JP5978306B2 - Artificial hair and wig using the same - Google Patents

Description

  The present invention relates to artificial hair made of a polyester monofilament, more specifically, artificial hair made of a polyester monofilament having a core-sheath structure, and a wig using the same.

  Conventionally, human hair has been favorably used as wig hair because it is close to natural hair, particularly natural hair. However, in recent years, human hair is becoming difficult to procure, and artificial hair made of synthetic fibers is used because it takes time to care, the set is easily disturbed when wet, and the hair is easily entangled. It has come to be.

  Examples of the artificial hair material include acrylic (such as modacrylic and vinyl chloride), polyamide (such as nylon 6 and nylon 66), and polyester (such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate) monofilaments.

  Artificial hair made of the above materials has both advantages and disadvantages, but artificial hair made of polyester, especially polyethylene terephthalate resin (PET resin), has high heat resistance and can be easily curled with a curling iron. (Hereinafter referred to as “curling property”) and also has the advantage of maintaining curling even under hot and humid conditions such as bathing and washing hair (hereinafter referred to as “curling property”), and has been widely used in recent years. It has come to be.

  On the other hand, artificial hair made of PET resin is more rigid than human hair, and since the surface is smooth, the gloss is strong and the texture is unnatural. (It is referred to as “shrinkage”), and once it is shrunk, there is a disadvantage that it takes much time to correct it.

  For this reason, as a technique for improving the gloss, various methods have been proposed in which irregularities are formed on the surface of the fiber to remove the gloss. For example, Japanese Patent No. 3074862 discloses a polyester fiber for artificial hair in which polyester fibers containing fine particles such as silica are treated with an alkaline aqueous solution to form irregularities on the surface, and a method for producing the same.

  Artificial hair made of a polybutylene terephthalate resin (PBT resin) has been proposed as a polyester-based artificial hair that is closer to human hair and has improved the drawbacks related to shrinkage. This PBT resin is more flexible than the PET resin, is rich in elastic recovery, has a tactile sensation similar to human hair, and has the advantage that it does not easily cause crimping like the PET resin.

  On the other hand, however, the PBT resin has a disadvantage that the curling property is poor because of its high elastic recovery rate, and the curl setting property is also poor because of its low glass transition point.

  Thus, as a means for improving the disadvantages of the PET resin and the PBT resin, many polymer alloy methods for mixing and spinning the PET resin and the PBT resin have been proposed. For example, Japanese Patent Application Laid-Open No. 2002-161423 discloses artificial hair that is hardly shrunk in texture close to human hair by mixing and spinning 20 to 40% of PBT resin to PET resin.

  However, although artificial hair obtained by spinning PET resin and PBT resin at a certain blend ratio shows intermediate properties between PET resin and PBT resin, curling properties are inferior to human hair and PET resin, and it is curly. Has only half-finished performance such as inferior to human hair and PBT resin.

  Japanese Patent No. 4823237 discloses artificial hair that is made of polytrimethylene terephthalate resin (PTT resin) and has a texture close to that of human hair that does not easily shrink.

  PTT resin is intermediate between PET resin and PBT resin in terms of molecular structure, and is said to be a material that combines the form stability of PET resin and the softness of nylon, and has excellent curling properties and improved shrinkage. It was expected as a material for artificial hair.

  However, according to the study by the inventors of the present application, the PTT resin exhibits properties close to those of the PBT resin, and the curling properties and curl setting properties are not so good.

  As described above, artificial hair made of polyester monofilament (hereinafter referred to as “polyester artificial hair”) having curling properties and curling properties equivalent to human hair and having excellent curling and styling properties is still available. It does not exist at present.

Japanese Patent No. 3074862 JP2002-161423 Japanese Patent No. 4823237

  In order to solve the above-described problems in the prior art, an object of the present invention is to provide artificial hair having curling properties and curling properties equivalent to human hair in a polyester-based artificial hair, and a wig using the same. .

  It is another object of the present invention to provide polyester-based artificial hair that is excellent in curl setting and has styling properties and texture (appearance such as gloss, touch, and texture) close to human hair and a wig using the same.

