Patent ID: 6699916
Filing Date: 2004-03-02
Classification: C08F,C08G,Y10T

Abstract:
A method of making a rigid hybrid polyurethane foam, comprising mixing an isocyanate component with a polyol component in the presence of (i) a blowing agent, (ii) at least one polyfunctional (meth)acrylate compound containing an average of at least 2 acrylate or methacrylate groups per molecule and a weight per acrylate or methacrylate group of about 300 daltons or less and (iii) at least one catalyst for the reaction of a polyol or water with a polyisocyanate and subjecting the mixture to conditions sufficient to cause the isocyanate component and polyol component to react and the polyfunctional (meth)acrylate compound to polymerize, thereby forming a rigid hybrid polyurethane foam having a bulk density of 45 pounds per cubic foot (720 kg/m3, or less, wherein the isocyanate component includes an isocyanate-terminated prepolymer having an isocyanate-equivalent weight of from about 150 to about 500 and an average functionality of about 2.7 to about 4.0.