Manufacruring method of polyethylene terephthalate

C - Chemistry – Metallurgy – 08 – G

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C08G 63/80 (2006.01) C08G 63/87 (2006.01) C08J 5/00 (2006.01)

Patent

CA 2646576

Disclosed is a process for production of a polyethylene terephthalate, which comprises the steps of: conducting melt polycondensation by using a compound represented by the general formula (I) as a polycondensation catalyst to yield a melt-polycondensed polyethylene terephthalate having an intrinsic viscosity ranging from 0.48 to 0.53 dL/g and the number of terminal carboxyl groups ranging from 14 to 22 mmol/kg; and subjecting the melt-polycondensed polyethylene terephthalate to solid-state polycondensation to yield a solid-state-polycondensed polyethylene terephthalate having an intrinsic viscosity ranging from 0.70 to 0.86 dL/g. (I) wherein R1 represents an alkyl group having 2 to 12 carbon atoms. It becomes possible to provide a polyethylene terephthalate which can be molded into an article having a reduced acetaldehyde content and a reduced oligomer content.

L'invention concerne un procédé de production d'un polyéthylène téréphtalate, ledit procédé comprenant les étapes consistant à : effectuer une polycondensation en phase fondue en utilisant un composé de formule générale (I) en tant que catalyseur de polycondensation, afin d'obtenir un polyéthylène téréphtalate polycondensé en phase fondue présentant une viscosité intrinsèque de 0,48 à 0,53 dL/g et un nombre de groupes terminaux carboxyle de 14 à 22 mmol/kg ; puis soumettre ledit polyéthylène téréphtalate polycondensé en phase fondue à une polycondensation en phase solide afin d'obtenir un polyéthylène téréphtalate polycondensé à l'état solide présentant une viscosité intrinsèque de 0,70 à 0,86 dL/g. Dans la formule (I), R1 représente un groupe alkyle ayant de 2 à 12 atomes de carbone. Il est ainsi possible d'obtenir un polyéthylène téréphtalate pouvant former, par moulage, un article présentant une teneur réduite en acétaldéhyde et en oligomères.

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