TWI432150B - Artificial hair fiber and method of producing the same - Google Patents

Description

Artificial hair fiber and method of producing the same

The present invention relates to a fiber for artificial hair for wig hair, hair extension hair or substitute hair, and a method for producing the same, and more particularly to a fiber for artificial hair having a glossiness and a sensation of natural hair, and an improved fiber material property And a method of manufacturing the same, and a wig for using the fiber for artificial hair.

Although wigs have been made using natural hair for a long time, many synthetic fibers which are processed into artificial hair have been used due to limitations in the supply of natural hair materials. As the raw material of the artificial hair fiber, a polymer such as acrylonitrile, vinyl chloride, polyester or polyamine is known. The artificial hair fiber formed of acrylonitrile or vinyl chloride is difficult to maintain after being styled by heat treatment because of poor heat resistance, and is, for example, exposed to warm water or blown with a hair dryer. The weakness of the shaped curl shape that will collapse. The fiber for artificial hair formed of polyester has good strength and heat resistance, but the moisture absorption is much lower than that of natural hair, and the bending rigidity value is too high, so that, for example, in a high humidity environment, natural hair is revealed. Different touch, appearance, physical characteristics. Therefore, when the artificial hair fiber formed of the polyester is used for a wig, it exhibits a significant unnatural feeling with respect to human hair.

Here, the bending rigidity value is related to the hand touch feeling such as the fiber touch or the texture, and the physical property value quantified by the Kawabata measurement method is widely recognized in the fiber textile industry (Non-Patent Document 1). This bending stiffness value is defined by the reciprocal of the change in the bending rate of the hair as a function of the moment when a specific amount of bending moment is applied to the artificial hair. In general, the greater the bending rigidity value of the artificial hair, the more difficult it is to bend, and the less the deflection, that is, the artificial hair that is hard and hard to bend. Conversely, the smaller the bending rigidity value, the easier it is to bend and the soft artificial hair. A device for measuring the bending rigidity value from one fiber or hair has been developed (for example, KATO TECH Co., Ltd., KES-SH single hair bending tester).

Polyamide has an amide group in a constituent molecule and has a chemical structure similar to that of natural hair, and thus is considered to be more suitable as a raw material for fibers for artificial hair than other polymers. Artificial hair fibers made from polyamine can exert higher moisture absorption than artificial hair fibers formed from other polymers. The reason why artificial hair of polyamine is considered to be suitable is that it is close to the soft hand touch feeling of natural hair due to high moisture absorption, and similar to the characteristic change of natural hair when wet, and strength, stretch, and the like. Excellent physical properties and durability.

However, the fiber for artificial hair formed of polyamine is inferior to the fiber for artificial hair formed of polyester in terms of curl setting property and curl retention property. In addition, although it has physical properties similar to natural hair, it is still very different from natural hair in terms of luster and glamour, which is a problem.

Natural hair has complex optical properties (such as the unique glamour of black hair) due to its characteristic structure, and optical properties close to natural hair cannot be obtained only by polymerizing the polymer. In particular, when fiberizing is carried out by a known melt spinning method, the surface of the fiber tends to be smooth regardless of the type of the polymer, and has a specular gloss due to the surface state of the fiber. Therefore, various techniques for suppressing or reducing specular gloss to adjust gloss have been proposed in the past.

In the method of suppressing the gloss of the surface of the fiber, for example, a method of mixing an organic material such as a polymer composed of a material different from the main component of the fiber (Patent Document 1), and a composition containing inorganic fine particles and/or organic fine particles are mixed. In the method of polymer (Patent Document 2), a method in which the surface of the fiber is etched and etched by a mineral acid, and then extended (patent document 3), after the polyester polymer containing inorganic fine particles is melt-mixed and fiberized, a base is used. A method of etching an aqueous solution (Patent Document 4), a method of covering a surface of a fiber with a low refractive polymer (Patent Document 5), and spraying abrasive particles of a polishing material onto a surface of a fiber from a nozzle to grind the surface of the fiber to make the surface A blasting method (Patent Document 6) and a method of gradually cooling the spherulie on the surface of the fiber to form a concavo-convex shape on the surface of the fiber immediately after melt-spinning (Patent Document 7).

In addition, it is known that when two or more kinds of resins are mixed and melt-spun, a relatively small amount of resin components (hereinafter referred to as "particles") will protrude from the surface of the spun fiber, instead of a relatively high-resin resin (hereinafter referred to as "Matrix"), which protrudes from the surface of the spinning fiber.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-3089

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2007-332507

[Patent Document 3] Japanese Patent Publication No. 43-22349

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2007-303014

[Patent Document 5] Japanese Patent Laid-Open No. 48-13695

[Patent Document 6] Japanese Patent Laid-Open Publication No. 2003-23918

[Patent Document 7] Japanese Patent Publication No. 3-10726

[Non-patent literature]

[Non-Patent Document 1] Kawabata Yoshio, Fiber Machinery Society (Fiber Engineering), 26, 10, pp. 721-728, 1973

Any of the above methods exerts a certain degree of effect in suppressing or reducing the excessive specular gloss emitted from the surface of the fiber. However, it is difficult to have the complex optical characteristics of natural hair and to make the appearance more similar.

For example, in the method of adjusting the specular gloss by mixing fine particles of an inorganic material or an organic material as described in Patent Documents 1 and 2, when the fiber obtained by the melt spinning is extended, the inorganic material or the fine particles of the organic material are mixed. It is distributed in the vicinity of the surface of the fiber to form fine protrusions on the surface of the fiber, so that it is easy to cause breakage at the time of manufacture. Moreover, it is necessary to add a large amount of fine particles of an inorganic material or an organic material, and it is necessary to make the particle size of the fine particles of the inorganic material or the organic material to a desired size. Therefore, in the vicinity of the surface of the fiber, the ratio of the material different from the polymer belonging to the main material of the fiber becomes large, which detracts from the surface characteristics of the polymer or the feel of the hand. Furthermore, the artificial hair produced by such methods may have a situation in which the strength is lowered or the color is adversely affected.

In the method of etching described in Patent Documents 3 and 4, the etching of the specular gloss is performed by forming an etching hole on the surface of the fiber. Therefore, it has optical characteristics different from those formed by the cuticle of natural hair, and its appearance is also different, and even adversely affects the physical property value such as fiber strength.

In the artificial hair obtained by the method of Patent Document 5 in which the surface of the fiber is covered with a low refractive polymer from an optical point of view, since the angle of the reflected light of only the light irradiated to the surface of the fiber is changed, the adjustment of the gloss is insufficient, and Covering the low refractive polymer, the hand touch of the fiber will also change.

In the blasting method described in Patent Document 6, since a large amount of abrasive grains are sprayed on the surface of the fiber, the fiber is easily damaged, and the physical properties such as tensile strength are remarkably lowered. Moreover, the touch is also hardened, which is detrimental to the hand touch of the polymer.

The method for growing spherulites on the surface of the fibers described in Patent Document 7 is such that the surface of the fibers is close to the uneven state of the surface of the natural hair on which the waxy film is laminated, and a good appearance and touch can be obtained as compared with the other methods described above. sense. However, since the difference in subtle manufacturing conditions greatly affects the generation of spherulites, it is necessary to stably control appropriate manufacturing conditions, which is time-consuming and labor-intensive with the control. In particular, when the pigment and/or the fuel are kneaded in a polymer for coloring when the fiber is produced, the type and amount of the pigment and/or the dye may greatly affect the generation of the spherulites. Therefore, in order to obtain the rich color number and fine color tone required for artificial hair, it is required to control the melting temperature and the spinning discharge pressure depending on the type or lot of the polymer and pigment and/or dye used. The conditions such as the extension temperature and the stretching ratio become the predetermined strength and the wire diameter. Therefore, the manufacturing conditions become complicated. In addition, in order to promote the growth of the spherulites, since the operation of gradually cooling in warm water immediately after the melt spinning is performed, the wire breakage is liable to cause breakage, which is disadvantageous in terms of productivity.

In the case of artificial hair, regardless of any of the above-described gloss adjustment methods, the gloss is suppressed and the glare is lost, so that it has optical characteristics different from those of natural hair. Natural hair, in appearance, has a special optical property that can maintain a moderately radiant sensation and suppress gloss, so that artificial hair can be approximated to natural hair, and an effective means of maintaining a moderately radiant and adjustable gloss can be achieved. Still in development.

