3m Innovative Properties Company

Egon Obermaier

Klaus Hintzer

Harald Kaspar

Werner Schwertfeger

Arne Thaler

Andreas R Maurer

Michael C Dadalas

Gernot Löhr

Tilman C Zipples

Astrid Weber

Stephan Führer

Provided are processes for upconcentrating fluoropolymer dispersions. Also provided are upconcentrated dispersions and substrates coated with such dispersions.

Method for reducing fluorinated emulsifiers from aqueous fluoropolymer dispersions using sugar-based emulsifiers

Described herein is a process for recovering a branched, ether-containing fluorinated emulsifier from an anion exchange resin by (1) contacting the anion exchange resin with a recovery fluid to form an eluate, the recovery fluid comprising an ammonium salt, water, and a water-miscible solvent, wherein the fluorinated emulsifier is of the formula: [Rf-(0-R'f)n-0-CF(CF3)-C(0)0-]i M+1; and (2) separating the anion exchange resin from the eluate.

Recovery of branched fluorinated emulsifiers

Provided are fluorinated oxy-carboxylic acids, derivatives of oxy-carboxylic acids, and methods of preparing oxy-carboxylic acids and derivatives thereof.

Fluorinated oxy-carboxylic acids, derivatives, and methods of preparation

The invention provides a method for recovery of a fluorinated anionic surfactant from a basic anion exchange resin having quaternary ammonium groups, the method comprising eluting the anion exchange resin with a composition comprising an ammonium salt and a water miscible organic solvent. The method according to the invention may provide one or more of the following advantages. For example, the method can be designed to allow for recovery of substantially all of the fluorinated surfactant from a basic anion exchange resin having quaternary ammonium groups. Also, the liquid used for recovering the surfactant from the anion exchange resin is a simple liquid that can be readily and cost effectively manufactured. Further the process may be carried out in a convenient and easy manner. Furthermore, the method generally does not require large amounts of the eluting composition.

Recovery of fluorinated surfactants from a basic anion exchange resin having quaternary ammonium groups

The present invention provides a method of recovering a fluorinated acid surfactant or salt thereof from adsorbent particles to which said fluorinated acid surfactant has been adsorbed. The method comprises mixing adsorbent particles having adsorbed fluorinated acid surfactant or salt thereof with an alcohol and optionally an acid. The mixture is generally heated to cause esterification of the fluorinated acid surfactant or salt thereof with the alcohol so as to form an ester derivative of the fluorinated acid surfactant, distilling the mixture to form a distillate comprising the ester derivative, separating the ester derivative from the distillate and optionally feeding the remainder of the distillate back into the mixture.

Method of recovering fluorinated acid surfactants from adsorbent particles loaded therewith

The present invention provides a method of removing a fluorinated surfactant from waste water comprising fluoropolymer particles. The method comprises (i) adding a non-fluorinated surfactant to the waste water (ii) contacting the thus obtained waste water with adsorbent particles to adsorb at least a portion of the fluorinated surfactant to the adsorbent particles and (iii) separating the waste water and the adsorbent particles.

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Taubenbach, Germany

Egon Obermaier