Patent ID: 7560506

Claim:
An aqueous water- and oil-repellent composition comprising: (A) a fluorine-containing copolymer which comprises: (a1) a polymerizable monomer which contains a polyfluoroalkyl or polyfluoroalkenyl group having 1 to 6 carbon atoms, (a2) a polymerizable monomer copolymerizable with the monomer (a1), and if necessary, in addition to the polymerizable monomers (a1) and (a2), (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 having an HLB of at most 12, and (b2) a nonionic surfactant having an HLB of at least 15, (C) an aqueous medium (C) which essentially consists of water, wherein the polymerizable monomer (a2) constituting the fluorine-containing copolymer (A) is such polymerizable monomer that a homopolymer of the polymerizable monomer (a2) has a glass transition temperature (Tg) of at least 55° C., and/or a melting point (Tm) of at least 30° C.