Further, in the artificial hair formed of polyamine, the specific technique for improving the curl setting property and the curl retaining property (hereinafter also referred to as the crimping property) which are evaluation characteristics of artificial hair has not been completed.

An object of the present invention is to provide a fiber for artificial hair which can maintain a moderately glamorous feeling and suppress gloss, and which is intended to improve material properties. Another object of the present invention is to provide a method for producing an artificial hair fiber having such excellent characteristics. Another object of the present invention is to provide a wig which is produced using the above-mentioned artificial hair fiber.

The fiber for artificial hair of the present invention is characterized by a first thermoplastic polymer as a matrix (hereinafter also referred to as a matrix) and a second thermoplastic which is incompatible with the first thermoplastic polymer and has a different melting point. The polymer (hereinafter also referred to as a microparticle for short) is formed of a fiber having an uneven shape on the surface, and the convex portion of the fiber is formed of the first thermoplastic polymer.

Further, the wig of the present invention is characterized in that the first thermoplastic polymer as a matrix and the second thermoplastic polymer which is incompatible with the first thermoplastic polymer and have different melting points are melt-spun. The surface has a concavo-convex shape, and the convex portion is a fiber formed of the first thermoplastic polymer as an artificial hair, and a plurality of artificial hairs are provided.

The method for producing an artificial hair fiber according to the present invention is a method of producing a fiber for artificial hair having a concave-convex shape on a surface, and is made of a first thermoplastic polymer as a matrix and incompatible with a first thermoplastic polymer and melted. a mixed polymer composed of a second thermoplastic polymer having different points, melt-mixed at a melting temperature equal to or higher than a melting point of the second thermoplastic polymer, and a temperature at which the melt-mixed polymer is below the melting temperature It is extruded under the shape of a fiber.

The fiber for artificial hair of the present invention can suppress the gloss while maintaining the radiance of natural hair, and maintain and further enhance the physical properties of the first thermoplastic polymer as a matrix.

That is, the fiber for artificial hair of the present invention can withstand the physical properties such as the strength of the substrate, and can maintain the natural feeling of the hair while suppressing the gloss, so that it can be touched or enriched with the natural hand required by the wig. The hair color corresponds, and the performance of the expandable wig changes. Furthermore, the curling properties of the substrate can also be improved. Thereby, the processing can be simplified, the time for setting the curl can be shortened, and the shape collapse is less, and the number of times of the curl setting is reduced again, which contributes to the improvement of the durability of the artificial hair.

Hereinafter, the present invention will be described in detail based on a number of embodiments.

(First Embodiment of the Invention: Method for Producing Fiber for Artificial Hair of the Present Invention)

The artificial hair fiber of the present invention can be composed of a first thermoplastic polymer which is a matrix and a second thermoplastic polymer which is incompatible with the first thermoplastic polymer and has a melting point different from that of the second thermoplastic polymer. The mixed polymer is melt-mixed at a melting temperature above the melting point of the first thermoplastic polymer and the second thermoplastic polymer, and the melt-mixed polymer is extruded at a discharge temperature below the melting temperature. It is formed into a fiber shape.

Fig. 1 shows a general spinning apparatus using a uniaxial feed screw extruder for producing the fibers for artificial hair of the present invention. The apparatus is a hopper that feeds a polymer, a cylinder that heats the polymer to be charged, a feed screw that melts and kneads the polymer and sends it to the discharge section, and is melted. The mixed resin is supplied to a gear pump 4 of the spinneret head 5. The melt-mixed resin is spun from the spinneret head 5 into a filament shape for spinning. Further, although the number of feed screws may be uniaxial or multiaxial, it may be appropriately selected depending on the characteristics of the polymer or the thickness of the fiber to be formed.

The spinning device for producing the fiber for artificial hair of the present invention generally adopts a uniaxial or biaxial feed screw extruder shown in Fig. 1 or Fig. 2 to send the melt mixed resin to the spinneret head. The composition. The gear pump 4 used in the single-shaft feed screw extruder shown in Fig. 1 is not used in the twin-screw extruder of Fig. 2. However, the configuration in which the gear pump is removed as shown in Fig. 2 does not affect the formation of the artificial hair surface convex body of the resin as the matrix. In the second diagram, the system which does not include the boosting function can be suitably used because the resin which is melt-mixed can shorten the residence time of the resin in the spinning device and reduce the thermal deterioration of the resin.

The second thermoplastic polymer needs to use a thermoplastic polymer which is incompatible with the first thermoplastic polymer and has a melting point different from that of the first thermoplastic polymer. Further, it is preferable that the second thermoplastic polymer has a melting point higher than that of the first thermoplastic polymer in forming the uneven shape on the surface of the artificial hair fiber. In order to design such a combination, the first thermoplastic polymer and the second thermoplastic polymer may be suitably selected from the group consisting of polystyrene, polyphenylene ether, polyolefin, and polychlorinated. A resin of a polyvinyl chloride type, a polyamidamide type, a polyester type, a polyphenylensulfide type, or a polymethacrylate type. Here, the term "non-combination" means that the two types of polymers do not contain a polymer which is melted to be uniform.

Specifically, a combination of a polyamide resin such as nylon 6 as a first thermoplastic polymer and a polyester resin such as a PET resin as a second thermoplastic polymer is preferred. .

Further, since the first thermoplastic polymer is used as the matrix, the blending ratio of the second thermoplastic polymer as the fine particles is required to be one-half or less of the total weight. That is, no more than the mixing ratio of the first thermoplastic polymer. Preferably, the weight ratio of the first thermoplastic polymer to the second thermoplastic polymer is in the range of 95/5 to 70/30.

The resin mixed at a predetermined weight ratio within the above range is set to a predetermined temperature higher than the higher temperature of the melting point of the first thermoplastic polymer or the second thermoplastic polymer (this temperature is referred to as melting) The temperature T1 is set to melt. Pigments and/or dyes may also be added for coloring when these materials are mixed. Furthermore, stabilizers and antioxidants and/or UV absorbers may be added, and these additives may be directly supplied to the spinning device, or may be put into the polycondensation by pre-mixed masterbatch. Amine resin or polyester resin. Further, a pigment and/or a dye may be added during the melting to color the mixture. Further, a stabilizer and an antioxidant and/or an ultraviolet absorber may be added to the mixture. The pigment, the dye, the stabilizer or the ultraviolet absorber may be directly supplied to the spinning device, or the pre-kneaded color concentrate may be put into the polyamide resin or the polyester resin.

The first thermoplastic polymer and the second thermoplastic polymer supplied from the hopper 1 are melted, and then sent out from the cylinder 2 to the spinneret head 5 by the uniaxial or biaxial feed screw 3. The temperature of the melt-mixed resin is preferably a temperature higher than the melting set temperature T1 or higher than the melting set temperature T1, but may be a range in which the molten resin does not solidify, or may be lower than the melt set temperature T1. temperature.

Fig. 3 is a schematic view showing the spinneret head 5. In the figure, reference numeral 25 denotes a resin discharge hole, reference numeral 26 denotes a resin which is ejected from the ejection hole 25, and reference numeral 27 denotes a temperature sensor which is inserted into the discharge port of the spinneret head 5 and which is disposed at a position near the discharge port, T2. The temperature of the resin R in the molten state before the discharge was measured by the temperature sensor. Further, the temperature of the resin which has been melted before the discharge is set to T2, and the resin discharge temperature of the spinneret head 5, that is, the spinneret set temperature is set to T3.

When the mixed resin is kneaded by the feed screw in the spinning device, the molten resin temperature T2 is generally higher than the melt set temperature T1, but when the molten resin temperature T2 before the discharge is too high than the melt set temperature T1. In the surface of the resin ejected from the spinneret head 5, the formation of the convex portion of the first thermoplastic polymer is small, or the formation of the convex portion of the first thermoplastic polymer does not occur, which is not preferable. On the other hand, when the temperature T2 of the molten resin before the discharge is too low than the melting set temperature T1, since the viscosity of the mixed resin becomes high and does not flow any more, it is not preferable because it cannot be ejected.

