OXYTETRAMETHYLENE GLYCOL COPOLYMER AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number aver- age molecular weight Mn, a specific molecular weight distribution Mn/Mw, a specific neopentyl glycol copoly- merization whole ratio N W and a specific neopentyl gly- col copolymerization partial ratio N h, and a method for producing the same. Also disclosed is a method for pu- rifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copoly- mer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the un- reacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.