The present invention for achieving the above object relates to artificial hair composed of a polyester monofilament and a wig using the same.
This artificial hair
Having a core-sheath structure comprising a core part and a sheath part covering the core part;
The core portion is made of polybutylene terephthalate resin or polytrimethylene terephthalate resin,
The sheath is made of a polyester monofilament made of polyethylene terephthalate resin.

  Further, the polyester monofilament preferably has fine irregularities formed on its surface by a weight loss treatment using an alkaline solution, and the weight reduction rate is preferably 30 to 50%.

  Further, the polyester monofilament has a cross-sectional area ratio S1 / S2 that is a ratio of the cross-sectional area S1 of the core part after the weight reduction treatment using the alkaline solution and the cross-sectional area S2 of the sheath part of 10/90 to 40/60. Preferably there is.

  According to the present invention, it is possible to achieve curling properties and curling properties equivalent to human hair that could not be achieved with conventional polyester-based artificial hair. In addition, there is no roughness or luster peculiar to synthetic fibers, and a texture close to human hair such as smooth combing and a smooth touch is obtained. And in the wig using this artificial hair, styling with a hair dryer or curling iron can be done freely as in the case of adjusting own hair. It is superior to human hair.

It is sectional drawing which showed the cross section of the core sheath type | mold polyester monofilament which concerns on one Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing process of the core sheath type | mold polyester monofilament which concerns on this embodiment. It is process drawing which shows the manufacturing process of the artificial hair which concerns on this embodiment. It is the figure (photograph) which observed the surface after the weight reduction process of the core-sheath-type polyester monofilament which concerns on this embodiment with the scanning electron microscope. It is explanatory drawing for demonstrating the texture evaluation as artificial hair.

  Hereinafter, artificial hair and a wig using the same according to an embodiment of the present invention will be described in detail.

[Artificial hair]
First, the artificial hair according to this embodiment will be described.

  The artificial hair has a core-sheath type polyester monofilament comprising two components, a polybutylene terephthalate resin (PBT resin) or a polytrimethylene terephthalate resin (PTT resin) as a core component and a polyethylene terephthalate resin (PET resin) as a sheath component. As shown in FIG. 1, the core-sheath type polyester monofilament F has a core part Fa and a sheath part Fb formed in a substantially concentric circle.

  PET resin has a glass transition point of 70 to 80 ° C., has a relatively high glass transition point, and is more rigid than PBT resin. It has characteristics. On the other hand, PBT resin and PTT resin have characteristics of being flexible and rich in elastic recovery as compared with PET resin. In addition, the glass transition point of PBT resin is 40-50 degreeC, its melting | fusing point is 224-228 degreeC, and the glass transition point of PTT resin is 45-60 degreeC, The melting | fusing point is about 228 degreeC.

  Therefore, the core-sheath type polyester monofilament F using the PET resin as the sheath part Fb and the PBT resin or the PTT resin as the core part Fa exhibits both the characteristics of the PET resin and the characteristics of the PBT resin and the PTT resin. It has high heat resistance, good curling and curling properties, and has the characteristics of being flexible and having excellent elastic recovery. The wig using this has the same curling and curling properties as human hair. Furthermore, a texture close to that of human hair, such as smooth combing and smooth touch, can be obtained. In addition, styling with a hair dryer or curling iron can be freely performed, and further, curling property when wet and styling property with a steam iron are superior to human hair.

  By the way, in order to make use of each characteristic of PET resin, PBT resin, and PTT resin, it is conceivable to use PBT resin or PTT resin as a sheath part and PET resin as a core part. Since the melting point of PTT resin is low, there is a problem that it is not suitable for styling using a heating means such as a curling iron.

  The PBT resin, the PTT resin, and the PET resin are not particularly limited as long as they have fiber-forming properties. 1,4-butanediol, 1,3-propanediol, and ethylene glycol are used as diols, and terephthalic acid is used as a diol. The polyester is preferably a functional carboxylic acid, but may contain a small amount of a copolymer component as long as the original melting point and glass transition point do not change significantly.

  The intrinsic viscosity of the PET resin is preferably 0.5 to 1.4, more preferably 0.6 to 1.0, from the viewpoint of fiber formation. If the intrinsic viscosity is less than 0.5, the mechanical strength of the resulting monofilament is reduced, and if it exceeds 1.4, the melt viscosity becomes higher as the molecular weight increases, so that melt spinning becomes difficult, or Fineness becomes uneven. Moreover, it is preferable that the intrinsic viscosity of PET resin which is a sheath component does not exceed the intrinsic viscosity of PBT resin and PTT resin which are core components. In addition, the intrinsic viscosity said here is the intrinsic viscosity calculated | required from the viscosity measured at 25 degreeC in the orthochlorophenol solution, and is represented by [(eta)].

