Patent · US Expired

Method for purification of aqueous fluoropolymer emulsions, purified emulsions, and fluorine-containing finished articles

US7468403B2 · kind B2 · utility

3Cited by
9References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 6, 2003
Grant dateDec 23, 2008
Priority date
Expiry dateOct 6, 2023

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08F14/26
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

The present invention provides a method of purifying an aqueous fluoropolymer emulsion by which fluorine-containing surfactants can be removed without lowering the dispersibility of the aqueous fluoropolymer dispersions.The present invention provides a method of purifying an aqueous fluoropolymer emulsion comprising; purifying an aqueous fluoropolymer emulsion by a specific technique of concentrationwherein the aqueous fluoropolymer emulsion comprises a fluoropolymer and a fluorine-containing surfactant,said specific technique of concentration comprises concentration by phase separation, electric concentration and/or ion exchange concentration, andsaid concentration by phase separation, electric concentration and/or ion exchange concentration is carried out for removing the fluorine-containing surfactant.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.