Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
  • A41G3/00—Wigs
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
  • C08K3/2279—Oxides; Hydroxides of metals of antimony
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
  • C08L71/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F1/00—General methods for the manufacture of artificial filaments or the like
  • D01F1/02—Addition of substances to the spinning solution or to the melt
  • D01F1/07—Addition of substances to the spinning solution or to the melt for making fire- or flame-proof filaments
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/90—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyamides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2201/00—Properties
  • C08L2201/02—Flame or fire retardant/resistant
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/12—Applications used for fibers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
  • C08L2205/16—Fibres; Fibrils
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/22—Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer

Definitions

• the present invention relates to fiber used for artificial hair, such as wigs, hairpieces, and hair extensions, allowed to be put on and off of the head (hereinafter, simply referred to as “fiber for artificial hair”).
• materials making up fiber for artificial hair include vinyl chloride resins. This is because vinyl chloride resins in the fiber for artificial hair are excellent in processability, cost reduction, and the like.
• such a vinyl chloride resin is poor in heat resistance to heat from a curling iron and the like.
• a curling iron or the like generally set at a temperature of 100° C. or more, such fiber may thus be fused and frizzled and sometimes results in damage and breaking of the fiber.
• polyamide based fiber for artificial hair is under development, which is highly heat resistant.
• Polyamide unfortunately has a risk of dropping a molten resin during combustion and may cause burning due to contact with the molten resin. It is thus desired to give performance resistant to melt dripping during combustion (hereinafter, simply referred to as “drip resistance”).
• PTL 2 discloses fiber for artificial hair produced by fiberizing a resin composition containing polyamide and a bromine-based flame retardant. Addition of the bromine-based flame retardant to polyamide improves the drip resistance of polyamide, and the problems of the fiber for artificial hair using polyamide as a material are solved to some extent.
• the fibers for artificial hair using aliphatic polyamide as a material provide good texture like human hair while having a risk of dripping the molten resin during combustion as described above, and thus it is desired to give drip resistance from the perspective of the safety of a wearer.
• a flame retardant is generally added.
• the flame retardant bromine-based flame retardants, phosphorus-based flame retardants, nitrogen-based flame retardants, hydrated metal compounds, and the like are commercially available. Among them, combination of a bromine-based flame retardant and an auxiliary flame retardant is considered to have the highest combustion inhibiting effect.
• the combination of polyamide and a bromine-based flame retardant is not, however, compatible and causes insufficient dispersion of the bromine-based flame retardant in the polyamide resin during melt kneading. It thus has a problem of causing a defect, such as yarn breaking, during processing into a fibrous form, leading to significant reduction in productivity.
• the present invention has been made in view of such circumstances, and it is to provide drip-resistant polyamide-based fiber for artificial hair that provide good texture like human hair, is excellent in drip resistance, and is excellent in productivity.
• fiber for artificial hair includes a resin composition containing: at least one aliphatic polyamide; semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant.
• fiber for artificial hair containing aliphatic polyamide, semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid, and a bromine-based flame retardant provides polyamide-based fiber for artificial hair having good drip resistance, excellent texture, and good productivity, and thus have come to complete the present invention.
• Fiber for artificial hair of the present invention contains a resin composition having respectively at least one or more of: aliphatic polyamide; semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant.
• aliphatic polyamide semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid
• a bromine-based flame retardant As described in experimental examples later, the fiber for artificial hair containing a mixture of the above three materials is understood to have good drip resistance, texture, and productivity.
• the resin composition making up the fiber for artificial hair is described below in detail.
• the fiber for artificial hair of the present invention contains a resin composition having respectively at least one or more of: aliphatic polyamide; and semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid.
• the aliphatic polyamide is polyamide having no aromatic ring.
• Examples of the aliphatic polyamide include n-nylon formed by ring-opening polymerization of lactam and n,m-nylon synthesized by co-polycondensation reaction of aliphatic diamine and aliphatic dicarboxylic acid.