  The intrinsic viscosity of the PBT resin and the PTT resin is preferably 0.6 to 1.5, and more preferably 0.7 to 1.2, from the viewpoint of fiber formation. When the intrinsic viscosity is less than 0.6, the mechanical strength of the obtained monofilament is reduced, and when it exceeds 1.5, the melt viscosity becomes higher as the molecular weight is increased, so that melt spinning becomes difficult. Or, the fineness becomes non-uniform. Moreover, it is preferable that the intrinsic viscosity of PBT resin and PTT resin which is a core component is 1.0 or more from the surface of roundness and eccentricity.

  The PET resin as the sheath component preferably contains inorganic fine particles as a matting agent. Examples of the inorganic fine particles include silicon oxide (silica), aluminum oxide (alumina), calcium carbonate, calcium phosphate, barium sulfate, talc, and zeolite, but are not limited thereto. Silica is preferably used from the viewpoint of ease of handling and color development.

  As a method for containing the inorganic fine particles, a known method in which a slurry in which the inorganic fine particles are dispersed in ethylene glycol is added to a monomer of terephthalic acid and polycondensed may be used. A method in which a dispersed master batch is prepared, and a certain amount is mixed with a PET resin chip and spun at the time of spinning a monofilament is simple and preferable.

  In addition to the matting agent, the PET resin as a sheath component may contain various color pigments, antibacterial agents, deodorants, antistatic agents, flame retardants and other functional additives. The PBT resin and PTT resin that are core components do not need to contain an additive in particular, but various color pigments may be added to improve the color at the time of color development.

  Next, the manufacturing method of the core-sheath type | mold polyester monofilament of this invention is demonstrated with reference to FIG. As shown in FIG. 2, the spinning machine 1 used for the production of the core-sheath polyester monofilament includes two sets of resin supply tanks 2a, 2b for the core and the sheath, and extruders 3a, 3b with measuring devices. Except that the spinneret is the spinneret 4 for the core-sheath type composite fiber, the configuration is the same as that of a normal monofilament spinning machine, and the spinneret is manufactured through the same process as that for manufacturing a normal monofilament. That is, the monofilament extruded from the core-sheath composite fiber spinneret 4 into the cooling tank 5 is then drawn in the drawing tank 6 and heat-set in the set tank 7. Thereafter, an oil agent is applied and wound around a bobbin by a winder 8.

  Stretching is performed by single-stage stretching or multi-stage stretching, and a hot water tank, a hot air tank, a plate heater, a steam jet, a heating roller, or the like is used alone or in combination.

  The stretching ratio, stretching temperature, heat setting temperature, and heat setting ratio may be appropriately selected as appropriate based on physical properties such as target strength and elongation and shrinkage. The term “shrinkage rate” as used herein refers to the shrinkage rate in boiling water for 30 minutes and dry heat at 130 ° C. for 10 minutes, preferably 5% or less, and more preferably 2% or less. If the shrinkage rate exceeds 5%, the dimensional stability at the time of thermal processing in the manufacturing process of artificial hair is deteriorated, and problems such as shrinkage occur.

  The matting agent to be blended in the sheath component is kneaded into a PET resin as the sheath component in advance to make a compound, or as described above, a masterbatch containing the matting agent is prepared and dried in the previous step of the extruder. You may make it mix | blend by the blend method.

  Next, the manufacturing process of the artificial hair of this invention is demonstrated based on FIG. A predetermined amount of monofilament is scraped from the bobbin around which the monofilament is wound up, and the skein is subjected to a weight-reducing treatment using an alkaline aqueous solution and then neutralized. Subsequently, after performing a dyeing process and a reduction cleaning process, an oil agent or a resin process or the like is applied and dried as necessary. Finally, these are cut into a predetermined length and then combed to obtain artificial hair.

