Patent attributes
A surfactant of formula 1(Rf-A)a-Q-([B]k—R)b Formula 1whereina and b are each independently 1 or 2;Rf 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 C1 to C20 linear, branched or cyclic alkyl, or a C6 to C10 aryl;B is —(CH2CHR1O)x—,k is 0 or 1, x is 1 to about 20,A is —(CH2)m[(CHR1CH2O)]s—[(CH2)m(CH)tCHOH(CH2)m]e—,whereineach m is independently 0 to 3, s is 0 to about 30, t is 0 or 1, and e is 0 or 1,R1 is H or CH3,Q is:—OP(O)(O−M+)(O)—,—O—,—S—(CH2)m—C(O)—O—,—SO2—O——CH2CH2O—C(O)CH2C(OH)(V)CH2C(O)O—;—(CH2CH2O)xCH2CH(OH)—(CH2CH2O)x—(CH2)m—Si[OSi(R2)3]2—, —SO2NR2—,—(CH2CH2O)zC(O)CH(SO3−M+)CH2C(O)(OCH2CH2)z—wherein z is 1 to about 15, ora bond when s is a positive integer,V is —C(O)OR3 and R3 is H, CH3 or Rf;R2 is C1 to C4 alkyl, andM+ is a Group 1 metal or an ammonium (NHxR2y)+ cation wherein x+y=4, and R2 is C1 to C4 alkyl,provided that when Q is —OP(O)(O−M+)(O)— or when Q is —(CH2CH2O)z—C(O)CH(SO3−M+)CH2C(O)(OCH2CH2)z—, then at least one of s or e is a positive integer.
