Patent ID: 7553985

Claim:
A composition of formula I [Rf(CH 2 )m(O)n]x-A wherein R f is a straight or branched perfluoroalkyl group having from about 2 to about 20 carbon atoms, or a mixture thereof, m is a positive integer equal to or greater than 3, n is 1, x is 1 to 2, and A is —P(O)(OR 1 ) y (OM + ) 3−y−x , M + is an alkali metal ion, NH 4 + , or NH 2 + (CH 2 CH 2 OH) 2 , R 1 is C 1 to C 3 alkyl, and R 2 is C 1 to C 4 alkyl, R 3 is H or CH 3 , y is 0 to about 1, d is 0 to about 16, e is 0 to about 16, provided that (d+e) is from about 3 to about 16.