Fibers for artificial hair and wigs

Abstract

To provide a fiber for artificial hair containing a polyamide, which has a lustrous feel with suppressed gloss like natural hair, excellent sustained antistatic property, and also excellent heat setting property. The means for solving the problem is a fiber for artificial hair containing a thermoplastic polyamide and a high molecular antistatic agent having compatibility with the thermoplastic polyamide, the high molecular antistatic agent having a melting point lower than the melting point of the thermoplastic polyamide.

Description

Technical Field

[0001] This invention relates to artificial hair fibers used in wigs, hair extensions or substitute hair, and particularly to artificial hair fibers containing polyamide. Background Technology

[0002] Compared to synthetic fibers such as polyester, synthetic hair fibers containing polyamide are softer and more flexible, and have a texture and feel closer to natural hair. However, they are less likely to replicate the shine characteristic of natural hair, which is created by the texture of the cuticle. Furthermore, synthetic hair fibers generally have low moisture retention, generate static electricity when styling, and are difficult to comb.

[0003] Patent Document 1 describes an artificial hair fiber formed from a first thermoplastic resin as a matrix and a second thermoplastic resin that is incompatible with the first thermoplastic resin and has a different melting point. The fiber has an uneven surface, with the protruding portions formed by the first thermoplastic resin. The artificial hair fiber of Patent Document 1 can suppress luster while maintaining the strength and other physical properties of the matrix, and while preserving the shine of natural hair.

[0004] Patent Document 2 describes a synthetic hair fiber material obtained by mixing an additive containing a polyalkylene ether phosphate compound into polyamide, forming it into filaments, and then dissolving the additive. Because the additive possesses water-retaining and antistatic properties, the synthetic hair fiber material of Patent Document 2 exhibits both. However, on the other hand, due to the dissolution of the additive, the traces originally occupied by the additive form recesses or sponge-like cavities, creating small gaps on the surface of the fiber material.

[0005] Patent Document 3 describes a polyamide fiber for artificial hair, which is formed from a nylon 46 polymer composition containing cuprous halide and alkali metal halide or alkaline earth metal halide as heat-resistant agents. Conductive substances such as conductive carbon black can be added to this polyamide fiber for artificial hair, thereby preventing the loss of shape retention due to static electricity and the accumulation of dirt such as dust when used as artificial hair.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: WO2010 / 134561

[0009] Patent Document 2: Japanese Patent Publication No. 47-37649

[0010] Patent Document 3: Japanese Patent Application Publication No. 1-282309 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] The artificial hair is preferably pre-formed with a given curl during the manufacturing stage. This allows the style to be maintained for a longer period when the user styles their hair. Furthermore, the artificial hair is preferably free of static electricity. This allows the user to easily create the desired hairstyle using a comb or similar tool (hereinafter sometimes referred to as "styling").

[0013] For example, the polyamide-containing synthetic hair fibers described in Patent Document 1 have insufficient antistatic properties and heat-setting properties (hereinafter sometimes referred to as "heat setting properties"), and there are still problems with the formation of curls during the manufacturing stage and the shaping during use.

[0014] When using the additives described in Patent Document 2, small voids that are not typically present in natural hair are formed on the surface of the fiber material, making it difficult to exhibit the shine characteristic of natural hair. Furthermore, because the additives in Patent Document 2 migrate from the interior of the fiber material to the surface, they are shed during each shampooing and wiping process, resulting in insufficient durability of the antistatic properties.

[0015] The conductive material in Patent Document 3 is incompatible with polyamide, which has a significant impact on the physical properties of synthetic hair fibers, such as softness and strength. When it is used, it becomes difficult to reproduce the texture of natural hair.

[0016] The present invention is an invention to solve the above-mentioned problems. Its purpose is to provide a synthetic hair fiber containing polyamide, which has a suppressed luster similar to natural hair, excellent continuous antistatic properties, and excellent heat set properties.

[0017] Methods for solving problems

[0018] The present invention provides a fiber for artificial hair, comprising a thermoplastic polyamide and a polymeric antistatic agent having compatibility with the thermoplastic polyamide, the polymeric antistatic agent having a melting point below that of the thermoplastic polyamide.

[0019] In one embodiment, the aforementioned polymeric antistatic agent has a melting point of 160–250°C.

[0020] In one embodiment, the aforementioned polymeric antistatic agent has a melt flow rate of 10–40 g / 10 min at 215 °C.

[0021] In one particular method, the aforementioned polymeric antistatic agent has a content of 10. 6 ~10 10Ω / □ is the surface specific resistance value.

[0022] In one embodiment, the aforementioned polymeric antistatic agent comprises a polyether ester amide block copolymer.

[0023] In one embodiment, the aforementioned polyether ester amide block copolymer is a condensation product of a polyamide having carboxyl groups at both ends and a polyether diol containing an aromatic ring.

[0024] In one embodiment, the aforementioned polymeric antistatic agent is contained in an amount of 0.5 to 10% by weight.

[0025] In one embodiment, the aforementioned artificial hair fibers further comprise a thermoplastic polyester that is incompatible with thermoplastic polyamide and has a higher melting point.

[0026] In one embodiment, the aforementioned artificial hair fiber has a weight ratio of 75 / 25 to 85 / 15 of thermoplastic polyamide to thermoplastic polyester.

[0027] In one embodiment, the aforementioned artificial hair fibers have an uneven shape formed on the surface, the protrusions of which contain particles of thermoplastic polyester.

[0028] In one embodiment, the aforementioned artificial hair fiber has a matrix comprising thermoplastic polyamide and a regional structure comprising thermoplastic polyester.

[0029] In one embodiment, the aforementioned thermoplastic polyamide is at least one thermoplastic resin selected from linear saturated aliphatic polyamide, alternating copolymers of hexamethylenediamine and terephthalic acid, and alternating copolymers of m-phenylenediamine and adipic acid.

[0030] In one embodiment, the aforementioned thermoplastic polyester is at least one thermoplastic resin selected from polyethylene terephthalate and polybutylene terephthalate.

[0031] In addition, the present invention provides a wig having a wig base and any of the aforementioned artificial hair fibers implanted in the wig base.

[0032] Invention Effects

[0033] The polyamide-containing synthetic hair fibers of the present invention have a suppressed shine similar to natural hair, excellent antistatic properties, and excellent heat-setting properties. Therefore, the synthetic hair fibers of the present invention can be properly curled during the manufacturing stage, can be easily styled during use, and can maintain the styled hairstyle for a long time. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a spinning device using a conventional single-screw extruder, which is used in the manufacture of the synthetic fibers used in this invention.

[0035] Figure 2 This is a schematic diagram of a spinning apparatus using a conventional twin-screw extruder, which is used in the manufacture of the synthetic fibers used in this invention.

