Fluoropolymer dispersion and process for producing fluoropolymer dispersion

摘要

A fluoropolymer solid composition which contains a fine particle comprising a fluoropolymer, said fluoropolymer having an acid/acid salt group, said acid/acid salt group being a sulfonic acid group, -SO₂NR¹⁷R¹⁸, a carboxyl group, -SO₃NR¹R²R³R⁴, -SO₃M¹_1/L, -COONR⁵R⁶R⁷R⁸ or -COOM²_1/L (in which R¹⁷ and R¹⁸ are the same or different and each represents a hydrogen atom, an alkali metal, an alkyl group or a sulfonyl-containing group, R¹, R², R³ and R⁴ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R⁵, R⁶, R⁷ and R⁸ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, M¹ and M² are the same or different and each represents a metal whose valence is L, and said metal whose valence is L is a metal belonging to the group 1, 2, 4, 8, 11, 12 or 13 of the periodic table); said fine particle comprising the fluoropolymer containing, at the proportion of at least 25% by mass thereof, a spherical fluoropolymer fine particle, and said spherical fluoropolymer fine particle being substantially spherical.