| 摘要 |
PURPOSE:To provide the titled copolymer having a group other than oxytetramethylene group in the molecule, by reacting a polyhydric alcohol with tetrahydrofuran in the presence of a water-coordinated or water-containing heteropolyacid as a catalyst. CONSTITUTION:A heteropolyacid containing or coordinated with <=15mol of water per 1mol of the acid, and obtained by condensing one or more oxides of Mo, W and V with the oxyacid of P, Si, As, B, etc., wherein the atomic ratio of the former component to the latter component is 2.5-12, e.g. phosphomolybdic acid, phosphotungstic acid, etc. is used as a catalyst. The objective copolymer can be produced by reacting an alcohol having >=2 hydroxyl groups in one molecule, e.g. ethylene glycol, propylene glycol, etc. with tetrahydrofuran in the presence of the above catalyst, preferably at 0-150 deg.C.
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