| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition that does not undergo a phase separation even if a heat cycle of melting-solidification is repeated over a long period of time by mixing a sodium sulfate decahydrate or its eutectic with a hydrophilic fumed silica and a hydrophilic fumed alumina or a hydrophilic smectite. SOLUTION: In the case where the composition contains a fumed silica (B) and a fumed alumina (C) as a phase separation inhibitor, it is preferable that a weight ratio of B:C of 95:5-70:30 and that the total content of the component B and the component C is 5-30 pts.wt. per 100 pts.wt. sodium sulfate decahydrate or its eutectic (A). It is preferable that the component B and the component C have an average particle size of not more than 0.1μm. In the case where the composition contains the component B and smectite (D) as a phase separation inhibitor, it is preferable that a weight ratio of B:D is 10:90-90:10 and that the total content of the component B and the component D is 5-40 pts.wt. per 100 pts.wt. the component A.
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