| 摘要 |
PURPOSE:To reduce the deterioration of the heat storing characteristics accompanying the repeated use, by dissolving a small amt. of a particular maleic acid copolymer in a heat storing material compsn. based on a hydrate or its eutectic mixture and having a transition temp. of 10-100 deg.C in terms of temp. at which the compsn. changes into an anhydride or a hydrate having a low degree of hydration. CONSTITUTION:A heat storing material compsn. comprised of a heat storing material compsn. based on a hydrate or its eutectic mixture and having a transition temp. of 10-100 deg.C in terms of temp. at which the compsn. changes into an anhydride or a hydrate having a low degree of hydration and 0.1-5.0wt% water-soluble copolymer of acrylic acid, methacrylic acid and/or styrene and maleic acid or a water-soluble salt thereof dissolved and contained therein. It is preferred that the maleic acid copolymer have a degree of copolymerization of the acrylic acid, methacrylic acid and/or styrene (component A) with maleic acid (component B) of about 100/50-100/300 in terms of an A to B molar ratio and a molecular weight of about 1,000-50,000. A preferable water-soluble salt of the maleic acid copolymer is an alkali metal salt, an ammonium salt, or an alkanolamine salt. |
