JP2007119958A - Fiber for artificial hair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber for artificial hair, having natural gloss and touch feeling resembled to the human hair, excellent combability and curling characteristics, and also excellent fiber properties such as strength and elongation. <P>SOLUTION: The fiber for the artificial hair having 10-100 dtex single fiber fineness has a cross-section shape of the single fiber characterized by continuous unevenness formed at 5-20 μm pitch, and having 2.5-10 μm difference between the high and low positions on the outer periphery of the cross section. As a result, the fiber for the artificial hair, having the natural gloss and touch feeling resembled to the human hair, the excellent combability and curling characteristics, and also the excellent fiber properties such as strength and elongation can be provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fiber for artificial hair, and more specifically, it is used as a fiber for artificial hair for hair decoration such as wigs, blades, extension hairs, etc., gloss, hue, texture, bulkiness similar to human hair The present invention relates to a modified cross-section fiber having properties, a fiber for artificial hair using the modified cross-section fiber, and a method for producing the modified cross-section fiber.

Generally, synthetic fibers used for hair include acrylonitrile fiber, vinyl chloride fiber, vinylidene chloride fiber, polyester fiber, polyamide fiber, polyolefin fiber and the like. Traditionally, these fibers have been used to make products for artificial hair such as wigs, blades, and extension hairs, but these fibers are necessary as artificial hair fibers for heat resistance, curling properties, touch, etc. Because there is no one that has all of the characteristics at the same time, when manufacturing a head ornament product, it is not possible to produce a product that satisfies various characteristics with a single fiber, and products that are tailored to the characteristics of each fiber are made and used. In addition, the cross-sectional shape of the fiber suitable for each commercial property has been studied and improved.
For example, a wig filament (Patent Document 1) in which the length of the longest portion L, the diameter W of the circular portion at both ends, and the width C of the constricted portion at the center is limited to a specific range in the saddle-shaped cross-sectional shape, The four unit filaments having a substantially circular or elliptical shape have a Y-shaped cross section in which the other three unit filaments are radially adjacent to each other at equal intervals with respect to one unit filament. Have a cross-sectional shape in which at least two flat circles are partially overlapped, and the length of the short axis of the wig and the blade filament (Patent Document 2) connected with a width substantially equal to the radius of the unit filament. The ratio L / W between the length W and the length L of the long axis, the distance C between the centers of two adjacent flat circles, and the angle between the straight line connecting the centers of the two flat circles and the long axis of the flat circle, etc. Limited wig for filler Such as cement (Patent Document 3) and the like.
However, all of the fibers developed as conventional artificial hair fibers as described above have a unique shape limited by numerical values with extremely limited length and angle of the fiber cross-sectional shape, and are not necessarily manufactured. In addition to being not easy, it does not necessarily have a favorable texture when used for blades or extension hairs, and tends to be a fiber with a hard tactile feel because emphasis is placed on maintaining style and straightness. In addition, it was not sufficient in terms of ease of handling during manual work. In addition, flat fibers have been widely used for piles in the past, but they are considered unsuitable for use as artificial hair fibers because they have a feeling of stickiness and the like as artificial hair fibers such as wigs. It was.

  Further, a modified cross-section fiber (Patent Document 4) having a shape in which two or more circles or flat circles are partially overlapped or in contact with each other and has a convex portion and / or a concave portion at the peripheral edge portion has been proposed. However, the invention about the size and continuity of the unevenness has not been reached, and the effect of the unevenness other than the above-mentioned shape could not be found.

For this reason, the fiber cross-sectional shape has at least one modified cross-sectional shape selected from the group consisting of an ellipse, a crossed circle, a saddle shape, a daruma shape, a dogbone shape, a ribbon shape, a 3-8 leaf shape, and a star shape. A polyester-based filament (Patent Document 5) was invented and the above problems were suitably improved. However, the gloss of the fiber appearance is still slightly higher than that of human hair, and particularly similar to human hair. Therefore, further improvement has been desired.
Japanese Utility Model Publication No. 48-13277 Japanese Utility Model Publication No. 63-78026 Japanese Patent Laid-Open No. 55-51802 Japanese Patent Laid-Open No. 10-168647 JP 2005-120533 A

  An object of the present invention is to provide a fiber for artificial hair that has natural luster and touch similar to human hair, is excellent in combing and curling characteristics, and is excellent in fiber properties such as high elongation.

  As a result of intensive studies to solve the above problems, the present inventors have completed the present invention by setting the cross-sectional shape of the fiber to a specific irregular cross-section.

  That is, the present invention is an artificial hair fiber characterized in that, in a fiber for artificial hair having a single fiber fineness of 10 to 100 dtex, it has continuous irregularities with a pitch of 5 to 20 μm on the outer periphery of the cross section, preferably The present invention relates to a fiber for artificial hair in which the height of the concave and convex portions on the outer periphery is 2 to 10 μm, the total number of convex portions on the outer periphery is 8 to 40, and the concave and convex portions are continuously formed for two cycles or more. .

  The irregularities on the outer periphery are made of a combination selected from arbitrary straight lines, arcs, and curves, preferably formed by continuous arcs, and used for artificial hair that is ejected and molded from a nozzle having an arc radius of 0.10 mm or less. Regarding fiber.

  Further, the basic shape of the cross section has at least one shape selected from the group consisting of a circle, an ellipse, a cross circle, a saddle shape, a daruma shape, a dog bone shape, and a ribbon shape, preferably on the outer periphery. The present invention relates to a fiber for artificial hair having no irregularities in the vicinity of the neck portion of the basic shape.

