Patent ID: 6756416
Filing Date: 2004-06-29
Classification: C08G,C08J

Abstract:
A method for making a hydrophilic ester polyurethane foam, comprising:(a) forming a polyurethane foam by mixing together the following components: (i) 100 parts by weight of an ester polyol mixture, wherein at least 5.0 parts by weight of the ester polyol mixture comprises a hydrophilic polyester polyol made from an adipic acid and a polyethylene glycol; (ii) from 20.0 to 62.0 parts by weight, based on 100 parts polyol, of an isocyanate, wherein the isocyanate index is 110 or less; and (iii) from 1.0 to 3.0 parts by weight, based on 100 parts polyol, of a silicone stabilizing surfactant; and (b) treating the polyurethane foam in a caustic bath to form the hydrophilic ester polyurethane foam, wherein the hydrophilic ester polyurethane foam has a water absorption rate of at least 20 pounds of water per square foot per minute.