Polycarbonate polyol and polyurethane

A polyurethane, obtainable by reacting a polycarbonate polyol with a compound comprising isocyanate groups, wherein

• the polycarbonate polyol comprises structural units derived from a polyhydric alcohol and has a hydroxyl value of 20 mg KOH/g to 450 mg KOH/g,
• the polycarbonate polyol is produced by a transesterification reaction of the polyhydric alcohol with a carbonate compound,
• the polyhydric alcohol comprises a diol (A) and a trihydric to hexahydric branched alcohol (B), comprising a partial structure (B2) represented by the following Formula (B2), having 4 to 12 carbon atoms,
• the diol (A1) comprises an oxyalkylene glycol (A1) represented by the following Formula (A1) and a content ratio of the oxyalkylene glycol (A1) in the diol (A) is 70% by weight or higher,
• a ratio of structural units derived from the branched alcohol (B) in the polycarbonate polyol is 0.005% by mole to 5.0% by mole, the ratio being with respect to a total amount of the structural units derived from the polyhydric alcohol in the polycarbonate polyol, and
• a ratio of a structural unit (X2) represented by the following Formula (X2) in the structural units derived from the branched alcohol (B) is not higher than 50% by mole based on the total moles of structural units derived from the branched alcohol (B:
• wherein, in represents an integer of 2 to 4;
• RA1 represents a carbon chain optionally containing a branch having 2 to 5 carbon atoms;
• and in RA1s contained in Formula (A1) are the same or different