Polycarbonate polyol composition

A polycarbonate polyol composition comprising an unmodified polycarbonate polyol having a carbonate structure represented by the following formula (A), and a modified polycarbonate polyol having a carbonate structure represented by the following formula (A) and a urethane structure represented by the following formula (B), wherein

• 90% by mol or more of the total quantity of terminal groups of all the compounds in the composition is hydroxy groups, and
• the number of functional groups calculated according to the following expression (II) is 2.20 to 10.00;
• and
• wherein in infrared absorption spectrum absorbance measured by FT-IR, when a height of an infrared absorption spectrum absorbance (Abs) peak around a wavenumber of 1691 cm−1 from the urethane structure represented by the formula (B) is defined as PB and when a height of an infrared absorption spectrum absorbance (Abs) peak around a wavenumber of 3000 to 3800 cm−1 from a hydroxy group is defined as POH, a value of PB/POH is 1.00 to 3.50:
• wherein R represents a divalent linear, branched or cyclic aliphatic hydrocarbon group optionally containing a heteroatom, or a divalent aromatic hydrocarbon group optionally containing a heteroatom,
• the number of functional groups=Mn×OHV/56.11/1000 (II)
• wherein Mn represents a number-average molecular weight of the polycarbonate polyol composition determined by GPC measurement, and OHV represents a hydroxy value of the polycarbonate polyol composition, and wherein in infrared absorption spectrum absorbance measured by FT-IR, when a height of an infrared absorption spectrum absorbance (Abs) peak around a wavenumber of 1743 cm−1 from the carbonate structure represented by the formula (A) is defined as PA and when a height of an infrared absorption spectrum absorbance (Abs) peak around a wavenumber of 1691 cm−1 from the urethane structure represented by the formula (B) is defined as PB, a value of PB/PA is 0.05 to 1.00.