Patent ID: 8883934

Claim:
A process for preparing a polyurethane, comprising blending a mixture of ethylene oxide-capped polypropylene oxides with a polyisocyanate and subjecting the resulting blend to conditions sufficient to cure the blend to form a resilient, flexible polyurethane foam wherein the mixture of ethylene oxide-capped polypropylene oxides each has a hydroxyl equivalent weight of from 1700 to 2200 and containing at least 70% primary hydroxyl groups, wherein from 5 to 80% by weight of the ethylene oxide-capped polypropylene oxides are nominally difunctional, from 1 to 5% by weight of the ethylene oxide-capped polypropylene oxides have a nominal functionality from 6 to 8, and from 10 to 94.5% by weight of the ethylene oxide-capped polypropylene oxides, are nominally trifunctional.