  The fiber for artificial hair of the present invention relates to a fiber for artificial hair made of a thermoplastic resin typified by polyvinyl chloride fiber, polyamide fiber and polyester fiber, and preferably made of polyester fiber.

  The polyester contains 5 to 30 parts by weight of a bromine-containing flame retardant (B), an antimony compound (100 parts by weight) based on 100 parts by weight of a polyester (A) composed of at least one of polyalkylene terephthalate and polyalkylene terephthalate. C) A polyester-based artificial hair fiber formed from a composition comprising 0.5 to 10 parts by weight and a dispersant (D) 0.05 to 3 parts by weight, preferably the polyester (A) is It is at least one polymer selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, and the bromine-containing flame retardant (B) component is a brominated aromatic flame retardant, bromine-containing phosphate ester flame retardant Brominated polystyrene flame retardant, brominated benzyl acrylate flame retardant, At least one selected from the group consisting of an elementalized epoxy flame retardant, a brominated phenoxy flame retardant, a brominated polycarbonate flame retardant, a tetrabromobisphenol A derivative, a bromine-containing triazine compound, and a bromine-containing isocyanuric acid compound The above-mentioned polyester-based artificial hair fiber, which is a compound and the antimony compound (C) component is at least one antimony compound selected from the group consisting of antimony trioxide, antimony tetraoxide, antimony pentoxide, and sodium antimonate, The dispersant (D) is a montanic acid wax, a montanic acid ester wax, a partially saponified montanic acid wax, a montanic acid metal salt, a polyethylene wax, a polyethylene oxide wax, polytetrafluoroethylene, a fluorine-modified wax, a poly Dimethylsilico , It relates to an artificial hair fiber which is a compound consisting of one or more modified silicone resin.

  Furthermore, the above-mentioned polyester-based artificial hair fibers containing 0.1 to 5 parts by weight of organic fine particles (E) and / or inorganic fine particles (F) with respect to 100 parts by weight of polyester (A), more preferably organic fine particles ( E) is at least one selected from the group consisting of polyarylate, polyamide, fluororesin, silicone resin, cross-linked acrylic resin and cross-linked polystyrene, the polyester-based artificial hair fiber, and the inorganic fine particles (F) are calcium carbonate Further, the present invention relates to the above polyester-based artificial hair fiber, which is at least one selected from the group consisting of silicon oxide, silica / melamine resin composite, titanium oxide, aluminum oxide, zinc oxide, talc, kaolin, montmorillonite, bentonite and mica.

  According to the present invention, artificial hair fibers with excellent curling properties, which have been obtained with natural fiber cross-sections that have not been obtained with conventional fiber cross-sections, have a natural luster and tactile sensation closer to human hair, and maintain good fiber properties. Can be obtained.

  Hereinafter, the present invention will be described in detail.

  As for the fineness of the fiber for artificial hair used in the present invention, the single fiber fineness is usually 10 to 100 dtex, and further 20 to 90 dtex is generally suitable for artificial hair.

  In the fiber for artificial hair of the present invention, by specifying the cross-sectional shape of the fiber, that is, the cross-sectional shape having concavities and convexities on the outer periphery of the cross-section, the pitch of the concavities and convexities, the height, the total number of convex portions, By specifying, the gloss can be suppressed uniformly and efficiently over the entire length of the fiber without causing partial uneven gloss.

  The pitch means a period of continuous irregularities, and specifically, as shown by 2 in FIG. 1, the distance from the apex of a certain convex part to the apex of an adjacent convex part, or the concave part It means the distance from the bottom point to the bottom point of the adjacent recess.

  In the present invention, the uneven pitch on the outer periphery is preferably 5 to 20 μm, and more preferably 8 to 16 μm. If the pitch of the unevenness exceeds 20 μm, the unevenness tends to be too smooth and it becomes difficult to obtain the desired gloss suppression effect. If the pitch is less than 5 μm, the unevenness is too fine and the desired gloss suppression is suppressed. It tends to be difficult to obtain an effect.

  The height of the concave and convex portions on the outer periphery in the present invention is preferably 2.5 to 10 μm, and more preferably 4 to 8 μm. In addition, the height of the said recessed part and a convex part is the distance to the vertex of a convex part on the basis of the straight line or curve (1 in FIG. 1) which forms the basic shape of a cross section, and the bottom point of a recessed part. A value obtained by averaging the sum of absolute values of distances (3 in FIG. 1) into a value per pair of irregularities in consideration of the number of irregularities is shown. When the height is more than 10 μm, when it is made into a hair product, it is fitted to the unevenness of other adjacent yarns, the tactile sensation and combing are deteriorated, and the appearance tends to be unnatural. On the other hand, if the height is less than 2.5 μm, notably unevenness is not formed, and it tends to be difficult to obtain a gloss suppressing effect.

  In the present invention, in the unevenness on the outer periphery, the total number of convex portions is preferably 8 to 40, more preferably 12 to 32. The upper limit of the total number of convex portions is limited by the single yarn fineness and the basic shape of the cross section, that is, the outer circumference length of the cross section, and the pitch of the unevenness, but in the normally used fineness range of 10 to 100 dtex From the viewpoint of nozzle processing, the number is preferably 40. If the total number of convex portions is less than 8, the number of irregularities is too small, that is, the proportion of the basic shape without irregularities on the outer periphery of the cross section is large, and is obtained by the basic shape cross section when no irregularities are formed. It becomes the same as the characteristic and tends to make it difficult to obtain a desired effect.

  In the present invention, the irregularities are preferably formed continuously for 2 cycles or more, and more preferably 4 or more. If the unevenness formed continuously is less than two cycles, it tends to be difficult to obtain a desired effect as described above.

