Process for the preparation of polyalkenyl acylating agents

C - Chemistry – Metallurgy – 08 – F

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C08F 8/46 (2006.01)

Patent

CA 2658588

Process for the preparation of polyalkenyl acylating agents which comprises: a. reacting at a temperature higher than 1800C a reactive polyalkene, having a number average molecular weight Mn ranging from 500 to 5000 and having a content of terminal vinylidene groups greater than or equal to 3 0%, with an enophile; b. thermally carrying out the reaction for a time suffcient for having a conversion of the terminal vinylidene groups higher than 15%; c. completing the reaction always under heat in the pres- ence of a reaction accelerator consisting of a Lewis acid selected from a tin, zinc, aluminum or titanium halide.

L'invention concerne un procédé destiné à la préparation d'agents d'acylation de polyalcényle, consistant: a. à faire réagir à une température supérieure à 180°C un polyalcène réactif, possédant un poids moléculaire moyen en nombre Mn compris entre 500 et 5000 et présentant une teneur en groupes terminaux vinylidène supérieure ou égale à 30%, avec un énophile; b. à poursuivre la réaction thermique pendant un laps de temps suffisant pour obtenir la conversion d'au moins 15% des groupes terminaux vinylidène; c. à terminer la réaction thermique en présence d'un accélérateur de réaction comprenant un acide de Lewis sélectionné parmi de l'étain, du zinc, de l'aluminium ou un halogénure de titane.

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