Patent ID: 7820745

Claim:
An aqueous water- and oil-repellent composition comprising: (A) a fluorine-containing copolymer which comprises: (a1) a polymerizable monomer of the formula: Rf—R 2 —OCOCR 3 ═CH 2 , wherein Rf is a C 1 to C 6 perfluoroalkyl group or perfluoroalkenyl group, R 2 is a C 1 to C 10 alkylene group, and R 3 is a halogen, (a2) a polymerizable monomer which is copolymerizable with the monomer (a1) wherein a homopolymer of the polymerizable monomer (a2) has a glass transition temperature (Tg) of at least 50° C. and/or a melting point (Tm) of at least 30° C., and if necessary, (a3) a polymerizable monomer containing a polar group or a reactive group, the amount of the polymerizable monomer (a1) is at least 20% by weight based on the copolymer; (B) a surfactant which comprises: (b1) a nonionic surfactant which is a sorbitan ester and/or an alkylene oxide adduct thereof; and (C) an aqueous medium which is water alone or a mixture of water and an organic solvent.