Refrigeration – Chemical reaction or solids dissolving
Patent
1976-12-03
1978-03-28
Bernstein, Hiram H.
Refrigeration
Chemical reaction or solids dissolving
252 70, F25D 502
Patent
active
040812561
ABSTRACT:
A particulate composition producing an endothermic reaction when mixed with water, and a cold pack containing such a composition, and water isolated therefrom until the intended time of use. The composition consists essentially of, in parts by weight, about 65 to about 130 parts urea, about 35 to about 80 parts hydrated sodium acetate (Na C.sub.2 H.sub.3 O.sub.2 .multidot.3H.sub.2 O), about 18 to about 40 parts potassium chloride, potassium nitrate, or mixtures thereof, about 18 to about 30 parts ammonium chloride, and about 6 to about 10 parts quar gum. A cold pack comprises an outer sealed, flexible, impermeable enclosure containing the composition, and an inner sealed, flexible, impermeable, easily ruptured enclosure containing about 85 to about 140 parts by weight water. The pack reaches and maintains a temperature of about -7.degree. C for up to 30 minutes, and is moldable to conform to the surfaces being cooled.
REFERENCES:
patent: 1894775 (1933-01-01), Levenson
patent: 2800454 (1957-07-01), Shepherd
patent: 3058313 (1962-10-01), Robbins
patent: 3191392 (1965-06-01), Donnelly
patent: 3903011 (1975-09-01), Donnelly
patent: 3950158 (1976-04-01), Gossett
patent: 3957472 (1976-05-01), Donnelly
patent: 4000996 (1977-01-01), Jordan
Bernstein Hiram H.
Bloom Jerome P.
Readi Temp Inc.
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