| 摘要 |
PROBLEM TO BE SOLVED: To obtain a regenerating agent, a regenerating pack and a cooling box, having a long cold storage duration, suitable for cold insulation transportation for a long time, cold insulation storage, cold insulation exhibition, etc. SOLUTION: This regenerating agent is obtained by mixing an aqueous solution of a metal salt such as sodium chloride, etc., with a nonionic polymer containing a group having affinity by interaction with a water molecule but not an ionic group to be subjected to ionic bond with a metal ion in the aqueous solution, namely a poly.N-vinylacetamide as a cold storage duration prolonging agent. |
