RIGID FOAM WITH IMPROVED 'K' FACTOR BY REACTING A POLYISOCYANATE PREPOLYMER AND POLYESTER POLYOL CONTAINING LOW FREE GLYCOL

摘要

4/11/89 PATENT B 1299 Rigid cellular polymers are made by reacting an. isocyanate-terminated quasi-prepolymer with a polyol component comprising a polyester polyol having a free glycol content of less than about 7 percent by weight of the polyester polyol in the presence of a blowing agent. The combined use of the quasi-prepolymer and the polyester polyol enhances the thermal insulating properties of the foams.