Patent · US Active

Recovery of branched fluorinated emulsifiers

US9694333B2 · kind B2 · utility

1Cited by

5References

13Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

Klaus Hintzer · Woodbury, US
Egon Obermaier · Taubenbach, DE
Arne Thaler · Emmerting, DE

Key dates

Filing date	Apr 15, 2015
Grant date	Jul 4, 2017
Priority date	—
Expiry date	Apr 15, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/47
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

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.

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