• Lactam preferably has a carbon number from 6 to 12 and more preferably of 6.
• Aliphatic diamine and aliphatic dicarboxylic acid respectively preferably have a carbon number from 6 to 12 and more preferably of 6.
• Aliphatic diamine and aliphatic dicarboxylic acid preferably have a functional group (amino group or carboxyl group) at both ends of the carbon chain, while the functional groups may be in positions other than the both ends.
• the carbon chain is preferably linear, while it may be branched.
• Examples of such aliphatic polyamide include polyamide 6 and polyamide 66. From the perspective of heat resistance, polyamide 66 is preferred. Specific examples of such polyamide 6 include CM1007, CM1017, CM1017XL3, CM1017K, and CM1026 produced by Toray Industries, Inc.
• polyamide 66 examples include CM3007, CM3001-N, CM3006, and CM3301L produced by Toray Industries, Inc., Zytel 101 and Zytel 42A produced by Du Pont K.K., and LEONA 1300S, 1500, and 1700 produced by Asahi Kasei Chemicals Corp.
• Examples of such semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid include polyamide 6T, polyamide 9T, and polyamide 10T, as well as modified polyamide 6T, modified polyamide 9T, and modified polyamide 10T that are produced by copolymerizing a monomer for modification based thereon.
• polyamide 10T is preferred for ease of melt molding.
• Aliphatic diamine preferably has a carbon number from 6 to 10 and more preferably of 10.
• Aliphatic diamine preferably has an amino group at both ends of the carbon chain while the amino groups may be in positions other than the both ends.
• the carbon chain is preferably linear while it may be branched.
• Examples of such aromatic dicarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid, and the like. Among them, terephthalic acid is most preferred.
• polyamide 6T and modified polymers thereof include VESTAMID HP Plus M1000 produced by Evonik Industries AG, ARLEN produced by Mitsui Chemicals, Inc., and the like.
• polyamide 9T and modified polymers thereof include Genestar produced by Kuraray Co., Ltd.
• polyamide 10T and modified polymers thereof include VESTAMID HO Plus M3000 produced by Evonik Japan Co., Ltd., Grivory produced by EMS-CHEMIE AG, and the like.
• the aliphatic polyamide and the semi-aromatic polyamide are mixed at a ratio preferably ranging from 50 parts by mass/50 parts by mass to 99 parts by mass/1 part by mass and more preferably ranging from 70 parts by mass/30 parts by mass to 90 parts by mass/10 parts by mass. It is understood that a ratio of the semi-aromatic polyamide less than the above range causes a decrease in the effect of productivity improvement by adding the semi-aromatic polyamide. While fiber for artificial hair containing aliphatic polyamide provides good texture like human hair as described above, it is understood that a ratio of the semi-aromatic polyamide greater than the above range causes a decrease in the texture.
• the aliphatic polyamide has a weight average molecular weight (Mw), for example, from 65 thousand to 150 thousand. Mw of more than 65 thousand results in particularly good drip resistance, whereas Mw of more than 150 thousand causes an increase in melt viscosity of the material and poor processability for fiberization. Mw is thus preferably 150 thousand or less. Considering the balance between the drip resistance and the processability, Mw is more preferably from 70 thousand to 120 thousand.
• the fiber for artificial hair of the present invention contains at least one or more of bromine-based flame retardants.
• the flame retardant is added in an amount preferably from 3 to 30 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide and an amount of the semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid, and more preferably from 10 to 30 parts by mass. This is because the balance between the drip resistance giving effect and the processability is good within the above range.
• bromine-based flame retardant examples include brominated phenol condensates, brominated polystyrene resins, brominated benzil acrylate-based flame retardants, brominated epoxy resins, brominated phenoxy resins, brominated polycarbonate resins, and bromine-containing triazine-based compounds.
• brominated phenol condensate examples include SR-460B produced by DKS Co. Ltd.
