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An aqueous dispersion type fluorine-containing water- and oil-repellent composition containing a polymer of a perfluoroalkyl group-containing ethylenically unsaturated monomer dispersed in an aqueous medium. The composition also contains a nonionic surfactant having an HLB value of at most 11 and a

An aqueous dispersion type fluorine-containing water- and oil-repellent composition containing a polymer of a perfluoroalkyl group-containing ethylenically unsaturated monomer dispersed in an aqueous medium. The composition also contains a nonionic surfactant having an HLB value of at most 11 and a cationic surfactant. A homopolymer of at least one monomer constituting the polymer has Tg of at most 50° C.

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The invention claimed is: 1. 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 mono

The invention claimed is: 1. 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-R1—OOCC(R2)═CH2 wherein Rf is a linear or branched perfluoroalkyl group having 6 to 14 carbon atoms; R1 is a linear or branched alkylene group having 1 to 20 carbon atoms; and R2 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. 2. The composition according to claim 1, wherein the nonionic surfactant has an HLB value of at most 9. 3. The composition according to claim 2, wherein the composition contains a nonionic surfactant having an HLB value of 9 to 13 in addition to the nonionic surfactant having an HLB value of at most 9. 4. The composition according to claim 3, wherein the amount of the nonionic surfactant having an HLB value of at most 9 is at least 60% by weight, based on the total of the nonionic surfactant. 5. The composition according to claim 1, wherein the amount of the nonionic surfactant is from 0.1 to 100 parts by weight, based on 100 parts by weight of the polymer. 6. The composition according to claim 1, wherein R1 is a —CH2CH2— group. 7. 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 wherein the at least one fluorine-free monomer constituting the polymer is at least one selected from the group consisting of C2-C14 alkyl (meth)acrylates, vinyl chloride (VCl), vinylidene chloride (VdCl), butadiene and chloroprene, 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—R1—OOCC(R2)═CH2 wherein Rf is a linear or branched perfluoroalkyl group having 6 to 14 carbon atoms; R1 is a linear or branched alkylene group having 1 to 20 carbon atoms; and R2 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. 8. The composition according to claim 7, wherein R1 is a —CH2CH2— group. 9. A method of producing the aqueous dispersion type fluorine-containing water- and oil-repellent composition according to claim 1, wherein a monomer is polymerized in the presence of both the nonionic surfactant having an HLB value of at most 11 and the cationic surfactant by an emulsion polymerization process to give the polymer. 10. A method of producing 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 method comprises polymerizing the perfluoroalkyl group-containing ethylenically unsaturated monomer in the presence of the cationic surfactant, and then adding the nonionic surfactant having an HLB value of at most 11, and wherein the perfluoroalkyl group-containing ethylenically unsaturated monomer is represented by the formula: Rf—R1—OOCC(R2)═CH2 wherein Rf is a linear or branched perfluoroalkyl group having 6 to 14 carbon atoms; R1 is a linear or branched alkylene group having 1 to 20 carbon atoms; and R2 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. 11. The method according to claim 10, wherein R1 is a —CH2CH2— group. 12. A treatment method comprising treating a textile with the composition according to claim 1 and then drying and/or heat-treating the textile. 13. The treatment method according to claim 12, wherein the drying and/or heat-treatment is conducted at a temperature of at most 140° C. 14. An article treated with the method according to claim 12. 15. The article according to claim 14, wherein the article is a polyolefin fiber. 16. The article according to claim 14, wherein the article is for furniture use, or for medical or sanitary use. 17. The article according to claim 14, wherein the article comprises at least one fiber selected from the group consisting of a natural fiber, a synthetic fiber, a semi-synthetic fiber, an inorganic fiber and a mixture of these fibers. 18. The article according to claim 14, wherein the article comprises at least one fiber selected from the group consisting of polypropylene fiber, polyester fiber and cotton fiber.