Compositions – Fire retarding – For solid synthetic polymer and reactants thereof
Reexamination Certificate
2000-10-23
2002-10-15
Anthony, Joseph D. (Department: 1714)
Compositions
Fire retarding
For solid synthetic polymer and reactants thereof
C252S607000, C252S608000, C252S601000, C528S259000, C523S179000, C521S094000, C521S095000, C564S039000
Reexamination Certificate
active
06464903
ABSTRACT:
FIELD
This invention concerns nitrogen containing compound urea condensate salt of sulfur oxyacid as fire controlling agent. The invention also concerns the preparation and use of nitrogen containing compound urea condensate salt of sulfur oxyacid. The nitrogen containing compound urea condensate salt of sulfur oxyacid and/or its composition is useful to stop house fires, grass and forest fires, to produce flame retarded water based plastic, flame retarded plastics, flame retardant polyurethane foam, etc, and fire retardant flammable organic materials by spraying the outside with aqueous nitrogen containing compound urea condensate salt of sulfur oxyacid and/or its composition.
BACKGROUND
Urea in the form of a solid compound has been used as a flame retardant agent in polyurethane foams as outline in U.S. Pat. No. 4,385,131 (Fracalossi, et al.). Many patents use solid urea condensates, urea phosphates, urea borates and urea derivative as the flame retardant agent. The use of aqueous or powdered nitrogen containing compound urea condensate salt of sulfur oxyacid as the fire retardant compound is novel. When solid urea is used in sufficient amounts, as the flame retardant retardant compound in the production of flame retardant organic products, such as polyurethane products it leaves a slimy or soapy feel to the outer surface of the urethane products, which is very undesirable. The urea migrates out and the product becomes less fire retardant. When the powdered or aqueous nitrogen containing compound urea condensate salt of sulfur oxyacid is utilized, it reacts with the polyisocyanate and becomes a part of the product. There is no slimy or soapy feel to this foam. Aqueous ammonium urea condensate salt of sulfur oxyacid may be used as a fertilizer and is very environmentally safe product to use on grass and forest fires. When used for fire fighting the aqueous ammonium urea condensate salt of sulfur oxyacid may contain coloring agents such as iron oxide, thickening agents, gelling agents, corrosive inhibitors, bactericide agents, surfactant and wetting agents. Aqueous ammonium urea condensate salt of sulfur oxyacid is more economical to use to fight fires than the commonly used fire fighting chemicals such as various ammonium phosphates and ammonium sulfate.
What is lacking and what is needed are useful, safe and inexpensive flame retardant compounds found in aqueous or powdered nitrogen containing compound urea condensate salt of sulfur oxyacid. What is additionally lacking are compositions have aqueous or powdered nitrogen containing compound urea condensate salt of sulfur oxyacid employed therein.
SUMMARY
In one aspect, the invention comprises the fire retardant aqueous or powdered nitrogen containing compound urea condensate salt of sulfur oxyacid. Another aspect of the invention is a process to prepare the aqueous or solid nitrogen containing compound urea condensate salt of sulfur oxyacid composition.
Another aspect of this invention is the process to prepare an aqueous or solid nitrogen containing compound urea condensate salt of sulfur oxyacid or composition by mixing:
(A) urea, in the amount of 25 to 200 parts by weight;
(B) nitrogen containing compound that will react with sulfur oxyacid or urea, in the amount of 1 to 200 parts by weight;
(C) sulfur oxyacid and/or it's salts, in the amount of 5 to 50 parts by weight;
(D) carbonization auxiliaries, in the amount of 0 to 300 parts by weight;
(E) metal containing compound that will accelerate the carbonization process, in the amount of 0 to 30 parts by weight;
(F) heat reflecting compound, in the amount of 0 to 30 parts by weight;
(G) filler, in the amount of 0 to 300 parts by weight;
(H) surfactant, in the amount of 0 to 30 parts by weight;
(I) water, in the amount of 0 to 500 parts by weight.
Another aspect of this invention is to apply on and/or incorporating in a more flammable organic material (Component J) the flame retardant compounds, aqueous or sold nitrogen containing compound urea condensate salt of sulfur acid and/or composition.
