US Patent 7717963 Water- and oil-repellent treatment of textile

Excellent water repellency and Oil repellency are imparted to a textile by a method including(1) preparing a treatment liquid comprising a water- and oil-repellent agent,(2) adjusting pH of the treatment liquid to at most 7,(3) applying the treatment liquid to a textile,(4) treating the textile with steam, and(5) washing the textile with water and dehydrating the textile, wherein the water- and oil-repellent agent comprises at least one fluorine-containing compound selected from the group consisting of a fluorine-containing polymer and a fluorine-containing low molecular weight compound, and the water- and oil-repellent agent or the treatment liquid contains a cationic emulsifier and/or a salt.