[0036] Figure 3 yes Figure 1 and Figure 2 A schematic diagram of the spinneret head.

[0037] Figure 4 This is a schematic diagram showing the process from spinning the synthetic fibers used in this invention to winding the fibers.

[0038] Figure 5 This is an 800x magnified image of the surface of the artificial hair fiber of Example 16.

[0039] Figure 6 This is a 1000x magnified image of a cross-section of the artificial hair fiber of Example 16. Detailed Implementation

[0040] <Artificial Hair Fibers>

[0041] The artificial hair fiber of the present invention comprises a thermoplastic polyamide and a polymeric antistatic agent compatible with the thermoplastic polyamide. The thermoplastic polyamide is a component constituting the shape of the artificial hair fiber, i.e., a matrix material. Thus, the artificial hair fiber becomes a fiber with a texture and feel close to natural hair, and excellent antistatic and heat-setting properties.

[0042] (Thermoplastic polyamide)

[0043] The thermoplastic polyamide contained in the artificial hair fiber of the present invention can be any thermoplastic polyamide that has been used as a raw material for artificial hair fibers. Examples of thermoplastic polyamides include linear saturated aliphatic polyamides such as nylon 6, nylon 66, and nylon 610, or semi-aromatic polyamides such as nylon 6T, which contains an alternating copolymer of hexamethylenediamine and terephthalic acid, or nylon MXD6, which is a high-molecular-weight semi-aromatic polyamide obtained by amide bonding of adipic acid and m-phenylenediamine.

[0044] Thermoplastic polyamide preferably has a melting point of 170–270°C. If the melting point of the thermoplastic polyamide is less than 170°C, its heat resistance as artificial hair is insufficient; if it is greater than 270°C, it will cause the inclusion of dissolved residues, which is a problem. The melting point of the thermoplastic polyamide is more preferably 200–250°C, and even more preferably 215–240°C.

[0045] Thermoplastic polyamide preferably has a melt flow rate of 10–80 g / 10 min at 240°C and 21.18 N. If the melt flow rate of the thermoplastic polyamide is less than 10 g / 10 min, uneven coloring will occur due to insufficient mixing; if it is greater than 80 g / 10 min, it will cause poor molding due to draw resonance. The melt flow rate of the thermoplastic polyamide is more preferably 15–60 g / 10 min, and even more preferably 20–40 g / 10 min.

[0046] (Polymer-type antistatic agent)

[0047] The polymeric antistatic agent contained in the synthetic hair fiber of the present invention can be any antistatic agent that has been used in synthetic resin materials. The polymeric antistatic agent has low moisture dependence and is not easily transferred from the interior to the surface of the fiber material. That is, by adding and compatibility of the polymeric antistatic agent to the fiber material, a conductive circuit is formed within the fiber material, imparting antistatic properties. As a result, the obtained synthetic hair fiber is a fiber with good appearance and feel, and consistently excellent antistatic effect.

[0048] From the viewpoint of achieving the above-mentioned effects, polymeric antistatic agents preferably have a polyether structure. Furthermore, polymeric antistatic agents are more preferably those having a polyethylene oxide structure.

[0049] The polymeric antistatic agent preferably has a melting point of 160–250°C. If the melting point of the polymeric antistatic agent is less than 160°C, the heat set of the resulting artificial hair fiber will be reduced; if it is greater than 250°C, the polymeric antistatic agent will be difficult to mix uniformly in the fiber material, resulting in insufficient antistatic effect of the resulting artificial hair fiber, and also easily leading to poor appearance. The melting point of the polymeric antistatic agent is preferably 180–230°C, more preferably 190–210°C.

[0050] The polymeric antistatic agent preferably has a melting point similar to that of the thermoplastic polyamide used as the base material. By making the melting point of the polymeric antistatic agent similar to that of the thermoplastic polyamide, the crimping properties of the fibers used for artificial hair are easily improved. For example, the difference between the melting point of the polymeric antistatic agent and that of the thermoplastic polyamide is within 30°C, preferably within 15°C, and more preferably within 10°C.

[0051] The polymeric antistatic agent preferably has a melting point below that of the thermoplastic polyamide used as the base material. If the melting point of the polymeric antistatic agent is higher than that of the thermoplastic polyamide, it may be difficult to uniformly mix the polymeric antistatic agent in the fibrous material.

[0052] In one embodiment, the polymeric antistatic agent preferably has a melt flow rate of 10–40 g / 10 min at 215°C and 21.18 N. If the melt flow rate of the polymeric antistatic agent is less than 10 g / 10 min, it is difficult to uniformly mix the polymeric antistatic agent in the fiber material, resulting in insufficient antistatic effect of the obtained artificial hair fiber and poor appearance. If it is greater than 40 g / 10 min, the polymeric antistatic agent tends to migrate from the interior of the fiber material to the surface, leading to a decrease in appearance, feel, or the sustainability of the antistatic effect. The melt flow rate of the polymeric antistatic agent is preferably 15–35 g / 10 min, more preferably 18–32 g / 10 min.

[0053] In another embodiment, the polymeric antistatic agent preferably has a melt flow rate of 3 to 35 g / 10 minutes at 190°C and 21.18 N. If the melt flow rate of the polymeric antistatic agent is less than 3 g / 10 minutes, it is difficult to uniformly mix the polymeric antistatic agent in the fiber material, resulting in insufficient antistatic effect of the obtained artificial hair fiber and poor appearance. If it is greater than 35 g / 10 minutes, the polymeric antistatic agent tends to migrate from the interior of the fiber material to the surface, leading to a decrease in appearance, feel, or the sustainability of the antistatic effect. The melt flow rate of the polymeric antistatic agent is preferably 5 to 30 g / 10 minutes, more preferably 8 to 17 g / 10 minutes.

[0054] The polymeric antistatic agent preferably has a melt flow rate that is higher than that of the thermoplastic polyamide used as the base material. If the melt flow rate of the polymeric antistatic agent is lower than that of the thermoplastic polyamide, the polymeric antistatic agent may be difficult to mix uniformly in the fibrous material.

[0055] Polymer antistatic agents preferably have 10 10 The inherent surface resistivity is below Ω / □. If the inherent surface resistivity of a polymeric antistatic agent is greater than 10... 10 If the surface resistivity is less than Ω / □, the antistatic effect may be insufficient. The preferred surface resistivity of polymeric antistatic agents is 5 × 10⁻⁶. 9 Ω / □ or less, more preferably 10 6 ~10 9 Ω / □. It should be noted that the inherent surface resistivity of polymeric antistatic agents can be determined as follows: the polymeric antistatic agent is molded separately, moistened at 23℃ and 50RH for 4 hours, and then measured using a superinsulator.