• brominated polystyrene resin examples include HP-7010 and HP-3010 produced by Albemarle Corp., PS900 and PL1200 produced by Manac Inc., PDBS-80 and PBS-64HW produced by Chemtura Japan Ltd., FCP-8000 and FCP-8000ST produced by Suzuhiro Chemical Co., Ltd., and the like.
• brominated benzil acrylate-based flame retardant examples include FR-1025 produced by ICL.
• brominated epoxy resin examples include SRT-20000, SRT-5000, SRT-2000, SRT-7040, and SRT-3040 produced by Sakamoto Yakuhin Kogyo Co., Ltd., F-2100, F-2300H, F-2400, and F-2400H produced by ICL Japan Ltd., and the like.
• brominated phenoxy resin examples include YPB-43C and YPB-43M produced by Nippon Steel & Sumikin Chemical Co., Ltd.
• brominated polycarbonate resin examples include Fire Guard FG-7000, Fire Guard FG-7500, and Fire Guard FG-8500 produced by Teijin Ltd.
• bromine-containing triazine-based compound examples include SR-245 produced by DKS Co. Ltd.
• a brominated epoxy resin or a brominated phenoxy resin having a structural formula (1) below is preferred.
• the fiber for artificial hair of the present invention contains an auxiliary flame retardant in addition to aliphatic polyamide, semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid, and a bromine-based flame retardant, for further improvement in the drip resistance and the self-extinguishing properties, which is preferred.
• the auxiliary flame retardant include antimony trioxide, antimony tetroxide, antimony pentoxide, sodium antimonate, zinc borate, and zinc stannate. Among them, for the balance between the drip resistance and the transparency of the yarn, antimony trioxide is preferred.
• the auxiliary flame retardant is preferably added in an amount from 0.1 to 10 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide and an amount of the semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid and more preferably from 1 to 5 parts by mass. This is because the balance between the drip resistance, the self-extinguishing properties, the processability, and the transparency of the yarn is best within the above range. If the auxiliary flame retardant is added in an amount more than the above range, the transparency of the yarn and the processability are reduced. If the auxiliary flame retardant is added in an amount less than the above range, the effects of improving the drip resistance and the self-extinguishing properties are reduced.
• the auxiliary flame retardant has an average particle size preferably ranging from 1 to 10 ⁇ m and more preferably ranging from 3 to 8 ⁇ m.
• the “average particle size” herein means a particle size with an integrated value of 50% in the particle size distribution obtained by laser diffraction scattering.
• the auxiliary flame retardant may be a combination of plural items from the group consisting of antimony trioxide, antimony tetroxide, antimony pentoxide, sodium antimonate, zinc borate, and zinc stannate or a composite of two or more from the group.
• the fiber for artificial hair of the present invention has more improved low glossiness and is allowed to have an appearance more like human hair.
• the organic microparticles include crosslinked nitrile rubber, a crosslinked acrylic resin, crosslinked polyester, crosslinked polyamide, a crosslinked silicone resin, a crosslinked polystyrene resin, and a crosslinked polyethylene resin.
• crosslinked nitrile rubber is preferred.
• the resin composition containing organic or inorganic microparticles or the like for reduction of glossiness of the fiber tends to cause whitening of the fiber after drawing. Accordingly, for predetermined coloring of the resin composition, the amount of colorant to be added sometimes has to be increased.
• Crosslinked nitrile rubber is preferred because, in spite of such tendency, addition of organic microparticles containing crosslinked nitrile rubber inhibits such whitening.
• the crosslinked nitrile rubber has an AN ratio preferably ranging from 30 to 50 mass %. This is because addition of crosslinked nitrile rubber in the above range leads to particularly good processability of the fiber for artificial hair.
• the organic microparticles are added in an amount from 3 to 30 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide and an amount of the semi-aromatic polyamide and more preferably from 5 to 20 parts by mass.
