PROCESS DECREASING AMOUNT OF FLUORO-CONTAINING SURFACTANT IN AQUEOUS FLUOROPOLYMERIC DISPERSIONS Russian patent published in 2008 - IPC C08F14/18 C08F6/16 

FIELD: chemical technology.

SUBSTANCE: invention describes a method for decreasing the amount of a fluorinated emulsifier by providing contact of aqueous fluoropolymeric dispersion with anion-exchange resin in non-fixed resin layer. Method involves steps for mixing aqueous fluoropolymeric dispersion with a surfactant for stabilization of fluoropolymeric dispersion in process for its contacting with anion-exchange resin; providing the contact of aqueous fluoropolymeric dispersion with anion-exchange resin by shaking an aqueous fluoropolymeric dispersion with anion-exchange resin for less 4 h to decline the amount fluorinated emulsifier in aqueous fluoropolymeric dispersion and to separate anion-exchange resin from aqueous fluoropolymeric dispersion. Also, invention describes the constant or periodically carried out method involving the additional step of at least a single repeated using the separated anion-exchange resin without its regeneration. Proposed methods are directed for decreasing amount of fluorinated surfactant in aqueous fluoropolymeric dispersions, in particular, the invention describes the more economy method for decreasing the content of fluorinated surfactant.

EFFECT: improved method for decreasing amount of emulsifier.

12 cl, 6 tbl, 6 ex