Process for increasing the molecular weight of polyamides...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 69/04 (2006.01) C08G 63/183 (2006.01) C08G 63/78 (2006.01) C08G 63/83 (2006.01) C08G 63/87 (2006.01) C08G 69/28 (2006.01)

Patent

CA 2182872

This invention concerns a process for increasing the molecular weight and viscosity of polyamides and other condensation polymers, by first injecting an inert gas into the polymer melt at elevated pressure, then stripping the volatiles from the polymer through the application of reduced pressure, followed by holding the polymer at elevated temperatures long enough for the reaction to occur. Activators may be added to the polymer. Port areas used in the stripping zone, may be kept hot for continuous operation.

L'invention concerne un procédé servant à augmenter le poids moléculaire et la viscosité de polyamides et d'autres polymères de condensation par injection d'un gaz inerte, dans le polymère fondu à pression élevée, par extraction des produits volatils du polymère au moyen de l'application d'une pression réduite suivie par le maintien du polymère à des températures élevées pendant une durée suffisamment longue pour que la réaction s'effectue. On peut ajouter des agents d'activation au polymère. Les zones d'ouvertures utilisées dans la région d'extraction peuvent être maintenues à une température élevée, afin que l'opération s'effectue en continu.

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