| abstract |
Provided is a polycarbonate polyol which is a raw material of polyurethane having good storage stability of a polyurethane solution and excellent flexibility and solvent resistance. As a polycarbonate diol containing the structural unit represented by following formula (A) and the structural unit represented by following formula (B), provided that R < 1> , R < 2> is a C1-C4 alkyl group each independently, In the range, an oxygen atom, a sulfur atom, a nitrogen atom, a halogen atom, or a substituent containing these atoms may be used, and R 3 represents a linear aliphatic hydrocarbon having 3 or 4 carbon atoms.) The 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 Part in Polymer) / (Content of Carbonate Group in Polymer) × 100 (%) ‥‥ (I) |