Method for the direct production of polyester articles for...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/78 (2006.01) C08G 63/88 (2006.01) C08G 63/91 (2006.01) C08J 5/00 (2006.01)

Patent

CA 2647633

The present invention is related to a method for the direct production of polyester articles for packaging purposes, in particular for the production of hollow bodies, thermoformed sheets and films, said articles containing an amount of acetaldehyde less than 10 ppm. This method is characterised in that it essentially comprises a step in which the initial level SE0 of the sum of end groups in the polymer melt is increased by adding a mixture of at least one inert and at least one reactive substance to said polymer melt to a second level SE1 and a degassing step consisting in essentially applying a vacuum to the previously obtained polymer melt to cause a removal of low molecular weight substances present and formed, of non reacted reactive substance(s) and inert substance(s) added during previous step before the so obtained polymer melt is directly converted into the desired articles.

La présente invention concerne un procédé de production directe d'articles en polyester destinés à constituer des emballages, ledit procédé étant en particulier destiné à produire des corps creux, des feuilles et des films thermoformés, lesdits articles ayant une teneur en acétaldéhyde inférieure à 10 ppm. Ce procédé est caractérisé en ce qu'il comprend sensiblement : une étape au cours de laquelle le niveau initial SE0 de la somme des groupes terminaux dans le polymère fondu est augmenté jusqu'à un second niveau SE1 par ajout audit polymère fondu d'un mélange comprenant au moins une substance inerte et une substance réactive; et une étape de dégazage consistant sensiblement à appliquer du vide au polymère fondu obtenu à l'étape précédente afin d'éliminer les substances à bas poids moléculaire, constituées des substances réactives et des substances inertes n'ayant pas réagi ajoutées à l'étape précédente. Ainsi, le polymère fondu obtenu est directement converti pour former les articles désirés.

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