Method for solid phase polymerization

C - Chemistry – Metallurgy – 08 – G

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C08G 69/30 (2006.01)

Patent

CA 2268127

An improved method for increasing the relative viscosity and molecular weight of a polyamide polymer (such as nylon 6,6, nylon 6, and the like) while in the solid state involving the use of a phosphorus-containing catalyst (such as 2(2'-pyrydyl)ethyl phosphonic acid, sodium hypophosphite, tolyl phosphinate and manganese hypophosphite or the like) in combination with an oxygen free gas characterized by a low dew point (typically below 30 °C and preferably below -30 °C). Operational and commercial advantages are derived from the combination of using simultaneously a phosphorus-containing catalyst and the recycle of very low dew point drying gas at lower operating temperatures than previously employed in conducting solid phase polymerization of polyamide polymer. Such a process is of particular value during the production of terpolyamide and multipolyamide polymer intended for use in colored nylon fiber manufacture.

L'invention concerne un procédé amélioré destiné à augmenter la relative viscosité et le poids moléculaire d'un polymère de polyamide (tel que le nylon 6,6, le nylon 6 et similaire) à l'état solide, en utilisant un catalyseur renfermant du phosphore (tel que de l'acide 2(2'-pyrydyl)éthyle phosphonique, de l'hypophosphite de sodium, du phosphinate de totyle et de l'hypophosphite de manganèse ou similaire), combiné à un gaz exempt d'oxygène caractérisé par un faible point de rosée (généralement inférieur à 30 DEG C et de préférence inférieur à -30 DEG C). L'utilisation simultanée d'un catalyseur renfermant du phosphore et d'un recyclage de gas de séchage à faible point de rosée rend l'opération avantageuse d'un point de vue financier et permet une production plus élevée à une température inférieure. Ce procédé présente une valeur particulière pour la production de polymères terpolyamides et multipolyamides destinés à être utilisés dans la fabrication de fibres de nylon de couleur.

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