Process for reducing the amount of fluorinated surfactant in...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 6/16 (2006.01) C08L 27/12 (2006.01)

Patent

CA 2484299

The present invention provides a process of reducing the amount of fluorinated emulsifier in an aqueous fluoropolymer dispersion by contacting the aqueous fluoropolymer dispersion with an anion exchange resin in a non fixed resin bed, the process comprising: (a) mixing the aqueous fluoropolymer dispersion with an effective amount of a surfactant so as to stabilize the fluoropolymer dispersion while being contacted with the anion exchange resin; (b) contacting the aqueous fluoropolymer dispersion with an anion exchange resin by agitating the aqueous fluoropolymer dispersion with an effective amount of anion exchange resin to reduce the amount of fluorinated emulsifier in the aqueous fluoropolymer dispersion to a desired level; and (c) separating the anion exchange resin from the aqueous fluoropolymer dispersion.

La présente invention concerne une méthode qui permet de réduire la quantité d'un émulsifiant fluoré dans une dispersion aqueuse de polymères fluorés, en plaçant ladite dispersion au contact d'une résine échangeuse d'ions, dans un lit de résine non fixé. La méthode consiste à: a) mélanger la dispersion aqueuse de polymères fluorés avec une quantité efficace d'un tensioactif, afin de stabiliser la dispersion aqueuse pendant qu'elle est en contact avec la résine échangeuse d'ions; b) placer la dispersion aqueuse de polymères fluorés au contact d'une résine échangeuse d'ions en brassant la dispersion aqueuse avec une quantité efficace d'une résine échangeuse d'ions, afin de réduire la quantité d'émulsifiant fluoré dans la dispersion aqueuse à un niveau désiré; et c) séparer la résine échangeuse d'ions de la dispersion aqueuse de polymères fluorés.

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