  The unevenness on the outer periphery of the fiber in the present invention can be formed from any combination selected from arbitrary straight lines, arcs, and curves. For example, the concavo-convex pointed portion may be formed by a gentle arc, and the other portion may be formed by a straight line, or may be formed by a combination of an arc and an arc or an arbitrary curve. Although it may be a combination of only straight lines, in order to obtain a natural appearance and tactile sensation similar to human hair, it is preferable that the concavo-convex tip is formed by an arc or a curve. For example, when the nozzle hole shape consists of a combination of straight lines only, that is, even if it is uneven as if it were a gear, the top and bottom of the unevenness are actually localized due to the flow and solidification behavior of the resin. It is clear that there is a smooth curve.

  In the present invention, the fiber cross-sectional shape of the artificial hair fiber can be controlled by using a nozzle hole having a shape close to the target fiber cross-sectional shape.

Furthermore, the unevenness on the outer periphery is preferably formed by a continuous arc, since the uneven shape of the fiber after spinning is suitably maintained and a natural appearance and tactile sensation similar to human hair are easily obtained.
Further, in this case, it is preferable to discharge and mold from a nozzle having a radius of the arc of 100 μm or less from the viewpoint of nozzle design, ease of processing, and ease of fiberization.

  As a method for drilling nozzle holes, conventionally known methods represented by wire cutting, electric discharge machining, and the like can be used. If the radius of the arc in the nozzle hole exceeds 0.10 mm, the ratio of the area occupied by the unevenness to the basic shape of the cross section is large, and it is difficult to obtain a fiber having unevenness of a preferable size as described above. become.

  The basic shape of the cross section of the artificial hair fiber of the present invention has at least one shape selected from the group consisting of a circle, an ellipse, a cross circle, a saddle shape, a daruma shape, a dog bone shape, and a ribbon shape. However, it is preferable from the viewpoint of cosmetic properties such as appearance, touch, combing, and curl retention. In the artificial hair fiber of the present invention, irregularities may be formed over the entire outer periphery of the cross section, but as a basic shape of the cross section, two or more circles or flat circles may be partially overlapped When selecting a shape having a constriction in contact with each other, that is, a saddle shape, a daruma shape, or a dogbone shape, it is preferable not to form irregularities in the vicinity of the constricted portion of the basic shape. When irregularities are formed in the vicinity of the constricted part, the convex part in the vicinity of the constricted part comes close to the other convex part that opposes.Therefore, in the spinning process, there is a problem that fusion occurs in the filament cross section due to the die swell effect of the spinning polymer. This is because it often occurs.

  In the artificial hair fiber of the present invention, by combining fibers having different cross-sectional shapes with different pitches, heights and heights, and different numbers of protrusions, an unnaturally uniform appearance and tactile sensation that is common in artificial hair fibers. In addition, a natural look and feel similar to human hair can be obtained.

In the fiber for artificial hair of the present invention, in addition to the fiber having unevenness on the outer periphery of the cross section, a combination of fibers having no unevenness on the outer periphery of the cross section within a range not impairing the effect of the present invention. May be.
Examples of the fiber material used in the present invention include generally used acrylonitrile fiber, vinyl chloride fiber, vinylidene chloride fiber, polyester fiber, polyamide fiber, and polyolefin fiber. Among these, the polychlorinated polyacrylamide is used because it satisfies the heat resistance and fiber properties required for artificial hair fibers and is relatively easy to handle in each processing step such as resin processing, spinning, stretching, and heat treatment. Vinyl resins, polyamide resins, and polyester resins are preferable, and polyester resins are more preferable from the viewpoint of fiber physical properties such as strength and heat resistance, and moisture management and melt spinning processability.

  Moreover, when using the atypical cross-section fiber according to the present invention as described above for artificial hair, a free style as a hair product can be created by blending with human hair at an arbitrary ratio. In addition to the human hair, other conventionally used hair fibers for artificial hair such as acrylonitrile fiber, vinyl chloride fiber, vinylidene chloride fiber, polyester fiber, polyamide fiber, polyolefin fiber, etc. It can also be used in a blend.

  As the polyester fiber used in the present invention, a polyester typified by polyethylene terephthalate may be used alone, but those given flame retardancy are preferable from the viewpoint of safety, for example, polyalkylene terephthalate or polyalkylene. Composition comprising polyester (A) comprising at least one copolymerized polyester mainly composed of terephthalate, bromine-containing flame retardant (B), antimony compound (C), and plasticizer and / or lubricant (D) More preferably, a fiber obtained by melt spinning is used.

  In addition, the polyester fiber used in the present invention is not only flame retardant and heat resistant, it is also difficult to drip at the time of combustion, and is excellent as a fiber for hair having a natural luster that is moderately matte like human hair. It is more preferable to use a polyester fiber having characteristics.

  Below, the polyester-type resin composition which can be used for this invention is demonstrated in detail.

  Examples of the polyalkylene terephthalate contained in the polyester (A) used in the present invention or a copolymerized polyester mainly composed of polyalkylene terephthalate include polyalkylene terephthalates such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate and / or these. Examples thereof include copolymer polyesters mainly composed of polyalkylene terephthalate and containing a small amount of a copolymer component. As the polyalkylene terephthalate, polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate are particularly preferable from the viewpoint of availability and cost. The main component means containing 80 mol% or more.

  The polyalkylene terephthalate and the copolyester may be used singly or in combination of two or more.

  The intrinsic viscosity of the polyester (A) used in the present invention is preferably 0.5 to 1.4, and more preferably 0.6 to 1.2. When the intrinsic viscosity of the polyester (A) is less than 0.5, the mechanical strength of the resulting fiber tends to decrease. When it exceeds 1.4, the melt viscosity increases with increasing molecular weight, It becomes difficult and the fineness tends to be non-uniform.

