METHOD FOR PRODUCING POLYCARBONATE DIOL AND POLYCARBONATE DIOL AND METHOD FOR PRODUCING POLYURETHANE AND POLYURETHANE

摘要

The present invention provides a polycarbonate diol that improves the reaction speed when preparing a polyurethane by reacting a polycarbonate diol with an isocyanate compound, thereby improving the tensile strength, elastic recovery rate, and the like of the obtained polyurethane. The dihydroxy compound and the carbonate compound are polymerized by transesterification in the presence of sugars and / or derivatives thereof to obtain a polycarbonate diol. The content of the sugar and / or its derivative is 0.1 to 80 ppm by weight based on the total of the sugar and / or its derivative and its dihydroxy compound.