The spinneret set temperature T3 is preferably set to a temperature lower than the molten resin temperature T2 at a position near the discharge port, and is preferably set to be about 20 to 30 ° C lower than the melt set temperature T1. When the temperature is higher than the above range, it is difficult to form irregularities on the surface of the discharged resin. On the other hand, when the temperature is lower than the range, the resin is easily solidified, which is not preferable.

More preferably, the spinneret set temperature T3 is set to be equal to or less than the melting point of the second thermoplastic polymer. The spinneret set temperature T3 is preferably in the range of 5 ° C or more and 30 ° C or less lower than the melting point of the second thermoplastic polymer. More preferably, the spinneret set temperature T3 is set to be lower than the melting point of the second thermoplastic polymer by 10 ° C or more and 30 ° C or less. When the temperature is higher than the range, the unevenness of the surface of the discharged resin is difficult to form. On the other hand, when the temperature is lower than the range, the resin is easily solidified, which is not preferable.

Further, the spinneret used does not require a special structure, and the fiber for artificial hair of the present invention can be sufficiently obtained by a spinneret having a known structure.

Fig. 4 is a view showing the outline of the steps from the spinning to the fiber according to the present invention.

The fibrous discharge resin 6 discharged from the spinneret head 5 through the gear pump 4 of the spinning device under the above temperature conditions is air-cooled (the range of A, B, and C in the drawing) and is cooled by water cooling in the cooling water tank 7. It is taken up by the coiler 19. Although the step of performing water cooling is shown in Fig. 4, the discharge resin 6 may be cooled and re-wound only by air cooling. In addition, the spinning device can also be designed as shown in Fig. 2 without using a gear pump.

The molten resin discharged from the discharge holes 25 of the spinning device has fluidity and can be stretched and stretched. However, the resin to be ejected is solidified by cooling to cure the resin, and when the fluidity of the resin is lowered, it is no longer heated, and it is impossible to stretch. The state in which the resin ejected from the ejection hole 25 can be stretched by the set winding speed is defined as the extended flow range. The elongation flow range is not fixed, but varies depending on the resin to be used, the set temperature of the spinneret, the installation site temperature of the spinning device, and the take-up speed.

Conventionally, when the resin is melt-spun, in order to prevent clogging of the resin at the spinneret head of the resin, the spinneret set temperature T3 is not made lower than the molten resin temperature T2 before the discharge. Therefore, the spinneret set temperature T3 is set to a temperature which is the same as or slightly higher than the melt set temperature T1. When the spinneret set temperature T3 is a temperature equal to or higher than the molten resin temperature T2 or the melt set temperature T1 before the discharge, the resin component belonging to the fine particles is precipitated depending on the resin to be used, and the uneven structure is formed on the surface of the fiber. It is known that the formation of the uneven structure of the resin component belonging to the matrix is not known.

However, when the spinneret set temperature T3 is set to be lower than the melt set temperature T1, the fine particles are not deposited on the surface of the fiber, but are covered by the resin component of the matrix, or a small protrusion formed by the matrix component is formed on the surface of the fiber. . In particular, when the spinneret set temperature T3 is lower than the melting point of the second thermoplastic polymer, a large number of small protrusions covered by the matrix are remarkably formed.

Fig. 5A to Fig. 5D show the surface state after the spinning of the artificial hair sampled at points A to D of Fig. 4.

Fig. 5A is a point A in Fig. 4, a picture in Fig. 5B is a point B in Fig. 4, a picture in Fig. 5C is a point C in Fig. 4, and a picture in Fig. 5 is a picture D in Fig. 4. A magnified image of the surface state of the artificial hair fiber sampled at each point (1000 times magnification).

Although the convex portion of the matrix resin is hardly formed on the fiber surface at the point A immediately after the ejection, the convex portion is formed before the spun fiber is wound around the bobbin (see FIGS. 5B and 5C). ), and at the time of winding (refer to Figure 5D), the size of the convex portion is maximized. That is, the formation of the convex portion of the substrate ends at the stage before the winding, and is not related thereto in the subsequent process, and a convex portion is formed on the surface of the fiber.

The fiber for artificial hair taken up is passed through a stretching roller and a dry heat tank of the stretching device, and the wire diameter is extended to 80 μm or the like to a predetermined wire diameter. Alternatively, the spinning device and the stretching device may be connected in series to continuously perform the spinning step and the stretching step. In the production method of the present invention, since the addition of the inorganic fine particles or the alkali treatment is not performed, irregularities are formed on the surface of the fiber, so that no special treatment step is required.

(Second embodiment: fiber for artificial hair)

The artificial hair fiber of the second embodiment contains a main component (that is, a first thermoplastic polymer as a matrix) and a smaller amount than the first thermoplastic polymer, and is non-phase with the first thermoplastic polymer. A fiber obtained by fusing a mixed resin of a second thermoplastic polymer having different melting points and having a different melting point and having a concavo-convex shape on the surface, and the convex portion of the fiber is formed of a first thermoplastic polymer.

The fiber structure for artificial hair of the second embodiment is formed by dispersing the second thermoplastic polymer (fine particles) in the sea-island structure of the first thermoplastic polymer (matrix) in addition to the convex portion of the fiber. The ratio of the first thermoplastic polymer belonging to the main component of the artificial hair fiber is larger than that of the second thermoplastic polymer, and the ratio of the first thermoplastic polymer to the second thermoplastic polymer is 95% by weight. /5 to 70/30 range.

In the present embodiment, the convex portion appearing on the surface of the fiber is formed of the first thermoplastic polymer (matrix). That is, the fiber surface is formed into a concavo-convex shape by a polymer having the same composition as the matrix. By this concave-convex shape, the specular gloss caused by the surface state of the fiber can be suppressed or reduced. In the present invention, it is not necessary to use inorganic particles as in the prior art, and the surface of the fiber is not damaged as in the alkali treatment or the sand blasting treatment, so that the fiber strength is not lowered. Further, since the fiber surface convex portion is formed of the same first thermoplastic polymer as the matrix, the hand touch feeling of the substrate is not impaired and can be maintained. If the uneven shape of the surface of the fiber is formed of a different thermoplastic polymer, since the thermoplastic polymer has different touch feelings, a hard state or a rough feeling is generated, and the touch characteristic peculiar to the substrate cannot be maintained.

The artificial hair fiber of the second embodiment can be produced by the production method described in the first embodiment.

(Third embodiment: fiber for artificial hair)

The artificial hair fiber of the third embodiment is composed of a mixed resin containing polyamine as the first thermoplastic polymer (matrix) and polyester as the second thermoplastic polymer (fine particles). The fiber surface is the same as that of the second embodiment, and has a concavo-convex shape, and the convex portion of the fiber is formed of polyamine. The blending ratio of the polyamide constituting the fiber for artificial hair is more than that of the polyester, and the ratio of the polyamide/polyester is in the range of 95/5 to 70/30 by weight.

The structure of the artificial hair fiber of the third embodiment is the same as that of the second embodiment, and is a sea-island structure in which polyester is dispersed in polyamine in addition to the convex portion of the fiber. On the other hand, the convex portion of the fiber is formed of polyamine. By this concave-convex shape, it is suppressed or lightened because of the specular gloss characteristic of the polyester fiber. Further, since the convex portion of the fiber surface is formed of polyamine, it can be maintained without impairing the mildness peculiar to polyamine. When the convex portion of the fiber surface is formed of polyester, a hard state or a rough feeling is generated, and the softness cannot be maintained.

The polyamine compound may, for example, be a linear saturated aliphatic polyamine such as nylon 6, nylon 66 or nylon 610, or an alternating copolymer of hexamethylenediamine and terephthalic acid, for example, nylon 6T, adipic acid. A semi-aromatic polyamine which is a polymer such as nylon MXD6 which is bonded to m-xylylenediamine.

The microparticles may be polymers which are incompatible with polyamines depending on the characteristics desired for artificial hair. Preferably, a polyester resin having a crimp property superior to that of polyamine is used, for example, a polyester resin such as polyethylene terephthalate or polybutylene dicarboxylate.

Polyamide has strong alkali resistance but weak acid resistance and dissolves in acid. On the other hand, polyester has strong acid resistance, but is weak in alkali resistance and dissolves in alkali.

