Process of producing cross-linked open-celled polyurethane foam

Abstract From the Canadian patent

In the disclosed process of producing resilient open-celled, cross-linked polyurethane foams by foaming polyol, polyisocyanate, catalyst and blowing agent the foaming is, effected in the presence of a cross-linker which is a saturated or unsaturated, aliphatic, cycloaliphatic hetero-, aliphatic or arylaliphatic crystalline polyhydroxy compound having at least 3 hydroxy groups. The crystalline polyhydroxy compound is insoluble or only slightly soluble in the polyol to be foamed and melts within the temperature range of about 60-160°-C. The amount of crystalline polyhydroxy compound to be used corresponds to about 0.1-5.0 hydroxy equivalent weights per 1 hydroxy equivalent weight of the …