JP2007126787A - Fiber for artificial hair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide very excellent and well balanced fiber for artificial hair having natural luster and touch feeling similar to those of human hair, excellent in combing property, curling property and also fabric property such as strength and elongation, and favorably preventing the artificial hair after processed for sale from falling off. <P>SOLUTION: The fiber for artificial hair has 10-100 dtex monofilament fineness. A modified cross-sectional surface having an additional shape at the outer peripheral part of a circular base shape having a diameter D, or an elliptic reference shape having a long diameter Da and a short diameter Db and satisfying the following equation: D=(Da+Db)/2, has a distance L from a point on the outer periphery of the reference shape to a remotest point on the outer periphery of the additional shape satisfying the following equation: L≤0.414D. <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 and a fiber for artificial hair using 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.

It is well known that the ultimate goal of artificial hair fibers is human hair, but the cross-section of human hair is almost circular or oval, with the most natural appearance, feel and texture, and relatively good It is considered that these cross sections are the basis for imparting fiber properties.
These cross sections are excellent in terms of cosmetic properties required for artificial hair fibers such as appearance, touch, stiffness and firmness, and are excellent in curling and curl retention when post-processing curls. I know that. These curl characteristics depend on the cross-sectional second moment of the fiber, and the larger this is, the better the curl characteristics are.

  However, in the synthetic fiber, the uniformity of the fiber is damaged, and the appearance and feel that are unlikely to be human hair become remarkable. That is, in a cross section having a high degree of solidity such as a circular shape or an elliptical shape, the convergence property when the hair bundle is made is relatively strong, and it tends to be a dense hair bundle. For this reason, the comb street is very heavy and has a strong feeling. Also, the feeling in the hand tends to be heavy and hard. For this reason, as an oil agent that can suitably improve the slipperiness, a product to which an oil agent having a friction reducing effect typified by a silicone-based oil agent is mainly used, and combing has been greatly improved. However, in the post-processing step of products made of fibers having a circular or elliptical cross section, when making eyelashes or planting hair on a net, cloth, or skin-like base like a wig, There is a fatal defect as a fiber for artificial hair that the fiber fixed once is easily pulled out by pulling or the like due to the solidity and by the influence of the friction reducing oil.

Therefore, flatness, glasses shape, dogbone shape, etc. to express moderate volume (bulkyness) and softness while increasing the fineness to give a sense of volume and not too much rigidity. Have been devised and used for artificial hair.
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. The contact has a cross-sectional shape in which at least two flat circles are partially overlapped with each other, and the length of the short axis of the wig and the blade filament connected with a width substantially equal to the radius of the unit filament (Patent Document 2). The ratio L / W between 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 wigs Like Lament (Patent Document 3).

However, these deformed cross-sectional shapes generally have smaller secondary moments of cross-section than circular and elliptical shapes, but softness is obtained, but the stiffness and curl characteristics deteriorate, and it is still excellent as a fiber for artificial hair. The level of having balance was not reached. In this way, while maintaining the advantages of the circular or elliptical cross section, the artificial hair that can suitably improve the above-mentioned combing problem and the problem of hair loss at the same time and provide a very well-balanced product. Never before.
Japanese Utility Model Publication No. 48-13277 Japanese Utility Model Publication No. 63-78026 Japanese Patent Laid-Open No. 55-51802

  The present invention has a natural luster and feel similar to human hair, has excellent combing and curling properties, excellent fiber properties such as high elongation, and suitably prevents hair loss of processed products. An object of the present invention is to provide a very well-balanced artificial hair fiber.

  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 relates to an artificial hair fiber having a single fiber fineness of 10 to 100 dtex, and a basic shape consisting of a circle having a diameter D or a long diameter Da and a single fiber fineness of 10 to 100 dtex. On the outer periphery of the reference shape consisting of an ellipse having a minor axis Db and D = (Da + Db) / 2, preferably on the outer periphery of the reference shape in an irregular cross section having 1 to 3 accompanying shapes The present invention relates to an artificial hair fiber in which the distance L from the point to the most distal point on the outer periphery of the associated shape is in the range of L ≦ 0.414D. Preferably, the accompanying shape is a circle having a diameter d or an ellipse having a major axis da and a minor axis db, and d = (da + db) / 2, and 0.155D <d ≦ 0. Further, the present invention relates to an artificial hair fiber in which the distance W of the portion where the accompanying shape overlaps the reference shape is in the range of 0.1d ≦ W ≦ 0.4d. The present invention also relates to a fiber for artificial hair which contains at least 14% of a modified cross-section fiber having an accompanying shape attached to the outer peripheral portion of the reference shape, and is mixed with other cross-section fibers.

