Process for the preparation of isoolefin copolymers
AssigneeBayer Aktiengesellschaft
InventorsGerhard Langstein, Martin Bohnenpoll
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Abstract
The present invention provides a novel process for the preparation of isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof and organic nitro compounds, especially for the preparation of butyl rubbers, as well as isoolefin copolymers composed of isobutene, isoprene and, optionally, further monomers.
Claims11
A process for the preparation of isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof, comprising the step of carrying out polymerization in the presence of organic nitro compounds.
A mixture comprising zirconium halides or hafnium halides or mixtures thereof and an organic nitro compound of the general formula (I)
- R—NO2 (I)
- wherein R is selected from the group C1-C18-alkyl, C3-C18-cycloalkyl or C6-C24-cycloaryl.
A catalyst comprising a mixture of zirconium halides or hafnium halides or mixtures thereof and an organic nitro compound of the general formula (I)
- R—NO2 (I)
- wherein R is selected from the group Cl-C18-alkyl, C3-C18-cycloalkyl or C6-C24-cycloaryl.
A polymer produced by a process comprising the steps of preparing isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof and carrying out the polymerization in the presence of organic nitro compounds
A molded body comprising a polymer produced by a process comprising the steps of preparing isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof and carrying out the polymerization in the presence of organic nitro compounds
Dependencies are inferred from the claim text.