| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for removing the sodium once more which derives from a catalyst after transesterification with minimum facilities. SOLUTION: For producing a hydroxyl group-containing polymer, especially a polytetrahydrofuran containing a hydroxyl end group, a corresponding acyloxy group-containing polymer, used as a start material, is transesterified with an alcohol in the presence of a sodium-containing catalyst, and for removing sodium cations, following the transesterification, in a catalytic amount of water, the polytetrahydrofuran solution is directly introduced into at least one ion exchanger and allowed to flow through it. |
