Preparation of homo-and copolymers of isobutene

C - Chemistry – Metallurgy – 08 – F

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C08F 10/10 (2006.01) C08F 2/01 (2006.01) C08F 2/06 (2006.01) C08F 4/00 (2006.01) C08F 4/06 (2006.01) C08F 4/12 (2006.01) C08F 4/16 (2006.01) C08F 10/00 (2006.01) C08F 10/08 (2006.01) C08F 110/10 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2448143

The invention relates to a method for producing homopolymers and copolymers of isobutene by the 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 among covalent metal- halogen compounds and covalent semimetal-halogen compounds; ii) at least one aprotic organic compound (I) having at least one functional group (FG) which, under polymerization conditions, forms a carbocation or a cationogenic complex with the Lewis acid, in an organic solvent that is inert to the Lewis acid. The inventive method is characterized in that the polymerization is carried out in a tubular continuous flow reactor that has a number of bends with an alternating bending direction.

L'invention concerne un procédé pour réaliser des copolymères et des homopolymères d'isobutène par polymérisation cationique continue d'isobutène ou de mélanges d'isobutène avec des comonomères éthyléniquement insaturés en présence d'un système initiateur comprenant : i) un acide de Lewis, sélectionné parmi des composés d'halogénures métalliques covalents et des composés d'halogénures semi-métalliques covalents ; ii) au moins un composé organique aprotique I comportant au moins un groupe fonctionnel FG, formant, dans des conditions de polymérisation, une carbocation ou un complexe cationique avec l'acide de Lewis, dans un support de solution organique inerte par rapport à l'acide de Lewis. L'invention est caractérisée en ce que la polymérisation est effectuée dans un réacteur tubulaire à écoulement qui comporte plusieurs lacets à direction alternée.

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