Thermal storage medium composition and thermal storage medium
Provided is a thermal storage medium composition which contains 100 parts by mass of a hydrogenated diene copolymer and 50 to 4000 parts by mass of a linear paraffin compound having 12 to 50 carbon atoms, where the hydrogenated diene copolymer is a conjugated diene copolymer that is obtained by hydrogenating a block copolymer which includes a polymer block (A) that contains structural units (a-1) derived from a first conjugated diene compound and has a vinyl bond content of not more than 20 mol %, and a polymer block (B) that contains structural units (b-1) 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%.
1. 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 paraffin 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 (a-1) derived from a first conjugated diene compound and has a vinyl bond content of not more than 20 mol %, and a polymer block (B) that contains structural units (b-1) 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%.
2. The thermal storage medium composition according to claim 1 , wherein the mass ratio of the polymer block (A) to the polymer block (B) ((A)/(B)) in the block copolymer is 5/95 to 50/50.
3. The thermal storage medium composition according to claim 1 or 2 , wherein the block copolymer further includes structural units derived from an alkenyl aromatic compound at a content of not more than 30% by mass with respect to the block copolymer.
4. The thermal storage medium composition according to claims 1 or 2 , wherein the structural units (a-1) in the polymer block (A) include 95 to 100% by mass of 1,3-butadiene-derived structural units.
5. The thermal storage medium composition according to claims 1 or 2 , wherein the paraffin compound shows a melting peak at 0 to 70° C. according to differential scanning calorimetry (DSC).
6. The thermal storage medium composition according to claims 1 or 2 , further comprising a filler.
7. A thermal storage medium which is obtained by packing the thermal storage medium composition described in claims 1 or 2 into a packaging material.
8. The thermal storage medium according to claim 7 , wherein the packaging material is a laminate film comprising a heat seal layer as an innermost layer and a layer made of a polar resin with oil resistance.
9. The thermal storage medium composition according to claim 1 or 2 wherein the linear paraffin compound has 16 to 50 carbon atoms.