JP6970399B2 - Filament for artificial hair and artificial hair products - Google Patents

Description

The present invention relates to artificial hair fibers used for wigs, hair wigs, extensions and the like.

Conventionally, as the fiber for artificial hair, modacrylic fiber, vinyl chloride fiber, vinylidene chloride fiber, polyester fiber, nylon fiber and the like have been used. In making artificial hair products such as wigs, hair wigs, and extensions using these fibers, the development of fibers suitable for these products has been repeated, and the cross-sectional shape of the fibers has also been researched and improved. Has been done.

For example, a fiber for artificial hair having a cross-sectional shape having a crack in the central portion such as a cocoon type or a spectacle type (see, for example, Patent Document 1) has been proposed.

Further, a fiber having a Y-shaped cross section (see, for example, Patent Document 2) and a fiber having a Y-shaped cross section having a rounded tip (see, for example, Patent Document 3) have been proposed.

Japanese Unexamined Patent Publication No. 2007-146306 International Publication No. 2008/029727 Japanese Patent No. 3365141

However, a fiber having a cross-sectional shape having a crack in the central portion as proposed in Patent Document 1 does not give a voluminous feeling, and the fiber always bends in the minor axis direction. For this reason, there is a problem that the directions of the fibers are aligned on the curved surface, the glossiness tends to be unnatural, and it is difficult to express a three-dimensional effect when curled, which has been proposed in Patent Documents 2 and 3. Although the voluminous feeling is improved with the fiber having such a cross-sectional shape, the yarn cracking / breaking is likely to occur due to the external force, and the durability is not satisfactory.

An object of the present invention is to solve the above-mentioned problems in the prior art.

Therefore, an object of the present invention is to provide a filament for artificial hair which is excellent in volume and luster and is less likely to cause thread cracking or thread breakage.

In order to achieve the above object, according to the present invention, it is a filament of a thermoplastic resin, and the shape of the cross section in the direction perpendicular to the fiber axis is a multi-leaf shape having three or more leaf fissures, and the above-mentioned multi-leaf shape. Each leaf has a circular or elliptical bulge, the width of the leaf fissure is 10 to 55% of the width of the filament, and the depth of the leaf fissure is 10 to 30% of the height of the filament. Filaments for artificial hair are provided.

In addition, in the filament for artificial hair of this invention,
The number of leaves of the multi-leaf shape is 3 to 8.
The single thread fineness is 20 to 150 dtex, and the thermoplastic resin is made of polyester resin, polyamide resin, acrylic resin, polyvinyl chloride resin, polyacrylonitrile resin, polyphenylene sulfide resin, and cellulose resin. At least one selected from the above group is mentioned as a preferable condition, and when these conditions are satisfied, even better performance is exhibited.

Further, the artificial hair product of the present invention is characterized in that the artificial hair filament is used for at least a part of the hair material.

According to the present invention, as described below, it is possible to obtain a filament for artificial hair which is excellent in volume and glossiness and is less likely to cause thread cracking or thread breakage.

(A) to (c) are cross-sectional views in a direction perpendicular to the fiber axis of the filament for artificial hair according to one example of the present invention. (D) to (f) are cross-sectional views in a direction perpendicular to the fiber axis of the filament for artificial hair according to another example of the present invention. (G) to (i) are cross-sectional views in the direction perpendicular to the fiber axis of the filament for artificial hair of the comparative example. It is a schematic diagram for demonstrating the container used for the porosity measurement and the measurement. FIG. 5A is a schematic diagram of a sample holder for measuring glossiness to which 11 single threads of a sample are fixed. Further, FIG. 5B is a side view schematically showing the positions of the sample, the light source, and the light receiver at the time of measuring the glossiness.

Hereinafter, the filament for artificial hair of the present invention will be described with reference to the drawings. 1 (a) to 1 (c) and FIGS. 2 (d) to 2 (e) are cross-sectional views in a direction perpendicular to the fiber axis of the filament for artificial hair according to the present invention. In each figure, 1 is a filament for artificial hair, 2 is a leaf fissure, and 3 is a leaf. The leaf fissure portion refers to a groove formed by a recess in the cross section along the fiber axis direction of the filament, but in the present specification, the recess in the cross section is also referred to as a leaf fissure portion. Further, the leaf portion refers to a portion sandwiched between adjacent leaf fissure portions, and the concept applied to any of the filament and the cross section is the same as in the case of the leaf fissure portion.

