POLYCARBONATE DIOL AND POLYURETHANE USING SAME

摘要

The present invention relates to a polycarbonate diol comprising a structural unit derived from a compound represented by the following formula (A) and a structural unit derived from a compound represented by the following formula (B), wherein the hydroxyl value is from 20 to 450 mg-KOH/g:
[Chem. 1]
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO-R 1 -OH€ƒ€ƒ€ƒ€ƒ€ƒ(A)
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO-R 2 -OH€ƒ€ƒ€ƒ€ƒ€ƒ(B)
the glass transition temperature of said polycarbonate diol as measured by a differential operating calorimeter is -30°C or less and the average carbon number of a dihydroxy compound obtained by hydrolyzing said polycarbonate diol is from 3 to 5.5.