COMPOSITION FOR HEAT-STORAGE MATERIAL  AND HEAT-STORAGE MATERIAL

Abstract COMPOSITION FOR HEATSTORAGE MATERIAL, AND HEATSTORAGE MATERIAL The present invention relates to a thermal storage medium composition which comprises 100 parts by mass of a hydrogenated diene copolymer and 50 to 4000 parts by mass of a linear parafn compound having 12 to 50 carbon atoms, the hydrogenated diene copolymer being a conjugated diene copolymer that is obtained by hydrogenating a block copolymer which includes a polymer block (A) that contains structural units (a1) derived from a rst conjugated diene compound and has a vinyl bond content of not more than 20 mol, and a polymer blocl (B) that contains structural units (bl) derived from a second conjugated diene compound and has a vinyl bond content of 30 to 95 mol, the hydrogenation ratio with respect to the double bonds derived from the conjugated diene compounds being not less than 90.