| 摘要 |
PROBLEM TO BE SOLVED: To provide a copolymerized polyether which is so practical as to permit a stable reaction without causing a gelation or an abnormal reaction when a polyurethane is manufactured by reacting a polyether with an isocyanate compound. SOLUTION: The copolymerized polyether (A) is characterized in that it is a polyether formed by a ring-opening addition copolymerization of at least two kinds of alkylene oxides containing tetrahydrofuran as the essential component to an active hydrogen-containing compound (a) in the presence of an acidic catalyst (c) containing one or more kinds of elements (b) selected from the group consisting of B, Al, Sn, Sb, Fe, P, Zn, Ti, Zr and Be, and in that the above polyether has a (b) content of 5 ppm or less. COPYRIGHT: (C)2004,JPO&NCIPI
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