| abstract |
The urethane resin solution which provides a urethane resin with low elongation elastic modulus, low elastic modulus under low temperature, good elastic recovery property, and excellent heat resistance and adhesiveness, its manufacturing method, and manufacturing method of urethane resin is provided. Polyether esterdiol having a molecular weight of 800 to 4000, obtained by ring-opening polymerization of a mixture of alkylene oxide and lactone monomer, using a polymetal cyanide complex catalyst as an initiator, using a polyoxytetramethylenediol having a molecular weight of 500 to 2500, as desired. A polyisocyanate compound is reacted to synthesize an isocyanate group terminal prepolymer, and the prepolymer is reacted with a chain extender made of a low molecular weight diamine and / or a low molecular weight diol or the like in an organic solvent. After molding the obtained urethane resin solution into a predetermined shape or applying or impregnating the substrate, an organic solvent is removed to obtain a urethane resin. |