The present disclosure relates to a core-sheath conjugate fiber for artificial hair including a core part and a sheath part. The core-sheath conjugate fiber for artificial hair has a flat multilobed cross sectional shape, and has a core-to-sheath area ratio of 2:8 to 9:1, and a viscosity ratio a/b between a melt viscosity a of a core part resin composition and a melt viscosity b of a sheath part resin composition is 2.0 or more and 7.0 or less. The present disclosure provides a core-sheath conjugate fiber for artificial hair having a touch close to that of human hair, excellent peel resistance at room temperature, and good combing property, a hair ornament product including the core sheath conjugate fiber, and a production method.

A fiber for artificial hair formed of a polyvinyl chloride-based resin composition. The fiber for artificial hair has a value X1 of a loss tangent tans at 70° C. of 0.06 or more and 0.12 or less, when dynamic viscoelasticity is measured under the following conditions, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower. (Dynamic viscoelasticity measurement conditions)The measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.

To provide a reversibly thermochromic composite fiber having a reversible color change due to a temperature change, having such excellent flame retardancy that flame is hard to spread even if ignition occurs once, and having high safety.

[Solution] Disclosed is a sheath-core type reversibly thermochromic composite fiber including a core comprising a resin, a reversibly thermochromic pigment, and a flame retardant, and a sheath comprising a resin and a flame retardant.

A fiber for artificial hair, having a base fiber, a cationic polymer, a cationic surfactant, and a nonionic surfactant, in which the cationic polymer, the cationic surfactant, and the nonionic surfactant are present in at least a part of a surface of the base fiber, the cationic polymer has, as a monomer unit, a monomer having at least one selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, acid-neutralized groups of these groups, and a quaternary ammonium group, the cationic surfactant has a carbon chain having 12 to 22 carbon atoms, the nonionic surfactant has a carbon chain having 10 to 20 carbon atoms, an HLB value of the nonionic surfactant is 13.0 or more, and a content of the cationic polymer is 0.005% by mass or more based on a total amount of the fiber for artificial hair.

Disclosed is a fiber for artificial hair, containing a polyamide-based resin and a maleic acid-based polymer having at least one maleic acid compound selected from the group consisting of maleic acid and a maleic acid derivative as a monomer unit. Also disclosed is a headdress article including the fiber for artificial hair. Also disclosed is a method for producing a fiber for artificial hair, the method including a step of spinning a composition containing a polyamide-based resin and a maleic acid-based polymer having at least one maleic acid compound selected from the group consisting of maleic acid and a maleic acid derivative as a monomer unit.

The present disclosure provides methods for making synthetic hair compositions. The methods generally comprise providing a plant fiber, degumming the plant fiber, and dyeing the plant fiber. The present disclosure also provides methods of degumming banana fiber. The methods generally comprise providing banana fiber and soaking the banana fiber in a degumming solution comprising a base, magnesium sulfate, and hydrogen peroxide. The present disclosure further provides methods of dyeing banana fibers. The present disclosure further provides synthetic hair compositions comprising banana fibers made by the methods described herein.

Provided are a compression-type textured strand for a wig and a method for manufacturing same. The compression-type textured strand for a wig is carried in a compressed form and, by rapid application of tension thereto before it is worn, is enabled to recover its external shape. Therefore, the strand can satisfy both the economic feasibility of the logistics process and the aesthetic sensation when it is worn.

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.sup.−3 to 5.5×10.sup.−3 gf.Math.cm.sup.2/yarn.

A polyvinyl chloride-based fiber for artificial hair that has excellent low glossiness and grip performance when woven and can be stably spun. Configuring a fiber for artificial hair using a polyvinyl chloride-based resin composition, wherein the polyvinyl chloride-based resin includes, at predetermined blending amounts, a polyvinyl chloride-based resin (A) having a viscosity-average polymerization degree of 450-1,700 and a crosslinked vinyl chloride-based resin (B) in which the viscosity-average polymerization degree of a component that dissolves in tetrahydrofuran is 1,800-2,300, the difference between the viscosity-average polymerization degree of the polyvinyl chloride-based resin (A) and the viscosity-average polymerization degree of the THF-soluble component of the crosslinked vinyl chloride-based resin (B) is in a predetermined range, and the cross-sectional shape of the fiber for artificial hair has a first projection, a second projection, and a third projection and the lengths and widths thereof satisfy predetermined conditions.

A fiber treatment agent can provide artificial hair fiber with softness. The fiber treatment agent includes a cationic polymer having a structural unit derived from diallyldimethylammonium chloride (DADMAC), and content of the cationic polymer is 0.02 to 0.5 weight %. The cationic polymer preferably has a structural unit derived from acrylamide. Preferably, the fiber treatment agent further includes an antistatic agent, and content of the antistatic agent is 0.2 to 5.0 weight %.