  In the process of manufacturing polyester-based artificial hair, the weight loss treatment process using an alkaline aqueous solution is important for forming fine irregularities on the surface and improving the gloss and texture of the synthetic fibers, such as roughness and shine. It is a process. By performing this weight reduction process, large and small fine irregularities are formed on the surface as shown in FIG. As a method of the weight loss treatment, for example, there is a method of immersing in a sodium hydroxide aqueous solution having a concentration of 5% by weight at a temperature of 98 ° C. and performing a treatment until a predetermined weight loss rate is obtained.

  The weight loss rate is determined in consideration of the amount of matting agent (silica) contained in advance, but is preferably 30 to 50%. If the weight loss rate is less than 30%, a sufficient gloss improvement effect cannot be obtained, and the tactile feel is also rough. On the other hand, when the weight loss rate exceeds 50%, the deterioration progresses and sufficient mechanical strength as artificial hair cannot be maintained.

  Moreover, it is preferable that content of a matting agent is 0.1 to 1.0% of range. When the content is less than 0.1, the matte effect cannot be obtained regardless of the weight loss rate. When the content exceeds 1%, the opacity increases and the tint after dyeing tends to be white. Is seen.

  The artificial hair of the present invention is closer to human hair when the weight loss rate of the weight loss treatment with an alkaline aqueous solution is 40 to 50 and the content of the matting agent (silica) is 0.25 to 0.50%. A tactile sensation and gloss were obtained, and a tactile sensation close to human hair was obtained by setting the thickness after weight reduction treatment to 60 to 70 μm.

  In addition, in order to obtain good heat resistance, curling property, curl setting property, flexibility, and elastic recovery as intended by the present invention, the polyester monofilament has a core after weight reduction treatment using an alkaline solution. It is preferable that the cross-sectional area ratio S1 / S2 which is the ratio of the cross-sectional area S1 and the cross-sectional area S2 of the sheath is 10/90 to 40/60.

[wig]
Next, the wig using the artificial hair manufactured as mentioned above is demonstrated.
This wig is comprised from the wig base and the said artificial hair planted by this wig base.

  The wig base includes, for example, a plain woven fabric made of nylon or polyester filament, or a net base knitted in a net shape, and an artificial skin base made of a sheet-like resin such as polyurethane. As long as it has a function as a base, it is not limited to this.

  Then, the artificial hair produced as described above is planted at an appropriate density on the wig base, and the artificial hair is further cut into an appropriate length to obtain a wig.

  Hereinafter, specific examples of the artificial hair of the present invention and wigs using the same will be described.

  The artificial hair in the examples was evaluated by the following method.

[Physical property test]
The fineness, tensile strength, tensile elongation, and apparent Young's modulus were measured according to the measurement method of JIS L1013, and the 3% elongation elastic modulus was measured according to the measurement method of JIS L1013B.
[Core / sheath cross-sectional area ratio]
The cross section of the artificial hair was observed with a microscope magnified 1000 times, the cross-sectional area S1 of the core and the cross-sectional area S2 of the sheath were measured, and the cross-sectional area ratio S1 / S2 was calculated.
[Hair evaluation]
<Curl setting>
Artificial hair is wrapped around a 2cm diameter aluminum pipe with 5mm diameter holes in several places on the surface, passed through a conveyor oven at 150 ° C for several minutes, and then hung with its own weight to hang the curl. Was evaluated and evaluated in the following four stages by comparison with human hair.
◎ Very good (keep the pipe diameter unchanged)
○ Good (a little stretched)
△ Bad (extends considerably)
× Very bad (extends almost)
<Crimping property>
A stainless steel brush was applied 1000 times to the bundle of artificial hair, and the following four levels were evaluated in comparison with human hair.
◎ Very good (cannot shrink at all)
○ Good (only slightly curved)
△ Bad (Crinkle is C-shaped)
× Very bad (folded in a non-curvature shape)
<Texture>
As shown in FIG. 5, one corresponding monofilament was planted on the wig base 10, the rising state (rise angle) was observed, and evaluated in the following four stages by comparison with human hair.
◎ Very good (almost the same angle as human hair)
○ Good (An angle close to human hair)
△ Bad (An angle that rises more than human hair, or an angle at which she slept)
× Very bad (An extremely raised angle compared to human hair, or a sleeping angle)

  Evaluation of wigs using artificial hair in the examples was performed by the following method.