  The bromine-containing flame retardant (B) used in the present invention is not particularly limited, and any bromine-containing flame retardant generally used can be used. From the viewpoint of imparting flame retardancy, bromine-containing phosphate ester flame retardant, brominated polystyrene flame retardant, brominated benzyl acrylate flame retardant, brominated epoxy flame retardant, brominated phenoxy resin flame retardant, brominated polycarbonate Flame retardants, tetrabromobisphenol A derivatives, bromine-containing triazine compounds, bromine-containing isocyanuric acid compounds are preferred. From the viewpoint of fiber properties, heat resistance and processing stability, bromine-containing phosphate ester flame retardants, brominated epoxies More preferred are flame retardants and brominated phenoxy resin flame retardants.

  The amount of the bromine-containing flame retardant (B) used in the present invention is preferably 5 to 30 parts by weight, more preferably 6 to 25 parts by weight, and even more preferably 7 to 20 parts by weight with respect to 100 parts by weight of the polyester (A). . If the amount of bromine-containing flame retardant (B) used is less than 5 parts by weight, the flame retardant effect tends to be difficult to obtain, and if it exceeds 30 parts by weight, the mechanical properties, heat resistance, and drip resistance of the resulting fiber are impaired. Tend.

  In this invention, although a flame retardance is expressed by mix | blending a bromine containing flame retardant (B), a flame retardant effect can be improved significantly by mix | blending an antimony compound (C) component.

  The antimony compound (C) used in the present invention is not particularly limited, and specific examples include antimony trioxide, antimony tetroxide, antimony pentoxide, and sodium antimonate. Of these, sodium antimonate is preferred from the viewpoint of the spinnability of the composition.

  The average particle size of the antimony compound (C) in the present invention is preferably 0.02 to 15 μm, more preferably 0.1 to 12 μm, and further preferably 0.2 to 10 μm.

  The amount of the antimony compound (C) used in the present invention is preferably 0.5 to 10 parts by weight, more preferably 0.6 to 9 parts by weight, and 0.7 to 7 parts by weight with respect to 100 parts by weight of the polyester (A). Part is more preferable. When the amount of the antimony compound (C) used is less than 0.5 parts by weight, the improvement of the flame retardancy tends to be small, and when it exceeds 10 parts by weight, the processing stability, appearance, and transparency tend to be impaired. is there.

  In the present invention, by using the dispersant (D), the dispersion state of the antimony compound (C) is improved, so that the spinning stability is improved, the fiber surface is not rough, and the fiber surface The slipperiness can be imparted to the filament, and a comb-like filament can be obtained.

  As the dispersant (D) used in the present invention, a plasticizer or a lubricant can be used. The plasticizer or lubricant is not particularly limited, and any plasticizer or lubricant can be used as long as it is generally used. Specific examples of plasticizers or lubricants include, for example, montanic acid wax, montanic acid ester wax, partially saponified montanic acid wax, montanic acid metal salt, polyethylene wax, polyethylene oxide wax, polytetrafluoroethylene, Fluorine-modified wax, polydimethylsilicone, and modified silicone resin are preferred because they have little influence on fiber properties such as dispersibility, flame retardancy, and heat resistance of the antimony compound. These compounds may be used alone or in combination of two or more.

  The amount of the dispersant (D) used in the present invention is preferably 0.05 to 3 parts by weight, more preferably 0.1 to 2.5 parts by weight, based on 100 parts by weight of the polyester (A). 0.15 to 2 parts by weight is more preferable. When the amount of the dispersant (D) used is less than 0.05 parts by weight, the antimony compound particles (C) are partially agglomerated, and there is a tendency that yarn breakage occurs during the spinning process or the tactile sensation on the surface of the fiber is felt. When the amount exceeds 3 parts by weight, the spinning stability is lowered and yarn breakage occurs, and mechanical properties, heat resistance, flame retardancy, and drip resistance tend to be impaired.

  The fiber for flame-retardant polyester-based artificial hair of the present invention forms fine protrusions on the surface of the resulting fiber by further mixing the organic fine particles (E) and / or the inorganic fine particles (F). Gloss and gloss can be adjusted.

  The organic fine particles (E) in the present invention can be used as long as they are organic resins having a structure that is incompatible with or partially incompatible with the flame retardant polyester (A) as the main component. Polyarylate, polyamide, fluororesin, silicone resin, crosslinked acrylic resin, crosslinked polystyrene and the like are preferably used. These may be used alone or in combination of two or more. In order to stably exhibit the gloss adjusting effect, crosslinked polyester particles and crosslinked acrylic particles are preferable from the viewpoint of heat resistance and dispersibility.

  As the inorganic fine particles (F) used in the present invention, those having a refractive index close to the refractive index of the flame retardant polyester (A) are preferable from the viewpoint of the effect on the transparency and color developability of the fiber. Examples thereof include silicon oxide, titanium oxide, aluminum oxide, zinc oxide, talc, kaolin, montmorillonite, bentonite and mica. These may be used alone or in combination of two or more. Among these, fine particles close to a spherical shape have a higher gloss adjusting effect, and composite particles mainly composed of silicon oxide and silicon oxide are preferable. The inorganic fine particles (F) used in the present invention may be surface-treated with an epoxy compound, a silane compound, an isocyanate compound, a titanate compound or the like as necessary.

  The average particle size of the organic fine particles (E) and / or inorganic fine particles (F) used in the present invention is preferably from 0.1 to 15 μm, more preferably from 0.2 to 10 μm, still more preferably from 0.5 to 8 μm. When the average particle size of the organic fine particles (E) and / or inorganic fine particles (F) is smaller than 0.1 μm, the gloss adjustment effect tends to be small, and when it is larger than 15 μm, the gloss adjustment effect is small. Or yarn breakage tends to occur.

