| 主权项 |
1. A process for the purification from ionic impurities of a fluoroionomer liquid composition, said process comprising:
contacting a liquid composition, said liquid composition comprising at least one fluoroionomer (I-1) and ionic impurities in a liquid medium, with a solid particulate comprising at least one fluoroionomer (I-2) having ion exchange groups, wherein H+ or OH− ions are bound to at least a fraction of said ion exchange groups; and separating said liquid composition from said solid particulate, wherein fluoroionomer (I-1) and fluoroionomer (I-2) are selected from fluoroionomers (I) comprising recurring units derived from at least one fluorinated functional monomer selected from: sulfonated perfluoroolefins of formula (M1):wherein n is an integer between 0 and 6; and X′ is selected from the group consisting of Cl, F, Br, I and —O−M+, wherein M+ is a cation selected from the group consisting of H+, NH4+, K+, Li+, Na+, and mixtures thereof;
sulfonated perfluorovinylethers of formula (M2):wherein m is an integer between 1 and 10; and X′ is selected from the group consisting of Cl, F, Br, I and —O−M+, wherein M+ is a cation selected from the group consisting of H+, NH4+, K+, Li+, Na+, and mixtures thereof;
sulfonated perfluoroalkoxyvinylethers of formula (M3):wherein w is an integer between 0 and 2, RF1 and RF2, equal or different from each other and at each occurrence, are independently —F, —Cl or a C1-10 perfluoroalkyl group, y is an integer between 0 and 6; and X′ is selected from the group consisting of Cl, F, Br, I and —O−M+, wherein M+ is a cation selected from the group consisting of H+, NH4+, K+, Li+, Na+, and mixtures thereof;
sulfonated aromatic (per)fluoroolefins of formula (M5):wherein Ar is a C3-15 aromatic or heteroaromatic moiety and X′ is selected from the group consisting of Cl, F, Br, I and —O−M+, wherein M is a cation selected from the group consisting of H+, NH4+, K+, Li+, Na+, and mixtures thereof; and
(M6) mixtures thereof. |