The filament for artificial hair of the present invention has a multi-leaf shape in which the cross section in the direction perpendicular to the fiber axis has three or more leaf fissures. In the present invention, it is important that the leaf fissure portion has such a specific shape in the same cross section. In the present specification, unless otherwise specified regarding the cutting direction, the cross section means a cross section in the direction perpendicular to the fiber axis.

The multi-leaf shape in the present invention is a shape having a plurality of leaf fissures and leaf portions divided by the fissures, and for example, FIGS. 1 (a) to 1 (c) and FIG. 2 (a) are 3. The leaves, (b) in FIG. 2 are referred to as 4 leaves, the (c) in FIG. 2 is referred to as 5 leaves, and the like.

In the artificial hair filament of the present invention, the width of the leaf fissure (W2) is 10 to 60% of the width of the filament (W1). The ratio of the width of the leaf fissure (W2) to the width of the filament (W1) (hereinafter, may be abbreviated as W2 / W1) is preferably 30% or more, more preferably 40% or more. .. On the other hand, regarding the upper limit, W2 / W1 is preferably 55% or less, and more preferably 50% or less. Further, in the filament for artificial hair of the present invention, the depth (H2) of the leaf fissure portion is 5 to 30% of the height (H1) of the filament. The ratio of the leaf fissure depth (H2) to the filament height (H1) (hereinafter, may be abbreviated as H2 / H1) is preferably 10% or more, and preferably 15% or more. More preferred. On the other hand, regarding the upper limit, H2 / H1 is preferably 25% or less, and more preferably 20% or less. In the present invention, it is said that each value of the filament width (W1), the leaf fissure width (W2), the filament height (H1), and the leaf fissure depth (H2) satisfies the above relationship. It is defined that the above-mentioned values obtained for each leaf fissure satisfy the above-mentioned relationship in all the leaf fissures in the cross section of the filament.

The width of the filament (W1), the width of the leaf fissure (W2), the height of the filament (H1), and the depth of the leaf fissure (H2) are defined as follows. A tangent line is drawn that touches both of two adjacent leaf parts across one leaf fissure, and the maximum value of the distance between the filament contours in the direction parallel to the tangent line is the filament width (W1), the tangent line and the leaf. The distance between the two points of contact with the portion is defined as the width of the leaf fissure (W2). The maximum value of the distance between the contours of the filament in the direction perpendicular to the tangent line is the height of the filament (H1), and the maximum value of the depth of the leaf fissure in the direction perpendicular to the tangent line is the depth of the leaf fissure (H2). And.

If either the ratio of the width of the leaf fissure to the width of the filament (W2 / W1) or the ratio of the depth of the leaf fissure to the height of the filament (H2 / H1) is less than the above range, the hair is treated as artificial hair. In addition to making it difficult to obtain a voluminous feel when used, it is also difficult to obtain a natural luster due to the small irregularities on the filament surface. On the other hand, when any of them exceeds the above range, the leaf portion becomes thin and thread cracking or thread breakage is likely to occur.

The filament for artificial hair of the present invention preferably has a multi-leaf shape with 3 to 8 leaves, more preferably 3 to 6, and even more preferably 3 or 4. If it is outside the above range, it tends to be difficult to satisfy the relationship between the width of the leaf fissure and the width of the filament and the relationship between the depth of the leaf fissure and the height of the filament.

The type of filament may be any type such as multifilament and monofilament, but monofilament is preferable. In the case of a multifilament, it is assumed that the cross-sectional shape of each single yarn constituting the multifilament satisfies the above.

The fineness of the filament for artificial hair of the present invention is preferably 20 to 150 dtex. The fineness is more preferably 30 dtex or more, and further preferably 40 dtex or more. On the other hand, the upper limit is more preferably 130 dtex or less, further preferably 100 dtex or less, and particularly preferably 70 dtex or less. Further, a filament having a single fineness may be used, but filaments having a plurality of finenesses may be used in combination within the above range. Here, the fineness of the filament means that in the case of a multifilament, the average value of the fineness of each single yarn constituting the multifilament is within the above range.

Further, the filament for artificial hair of the present invention is a filament of a thermoplastic resin and may be of any type as long as it is a thermoplastic resin, for example, a polyester resin, a polyamide resin, an acrylic resin, or a polyvinyl chloride resin. , Polyacrylonitrile-based resin, polyphenylene sulfide-based resin, and cellulose-based resin are preferably at least one selected from the group. Among these, polyester-based resins, polyamide-based resins, and polyphenylene sulfide-based resins are particularly preferable.

