Process for polymerizing a cationically polymerizable olefin

C - Chemistry – Metallurgy – 08 – F

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C08F 10/10 (2006.01) C08F 4/643 (2006.01) C08F 10/00 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2337003

A process for polymerizing a cationically polymerizable olefin such as a mixtrue of isoprene and isobutylene to produce butyl rubber. The process is conducted at subatmospheric pressure in the presence of a conventional cationic polymerization catalyst system. The preferred cationic polymerization catalyst system comprises Cp*TiMe3 and B(C6H5)3. By conducting the process in this manner at subatmospheric pressure, a polymer having desirable molecular weight properties may be produced at a higher temperature than conventional means thereby lower capital and operating costs of the plant producing the polymer product.

La présente invention concerne un procédé de polymérisation d'une oléfine à polymérisation cationique telle qu'un mélange d'isoprène et d'isobutylène, afin de produire du butyle. Le procédé est conduit sous pression réduite en présence d'un système conventionnel de catalyseur de polymérisation cationique. Un catalyseur de polymérisation cationique préféré comprend Cp*TiMe¿3? et B(C¿6?H¿5?)¿3?. En conduisant le procédé de cette manière, sous pression réduite, on peut obtenir, à température plus élevée, comparativement aux moyens habituels, un polymère avec des caractéristiques de poids moléculaire recherchées, ce qui permet d'abaisser les coûts de production et en capital de l'installation de production de ce polymère.

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