Process for esterifying 1,3-propanediol

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/85 (2006.01) C07C 67/08 (2006.01) C08G 63/16 (2006.01) C08G 63/181 (2006.01)

Patent

CA 2366515

A process that can be used in an esterification and polycondensation processes to produce a polyester such as, for example, poly(trimethylene terephthalate) is disclosed. The process comprises contacting an acid with 1,3-propanediol in the presence of a catalyst comprising tin and titanium. A copolymer that contains up to 20 mole percent of another acid and/or a second alcohol is also disclosed. Further disclosed are a composition of, or comprising, a bis(3- hydroxypropyl) terephthalate prepolymer or a composition of, or comprising, a poly(trimethylene terephthalate) polymer. The bis(3-hydroxypropyl) terephthalate prepolymer and poly(trimethylene terephthalate) can each contain 10 to 100 ppm tin and 10 to 200 ppm titanium relative to the terephthalic acid content.

L'invention concerne un procédé pouvant être utilisé dans des procédés d'estérification et de polycondensation destinés à produire un polyester tel que, par exemple, du poly(triméthylène téréphtalate). Le procédé comporte la mise en contact d'un acide avec du 1,3-propanediol en présence d'un catalyseur contenant de l'étain et du titane. L'invention concerne aussi un copolymère qui contient jusqu'à 20 pour cent molaire d'un autre acide et/ou d'un deuxième alcool. L'invention concerne en outre une composition renfermant un prépolymère de bis(3-hydroxypropyl) téréphtalate ; ou une composition renfermant un polymère de poly(triméthylène téréphtalate). Le prépolymère de bis(3-hydroxypropyl) téréphtalate et le polymère de poly(triméthylène téréphtalate) peuvent contenir chacun de 10 à 100 ppm d'étain, et de 10 à 200 ppm de titane par rapport à la teneur en acide téréphtalique.

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