Process for the production of flame-retardant polyurethane products

Claim 1

The process of preparing a flame retardant foamed polyurethane products which process comprises of mixing and reacting: (A) A salt-forming basic compound selected from the group consisting of alkali metal compounds selected from the group consisting of compounds containing sodium, potassium, lithium, rubidium, cesium and mixtures thereof, except for alkali metal sulfate compounds, alkali metal halide compounds and alkali metal, alkaline earth metal compounds selected form the group consisting of compounds containing calcium, magnesium, barium, strontium and mixtures thereof, except for alkaline earth metal sulfate, alkaline earth metal halides and alkaline earth metal nitrates, metal compounds selected from the group consisting of compounds containing beryllium, copper, zinc, aluminum, tin, titanium, zirconium, lead, arsenic, antimony, bismuth, molybdenum, tungsten, manganese, iron, nickel, cobalt and mixtures thereof, except for metal sulfates, and metal halide and metal nitrates, ammonia compounds selected form the group consisting of ammonia, ammonium carbonate, amino compounds, amines, ammonia salts of organic acid, quaternary ammonium hydroxides, ammonium silicate and mixtures thereof except for ammonium salts of sulfuric acid, nitric acid and acid halides and mixtures thereof in the amount of 1 to 300 parts by weight; (B) salt-forming acidic compounds selected from the group consisting of phosphorous-containing compounds, halogen-containing compounds, and mixtures thereof in the amount of 1 to 100 parts by weight; (C) compound containing one or more active hydrogen that will react with a polyisocyanate compound in the amount of 1 to 200 parts by weight; (D) compounds containing at least two isocyanate groups in the amount of 50 to 100 parts by weight, the said mixing will be carried out in such a way that components (A) and (B) are reacted in (C) or (D) or in both (C) and (D) before (C) and (D) are reacted, (E) up to 50 percent by weight of an inert liquid, boiling in the range of -25° C. to 80° C., is included in the reaction mixture as blowing agent and the reaction proceeds with concomitant foaming.