[Wear wearing test]
Three monitors washed the same wig five times for a total of 15 times, repeated styling using a dryer, curling iron, steamer, etc., and evaluated the following items in the following four stages.
◎ Very good ○ Good △ Bad × Very bad <Glossy naturalness>
It was visually evaluated in comparison with human hair.
<touch>
When touched with a comb or finger, it was evaluated by comparison with human hair in terms of the degree of catch, roughness, smoothness, softness and the like.
<Flying test>
Each time 200 times of combing was performed, the degree of shrinkage was visually evaluated.
<Curl iron>
The degree of curling was evaluated using a curling iron.
<Hairdryer>
Evaluation was made by repeating the process of making a curl with a brush using a hair dryer and then restoring the curl.
<Steamer>
Using a steamer, the hair root was partially raised to increase the volume, or the hair root was partially twisted to evaluate the volume.
<Style maintenance power after washing>
The state of maintenance of the style such as curl after washing was evaluated.
<Ease of style>
The ease of style was comprehensively evaluated.

(Example 1-1 to Example 1-4)
Unit-2 MA-2103 (inherent viscosity 0.68) was used as the PET resin as the sheath component. Further, 5 parts by weight of a master batch containing 5% silica manufactured by Tosoh Silica Co., Ltd. as a matting agent was added to 95 parts by weight of PET resin. As the core component, NOVADURAN 5010L (inherent viscosity 1.0) (PBT resin) manufactured by Mitsubishi Engineering Plastics Co., Ltd. was used. The sheath router has an extruder temperature of 285 ° C. and the core has an extruder temperature of 270 ° C., and the PET resin and the PBT resin are melted. 1) 10/90 (Example 1-2), 20/80 (Example 1-3), 30/70 (Example 1-4) Spinning from a spinneret for mold composite fibers into a cooling tank, and then stretching 4 times in hot water at 90 ° C, heat setting in a hot air tank at 200 ° C, and then applying an oil agent A core-sheath polyester monofilament having a fineness of 89 dtex was obtained by winding it around a bobbin.

  Next, a predetermined amount of the filament was taken and immersed in an aqueous sodium hydroxide solution having a concentration of 50 g / L and a temperature of 98 ° C., and a weight reduction treatment was performed so that the weight loss rate was 45%.

  And as mentioned above, after performing the dyeing | staining process and a reduction | restoration washing process, it was made to dry, after providing the oil agent. Finally, these were cut into predetermined lengths and then combed to obtain black artificial hair with a fineness of 49 dtex.

(Example 1-5 to Example 1-8)
As the core component, the core was processed in the same manner as in Example 1-1 to Example 1-4 except that PTT resin crystallized product (inherent viscosity 1.0) (PTT resin) manufactured by Asahi Kasei Chemicals Co., Ltd. was used. Example 1-5 in which the sheath weight ratio was 5/95, Example 1-6 in which the weight ratio was 10/90, Example 1-7 in which the weight ratio was 20/80, Example 1-8 with 30/70 was obtained. And about each of these Examples 1-5 to Example 1-8, the same weight reduction process, dyeing process, reduction cleaning process, oil agent application, drying, cutting, and combing process were performed.

(Comparative Example 4)
Human hair was prepared for comparison.

  The physical property values, core / sheath cross-sectional area ratio, curl setting property, crimp property and texture of the obtained artificial hairs of Example 1-1 to Example 1-8 were evaluated in comparison with human hair. The results are shown in Tables 1 and 2.

  As can be seen from Tables 1 and 2, in Example 1-2, Example 1-3, Example 1-6 and Example 1-7, curl setting, crimping and texture are all human hair. It was equivalent to (Comparative Example 4 in Table 4), showed very good results, and was of satisfactory quality. On the other hand, Example 1-1 and Example 1-5 had curl setting properties equivalent to human hair, but their curling property and texture were slightly inferior to those of human hair, and Examples 1-4 and In Example 1-8, the crimpability was equivalent to that of human hair, but the curl setting and texture were slightly inferior to those of human hair. From this, in order to obtain curl setting properties, crimpability and texture equivalent to human hair, the core / sheath cross-sectional area ratio (S1 / S2) is preferably 10/90 to 40/60, and this ratio is When the ratio is less than 10/90, the shrinkage and the texture are inferior to those of human hair. When this ratio exceeds 40/60, the curl setting and the texture are compared with human hair. It turns out that it becomes inferior.

