PURPOSE:To produce a novel cold-keeping thermal medium having ready handleability, physical and chemical stability and high thermal medium efficiency and useful in medical, domestic and industrial fields, etc., by adding vegetable gum and urea to granules of highly water-absorbing polymer, dissolving the mixture in water and packaging the solution in a vessel. CONSTITUTION:(A) 1pt.wt. of a highly water-absorbing polymer such as starch- acrylonitrile polymer is compounded with (B) 1-1.5pts. of a vegetable gum such as traganth gum and (C) 0.2-2pts. of urea and the mixture is slowly dissolved in water of a volume of less than the saturated water content and 100-500 times volume of the component A. The objective thermal medium can be produced by packaging the solution in a vessel having a specific shape. The material quickly reaches the minimum temperature and keeps the temperature over a long period.
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