Patent ID: 6031010
Filing Date: 2000-02-29
Classification: C08G

Abstract:
A flexible integral skin polyurethane foam prepared by intimately contacting under effective reaction conditions a polyisocyanate composition with an isocyanate reactive composition in the presence of a water blowing agent, wherein(a) the polyisocyanate composition has a free NCO value of about 15% to about 25% by weight and comprises an isocyanate terminated prepolymer prepared from the reaction of an excess of organic polyisocyanate and a first ethylene oxide capped polymer polyol having an average nominal hydroxyl functionality of 2-6, an equivalent weight ranging from about 700 to about 5,000 and an ethylene oxide content of at least about 25% by weight, whereby at least 50% of the ethylene oxide group is present at the end of the polyether polyol;(b) the isocyanate reactive composition comprises a chain extending agent that is present in amounts ranging from about 6.0% to about 12.5% by weight, and a mixture of a second ethylene oxide capped polyether polyol and a random copolymer of ethylene oxide and propylene oxide in synergistically effective amounts to form said polyurethane foam, said second ethylene oxide capped polyol having an average nominal hydroxyl functionality of 2-3, an equivalent weight ranging from about 700 to about 5000 and an ethylene oxide content of at least weight 25% by weight thereof wherein at least about 50% of the ethylene oxide group being present at the end of the polyether polyol and said copolymer having an average nominal hydroxyl functionality of 2-3, an equivalent weight ranging from about 700 to about 5000 and an ethylene oxide content of at least about 60% by weight; and(c) water, as the sole blowing agent present in an amount effective to provide the resulting polyurethane with a density ranging from about 0.1 to about 1.1 sp.gr, wherein the weight ratio of water to the chain extending agent ranges from about 0.01 to about 0.20.