Self-steaming compositions, articles comprising such compositions and methods of preparing such compositions
View Patent ↗Disclosed herein are compositions which are exothermic upon contact with oxygen and are self-steaming. The various described embodiments include compositions comprising: (a) a fuel component; (b) a water manager component; and (c) water. In one embodiment, the water manager component, has a mean particle size distribution of greater than about 250 microns. Alternatively or additionally, the ratio of the water manager component to the water is from about 0.001:1 to about 0.2:1, by weight. Alternatively or additionally, the fuel component comprises sponge iron. Alternatively or additionally, the composition comprises a volatile component. In yet another embodiment, articles comprising the compositions are described. Further, methods of making the compositions are described.
1. An article comprising a plurality of heat cells, wherein the heat cells comprise a composition containing: (a) a fuel component having; (b) a water manager component comprising absorbent gelling material, wherein the mean particle size distribution of the water manager component is greater than about 250 microns; (c) water wherein the water is physically or chemically held to the water manager; and (d) pre-wetted carbon; wherein the composition is exothermic upon contact with oxygen and is self-steaming upon contact with oxygen; and wherein the article generates at least 2×10 −5 g/minute of steam.
2. The article according to claim 1 wherein the fuel component comprises a material selected from the group consisting of metals, metal salts, carbon, and mixtures thereof.
3. The article according to claim 1 wherein the mean particle size distribution of the water manager component is at least about 400 microns.
4. The article according to claim 1 wherein the fuel component comprises iron, a metal salt, and pre-wetted activated carbon.
5. The article according to claim 4 wherein the mean particle size distribution of the fuel component is at least about 100 microns.
6. The article according to claim 5 comprising from about 0.1% to about 30% of the water manager component, by weight of the composition.
7. The article according to claim 6 comprising from about 30% to about 95% of the iron, from about 0.5% to about 10% of the metal salt, from about 0.5% to about 25% of the pre-wetted activated carbon, and from about 1% to about 60% of the water, all by weight of the composition.
8. The article composition according to claim 7 wherein the wherein the mean particle size distribution of the water manager component is from about 400 microns to about 800 microns and wherein the wherein the mean particle size distribution of the fuel component is from about 100 microns to about 300 microns.
9. An article comprising a plurality of heat cells, wherein the heat cells comprise a composition containing: (a) a fuel component; (b) a water manager component comprising absorbent gelling material; (c) water wherein the water is physically or chemically held to the water manager, and (d) pre-wetted carbon; and wherein the ratio of the water manager component to the water is from about 0.001:1 to about 0.2:1, by weight, wherein the composition is exothermic upon contact with oxygen and is self-steaming upon contact with oxygen; and wherein the article generates at least 2×10 −5 g/minute of steam.
10. The article according to claim 9 wherein the ratio of the water manager component to the water is from about 0.01:1 to about 0.17:1, by weight.
11. The article according to claim 10 wherein the fuel component comprises a material selected from the group consisting of metals, metal salts, carbon, and mixtures thereof.
12. The article according to claim 9 wherein the fuel component comprises iron, a metal salt, and pre-wetted activated carbon.
13. The article according to claim 12 comprising from about 0.1% to about 30% of the water manager component, by weight of the composition.
14. The article according to claim 13 comprising from about 30% to about 95% of the iron, from about 0.5% to about 10% of the metal salt, from about 0.5% to about 25% of the pre-wetted activated carbon, all by weight of the composition.
15. The article according to claim 14 wherein the ratio of the water manager component to the water is from about 0.05:1 to about 0.12:1, by weight.
16. An article comprising a plurality of heat cells, wherein the heat cells comprise a composition containing: (a) a fuel component comprising sponge iron; (b) a water manager component comprising absorbent gelling material; (c) water wherein the water is physically or chemically held to the water manager, and (d) pre-wetted carbon; and wherein the composition is exothermic upon contact with oxygen and is self-steaming upon contact with oxygen; and wherein the article generates at least 2×10 −5 g/minute of steam.
17. The article according to claim 16 wherein the fuel component further comprises a material selected from the group consisting of metal salts, carbon, and mixtures thereof.
18. The article according to claim 16 wherein the fuel component comprises a metal salt and pre-wetted activated carbon.
19. The article according to claim 18 comprising from about 0.1% to about 30% of the water manager component, by weight of the composition.
20. The article according to claim 19 comprising from about 30% to about 95% of the sponge iron, from about 0.5% to about 10% of the metal salt, from about 0.5% to about 25% of the pre-wetted activated carbon, and from about 1% to about 60% of the water, all by weight of the composition.
21. The article according to claim 1 comprising an enclosure which contains the composition, wherein the enclosure is impermeable to air.
22. The article according to claim 9 comprising an enclosure which contains the composition, wherein the enclosure is impermeable to air.
23. The article according to claim 16 comprising an enclosure which contains the composition, wherein the enclosure is impermeable to air.
24. The article according to claim 1 comprising: (a) a thermal pack, wherein the thermal pack comprises a material which is permeable to air.
25. The article according to claim 24 , wherein the thermal pack further comprises a material which is impermeable to air.
26. The article according to claim 25 wherein the material which is permeable to air is selected from the group consisting of woven fabrics, knit fabrics, nonwovens, and combinations thereof and wherein the material which is impermeable to air is selected from the group consisting of polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, saponified ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, natural rubber, reclaimed rubber, synthetic rubber, and mixtures thereof.
27. The article according to claim 9 comprising: (a) a thermal pack, wherein the thermal pack comprises a material which is permeable to air.
28. The article according to claim 27 , wherein the thermal pack further comprises a material which is impermeable to air.
29. The article according to claim 28 wherein the material which is permeable to air is selected from the group consisting of woven fabrics, knit fabrics, nonwovens, and combinations thereof and wherein the material which is impermeable to air is selected from the group consisting of polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, saponified ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, natural rubber, reclaimed rubber, synthetic rubber, and mixtures thereof.
30. The article according to claim 16 comprising: (a) a thermal pack, wherein the thermal pack comprises a material which is permeable to air.
31. The article according to claim 30 which is a vaporizer.
32. An article comprising a plurality of heat cells, wherein the heat cells comprise a composition containing: (a) a fuel component; (b) a water manager component comprising absorbent gelling material; (c) water wherein the water is physically or chemically held to the absorbent gelling material; and (d) pre-wetted carbon, and (e) a material having an oxygen permeability of at least about 10 ft.sup.3/cm wherein the article is self-steaming upon contact with oxygen; and wherein the article generates at least 2×10 −5 g/minute of steam.
33. The article according to claim 32 wherein the material has an oxygen permeability of at least about 20 ft.sup.3/cm.
34. The article according to claim 33 wherein the material has an oxygen permeability of from about 20 ft.sup.3/min to about 150 ft.sup.3/min.
35. The article according to claim 34 wherein the material is selected from the group consisting of woven fabrics, knit fabrics, nonwovens, and combinations thereof and further including a second material impermeable to air selected from the group consisting of polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, saponified ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, natural rubber, reclaimed rubber, synthetic rubber, and mixtures thereof.