Patent ID: 8835547

Claim:
Particles comprising a bulk of fluoropolymer and a nucleus of fluorinated ionomer, said fluoropolymer being nonionomeric fluoropolymer having no measureable ionic groups, or a limited number of ionic groups providing an ion exchange ratio of greater than about 53, and selected from the group consisting of polytetrafluoroethylene, modified polytetrafluoroethylene having a comonomer content of no greater than about 1 wt %, and melt-processible copolymer comprising at least about 60-98wt % tetrafluoroethylene units and about 2-40wt % of at least one other monomer, said melt-processible copolymer having a melt viscosity of least 10 2 Pa·s measured at 372° C., said fluorinated ionomer being solid at room temperature and having sufficient ionic groups to provide an ion exchange ratio of no greater than about 53.