US 6,441,110 B1Granted

Method for producing halogen-free reactive polyisobutene

AssigneeBASF SE

InventorsChristoph Sigwart, Thomas Narbeshuber, Karsten Eller, Manfred Barl, Rolf Fischer, Eugen Gehrer

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Abstract

A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 50 mol % and an average molecular weight Mn of 280-10000 dalton by the cationic polymerization in the liquid phase of isobutene or hydrocarbon mixtures comprising isobutene comprises polymerizing at from −30° C. to +40° C. in the presence of a heterogeneous polymerisation catalyst comprising one or more oxides of the elements of transition groups V and VI of the Periodic Table of the Elements or in the presence of a heterogeneous polymerization catalyst comprising one or more oxidic compounds of one or more elements of transition groups V and VI of the Periodic Table of the Elements supported on a non-zeolitic oxidic support material which is not an oxygen-containing zirconium compound, the catalyst not containing a technically effective amount of halogen.

Claims7

Dependent claims

A process for preparing a halogen-free, reactive polyisobutene having a terminal double bond content of more than 50 mol % and an average molecular weight Mn of 280-10000 dalton which comprises:

carrying out a cationic polymerization of isobutene in a liquid phase consisting essentially of isobutene or mixtures thereof with a liquid hydrocarbon at a temperature of from −30° C. to 40° C. in the presence of at least one heterogeneous polymerization catalyst which is substantially free of halogen and is selected from the group consisting of the oxides of the transition elements of Groups V and VI of the Periodic Table of Elements, said catalyst being unsupported or optionally supported on one or more compounds which are non-zeolitic oxides of at least one metal selected from the group consisting of the elements of the main Groups II, III and IV and also the transition metals of Groups I, II, III, IV, VII and VIII of the Periodic Table of Elements, but excluding all oxygen-containing zirconium compounds.

Dependencies are inferred from the claim text.