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AssigneeBASF SE
InventorsStephan Huffer, Hans Peter Rath, Gabriele Lang, Jens Kremeskotter, Elmar Stockelmann
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Homo- and copolymers of isobutene are prepared by continuous cationic polymerization of isobutene or mixtures of isobutene with ethylenically unsaturated comonomers in the presence of an initiator system comprising: i) a Lewis acid selected from covalent metal-halogen compounds and covalent semimetal-halogen compounds and ii) at least one aprotic organic compound I having at least one functional group FG which forms a carbocation or a cationic complex with the Lewis acid under polymerization conditions in an organic solvent inert with respect to the Lewis acid, by a process in which the polymerization is carried out in a tubular flow-through reactor which has a plurality of curves having an alternating direction of curvature.
A process for the preparation of homo- and copolymers of isobutene by continuous cationic polymerization of isobutene or mixtures of isobutene with ethylenically unsaturated comonomers in the presence of an initiator system comprising:
A process as claimed in any of the preceding claims, wherein the Lewis acid is selected from BF3, TiCl4, SnCl4, BCl3, FeCl3, VCl5, AlCl3 and Rc—AlCl2, where Rc is C1-C6-alkyl.
A process as claimed in any of the preceding claims, wherein the functional group in the compound I is of the formula FG
A process as claimed in any of the preceding claims, wherein the compound I is used in an amount of from 10−4 to 10−1 mol, based on the functional groups FG of the compound I, per mole of polymerizable monomers.
A process as claimed in any of the preceding claims, wherein the Lewis acid and the compound I are used in a molar ratio of from 20:1 to 1:50, based on the functional groups FG.
A process as claimed in any of the preceding claims, wherein the initiator system additionally comprises at least one nonpolymerizable, aprotic donor compound having a free electron pair.
A process as claimed in any of the preceding claims, wherein the solvent is selected from aliphatic and cycloaliphatic hydrocarbons, aromatic hydrocarbons and inert halohydrocarbons.
A process as claimed in any of the preceding claims, wherein the polymerization is stopped by adding a protic compound.
Dependencies are inferred from the claim text.