Further, the filament for artificial hair of the present invention is a matting agent such as titanium oxide, calcium carbonate, kaolin, clay, pigment, dye, lubricant, antioxidant, heat resistant agent, heat resistant agent, light resistant agent, if necessary. , Ultraviolet absorber, antistatic agent, fluorescent agent, plasticizer, antibacterial agent and the like can be contained.

The filament for artificial hair of the present invention may contain known organic or inorganic flame retardants such as phosphorus-based, halogen-based, and antimony trioxide in order to protect the human body from the danger of fire during use.

The filament for artificial hair of the present invention may be a modified polyester constituting the filament for artificial hair, or an antistatic agent, for the purpose of preventing clinging or entanglement due to the electric resistance of the filament, or adhesion of dust. It may be surface-imparted.

In the filament for artificial hair of the present invention, a known surfactant such as silicone may be applied to the surface of the filament in order to further improve combability.

Further, the tensile strength and the knot strength of the filament for artificial hair of the present invention are preferably 1 to 5 cN / dtex and 0.5 to 3 cN / dtex, respectively. Within the above range, the process passability tends to be good at the processing stage of the artificial hair product.

Further, the filament for artificial hair of the present invention preferably has a flexural rigidity of 0.03 to 0.25 cN. Within the above range, it is easy to feel the hair that is close to human hair.

Next, the method for producing the artificial hair filament of the present invention will be described, but the production method is not particularly limited, and a known spinning method can be adopted. Here, melt spinning will be described as an example, but the present invention is not limited to this.

First, various raw materials are charged in the hopper. Here, various additives may be mixed and supplied. Raw materials are supplied from a hopper to a uniaxial extruder type melt spinning device to perform melt spinning. The melting temperature at this time is preferably about + 20 ° C., which is the melting point of the thermoplastic resin used. The molten polymer is weighed according to the final fineness of the filament with a gear pump, filtered through a metal filter in a spinning pack, and spun from a deformed mouthpiece.

Next, the spun undrawn yarn is continuously guided into the cooling medium and cooled and solidified. Examples of the cooling medium include water and polyethylene glycol, but the cooling medium is not particularly limited as long as it can be easily removed from the surface of the filament and does not cause any chemical or physical change.

Then, the undrawn yarn that has been cooled and solidified is heated by one-stage drawing or multi-stage drawing and heat-set in order to obtain the strength required as a filament. Examples of the heat medium used in this case include air, hot water, steam, polyethylene glycol, glycerin, and silicone oil, which can be easily removed from the surface of the filament and undergoes essential chemical and physical changes. It is not particularly limited as long as it is not given.

The artificial hair filament thus obtained is wound up with a finishing oil attached as needed.

The artificial hair filament obtained by the above method may be subjected to known post-processing such as dyeing, alkali treatment, sandblasting, crimping, yaki processing and curling processing, if necessary.

The artificial hair product of the present invention uses the above-mentioned artificial hair filament as at least a part of the hair material, and includes wigs, hair wigs, hair pieces, extensions, hair extensions, doll hair, hair ornaments and the like. These artificial hair products can be manufactured by a known method, and the manufacturing method of the artificial hair product itself is not particularly limited.

Hereinafter, the description will be made specifically with reference to examples, but the present invention is not limited thereto. In Examples and Comparative Examples, the filament for artificial hair and the artificial hair were evaluated by the following methods. In each test, the measurement was performed after the sample was left to stand for 24 hours or more under the conditions of a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 4%. Unless otherwise specified, the number of measured n was set to 1.

(1) Fineness Four samples of exactly 500 mm were taken under the initial load specified in JIS L 1013: 2010, the mass was measured, and the fineness was calculated by the following formula.

Fineness [dtex] = mass [g] x 10000/2.

(2) Cross-sectional shape A filament sample of 30 m was cut every 1 m, and 5 samples were arbitrarily extracted from the filament sample. A cross-section observation sample was prepared by cutting out five extracted samples in the direction perpendicular to the fiber axis direction of the filament. These samples were observed using a digital microscope (VHX-500F, manufactured by KEYENCE CORPORATION), and the following lengths were measured with the main measurement tool.

