Patent ID: 8791168
Filing Date: 2014-07-29
Classification: C08G,C08L

Abstract:
1. A viscoelastic polyurethane foam comprising the reaction product of a mixture that includes at least one natural oil derived polyol, at least one organosilicone surfactant, water, at least one catalyst, and at least one aromatic compound having an average of more than one isocyanate group, the at least one natural oil derived polyol being a hydroxymethyl-containing polyester polyol having an average structure: wherein: R is the residue of an initiator compound having n hydroxyl and/or primary or secondary amine groups; n is at least two; each X is independently —O—, —NH— or —NR′— in which R′ is an inertly substituted alkyl, aryl, cycloalkyl, or aralkyl group; p is a number from 1 to n representing the average number of [X—Z] groups per hydroxymethyl-containing polyester polyol molecule; and Z is a linear or branched chain of residues of fatty acids, the hydroxymethyl-containing polyester polyol includes an average of at least 1.3 repeating units derived from a hydroxymethyl-group containing fatty acid or ester thereof for each hydroxyl, primary amine, and secondary amine groups in the initiator compound, and has an equivalent weight of from 400 to about 15,000, the at least one natural oil derived polyol is at least from about 20 and to about 80 weight percent of the total polyols used to make the foam with the remainder of the polyol being at least one polyether polyol, polyester polyol, or a combination thereof, and the viscoelastic foam has a resilience of at most 10 percent measured according to the procedures of ASTM D3574-Test H.