Abstract: The polymerization of cycloalkenamer is stopped by adding an alkyl vinyl derivative. Subsequently compound A is added, wherein compound A has at least one of the features i) or ii): i) at least one functional group or ii) at least one saturated or unsaturated aliphatic or aromatic heterocyclic ring having 3 to 14 ring atoms, wherein the ring atoms contain at least one carbon atom and at least one atom selected from oxygen, nitrogen and sulfur. A membrane filtration is subsequently carried out. This type of production produces polyalkenamers which are temperature-stable at 180° C.

Abstract: The polymerization of cycloalkenamer is stopped by adding an alkyl vinyl derivative. Subsequently compound A is added, wherein compound A has at least one of the features i) or ii): i) at least one functional group or ii) at least one saturated or unsaturated aliphatic or aromatic heterocyclic ring having 3 to 14 ring atoms, wherein the ring atoms contain at least one carbon atom and at least one atom selected from oxygen, nitrogen and sulfur. A membrane filtration is subsequently carried out. This type of production produces polyalkenamers which are temperature-stable at 180° C.

Abstract: The present invention relates to a process for producing cycloalkenamer-containing compositions. The polymerization of cycloalkenamer is stopped by addition of alkyl vinyl ethers. This is followed by a membrane filtration. This type of production affords polyalkenamers that are thermally stable at 180° C.