Draw a tangent line that touches both of the two adjacent leaf parts across one leaf fissure, and the maximum value of the distance between the filament contours in the direction parallel to the tangent line (filament width W1), the tangent line and the leaf. The distance between the two contacts with the portion (width of the leaf fissure, W2), the maximum value of the distance between the contours of the filament in the direction perpendicular to the tangent (filament height, H1), and the direction perpendicular to the tangent. The maximum value of the depth of the leaf fissure (depth of the leaf fissure, H2) was measured. These values were measured for each leaf fissure of each sample. Table 1 shows the results of each leaf fissure for one sample as a representative.

(3) Physical characteristics test According to JIS L 1013: 2010 8.5.1 and 8.6.1, the filament has tensile strength [N] and elongation [%], nodule strength [N] and elongation [%]. Were measured respectively. For the measurement, a flat chuck was attached to an Autograph AG-50NIS manufactured by Shimadzu Corporation, and a test of n = 5 was performed under the conditions of a sample length of 25 cm and a tensile speed of 30 cm / min.

(4) Feeling of volume An artificial hair bundle having a length of 40 cm and a mass of 150 g was prepared, and a comparison with the same amount of human hair sample by sensory evaluation was performed by 10 people. The evaluation criteria are as follows.

○ ・ ・ It was judged that 8 or more people had the same volume as human hair.
△ ・ ・ 5 to 7 people judged that they had the same volume as human hair.
× ・ ・ The number of people who judged that they had the same volume as human hair was 4 or less.

(5) Porosity Prepare a bundle of straight artificial hair with a length of 10 cm. A predetermined amount of this sample is placed in a container shown in FIG. 4 in parallel in the length direction, a load of 27 g (10 × 10 × 100 mm aluminum square material) is applied, and 5 to 10 seconds after the load is applied. In the meantime, the height h [mm] was measured. Moreover, the mass m [g] of the sample in the container was measured. The predetermined amount means an amount such that the height after the load is applied is 5 to 10 mm.

Next, using the same sample, a sample for cross-section observation cut out in the direction perpendicular to the fiber axis direction of the filament was observed using a digital microscope (VHX-500F, manufactured by KEYENCE CORPORATION), and the main measurement was performed. The cross-sectional area A [mm ² ] of the single yarn was measured using a tool. For the cross-sectional area, n = 50 was measured and the average value was obtained.

From the above measured values, the porosity was calculated using the following formula.

(6) Glossiness (G value, half width)
As a gloss meter, "GP-200" manufactured by Murakami Color Technology Research Institute was used, and as shown in Fig. 5 (a), a sample holder with a hole with a diameter of 36 mm was used in the center, and from the center line. Using 11 single threads of the sample fixed at equal intervals within a total width of 6 mm, 3 mm on each side, as a sample, the diameter of the light source aperture is 10.5 mm and the diameter of the light receiving aperture is 9.1 mm, as shown in FIG. 5 (b). The reflectance with respect to the reflection angle was measured by shining light at an incident angle of 30 ° and rotating the light receiver by 0 to 90 °. The G value is calculated from the reflectance d at a reflection angle of 0 ° and the maximum reflectance Sf appearing near the reflection angle of 30 ° by the following equation (2), the sample is changed for each measurement, and the average value at n = 5. Was calculated. The G value is an index of glossiness, and the larger the G value, the stronger the glossiness due to specular reflection, that is, the stronger the glossiness.

G value = Sf / d ... Equation (2)
For the full width at half maximum, the average value of the values (n = 5) obtained for each of the above measurements was calculated. The half-value width is an index of glare, and the smaller the half-value width, the more directional the reflection and the more glare, indicating that the glossiness is stronger.

(7) Glossiness A bundle of straight artificial hair with a length of 40 cm and a mass of 150 g is compared with a human hair bundle near a window in a room exposed to direct sunlight, and is visually observed at an incident angle of 10 ° to 55 °. Judgment was carried out. In addition, the same amount of artificial hair bundle was curled using a curling iron with a diameter of 32 mm under the condition of 130 ° C for 30 seconds, and the incident of sunlight was compared with that of human hair bundle at the window of a room exposed to direct sunlight. Visual judgment was performed at an angle of 10 ° to 55 °. Each evaluation standard is as follows.

○ ・ ・ Dull luster similar to human hair,
△ ・ ・ Slightly strong luster,
× ・ ・ Strong luster.

(8) Thread cracking / thread breaking test An artificial hair bundle with a length of 30 cm and a mass of 11 g is prepared, and one end of the hair bundle is fixed. On a horizontal table, roll a spherical weight with a mass of 5 kg in a direction perpendicular to the length of the hair 20 times, and then comb it with a metal wig brush until the hair bundles are no longer entangled. After repeating this 5 times, the hair bundle was observed with a microscope. The evaluation criteria are as follows.