Therefore, even if the artificial hair fiber of the third embodiment is subjected to alkali treatment, the convex portion of the fiber does not dissolve or a large opening is formed on the surface. On the other hand, if it is treated with an acid, the convex portion is dissolved.

The artificial hair fiber of the third embodiment may be produced by the production method described in the first embodiment.

As described in the first embodiment, the convex portion of the polyamide is hardly formed on the surface of the fiber immediately after being ejected from the spinneret head, but a convex portion is formed before the bobbin is wound, and at the time of winding, The size of the protrusions is maximized. That is, the formation of the convex portion of the polyamide is completed at the stage before the winding, and thus the convex portion is formed on the surface of the fiber regardless of the subsequent process.

The blending ratio of polyamine to polyester is in the range of from 95/5 to 70/30 by weight.

In the artificial hair fiber of the third embodiment, the convex portion on the surface of the hair is formed only of a polyamide resin belonging to the main component (matrix). Therefore, unlike the roughening of the surface by the heterogeneous material mixing method or the sand blasting method which is a method for forming the convex portion of the prior art, the soft touch characteristic of the polyamidamine is not impaired, and is similar to the natural hair. Brilliant or lustrous for a more natural look and feel. In other words, it is possible to improve the curling property while maintaining the physical properties such as the strength of the conventional polyamine-based artificial hair and the feeling of softness or elasticity. In the fiber for artificial hair according to the third embodiment, the appearance (optical property) is approximated to the appearance of natural hair due to the unevenness of the amorphous protrusion formed by the polyamide resin protruding on the surface of the fiber.

Further, by blending a polyester having a heat setting property which is one of the crimping characteristics as fine particles, the properties of the curling property are improved. The amount of curl required for artificial hair can be imparted at a low temperature, and the retention is also improved. Further, since the curl can be imparted at a low temperature, thermal deterioration is alleviated and durability is improved.

Furthermore, the present inventors produced artificial hair for wigs by kneading a pigment raw material by melt-spinning the fiber raw material as the matrix and the fine particles, and the artificial hair was planted mostly in wigs. Base to make a wig. With respect to the artificial hair manufactured in this manner, as a result of investigations such as optical characteristics such as glare or gloss, or curling properties, it is possible to obtain a characteristic having a characteristic similar to natural hair, and a more natural appearance and touch. In other words, it is known that the physical properties such as the strength of the polyamine-based artificial hair of the prior art, the tactile sensation such as softness or elasticity, and the curling property are improved.

According to the present invention, since the heat setting property is improved, the desired curl size can be formed with good precision, and thus the range of the shape which can be expressed when used in a wig can be expanded. Further, since the retention of the curl is improved, the shape is less likely to collapse, the time for setting is shortened, and the number of times of curling is reduced, and the durability of the wig is improved.

[Examples] (Experimental Example 1)

A polyamidamide resin (hereinafter referred to as PA) using NOVAMID1020 (saturated aliphatic polyamine, nylon 6 (nylon registered trademark), melting point of 225 ° C) manufactured by Mitsubishi Engineering Plastics Co., Ltd., and manufactured by Toyobo Co., Ltd. RE530A (melting point: 255 ° C) was used as a fine particle polyester resin (hereinafter referred to as PET), and artificial hair was produced by the spinning device shown in Fig. 4 and the stretching device shown in Fig. 6. Further, T1 is the melting set temperature, T2 is the molten resin temperature in the vicinity of the spinneret, and T3 is the spinneret set temperature T3.

Manufacturing conditions are as follows:

PA/PET mixing ratio (weight ratio) 80/20

Pigment blending ratio (% by weight of input resin) Black 0.15% yellow 0.30% red 0.04%

T1/T2/T3(°C) 260/260/235

Spinning discharge amount 1.0kg/h

Cooling water temperature 20 ° C

Spinning speed 270m/min

Experimental site room temperature 22 ° C

Extension ratio 3 times

Extension temperature (air) 150 ° C

Fig. 8A, Fig. 8B and Fig. 9 show the state of the obtained fiber surface for artificial hair. Figure 8A is a magnified image of the surface after spinning of the artificial hair of the present invention. Figure 8B shows a magnified image of the surface after stretching (1000 times). Fig. 9 is a cross-sectional enlarged image (1000 times) showing the extension of the artificial hair of the present invention.

As can be seen from Fig. 9, the surface morphology of the artificial hair of the present invention is that the two thermoplastic polymers exhibit an island structure, and the island portion is in an almost uniformly dispersed state, and the convex body is indefinitely protruded from the surface. And the bumps are formed. Further, although the cross-sectional shape of the artificial hair in Fig. 9 is circular, it may be an irregular shape other than an ellipse or a 茧-shaped circle.

Fig. 10 is a view showing the alkali treatment of the obtained artificial hair fiber (injecting an artificial hair fiber bundle into an aqueous solution in which 500 g of a caustic soda is dissolved in a ratio of 150 g, heated, and placed in a boiling state; Minutes), the surface magnified image (1000 times) after the polyester resin in the mixed polymer of the polyamide resin and the polyester resin was dissolved. In the convex portion, no opening formed by dissolution of the polyester was observed. Thus, it can be understood that the surface of the artificial hair fiber obtained is a matrix of a polyamide resin.

Figure 11 is a view showing the surface after the acid treatment of the fibers for artificial hair (immersion of formic acid at normal temperature for 1 to 3 seconds) to dissolve the polyamide resin in the mixed polymer of the polyamide resin and the polyester resin. Zoom in on the image (1000 times). The convex portion is partially dissolved and the unevenness disappears, and the granular resin is dispersed. As can be seen from Fig. 10 and Fig. 11, the convex portion of the surface of the artificial hair fiber is formed of a polyamide resin. The exposed granular resin is a polyester resin as fine particles.

(Experimental Example 2)

The same procedure as in Experimental Example 1 was carried out except that the spinneret set temperature T3 was 245 °C. Figure 13 shows the surface image (1000 times) of the artificial hair that was spun and wound. It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 3)

The same procedure as in Experimental Example 1 was carried out except that the molten resin temperature T2 was 270 ° C and the spinneret set temperature T3 was 250 ° C. Figure 14 shows the surface image (1000 times) after the spinning step and before the winding.

(Experimental Example 4)

The same procedure as in Experimental Example 1 was carried out except that the molten resin temperature T2 was 275 ° C and the spinneret set temperature T3 was 255 ° C. Figure 15 shows a surface image (1000 times) of artificial hair taken by spinning. Although the surface of the fiber was formed with a convex body, the height of the convex body was lower than those of Experimental Examples 1 and 2.

(Experimental Example 5)

In the spinning apparatus shown in Fig. 12, in addition to the configuration in which the gear pump 4 is incorporated and the molten resin temperature T2 is 252 ° C, the spinneret set temperature T3 is 225 ° C, and the spinning discharge amount is set to 0.35 kg. /h, the spinning spinning speed was set to 1000 m/min, and the winding was performed only by air cooling, and the same as Experimental Example 1.

Figure 16 shows the surface image of the artificial hair (1000 times) after the spinning. It can be seen that a convex body is formed on the surface of the fiber.

(Example 6)

In the spinning apparatus shown in Fig. 12, in addition to the configuration in which the gear pump 4 is incorporated, and the molten resin temperature T2 is 252 ° C, the spinneret set temperature T3 is 225 ° C, and the spinning discharge amount is set to 0.35 kg. /h, the spinning spinning speed was set to 2000 m/min, and the winding was performed only by air cooling, and the same as Experimental Example 1. Figure 17A shows a surface image (1000 times) of artificial hair after being taken up by spinning. It can be seen that a convex body is formed on the surface of the fiber.

Fig. 17B is a diagram showing the alkali treatment (the artificial hair fiber bundle is put into an aqueous solution in which 500 g of water is dissolved in a caustic soda at a ratio of 150 g, heated, and left in a boiling state for 20 minutes) to obtain a polyamide resin and a polyester resin. The surface magnified image (1000 times) of the mixed polymer after the dissolution of the polyester resin. No openings were formed on the surface where the polyester resin was dissolved.