  The amount of the organic fine particles (E) and / or inorganic fine particles (F) used in the present invention is not particularly limited, but is 0.1 to 5 weights based on 100 weight parts of the polyester (A). Part is preferable, 0.2 to 3 parts by weight is more preferable, and 0.3 to 2 parts by weight is further preferable. When the amount of the organic fine particles (E) and / or inorganic fine particles (F) used is less than 0.1 parts by weight, the fine protrusions formed on the fiber surface are reduced, and the gloss adjustment effect on the fiber surface tends to be reduced. Yes, when it exceeds 5 parts by weight, appearance, hue, and color developability tend to be impaired.

  The polyester-based artificial hair fiber obtained in the present invention includes, for example, polyester (A), bromine-containing flame retardant (B), antimony compound (C) and dispersant (D), and organic fine particles (E) or inorganic fine particles. After dry blending (F), the polyester composition obtained by melt-kneading using various general kneaders can be obtained by melt spinning using a single-screw extruder.

  Examples of the kneader used for the production of the resin composition include, for example, a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, and a kneader. Among these, a twin screw extruder is preferable from the viewpoint of adjusting the degree of kneading and ease of operation.

  For example, using a twin screw extruder with a screw diameter of 45 mm, the barrel temperature is 260 to 300 ° C., the discharge amount is 50 to 150 kg / hr, the melt is kneaded at a screw rotation speed of 150 to 200 rpm, the strand is taken out from the die, and water-cooled. Later, the composition of the present invention can be obtained by pelletizing with a strand cutter.

  When the polyester-based artificial hair fiber of the present invention is melt-spun by a normal melt-spinning method, for example, the temperature of the extruder, gear pump, nozzle (die), etc. is set to 270 to 310 ° C., melt-spun, spun, and spun. After passing the drawn yarn through a heating tube, the yarn is cooled to below the glass transition point and taken up at a speed of 50 to 5000 m / min to obtain a spun yarn. It is also possible to control the fineness by cooling the spun yarn in a water tank containing cooling water. The temperature and length of the heating cylinder, the temperature and blowing amount of the cooling air, the temperature of the cooling water tank, the cooling time, and the take-up speed can be appropriately adjusted depending on the discharge amount and the number of holes in the die.

  A composition obtained by dry blending polyester (A), bromine-containing flame retardant (B), antimony compound (C), plasticizer and / or lubricant (D), and organic fine particles (E) or inorganic fine particles (F). The product can be obtained by melt spinning using a twin-screw extruder equipped with a gear pump and a spinning nozzle or a single-screw extruder using a screw having kneading ability without taking out the resin composition once.

  Furthermore, polyester (A), antimony compound (C), plasticizer and / or lubricant (D), and organic fine particles (E) or inorganic fine particles (F) are melt-kneaded, melt-spun and fiberized. Thereafter, the polyester-based artificial hair fiber of the present invention can be obtained by exhausting the bromine-containing flame retardant (B).

  In the present invention, the obtained spun yarn is hot-drawn, but the drawing is a two-step method in which the spun yarn is once wound and then drawn, and the direct spinning drawing in which the drawn yarn is continuously drawn without being wound. Any of the methods may be used. The hot stretching is performed by a one-stage stretching method or a multi-stage stretching method having two or more stages. As a heating means in the heat stretching, a heating roller, a heat plate, a steam jet device, a hot water tank, or the like can be used, and these can be used in combination as appropriate.

  The polyester-based artificial hair fiber of the present invention contains various additives such as heat-resistant agents, light stabilizers, fluorescent agents, antioxidants, antistatic agents, pigments, plasticizers, and lubricants as necessary. Can be made.

  The polyester-based artificial hair fiber of the present invention thus obtained has heat resistance that can be used for beauty heat appliances (hair irons) at 160 to 200 ° C., is difficult to ignite, and has self-extinguishing properties. It is preferable.

  The polyester-based artificial hair fibers of the present invention can be used by coloring or dyeing them. When coloring by dyeing, it can be dyed under the same conditions as ordinary polyester fibers. In addition, in the case of the original attachment, the original attachment fiber can be obtained by melt-kneading the pigment used for a normal polyester fiber.

  As pigments, dyes, auxiliaries and the like used for dyeing, those having good weather resistance and flame retardancy are preferable.

  The polyester-based artificial hair fiber of the present invention is excellent in curl setting using a beauty heat instrument (hair iron) and excellent in curl retention. Further, the surface of the fiber is moderately matted due to the unevenness of the fiber surface, and can be used as an artificial hair. Furthermore, using oil agents, such as a fiber surface treating agent and a softening agent, a touch feeling and a feeling can be provided, and it can be made closer to human hair.

  The fiber for artificial hair of the present invention can be used as a hair ornament product such as a wig, a blade, a hair accessory, or a doll's hair by further processing.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these.

  In addition, the measuring method of a characteristic value is as follows.

(Strength and elongation)
The tensile strength / elongation of the filament is measured using INTESCO Model 1 201 manufactured by Intesco. A filament having a length of 40 mm is taken, and 10 mm on both ends of the filament is sandwiched with a backing sheet (thin paper) to which a double-sided tape glued with an adhesive is applied, and air-dried overnight to prepare a sample having a length of 20 mm. A sample is mounted on a testing machine, a test is performed at a temperature of 24 ° C., a humidity of 80% or less, a load = 0.363 mN × fineness (dtex), and a tensile speed of 20 mm / min, and the strength and elongation are measured. The test is repeated 10 times under the same conditions, and the average value is defined as the filament elongation.