Another aspect of this invention is to utilize the aqueous nitrogen containing compound urea condensate salt of sulfur oxyacid and/or the aqueous nitrogen containing compound urea condensate acid salt of sulfur oxyacid composition to fight fires such as grass fires, forest fires, house fires, furniture fires, etc. In fighting grass fires a water diluted solution of aqueous nitrogen containing compound urea condensate salt of sulfur oxyacid and/or aqueous nitrogen containing compound urea condensate salt of sulfur oxyacid composition, preferable ammonium urea condensate salt of sulfur oxyacid, with or without, surfactant, to produce bubbles, may be sprayed directly on the flames or may be sprayed in front of the flames thereby wetting the organic materials in front of the fire. The aqueous ammonium urea condensate salt of sulfur oxyacid and/or aqueous ammonium urea condensate salt of sulfur oxyacid composition, even after drying, and for several day afterwards, will prevent the coated organic materials such as grass, leaves and bushes from catching on fire when exposed to flames. Some of the ammonium urea condensate salt of sulfur oxyacid is absorbed by the grasses, leave, limbs, fir needles, etc. thereby making dry plants flame retardant.
Component A
Any suitable aqueous urea or solid urea may be utilized in this invention. The aqueous urea produced in the manufacturing process of producing urea and/or the aqueous urea produced by adding solid urea to water. Usually the aqueous solution of urea contains 50% or less of urea. Solid urea is preferred in the amount of 25 to 200 parts by weight. Urea condensate may also be used.
Component B
Any suitable nitrogen containing compounds that will react with a sulfur oxyacid compound or urea may be used in this invention. Aqueous and/or gaseous salt forming nitrogen compounds may be use, such as gaseous ammonia. Any suitable nitrogen containing compound, especially those containing reactive —NH
2
, —COOH, —OH, —NCO, and/or epoxide radical, that will react with sulfur oxyacids and/or isocyanic acid and/or cyanic acid which is produced by heating urea may be utilized in this invention. The nitrogen containing compound may be an organic or an inorganic compound. Suitable organic nitrogen containing compounds may be an aliphatic, aromatic, cyclic, aliphatic-aromatic or aliphatic-cyclic compound such as, but not limited to, urea, urea derivatives for example, O-alkylureas, amino compounds, for example, melamine, melamine cyanurate, dicyandiamide, biuret, biuret-metal complex, cyanuric acid, cyamelide, guanidine, cyanoguanidine and aminoguanidine, ammonium carbonate, alkyl carbamates, alkyl isocyanates, polyisocyanates, sulfamic acid, ammonium sulfamate, amines, polyamines, thioureas, alkylanolamine, polyamides with free NH
2
— radicals, amidines, amides, aldimines, ketimines, guanidine carbonate, amino carbonates, aminoborates, amino sulfates, thiourea, thiourea derivatives, compounds with active NH
2
— radicals, such as amino phosphate, amino salts of organic phosphorus compounds and amino condensation salt of inorganic and organic phosphorus compounds containing active NH
2
— radicals and mixtures thereof. The amino compounds and ammonia are the preferred nitrogen containing compound. The nitrogen containing compound may be utilized in the amount of 1 to 200 parts by weight. Aqueous ammonia is preferred. Ammonia may be utilized in the amount necessary to adjust the pH to the desired pH. Ammonia is also produced by the condensation of urea when heated.
Component C
Any suitable sulfur oxyacid or it's salts that will react with urea may be used, such as sulfurous acid, sulfuric acid, pyrosulfuric acid, ammonium sulfate, ammonium hydrogen sulfate, ammonium sulfite, ammonium thiosulfate, urea hydrogen sulfate, urea sulfate, melamine hydrogen sulfate, amino hydrogen sulfates, biuret sulfate, lignin sulfate, lignin sulfite, amine hydrogen sulfates, polyamine hydrogen sulfates, metal hydrogen sulfates, alkyl hydrogen sulfates, aryl hydrogen sulf
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