On-site generation of polyurethane foam using an HCFC as a sole blowing agent

A process for producing, by means of a portable foaming apparatus having a static mixer, a polyurethane foam comprising reacting a reaction mixture comprised of a polyol, an organic isocyanate, a foaming/frothing agent, and a reaction catalyst, said reaction mixture being reacted in said portable foaming apparatus comprised of

• a) a first supply tank for supplying isocyanate reactant,
• b) a second supply tank for supplying other polyurethane foam forming reactants,
• c) a nitrogen pressure tank having a valved outlet in communication with inlets to the first and second supply tanks,
• d) a static mixer having one outlet and two inlets communicating via conduits with outlets on the first and second supply tanks, and
• e) adjustable flow control units interposed in the conduits linking the supply tanks with the static mixer,
• wherein monochlorodifluoromethane is used as the sole foaming/frothing agent in said reaction mixture, said polyol comprises a polyether polyol having an average of between four and eight active hydrogens per molecule and a hydroxyl number ranging from about 300 to about 700, with the proviso that said polyether polyol contains no polyoxyalkylated glycerine having an OH number of from about 200 to about 300, in order to produce an essentially closed-cell rigid or semi-rigid polyurethane foam.