JP2017122291A - Polyester fiber for artificial hair and head decoration product including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester fiber for artificial hair having heat resistance and flame retardance and yet having excellent texture and durability, and a head decoration product including the polyester fiber for the artificial hair.SOLUTION: The polyester fiber for artificial hair according to the present invention is formed of a polyester resin composition, and the polyester resin composition includes 5-40 pts.wt. of brominated epoxy-based flame retardant with respect to 100 pts.wt. of polyester resin. The polyester resin is one type or more selected from a group consisting of polyalkylene terephthalate and a copolymerized polyester primarily composed of the polyalkylene terephthalate. The polyester fiber for the artificial hair has (stress at 5% elongation)/(elastic modulus at 1% elongation) measured in a tensile test of monofilament of not less than 2.0×10and not more than 5.0×10and Young's modulus of 8.0 GPa or less. The head decoration product is characterized in including the polyester fiber for the artificial hair.SELECTED DRAWING: None

Description

  The present invention relates to a polyester-based fiber for artificial hair that can be used as artificial hair and a headdress product including the same.

  Conventionally, human hair and artificial hair have been used in hair ornament products such as wigs, hair wigs, furs, hair bands, doll hairs. In recent years, the acquisition of human hair has become increasingly difficult, and for example, the importance of artificial hair fibers such as acrylic fibers such as modacrylic fibers, polyvinyl chloride fibers, and polyester fibers has been increasing. Among artificial hair fibers, polyester fibers have higher heat resistance temperature than modacrylic fibers and polyvinyl chloride fibers, and therefore, polyester fibers are used as artificial hair fibers from the viewpoint of heat resistance. However, when using polyester fibers as artificial hair fibers, it has become necessary to impart flame retardancy from the viewpoint of safety. Therefore, various attempts to improve the flame retardancy of polyester fibers have been proposed. For example, Patent Documents 1 to 3 propose a method of copolymerizing a flame retardant monomer containing a phosphorus atom in a polyester resin. Patent Documents 4 to 7 propose a method of incorporating a flame retardant into a polyester fiber.

  On the other hand, the synthetic fiber for artificial hair that constitutes a headdress product is required to have a tactile sensation similar to human hair so that a sense of incongruity does not occur when the headdress product is worn. Furthermore, since head ornament products generally live in a state where they are worn, the artificial hair fibers constituting the head ornament products are damaged and the fibers are deformed, resulting in a decrease in quality. In particular, in synthetic fibers such as polyester-based fibers, quality deterioration due to deformation of fibers in use is remarkable, and it is desired to improve durability and suppress fiber deformation.

Japanese Patent Publication No. 55-41610 Japanese Patent Publication No.11-124732 Japanese Patent Publication No. 3-27105 Japanese Patent Publication No. 3-57990 Japanese Patent Publication No. 1-2913 JP 2006-144221 A WO2006 / 035868

  In order to solve the above-described conventional problems, the present invention provides a polyester fiber for artificial hair that has heat resistance and flame retardancy and is excellent in touch and durability, and a headwear product including the same.

The present invention is a polyester fiber for artificial hair formed of a polyester resin composition, and the polyester resin composition contains 5 to 40 parts by weight of a brominated epoxy flame retardant with respect to 100 parts by weight of the polyester resin. The polyester resin is one or more selected from the group consisting of a polyalkylene terephthalate and a copolyester mainly composed of polyalkylene terephthalate, and the polyester fiber for artificial hair was measured in a single fiber tensile test, (Stress at 5% elongation) / (Elastic modulus at 1% elongation) is 2.0 × 10 ⁻² or more and 5.0 × 10 ⁻² or less and Young's modulus is 8.0 GPa or less. The present invention relates to a polyester fiber for artificial hair.

  The polyester resin composition further includes 0.1 part by weight of one or more antimony compounds selected from the group consisting of antimony trioxide, antimony tetraoxide, antimony pentoxide, and sodium antimonate with respect to 100 parts by weight of the polyester resin. It is preferable to contain 7 parts by weight or less. The polyester resin is preferably at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate and polytrimethylene terephthalate.

  The present invention also relates to a head ornament product comprising the polyester-based fiber for artificial hair.

  The head decoration product may be any one selected from the group consisting of hair wigs, wigs, weaving, hair extensions, blade hair, hair accessories, and doll hair.

  INDUSTRIAL APPLICABILITY The present invention can provide a polyester fiber for artificial hair that has heat resistance and flame retardancy and is excellent in touch and durability, and a headwear product including the same.

As a result of intensive studies to solve the above-mentioned problems, the present inventors used a brominated epoxy flame retardant as a flame retardant and measured it in a single fiber tensile test (stress at 5% elongation) / (Elastic modulus at 1% elongation) is set to 2.0 × 10 ⁻² or more and 5.0 × 10 ⁻² or less, and Young's modulus is set to 8.0 GPa or less to have heat resistance and flame retardancy. On the other hand, the inventors have found that polyester fibers for artificial hair having excellent tactile sensation and durability can be obtained, and have completed the present invention.

The polyester fiber for artificial hair has a (stress at 5% elongation) / (elastic modulus at 1% elongation) of 2.0 × 10 ⁻² or more and 5.0 × 10 5 as measured in a single fiber tensile test. ⁻² or less, preferably 2.1 × 10 ⁻² or more and 3.5 × 10 ⁻² or less. In the present invention, (stress at 5% elongation) / (elastic modulus at 1% elongation) means that the shape is difficult to recover when an external force is applied to the polyester fiber for artificial hair, and the hair tip is easily deformed. It is an index indicating the degree of safety. When (stress at 5% elongation) / (elastic modulus at 1% elongation) is less than 2.0 × 10 ⁻² , the shape is difficult to recover when an external force is applied, the hair tip is easily deformed, and durability is high. Deteriorate. This is because when the amount of strain due to bending of artificial hair is considered, the maximum strain applied to the outer periphery of the fiber for artificial hair is around 5%, so the stress at 5% elongation is the initial elastic modulus, that is, 1% elongation. nearer fibers to a value obtained by normalizing the 5.0 × 10 ^-2 in elastic modulus will exhibit an elastic response, it is for plastically response becomes stronger as distance from 5.0 × 10 ^-2 of It is guessed.

  In the present invention, durability can be evaluated by pilling resistance. The pilling resistance is an index indicating the difficulty of pilling. The pilling in the hair means that the fiber is deformed to draw a circle when rubbed with a comb or the like. Those with high durability are hard to deform when force is applied, so the outer diameter of the circle is large and the billing resistance is high. The pilling resistance is evaluated as described later.

  The polyester fiber for artificial hair has a Young's modulus of 8.0 GPa or less, preferably 2.0 GPa or more and 7.5 GPa or less, more preferably 2.5 GPa or more and 7. 0 GPa or less. When the Young's modulus exceeds 8.0 GPa, the polyester fiber becomes hard and a tactile sensation different from human hair is obtained. When the Young's modulus is within the above range, the tactile sensation becomes soft and the durability, that is, the pilling resistance also becomes good.

  The polyester fiber for artificial hair of the present invention is a fiber formed of a polyester resin composition. Usually, polyester fiber for artificial hair can be formed by melt spinning the polyester resin composition. The polyester resin composition is usually melt-kneaded and then melt-spun.

  The polyester resin composition includes a polyester resin and a brominated epoxy flame retardant. By including a brominated epoxy flame retardant, the polyester fiber for artificial hair has flame retardancy and tends to be soft with a feel close to that of human hair.

  The polyester resin is at least one selected from the group consisting of a polyalkylene terephthalate and a copolyester mainly composed of polyalkylene terephthalate. The polyalkylene terephthalate is not particularly limited, and examples thereof include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polycyclohexanedimethylene terephthalate. The copolyester mainly composed of the polyalkylene terephthalate is not particularly limited. For example, the main component is a polyalkylene terephthalate such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexanedimethylene terephthalate, and other copolymer components. And a copolyester containing. In the present invention, “main body” means containing 80 mol% or more.

