Incorporation of a gaseous blowing agent into a liquid resin

Abstract From the Canadian patent

In the manufacture of insulating and lightweight construction materials, which can contain fillers, and which were produced by physical foaming; the addition of fillers has involved difficulties. This arises because materials having relatively rough surfaces as with most fillers, accelerate the collapse of liquid foams so greatly that the addition of, fillers was a problem in the case of physically foamed resins. The process of this invention increases the stability of reaction resin foams and condensation resin foams, so that the foam can be mixed with curing agents and accelerators, as well as lightweight fillers and if appropriate, heavier, fillers. The process involves contacting a thin …