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Method for providing a low density high strength polyurethane foam

United States Patent

June 18, 2013
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
Disclosed is a method for making a polyurethane closed-cell foam material exhibiting a bulk density below 4 lbs/ft.sup.3 and high strength. The present embodiment uses the reaction product of a modified MDI and a sucrose/glycerine based polyether polyol resin wherein a small measured quantity of the polyol resin is "pre-reacted" with a larger quantity of the isocyanate in a defined ratio such that when the necessary remaining quantity of the polyol resin is added to the "pre-reacted" resin together with a tertiary amine catalyst and water as a blowing agent, the polymerization proceeds slowly enough to provide a stable foam body.
Whinnery, Jr.; Leroy L. (Danville, CA), Goods; Steven H. (Livermore, CA), Skala; Dawn M. (Fremont, CA), Henderson; Craig C. (Falls Church, VA), Keifer; Patrick N. (Livermore, CA)
Sandia Corporation (Albuquerque, NM)
11/ 712,283
February 27, 2007
STATEMENT OF GOVERNMENT SUPPORT The United States Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation.