Method of making an aqueous dispersion of fluoropolymers

Details Method of making an aqueous dispersion of fluoropolymers Method of making an aqueous dispersion of fluoropolymers

C - Chemistry, Metallurgy

08

J

C08J 3/03 (2006.01) C08F 6/16 (2006.01) C08L 27/12 (2006.01)

Patent

CA 2403957

The invention provides a process for removing steam-volatile fluorinated emulsifiers in their free acid form, from aqueous fluoropolymer dispersions. The process comprises adding a nonionic emulsifier to the aqueous fluoropolymer dispersion and, at a pH-value of the aqueous fluoropolymer dispersion below 5, removing steam-volatile fluorinated emulsifier by distillation until the concentration of steam-volatile fluorinated emulsifier in the dispersion reaches the desired value.

L'invention concerne un procédé d'élimination d'émulsifiants fluorés volatiles à la vapeur dans leur forme acide libre, émulsifiants présents dans des dispersions aqueuses de fluoropolymères. Le procédé consiste à ajouter un émulsifiant non ionique à ladite dispersion et, à un pH inférieur à 5, à éliminer les émulsifiants fluorés volatiles à la vapeur par distillation jusqu'à ce que la concentration desdits émulsifiants atteigne la valeur souhaitée.

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