A flame-retardant fabric may include a cellulosic fiber and a modacrylic fiber, the cellulosic fiber being a natural cellulose fiber containing a phosphorus compound, the modacrylic fiber containing an antimony compound, the flame-retardant fabric including the modacrylic fiber containing the antimony compound in an amount of 14 to 54 wt %, antimony in an amount of not less than 1.7 wt %, and phosphorus in an amount of 0.3 to 1.5 wt % with respect to the total weight of the flame-retardant fabric, and the flame-retardant fabric having a weight per unit area of not less than 160 g/m.sup.2. The flame-retardant fabric can be produced by subjecting a fabric including a natural cellulose fiber and a modacrylic fiber containing an antimony compound to flame-retardant treatment with a phosphorus compound.

A flame-retardant fabric may include a cellulosic fiber and a modacrylic fiber, the cellulosic fiber being a natural cellulose fiber containing a phosphorus compound, the modacrylic fiber containing an antimony compound, the flame-retardant fabric including the modacrylic fiber containing the antimony compound in an amount of 14 to 54 wt %, antimony in an amount of not less than 1.7 wt %, and phosphorus in an amount of 0.3 to 1.5 wt % with respect to the total weight of the flame-retardant fabric, and the flame-retardant fabric having a weight per unit area of not less than 160 g/m.sup.2. The flame-retardant fabric can be produced by subjecting a fabric including a natural cellulose fiber and a modacrylic fiber containing an antimony compound to flame-retardant treatment with a phosphorus compound.

The present invention relates to a flame-retarding agent comprising a phosphoramidate compound represented by Formula (I): ##STR00001##
wherein R.sub.1 and R.sub.2 are each independently C.sub.1-3 alkyl, R.sub.11 and R.sub.12 are each independently C.sub.1-3 alkylene, R.sub.13 is C.sub.1-6 alkylene, B.sub.1 is hydrogen or C.sub.1-6 alkyl, and A is hydrogen or an organic group represented by Formula (Ia): ##STR00002##
wherein R.sub.3 and R.sub.4 are each independently C.sub.1-3 alkyl, R.sub.14 and R.sub.15 are each independently C.sub.1-3 alkylene, and B.sub.2 is hydrogen or C.sub.1-6 alkyl,
wherein when B.sub.1 is C.sub.1-6 alkyl, and A is hydrogen, B.sub.1 and R.sub.13-A, taken together with nitrogen to which they are attached, may form a non-aromatic nitrogen-containing heterocycle, and
wherein when B.sub.1 is C.sub.1-6 alkyl, A is an organic group represented by Formula (Ia), and B.sub.2 is C.sub.1-6 alkyl, B.sub.1 and B.sub.2, taken together with nitrogen to which they are attached and with R.sub.13, may form a non-aromatic nitrogen-containing heterocycle.

The present invention relates to a flame-retarding agent comprising a phosphoramidate compound represented by Formula (I): ##STR00001##
wherein R.sub.1 and R.sub.2 are each independently C.sub.1-3 alkyl, R.sub.11 and R.sub.12 are each independently C.sub.1-3 alkylene, R.sub.13 is C.sub.1-6 alkylene, B.sub.1 is hydrogen or C.sub.1-6 alkyl, and A is hydrogen or an organic group represented by Formula (Ia): ##STR00002##
wherein R.sub.3 and R.sub.4 are each independently C.sub.1-3 alkyl, R.sub.14 and R.sub.15 are each independently C.sub.1-3 alkylene, and B.sub.2 is hydrogen or C.sub.1-6 alkyl,
wherein when B.sub.1 is C.sub.1-6 alkyl, and A is hydrogen, B.sub.1 and R.sub.13-A, taken together with nitrogen to which they are attached, may form a non-aromatic nitrogen-containing heterocycle, and
wherein when B.sub.1 is C.sub.1-6 alkyl, A is an organic group represented by Formula (Ia), and B.sub.2 is C.sub.1-6 alkyl, B.sub.1 and B.sub.2, taken together with nitrogen to which they are attached and with R.sub.13, may form a non-aromatic nitrogen-containing heterocycle.