[0056] Polymer-based antistatic agents have a thermal decomposition onset temperature of 200°C or higher. If the thermal decomposition onset temperature of the polymer-based antistatic agent is lower than 200°C, it will easily decompose and deteriorate during the spinning process of the fiber material. The preferred thermal decomposition onset temperature of the polymer-based antistatic agent is 230°C or higher, more preferably 250–300°C. It should be noted that the thermal decomposition onset temperature of the polymer-based antistatic agent can be determined in air using a thermogravimetric differential thermal analysis (TG-DTA) apparatus.

[0057] Commercially available polymeric antistatic agents can be used. Examples of commercially available polymeric antistatic agents include Sanyo Chemicals' "PELESTAT 6200" (trade name), "PELESTAT 6500" (trade name), "PELESTAT NC6321" (trade name), "PELESTAT NC7530" (trade name), and "PELECTRONAS" (trade name). These commercially available products contain polyether ester amide block copolymers.

[0058] Other examples of commercially available polymeric antistatic agents include Sanyo Chemical's "PELECTRON LMP-FS" (trade name). This commercially available product contains a polyether / polyolefin block copolymer.

[0059] Preferably, the synthetic hair fiber contains a polymeric antistatic agent in an amount of 0.5 to 10% by weight. If the content of the polymeric antistatic agent in the synthetic hair fiber is less than 0.5% by weight, the antistatic effect is insufficient; if it is greater than 10% by weight, the polymeric antistatic agent will transfer from the interior of the fiber material to the surface, easily causing stickiness and adhesion. The content of the polymeric antistatic agent in the synthetic hair fiber is preferably 1 to 6% by weight, more preferably 1.5 to 4% by weight.

[0060] Examples of polymeric antistatic agents include block copolymers having polyether blocks and blocks exhibiting affinity for thermoplastic polyamides, polyether / polyolefin block copolymers, and polyether ester amide block copolymers. Among polymeric antistatic agents, polyether ester amide block copolymers exhibit excellent compatibility with polyamides and are therefore preferred. Among the aforementioned polyether blocks, polyethylene oxide blocks are preferred.

[0061] (Polyether / polyolefin block copolymer)

[0062] The polyether / polyolefin block copolymer is, for example, a block polymer having a structure in which blocks of the following polyolefin (a) and blocks of the following polyoxyethylene chain (b) are repeatedly and alternately bonded via at least one type of bond selected from ester bonds, amide bonds, ether bonds, and imide bonds. This block polymer is described in International Publication No. 00 / 47652, the disclosure of which is incorporated herein by reference.

[0063] As blocks of polyolefin (a), polyolefins obtained by (co)polymerization (representing polymerization or copolymerization. The same applies below) of one or more mixtures of olefins having 2 to 30 carbon atoms [polyolefins obtained by polymerization] and low molecular weight polyolefins obtained by thermal degradation of high molecular weight polyolefins (polyolefins obtained by polymerization of olefins having 2 to 30 carbon atoms) [polyolefins obtained by thermal degradation].

[0064] Examples of olefins with 2 to 30 carbon atoms include ethylene, propylene, α-olefins with 4 to 30 carbon atoms (preferably 4 to 12, more preferably 4 to 10) and dienes with 4 to 30 carbon atoms (preferably 4 to 18, more preferably 4 to 8).

[0065] Examples of α-olefins with 4 to 30 carbon atoms include 1-butene, 4-methyl-1-pentene, 1-pentene, 1-octene, 1-decene, and 1-dodecene. Examples of dienes include butadiene, isoprene, cyclopentadiene, and 1,11-dodecadiene.

[0066] Among them, olefins having 2 to 12 carbon atoms (ethylene, propylene, α-olefins having 4 to 12 carbon atoms, butadiene and / or isoprene, etc.) are preferred, olefins having 2 to 10 carbon atoms (ethylene, propylene, α-olefins having 4 to 10 carbon atoms and / or butadiene, etc.) are more preferred, and ethylene, propylene and / or butadiene are particularly preferred.

[0067] Low molecular weight polyolefins obtained by thermal degradation can be readily obtained, for example, by the method described in Japanese Patent Application Publication No. 3-62804. Polyolefins obtained by polymerization can be manufactured using known methods, such as by (co)polymerizing the above-mentioned olefins in the presence of free radical catalysts, metal oxide catalysts, Ziegler catalysts, and Ziegler-Natta catalysts.

[0068] As a block of the polyoxyethylene chain (b), examples include residues obtained by removing hydroxyl groups from polyether diols obtained by adding an epoxide (3 to 12 carbon atoms) to a diol (b01) or a diphenol (b02).

[0069] The structure of this polyether diol can be represented by the general formula: H(OA1)mO-E1-O(A1O)m′H.

[0070] In the formula, E1 represents a residue obtained by removing a hydroxyl group from (b01) or (b02); A1 represents an alkylene group with 2 to 12 carbon atoms (preferably 2 to 8, more preferably 2 to 4) as an essential group, which may contain a 2-carbon alkylene atom containing a halogen atom; m and m' represent integers from 1 to 300, preferably 2 to 250, and particularly preferably 10 to 100, and m and m' may be the same or different. Furthermore, m (OA1) and m' (A1O) may be the same or different, and when they are composed of two or more oxidized alkenyl groups with ethylene oxide as an essential component, the bonding form can be block, random, or any combination thereof.

[0071] Examples of diols (b01) include diols (aliphatic, alicyclic and aromatic aliphatic diols) with 2 to 12 carbon atoms (preferably 2 to 10, more preferably 2 to 8) and diols containing tertiary amino groups with 1 to 12 carbon atoms.

[0072] Examples of aliphatic diols include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, and 1,12-dodecanediol.

[0073] Examples of alicyclic diols include 1,4-cyclohexanediol, 1,4-cyclohexanediol, 1,4-cyclooctanediol, and 1,3-cyclopentanediol.

[0074] Examples of aromatic aliphatic diols include benzenediethanol, 1-phenyl-1,2-ethylenediol, and 1,4-di(hydroxyethyl)benzene.

[0075] Examples of diols containing tertiary amino groups include aliphatic or alicyclic primary monoamines (1 to 12 carbon atoms, preferably 2 to 10, more preferably 2 to 8 carbon atoms) dihydroxyalkyl (alkyl group with 1 to 12 carbon atoms, preferably 2 to 10, more preferably 2 to 8 carbon atoms) compounds and aromatic (aliphatic) primary monoamines (6 to 12 carbon atoms) dihydroxyalkyl (alkyl group with 1 to 12 carbon atoms) compounds.

