Method for producing highly reactive polyisobutenes

Details Method for producing highly reactive polyisobutenes Method for producing highly reactive polyisobutenes

C - Chemistry, Metallurgy

08

F

C08F 10/10 (2006.01) C08F 4/14 (2006.01)

Patent

CA 2334263

The invention relates to a method for producing highly reactive polyisobutenes containing over 80 mol.% terminal vinylidene groupings and with an average molecular weight of 500 to 5000 Dalton, by cationic polymerisation of isobutene in liquid phase in the presence of a complex consisting of boron trifluoride, at temperatures of +40 ~C to 60 ~C. According to said method, the polymerisation is carried out in the presence of a complex consisting of boron trifluoride and a) a primary alcohol with 1 to 20 C-atoms or a secondary alcohol with 3 to 20 C-atoms or a mixture of these alcohols and b) an ether which is free of tertiary alkyl groups, of formula (I) R1-O-R2 wherein R1 and R2 are primary or secondary alkyl groups with 3 to 10 C-atoms, with the condition that at least one of the groups R1 and R2 is a secondary alkyl group.

L'invention concerne un procédé permettant de préparer des polyisobutènes très réactifs, contenant plus de 80 % en mole de groupements vinylidène terminaux et ayant un poids moléculaire moyen compris entre 500 et 5.000 Dalton, par polymérisation cationique d'isobutène en phase liquide en présence d'un complexe de trifluorure de bore, à des températures comprises entre +40 et -60 ·C. Selon ce procédé, on polymérise en présence d'un complexe de trifluorure de bore et a) d'un alcool primaire ayant entre 1 et 20 atomes de C ou un alcool secondaire ayant entre 3 et 20 atomes de C ou un mélange de ces alcools et b) d'un éther exempt de groupes alkyle tertiaires de la formule (I) R?1¿-O-R?2¿, dans laquelle R?1¿ et R?2¿ désignent des groupes alkyle secondaires ayant entre 3 et 20 atomes de C, sous réserve qu'au moins un des groupes R?1¿ et R?2¿ soit un groupe alkyle secondaire.

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