Patent ID: 6433032
Filing Date: 2002-08-13
Classification: C08G,C08J,Y10T

Abstract:
Process for the preparation of an open-celled rigid polyurethane or urethane-modified polyisocyanurate foam comprising:reacting a polyisocyanate composition with a polyfunctional isocyanate-reactive composition under foam-forming conditions, wherein the polyisocyanate composition has a free NCO-value of 21 to 30% by weight and comprises the reaction product of a stoichiometric excess of an organic polyisocyanate and an isocyanate-reactive material comprising a polyether polyol having a molecular weight between 1000 and 10000 and an average nominal hydroxyl functionality of from 2 to 6 and containing from 10 to 50% by weight of oxyethylene units.