Patent ID: 8338518
Filing Date: 2012-12-25
Classification: C08F,C08K,C08L

Abstract:
1. An aqueous stable thermoplastic fluoropolymer dispersion comprising: a) a fluoropolymer containing from 70 to 100 mole percent of vinylidene fluoride monomer units, and containing residues of one or more ammonium or alkali metal salts of persulfates; and b) as the only surfactant from 100 ppm to 2 percent, based on the weight of the fluoropolymer solids, of total emulsifier(s) consisting of nonionic emulsifiers consisting of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol (PTMG) segments with repeating units of from 2 to 100, wherein said fluoropolymer is in the form of particles having an average particle size from 50 to 500 nm and said fluoropolymer dispersion has a solid content of 15 to 70 weight percent, and wherein said fluoropolymer dispersion is free of fluorinated-surfactant.