Patent Number: 6,841,594

Title: Core-shell fluoropolymer dispersions

Abstract: A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5.times.10.sup.10 Pa.multidot.s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9.times.10.sup.9 Pa.multidot.s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.

Inventors: Jones; Clay Woodward (Washington, WV), Krakowiak; Walter Thomas (Wilmington, DE)

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

International Classification: C08F 259/00 (20060101); C08F 259/08 (20060101); C08L 51/00 (20060101); C09D 151/00 (20060101); C08L 083/00 (); C08L 027/12 ()

Expiration Date: 01/11/2022