(Glossy)
A tow filament having a length of 30 cm and a total fineness of 100,000 dtex is evaluated visually under sunlight.
A: Gloss is adjusted to a level equivalent to human hair.
○: Gloss is adjusted moderately.
Δ: Slightly too glossy or slightly too glossy
X: Too much gloss or too little gloss.

(Curl setting)
Wrinkled filaments are placed on a 32mmφ pipe, curled at 120 ° C and 100% relative humidity for 60 minutes under steaming conditions, aged at room temperature for 60 minutes, and then fixed with one end of the curled filaments for fishing. The curl is visually evaluated. This was used as an index of curling ease. It is preferable that the length is short and the shape is curled.
○: Shaped and curled.
Δ: The curl is slightly extended.
X: The curl is extended and the shape is broken.

(Feel)
A sensory evaluation is performed by a professional hairdresser and evaluated in three stages.
○: Very soft texture similar to human hair.
Δ: A slightly harder texture than human hair.
X: A texture harder than human hair.

(Comb street)
A tow filament having a length of 30 cm and a total fineness of 1 million dtex is immersed in a 3% aqueous solution containing a PO / EO random copolymer (molecular weight 20000) and a cationic antistatic agent at a ratio of 50/50 as a fiber surface treatment agent. Each is 0.1% attached and dried at 80 ° C. for 5 minutes. A comb (resin made by Delrin) is passed through the treated tow filament to evaluate the ease of passing the comb.
○: Almost no resistance (light).
Δ: Some resistance (heavy).
X: There is considerable resistance or it gets caught in the middle.

(Iron set property)
It is an index of the ease of curling with a hair iron and the retention of the curled shape. The operation of pulling the filament between the hair iron heated to 180 ° C. and pulling it toward the tip of the filament as it is is repeated three times to preheat the portion of the filament that imparts curl. During this preheating operation, (1) fusion between filaments and (2) filament shrinkage and yarn breakage are visually evaluated.
Next, the preheated filament is beaten against a hair iron, held for 10 seconds, and the iron is pulled out. At this time, (3) ease of removal (rod-out property) and (4) curl retention property when removed are visually evaluated.
○: All of the evaluation items (1) to (4) are satisfactory without problems.
Δ: Slightly bad in any of the evaluation items (1) to (4) described above (slight fusion is observed, there is some shrinkage / thread breakage, the rod-out property is somewhat poor, the curl shape is slightly broken, etc.) .
X: Poor in any of the evaluation items (1) to (4) described above (fusion is recognized, there is shrinkage / thread breakage, the rod-out property is bad, the curled shape is broken, etc.).

Example 1
To 100 parts by weight of polyethylene terephthalate (Nihon Unipet Co., Ltd., RT523), 2 parts by weight of pigment masterbatch (manufactured by Dainichi Seika Kogyo Co., Ltd., PESM22367 BLACK, 20% by weight of carbon black) is added, and the amount of water After dry blending to 100 ppm or less, it is dry blended, supplied to a twin screw extruder (manufactured by Nippon Steel Works, TEX44), melt kneaded at a barrel set temperature of 280 ° C., pelletized, and then the water content is reduced to 100 ppm or less. A polyester resin was obtained by drying.
Next, the polyester-based resin was melted with a melt spinning machine (SV30, manufactured by Shinko Machinery Co., Ltd.) at a barrel set temperature of 290 ° C. using a spinneret having a modified cross-section nozzle hole as shown in Table 1. The undrawn yarn was obtained by discharging, air cooling, and winding at a speed of 130 m / min. The obtained unstretched yarn was stretched at a speed of 30 m / min using a heat roll at 85 ° C. to give a 3-fold stretched yarn, and further continuously heated at 200 ° C., 30 m / min. Winding up at a speed, heat-treating, KWC-Q (manufactured by Maruhishi Oil Chemical Co., Ltd.) 0.20% omf (percentage of pure oil weight to dry fiber weight) and KWC-B (round) Ryoyo Kagaku Kogyo Co., Ltd.) was adhered to 0.10% omf and dried, and then a polyester fiber (multifilament) having a single fiber fineness of 60 to 70 dtex was obtained.
Table 1 shows the results of evaluating the cross-sectional shape and the pitch of unevenness on the outer periphery of the cross-section, the height and the length, the number of protrusions, and the gloss, strong elongation, curl setting properties, tactile sensation, and iron setting properties of the obtained fibers. Shown in

(Examples 2, 4 to 9)
20 parts by weight of brominated epoxy flame retardant (manufactured by Sakamoto Pharmaceutical Co., Ltd., SR-T20000), 100 parts by weight of polyethylene terephthalate (manufactured by Mitsubishi Chemical Corporation, BK-2180), sodium antimonate (Nippon Seiko Co., Ltd.) SA-A, average particle size (primary particle) 2.4 μm) 2 parts by weight, montanic acid wax / fluorine wax blend product (manufactured by Clariant Japan, Wax Composite G431L) 0.2 weight 2 parts by weight of pigment master batch (manufactured by Dainichi Seika Kogyo Co., Ltd., PESM 22367 BLACK, containing 20 wt% carbon black) was obtained in the same manner as in Example 1 to obtain a polyester resin. Polyester fibers were obtained using a spinneret having a modified cross-section nozzle hole shown in FIG.
Table 1 shows the results of evaluating the cross-sectional shape and the pitch of unevenness on the outer periphery of the cross-section, the height and the length, the number of protrusions, and the gloss, strong elongation, curl setting properties, tactile sensation, and iron setting properties of the obtained fibers. Shown in

