PVDF Resins for Membranes and Batteries

Arkema’s new high molecular weight Kynar® PVDF resins are ideal for solution-based products like cast membranes, hollow fiber membranes, and binders for lithium- ion battery manufacture.

The new Kynar resins have 3 to 15 times higher solution viscosities in n-methylpyrrolidone (NMP) than the Kynar resins currently used for these applications. In membranes, this increased viscosity allows for better hollow fiber casting and better membrane film formation. The high molecular weight translates into higher temperature resistance, improved physical toughness and increased chemical resistance. For lithium-ion battery applications, these resins improve productivity via quicker solubility, better electrode adhesion, and reduced use of electrode binders. Additionally, emulsion Kynar resins offer improved stress crack resistance in chemical applications.

The new high molecular weight Kynar resins are available as free-flowing powders and allow easy preparation of PVDF solutions. The Kynar-based fluoropolymer solutions are compatible with a variety of additives and co-solvents frequently used for solution cast membranes. Typical solvents used with these new resins are (but are not limited to) n-methylpyrrolidone (NMP), dimethylacetamide (DMA), and dimethylformamide (DMF).

Contact David Seiler, Arkema Inc., 2000 Market Street, Philadelphia, PA 19103, phone: (215) 419-7396, fax: (215) 419-7497, or visit www.kynar.com.