Patent ID: 7709566

Claim:
A polytetrafluoroethylene aqueous dispersion comprising from 15 to 70 mass % of polytetrafluoroethylene fine particles having an average particle size of from 0.1 to 0.5 μm, from 1×10 −5 to 0.5 mass %, based on the mass of the polytetrafluoroethylene, of a fluorinated emulsifier of the formula (1): XCF 2 CF 2 (O) m CF 2 CF 2 OCF 2 COOA Formula (1) wherein X is a hydrogen atom or a fluorine atom, A is a hydrogen atom, an alkali metal or NH 4 , and m is an integer of 0 or 1, and from 1 to 20 mass %, based on the mass of the polytetrafluoroethylene, of a nonionic surfactant.