Patent ID: 6939580

Claim:
A method of preparing a treated textile, comprising steps of: (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 is an emulsion comprising a fluorine-containing compound and an emulsifier, the fluorine-containing compound is a fluorine-containing polymer and/or a fluorine-containing low molecular weight compound, and the emulsifier comprises an anionic surface active agent having pKa of at least 2, wherein the anionic surface active agent is a metal salt prepared from an acid ester of a monovalent organic alcohol and an inorganic acid.