METHOD FOR PRODUCING A POLYURETHANE FOAM BY MEANS OF A SUPERCRITICAL OR NEAR-CRITICAL PROPELLANT

摘要

The present invention relates to a method for producing a polyurethane foam, wherein the propellant used is present in the supercritical or near-critical state. A reaction mixture is introduced into a closed mold, wherein the closed mold is set up such that the inner volume thereof and/or the pressure in the interior thereof can be changed by external effects after introducing the mixture. By selecting the surfactant, microemulsions of the propellant can be obtained in the polyol phase. The invention further relates to a nanocellular polyurethane foam that can be obtained by means of the method according to the invention.