Abstract: Provided are an artificial hair fiber having a soft texture and appearance close to human hair, and being light in weight; and a head accessory including the artificial hair fiber. A polyamide fiber for artificial hair includes a resin composition that includes a polyamide resin as a primary component resin, and is a hollow fiber having a void in the cross-sectional center section, the void percentage of the polyamide fiber is 15-40%, the fiber specific gravity of the polyamide fiber is 0.80-1.10, and the bend rigidity of the polyamide fiber is 1.5×10?3 to 5.5×10?3 gf·cm2/yarn.

Abstract: A core-sheath conjugate fiber for artificial hair has a core-sheath structure including a core and a sheath covering the core. The core is composed of a core resin composition containing a polyester-based resin, and the sheath is composed of a sheath resin composition containing a polyamide-based resin. The core resin composition contains a bromine-based flame retardant and a flame retardant auxiliary. The sheath resin composition contains a phosphorus-based flame retardant. The phosphorus-based flame retardant contains at least one selected from the group consisting of a zinc phosphinate and a condensed phosphate ester compound.

Abstract: Fibers for artificial hair containing resin particles adhering to the fiber surface are provided. The amount of the resin particles adhering to the fiber surface is 0.3% omf or more and 1.1% omf or less. The average particle diameter of the resin particles is 1 ?m or more and 20 ?m or less. A method for producing the fibers for artificial hair, includes applying a resin emulsion having an average particle diameter of 350 nm or more to the fiber surface, in an amount of 0.3% omf or more and 1.1% omf or less on a solid basis. The fibers for artificial hair having an excellent combing property and a gloss close to human hair, hair ornament products including the same, and a method for producing the same are provided.

Abstract: 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 ?m2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

Abstract: 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 ?m2 or less in an area of 40 ?m long and 80 ?m wide of the side surface of the fiber.

Abstract: A method for producing acrylic fiber includes preparing a spinning solution including an acrylic copolymer, dimethyl sulfoxide, water, and a polyphosphate; and subjecting the spinning solution to wet spinning, wherein the acrylic copolymer includes acrylonitrile in an amount of 20 to 85 mass %, vinyl chloride in an amount of 14.5 to 79.5 mass %, and a sulfonic acid group-containing monomer in an amount of 0.5 to 10 mass % with respect to a total mass of the acrylic copolymer.

Abstract: The present invention relates to a pile fabric including an acrylic synthetic fiber at a napped portion, the acrylic synthetic fiber is obtained by spinning a spinning solution including 90 to 99 parts by weight of a polymer A and 1 to 10 parts by weight of a polymer B. The polymer A is a polymer obtained by polymerizing a composition A including 40 to 97 wt % of acrylonitrile, 0 to 5 wt % of a sulfonic acid-containing monomer and 3 to 60 wt % of another copolymerizable monomer. The polymer B is obtained by polymerizing a composition B including 0 to 70 wt % of acrylonitrile, 20 to 90 wt % of acrylic ester and 10 to 40 wt % of a sulfonic acid-containing monomer, and the polymer B is a polymer to be dissolved in a mixed solvent composed of water and at least one organic solvent selected from the group consisting of N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide and acetone.

Abstract: The present invention relates to a pile fabric including an acrylic synthetic fiber at a napped portion, the acrylic synthetic fiber is obtained by spinning a spinning solution including 90 to 99 parts by weight of a polymer A and 1 to 10 parts by weight of a polymer B. The polymer A is a polymer obtained by polymerizing a composition A including 40 to 97 wt % of acrylonitrile, 0 to 5 wt % of a sulfonic acid-containing monomer and 3 to 60 wt % of another copolymerizable monomer. The polymer B is obtained by polymerizing a composition B including 0 to 70 wt % of acrylonitrile, 20 to 90 wt % of acrylic ester and 10 to 40 wt % of a sulfonic acid-containing monomer, and the polymer B is a polymer to be dissolved in a mixed solvent composed of water and at least one organic solvent selected from the group consisting of N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide and acetone.