Abstract: A trigger capable of causing crystallization of regenerative substances. A regenerative body includes the trigger which includes a plurality of secured elastic flat elements and the regenerative substances, when in a supercooled state, receive a physical stimulus from the trigger.

Abstract: A cooling agent which cools by an endothermic reaction resulting from the dissolving of crystals of inorganic salts water, the salts crystallizing at about room temperature by supplying heat. The cooling agent comprises a mixture of (i) a sodium phosphate salt, (ii) a sodium ammonium phosphate salt or an ammonium phosphate salt, and (iii) water. The cooling agent is produced in a manner which avoids the conglomeration of the crystals, which was a difficulty in the art. Moreover, the cooling agent of the present invention can be used repeatedly. When a nucleating agent, a highly water absorbent polymer or a thickener is added to the cooling agent, the precipitation of the crystals occurs in a still finer and stabler state. The cooling agent can be used in a cooling pillow having a desirable cooling property and a soft and agreeable touch, which offers comfort with safety and which is free from conglomeration of crystals, even after a long period of time.

Abstract: A refrigerant containing two or more constituent components that exhibit an endothermic action when mixed with each other, the refrigerant including, as the constituent components, an inorganic salt and a salt hydrate containing at least a hydrate of strontium hydroxide. The refrigerant has a superior cooling capability such as a low attainable cooling temperature and a long duration of the cooled state, and also has no fear of melting or deterioration even where the atmospheric temperature is increased during storage.