[0076] Dihydroxyalkylates of monoamines can be readily obtained by using known methods, such as reacting the monoamine with 2-4 carbon alkyl oxides [ethylene oxide, propylene oxide, butane oxide, etc.] or reacting the monoamine with 1-12 carbon halohydroxyalkyl groups (2-bromoethyl alcohol, 3-chloropropyl alcohol, etc.).

[0077] Examples of aliphatic primary monoamines include methylamine, ethylamine, 1- and 2-propylamine, n- and isopentylamine, hexylamine, 1,3-dimethylbutylamine, 3,3-dimethylbutylamine, 2- and 3-aminoheptane, heptylamine, nonylamine, decylamine, undecylamine, and dodecylamine.

[0078] Examples of alicyclic primary monoamines include cyclopropylamine, cyclopentylamine, and cyclohexylamine.

[0079] Examples of aromatic (aliphatic) primary monoamines include aniline and benzylamine.

[0080] Examples of diphenols (bO2) include those with 6 to 18 carbon atoms (preferably 8 to 18, more preferably 10 to 15), such as monocyclic diphenols (hydroquinone, catechol, resorcinol, urushiol, etc.), bisphenols (bisphenol A, bisphenol F, bisphenol S, 4,4'-dihydroxydiphenyl-2,2-butane, dihydroxybiphenyl, etc.), and fused polycyclic diphenols (dihydroxynaphthalene, binatol, etc.).

[0081] From the viewpoint of antistatic properties, diols and diphenols are preferred in (b01) and (b02), aliphatic diols and bisphenols are more preferred, and ethylene glycol and bisphenol A are particularly preferred.

[0082] Examples of epoxides that can undergo addition reactions with diols (b01) or diphenols (b02) include ethylene oxide and epoxides with 3 to 12 carbon atoms (propylene oxide, 1,2-, 1,4-, 2,3- and 1,3-epoxide butane and mixtures of two or more thereof), and other epoxides and substituted epoxides may be used in combination as needed.

[0083] From the viewpoint of improving the appearance, feel, and antistatic properties of fibers used in artificial hair, ethylene oxide is preferred among the aforementioned epoxy alkanes. In this case, the polymeric antistatic agent becomes a block polymer with a polyethylene oxide structure.

[0084] Examples of other epoxides and substituted epoxides include epoxides of α-olefins having 5 to 12 carbon atoms, styrene oxides, and epihaloalcohols (e.g., epichlorohydrins and epibromohydrins). Regarding the amount of each of the other epoxides and substituted epoxides used, from the viewpoint of antistatic properties, based on the total weight of the epoxides, it is preferably 30% by weight or less, more preferably 0% or 25% by weight or less, and particularly preferably 0% or 20% by weight or less.

[0085] Regarding the molar number of alkyl epoxides added, from the viewpoint of the volume-specific resistance value of the polymer (b) having a polyoxyethylene chain, it is preferably 1 to 300 moles relative to one hydroxyl group of (b01) or (b02), more preferably 2 to 250 moles, and particularly preferably 10 to 100 moles. Furthermore, when two or more alkyl epoxides are used, the bonding form can be any of random and / or block alkyl.

[0086] The addition reaction of epoxides can be carried out using known methods in the presence of a base catalyst (such as potassium hydroxide or sodium hydroxide) at 100–200 °C and a pressure of 0–0.5 MPaG.

[0087] (Polyether ester amide block copolymer)

[0088] Polyether ester amide block copolymers are, for example, polyether ester amides derived from the following polyamide (a11) and the following bisphenol compound epoxide alkane adduct (a12). Such polyether ester amides are described in Japanese Patent Application Publication No. 6-287547 and Japanese Patent Application Publication No. 4-5691, the disclosures of which are incorporated herein by reference.

[0089] Examples of polyamides (a11) include (1) lactam ring-opening polymers, (2) condensation polymers of aminocarboxylic acids, and (3) condensation polymers of dicarboxylic acids and diamines.

[0090] Among these amide-forming monomers that form polyamides, examples of lactams in (1) include those with 6 to 12 carbon atoms, such as caprolactam, heptanolactam, laurolactam, and undecanolactam.

[0091] Examples of aminocarboxylic acids in (2) include those with 6 to 12 carbon atoms, such as ω-aminohexanoic acid, ω-aminoheptanoic acid, ω-aminooctanoic acid, ω-aminononanoic acid, ω-aminodecanoic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid.

[0092] Examples of dicarboxylic acids in (3) include aliphatic dicarboxylic acids, aromatic (aliphatic) dicarboxylic acids, alicyclic dicarboxylic acids, their amide-forming derivatives [e.g., acid anhydrides and lower (carbon 1-4) alkyl esters], and mixtures of two or more of them.

[0093] Examples of aliphatic dicarboxylic acids include those with 4 to 20 carbon atoms, such as succinic acid, glutaric acid, adipic acid, pimelic acid, octanoic acid, azelaic acid, sebacic acid, undecanoic acid, dodecanoic acid, maleic acid, fumaric acid, and itaconic acid.

[0094] Examples of aromatic (aliphatic) dicarboxylic acids include alkali metal (sodium, potassium, etc.) salts of phthalic acid, isophthalic acid and terephthalic acid, naphthalene-2,6-dicarboxylic acid and naphthalene-2,7-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid and 3-sulfoisophthalic acid, which have 8 to 20 carbon atoms.

[0095] Examples of alicyclic dicarboxylic acids include those with 7 to 14 carbon atoms, such as cyclopropanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, cyclohexenedicarboxylic acid, and dicyclohexyl-4,4-dicarboxylic acid.

[0096] Examples of acid anhydrides that are amide-forming derivatives include the acid anhydrides of the aforementioned dicarboxylic acids, such as maleic anhydride, itaconic anhydride, and phthalic anhydride. Examples of lower (1-4 carbon) alkyl esters that are lower alkyl esters of the aforementioned dicarboxylic acids include dimethyl adipate, dimethyl phthalate, dimethyl isophthalate, and dimethyl terephthalate.

[0097] In addition, examples of diamines include those with 6 to 12 carbon atoms, such as hexamethylenediamine, heptamethamine, octanediamine, and decanediamine.

[0098] The compounds exemplified as the above-mentioned amide-forming monomers may be used in combination with two or more.

[0099] From the viewpoint of antistatic properties, caprolactam, 12-aminododecanoic acid and adipic acid / hexamethylenediamine are preferred, with caprolactam being particularly preferred.

[0100] Polyamide (a11) can be obtained by using one or more dicarboxylic acids with 4 to 20 carbon atoms as molecular weight regulators, and by conventional methods to ring-opening polymerize or condense the above-mentioned amide-forming monomers in their presence.

