A method of producing a liquid crystalline polyester fiber includes subjecting a yarn prepared by melt spinning a liquid crystalline polyester to a solid-phase polymerization after applying inorganic particles (A) and a phosphate-based compound (B) to the yarn. The method can optionally include cleaning the liquid crystalline polyester fiber after the solid-phase polymerization.

Method for making a cellulose-comprising, flame-resistant, textile article comprising multiple flame-retardant treatments. The method comprises: a. providing at least part of the textile article with a non-cellulose-reactive, phosphorous-containing, flame-retardant compound, and b. providing at least part of the textile article with a cellulose-reactive, phosphorous-containing, flame-retardant compound. The method is suitable for producing flame-resistant, textile articles such as flame-resistant garments. Said garments can be used to protect individuals from flames and/or heat.

Method for making a cellulose-comprising, flame-resistant, textile article comprising multiple flame-retardant treatments. The method comprises: a. providing at least part of the textile article with a non-cellulose-reactive, phosphorous-containing, flame-retardant compound, and b. providing at least part of the textile article with a cellulose-reactive, phosphorous-containing, flame-retardant compound. The method is suitable for producing flame-resistant, textile articles such as flame-resistant garments. Said garments can be used to protect individuals from flames and/or heat.

A flameproofing agent for fibers which has high flameproofness and excellent physical properties (light resistance, heat resistance, texture), a process for manufacturing a flameproof fiber product and a flameproof fiber product. The flameproofing agent comprises an organic phosphorus compound (component A) represented by the following formula (1). ##STR00001##
(In the above formula, X.sup.1 and X.sup.2 are the same or different and each an aromatic substituted alkyl group represented by the following formula (2).)
ALAr).sub.n(2)
(In the above formula, AL is a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, Ar is a phenyl group, naphthyl group or anthryl group all of which may have a substituent, n is an integer of 1 to 3, and Ar may be bonded to any carbon atom contained in AL.)

A flameproofing agent for fibers which has high flameproofness and excellent physical properties (light resistance, heat resistance, texture), a process for manufacturing a flameproof fiber product and a flameproof fiber product. The flameproofing agent comprises an organic phosphorus compound (component A) represented by the following formula (1). ##STR00001##
(In the above formula, X.sup.1 and X.sup.2 are the same or different and each an aromatic substituted alkyl group represented by the following formula (2).)
ALAr).sub.n(2)
(In the above formula, AL is a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, Ar is a phenyl group, naphthyl group or anthryl group all of which may have a substituent, n is an integer of 1 to 3, and Ar may be bonded to any carbon atom contained in AL.)

Described are flame resistant fabrics having a warp direction, a weft direction, and a fabric weight. The flame resistant fabrics may include warp direction yarns and weft direction yarns, where the warp direction yarns include warp body yarns having a fiber blend of a wt. % of non-FR synthetic fibers and at least 60 wt. % cellulosic fibers; and the weft direction yarns include weft body yarns having a fiber blend of a wt. % of non-FR synthetic fibers and at least 60 wt. % cellulosic fibers and weft reinforcement yarns having a fiber blend of 30 wt. % to 100 wt. % non-FR synthetic fibers. The fiber blend of the weft reinforcement yarns may comprise at least two times the wt. % of non-FR synthetic fibers in the fiber blend of the weft body yarns.

Described are flame resistant fabrics having a warp direction, a weft direction, and a fabric weight. The flame resistant fabrics may include warp direction yarns and weft direction yarns, where the warp direction yarns include warp body yarns having a fiber blend of a wt. % of non-FR synthetic fibers and at least 60 wt. % cellulosic fibers; and the weft direction yarns include weft body yarns having a fiber blend of a wt. % of non-FR synthetic fibers and at least 60 wt. % cellulosic fibers and weft reinforcement yarns having a fiber blend of 30 wt. % to 100 wt. % non-FR synthetic fibers. The fiber blend of the weft reinforcement yarns may comprise at least two times the wt. % of non-FR synthetic fibers in the fiber blend of the weft body yarns.