Production of polytrimethylene ether glycol and copolymers...

C - Chemistry – Metallurgy – 08 – G

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C08G 65/34 (2006.01) C07C 41/09 (2006.01)

Patent

CA 2389578

A process for the manufacture of polytrimethylene ether glycol comprising polycondensing a 1,3-propanediol reactant selected from the group consisting of 1,3-propanediol and/or oligomers or prepolymers of 1,3-propanediol having a degree of polymerization of 2-9 and mixtures thereof using a polycondensation catalyst to form a polytrimethylene ether glycol at less than one atmosphere pressure. In addition, polytrimethylene ether glycol has a number average molecular weight greater than 1,500, an APHA color of less than 120, an unsaturation of less than 20 meq/kg, and a content of cyclic ether oligomers of less than 2 %.

L'invention concerne un procédé de fabrication de polytriméthylène éther glycol qui consiste à polycondenser un réactif 1,3-propanédiol choisi dans le groupe formé de 1,3-propanédiol et/ou d'oligomères ou de prépolymères de 1,3-propanédiol ayant un degré de polymérisation de 2-9 et de leurs mélanges à l'aide d'un catalyseur de polycondensation pour former un polytriméthylène éther glycol à une pression inférieure à une atmosphère. En outre, le polytriméthylène éther glycol présente un poids moléculaire moyen supérieur à 1 500, un indice de couleur APHA inférieur à 120, une insaturation inférieure à 20 meq/kg et une teneur en oligomères éther cycliques inférieure à 2 %.

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