(Example 2-1 and Example 2-2)
Implementation that is black artificial hair with a fineness of 67 dtex, with each treatment applied in accordance with Example 1-2 and Example 1-6, except that the weight loss treatment using an alkaline aqueous solution is 25%. Example 2-1 and Example 2-2 were obtained.

  The physical properties, core / sheath area ratio, curling property, and curling property of the obtained artificial hair were evaluated. The results are shown in Table 3.

  As can be seen from Table 3, the artificial hairs of Example 2-1 and Example 2-2 had curl setting properties equivalent to those of human hair, but were slightly inferior in curling property.

(Comparative Examples 1 to 3)
Comparative Example 1 compares PET resin (MA-2103 (Intrinsic viscosity 0.68) manufactured by Unitika Co., Ltd.) and Comparative Example 2 compares PBT resin (Novaduran 5008 (Intrinsic viscosity 0.85) manufactured by Mitsubishi Engineering Plastics). Example 3 uses PTT resin (manufactured by Asahi Kasei Chemicals Co., Ltd. (intrinsic viscosity 0.86)) independently, using a normal round hole cap having 60 holes, and spinning from this spinneret into a cooling tank, Subsequently, the film was stretched 4 times in hot water at 90 ° C., and then heat-set in a hot air bath at 200 ° C. After that, an oil agent was applied and wound on a bobbin to obtain a 89 dtex monofilament.

  Next, a predetermined amount of the above monofilament was taken and immersed in an aqueous sodium hydroxide solution having a concentration of 50 g / L and a temperature of 98 ° C., and in Comparative Example 1, the weight loss rate was 45%. In Example 3, the weight loss treatment was performed so that the weight loss rate was 25%, and then the dyeing treatment and the reduction cleaning treatment were performed, and the oil agent was applied and dried. Finally, these were cut to a predetermined length and then combed to obtain black artificial hair. The fineness of the artificial hair was 49 dtex in Comparative Example 1 and 66 dtex in Comparative Examples 2 and 3. The reason why the weight loss rate was changed between Comparative Example 1, Comparative Example 2 and Comparative Example 3 is that PBT resin and PTT resin are superior in chemical resistance compared to PET resin, and thus have strong resistance to alkaline aqueous solution. In order to achieve the same weight loss rate as that of the PET resin, it took about 3 times longer and it was not practical, so the weight loss rate was set low.

  The obtained artificial hair was evaluated for physical properties, curling properties, curling properties and texture in comparison with human hair. The results are shown in Table 4.

  As can be seen from Table 4, the curling property of Comparative Example 1 was equivalent to that of human hair, but the curling property and texture were very poor compared to human hair. In Comparative Example 2, the curling property was similar to that of human hair, but the curl setting property was very poor and the texture was slightly inferior to that of human hair. Comparative Example 3 showed substantially the same propensity as Comparative Example 2, although the curl setting was slightly improved compared to Comparative Example 2.

  From this, when the glass transition point is high, the curl setting property is high but the shrinkage property is low, and when the glass transition point is low, the curling property is high but the curl setting property tends to be low. I understand.

(Comparative Example 5-1 to Comparative Example 5-3)
80/20 (Comparative Example 5-1), 70/30 (PET resin (manufactured by Unitika Ltd. (intrinsic viscosity 0.68)) and PBT resin (manufactured by Mitsubishi Engineering Plastics Co., Ltd. (intrinsic viscosity 0.80)). Comparative Example 5-2), 60/40 (Comparative Example 5-3) so as to be a blend chip using a twin-screw kneading extruder, each treatment was performed according to Comparative Examples 1-3, 89 dtex black monofilament was obtained.

  Next, with respect to the monofilament, an alkaline aqueous solution was used so that the weight loss rate was 35% in Comparative Example 5-1, and the weight loss rate was 30% in Comparative Examples 5-2 and 5-3. Each treatment was carried out in accordance with Comparative Examples 1 to 3 except that the weight loss treatment was performed to obtain black artificial hair. The fineness of the artificial hair was 58 dtex in Comparative Example 5-1, and 62 dtex in Comparative Example 5-2 and Comparative Example 5-3.

