Continuous process for producing poly(trimethylene...

C - Chemistry – Metallurgy – 08 – G

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

Patent

CA 2396465

A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a prepolymerizer. Bis-3-hydroxypropyl terephthalate and the low molecular weight polyesters are continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a first stream of gaseous by- products. Poly(trimethylene terephthalate) prepolymer having a relative viscosity of at least about 5 is continuously withdrawn from the prepolymerizer and continuously fed to a final polymerizer, where it is continuously polymerized to form a higher molecular weight poly(trimethylene terephthalate) and a second stream of gaseous by-products. Higher molecular weight poly(trimethylene terephthalate) having a relative viscosity of at least about 17 is continuously withdrawn from the final polymerizer.

L'invention concerne un procédé de production en continu de poly(triméthylène téréphtalate). Le procédé comporte les étapes consistant à charger un mélange de charge liquide contenant du bis-3-hydroxypropyl téréphtalate et/ou des polyesters de faible poids moléculaire de 1,3-propanediol et d'acide téréphtalique, qui présente un rapport molaire groupes de propylène sur groupes de téréphtalate compris entre 1,1 et 2,2, dans un dispositif de prépolymérisation; à polymériser en continu le bis-3-hydroxypropyl téréphtalate et les polyesters de faible poids moléculaire pour former un prépolymère de poly(triméthylène téréphtalate) et un premier écoulement de sous-produits gazeux; à retirer en continu le prépolymère de poly(triméthylène téréphtalate), qui présente une viscosité relative d'au moins environ 5, du dispositif de prépolymérisation et à le charger dans un dispositif de polymérisation finale où il est polymérisé en continu pour former un poly(triméthylène téréphtalate) de poids moléculaire supérieur et un deuxième écoulement de sous-produits gazeux; et à retirer en continu le poly(triméthylène téréphtalate) de poids moléculaire supérieur, qui présente une viscosité relative d'au moins environ 17, du dispositif de polymérisation finale.

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