Process for producing polyester articles having low...

Details Process for producing polyester articles having low... Process for producing polyester articles having low...

C - Chemistry, Metallurgy

08

G

C08G 63/90 (2006.01) C08G 63/16 (2006.01) C08G 63/88 (2006.01)

Patent

CA 2226884

Disclosed is a process for producing molded polyester articles having a low acetaldehyde content comprising the steps of: a) reacting a glycol and a dicarboxylic acid in the melt phase to form a polyester having an I.V. of 0.65- 0.85; b) solidifying and pelletizing said polyester; c) remelting said polyester in an extruder; and d) forming said polyester into shaped articles, wherein the polyester is devolatilized during or following said polymerization in the melt, while it is being remelted, after remelting, or any combination by passing a purge gas over said molten polyester.

L'invention porte sur un procédé de production d'articles moulés en polyester à faible teneur en acétaldhéyde comportant les étapes suivantes: (a) faire réagir du glycol et de l'acide dicarboxyloque en phase fondue pour obtenir un polyester présentant un I.V. de 0,65 - 0,85; (b) solidifier et mettre en granulés ledit polymère; (c) faire refondre ledit polymère dans une extrudeuse; et (d) produire des articles moulés à partir dudit polymère. Ledit polymère subit pendant ou après sa polymérisation à l'état fondu, soit pendant qu'il est refondu, soit après refonte, soit dans des conditions combinant ces deux états, une extraction des matières volatiles consistant à faire passer un gaz de purge sur le polymère à l'état fondu.

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