Liquid fluoropolymer composition and process for producing crosslinked fluorochemical

摘要

It is an object of the present invention to provide a liquid composition which comprises an acid/acid salt group-containing polymer and from which cured articles excellent in mechanical characteristics and undergoing only slight dimensional changes depending on the moisture content can be produced by application thereof to a substrate or impregnation of a porous material therewith. The present invention relates to a fluoropolymer liquid composition comprising a fluoropolymer liquid (A) which comprises a liquid medium and a crosslinkable functional group-containing crosslinkable fluoropolymer, wherein said fluoropolymer liquid (A) is a fluoropolymer liquid dispersion (AD) having, dispersed in a liquid dispersion medium, particles of a crosslinkable fluoropolymer (PD) containing acid/acid salt groups or organic groups capable of undergoing hydrolysis and thus being converted to carboxyl groups, or a fluoropolymer solution (AS) having, dissolved in a fluorosolvent or an alcohol/water mixed solvent, a crosslinkable fluoropolymer (PS) containing acid/acid salt groups or acid/acid salt groups precursors; said acid/acid salt groups are sulfonic acid groups, carboxyl groups or groups of the formula -SO₂NR²R³, -SO₃NR⁴R⁵R⁶R⁷, -SO₃M¹_1/L, -COONR⁸R⁹R¹⁰R¹¹ or -COOM²_1/L, wherein R² represents a hydrogen atom or M⁵_1/L, R³ represents an alkyl group or an sulfonyl-containing group, R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰ and R¹¹ are the same or different and each represents a hydrogen atom or an alkyl group, and M¹, M² and M⁵ each represents a metal having a valence of L, said metal having a valence of L being a metal belonging to the group 1, 2, 4, 8, 11, 12 or 13 of the periodic table; and said acid/acid salt groups precursors are -SO₂F, -SO₂NR²²R²³ (wherein R²² and R²³ are the same or different and each represents an alkyl group) or organic groups capable of undergoing hydrolysis and thus being converted to carboxyl groups.