Inventors:
David Gerald Wernsing - Littleton CO
Carol Jean Claypool - Lakewood CO
Assignee:
Inspec Foams, Inc. - Plano TX
International Classification:
C08J 902
C08G 1834
Abstract:
A lightweight open celled foam, having a density no greater than 0. 5 pounds per cubic foot (pcf), preferably between 0. 1 and 0. 4 pcf, and a ratio of imide to amide groups greater than 1 to 1 and no greater than 19 to 1, is the reaction product made from an organic polyisocyanate having at least two functional groups per molecule and a mixture of a difunctional acid and a difunctional anhydride in the presence of a tertiary amine catalyst and a surfactant, with the reactants generating carbon dioxide during the manufacturing process. The reaction is interrupted when the amount of carbon dioxide generated from the reactants is from about 1% to about 8% by weight of the total mass of the reactants. The reaction mass is transferred after the interruption step to a second stage to complete the generation of carbon dioxide and the formation of the low density foam product.