[0101] As dicarboxylic acids with 4 to 20 carbon atoms, the compounds exemplified in (3) above can be cited. From the viewpoint of antistatic properties, aliphatic dicarboxylic acids, aromatic dicarboxylic acids and alkali metal salts of 3-sulfoisophthalic acid are preferred, and adipic acid, sebacic acid, terephthalic acid, isophthalic acid and sodium 3-sulfoisophthalate are more preferred.

[0102] Regarding the amount of the aforementioned molecular weight regulator used, based on the total weight of the amide-forming monomer and the molecular weight regulator, from the viewpoint of antistatic properties and heat resistance, it is preferably 2 to 80% by weight, and more preferably 4 to 75% by weight.

[0103] From the viewpoint of reactivity and heat resistance of the resulting polyether ester amide, the number-average molecular weight of the polyamide (a11) is preferably 200 to 5000, more preferably 500 to 3000.

[0104] Examples of bisphenol compounds that are epoxide alkane adducts (a12) constituting bisphenol compounds include those with 13 to 20 carbon atoms, such as bisphenol A, bisphenol F, and bisphenol S. Among these, bisphenol A is preferred from the viewpoint of dispersibility.

[0105] In addition, examples of epoxides that are added to bisphenol compounds include ethylene oxide, propylene oxide, 1,2-epoxide, 2,3-epoxide and 1,4-epoxide, epoxides of α-olefins having 2 to 12 carbon atoms, styrene oxide and epihaloalcohols (epoxide chloride and epibromool, etc.) and mixtures of two or more of them.

[0106] From the viewpoint of improving the appearance, feel, and antistatic properties of fibers used in artificial hair, ethylene oxide is the preferred ethylene oxide among the aforementioned ethylene oxides. In this case, the polymeric antistatic agent becomes a block polymer with a polyethylene oxide structure.

[0107] From the viewpoint of antistatic properties, the number-average molecular weight of the epoxide alkane adduct (a12) of bisphenol compounds is preferably 300 to 5000, and more preferably 500 to 4000.

[0108] From the viewpoint of the antistatic and heat-resistant properties of polyether ester amide, the ratio of (a12) based on the total weight of (a11) and (a12) is preferably 20 to 80% by weight, and more preferably 30 to 70% by weight.

[0109] Specifically, the following methods (1) and (2) can be used to prepare polyether ester amides, but there are no particular limitations.

[0110] Preparation method (1): The amide-forming monomer is reacted with dicarboxylic acid (molecular weight regulator) to form (a11), (a12) is added to it, and the polymerization reaction is carried out at high temperature (160-270°C) and reduced pressure (0.03-3 kPa).

[0111] Preparation method (2): The amide-forming monomer, dicarboxylic acid (molecular weight regulator) and (a12) are simultaneously added to the reaction tank and reacted under high temperature (160-270°C) and pressure (0.1-1 MPa) in the presence or absence of water to generate intermediate (a11), which is then polymerized with (a12) under reduced pressure (0.03-3 kPa).

[0112] From the perspective of reaction control, the preferred method among the above preparation methods is preparation method (1).

[0113] In addition to the methods described above, another method for preparing polyether ester amides is to replace the terminal hydroxyl group of (a12) with an amino or carboxyl group, and then react it with a polyamide having a carboxyl or amino group at the terminal.

[0114] As a method for replacing the terminal hydroxyl group of the epoxide alkane adduct (a12) of a bisphenol compound with an amino group, known methods can be cited, such as reducing the terminal cyanoalkyl obtained by cyanoalkylation of the hydroxyl group to an amino group [e.g., reacting (a12) with acrylonitrile and hydrogenating the resulting cyanoethyl compound].

[0115] As a method for replacing the terminal hydroxyl group of the epoxide alkane adduct (a12) of a bisphenol compound with a carboxyl group, examples include oxidation using an oxidizing agent [e.g., oxidizing the hydroxyl group of (a12) with chromic acid].

[0116] In the polymerization reaction described above, commonly used and known esterification catalysts can be used. Examples of such catalysts include antimony catalysts (antimony trioxide, etc.), tin catalysts (monobutyltin oxide, etc.), titanium catalysts (tetrabutyl titanate, etc.), zirconium catalysts (tetrabutyl zirconate, etc.), and metal acetate catalysts (zinc acetate, zirconyl acetate, etc.).

[0117] The amount of catalyst used is preferably 0.1 to 5% by weight, based on the total weight of (a11) and (a12), and more preferably 0.2 to 3% by weight from the viewpoint of reactivity and resin properties.

[0118] The polyether ester amide block copolymer is preferably a condensation product of a polyamide having carboxyl groups at both ends and a polyether glycol containing an aromatic ring. Specifically, the aromatic ring moiety of the polyether glycol containing the aromatic ring can be a residue selected from diphenols such as bisphenols, monocyclic diphenols, dihydroxybiphenyls, dihydroxynaphthalenes, and binaphthols. Preferably, the aromatic ring moiety is a bisphenol residue.

[0119] By incorporating aromatic rings into the aforementioned polyether glycol containing aromatic rings, the heat resistance of the polyether ester amide block copolymer is improved, making it easier to prevent decomposition and degradation during the spinning process. Furthermore, the melting point of the polyether ester amide block copolymer is easily adjusted to a temperature suitable for spinning.

[0120] The polyamides with carboxyl groups at both ends described above can be, for example, (1) lactam ring-opening polymers, (2) condensation polymers of aminocarboxylic acids, or (3) condensation polymers of dicarboxylic acids and diamines. These polyamides with carboxyl groups at both ends have, for example, a number average molecular weight of 500 to 5000, preferably 800 to 3000. If the number average molecular weight is less than 500, the heat resistance of the polyether ester amide itself decreases; if it is greater than 5000, the reactivity decreases, thus requiring a significant amount of time to manufacture the polyether ester amide.

[0121] The aforementioned aromatic polyether glycols can be, for example, polyether glycols produced by adding an epoxide to a glycol containing an aromatic ring. The molar amount of the epoxide added is typically 1 to 30 moles, preferably 2 to 20 moles each. The aforementioned aromatic polyether glycols have, for example, a number average molecular weight of 500 to 5000, preferably 800 to 3000. If the number average molecular weight is less than 500, the antistatic properties are insufficient; if it is greater than 5000, the reactivity decreases, thus requiring a considerable amount of time in the manufacture of polyether ester amides.

[0122] The polyether ester amide block copolymer preferably does not contain antistatic components such as metal salts including alkali metal or alkaline earth metal halides. When these components are present in amounts that enhance antistatic properties, they can transfer and precipitate onto the surface of the resulting artificial hair fibers, easily resulting in poor appearance of the artificial hair.

