| abstract |
The present invention provides a surfactant having a formula selected from the group consisting of: B—((X) x —(CH 2 ) a -M n (VI), (A-(CH 2 )—(X) x —B—(X) x —(CH 2 ) a -A) n (IV), (A-(CH 2 ) a —(X) x —B) n (V), and (B) n —(X) x —(CH 2 ) a —A (VII), wherein A is a perfluoropolyether; a is a positive integer; X is either a covalent bond or a linking group; x is a positive integer; B is a polyalkylene oxide unit; n is a positive integer greater than 1 and, in compounds comprising more than one A, B, X, a and x, each may be the same or different. The present invention also relates to methods of making such surfactants, uses of such surfactants and emulsions comprising such surfactants. |