(Experimental Example 7)

In the spinning apparatus shown in Fig. 12, in addition to the configuration of the gear pump 4 and the molten resin temperature T2 of 252 ° C, the spinneret set temperature T3 is set to 252 ° C / 225 ° C, and the spinning discharge amount is set. The same procedure as in Experimental Example 1 was carried out except that the spinning spinning speed was 0.35 kg/min, and the winding speed was only taken by air cooling. Figure 18 shows the surface image (1000 times) of the artificial hair after the spinning. It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 8)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 99/1, the molten resin temperature T2 was 255 °C, and the spinneret set temperature T3 was 225 °C. Fig. 19A shows the surface image (1000 times) of the artificial hair after the spinning is taken up, and the 19B image shows the surface image (1000 times) after the stretching.

(Experimental Example 9)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 95/5, the molten resin temperature T2 was 255 °C, and the spinneret set temperature T3 was 225 °C. Fig. 20A shows a surface image (1000 times) of artificial hair after being wound by spinning, and Fig. 20B shows a surface image (1000 times) after stretching. It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 10)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 90/10, and the molten resin temperature T2/the spinneret set temperature T3 was 255 °C/225 °C. Fig. 21A shows the surface image (1000 times) of the artificial hair after the spinning is taken up, and Fig. 21B shows the surface image after stretching (1000 times). It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 11)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 80/20, the molten resin temperature T2 was 255 ° C, and the spinneret set temperature T3 was 225 °C. Fig. 22A shows the surface image (1000 times) of the artificial hair after the spinning is taken up, and Fig. 22B shows the surface image after stretching (1000 times). It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 12)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 70/30, the molten resin temperature T2 was 258 ° C, and the spinneret set temperature T3 was 230 °C. Fig. 23A shows the surface state of the artificial hair after the spinning is taken up, and Fig. 23B shows the surface state after the stretching. It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 13)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 60/40, the molten resin temperature T2 was 263 ° C, and the spinneret set temperature T3 was 235 °C. Fig. 24A shows a surface image (1000 times) of the artificial hair after the spinning is taken up, and Fig. 24B shows a surface image (1000 times) after the extension. It can be seen that a convex body is formed on the surface of the fiber. It can be known that when the proportion of PET is more than that of PA, it is difficult to form a convex body on the surface of the artificial hair.

(Experimental Example 14)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 10/90, the molten resin temperature T2 was 269 ° C, and the spinneret set temperature T3 was 245 °C. Fig. 25A shows a surface image (1000 times) of artificial hair after being wound by spinning, and Fig. 25B shows a surface image (1000 times) after stretching. It can be known that when the proportion of PET is more than that of PA, the surface of the artificial hair is not formed with a convex body.

(Experimental Example 15)

The same procedure as in Experimental Example 1 was carried out except that the PA/PET mixing ratio (weight ratio) was 20/80, the molten resin temperature T2 was 267 ° C, and the spinneret set temperature T3 was 245 °C. Fig. 26A shows the surface image (1000 times) of the artificial hair after the spinning is taken up, and Fig. 26B shows the surface image after stretching (1000 times). It can be known that when the proportion of PET is more than that of PA, the surface of the artificial hair is not formed with a convex body.

(Experimental Example 16)

A polyamide resin made of MX nylon (semi-aromatic polyamide, melting point of 243 ° C) manufactured by Mitsubishi Gas Chemical Co., Ltd. was used, and the melting set temperature T1 was set to 280 ° C, and the molten resin temperature T2 was set to 258 ° C. The spinneret set temperature T3 was set to 230 ° C, and was the same as in Experimental Example 1. Figure 27 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 17)

The polyamide resin using MX nylon (semi-aromatic polyamide, melting point of 243 ° C) manufactured by Mitsubishi Gas Chemical Co., Ltd., and the spinneret set temperature T3 were set to 230 ° C, and Experimental Example 1 was used. the same. Fig. 28A shows a surface image (1000 times) of artificial hair after being taken up by spinning. In addition, Figure 28B shows the extended surface image (1000 times).

(Experimental Example 18)

A polyamide resin made of MX nylon (semi-aromatic polyamide, melting point of 243 ° C) manufactured by Mitsubishi Gas Chemical Co., Ltd., and a molten resin temperature T2 of 268 ° C and a spinneret set temperature T3 were set. The same as Experimental Example 1 except for 245 °C. Figure 29 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 19)

Using the NOVAMIDX21-F07 (semi-aromatic polyamide, no specific melting point) manufactured by Mitsubishi Engineering Plastics Co., Ltd. as the base polyamide, and setting the molten resin temperature T2 to 255 ° C, the spinneret set temperature T3 is set to The same as Experimental Example 1 except for 225 °C. Figure 30 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 20)

Using the NOVAMIDX21-F07 (semi-aromatic polyamide, no specific melting point) manufactured by Mitsubishi Engineering Plastics Co., Ltd. as the matrix polyamide, and setting the molten resin temperature T2 to 258 ° C, the spinneret set temperature T3 is set to The same as Experimental Example 1 except for 230 °C. Figure 31A shows the surface image (1000 times) of the artificial hair after the spinning. In addition, Fig. 31B shows an extended surface image (1000 times).

(Experimental Example 21)

Using the NOVAMIDX21-F07 (semi-aromatic polyamide, no specific melting point) manufactured by Mitsubishi Engineering Plastics Co., Ltd. as the matrix polyamide, and setting the molten resin temperature T2 to 262 ° C, the spinneret set temperature T3 is set to The procedure was the same as in Experimental Example 1 except for 235 °C. Figure 32 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 22)

A polyamide resin using Zytel 158 (saturated aliphatic polyamine, nylon 6.12, melting point 218 ° C) manufactured by DuPont as a substrate, and a molten resin temperature T2 of 246 ° C and a spinneret set temperature T3 were set. The same as Experimental Example 1 except for 225 °C. It can be seen that a convex body is formed on the surface of the fiber. Figure 33 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 23)

The polyimide resin of Zytel 158 (saturated aliphatic polyamine, nylon 6.12, melting point 218 ° C) manufactured by DuPont Co., Ltd., and the molten resin temperature T2 were set to 254 ° C, and were the same as in Experimental Example 1. Figure 34A shows a surface image (1000 times) of artificial hair after passing through cooling water in the spinning step. In addition, Figure 34B shows the extended surface image (1000 times).

(Experimental Example 24)

A polyamide resin using Zytel 158 (saturated aliphatic polyamine, nylon 6.12, melting point 218 ° C) manufactured by DuPont as a substrate, and a molten resin temperature T2 of 262 ° C and a spinneret set temperature T3 were set. The same as Experimental Example 1 except for 245 °C. Fig. 35 is a view showing the surface image (1000 times) of the artificial hair which was taken up after passing through the cooling water in the spinning step. It can be seen that a convex body is formed on the surface of the fiber.

(Experimental Example 25)

Using UBESTA Polyamide 3014U8 (saturated aliphatic polyamine, nylon 12, melting point 176 ° C) manufactured by Ube Industries Co., Ltd. as a matrix of polyamide resin, and setting the molten resin temperature T2 to 245 ° C, the spinneret The setting temperature T3 was set to 225 ° C, and was the same as in Experimental Example 1. Figure 36 shows the surface image (1000 times) of the artificial hair after the spinning.

(Experimental Example 26)

Ubene polycarbamide 3014U8 (saturated aliphatic polyamine, nylon 12, melting point 176 ° C) manufactured by Ube Industries Co., Ltd. was used as the matrix polyamide resin, and the molten resin temperature T2 was set to 245 ° C, Experimental Example 1 was the same. Figure 37A shows the surface image (1000 times) of the artificial hair after the spinning. In addition, Figure 37B shows the extended surface image (1000 times).

(Experimental Example 27)

Ubene polycarbamide 3014U8 (saturated aliphatic polyamine, nylon 12, melting point 176 ° C) manufactured by Ube Industries Co., Ltd. was used as the base polyamine resin, and the molten resin temperature T2 was set to 260 ° C, and the spinneret was used. The setting temperature T3 was set to 245 ° C, and was the same as in Experimental Example 1. Figure 38 shows a surface image (1000 times) of artificial hair after being taken up by spinning.

