Process for the preparation of polytetrahydrofuran

摘要

A process for the preparation of polytetrahydrofuran or polytetrahydrofuran monoesters with C1- to C20-monocarboxylic acids or polytetrahydrofuran monoethers with monohydric C1- to C20-alcohols having a mean molecular weight of from 250 to 15,000 daltons by cationic polymerisation of tetrahydrofuran in the presence of a telogen, characterised in that tetrahydrofuran is polymerised in the presence of water, 1,4-butanediol and/or polytetrahydrofuran having a mean molecular weight of from 200 to 700 daltons and/or in the presence of a C1- to C20-monocarboxylic acid and/or a monohydric C1- to C20-alcohol with the aid of a catalytically effective amount of a bleaching earth catalyst.