Process for producing polytrimethylene terephthalate

C - Chemistry – Metallurgy – 08 – G

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C08G 63/183 (2006.01)

Patent

CA 2582410

A process for the production of polytrimethylene terephthalate (PTT), wherein the process comprises: (i) one or more esterification steps, wherein terephthalic acid (TPA) or an alkyl diester of terephthalic acid is reacted with 1,3-propanediol (PDO); and (ii) one or more subsequent polycondensation steps, wherein the process further comprises the addition of a protic acid, other than terephthalic or isophthalic acid, before and/or during the one or more esterification steps, wherein the protic acid has a dissociation constant of at most 4 (pKa measured in water at 25 ~C), and wherein the total amount of protic acid added before and/or during the one or more esterification steps is in the range of from 0.001 to 10 millimole of acid per kilogram of polytrimethylene terephthalate produced.

L'invention concerne un procédé de production de polytriméthylène téréphtalate (PTT), ce procédé comprenant : (i) une ou plusieurs étapes d'estérification, au cours desquelles de l'acide téréphtalique (TPA) ou un diester d'alkyle de l'acide téréphtalique sont mis en réaction avec du 1,3-propanediol (PDO) ; et (ii) une ou plusieurs étapes ultérieures de polycondensation, au cours desquelles un acide protique, autre que l'acide téréphtalique ou isophtalique, est ajouté avant et/ou pendant la ou les étapes d'estérification. L'acide protique présente une constante de dissociation qui n'est pas supérieure à 4 (pKa mesuré dans de l'eau à 25 °C) et la quantité totale d'acide protique ajouté avant et/ou pendant la ou les étapes d'estérification est comprise entre 0,001 et 10 millimoles d'acide par kilogramme de polytriméthylène téréphtalate produit.

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