Process for producing polyethylene terephthalate

Details Process for producing polyethylene terephthalate Process for producing polyethylene terephthalate

C - Chemistry, Metallurgy

08

G

C08G 63/183 (2006.01) C08G 63/78 (2006.01) C08G 63/80 (2006.01) C08G 63/88 (2006.01)

Patent

CA 2190274

A process for producing a polyethylene terephthalate in which the amount of the oligomers, such as cyclic trimer etc., is lower and which causes metal mold staining to occur difficultly. The process comprises an esterification stage in which dicarboxylic acids including mainly terephthalic acid or ester- forming derivatives of such acids are esterified with glycols including mainly ethylene glycol or with ester-forming derivatives of such glycols; a liquid phase polycondensation stage in which the esterified product obtained in the esterification stage is subjected to a polycondensation in a liquid phase containing a polycondensation catalyst and having a content of an alkaline solubilizing agent of 0.4 mole or less per mole of the polycondensation catalyst with heating; a solid phase polycondensation stage in which the polycondensation product obtained in the liquid phase polycondensation stage is heated at a temperature below the melting point of the product in an inert atmosphere; and an aqua-treatment stage in which the polycondensation catalyst is deactivated by contacting the polycondensation product obtained in the solid phase polycondensation stage with water. The polyethylene terephthalate obtained by this process is suitable as the material for containers to be charged with drinks.

La présente invention concerne un procédé de production de téréphtalate de polyéthylène dont la quantité d'oligomères est réduite, comme dans le cas du trimère cyclique produit lors du moulage, et qui, par conséquent, souille peu les moules. Ce procédé comprend l'estérification d'un constituant acide dicarboxylique comprenant principalement l'acide téréphtalique, ou l'un de ses dérivés formant des esters, avec un constituant glycol comprenant principalement de l'éthylène glycol ou l'un de ses dérivés formant des esters, une polycondensation en phase liquide concernant l'ester obtenu dans l'estérification ci-dessus avec chauffage en phase liquide contenant un catalyseur de polycondensation et un agent alcalin de solubilisation à raison de 0,4 mole au maximum par mole de catalyseur, une polycondensation en phase solide, consistant à chauffer le polycondensat obtenu par la polycondensation en phase liquide ci-dessus en atmosphère inerte, à une température qui ne dépasse pas son point de fusion, et un traitement aqueux consistant à mettre le polycondensat obtenu par la polycondensation en phase solide en contact avec de l'eau pour désactiver le catalyseur. Le téréphtalate de polyéthylène produit selon ce procédé convient pour constituer des bouteilles destinées à contenir des boissons.

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