Exothermic composition and hot pack

Stoves and furnaces – Heaters – Chemical

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Details

44 3A, 206219, 252 70, 2521883R, F24J 102

Patent

active

040673138

ABSTRACT:
A particulate composition producing an exothermic reaction when mixed with water, and a hot pack containing such a composition, and water isolated therefrom until the intended time for use. The composition consists essentially of, in parts by weight, about 40 to about 90 parts anhydrous calcium chloride, about 12 to about 25 parts anhydrous sodium acetate, and about 5 to 15 parts calcium oxide. A hot pack, per the invention, comprises a sealed, impermeable, flexible outer enclosure containing the composition, and a sealed, impermeable, flexible, easily ruptured inner enclosure containing about 40 to about 90 parts by weight of water. The proportions of the elements of the particulate composition will vary somewhat in accordance with the objectives of the hot pack in which the composition is applied. When the contents of the hot pack are activated, it will gradually reach, maintain and be limited to be predetermined safe temperature. For example, in an embodiment particularly advantageous for use as a food warmer, this predetermined temperature will be about 107.degree. C and will be maintained for a period of time up to 20 minutes. An embodiment applied as a food and hand warmer will, by contrast, gradually reach and maintain a temperature of about 84.degree. C for a period up to 20 minutes and more. In any case the hot pack, when its contents are activated, will be placed in a condition that it is moldable to conform to the surface or surfaces to which it is applied.
The pack of the subject invention also features, in preferred embodiment, an improved construction for the inner enclosure designed to give highly controlled conditions and insurance as to the time the inner enclosure will rupture.

REFERENCES:
patent: 2261221 (1941-11-01), Bruner
patent: 2680063 (1954-06-01), Shapiro
patent: 3328136 (1967-06-01), Yerakas
patent: 3461073 (1969-08-01), Crowell et al.
patent: 3475239 (1969-10-01), Fearon et al.
patent: 3702302 (1972-11-01), Wilson
patent: 3766079 (1973-10-01), Jackman
patent: 3903011 (1975-09-01), Donnelly
patent: 3951127 (1976-04-01), Watson et al.

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