PROBLEM TO BE SOLVED: To provide a constant temperature refrigerant agent including sodium sulfate excellent in continuity of cooling effect, repeatedly usable, exhibiting good shape retention after being used for a long time, having no problem of crystal growing after repeated use, and excellent in coldness effect in initial contact.SOLUTION: A constant temperature refrigerant agent contains sodium sulfate, smectite, water, and a gelling agent. The smectite is bentonite.COPYRIGHT: (C)2013,JPO&INPIT【課題】冷却効果の持続性に優れ、繰り返し利用可能であって、長時間使用後の保形性が良く、繰り返し使用後の結晶成長の問題もなく、さらに初期接触時の冷感作用にも優れた芒硝を含有する恒温冷媒剤が提供される。【解決手段】芒硝、スメクタイト、水、及びゲル化剤を恒温冷媒剤に含有させる。【選択図】なし
