摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method of producing a polycarbonate diol which reduces formation of by-products, e.g. tetrahydrofuran, and improves the polymerization reaction rate and is excellent in industrial productivity.SOLUTION: A method of producing a polycarbonate diol is for producing a polycarbonate diol which contains at least a structural unit (A) originated from a compound of formula (A) and optionally a structural unit (B) originated from a compound of formula (B). When the polycarbonate diol contains the structural unit (A) and the structural unit (B), a compound of formula (B) used as a raw material has an acid value of 0.01-8.00 mgKOH/g. When the polycarbonate diol contains the structural unit (A) in a ratio equal to or higher than a specified ratio, the compound of formula (A) has an acid value of 0.03-8.00 mgKOH/g. Formula (A) HO-(CH)-OH; and formula (B) HO-R-OH, where Ris a 3-20C hydrocarbon group other than tetramethylene group.</p> |