Patent Number: 7,612,139

Title: Core/shell fluoropolymer dispersions with low fluorosurfactant content

Abstract: A stabilized aqueous fluoropolymer dispersion comprising: about 30 to about 70 weight % non-melt-processible fluoropolymer particles having an SSG of less than about 2.225, said fluoropolymer particles comprising a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene; and about 2 to about 11 weight % of aliphatic alcohol ethoxylate nonionic surfactant based on the weight of said fluoropolymer, wherein said dispersion is essentially free of surfactants containing aromatic groups and contains less than 300 ppm of fluorosurfactant based on the weight of said dispersion.

Inventors: Jones; Clay Woodward (Washington, WV), Johnson; David William (Washington, WV)

Assignee: E.I. du Pont de Nemours and Company

International Classification: C08L 27/12 (20060101)

Expiration Date: 1/03/02017