Catalyst and method for producing polytetrahydrofuran

Details Catalyst and method for producing polytetrahydrofuran Catalyst and method for producing polytetrahydrofuran

C - Chemistry, Metallurgy

08

G

C08G 65/20 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2313186

The invention relates to a method for producing polytetrahydrofuran and polytetrahydrofuran copolymers, diesters or monoesters thereof by polymerising tetrahydrofuran in the presence of at least one telogen and/or comonomer on acid- activated montmorillonite catalysts, whereby the ratio of the montmorillonite structure to the sum of the muscovite and kaolin structure in the montmorillonite catalyst, which is determined from the intensities of the reflexes measured at 5.5~ 2È for montmorillonite, 9.0~ 2È for muscovite and 12,5~ 2È for kaolin is, after acid activation, at least 5:1.

L'invention concerne un procédé de production de polytétrahydrofurane, de copolymères de polytétrahydrofurane, ou de diesters ou bien de monoesters de ceux-ci, par polymérisation de tétrahydrofurane en présence d'au moins un télogène et/ou d'un conomère, sur des catalyseurs à la montmorillonite activés par acide. Dans le catalyseur à la montmorillonite, après son activation par acide, le rapport quantitatif de la structure de montmorillonite à la structure comprenant la muscovite et le kaolin, déterminé à partir des intensités des reflets mesurés par diffractométrie par rayons X sur poudre, à 5,5· 2¿È? pour la montmorillonite, à 9,0· 2¿È? pour la muscovite et à 12,5· 2¿È? pour le kaolin, est d'au moins 5:1.

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