Importance

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Abstract

A cold pack 10 made in accordance with the principles of the present invention includes a container 18. Disposed within the container 18 is a first endotherm-producing chemical 15. Also disposed within the container 18 is a solvent packet 13 and a chemical packet 11. Second endotherm-producing chemical 43 is disposed in the chemical packet 11. First endotherm-producing chemical 15, the solvent packet 13 and the chemical packet 11 are collectively components of the cold pack. Preferably the container 18 is sealed so as to surround and encase the components of the cold pack 10. The first endotherm-producing chemical 15 and the second endotherm-producing chemical 43 are selected to be different. Both the first endotherm-producing chemical 15 and the second endotherm-producing chemical 43 may be selected from among those compounds with a positive enthalpy of solution (.DELTA..sub.sol /H.degree., kJ/mol) and which produce a reduced temperature of solution that is greater than 10.degree. F. and provide the cold pack 10 with an extended life.

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First Claim