| abstract |
The present invention relates to a process for the preparation of polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers with a low color number, which is characterized in that the polymers obtained by cationic polymerization of tetrahydrofuran in the presence of a macroporous, supported heterogeneous catalyst, which is the active metal contains at least one metal from sub-groups VII to X. of the Periodic Table of the Elements. |