Patent ID: 7723417

Claim:
An aqueous composition comprising (i) a fluorochemical compound and (ii) an ester derivative of an alpha-hydroxy acid, said ester derivative being chosen from the group consisting of triethyl citrate, tributyl citrate, dibutyl malate, dibutyl tartarate, acetyl triethyl citrate, and acetyl tributyl citrate, and mixtures thereof; wherein said fluorochemical compound comprises a copolymer comprising (a) fluorinated monomer and (b) a non-fluorinated comonomer, said fluorinated monomer being selected from the group consisting of: fluorinated monomer according to the formula R f —X-L, wherein R f represents a perfluorinated aliphatic group, X represents an organic linking group and E represents an ethylenically unsaturated group; fluorinated monomer according to the formula R 1 f —X 1 —OC(O)—C(R)═CH 2 , wherein R 1 f represents a perfluorinated aliphatic group, X 1 is an organic divalent linking group, and R represents hydrogen or a lower alkyl group having 1 to 4 carbon atoms; and mixtures thereof.