Abstract: The incorporation of a poly(siloxane-glycol) surfactant having a cloud point ranging from 25.degree.-50.degree. C. into a water-based mold release composition comprising an aqueous emulsion or dispersion of at least one release effective substance and desirably at least one emulsifying agent provides for improved surface quality of the foam product.Also disclosed is a method for preparing a polyurethane foam article in a mold by applying to a mold surface a water-based mold release composition which comprises a release effective system which is in a solid (hardened) state at the mold pour temperature and a liquid state at the demold temperature, pouring a polyurethane foam composition into the mold, curing the foam composition and demolding the foam article. The use of such release effective system in the aqueous mold release composition provides for a reduction in surface defects of the polyurethane foam article.

Abstract: An aqueous mold release agent for the production of molded polyurethane articles, especially polyurethane soft foam articles, is provided which contains as substance effecting mold release at least a portion of one or more unsaturated oligomeric or polymeric hydrocarbons having molecular weights of at least 500 and iodine values of at least 60, preferably in combination with one or more foam stabilizers suited for polyurethane systems.