METHOD OF MAKING FOAMS AND FOAMABLE COMPOSITIONS

摘要

Foam compositions are disclosed with a synergistic blowing agent mixture of propane and butane for use as coatings and adhesives. Foams are made by pressurizing a liquid composition containing a blowing agent mixture of propane and butane and releasing the pressure to form the foams. The propane and butane are contained in a liquid composition in relative amounts which together provide a synergistic foaming effectiveness upon the liquid composition. High foam-volume ratios are achieved at relatively low pressures employing the liquid blowing agent mixture of propane and butane. The method and compositions are advantageous in making paints and adhesives with polymeric components as the film-forming or adhesive solids.