Patent ID: 8519072
Filing Date: 2013-08-27
Classification: C08F,C08K,C08L

Abstract:
1. A process for polymerizing fluoropolymer comprising: dispersing fluoropolyether acid or salt and fluorosurfactant in an aqueous medium to form an aqueous polymerization agent concentrate comprising dispersed fluoropolyether acid or salt and fluorosurfactant, said fluoropolyether acid or salt having a number average molecular weight of at least about 800 g/mol, said fluorosurfactant having the formula: wherein: said aqueous polymerization agent concentrate adjusted to contain 1500 ppm±100 ppm dispersed fluoropolyether acid or salt having a haze of less than about 10%; adding said aqueous polymerization agent concentrate to an aqueous polymerization medium to provide dispersed fluoropolyether acid or salt and fluorosurfactant in said medium; and polymerizing at least one fluorinated monomer in said aqueous polymerization medium in the presence of initiator and said dispersed fluoropolyether acid or salt and said fluorosurfactant to form an aqueous dispersion of particles of fluoropolymer.