| 摘要 |
PURPOSE: To obtain a heat storage unit capable of uniformly carrying out the mixing and kneading without any unevenness and providing a heat storage unit hardly causing the exudation by converting a specific organic heat storage material into a molten state, then adding a polyolefin thereto and mixing and kneading the resultant mixture. CONSTITUTION: (A) An organic heat storage material (preferably a crystalline hydrocarbon, etc.) capable of reversibly carrying out the phase transition between a solid and a liquid phases is converted into a molten state and then mixed and kneaded with (B) plural polyolefins having different viscosities, preferably (i) a low-melt viscosity polyolefin in a molten state. (ii) A high-melt viscosity polyolefin is then added thereto and the components in a molten state are mixed and kneaded to afford the objective heat storage unit. Furthermore, the component (i) is preferably a polypropylene such as atactic polypropylene having <=40% crystallinity and the component (ii) is preferably any one of a high-density polyethylene, a low-density polyethylene and a straight-chain low-density polyethylene. |
