Process and apparatus for crystallization of...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/88 (2006.01) B29B 9/16 (2006.01) C08G 63/183 (2006.01)

Patent

CA 2468414

Disclosed is a process for reducing the self-adhesiveness of polytrimethylene terephthalate pellets, which can be carried out in a continuous or batch manner comprising the steps of: a) introducing polytrimethylene terephthalate pellets having an intrinsic viscosity of at least 0.4 dl/g into a conduit containing a liquid which is moving through the conduit, thereby causing the pellets to move through the conduit with the liquid; b) adjusting the temperature of the pellets and the liquid to a temperature of 50 to 95 ~C for a time sufficient to induce a degree of crystallinity of at least 35 % in the pellets; and c) separating the pellets from the liquid.

L'invention concerne un procédé, destiné à réduire l'auto-adhérence de granulés de polytriméthylène téréphtalate, pouvant être mis en oeuvre de façon continue ou par lot, consistant a) à introduire des granulés de polytriméthylène téréphtalate, de viscosité intrinsèque d'au moins 0,4 dl/g, dans un conduit contenant un liquide en mouvement, ce qui oblige les granulés à se déplacer avec le liquide à travers le conduit, b) à régler la température des granulés et du liquide entre 50 et 95 ·C pendant une durée qui suffit à induire dans les granulés un degré de cristallinité d'au moins 35 %, et c) à séparer les granulés du liquide.

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