| 摘要 |
A polycarbonate diol comprising repeating units represented by the following formula and having terminal hydroxy groups. It is characterized in that 60-100 mol% of the repeating units represented by the formula are repeating units represented by the following formula or , the amount of the repeating units represented by the formula is 10-50 mol%, excluding 50 mol%, based on the total amount of the repeating units represented by the formula, and the polycarbonate diol has a terminal primary OH proportion of 95-98.5%. (In the formula, R represents a Cdivalent aliphatic or alicyclic hydrocarbon)
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