○ ・ ・ No thread cracking or thread breakage at the ends of the hair was observed.
× ・ ・ In some cases, thread cracking and thread breakage at the ends of the hair were observed.

(9) Flexural rigidity A filament sample cut to a length of about 4 cm was prepared. Set the sample so that it touches under two stainless steel rods with a diameter of 2 mm installed at 10 mm intervals in the horizontal direction, and hang a stainless steel hook with a diameter of 1 mm on the sample at the center of the stainless steel rods, manufactured by Menebea Co., Ltd. Using the "TCM-200 type universal tensile / compression tester", the stainless steel hook was pulled up at a speed of 50 mm / min, and the maximum stress generated at this time was set as the bending hardness. The measurement was set to n = 3, and the average value was calculated.

[Example 1]
A polyethylene terephthalate chip having an extreme viscosity (measured at 25 ° C. in a mixed solvent of phenol and tetrachloroethane 1: 1) containing 2.5% by mass of cohesive silicon oxide particles (average particle size 2.43 μm) of 0.97. , Dryed under vacuum at 165 ° C. for 9 hours. The chips are supplied to an extrusion type spinning machine at 285 ° C., the heat-melted resin composition is extruded from a three-leaf nozzle corresponding to the thread cross-sectional shape of FIG. 1 (a), and immediately cooled in water at 30 ° C. Then, after stretching 4.1 times in warm water at 55 ° C. and further under dry heat at 100 ° C., relaxation heat treatment was performed in a dry heat atmosphere.

Next, the wound monofilament was immersed in a sodium hydroxide solution as an alkaline treatment to dissolve the surface of the hair material, washed with water, and dried to obtain a straight polyester monofilament.

This polyester monofilament was dyed black using a conventional dyeing method using a high-pressure dyeing machine, and then reduced-washed using a conventional cleaning method to obtain a straight dyed monofilament for artificial hair.

The characteristics of the obtained filament for artificial hair are shown in Table 1.

[Example 2]
Using a polyethylene terephthalate chip with an extreme viscosity of 1.10 containing 1.5% by mass of colloidal silica (Fuji Silysia Chemical Ltd. Silicia 730), the extrusion nozzle was made of three leaves corresponding to the thread cross-sectional shape of FIG. 1 (c). A straight monofilament for artificial hair was obtained in the same manner as in Example 1 except that the nozzle was changed.

The characteristics of the obtained filament for artificial hair are shown in Table 1.

[Examples 3, 4, Comparative Examples 1 to 3]
A straight monofilament for artificial hair was obtained in the same manner as in Example 2 except that the extrusion nozzle was changed to a nozzle corresponding to each shape shown in Table 1.

The characteristics of the obtained filament for artificial hair are shown in Table 1.

From Table 1, it was confirmed that the filament for artificial hair of the embodiment of the present invention was excellent in voluminous feeling and glossy feeling, and was less likely to cause thread cracking or thread breakage.

On the other hand, filaments for artificial hair (Comparative Examples 1 to 3) having a cross-sectional shape that does not satisfy the conditions of the present invention not only have an unnatural feeling of volume and luster, but are also prone to thread cracking and thread breakage, and artificial hair. It was unsuitable for use as a filament.

1 Filament for artificial hair 2 Leaf fissure 3 Leaf 4 Load 5 Sample holder 6 Light source 7 Incident angle (30 °)
8 Receiver (position with a reflection angle of 0 °)
9 Receiver (position with a reflection angle of 90 °)
H1 Filament height H2 Leaf fissure depth W1 Filament width W2 Leaf fissure width

Claims (2)

A polyethylene terephthalate filament having a multi-leaf shape having a cross section perpendicular to the fiber axis having 3 or 4 leaf fissures, and each leaf portion of the multi-leaf shape has a circular or elliptical bulge. ,
If leaves cleft is 3, to the width of the leaf cleft is 40 to the width of the filament 55 percent, Ri 26% der to the depth of the leaves cleft 13 no height filament,
If leaves cleft is 4, 40 to 45% of the width of the leaf cleft filament, 18 to 20% der Ru artificial hair filaments depth leaves cleft of the filament height. An artificial hair product in which the filament for artificial hair according to claim 1 is used for at least a part of the hair material.

Images