Patent ID: 8461254

Claim:
A surface treatment agent for use on substrates, said surface treatment agent comprising a fluorine-containing polymer comprising repeating units derived from: (A) a monomer which comprises; (a) a fluorine-containing monomer of the formula: CH 2 ═C(X)COOYRf, wherein X is a hydrogen atom, a monovalent organic group, or a halogen atom, Y is a direct bond or a divalent organic group, and Rf is a fluoroalkyl group having 1 to 21 carbon atoms, and (B) a mercapto functional organopolysiloxane; wherein said mercapto functional organopolysiloxane (B) is an amino-mercapto functional organopolysiloxane comprising siloxy units having the average formula: (R 2 SiO) a (RR N SiO) b (RR S SiO) c wherein a is 0-4000, b is 1-1000, c is 1-1000, R is independently a monovalent organic group, R N is a monovalent amino functional organic group, and R S is a monovalent mercapto functional organic group.