Method for producing an aromatic polycarbonate

C - Chemistry – Metallurgy – 08 – G

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C08G 64/30 (2006.01) B01J 19/24 (2006.01) C08G 64/20 (2006.01)

Patent

CA 2157686

A method for producing an aromatic polycarbonate comprises introducing to an introduction zone (having a perforated plate) a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, or b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the monomer mixture or prepoly- mer in the molten state to pass downwardly through the perforated plate and fall freely through a free-fall polymerization reaction zone, thereby effecting poly- merization of the monomer mixture or prepolymer during the free-fall thereof. Colorless and high quality aromatic polycarbonates are thus stably produced at a high polymerization rate for a prolonged period of time, using an apparatus which has excellent sealing properties under high vacuum and maintenance of which is easy.

Méthode pour la production d'un polycarbonate aromatique, consistant à introduire dans une zone d'entrée (munie d'une plaque perforée) : a) un mélange monomère fondu d'un composé aromatique dihydroxylé et un carbonate diarylique, ou ; b) un prépolymère obtenu par réaction d'un composé aromatique dihydroxylé avec un carbonate diarylique. On laisse ensuite le mélange monomère ou le prépolymère à l'état fondu descendre à travers la plaque perforée et tomber librement dans une zone de polymérisation à chute libre, la polymérisation du mélange monomère ou du prépolymère s'effectuant lors de la chute. On produit ainsi des polycarbonates aromatiques incolores et de grande qualité, de façon stable et à un taux élevé de polymérisation pendant une période de temps prolongée, à l'aide d'un appareil possédant d'excellentes propriétés de scellage sous un vide poussé, et facile d'entretien.

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