Process for the continuous production of polyesters

Details Process for the continuous production of polyesters Process for the continuous production of polyesters

C - Chemistry, Metallurgy

08

G

C08G 63/78 (2006.01)

Patent

CA 2732419

Continuous process for the ring-opening polymerisation of cyclic ester monomers to form aliphatic polyesters at a temperature between 100-240°C which comprises the steps of : a) continuously providing cyclic ester monomer and polymerisation catalyst to a continuous mixing reactor, the reactor being operated at conditions effective for polymerisation to form a prepolymerised reaction mixture, b) continuously removing pre-polymerised reaction mixture from the continuous mixing reactor and continuously providing pre-polymerised reaction mixture to a plug flow reactor, the plug flow reactor being operated under polymerisation conditions, wherein the reaction mixture is polymerised to a degree of polymerisation of at least 90%, to form polymer c) continuously removing polymer from the plug flow reactor.

Linvention concerne un processus en continu pour la polymérisation par ouverture de cycle de monomères esters cycliques pour former des polyesters aliphatiques à une température entre 100 et environ 240 °C, qui consiste : a) à fournir en continu un monomère ester cyclique et un catalyseur de polymérisation à un réacteur de mélange en continu, le réacteur fonctionnant dans des conditions efficaces de polymérisation pour former un mélange réactionnel pré-polymérisé, b) à retirer en continu le mélange réactionnel pré-polymérisé du réacteur de mélange en continu et à fournir en continu un mélange réactionnel pré-polymérisé au réacteur piston, le réacteur piston fonctionnant dans des conditions de polymérisation et le mélange réactionnel étant polymérisé à un degré de polymérisation dau moins 90 %, pour former un polymère et c) à retirer en continu le polymère du réacteur piston.

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