发明授权
US5463020A Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene oxide copolymers 失效
聚四氢呋喃或四氢呋喃/烯化氧共聚物的制备

Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene oxide
copolymers
摘要:
Polytetrahydrofuran or C.sub.2 -C.sub.10 -alkylene oxide/tetrahydrofuran copolymers having a molecular weight of from 250 to 20,000 Dalton are prepared by the cationic polymerization of tetrahydrofuran or tetrahydrofuran and C.sub.2 -C.sub.10 -alkylene oxides in the prsence of a promoter by a process in which the catalyst used is a mixture of one or more C.sub.2 -C.sub.6 -di- or tricarboxylic acids with boric acid.
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