| abstract |
Provided is a polycarbonate polyol that has good storage stability of a polyurethane solution and is a raw material for polyurethane excellent in flexibility and solvent resistance. A polycarbonate diol comprising a structural unit represented by the following formula (A) and a structural unit represented by the following formula (B), wherein R 1 and R 2 are each independently an alkyl group having 1 to 4 carbon atoms, Within the range, it may have an oxygen atom, a sulfur atom, a nitrogen atom, or a halogen atom, or a substituent containing these atoms, and R 3 represents a linear aliphatic hydrocarbon having 3 or 4 carbon atoms.) Polycarbonate diol Polycarbonate diol whose molecular weight is 500-5000 and the value of following formula (I) is 0.3 or more and 20.0 or less. (Content of branched chain moiety in polymer) / (Content of carbonate group in polymer) x 100 (%) ... (I) |