  The obtained artificial hair was evaluated for physical properties, curl setting, curling and texture in comparison with human hair. The results are shown in Table 5.

  As can be seen from Table 5, in each of Comparative Examples 5-1 to 5-3, the curl setting property, the crimping property, and the texture were inferior to human hair.

  Furthermore, from the results of Example 1-1 to Example 1-4 and the results of Comparative Examples 5-1 to 5-3, a core-sheath structure having a PBT resin as a core and a PET resin as a sheath is used. As a result, it can be seen that superior properties are exhibited compared to simply mixing the PBT resin and the PET resin.

  The PET resin and the PBT resin can be mixed by a so-called dry blend method in which the respective chips are mixed before the extruder of the monofilament spinning machine. However, the PET resin and the PBT resin are sufficiently uniformly mixed. Otherwise, defects such as shrinkage occur in the artificial hair dyeing process. Therefore, the mixing of the PET resin and the PBT resin was performed in advance with an extruder.

  Moreover, although the mixed monofilament of PET resin and PBT resin is not as much as the monofilament of PBT resin or PTT resin alone, compared with the monofilament of PET resin alone, the resistance to alkaline aqueous solution is strong, so the weight loss rate is the same as that of PET resin alone. Smaller than the case. Furthermore, there is a drawback that the PET resin / PBT resin mixing ratio of the artificial hair before and after the weight loss treatment varies due to the difference in resistance of the PET resin and the PBT resin to the alkaline aqueous solution.

(Example 3-1 to Example 3-6 and Comparative Example 6 to Comparative Example 8)
Example 1-2, Example 1-3, Example 2-1, Example 1-6, Example 1-7, Example 2-2, Synthetic hair of Comparative Example 1 and Comparative Example 2, and Comparative Example 4 human hairs were respectively implanted in the wig base to obtain the wigs of Example 3-1 to Example 3-6 and Comparative Example 6 to Comparative Example 8. As the wig base, a nylon monofilament knitted in a net shape was used.

  Eight items were evaluated: the natural luster of the obtained wig, touch, shrinkage, curling iron, dryer, steamer, style retention after washing, and ease of style. The results are shown in Tables 6 and 7.

  As can be seen from Tables 6 and 7, the wigs of Example 3-1, Example 3-2, Example 3-4 and Example 3-5 showed very good results for all the evaluation items. In particular, with regard to the steamer, the style maintenance power after washing and the ease of style, the results exceeded those of human hair. Although the wigs of Example 3-3 and Example 3-6 were slightly inferior to human hair in terms of natural luster, touch and shrinkage, they were steamers, style retention power and style after washing. About ease of care, the result which exceeds human hair was shown. Further, the wig of Comparative Example 6 is extremely inferior in curling property compared to human hair, and the wig of Comparative Example 7 is slightly inferior in natural gloss to human hair. Was extremely inferior compared to human hair.

DESCRIPTION OF SYMBOLS 1 Core-sheath type polyester monofilament spinning machine 2a Resin supply tank for core part 2b Resin supply tank for sheath part 3a Extruder with measuring device for core part 3b Extruder with measuring device for sheath part 4 Spinneret for core-sheath type composite fiber 5 Cooling tank 6 Stretching tank 7 Set tank 8 Winder F Core-sheath polyester monofilament Fa Core part Fb Sheath part

Claims (5)

Having a core-sheath structure comprising a core part and a sheath part covering the core part;
The core portion is made of polybutylene terephthalate resin or polytrimethylene terephthalate resin,
Artificial hair characterized in that the sheath is composed of a polyester monofilament made of polyethylene terephthalate resin.   The artificial hair according to claim 1, wherein the polyester monofilament has fine irregularities formed on a surface thereof by a weight reduction treatment using an alkaline solution.   The artificial hair according to claim 2, wherein a weight reduction rate by the weight loss treatment is 30 to 50%.   The polyester monofilament is characterized in that a cross-sectional area ratio S1 / S2, which is a ratio of a cross-sectional area S1 of the core portion after the weight reduction treatment and a cross-sectional area S2 of the sheath portion, is 10/90 to 40/60. The artificial hair according to claim 2 or 3. A wig composed of a wig base and artificial hair implanted in the wig base,
The said artificial hair is the artificial hair in any one of Claims 1 thru | or 4, The wig characterized by the above-mentioned.