PROCESS FOR REMOVING FLUORINATED EMULSIFIER FROM FLUOROPOLMER DISPERSIONS USING AN ANION-EXCHANGE RESIN AND A pH-DEPENDENT SURFACTANT AND FLUOROPOLYMER DISPERSIONS CONTAINING A pH-DEPENDENT SURFACTANT

a technology of fluoropolymer and anion exchange resin, which is applied in the direction of water/sewage treatment by ion exchange, chemical/physical processes, separation processes, etc., can solve the problems of poor biodegradability of fluorinated emulsifiers, poor dispersion, and high cost of fluorinated emulsifiers, so as to reduce the amount of fluorinated emulsifiers and stabilize the dispersion
US20080264864A1Inactive Publication Date: 2008-10-303M INNOVATIVE PROPERTIES CO
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Patent Information

Authority / Receiving Office
US ¡ United States
Patent Type
Applications(United States)
Current Assignee / Owner
3M INNOVATIVE PROPERTIES CO
Publication Date
2008-10-30
Estimated Expiration
Not applicable ¡ inactive patent

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Abstract

A process of reducing the amount of fluorinated emulsifiers in fluoropolymer dispersions by contacting the fluoropolymer dispersion with an anion exchange resin in the presence of a pH-dependent surfactant, and fluoropolymer dispersions containing the pH-dependent surfactant and uses thereof.
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Description

[0001] The present invention relates to a process of reducing the amount of fluorinated emulsifier in fluoropolymer dispersions using anion exchange resins in the presence of one or more pH-dependent surfactants. The invention also relates to fluoropolymer dispersions containing the pH-dependent surfactants but containing no or only low amounts of fluorinated emulsifiers, and to uses of these dispersions.BACKGROUND

[0002] Fluoropolymers, i.e. polymers having a fluorinated backbone, have been long known and used in a various applications because of their desirable properties such as heat resistance, chemical resistance, weatherability, UV-stability etc. Various fluoropolymers are for example described in “Modern Fluoropolymers”, edited by John Scheirs (ed), Wiley Science 1997. The fluoropolymers may have a partially fluorinated backbone, generally at least 40% by weight fluorinated, or a fully fluorinated backbone. Particular examples of fluoropolymers include polytetrafluoroethylene (P...

Claims

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