| abstract |
Polytetrahydrofuran, tetrahydrofuran copolymers, and diesters or monoesters of these polymers contain, in catalytically active amounts, one or more oxygen-containing molybdenum and / or tungsten compounds as active compositions on oxide support materials, Prepared by polymerizing tetrahydrofuran in the presence of at least one telogen and / or comonomer on a heterogeneous support catalyst calcined at a temperature of 500 ° C. to 1000 ° C. when the precursor compound of the active composition is applied to the support material precursor. do. Catalysts used include promoters of at least one element of Groups 2, 3, 5, 6, 7, 7, 8, or 14 of the Periodic Table of the Elements or compounds of such elements. |