  Examples of the other copolymerization components include isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, trimellitic acid, pyromellitic acid, succinic acid, glutaric acid, adipic acid, superic acid, and azelaic acid. Polycarboxylic acids such as sebacic acid and dodecanedioic acid and derivatives thereof; dicarboxylic acids including sulfonic acid salts such as 5-sodium sulfoisophthalic acid and dihydroxyethyl 5-sodium sulfoisophthalate; -Propanediol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, polyethylene glycol, trimethylolpropane, pentaerythritol 4-hydroxybenzoic acid, ε- caprolactone.

  Specific examples of the copolyester mainly composed of the polyalkylene terephthalate include, for example, polyethylene terephthalate as a main component, bisphenol A ethylene glycol ether, 1,4-cyclohexanedimethanol, isophthalic acid and 5-sodium sulfoisophthalic acid dihydroxy. Examples thereof include polyesters obtained by copolymerizing one compound selected from the group consisting of ethyl.

  The polyalkylene terephthalate and the copolyester mainly composed of the polyalkylene terephthalate may be used alone or in combination of two or more. Above all, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene terephthalate, polyester copolymerized with bisphenol A ethylene glycol ether, polyester mainly composed of polyethylene terephthalate, polyester copolymerized with 1,4-cyclohexanedimethanol, polyethylene It is preferable to use a polyester mainly composed of terephthalate and copolymerized with isophthalic acid and a polyester mainly composed of polyethylene terephthalate and copolymerized with dihydroxyethyl 5-sodiumsulfoisophthalate alone or in combination of two or more.

  The intrinsic viscosity (IV value) of the polyester resin is not particularly limited, but is preferably 0.3 to 1.2, and more preferably 0.4 to 1.0. When the intrinsic viscosity is less than 0.3, the mechanical strength of the obtained fiber tends to be lowered, and there is a risk of drip during the combustion test. On the other hand, if the intrinsic viscosity exceeds 1.2, the melt viscosity increases with increasing molecular weight, and melt spinning tends to be difficult and the fineness tends to be non-uniform.

  Although the brominated epoxy flame retardant is not particularly limited, for example, a compound represented by the following general formula (1) is preferable.

  However, in the said General formula (1), m is 1-1000. Among these, m is preferably from 2 to 500, and more preferably from 3 to 100, from the viewpoints of color developability and gloss.

  The polyester resin composition contains 5 to 40 parts by weight of a brominated epoxy flame retardant with respect to 100 parts by weight of the polyester resin. When the addition amount of the brominated epoxy flame retardant is less than 5 parts by weight, it is difficult to obtain a flame retardant effect and it is difficult to obtain a soft tactile sensation. On the other hand, if it exceeds 40 parts by weight, the mechanical properties, heat resistance and drip resistance may be impaired. The polyester resin composition preferably contains 6 to 30 parts by weight, more preferably 8 to 25 parts by weight of a brominated epoxy flame retardant with respect to 100 parts by weight of the polyester resin.

  In the polyester fiber for artificial hair of the present invention, the brominated epoxy flame retardant may be present in the form represented by the following general formula (2), for example.

  However, in the said General formula (2), R1 and R2 are the functional groups represented by following Chemical formula (3)-(5) and General formula (6), (7), and may be the same respectively. May be different. Moreover, in the following general formula (6) and (7), n is 1-200.

  The polyester resin composition preferably further contains 0.1 to 7 parts by weight of antimony compound, more preferably 0.5 to 4 parts by weight, more preferably 0.5 to 3 parts per 100 parts by weight of the polyester resin. It is more preferable to include parts by weight. In the present invention, the antimony compound has an effect of further improving the flame retardancy of the polyester fiber for artificial hair, and is appropriately used when it is necessary to increase the flame retardancy.

