Method for producing an aromatic polycarbonate

C - Chemistry – Metallurgy – 08 – G

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C08G 64/04 (2006.01)

Patent

CA 2168630

A method for producing an aromatic polycarbonate comprises feeding to a feeding zone (having a foraminous plate) at least one polymerizing material selected from the group consisting of a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the polymerizing material to pass downwardly through the foraminous plate and fall along and in contact with a wire through a wire-wetting fall polymerization reaction zone, thereby effecting polymerization of the polymerizing material during the wire-wetting 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'alimentation (comportant un plateau foraminé) au moins une matière à polymériser, choisie dans le groupe constitué a) d'un mélange monomère fondu d'un composé aromatique dihydroxylé et d'un carbonate diarylique, et b) d'un prépolymère fondu obtenu par réaction d'un composés aromatique dihydroxylé avec un carbonate diarylique; et à laisser la matière à polymériser descendre à travers le plateau foraminé pour tomber le long d'un câble et en contact avec celui-ci dans une zone de polymérisation à mouillage, où s'effectue cette dernière.Des polycarbonates transparents et de grande qualité sont ainsi produits de façon stable et à un taux élevé de polymérisation pendant une période de temps prolongée, grâce à un appareil possédant d'excellentes propriétés de scellage sous un vide poussé, et d'entretien facile.

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