• the organic microparticles preferably have an average particle size from 0.05 to 15 ⁇ m, more preferably from 0.05 to 10 ⁇ m, and even more preferably from 0.05 to 5 ⁇ m. This is because such a range has sufficiently large effects of controlling a gloss and a shine and also does not easily cause reduction in fiber strength due to addition of the microparticles.
• the resin composition used in the present embodiment may contain, in addition to polyamide, additives such as heat resistant agents, light stabilizers, fluorescent agents, antioxidants, antistatic agents, pigments, dyes, plasticizers, and lubricants, as needed.
• additives such as heat resistant agents, light stabilizers, fluorescent agents, antioxidants, antistatic agents, pigments, dyes, plasticizers, and lubricants, as needed.
• colorants such as pigments and dyes, may be contained to produce precolored fiber (so-called spun-dyed fiber).
• the aliphatic polyamide, the semi-aromatic polyamide, and the bromine-based flame retardant described above are melt kneaded.
• various general kneaders may be used.
• a melt kneader include a single-screw extruder, a twin-screw extruder, a roll, a banbury mixer, a kneader, and the like.
• a twin-screw extruder is preferred in point of control of the degree of kneading and the ease of operation.
• the fiber for artificial hair is produced by general melt spinning in an appropriate temperature condition depending on the type of polyamide.
• a melt spinning device such as an extruder, a spinneret, and a gear pump as needed is set at a temperature from 270 to 310° C. for melt spinning.
• the resin is cooled in a tank filled with cooling water, and while controlling the fineness, the take up speed is adjusted to obtain undrawn yarn.
• the temperature of the melt spinning apparatus may be controlled as appropriate for the amount ratio of aliphatic polyamide and semi-aromatic polyamide.
• the cooling is not limited to be in a tank and spinning by cooling with cold air is also applicable.
• the temperature of the cooling tank, the temperature of cold air, the cooling time, and the take up speed may be appropriately controlled in accordance with the discharge and the number of holes in the spinneret.
• a spinning nozzle with nozzle holes in a special shape may be used to produce artificial hair fiber with a cross section in a deformed shape, such as an oval shape, a Y shape, an H shape, an X shape, and a flower shape.
• the undrawn yarn thus obtained is subjected to drawing for improvement in tensile strength of the fiber.
• the drawing may be in either method of: the two-step method where the undrawn yarn is once taken up on a bobbin to be drawn in a step separate from the melt spinning; and direct spin drawing where drawing is performed continuously from the melt spinning without taking up on a bobbin.
• the drawing is performed by single-stage drawing to draw to the target draw ratio at a time or multi-stage drawing to draw to the target draw ratio in drawing at two or more times.
• a heating mechanism in a case of hot drawing may be a heating roller, a heating plate, a steam jet apparatus, a hot water tank, and the like, and they may be used in combination as appropriate.
• the fiber for artificial hair in the present embodiment preferably has fineness from 10 to 150 dtex, more preferably from 30 to 150 dtex, and even more preferably from 35 to 120 dtex.
• An aliphatic polyamide resin, a semi-aromatic polyamide resin, and a bromine-based flame retardant that were dried to have a moisture absorption of less than 1000 ppm were blended at blend ratios for Examples and Comparative Examples in Tables 1 to 5.
• the numerical values of amounts of polyamide, flame retardants, auxiliary flame retardants, and organic microparticles in Tables 1 to 5 are in parts by mass.
• the blended material was kneaded using a ⁇ 30 mm twin-screw extruder to obtain spinning material pellets.
• the pellets were then dehumidified and dried to have a moisture absorption of 1000 ppm or less, followed by spinning using a ⁇ 40 mm single spindle melt spinner.
• the molten resin delivered from a die with a hole diameter of 0.5 mm was cooled through a water tank at approximately 30° C. while the discharge and the take up speed were controlled to prepare undrawn yarn at preset fineness.
• the ⁇ 40 mm melt spinner was set at a temperature appropriately controlled in accordance with the ratio of the amounts of aliphatic polyamide and semi-aromatic polyamide and the amount of the bromine-based flame retardant.
