Patent ID: 7728163

Claim:
A surfactant of formula 1 (R f -A) a -Q-([B] k —R) b Formula 1 wherein a and b are each independently 1 or 2; R f is a linear or branched perfluoroalkyl radical having from 2 to about 20 carbon atoms, optionally interrupted with at least one oxygen; R is a C 1 to C 20 linear, branched or cyclic alkyl, or a C 6 to C 10 aryl; B is —(CH 2 CHR 1 O) x —, k is 0 or 1, x is 1 to 20, A is (CH 2 ) m [(CHR 1 CH 2 O)] s —[(CH 2 ) m (CH) t CHOH(CH 2 ) m ] e —, wherein each m is independently 0 to 3, s is 0 to 30, t is 0 or 1, and e is 0 or 1, R 1 is H or CH 3 , Q is: —S—(CH 2 ) m —C(O)—O—, —SO 2 —O— —CH 2 CH 2 O—C(O)CH 2 C(OH)(V)CH 2 C(O)O—; (CH 2 CH 2 O) x CH 2 CH(OH)—CH 2 O—(CH 2 CH 2 O) x —(CH 2 ) m —Si[OSi(R 2 ) 3 ] 2 —, —SO 2 NR 2 —, —(CH 2 CH 2 O) z C(O)CH(SO 3 − M + )CH 2 C(O)(OCH 2 CH 2 ) z — wherein z is 1 to 15, or a bond when s is a positive integer, V is —C(O)OR 3 and R 3 is H, CH 3 or R f ; R 2 is C 1 to C 4 alkyl, and M + is a Group 1 metal or an ammonium (NH x R 2 y ) + cation wherein x and y are each independently 0 to 4, and x+y=4, and R 2 is C 1 to C 4 alkyl, provided that when Q is —(CH 2 CH 2 O) z —C(O)CH(SO 3 − M + )CH 2 C(O)(OCH 2 CH 2 ) z —, then at least one of s or e is a positive integer.