Residue reduction in perfluoroalkoxy alkane (PFA) dispersions
WO2025189061A8 Publication Date: 2025-10-02THE CHEMOURS CO FC LLC
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Patent Information
- Application Number
- PCT/US2025/018847
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-08
- Filing Date
- 2025-03-07
- Publication Date
- 2025-10-02
AI Technical Summary
Technical Problem
Existing fluoropolymer dispersions contain significant levels of nonionic surfactants and fluorinated residues, including perfluoroalkyl carboxylic acids (PFCAs), which are subject to regulatory control and environmental concerns, and current methods are inefficient in reducing these contaminants.
Method used
A process involving polymerization in an aqueous medium with a nucleant to achieve small particle sizes, followed by modification with a nonionic surfactant and treatment with an ion exchange resin to reduce linear C9-C14 perfluoroalkyl carboxylic acids to low concentrations.
Benefits of technology
The process effectively reduces linear C9-C14 perfluoroalkyl carboxylic acids to parts-per-billion levels, enhancing environmental compliance and manufacturing efficiency.
✦ Generated by Eureka AI based on patent content.
Abstract
A process includes contacting a perfluoroalkoxy alkane (PFA) dispersion having a first cumulative concentration of linear C9-C14 perfluoroalkyl carboxylic acids to an ion exchange resin to remove at least 95% of the linear C9-C14 perfluoroalkyl carboxylic acids from the PFA dispersion. A PFA dispersion includes particles of perfluoroalkoxy alkane dispersed in an aqueous liquid. The particles have a raw dispersion particle size of less than 180 nm. The PFA dispersion has a solids content of at least 20 wt% and a total concentration of linear C9-C14 perfluoroalkyl carboxylic acids of about 500 parts-per-billion or less.
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