(Comparative Example 1)

The resin used was only NOVAMID1020 (saturated aliphatic polyamine, nylon 6, melting point 225 ° C) manufactured by Mitsubishi Engineering Plastics Co., Ltd., except that the molten resin temperature T2 was set to 255 ° C, and the spinneret set temperature T3 was set to The procedure was carried out in the same manner as in Experimental Example 1 except at 225 °C. Fig. 39A shows the surface image (1000 times) of the artificial hair after the spinning is taken up, and Fig. 39B shows the surface image (1000 times) after the stretching step.

(Comparative Example 2)

The resin used was only RE530A manufactured by Toyobo Co., Ltd. as a polyester resin, and the same procedure as in Experimental Example 1 was carried out except that the molten resin temperature T2 was 269 ° C and the spinneret set temperature T3 was 245 ° C. Figure 40 shows the surface image (1000 times) of the artificial hair after the spinning is taken up.

(Comparative Example 3)

The polyamine-based artificial hair of the prior art is spun using the spinning device shown in Fig. 12. The spinning conditions are as follows.

Resin: NOVAMID1020 manufactured by Mitsubishi Engineering Plastics Co., Ltd. (saturated aliphatic polyamine, nylon 6, melting point 225 ° C)

Pigment blending ratio (% by weight of input resin): black 0.15% yellow 0.30% red 0.04%

Melting point and spinneret head temperature: 260 ° C

Cooling water temperature: 30 ° C

Spraying resin spinning speed: 60m/min

Further, the yarn obtained by the spinning under the above conditions was stretched and sandblasted by the stretching device shown in Fig. 7. The extension and sandblasting conditions are as follows.

Dry heat bath temperature: 180 ° C

Extension ratio: 4.5 times

Sandblasting conditions a) Sand blasting machine form: suction-type air-accelerated sand blasting

b) Type of sandblasting material: artificial emery abrasive material

c) Sandblasting material particle size: #600

d) Spray nozzle diameter: 7mm

e) Number of spray nozzles: 3

f) Jet air pressure: 3kg/cm ²

g) Distance between spray nozzle and fiber material: 10cm

h) Fiber material feed speed: 270m/min

Fig. 41A shows a surface image (800 times) of the artificial hair after being taken up by spinning, and Fig. 41B shows a surface image (800 times) after the stretching step.

(Experimental Example 28)

Nylon 6: PEN (Polyethylene naphthalate, polyethylene naphthalate) = 80:20 (weight ratio) was spun under the following conditions.

Spraying amount: 1.0kg/h, spinneret hole diameter: 0.7mm, spinneret hole number: 3, spinning speed: 270m/min, cooling water temperature: 20°C, melting temperature T1: 280°C, spinneret setting Temperature T3: 260 ° C

Figure 48 is a magnified image (500 times) showing the surface of the fiber.

Figure 49A shows the alkali treatment (heating of the artificial hair fiber bundle in an aqueous solution in which 500 g of water is dissolved in a caustic soda at a ratio of 150 g, and left in a boiling state for 20 minutes) to make the polyamide resin and the polyester resin A magnified image of the surface after the dissolution of the polyester resin in the mixed polymer (1200 times). No opening formed by alkali treatment was observed, and it was found that the convex surface was a polyamide resin (nylon 6). Figure 49B is an enlarged image (500 times) showing the profile after alkali treatment. It can be seen that the polyester portion in the fiber core is melted to form an opening.

(Comparative Example 4)

The yarn was spun under the same conditions as Experimental Example 28 except that the spinneret temperature T3 of Experimental Example 28 was set to 270 °C.

Figure 50 is a magnified image (500 times) showing the surface of the fiber obtained.

Fig. 51A is a surface enlarged image (1200 times) obtained after alkali treatment under the same conditions as Experimental Example 28. On the surface, an opening formed by alkali treatment was observed, and it was found that the protrusion on the surface was a polyester resin. Figure 51B is an enlarged image (500 times) showing the profile after alkali treatment. It can be seen that the polyester portion inside the fiber core is melted to form an opening.

(Comparative Example 5)

The yarn was spun under the same conditions as Experimental Example 28 except that the spinneret temperature T3 of Experimental Example 28 was set to 275 °C.

Figure 52 is a magnified image (500 times) showing the surface of the fiber obtained.

Fig. 53A is a magnified image (1200 magnifications) obtained by subjecting the alkali treatment to the same conditions as in Experimental Example 28. On the surface, an opening formed by alkali treatment was observed, and it was found that the protrusion on the surface was a polyester resin. Figure 53B is an enlarged image (500 times) showing the profile after alkali treatment. It can be seen that the polyester portion inside the fiber core is melted to form an opening.

(Comparative Example 6)

The yarn was spun under the same conditions as Experimental Example 28 except that the spinneret temperature T3 of Experimental Example 28 was set to 285 °C.

Figure 54 is a magnified image (500 times) showing the surface of the fiber obtained.

Fig. 55A is a surface enlarged image (1200 times) obtained by subjecting the alkali treatment to the same conditions as in Experimental Example 28. On the surface, an opening formed by alkali treatment was observed, and it was found that the protrusion on the surface was a polyester resin. Figure 55B is a magnified image (500 times) showing the profile after alkali treatment. It can be seen that the polyester portion inside the fiber core is melted to form an opening.

In addition, Fig. 42 shows a list of manufacturing conditions of the above experimental examples and comparative examples.

With respect to the above experimental examples and comparative examples, the strength characteristics, the tactile sensation, and the curling characteristics of the artificial hair fibers were examined by the methods described below.

[evaluation method] (strength characteristics)

The tensile strength was measured under the following conditions.

Model: EZ Test, Shimadzu Small Formal Testing Machine

Measurement conditions: distance between punctuation points of 50 mm, tensile speed of 100 mm/min

(optical properties)

The angle of reflected light and its intensity when light was irradiated to the hair at a specific incident angle were measured under the following conditions.

Model: Murakami Color Technology Institute Automatic Angle Photometer GP-200

Measurement conditions: As shown in Fig. 43, when the light axis 22 is orthogonal to the surface of the hair and the light is tilted by 30 degrees to the hair (incident angle of 30 degrees), the reflected light is measured. The virtual axis 22 described above is an intensity at which 0 degrees spreads in the range of 0 to 90 degrees.

From the above-mentioned measured data, when the horizontal axis is the reflected light scattering angle and the vertical axis is the intensity of the respective scattering angles to make a distribution curve, the waveform has a narrower waveform width and the higher is judged to be glossy and gorgeous. Both are strong. On the contrary, if the waveform width is wider and lower, it is judged to be dull and not gorgeous.

In comparison, natural hair I was used as 20-year-old male hair, natural hair II was used as 30-year-old male hair, and natural hair III was used as 40-year-old male hair. In the manufacturing method of Comparative Example 3, in sandblasting conditions, comparison was made. Example 3A is a fiber which measures the degree of surface roughening by reducing the jet air pressure to 2 kg/cm ² (Fig. 44, magnification: 800 times), and in the manufacturing method of Comparative Example 3, within the blasting conditions, Comparative Example The 3B system measures fibers in which the number of spray nozzles is increased to 6 holes to enhance the surface roughening degree (Fig. 45, magnification: 800 times).

(touch)

The average friction coefficient and the average friction coefficient variation value were measured under the following conditions.

Model: KATO TECH friction tester KES-SE

Measurement conditions: A friction member (sensor) of 25 g load was applied to a sample in which 10 hairs were arranged at intervals of 1 mm along the longitudinal direction of the slide glass and fixed at both ends, at a speed of 10 mm/sec. Go back and forth on the sample.

The average coefficient of friction (hereinafter referred to as MIU) is related to the smoothness of the surface of the measurement sample. The larger the value, the more difficult it is to slide, and the feeling of touch is stiff. The change in the average friction coefficient (hereinafter referred to as MMD) indicates the degree of change in the MIU. The larger the value, the more rough, uneven, and dry, and the smaller the oil, the more sexy and sticky. Further, in comparison, the measurement of the natural hair II used in the above optical property comparison was also performed at the same time.

(curl property)

A 10 cm long hair piece was prepared by placing a sewing machine with 20 to 25 hairs at a pitch, attached to an aluminum tube and heat-treated to impart curl to measure the curl size and the shampoo. Curl retention.