(Example 3)
In addition to the composition of Example 2, 0.3 parts by weight of fine silica (Fuji Silysia Chemical Co., Ltd., Silicia 310P) was added, and after obtaining a polyester resin by the same method as Example 2, Polyester fibers were obtained using a spinneret having a modified cross-section nozzle hole shown in Table 1.
Table 1 shows the results of evaluating the cross-sectional shape and the pitch of unevenness on the outer periphery of the cross-section, the height and the length, the number of protrusions, and the gloss, strong elongation, curl setting properties, tactile sensation, and iron setting properties of the obtained fibers. Shown in

(Example 10)
The fiber obtained in Example 1 and the fiber obtained in Example 5 were mixed at a filament number ratio of 50/50 and evaluated as a mixed filament.
Table 1 shows the results of evaluating the gloss, strength, curl setting, tactile sensation, and iron setting of the obtained fiber.

(Example 11)
The fiber obtained in Example 2 and the fiber obtained in Example 5 were mixed at a filament number ratio of 50/50 and evaluated as a mixed filament.
Table 1 shows the results of evaluating the gloss, strength, curl setting, tactile sensation, and iron setting of the obtained fiber.

(Example 12)
To 100 parts by weight of nylon 66 (made by Ube Industries, Ltd., 2020U), 2 parts by weight of a pigment masterbatch (produced by Dainichi Seika Kogyo Co., Ltd., PESM22367 BLACK, containing 20 wt% carbon black) is added, and the water content is 100 ppm. After being dried below, dry blended, supplied to a twin screw extruder (manufactured by Nippon Steel Works, TEX44), melt kneaded at a barrel set temperature of 280 ° C., pelletized, and dried to a moisture content of 100 ppm or less. Thus, a polyamide resin was obtained.
Next, the polyamide-based resin is melted by using a spinneret having a modified cross-section nozzle hole shown in Table 1 at a barrel set temperature of 280 ° C. using a melt spinning machine (SV30, manufactured by Shinko Machinery Co., Ltd.). The undrawn yarn was obtained by discharging, air cooling, and winding at a speed of 130 m / min. The obtained unstretched yarn was stretched at a speed of 30 m / min using a heat roll at 80 ° C. to give a triple-stretched yarn, and further, continuously heated at 180 ° C., 30 m / min. Winding up at a speed, heat-treating, KWC-Q (manufactured by Maruhishi Oil Chemical Co., Ltd.) 0.20% omf (percentage of pure oil weight to dry fiber weight) and KWC-B (round) Ryo Oil Chemical Co., Ltd.) was attached to 0.10% omf and dried, and then a polyamide fiber (multifilament) having a single fiber fineness of 60 to 70 dtex was obtained.
Table 1 shows the results of evaluating the cross-sectional shape and the pitch of unevenness on the outer periphery of the cross-section, the height and the length, the number of protrusions, and the gloss, strong elongation, curl setting properties, tactile sensation, and iron setting properties of the obtained fibers. Shown in

(Example 13)
3 parts by weight of EEA resin (manufactured by Nippon Unicar Co., Ltd., PES-250), acrylic processing aid (manufactured by Kaneka Corporation, Kane Ace PA20) with respect to 100 parts by weight of vinyl chloride resin (manufactured by Kaneka Corporation, S1001) ) 1.3 parts by weight, 0.5 parts by weight of octyl tin mercapto heat stabilizer (manufactured by Sankyo Co., Ltd.), 0.5 parts by weight of butyl tin maleate heat stabilizer (manufactured by Sansha Co., Ltd.) , 0.6 parts by weight of calcium stearate, 0.5 parts by weight of polyethylene wax, 0.5 parts by weight of stearic acid and 0.8 parts by weight of lauryl alcohol are added to a Henschel mixer and the temperature of the contents is stirred. The mixture was stirred and mixed until the temperature reached 115 ° C. Thereafter, the content was cooled to 75 ° C. to obtain a vinyl chloride powder compound.
Next, the molten polymer is discharged from the powder compound using a spinneret having a modified cross-section nozzle hole shown in Table 1 at a barrel set temperature of 180 ° C. using a melt spinning machine (SV30, manufactured by Shinko Machinery Co., Ltd.). Then, it was heated by passing through a heated spinning tube at 320 ° C. and wound at a speed of 60 m / min to obtain an undrawn yarn. The obtained undrawn yarn was drawn at a speed of 15 m / min using a heating box at 95 ° C. to obtain a 3.5-fold drawn yarn, and further subjected to heat treatment using a heating box at 105 ° C. A vinyl chloride fiber (multifilament) having a fiber fineness of 60 to 70 dtex was obtained.
Table 1 shows the results of evaluating the cross-sectional shape and the pitch of unevenness in the cross-section, the height, the number of protrusions, the number of protrusions, gloss, strength, curl setting, tactile sensation, and iron setting of the obtained fiber. Show.

(Comparative Examples 1-8)
20 parts by weight of brominated epoxy flame retardant (manufactured by Sakamoto Pharmaceutical Co., Ltd., SR-T20000), 100 parts by weight of polyethylene terephthalate (manufactured by Mitsubishi Chemical Corporation, BK-2180), sodium antimonate (Nippon Seiko Co., Ltd.) SA-A, average particle size (primary particle) 2.4 μm) 2 parts by weight, montanic acid wax / fluorine wax blend product (manufactured by Clariant Japan, Wax Composite G431L) 0.2 weight 2 parts by weight of pigment master batch (manufactured by Dainichi Seika Kogyo Co., Ltd., PESM22367 BLACK, containing 20 wt% of carbon black) was obtained in the same manner as in Example 1 to obtain a polyester resin. A single-fiber fineness of 60 to 70 dtex using a spinneret having a circular or irregular cross-section nozzle hole shown in FIG. To give the ester-based fiber (multi-filament).
Table 2 shows the results of evaluating the cross-sectional shape and the pitch of unevenness on the outer periphery of the cross-section, the height of the cross-section, the number of protrusions, gloss, strong elongation, curl setting property, tactile sensation, and iron setting property of the obtained fiber. Shown in

  As shown in Tables 1 and 2, it was confirmed that in Examples, the spinning property, stretchability, and heat treatment property were stable and excellent in gloss, curl setting property, and tactile sensation compared to the comparative example.

