| abstract |
A polymer that can give a heat storage material excellent in moisture permeability and shape retention after phase transition and has excellent moldability, that is, a structural unit derived from ethylene (A) and a structure represented by a specific formula The unit (B) may have a structural unit (C) represented by a specific formula, and the total number of the unit (A), the unit (B), and the unit (C) may be 100. %, The number of the units (A) is 70% or more and 99% or less, the total number of the units (B) and the units (C) is 1% or more and 30% or less, and the units (B) Provided is a polymer in which the total number of units (C) is 100%, the number of units (B) is 1% or more and 100% or less, and the number of units (C) is 0% or more and 99% or less. Is done. |