[0123] (Thermoplastic polyester)

[0124] The artificial hair fiber of the present invention preferably comprises a thermoplastic polyamide and a thermoplastic polyester that is incompatible with the thermoplastic polyamide and has a higher melting point. Here, incompatibility means that the two resins do not melt into a homogeneous resin. With this arrangement, the artificial hair fiber is formed into a material with a suppressed gloss, similar to natural hair. Specific examples of thermoplastic polyesters include polyethylene terephthalate and polybutylene terephthalate.

[0125] That is, in a preferred embodiment, the artificial hair fiber of the present invention comprises a thermoplastic polyamide forming a matrix, a thermoplastic polyester forming a regional structure, and the aforementioned polymeric antistatic agent, and has an uneven surface, wherein the protrusions of the uneven surface are formed by the thermoplastic polyamide. The regional structure of the polyester does not precipitate onto the fiber surface. Regarding the weight ratio of the thermoplastic polyamide to the thermoplastic polyester in the aforementioned artificial hair fiber, for example, the thermoplastic polyamide can account for more than half to all, preferably in the range of 70 / 30 to 95 / 5, more preferably in the range of 75 / 25 to 85 / 15.

[0126] <Manufacturing Method of Fibers for Artificial Hair>

[0127] The artificial hair fiber of the present invention, except that it contains the aforementioned polymeric antistatic agent in the thermoplastic polyamide, can be manufactured using the same method as conventional artificial hair fibers. The artificial hair fiber of the present invention can, for example, be manufactured according to the method described in Patent Document 1. The disclosure of Patent Document 1 is incorporated herein by reference.

[0128] Specifically, the artificial hair fiber of the present invention can be manufactured by the following operation: melting and mixing thermoplastic polyamide and polymeric antistatic agent at a melting temperature above their melting point, and extruding the melt-mixed resin at a discharge temperature below the above melting temperature to form a fiber.

[0129] In a preferred embodiment, the artificial hair fiber of the present invention can be manufactured by melting and mixing thermoplastic polyamide, polyester which is incompatible with thermoplastic polyamide and has a higher melting point, and a polymeric antistatic agent at a melting temperature above the melting point of the three components, and extruding the melt-mixed resin at a discharge temperature below the above melting temperature to form a fiber.

[0130] The general spinning apparatus using a single-screw extruder used in the manufacture of the synthetic fibers used in this invention is shown in Figure 1. Figure 1 The device comprises a hopper 1 for feeding resin, a barrel 2 for heating the fed resin, a screw 3 for melting and mixing the resin and then discharging it to a discharge section, and a gear pump 4 for feeding the molten resin to a spinneret 5. The molten resin is discharged from the spinneret 5 in filament form and then spun into fibers. It should be noted that the number of screws can be single-spindle or multi-spindle, and can be appropriately selected according to the characteristics of the resin and the fineness of the resulting fibers.

[0131] The spinning apparatus used in the manufacture of the synthetic fibers used in this invention generally employs, for example... Figure 1 or Figure 2 The single-screw or twin-screw extruder shown is configured to feed the molten and mixed resin to the spinneret head. Figure 1 The gear pump 4 used in the single-screw extruder shown is in Figure 2 It can be omitted in a twin-screw extruder. However, even like... Figure 2 Even with the gear pump removed, this configuration will not affect the formation of the protrusions on the surface of the artificial hair made of resin as the matrix. From the perspective of reducing the thermal degradation of the resin by shortening its residence time in the spinning device after molten mixing, this configuration is preferable. Figure 2 The system excluding the boost function.

[0132] The resins mixed in the given weight ratio within the above range are melted at a given temperature above the melting point of the thermoplastic polyester (this temperature is referred to as the melt setting temperature T1). Pigments and / or dyes may be added during the mixing process to color the mixture. Stabilizers, antioxidants, and / or UV absorbers may also be added, either directly into the spinning apparatus or into a masterbatch premixed with polyamide or polyester resins.

[0133] Thermoplastic resin supplied from hopper 1 is melted and fed from barrel 2 to spinneret head 5 via single-screw or twin-screw 3. The temperature of the molten resin is preferably the same as or higher than the set melting temperature T1; however, it can also be lower than the set melting temperature T1 as long as the molten resin does not solidify.

[0134] Figure 3The diagram shows a schematic of the spinneret head 5. Symbol 25 represents the resin discharge hole, symbol 26 represents the resin discharged from the discharge hole 25, symbol 27 represents a temperature sensor inserted into and located near the discharge port of the spinneret head 5, and T2 represents the temperature of the molten resin R before discharge, measured using this temperature sensor. Furthermore, the temperature of the molten resin before discharge is set as T2, and the resin discharge temperature of the spinneret head 5, i.e., the spinneret head set temperature, is set as T3.

[0135] When the mixed resin is compounded by a screw in the spinning device, heat is generally generated, causing the molten resin temperature T2 to be higher than the set melt temperature T1. However, if the molten resin temperature T2 before discharge is excessively higher than the set melt temperature T1, the formation of the protrusion of the first thermoplastic resin on the surface of the resin discharged from the spinneret 5 will be small or non-existent, which is undesirable. Conversely, if the molten resin temperature T2 before discharge is excessively lower than the set melt temperature T1, the viscosity of the mixed resin will increase and it will not flow, potentially preventing discharge, which is also undesirable.

[0136] The spinneret setting temperature T3 only needs to be set to a temperature lower than the molten resin temperature T2 near the outlet, preferably about 20-30°C lower than the molten resin setting temperature T1. If the temperature is higher than this range, it will be difficult to form an uneven surface on the discharged resin; conversely, if it is lower than this range, the resin will easily solidify, so this is not preferred.

[0137] More preferably, the spinneret setting temperature T3 is set below the melting point of the thermoplastic polyester. This spinneret setting temperature T3 is preferably lower than the melting point of the thermoplastic polyester in a range of 5°C to 30°C. More preferably, the spinneret setting temperature T3 is lower than the melting point of the thermoplastic polyester in a range of 10°C to 30°C. If the temperature is higher than this range, it is difficult to form an uneven surface on the discharged resin; conversely, if the temperature is lower than this range, the resin easily solidifies, which is therefore undesirable.

[0138] In addition, the spinneret used does not require a special structure; the synthetic fibers used in this invention can be adequately obtained using a spinneret with a known structure.

[0139] Figure 4 The diagram below represents a general outline of the process from spinning to winding fibers according to the present invention.

[0140] Under the above temperature conditions, the fibrous discharge resin 6 discharged from the spinneret head 5 by the gear pump 4 of the spinning device is air-cooled (ranges A, B and C in the figure), water-cooled in the cooling water tank 7, and then wound by the winding machine 9. Figure 4 The diagram shows a water-cooling process; alternatively, air cooling can be used to cool and wind the discharged resin 6. Alternatively, the spinning device can be configured as follows: Figure 2 The spinning device shown does not use a gear pump.

