VERY LOW DENSITY MOLDED POLYURETHANE FOAMS VIA ISOCYANATE-TERMINATED PREPOLYMERS

摘要

Very soft, very low density, all water-blown polyurethane foams are prepared by reacting an isocyanate-terminated prepolymer with from 30% to 150% stoichiometric excess of water. The foams have molded densities less than or equal to 1.5 lb/ft3 and softness, as measured by 25% ILD of less than or equal to 15 lbs., yet retain excellent resiliency, tear strength and elongation. The foams are suitable for use in cushioning applications such as those traditionally employing polyester fiberfill.