Simultaneously dyeing and flame-retardant finishing method for polyester based textile

A method for simultaneously dyeing and flame-retardant finishing a polyester-based fiber product, the method comprising immersing and heating a polyester-based fiber product in a processing bath containing (A) at least one yellow disperse dye selected from yellow disperse dyes represented by Formulae (I) to (IV) below and (B) a phosphoramidate represented by Formula (V) below:

• (A)(1) a yellow disperse dye represented by Formula (I) below:
• (2) a yellow disperse dye represented by Formula (II) below:
• (3) a yellow disperse dye represented by Formula (III) below:
• (4) a yellow disperse dye represented by Formula (IV) below:
• (B) a phosphoramidate represented by Formula (V) below:
• wherein the processing bath is characterized by the following properties:
• a color difference ΔE(100° C.) between a dyed fabric obtained by dyeing a subject fabric at 100° C. with the yellow disperse dye in the absence of the phosphoramidate represented by Formula (V), and a dyed fabric obtained by dyeing a subject fabric at 100° C. with the yellow disperse dye in the presence of the phosphoramidate represented by Formula (V) is less than 5,
• a color difference ΔE(130° C.) between a dyed fabric obtained by dyeing a subject fabric at 130° C. with the yellow disperse dye in the absence of the phosphoramidate represented by Formula (V), and a dyed fabric obtained by dyeing a subject fabric at 130° C. with the yellow disperse dye in the presence of the phosphoramidate represented by Formula (V) is less than 5, and
• a dyeing-rate change rate obtained by the following formula is in a range of 100 to 120:
• (ΔE(dye)/ΔE(dye+flame retardant))×100,
• wherein ΔE(dye) is a color difference between the dyed fabric obtained by dyeing the subject fabric at 100° C. with the yellow disperse dye in the absence of the phosphoramidate represented by Formula (V), and the dyed fabric obtained by dyeing the subject fabric at 130° C. with the yellow disperse dye in the absence of the phosphoramidate represented by Formula (V);
• and
• ΔE(dye+flame retardant) is a color difference between the dyed fabric obtained by dyeing the subject fabric at 100° C. with the yellow disperse dye in the presence of the phosphoramidate represented by Formula (V), and the dyed fabric obtained by dyeing the subject fabric at 130° C. with the yellow disperse dye in the presence of the phosphoramidate represented by Formula (V),
• wherein the processing bath contains at least one of the yellow disperse dyes represented by Formulae (I) to (IV) at a concentration in a range of 0.05 to 10% owf, and contains the phosphoramidate at a concentration in a range of 0.5 to 10% owf,
• wherein all of the at least one of the yellow disperse dyes represented by Formulae (I) to (IV) and the phosphoramidate have an average particle size in a range of 0.2 to 2.0 μm,
• wherein the polyester-based fiber product includes a polyester fiber that is made of one selected from the group consisting of polyethylene terephthalate;
• poly(ethylene terephthalate-co-5-sulfoisophthalate);
• poly(ethylene terephthalate-co-oxybenzoyl);
• and poly(butylene terephthalate-co-isophthalate).