  Therefore, the artificial hair fiber produced by the production method of the present invention has a natural luster and tactile sensation closer to human hair and good fiber properties that have not been obtained with conventional fiber cross sections. An artificial hair fiber that maintains and has excellent curling properties can be obtained.

Cross section of irregular cross section fiber 1 Modified cross section fiber 2 cross section Cross section of irregular cross section fiber 3 Cross section of irregular cross section fiber 4 Cross section of irregular cross section fiber 5 Atypical cross section fiber 6 cross section Cross section of irregular cross section fiber 7 Cross section of irregular cross section fiber 8 Cross section of irregular cross section fiber 9 Circular cross-sectional view of fiber 10 Cross section of irregular cross-section fiber 11 Cross section of irregular cross section fiber 12 Modified cross-section fiber 13 cross section Cross section of irregular cross-section fiber 14 Profile cross section of fiber 15 Cross section of irregular cross-section fiber 16

Explanation of symbols

1 Basic shape 2 Pitch 3 Height

Claims (16)

  A fiber for artificial hair having a single fiber fineness of 10 to 100 dtex, having continuous irregularities with a pitch of 5 to 20 μm on the outer periphery of the cross section.   2. The artificial hair fiber according to claim 1, wherein the height of the concave and convex portions on the outer periphery is 2.5 to 10 [mu] m.   In the continuous unevenness | corrugation on the said outer periphery, the total number of a convex part is 8-40, and the unevenness | corrugation is formed continuously for 2 periods or more, The fiber for artificial hair of Claim 1 or 2 characterized by the above-mentioned.   The artificial hair fiber according to any one of claims 1 to 3, wherein the irregularities on the outer periphery are made of arbitrary straight lines, arcs, curves, or combinations thereof.   5. The artificial hair fiber according to claim 4, wherein the irregularities on the outer periphery are formed by a continuous arc, and the arc is ejected from a nozzle having a radius of 100 [mu] m or less.   The basic shape of the cross-section of the artificial hair fiber has at least one shape selected from the group consisting of a circle, an ellipse, a cross circle, a saddle shape, a daruma shape, a dog bone shape, and a ribbon shape. The fiber for artificial hair according to any one of claims 1 to 5.   The artificial hair according to any one of claims 1 to 6, wherein the artificial hair fiber is one selected from the group consisting of vinyl chloride fiber, polyamide fiber and polyester fiber. fiber.   77. The artificial hair fiber according to any one of claims 1 to 76, wherein the artificial hair fiber is a polyester fiber.   The polyester-based fiber is 5 to 30 parts by weight of a bromine-containing flame retardant (B), 100 parts by weight of a polyester (A) composed of at least one of polyalkylene terephthalate and a copolymerized polyester mainly composed of polyalkylene terephthalate, antimony It is a flame retardant polyester fiber formed from a composition comprising 0.5 to 10 parts by weight of a compound (C) and 0.05 to 3 parts by weight of a plasticizer and / or a lubricant (D). The artificial hair fiber according to claim 8.   The artificial hair fiber according to claim 9, wherein the polyalkylene terephthalate is at least one polymer selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate.   The bromine-containing flame retardant (B) is brominated aromatic flame retardant, bromine-containing phosphate ester flame retardant, brominated polystyrene flame retardant, brominated benzyl acrylate flame retardant, brominated epoxy flame retardant, bromine 99. At least one flame retardant selected from the group consisting of a brominated phenoxy-based flame retardant, a brominated polycarbonate-based flame retardant, a tetrabromobisphenol A derivative, a bromine-containing triazine-based compound, and a bromine-containing isocyanuric acid-based compound. Or the fiber for artificial hair in any one of 10.   The antimony compound (C) is at least one antimony compound selected from the group consisting of antimony trioxide, antimony tetroxide, antimony pentoxide and sodium antimonate, according to any one of claims 9 to 11. Fiber for artificial hair.   The dispersant (D) is a montanic acid wax, a montanic acid ester wax, a partially saponified montanic acid wax, a montanic acid metal salt, a polyethylene wax, a polyethylene oxide wax, polytetrafluoroethylene, a fluorine-modified wax, poly The fiber for artificial hair according to any one of claims 9 to 12, which is a compound comprising at least one of dimethyl silicone and modified silicone resin.   The artificial hair according to any one of claims 9 to 13, further comprising 0.1 to 5 parts by weight of organic fine particles (E) and / or inorganic fine particles (F) with respect to 100 parts by weight of polyester (A). fiber.   The artificial hair fiber according to claim 14, wherein the organic fine particles (E) are at least one selected from the group consisting of polyarylate, polyamide, fluororesin, silicone resin, crosslinked acrylic resin and crosslinked polystyrene.   The inorganic fine particles (F) are at least one selected from the group consisting of calcium carbonate, silicon oxide, silica / melamine resin composite, titanium oxide, aluminum oxide, zinc oxide, talc, kaolin, montmorillonite, bentonite and mica. The fiber for artificial hair according to claim 14.