主权项 |
1. A composition comprising a surfactant having the formula wherein Rf is CF3(CF2)n or CHF2(CF2)n, wherein n is 3-5; A is a linker selected from the group consisting of —CH2CH2—, —CH2CH2—S—, —CH2CH2—O—, —CH2CH2—CO—NH—, —CH2CH2—NH—CO— —SO2NH—, —NHSO2—, —OC(O)—, —C(O)O—, —S(O)—, and —SO2—; X is selected from the group consisting of —S—, —O—, —SO2—, —NR—, —CO2—, —CONR—, —SO2NR—, —OP(O)(OR)O—, S(O), —OC(O)—, —NRC(O)—, and —NRSO2—; Y is selected from the group consisting of —CONHR, CO2H, —CO2R, —OC(O)R, and —C6H4SO3M; R is H or C1-C6 alkyl; R′ is H or C1-C6 alkyl; M is a metal ion; and m is 2-8 and p is 2-100, and wherein said composition is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms. |