[0141] The molten resin discharged from the outlet 25 of the spinning device is fluid and can be stretched under tension. However, as the discharged resin cools, it undergoes solidification, reducing its fluidity, and thus cannot be stretched without heating. The stretching flow range is defined as the state in which the resin discharged from the outlet 25 can be stretched under tension generated at a set winding speed. The stretching flow range is not constant and varies depending on the resin used, the set temperature of the spinneret, the temperature of the location where the spinning device is installed, and the winding speed.

[0142] When the spinneret setting temperature T3 is set below the melt setting temperature T1, the zone structure does not precipitate onto the fiber surface; instead, it is covered by the resin components of the matrix, or small protrusions formed by the matrix components appear on the fiber surface. In particular, if the spinneret setting temperature T3 is below the melting point of the zone structure components, a large number of small protrusions covered by the matrix are formed.

[0143] The wound synthetic fibers pass through the stretching rollers and dry heat tank of the stretching device and are stretched to a given filament diameter, such as 80 μm. Alternatively, the spinning device can be connected to the stretching device to perform the spinning and stretching processes continuously.

[0144] <Uses such as wigs>

[0145] Multiple stretched artificial hair fibers are implanted into a wig base to create a wig. The wig base can be a mesh base, an artificial skin base, or a combination of both. Additionally, the stretched artificial hair fibers can be used for hair augmentation or as hair replacement.

[0146] The invention is further illustrated by the following embodiments, but the invention is not limited thereto.

[0147] Example

[0148] The following polyether ester amide block copolymer is prepared as a polymeric antistatic agent.

[0149] [Table 1]

[0150]

[0151] [Table 2]

[0152]

[0153] <Example 1>

[0154] Prepare "VESTAMIDD-18" (trade name, melting point 200-225℃, MFR 25.8g (240℃, 21.18N)) manufactured by Daicel-Evonik Co., Ltd. as a thermoplastic polyamide (hereinafter referred to as "PA") and "Vylopet BR-3067" (trade name, melting point 255℃) manufactured by Toyobo Co., Ltd. as a thermoplastic polyester (hereinafter referred to as "PE"), in an amount such that the PA / PE ratio is 85 / 15. Prepare an antistatic agent A (hereinafter referred to as "Agent A") in an amount of 1% by weight and a colorant in an amount of 0.49% by weight, based on the resin composition.

[0155] Use the prepared raw materials, Figure 4 The spinning apparatus and stretching apparatus (not shown) shown produce fibers for artificial hair. It should be noted that in the following manufacturing conditions, T1 is the melt set temperature, T2 is the molten resin temperature near the spinneret, and T3 is the spinneret set temperature.

[0156] (Manufacturing conditions)

[0157] T1 / T2 / T3 (°C): 280 / 248 / 248

[0158] Spinning discharge rate (kg / h): 0.4

[0159] Cooling water temperature (°C): 5

[0160] Spinning traction speed (m / min): 120

[0161] Room temperature (°C) in the experimental setting: 26

[0162] Stretch ratio (times): 4.4

[0163] Tensile temperature (°C, air): 90, 190

[0164] Artificial hair was made by bundling 2g of fibers together to form a hair bundle. The artificial hair was then sewn using a sewing machine. The resulting artificial hair was immersed in a silicone aqueous solution (silicone:water / 1:60), spread on a similarly impregnated nonwoven fabric, and then wound onto a 35mm aluminum tube, which was then covered with aluminum foil from above. The bundle was then heat-treated at 180℃ for 2 hours to further curl it. The curled hair bundle was placed on a flat surface to form a circle. The diameter (mm) of the inner circumference of the circle formed by the hair bundle was measured. This value was set as the curl dimension. The measurement results are shown in Table 3.

[0165] <Examples 2-90>

[0166] Except for changes to the PA / PE ratio, the type and amount of antistatic agent, and T2 and T3, artificial hair fibers were manufactured in the same manner as in Example 1. An enlarged image of the artificial hair fibers of Example 16 is shown below. Figure 5 and Figure 6 middle. Figure 5 This is an 800x magnified image of the surface of fibers used to represent artificial hair. Figure 6 This is a 1000x magnified image showing a cross-section of fibers used in artificial hair. Based on... Figure 5 It is known that the surface of the fibers used in artificial hair has irregularly protruding convex bodies, forming an uneven surface. According to... Figure 6 It is known that the morphology of artificial hair fibers is an island structure in which the island portion of polyester is roughly uniformly dispersed in the sea portion of polyamide.

[0167] The same method as in Example 1 was used to prepare hair bundles of the manufactured artificial hair fibers, which were then rolled up, and the curl diameter (mm) was measured. The results are shown in Tables 3 to 14.

[0168] [Table 3]

[0169]

[0170] [Table 4]

[0171]

[0172] [Table 5]

[0173]

[0174] [Table 6]

[0175]

[0176] [Table 7]

[0177]

[0178] [Table 8]

[0179]

[0180] [Table 9]

[0181]

[0182] [Table 10]

[0183]

[0184] [Table 11]

[0185]

[0186] [Table 12]

[0187]

[0188] [Table 13]

[0189]

[0190] [Table 14]

[0191]

[0192] <Comparative Examples 1-6>

[0193] Except for the absence of an antistatic agent, the artificial hair fibers of Comparative Examples 1 to 6 were manufactured in the same manner as those of Examples 1, 3, 5, 7, 9 and 11, respectively. The fibers were then wound, and the curl diameter (mm) was measured. The results are shown in Table 15.

[0194] [Table 15]

[0195]

[0196] Compared to the synthetic hair fibers manufactured under the same manufacturing conditions (excluding the antistatic agent), the synthetic hair fibers of the comparative example without antistatic agents exhibited a larger curl diameter and poorer curling performance. It should be noted that, after changing the manufacturing conditions, the following trends were observed in the curling performance of the manufactured synthetic hair fibers.

[0197] [Table 16]

[0198] Manufacturing conditions Effect of winding performance Types of antistatic agents Agent B has smaller curl (higher) > Agent D > Agent C > Agent A > Agent E has larger curl (lower). Amount of antistatic agent 5% small curl (high) > 0% large curl (low) T2 and T3 temperatures At 248℃, curling is smaller (higher) than at 250℃, curling is larger (lower). PA / PB ratio 75 / 25 small curl (high) > 81 / 19 > 85 / 15 large curl (low)

[0199] Furthermore, observations of the manufactured synthetic hair fibers yielded the following insights: The color tone was whiter when using agent A compared to agent B. The shine was emphasized at a PA / PE ratio of 85 / 15. The hair texture was coarser when the PA / PE ratio was 75 / 25. The shine was emphasized when T2 and T3 were set to 250°C compared to 248°C.

