Patent ID: 8557886

Claim:
A storage-stable polyol composition consisting essentially of (a) from about 1 to about 20 percent by weight of an aliphatic polyester polyol having a hydroxyl number of less than about 100, wherein the aliphatic polyester polyol is prepared by the reaction of at least a polycarboxylic acid, or an anhydride of the polycaroxylic acid, with a polyhydroxy compound; (b) from about 1 to about 60 percent by weight of an aromatic polyester polyol; (c) from about 1 to about 60 percent by weight of a Novolac-type polyether polyol; and (d) from about 1 to about 20 percent by weight of a hydrofluorocarbon blowing agent; wherein the weight percent ratio of aromatic polyester polyol to aliphatic polyester polyol is from about 80:20 to about 30:70 and the polyol composition does not exhibit phase separation, as determined by unenhanced visual inspection, for a period of at least 60 days under ambient conditions.