Curl-providing conditions: The above-mentioned hair piece was attached to an aluminum tube having a diameter of 20, 30, and 40 mm, and a non-woven fabric was wound on the hair piece, and heat treatment was performed at 160 ° C for 60 minutes.

The heat setting property and retention property of the curled shape after the curling are expressed by the value of the tube diameter for imparting the curl divided by the hair curling diameter, and are compared. That is, the lower the value, the better the heat setting and retention.

(Results and observations)

Regarding the polyamine resin belonging to the matrix, it can be known from the experimental examples that any of the polyamines is formed by the formation of irregularities in the case where the saturated aliphatic polyamine and the semi-aromatic polyamine have a polyamide resin protruding on the surface. Resins are suitable.

Further, it was also found that the mixing ratio of the polyamide resin to the polyester resin was such that the polyamine resin/polyester resin was in the range of 95/5, and irregularities were formed on the surface. Further, from the results of Experimental Examples 14 and 15 and Comparative Examples 1 and 2, it is understood that when the mixing ratio of the polyester resin is set to be larger than that of the polyamide resin or when the polyamide resin or the polyester resin is used alone. , no irregularities were formed on the surface of the fiber.

However, as is understood from Comparative Example 6, when the spinneret set temperature T3 is higher than the melt set temperature T1, no convex portion is formed on the fiber surface. Therefore, it has been found that in order to form the convex portion on the surface of the fiber, it is necessary to set the spinneret set temperature T3 to a temperature lower than the melt set temperature T1.

With regard to the formation of the convex portion on the surface of the fiber after spinning, it is understood that as the temperature of the spinneret set temperature T3 becomes higher and the temperature difference from the melting set temperature T1 becomes smaller, the number of convex portions formed becomes smaller. On the other hand, in the spinneret set temperature T3 of Experimental Example 4, almost no unevenness was observed, and it was found that the spinneret set temperature T3 was preferably about 20 to 30 ° C lower than the melt set temperature T1.

In particular, it can be known that when the spinneret set temperature T3 is lower than the melting point of the second thermoplastic polymer, the convex portion of the fiber surface is not even melted by the alkali, and the convex portion is covered by the polyamine, or Formed by polyamine. The temperature difference between the spinneret set temperature T3 and the melting point of the second thermoplastic polymer is in the range of 5 ° C or more and 30 ° C or less, and more preferably in the range of 10 ° C or more and 30 ° C or less.

The artificial hair fiber of the present invention is melt-spun by mixing a matrix resin and a resin which is incompatible with the matrix resin and having a different melting point under specific conditions to form a fiber surface. The structure of the convex portion formed of the matrix resin. By mixing the incompatible resin, it is inferred that (1) the resin formed by the stretching after the formation of the fiber is peeled off from each other, and (2) the vicinity of the boundary between the fiber surface and the convex portion, that is, the root of the convex portion is liable to cause a turtle. The strength caused by cracking is reduced. However, as shown in the first table, it was found that the strength required for hair for wig or hair extension was obtained regardless of any of the experimental examples. Further, when the wig base or the hair extension member is implanted, the strength determination criterion for cutting the hair material due to shampooing or combing after the wig base or the hair extension member is set is 1.2 CN/dtex.

Compared with Comparative Example 3, although the strengths of Experimental Examples 14 and 15 were high, and the strengths and elongations of Experimental Examples 20 and 23 were low, this was caused by the properties of the resin used as the matrix, as described above. There is no problem with the intensity itself.

The elastic modulus in the first table is a numerical value indicating the degree of fiber tension or elasticity, and is a criterion for judging the feeling of touch and the appearance. Therefore, it is found that the experimental examples other than the experimental examples 14 and 15 are not greatly different from the comparative examples. Thus, the construction of the present invention also maintains the same feel and appearance as the polyurethane resin monomer fibers.

Figure 46 shows the results of reflected light scattering. The waveforms of the experimental examples 12 and 13 were gentle, and the state in which the gloss and the glare were disappeared. Further, in Experimental Example 8 and Comparative Example 1, the waveform peak value was an acute angle, and the gloss did not disappear (see Fig. 46). From this, it is understood that the first thermoplastic polymer/second thermoplastic polymer is preferably in a weight ratio of from 95/5 to 70/30.

Figure 47 shows the results of the tactile sensation. In Experimental Examples 12 and 28, the variation coefficient (MMD) of the average friction coefficient was high, and the smoothness and dryness were larger than those of natural hair, and it was difficult to slide and feel stiff compared to natural hair. In Experimental Example 8, although the MMD value was the same as that of the natural hair, the average friction coefficient (MIU) was high and it was difficult to slide, and the touch was hard (see Fig. 47). From this, it is understood that the first thermoplastic polymer/second thermoplastic polymer is preferably in the range of from 95/5 to 70/30 by weight.

The second watch shows the results of the curl setting and retention of the crimp characteristics. Further, the comparison object in the table was a fiber manufacturer using only nylon 6 under the same conditions as in Experimental Example 1.

As shown in the second table, the diameter of any tube of 20 to 40 mm is smaller than that of the conventional polyamine-based artificial hair, and it is known that the curling property is greatly improved.

It can be judged from the above evaluation results that the mixing ratio of the polyamide resin/polyester resin is preferably 95/5 to 70/30 by weight, and the setting temperature T3 of the spinneret is 10 ° C or more and 30 ° C or less. Artificial hair which is set to be lower than the melting set temperature T1 as a manufacturing condition is preferable.

1. . . Feed hopper

2. . . Cylinder

3. . . Feed screw

4. . . Gear pump

5. . . Spinning head

6. . . Spray resin

7. . . Cooling sink

8. . . Guide rollers

9. . . Coiler

10. . . First extension roller

11. . . 2nd extension roller

12. . . Third extension roller

13. . . 4th extension roller

14. . . First dry heat sink

15. . . 2nd dry heat sink

16. . . Third dry heat sink

17. . . Lubricating device

18. . . Sand blasting device

19. . . Coiler

20. . . Near the squirt

twenty one. . . Hair

twenty two. . . Virtual axis

23A. . . Incident light

23B. . . reflected light

twenty four. . . Reflected light scattering angle

25. . . Resin ejection hole

26. . . Post-spray resin

27. . . Temperature sensor

T1. . . Melting set temperature

T2. . . Molten resin temperature

T3. . . Spinner setting temperature

Fig. 1 is a schematic view of a spinning apparatus using a general single-shaft feed screw extruder for producing fibers for artificial hair of the present invention.

Fig. 2 is a schematic view of a spinning apparatus using a general twin-screw screw extruder for producing the fibers for artificial hair of the present invention.

Fig. 3 is a schematic view of the spinneret heads of Figs. 1 and 2;

Fig. 4 is a schematic view showing a winding step from spinning to fiber in the first embodiment of the present invention.

Fig. 5A is a magnified image of the surface (1000 times) after the spinning of the artificial hair showing the point A of Fig. 4.

Fig. 5B is a magnified image of the surface (1000 times) after spinning of the artificial hair showing the point B of Fig. 4.

Fig. 5C is a magnified image of the surface (1000 times) after spinning of the artificial hair showing the point C of Fig. 4.

The 5D figure is a surface enlarged image (1000 times) after the spinning of the artificial hair showing the point D in FIG.

Fig. 6 is a schematic view showing the step of extending the fiber after the winding of the present invention.

Fig. 7 is a schematic view showing an extending step after the fiber is taken up in the comparative example.

Fig. 8A is a magnified image (1000 magnifications) of the artificial hair after the spinning of Experimental Example 1.

Fig. 8B is an enlarged image (1000 magnifications) showing the extended surface of the artificial hair of Experimental Example 1.

Fig. 9 is a cross-sectional enlarged image (1000 magnifications) showing the extension of the artificial hair of Experimental Example 1.

Fig. 10 is a surface enlarged image (1000 magnifications) showing the alkali-treated fibers of the artificial hair obtained in Experimental Example 1.

Fig. 11 is a surface enlarged image (1000 magnifications) showing the acid treatment of the artificial hair fiber obtained in Experimental Example 1.

Fig. 12 is a view showing a spinning method of an experimental example and a comparative example.