[0200] <Example 91>

[0201] Except for changing the amount of antistatic agent used, artificial hair fibers were manufactured in the same manner as in Example 4 (PA / PE ratio 81 / 19, agent B 1%, T2, T3 (°C) 248), and hair bundles were made and curled. The curled hair bundles were combed 10 times using a Denman type metal comb. The amount of static electricity carried by the hair bundles and the curl diameter (mm) of the hair bundles were measured using a static electricity meter "FMX-004" (trade name) manufactured by SIMCO JAPAN.

[0202] Apply AD&F PRO STYLING shampoo (trade name) to the entire hair strand, then rinse with water to clean the hair strand, and blow-dry it with air at approximately 60°C. Comb the dried hair strand 10 times and measure the amount of static electricity and the curl diameter (mm) of the hair strand (rinse 1 time).

[0203] Repeat the washing and drying process 4 times, and comb the hair 10 times. Measure the static electricity level and curl diameter (mm) of each hair stalk (washing 5 times). Repeat the washing and drying process 5 times, and comb the hair stalk 10 times. Measure the static electricity level and curl diameter (mm) of each hair stalk (washing 10 times). The results are shown in Tables 17-20.

[0204] [Table 17]

[0205]

[0206] [Table 18]

[0207]

[0208] [Table 19]

[0209]

[0210] [Table 20]

[0211]

[0212] The curl diameter of synthetic hair fibers that do not contain antistatic agents increases significantly from the first wash, and the curl retention is poor when washed repeatedly.

[0213] <Examples 92-94>

[0214] Except for changes to the PA / PE ratio, the type and amount of antistatic agent, and T2 and T3, artificial hair fibers were manufactured in the same manner as in Example 1. Hair bundles of the manufactured artificial hair fibers were made in the same manner as in Example 1, rolled, and the curl diameter (mm) was measured. The results are shown in Table 21.

[0215] [Table 21]

[0216]

[0217] <Examples 98-103>

[0218] Except for replacing PA and PE and using only PA as the resin component, and changing the type and amount of antistatic agent, as well as T2 and T3, artificial hair fibers were manufactured in the same manner as in Example 1. Hair bundles of the manufactured artificial hair fibers were made in the same manner as in Example 1, rolled, and the curl diameter (mm) was measured. The results are shown in Table 22.

[0219] [Table 22]

[0220]

[0221] <Comparative Examples 7 and 8>

[0222] Except for the absence of an antistatic agent, the artificial hair fibers of Comparative Examples 7 and 8 were manufactured in the same manner as in Examples 98 and 101, respectively, and were wound to measure the curl diameter (mm). The results are shown in Table 23.

[0223] [Table 23]

[0224]

[0225] <Example 104>

[0226] The curled hair strands obtained in Examples 92-94, 98-100 and Comparative Example 7 were combed 10 times using a Denman type metal comb. The amount of static electricity on the hair strand and the curl diameter (mm) of the hair strand were measured using a static electricity meter “FMX-004” (trade name) manufactured by SIMCO JAPAN.

[0227] Apply AD&F PRO STYLING shampoo (trade name) to the entire hair strand, then rinse with water to clean the hair strand, and blow-dry it with air at approximately 60°C. Comb the dried hair strand 10 times and measure the amount of static electricity and the curl diameter (mm) of the hair strand (rinse 1 time).

[0228] The washing and drying process was repeated 4 times, followed by 10 combing sessions. The static electricity level and curl diameter (mm) of each hair strand were measured (5 washes). The washing and drying process was then repeated 5 times, followed by 10 combing sessions. The static electricity level and curl diameter (mm) of each hair strand were measured (10 washes). The results are shown in Tables 24 and 25. It should be noted that in Tables 24 and 25, the values ​​after PA and PE represent the weight ratio of their respective components when the weight of the artificial hair fiber is set to 100.

[0229] [Table 24]

[0230]

[0231] [Table 25]

[0232]

[0233] Explanation of reference numerals in the attached figures

[0234] 1. Hopper, 2. Barrel, 3. Screw, 4. Gear pump, 5. Spinneret, 6. Resin discharge, 7. Cooling water tank, 8. Guide roller, 9. Winding machine, 25. Resin discharge hole, 26. Post-discharge resin, 27. Temperature sensor.

Claims

1. A synthetic hair fiber comprising a thermoplastic polyamide and a polymeric antistatic agent having compatibility with said thermoplastic polyamide. The polymeric antistatic agent has a melting point below that of the thermoplastic polyamide. The thermoplastic polyamide has a melting point of 170℃ to 270℃. The polymeric antistatic agent is selected from condensates of polyamides with carboxyl groups at both ends and polyethylene glycol containing aromatic rings, and block copolymers having polyethylene oxide blocks and polyolefin blocks. The artificial hair fiber also comprises a thermoplastic polyester that is incompatible with thermoplastic polyamide and has a higher melting point.

2. The artificial hair fiber according to claim 1, wherein, The polymeric antistatic agent has a melting point of 160℃ to 250℃.

3. The artificial hair fiber according to claim 1, wherein, The polymeric antistatic agent has a melt flow rate of 10 g / 10 min to 40 g / 10 min at 215 °C.

4. The artificial hair fiber according to claim 1, wherein, The polymeric antistatic agent has 10 6 Ω / □~10 10 The inherent surface resistance value of Ω / □.

5. The artificial hair fiber according to claim 1, wherein, The polymeric antistatic agent is contained in an amount of 0.5% to 10% by weight.

6. The artificial hair fiber according to any one of claims 1 to 5, having a weight ratio of thermoplastic polyamide to thermoplastic polyester of 75 / 25 to 85 / 15.

7. The artificial hair fiber according to any one of claims 1 to 5, having an uneven shape formed on its surface, wherein the protrusions of the uneven shape comprise particles of thermoplastic polyester.

8. The artificial hair fiber according to any one of claims 1 to 5, having a matrix comprising thermoplastic polyamide and a regional structure comprising thermoplastic polyester.

9. The synthetic hair fiber according to any one of claims 1 to 5, wherein, The thermoplastic polyamide is at least one thermoplastic resin selected from linear saturated aliphatic polyamide, alternating copolymers of hexamethylenediamine and terephthalic acid, and alternating copolymers of m-phenylenediamine and adipic acid.

10. The synthetic hair fiber according to any one of claims 1 to 5, wherein, The thermoplastic polyester is at least one thermoplastic resin selected from polyethylene terephthalate and polybutylene terephthalate.

11. A wig having a wig base and artificial hair fibers of any one of claims 1 to 10 implanted in said wig base.

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