PURPOSE: To obtain a low-cost bagged material for cooling, which retains its cooling power over a long period of time and can be reused repeatedly, by combining an inner bag containing an aqueous material with an outer bag containing a cooling agent and a water-absorptive resin comprising a specified mixture.
CONSTITUTION: This bagged material for cooling consists of an inner bag containing an aqueous material and an outer bag containing a cooling agent and a water- absorptive resin comprising a mixture of an acrylic acid/vinyl alcohol copolymer with a sodium acrylate polymer. As the aqueous material, an ordinary water, e.g., tap water or well water, or a purified water, e.g., distilled water is mainly used. The ratio of the cooling agent to the aqueous material has a great influence on the time during which the cooling power is retained. If the amount of the aqueous material is excessive in relation to the cooling agent, the cooling agent is dissolved at once to cool so that the temperature of the solution is lowered rapidly; however, the cooling power will not be retained for a long time since no subsequent reaction occurs. If the water content is extremely high, a drop in the temperature due to heat absorption will be small because of the large heat capacity of the aqueous material.
| JP2012077916 | COOLING PACK |
| WO/2001/065187 | PORTABLE HEATING/COOLING AND DISPENSING DEVICES |
ONO KATSUYA
ISHIZAKI TETSUO
KOSHIMIZU FUMIHIKO
