AQUEOUS POLYTETRAFLUOROETHYLENE DISPERSION

To provide a polytetrafluoroethylene aqueous dispersion which is excellent in mechanical stability and, at the same time, is less likely to foam.A polytetrafluoroethylene aqueous dispersion characterized by comprisingfrom 15 to 70 mass% of polytetrafluoroethylene particles having an average primary particle size of from 0.1 to 0.5 µm,from 0.1 to 20,000 ppm, to the mass of the above polytetrafluoroethylene particles, of at least one fluorinated emulsifier selected from the group consisting of a Cfluorinated carboxylic acid which may have an etheric oxygen atom, and salts thereof,from 1 to 20 parts by mass, per 100 parts by mass of the above polytetrafluoroethylene particles, of a nonionic surfactant represented by R-O-A-H, wherein Ris a Calkyl group, and A is a polyoxyalkylene chain,from 0.15 to 3 parts by mass, per 100 parts by mass of the above polytetrafluoroethylene particles, of a polyether polysiloxane copolymer, andwater.