HYDRATED GEL COMPOSITION FOR COLD-INSULATING AGENT AND COLD-INSULATING AGENT CONTAINING THE HYDRATED GEL COMPOSITION

摘要

PURPOSE:To obtain the subject composition having a freezing point in a low temperature range, excellent softness and long cold-insulating time by using a water-absorbing resin, water, a water-soluble compound having freezing point- depressing action and a hydrophilic organic solvent having a freezing point in a specific low temperature range as essential components. CONSTITUTION:The objective composition having a freezing point of =0 deg.C is composed of (A) a water-absorbing resin such as crosslinked (meth)acrylic acid salt polymer, (B) water, (C) a water-soluble compound having freezing point-depressing action and preferably consisting of an inorganic salt of a univalent cation such as nitric acid and/or urea and (D) a hydrophilic organic solvent having a freezing point of =0 deg.C (preferably propylene glycol). The preferable compounding ratios of the components B, C and D are 60-90wt.%, 5-20wt.% and 10-20wt.%, respectively. The amount of the component A is 5-30 pts.wt. based on 100 pts.wt. of B+C+D.