Patent ID: 7425352

Claim:
A method for flame-retardant treatment of a polyester-based fiber product, comprising applying the polyester-based fiber product with a flame-retardant treating agent obtained by mixing a diaryl aminophosphate represented by formula (II): wherein Ar 1 and Ar 2 independently denote an aryl group of 6-18 carbon atoms which may have one to three lower alkyl groups of 1-4 carbon atoms, R 1 , R 2 and nitrogen are combined to form an anilino group, with water together with at least one surfactant selected from the group consisting of nonionic surfactants and anionic surfactants, and then milling the diaryl aminophosphate into fine particles having particle diameter in the range of 0.3 to 3 μm, so that the polyester-based fiber product has the diaryl aminophosphate attached thereto in an amount of 0.5 to 2.8% by weight based on the polyester-based fiber product.