C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/90 (2006.01) B29C 47/76 (2006.01)
Patent
CA 2227609
Disclosed is a process for removing acetaldehyde from polyester which comprises the steps of: (a) transporting molten polyester to a vented, continuous screw conveyor having a polymer compression zone, (b) rotating the screw of said conveyor so as to compress and convey through the extruder the molten polymer for a time of less than 15 minutes and at a temperature of less than 300 ~C, (c) simultaneously with step (b), flowing a purge agent into and out of said extruder to thereby remove volatile impurities and avoid appreciable build-up of acetaldehyde, and (d) conveying the devolatized polymer melt to a mold wherein an article of manufacture is formed.
L'invention concerne un procédé permettant d'extraire l'acétaldéhyde du polyester et consistant: (a) à transporter le polyester en fusion vers un convoyeur à vis sans fin aéré possédant une zone de compression de polymère; (b) à mettre en rotation la vis dudit convoyeur de manière à comprimer et à transporter le polymère en fusion à travers l'extrudeuse pendant une durée inférieure à 15 minutes et à une température inférieure à 300 ·C; (c) simultanément à l'étape (b), à provoquer l'écoulement d'un agent de purge vers l'intérieur et vers l'extérieur de ladite extrudeuse de manière à éliminer les impuretés volatiles et à empêcher une formation importante d'acétaldéhyde; (d) à transporter le polymère en fusion rendu non volatil vers un moule servant à fabriquer un article.
Cherry Clinton
Nelson Gregory Wayne
Olsen Eric Gray
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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