  The antimony compound is not particularly limited, and examples thereof include antimony trioxide, antimony tetraoxide, antimony pentoxide, and sodium antimonate. These may be used alone or in combination of two or more. Note that there is no problem even if the antimony compound reacts with a halogen element or a phosphorus element during melt-kneading to change to another compound. In addition, the antimony compound preferably has a small particle size from the viewpoint of spinnability and color development, and the average particle size is preferably 5 μm or less, more preferably 2 μm or less. Here, the average particle diameter refers to a median diameter (d50) measured by a laser diffraction particle size distribution measurement method.

  The polyester fiber for artificial hair of the present invention can be obtained by melt spinning the polyester resin composition by a normal melt spinning method. The polyester resin composition can be obtained by dry blending each component such as the above-described polyester resin and brominated epoxy flame retardant and then melt-kneading using various general kneaders. Examples of the kneader include a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, and a kneader. Among these, a twin screw extruder is preferable from the viewpoint of adjusting the degree of kneading and ease of operation.

  When the polyester fiber for artificial hair of the present invention is melt-spun by a normal melt spinning method, for example, the temperature of an extruder, a gear pump, a die, etc. is set to 250 to 310 ° C., and the polyester resin composition is melt-spun. Then, after passing the spun yarn through a heating tube, the spun yarn (undrawn yarn) is obtained by cooling to a temperature below the glass transition point of the polyester resin and taking it up at a speed of 50 to 5000 m / min. The spun yarn may be cooled in a water tank containing cooling water to control the fineness. The temperature and length of the heating cylinder, the temperature and blowing amount of the cooling air, the temperature of the cooling water tank, the cooling time and the take-up speed can be adjusted as appropriate depending on the amount of polymer discharged and the number of holes in the die.

  In the present invention, the obtained spun yarn (undrawn yarn) is preferably heat drawn. Stretching may be performed by any of a two-step method in which a spun yarn is once wound and then stretched, or a direct spin-stretching method in which a spun yarn is continuously stretched without being wound. The thermal stretching is performed by a one-stage stretching method or a multi-stage stretching method having two or more stages. As a heating means in the heat stretching, a heating roller, a heat plate, a steam jet device, a hot water tank, or the like can be used, and these can be used in combination as appropriate. The draw ratio is preferably in the range of 2 to 5 times, more preferably 3 to 5 times, and even more preferably 3 to 4.5 times. If the draw ratio is less than 2 times, sufficient strength and heat resistance are difficult to obtain, and if it exceeds 5 times, thread breakage or fluffing may occur, or the fibers may be whitened to deteriorate the hue.

  In the present invention, by appropriately adjusting the production conditions such as the type of polyester resin, the amount of each component in the polyester resin composition, and the draw ratio in melt spinning, (stress at 5% elongation) / (at 1% elongation) Elastic modulus) and Young's modulus can be in a predetermined range.

  In the polyester fiber for artificial hair of the present invention, flame retardant other than brominated epoxy flame retardant, light stabilizer, fluorescent agent, antioxidant, Various additives such as an antistatic agent, a pigment, a plasticizer, and a lubricant can be contained. By incorporating a pigment, a primary fiber can be obtained. Furthermore, oil agents such as a fiber surface treatment agent and a softening agent can be used to adjust the feel and feel to make it closer to human hair.

  The polyester fiber for artificial hair of the present invention is preferably a non-crimp raw fiber. Further, from the viewpoint of being suitable for artificial hair, the fineness is preferably 10 to 100 dtex, more preferably 20 to 90 dtex, and still more preferably 35 to 80 dtex.

  The polyester fiber for artificial hair of the present invention has the original physical properties of a polyester fiber and is excellent in heat resistance, flame retardancy, touch and durability. Moreover, it is excellent in curl setting using a beauty heat appliance (such as a hair iron), and is excellent in curl retention. Moreover, it is preferable that color developability and combing are also good. Moreover, it is preferable that it is hard to ignite and has a self-extinguishing property. Further, by adding a dulling agent as necessary, it is possible to give unevenness to the fiber surface, and it is appropriately matted and can be used more suitably as artificial hair. The heat resistance and flame retardancy of the polyester fiber for artificial hair can be measured as described later.

