| 摘要 |
A method of providing a surface effect to a medium or substrate comprising contacting the medium or substrate with a compound of formula (I): wherein Ra is linear or branched F(CF2)n(CH2CF2)m—, or linear or branched F(CF2)r—O—B—; B is (CsF2s) optionally interrupted by 1 to 2 catenary oxygen atoms, each oxygen bonded to two carbon atoms, n is 2 to 4, m is 1 to 4, r is 1 to 4, s is 1 to 4, provided that (r+s) is a maximum of 7, A is O or (CH2)k—COO, R1 is hydrogen or a methyl, R2 and R3 are each independently alkyl having 1 to 6 carbon atoms, and p, q and k are each independently integers from 1 to 10. |