Fig. 13 is a magnified image (1000 magnifications) showing the surface of the fiber obtained in Experimental Example 2.

Fig. 14 is a magnified image (1000 magnifications) showing the surface of the fiber obtained in Experimental Example 3.

Fig. 15 is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 4.

Fig. 16 is a magnified image (1000 magnifications) showing the surface of the fiber obtained in Experimental Example 5.

Fig. 17A is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 6.

Fig. 17B is a surface enlarged image (1000 magnifications) showing the artificial hair fiber obtained in Experimental Example 6 after alkali treatment.

Fig. 18 is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 7.

Fig. 19A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 8.

Fig. 19B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 8.

Fig. 20A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 9.

Fig. 20B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 9.

Fig. 21A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 10.

Fig. 21B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 10.

Fig. 22A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 11.

Fig. 22B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 11.

Fig. 23A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 12.

Fig. 23B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 12.

Fig. 24A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 13.

Fig. 24B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 13.

Fig. 25A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 14.

Fig. 25B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 14.

Fig. 26A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 15.

Fig. 26B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 15.

Fig. 27 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 16.

Fig. 28A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 17.

Fig. 28B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 17.

Fig. 29 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 18.

Fig. 30 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 19.

Fig. 31A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 20.

Fig. 31B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 20.

Fig. 32 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 21.

Fig. 33 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 22.

Fig. 34A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 23.

Fig. 34B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 23.

Fig. 35 is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 24.

Fig. 36 is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 25.

Fig. 37A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Experimental Example 26.

Fig. 37B is a magnified image (1000 magnifications) of the fiber surface obtained after the extension obtained in Experimental Example 26.

Fig. 38 is a magnified image (1000 magnifications) of the fiber surface obtained in Experimental Example 27.

Fig. 39A is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Comparative Example 1.

Fig. 39B is a magnified image (1000 magnifications) of the fiber surface after extension shown in Comparative Example 1.

Fig. 40 is a magnified image (1000 magnifications) of the fiber surface after spinning obtained in Comparative Example 2.

Fig. 41A is a magnified image (800 times) of the fiber surface after spinning obtained in Comparative Example 3.

Fig. 41B is a magnified image (800 times) of the fiber surface after extension shown in Comparative Example 3.

Fig. 42 is a list of manufacturing conditions of experimental examples and comparative examples.

Figure 43 is a schematic diagram of a method of measuring reflected light.

Fig. 44 is a magnified image (800 times) showing the surface of the artificial hair (Comparative Example 3A) which was slightly sandblasted to the surface of the fiber.

Fig. 45 is a surface enlarged image (800 times) of the artificial hair (Comparative Example 3B) after the blasting degree of Comparative Example 3A was enhanced.

Figure 46 is a graph showing the measurement results of optical characteristics.

Figure 47 is a graph showing the measurement results of the tactile characteristics.

Figure 48 is a magnified image (500 times) of the fiber surface obtained in Experimental Example 28.

Fig. 49A is a surface enlarged image (1200 times) of the artificial hair fiber obtained in Experimental Example 28 after alkali treatment.

Fig. 49B is a cross-sectional enlarged image (500 times) of the artificial hair fiber obtained in Experimental Example 28 after alkali treatment.

Fig. 50 is a magnified image (500 times) of the fiber surface obtained in Comparative Example 4.

Fig. 51A is a surface enlarged image (1200 times) showing the artificial hair fiber obtained in Comparative Example 4 after alkali treatment.

Fig. 51B is a cross-sectional enlarged image (500 magnifications) showing the artificial hair fiber obtained in Comparative Example 4 after alkali treatment.

Fig. 52 is a magnified image (500 magnifications) showing the surface of the fiber obtained in Comparative Example 5.

Fig. 53A is a surface enlarged image (1200 times) showing the artificial hair fiber obtained in Comparative Example 5 after alkali treatment.

Fig. 53B is a cross-sectional enlarged image (500 magnifications) showing the artificial hair fiber obtained in Comparative Example 5 after alkali treatment.

Fig. 54 is a magnified image (500 magnifications) showing the surface of the fiber obtained in Comparative Example 6.

Fig. 55A is a magnified image (1200 times) of the surface of the artificial hair fiber obtained in Comparative Example 6 after alkali treatment.

Fig. 55B is a cross-sectional enlarged image (500 magnifications) showing the artificial hair fiber obtained in Comparative Example 6 after alkali treatment.

The representative figure has no component symbols and the meanings it represents.

Claims (14)

A fiber for artificial hair, which is formed of a first thermoplastic polymer as a matrix and a second thermoplastic polymer which is incompatible with the first thermoplastic polymer and has a different melting point, and has a concave-convex shape on the surface a fiber, wherein the convex portion of the fiber is formed of the first thermoplastic polymer, wherein the structure other than the convex portion has a sea portion formed of the first thermoplastic polymer, and 2 The island portion formed by the thermoplastic polymer. The fiber for artificial hair according to claim 1, wherein the first thermoplastic polymer is a polyamide resin, and the second thermoplastic polymer is a polyester resin. The artificial hair fiber according to claim 1, wherein the first thermoplastic polymer is selected from the group consisting of linear saturated aliphatic polyamines, hexamethylene diamines and terephthalic acid. An alternating copolymer, and at least one thermoplastic polymer of the group consisting of alternating copolymers of meta-xylene diamine and adipic acid, and the second thermoplastic polymer It is a thermoplastic polymer of polyethylene terephthalate resin or polybutylene terephthalate resin. The artificial hair fiber according to the first aspect of the invention, wherein the first thermoplastic polymer and the second thermoplastic polymer contain a pigment and/or a dye. The artificial hair fiber according to the first aspect of the invention, wherein the first thermoplastic polymer and the second thermoplastic polymer comprise a stabilizer, an antioxidant, and/or an ultraviolet absorber. The fiber for artificial hair according to claim 2, wherein the convex portion is insoluble in alkali but soluble in acid. A wig comprising a first thermoplastic polymer and a second thermoplastic polymer which is incompatible with the first thermoplastic polymer and has a different melting point, and has a concave-convex shape on the surface, and the convex The fiber formed of the first thermoplastic polymer is artificial hair, and includes a plurality of artificial hairs. The structure other than the convex portion has a sea formed by the first thermoplastic polymer. And an island portion formed of the second thermoplastic polymer. A method for producing a fiber for artificial hair, which is a method for producing a fiber for artificial hair having a concave-convex shape on a surface thereof, wherein the first thermoplastic polymer is used as a matrix and is incompatible with the first thermoplastic polymer Further, the second thermoplastic polymer having different melting points is a mixed polymer of fine particles, which is melt-mixed at a temperature equal to or higher than a melting point of the second thermoplastic polymer, and the melt-mixed mixed polymer is in the second The thermoplastic polymer is extruded at a discharge temperature below the melting point to form a fibrous shape. The method for producing an artificial hair fiber according to claim 8, wherein the melting point of the second thermoplastic polymer is as described above The difference in discharge temperature is 10 ° C or more and 30 ° C or less. A method for producing a fiber for artificial hair, which is a method for producing a fiber for artificial hair having a concave-convex shape on a surface thereof, wherein the first thermoplastic polymer as a matrix and the first thermoplastic polymer are incompatible with the first thermoplastic polymer Further, the mixed polymer composed of the second thermoplastic polymer having different melting points is melt-mixed at a melting temperature of at least the melting point of the first thermoplastic polymer and the second thermoplastic polymer, and the melted The mixed mixed polymer is extruded at a discharge temperature of the melting temperature or lower to form a fiber. The method for producing an artificial hair fiber according to claim 10, wherein the first thermoplastic polymer is a polyamide resin, and the second thermoplastic polymer is a polyester resin. The weight ratio of the thermoplastic polymer to the second thermoplastic polymer is in the range of from 99/1 to 70/30. The method for producing an artificial hair fiber according to claim 10, wherein the second thermoplastic polymer has a melting point higher than a melting point of the first thermoplastic polymer. The method for producing an artificial hair fiber according to claim 10, wherein the fibrous mixed polymer is formed by winding the elongated flow range while air-cooling. The method for producing an artificial hair fiber according to claim 10, wherein the fibrous mixed polymer is formed by being air-cooled while being air-cooled in an extended flow range.