  When the polyester fiber for artificial hair of the present invention is attached to the original fiber, it can be used as it is, but when it is not attached, it can be dyed under the same conditions as those for a normal polyester fiber. As pigments, dyes, auxiliaries and the like used for dyeing, those having weather resistance and flame retardancy are preferable.

  The polyester fiber for artificial hair of the present invention can be used alone as artificial hair as it is. Alternatively, it can be used as artificial hair in combination with other synthetic fibers for artificial hair such as modacrylic fiber, polyvinyl chloride fiber and nylon fiber, and natural fibers such as human hair and animal hair.

  The head ornament product containing the polyester fiber for artificial hair of the present invention is excellent in heat resistance, flame retardancy, touch and durability. The head decoration product is not particularly limited, and examples thereof include hair wigs, wigs, weaving, hair extensions, blade hairs, hair accessories, and doll hairs.

  The head ornament product may be formed only of the polyester fiber for artificial hair of the present invention. The headdress product is a combination of the synthetic fiber for artificial hair of the present invention and other synthetic fibers for artificial hair such as modacrylic fiber, polyvinyl chloride fiber and nylon fiber, and natural fibers such as human hair and animal hair. May be formed.

  Human hair used for hair ornaments such as wigs, hair wigs, and hair extensions is generally treated with cuticles, decolored, and dyed. Because it uses a softening agent, it is flammable unlike untreated human hair, but it is good when the polyester fiber for artificial hair of the present invention and human hair are mixed at a human hair mixing ratio of 60% or less. Show flame retardancy.

  Hereinafter, the present invention will be described more specifically based on examples. The present invention is not limited to these examples.

(Examples 1-9, Comparative Examples 1-4)
A polyester resin, brominated epoxy flame retardant, and antimony compound dried to a water content of 100 ppm or less were dry blended in the ratios shown in Table 1. Next, it was supplied to a twin screw extruder, melted and kneaded at 280 ° C., pelletized, and dried to a water content of 100 ppm or less. Next, using a melt spinning machine, the molten polymer is discharged from a spinneret having a round cross-section nozzle hole with a nozzle diameter of 0.5 mm at 280 ° C., cooled to below the glass transition temperature by air cooling, and a speed of 60 to 150 m / min. To obtain a spun yarn. The obtained spun yarn is stretched at 85 ° C. at a predetermined draw ratio shown in Table 1, and heat-treated using a heat roll heated to 200 ° C., and a polyester fiber having a single fiber fineness of about 65 dtex. (Multifilament) was obtained.

The compounds used in Examples and Comparative Examples were as follows.
Polyester resin 1: polyethylene terephthalate, manufactured by Mitsubishi Chemical Corporation, IV value = 0.83, trade name “BK-2180”
Polyester resin 2: Polybutylene terephthalate, manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name “Novaduran 5020”
Polyester resin 3: Polytrimethylene terephthalate, manufactured by DuPont, trade name “Sorona 3301 NC010”
Brominated epoxy flame retardant 1: terminal epoxy group type brominated epoxy flame retardant, manufactured by Sakamoto Pharmaceutical Co., Ltd., molecular weight of about 30000, trade name “SR-T2MP”
Brominated epoxy flame retardant 2: terminal epoxy group type brominated epoxy flame retardant, manufactured by Sakamoto Yakuhin Kogyo Co., Ltd., molecular weight of about 10,000, trade name “SR-T5000”
Antimony compound: sodium antimonate, manufactured by Nippon Seiko Co., Ltd., trade name “SA-A”

  The ratio of the stress at 5% elongation to the elastic modulus at 1% elongation (stress at 5% elongation) / (elastic modulus at 1% elongation) of the fibers obtained in Examples and Comparative Examples is as follows: Measured and calculated. Further, the strength, elongation and Young's modulus were measured and calculated as follows. Moreover, tactile sensation, heat resistance and pilling resistance were evaluated as follows. Moreover, the flame retardance was evaluated by measuring the LOI value and the after flame time by the combustion test as described below. These results are shown in Table 1 below.

