Treatment of hazardous material with vapor suppressing, persistent, water-containing, polymeric air foam

Abstract From the Canadian patent

Air is mechanically entrained in an aqueous solution of surfactant and poly(oxyalkylene) polyisocyanate polymer, the poly(oxyalkylene) portion of which contains sufficient oxyethylene units to render the polymer water-soluble and hydrophilic, to form a fluid water-based, air foam which is sprayed or otherwise applied to exposed surface of a substrate, such as a body of hazardous material, the applied foam gelling or increasing in viscosity, due to reaction of the polyisocyanate polymer with water to form a poly(oxyalkylene) polyurea polymer and forming a persistent gelled air foam or viscous air foam in the form of a coating on the exposed surface thus, sealing or otherwise protecting or …