C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/78 (2006.01) C08G 63/80 (2006.01) C08G 63/88 (2006.01) C08G 63/183 (2006.01)
Patent
CA 2352664
The present invention refers to a process for manufacturing polyester comprising at least the following steps: a) esterifying or transesterifying a carboxylic diacid or a diester of a carboxylic diacid with a diol, b) polymerizing in melt phase the esterification or transesterification product, c) solidifying and granulating, d) placing in contact the granules with a liquid swelling medium, e) post-condensing the granules in solid phase. The realization of the immersion step in a swelling medium permits increasing the kinetics of the solid phase post-condensation step.
L'invention concerne un procédé de fabrication du polyester, qui consiste à (a) estérifier ou à transestérifier un diacide carboxylique ou un diester d'un diacide carboxylique avec un diol; (b) à polymériser, en phase de fusion, le produit d'estérification ou de transestérification; (c) à solidifier et à granuler; (d) à placer les granules en contact avec un milieu de gonflement liquide; (e) à post-condenser les granules en phase solide. La réalisation de l'étape d'immersion dans un milieu de gonflement liquide permet d'augmenter la cinétique de l'étape post-condensation en phase solide.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Rhodia Ster S.a.
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