| 摘要 |
In polyoxybutylene polyoxyalkylene glycols obtained by copolymerization of tetrahydrofuran with a 1,2-alkylene oxide in the presence of a compound containing reactive hydrogen and under the catalytic action of a bleaching earth, the content of oligomeric cyclic ethers is reduced by distillation under reduced pressure at above 200 DEG C. after first treating the copolymer with oxygen or an oxygen-containing gas (air) at a temperature of from 20 DEG to 110 DEG C.
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