An acrylic fiber for artificial hair includes an acrylic polymer, wherein the acrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a vinyl monomer comprising a sulfonic acid group. The acrylic fiber for artificial hair includes 0.3 to 2% by mass of a good solvent for the acrylic polymer and 0.1 to 5% by mass of a compound comprising an epoxy group.

An acrylic fiber for artificial hair includes an acrylic polymer, wherein the acrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a vinyl monomer comprising a sulfonic acid group. The acrylic fiber for artificial hair includes 0.3 to 2% by mass of a good solvent for the acrylic polymer and 0.1 to 5% by mass of a compound comprising an epoxy group.

A thermoplastic modacrylic resin composition includes a modacrylic resin and a plasticizer The modacrylic resin includes 15 to 85 wt % of acrylonitrile, 15 to 85 wt % of vinyl chloride and/or vinylidene chloride, and 0 to 20 wt % of another vinyl monomer, and the plasticizer is an organic compound that is compatible with the modacrylic resin and has a boiling point of at least 200 C. A method for manufacturing a thermoplastic modacrylic resin composition includes melt-kneading a powder mixture obtained by mixing a modacrylic resin powder and an organic compound that is compatible with the modacrylic resin and has a boiling point of at least 200 C. Acrylic fibers are composed of a thermoplastic modacrylic resin composition.

A thermoplastic modacrylic resin composition includes a modacrylic resin and a plasticizer The modacrylic resin includes 15 to 85 wt % of acrylonitrile, 15 to 85 wt % of vinyl chloride and/or vinylidene chloride, and 0 to 20 wt % of another vinyl monomer, and the plasticizer is an organic compound that is compatible with the modacrylic resin and has a boiling point of at least 200 C. A method for manufacturing a thermoplastic modacrylic resin composition includes melt-kneading a powder mixture obtained by mixing a modacrylic resin powder and an organic compound that is compatible with the modacrylic resin and has a boiling point of at least 200 C. Acrylic fibers are composed of a thermoplastic modacrylic resin composition.

A flame-retardant upholstered furniture includes an inner structure, and a flame-blocking fabric that covers the inner structure. The flame-blocking fabric contains flame-retardant modacrylic fibers (A) in an amount of 60 mass % or more and 90 mass % or less, and cellulose fibers (B) in an amount of 10 mass % or more and 40 mass % or less, with respect to the overall mass of the fabric. The flame-retardant modacrylic fibers (A) contain a magnesium compound. The flame-blocking fabric contains the magnesium compound in an amount of 1.5 mass % or more and 13.5 mass % or less with respect to the overall mass of the fabric. Time until both afterflame and afterglow go out of the flame-retardant upholstered furniture is 120 seconds or less when measured through a flammability test based on BS 5852: 2006.

Described are antibacterial acrylic artificial hair fibers containing chitosan and a nonionic surfactant. The amount of chitosan extracted with diluted acetic acid is 0.005% by weight to 0.4% by weight. The amount of chitosan extracted with concentrated hydrochloric acid is 0.013% by weight to 1.3% by weight. The nonionic surfactant contains a sorbitan fatty acid ester and a polyoxyethylene triglyceride. The amount of the nonionic surfactant is 0.1% by weight to 0.9% by weight, and the percentage of the sorbitan fatty acid ester in the nonionic surfactant is 20% by weight to 90% by weight.

Described are antibacterial acrylic artificial hair fibers containing chitosan and a nonionic surfactant. The amount of chitosan extracted with diluted acetic acid is 0.005% by weight to 0.4% by weight. The amount of chitosan extracted with concentrated hydrochloric acid is 0.013% by weight to 1.3% by weight. The nonionic surfactant contains a sorbitan fatty acid ester and a polyoxyethylene triglyceride. The amount of the nonionic surfactant is 0.1% by weight to 0.9% by weight, and the percentage of the sorbitan fatty acid ester in the nonionic surfactant is 20% by weight to 90% by weight.

An acrylic fiber for artificial hair includes an acrylic copolymer obtained by copolymerizing acrylonitrile, vinyl chloride and/or vinylidene chloride, and a sulfonic acid group-containing vinyl monomer; and an organic solvent that can dissolve the acrylic copolymer, where the organic solvent is present in an amount of 0.1 to 3% by mass with respect to the total mass of the acrylic fiber for artificial hair. The acrylic fiber for artificial hair has an average surface roughness of 5900 ?m.sup.2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

An acrylic fiber for artificial hair includes an acrylic copolymer obtained by copolymerizing acrylonitrile, vinyl chloride and/or vinylidene chloride, and a sulfonic acid group-containing vinyl monomer; and an organic solvent that can dissolve the acrylic copolymer, where the organic solvent is present in an amount of 0.1 to 3% by mass with respect to the total mass of the acrylic fiber for artificial hair. The acrylic fiber for artificial hair has an average surface roughness of 5900 ?m.sup.2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

Modacrylic fibers for artificial hair include a modacrylic polymer; and a condensed phosphate. The modacrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group containing vinyl monomer, with respect to a total mass of the modacrylic polymer. A content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass.