Patent ID: 7709563

Claim:
An aqueous dispersion type fluorine-containing water- and oil-repellent composition comprising a polymer of a perfluoroalkyl group-containing ethylenically unsaturated monomer in an amount of 50 to 90% by weight, based on the polymer, and at least one fluorine-free monomer dispersed in an aqueous medium, wherein the composition contains a nonionic surfactant having an HLB value of at most 11 and a cationic surfactant, and a homopolymer of the at least one fluorine-free monomer constituting the polymer has a glass transition temperature (Tg) of at most 50° C., wherein the cationic surfactant is at least one selected from the group consisting of monoalkyl trimethyl ammonium salts and dialkyl dimethyl ammonium salts, and wherein the perfluoroalkyl group-containing ethylenically unsaturated monomer is represented by the formula: Rf-R 1 —OOCC(R 2 )═CH 2 wherein Rf is a linear or branched perfluoroalkyl group having 6 to 14 carbon atoms; R 1 is a linear or branched alkylene group having 1 to 20 carbon atoms; and R 2 is a hydrogen atom or a methyl group, wherein the nonionic surfactant is at least one selected from the group consisting of polyoxyalkylenedialkyl esters, polyoxyalkylenealkyl esters and polyoxyalkylenealkyl ethers, and wherein all of the cationic surfactant contained in the composition is a fluorine-free surfactant.