• the undrawn yarn thus obtained was drawn at 100° C., followed by annealing from 150° C. to 200° C. to produce fiber for artificial hair at predetermined fineness.
• the draw ratio was 3 and a relaxation rate for annealing was from 0.5% to 3%.
• the relaxation rate for annealing is a value calculated by (rotation speed of take up roller during annealing)/(rotation speed of feed roller during annealing).
• the fiber for artificial hair thus obtained was evaluated for the glossiness, self-extinguishing properties, drip resistance, texture, processability, and transparency in accordance with evaluation methods and criteria described later. Results are shown in Tables 1 to 5.
• the weight average molecular weight (Mw) in Tables 1 to 5 was measured by the following method.
• the weight average molecular weight Mw was obtained by measurement using the following equipment in the conditions below.
• Three thousand fibers for artificial hair were prepared in a bundle with a length of 20 cm to be observed in the sunlight for determination in accordance with the following evaluation criteria.
• the flammability was evaluated in the aspects of “self-extinguishing properties” and “drip resistance”.
• the fiber for artificial hair was cut with a length of 30 cm and the number of fibers with a weight of 2 g was separated to prepare a fiber bundle sample.
• An end of the fiber bundle was fixed to be vertically hung, and the lower end was in contact with a flame with a length of 20 mm for 5 seconds, followed by respective measurement of fire spread time after removal from the flame and the number of dripping during the time for determination as follows. For the result of measurement, an average of three measurements was used.
• the texture was evaluated by the evaluation criteria below, bundling each fiber for artificial hair in Examples and Comparative Examples with a length of 200 mm and a weight of 1.0 g to be touched with the hand of 10 artificial hair fiber treatment engineers (with 5 years or more of practical experience) for determination.
• a bundle of 100 fibers of undrawn yarn was drawn at a draw ratio of 3 and the number of yarn breaking during the drawing was determined for evaluation by the following evaluation criteria.
• the transparency was evaluated by the evaluation criteria below, bundling each fiber for artificial hair in Examples and Comparative Examples with a length of 200 mm and a weight of 1.0 g to be visually observed by 10 artificial hair fiber treatment engineers (with 5 years or more of practical experience) for comparison with human hair.
• auxiliary flame retardant in an appropriate amount allowed even more improvement in drip resistance and self-extinguishing properties during combustion and even more. It was further found that addition of the organic microparticles in an appropriate amount allowed the glossiness to be even more like human hair.
• Comparing Examples 27 to 32 it was found that the case of using antimony trioxide as the auxiliary flame retardant provided particularly good transparency and drip resistance. Comparing Examples 27 and 33 to 37, it was further found that the cases of using the auxiliary flame retardant with an average particle size from 1 to 10 ⁇ m provided good transparency and the cases from 3 to 8 ⁇ m provided particularly good transparency. Comparing Examples 27 and 38 to 42, it was further found that the cases of using from 0.1 to 10 parts by mass of the auxiliary flame retardant provided good texture and transparency and the cases from 1 to 5 parts by mass provided particularly good processability and drip resistance.
• Comparing Examples 43 to 47 it was found that the case of using crosslinked nitrile rubber with an AN ratio from 30 to 50 mass % as the organic microparticles provided particularly good transparency and processability. Comparing Examples 43 and 48 to 51, it was found that the cases of using from 3 to 30 parts by mass of the organic microparticles provided particularly good glossiness, processability, and self-extinguishing properties.
• Comparative Examples 1 to 5 containing no bromine-based flame retardant had poor drip resistance. Comparative Examples 6 to 8 containing no semi-aromatic polyamide had poor processability. Further, Comparative Example 9 containing polyamide MXD6, as semi-aromatic polyamide, with a skeleton obtained by polycondensation of aliphatic dicarboxylic acid and aromatic diamine did not have good processability. From these results, it was found that semi-aromatic polyamide with the specific skeleton was essential for improvement in processability.

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