Patent ID: 8431672

Claim:
A method for manufacturing an isocyanate group-terminated prepolymer, comprising: (a) performing a ring-opening polymerization of an alkyleneoxide-containing cyclic compound by using an initiator in a presence of a composite metal cyanide complex catalyst in such an amount that an amount of a metal derived from the composite metal cyanide complex catalyst becomes from 1 to 30 ppm by mass based on a polyol obtained by the ring-opening polymerization, thereby obtaining a polyol composition comprising the polyol and the composite metal cyanide complex catalyst; (b) adding water in an amount of 0.05 to 20% by mass based on the polyol composition to the polyol composition from which the composite metal cyanide complex catalyst has not been removed and performing a heat treatment of the polyol composition comprising the water in a closed system; (c) subjecting the polyol composition after the heat treatment to a dehydration treatment until a water content in the polyol composition becomes from 5 to 500 ppm by mass; and (d) adding a polyisocyanate compound to the polyol composition after the dehydration treatment such that the polyisocyanate compound reacts with the polyol in the polyol composition, wherein the performing of the heat treatment comprises contacting carbon dioxide with the polyol composition such that a partial pressure of the carbon dioxide is from 0.01 to 5 MPa.