<(Stress at 5% elongation) / (Elastic modulus at 1% elongation)>
Using a tensile / compression tester (INTESCO Model 201 type, manufactured by Intesco), a filament tensile test was performed as follows. First, take one filament (single fiber) with a length of 40 mm, sandwich 10 mm of both ends of the filament with a double-sided tape (thin paper) with glue attached, and let it air dry overnight. A sample of was prepared. Next, the sample was mounted on a tensile / compression tester, and the test was performed at a temperature of 24 ° C., a relative humidity of 80% or less, a load of 0.038 gf × fineness (dtex), and a tensile speed of 20 mm / min to obtain a stress strain curve. The test was repeated 10 times under the same conditions, and (stress at 5% elongation) / (elastic modulus at 1% elongation) was calculated from the averaged stress strain curve.

<Strength, elongation and Young's modulus>
The tensile strength / elongation of the filament was measured using a tensile / compression tester (manufactured by Intesco, INTERSCO Model 201 type). Take one filament (single fiber) with a length of 40 mm, sandwich 10 mm of both ends of the filament with a backing sheet (thin paper) to which a double-sided tape with glue attached is applied, and let it air dry overnight. Make it. A sample is mounted on a testing machine, a test is performed at a temperature of 24 ° C., a relative humidity of 80% or less, a load of 0.038 gf × fineness (dtex), and a tensile speed of 20 mm / min, and the tensile strength and elongation at break are measured. Young's modulus was obtained from the initial gradient. The test was repeated 10 times under the same conditions, and the average value was defined as the strength, elongation, and Young's modulus of the single fiber.

<LOI value>
The LOI value was measured according to JIS L 1091 E method (oxygen index method test). Specifically, both ends of the filament (length 16 cm, weight 0.25 g) were lightly gathered with a double-sided tape, and sandwiched and twisted with a suspender. When it was fully twisted, it was folded in half in the middle. Both ends of the twisted filament were fixed with cellophane (registered trademark) tape so that the total length was 7 cm. The obtained sample was pre-dried at 105 ° C. for 60 minutes, and further dried with a desiccator for 30 minutes or more. The dried sample was adjusted so as to have a predetermined oxygen concentration, and after 40 seconds, a gas igniter with a flame length reduced to 8 to 12 mm was ignited from above, and the igniter was released after ignition. The oxygen concentration that burned 5 cm or more or continued burning for 3 minutes or more was examined, and the test was repeated three times under the same conditions to obtain the limiting oxygen index (LOI).

<Combustion test>
Both ends of the filament (length: 40 cm, fineness: about 6500 dtex, about 100) were lightly collected with a double-sided tape, and sandwiched and twisted with a suspender. When it was fully twisted, it was folded in half in the middle. Both ends of the twisted filaments were fixed with cellophane (registered trademark) tape so that the total length was 20 cm. The center of the obtained sample was sandwiched with tweezers, a 20 mm flame was applied to the filament and burned, and the afterflame time was measured. Based on the afterflame time, the flammability was evaluated according to the following four criteria.
A: The after flame time is 2 seconds or less, and the flammability is quite good.
B: The after flame time is 3 seconds or more and less than 5 seconds, and the combustibility is good.
C: The after flame time is 5 seconds or more and less than 9 seconds, and the flammability is slightly poor.
D: The after flame time is 9 seconds or more, and the combustibility is poor.

<Tactile sense>
Sensory evaluation was performed by comparison with human hair, and the evaluation was made according to the following four-stage criteria.
A: Very soft texture equivalent to human hair B: Soft texture resembling human hair C: Slightly hard texture compared to human hair D: Hard texture compared to human hair

<Heat resistance>
The filament (30 cm in length, 5 g in weight) was pinched with a hair iron heated to 180 ° C., and 30 cm was slid for 5 seconds, and the fusion and shrinkage between the filaments were observed visually. The evaluation was made according to the following four criteria.
A: There is no fusion and shrinkage, and the heat resistance is quite good.
B: There is slight fusion or shrinkage, and heat resistance is good.
C: There is fusion or shrinkage, and the heat resistance is slightly poor.
D: There is fusion and shrinkage, and the heat resistance is poor.

