydrogen-containing compound different than the first active hydrogen-containing compound and excluding tris(dipropyleneglycol) phosphite, the second active hydrogen-containing compound consisting essentially of an anti-yellowing amount of an active hydrogen-containing phosphite compound having the following formula wherein: R 1 , R 2 and R 3 may be the same or different and each is selected from the group comprising a C 1 -C 40 aliphatic group optionally containing one or more heteroatoms, C 5 -C 40 aromatic group optionally containing one or more heteroatoms and a C 5 -C 50 araliphatic group optionally containing one or more heteroatoms; X 1 , X 2 and X 3 may be the same or different and each is selected from the group comprising hydroxyl, amino, carboxy, thiol and amido; and n is an integer in the range of from 1 to 10, and wherein the second active hydrogen-containing compound is present in the formulation in an amount in the range from of about 0.5 to about 3.0 parts by weight per 100 parts by weight of the first active hydrogen-containing compound, wherein, for a period of 48 hours after production, the foam has a B* value of up to about 90 percent of the B* value of a control foam produced from a control formulation identical to the formulation with the proviso that the control formulation is free of the second active hydrogen-containing compound.