Method for purification of aqueous fluoropolymer emulsions, purified emulsions, and fluorine-containing finished articles
US7468403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2003 |
| Grant date | Dec 23, 2008 |
| Priority date | — |
| Expiry date | Oct 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.