<Pilling resistance>
The pilling resistance was evaluated as a durability index. The pilling resistance is an index indicating the difficulty of pilling. The pilling in the hair means that the fiber is deformed to draw a circle when rubbed with a comb or the like. A fiber obtained by rubbing one filament (single fiber, fiber length 35 cm) with a weight of 20 g suspended at one end on a steel clip having a diameter of 1.21 mm at a speed of 20 mm / sec at an angle of 42 °. The outer diameter of the drawn circle was measured, and the average value of the outer diameters of 10 single yarns was defined as the pilling diameter. Those with high durability are not easily deformed when a force is applied, so that the pilling diameter becomes large. Based on the size of the pilling diameter, the pilling resistance was evaluated according to the following four-stage criteria.
A: The pilling diameter is 30 mm or more, and the pilling resistance is quite good.
B: The pilling diameter is 15 mm or more and less than 30 mm, and the pilling resistance is good.
C: A pilling diameter of 10 mm or more and less than 15 mm is slightly poor in pilling resistance.
D: The pilling diameter is less than 10 mm, and the pilling resistance is poor.

As can be seen from the results in Table 1 above, the artificial hair fibers of Examples 1 to 9 were excellent in tactile sensation and good in pilling resistance. Moreover, it was excellent in heat resistance and flame retardancy. On the other hand, Comparative Example 4 containing no brominated epoxy flame retardant was poor in all of flame retardancy, feel and pilling resistance. In addition, Comparative Examples 1 and 2 which contain a brominated epoxy flame retardant but have a (stress at 5% elongation) / (elastic modulus at 1% elongation) of less than 2.0 × 10 ⁻² The nature was bad. Moreover, although the brominated epoxy flame retardant was included, the comparative example 3 whose Young's modulus exceeded 8.0 GPa was bad in touch. In Table 1 above, the pilling diameter of the fiber of Comparative Example 3 is described as “-”. However, since pilling hardly occurs and does not form a ring, the pilling diameter is ∞ (unmeasurable). Means.

  Actually, when the fiber for artificial hair of Example 6 and Comparative Example 1 was made into a fiber bundle, and the fiber bundle was disturbed by wind and the comb was passed 50 times, the state of the hair end of the fiber bundle was confirmed. In Comparative Example 1, the tip of the hair is deformed, the appearance and the touch are remarkably deteriorated, and the combing property is also deteriorated, whereas in Example 6, there is almost no deformation of the tip of the hair and combing is possible without stress. There was almost no deterioration in appearance or touch.

Claims (5)

It is a polyester fiber for artificial hair formed with a polyester resin composition,
The polyester resin composition contains 5 to 40 parts by weight of a brominated epoxy flame retardant with respect to 100 parts by weight of the polyester resin, and the polyester resin is made of a copolymerized polyester mainly composed of polyalkylene terephthalate and polyalkylene terephthalate. One or more selected from the group,
The polyester fiber for artificial hair has a (stress at 5% elongation) / (elastic modulus at 1% elongation) of 2.0 × 10 ⁻² or more and 5.0 × 10 5 as measured in a single fiber tensile test. ^A polyester fiber for artificial hair, characterized in that it is ^-2 or less and Young's modulus is 8.0 GPa or less.   The polyester resin composition further includes 0.1 part by weight of one or more antimony compounds selected from the group consisting of antimony trioxide, antimony tetraoxide, antimony pentoxide, and sodium antimonate with respect to 100 parts by weight of the polyester resin. The polyester fiber for artificial hair according to claim 1, comprising 7 parts by weight or less.   The polyester fiber for artificial hair according to claim 1 or 2, wherein the polyester resin is at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate.   A headdress product comprising the polyester fiber for artificial hair according to any one of claims 1 to 3.   The headdress product according to claim 4, wherein the headdress product is one selected from the group consisting of hair wigs, wigs, weaving, hair extensions, blade hair, hair accessories, and doll hair.