  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, a plasticizer and / or a lubricant (E) 0.05 to 3 parts by weight, preferably polyester ( A) 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) is a brominated aromatic flame retardant, bromine-containing phosphate ester Flame retardant, brominated polystyrene flame retardant, brominated benzyl acrylate Selected from the group consisting of a flame retardant, a brominated 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 antimony compound (C) is at least one antimony compound selected from the group consisting of antimony trioxide, antimony tetroxide, antimony pentoxide, and sodium antimonate, and a dispersing agent ( E) 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, a polytetrafluoroethylene, a fluorine-modified wax, a polydimethylsilicone, Modified silicone cash register Is a compound consisting of one or more, it relates to a fiber for artificial hair.

  Furthermore, the above-mentioned polyester-based artificial hair fibers containing 0.1 to 5 parts by weight of organic fine particles (F) and / or inorganic fine particles (G) with respect to 100 parts by weight of polyester (A), more preferably organic fine particles ( F) 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 (G) 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, the natural gloss and feel close to human hair, which has not been obtained with conventional fiber cross-sections, maintain good fiber properties, maintain good fiber properties, have excellent curling characteristics, and are processed products. Thus, a fiber for artificial hair in which hair loss is suitably prevented 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, it is generally suitable for artificial hair that the single fiber fineness is usually 10 to 100 dtex, and further 20 to 90 dtex.

  As shown in FIG. 1, the artificial hair fiber of the present invention has a basic shape consisting of a circle having a diameter D, or a standard consisting of an ellipse having a major axis Da and a minor axis Db, and D = (Da + Db) / 2. It is a fiber having an irregular cross section having an accompanying shape on the outer periphery of the shape. In order to obtain a more natural appearance, feel and texture as a fiber for artificial hair and relatively excellent fiber physical properties, the reference shape is preferably a circle or an ellipse. Here, the reference shape means a cross-sectional shape that forms the basis of the cross section of the fiber for artificial hair in the present invention. The accompanying shape is a sectional shape associated with the reference shape that is joined to the reference shape in the cross section of the fiber and is joined to the extent that it is not separated or detached from the reference shape in the normal processing / use form. It means that there is.

  The accompanying shape may be formed from a combination of a circle, an ellipse, a rectangle, and any other straight line or curve. However, in consideration of the appearance, feel, etc. as an artificial hair fiber, it should be formed from a circle or an ellipse. Is preferred.

  The accompanying shape is preferably a circle having a diameter d or an ellipse having a major axis da and a minor axis db, and d = (da + db) / 2.

  As described above, the incidental shape must be joined to the reference shape in the cross section of the fiber and joined to the extent that it is not separated or detached from the reference shape in a normal processing / use form. In order to ensure, it is preferable that the distance W of the portion where the accompanying shape overlaps the reference shape is in the range of 0.1d ≦ W ≦ 0.4d. If the distance W is less than 0.1d, there is a possibility that the bonding to the reference shape may be incomplete, and if it exceeds 0.4d, the portion of the accompanying shape occupying the outer periphery of the reference shape becomes too large, and the desired effect is obtained. It becomes difficult to obtain. The associated shape is joined in the vicinity of the outer periphery of the reference shape, and the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape is in the range of L ≦ 0.414D. It is preferable.

  The accompanying shape is a circle having a diameter d or an ellipse having a major axis da and a minor axis db, d = (da + db) / 2, and 0.155D <d ≦ 0.690D. preferable. When the accompanying shape is in the above range, the convergence property when the hair bundle is made is relaxed while maintaining the preferable characteristics as a fiber for artificial hair, which the circular or elliptical reference cross section has, and the solid feeling and combing are reduced. Can be preferably improved. Further, it is possible to prevent hair loss when producing eyelashes or when planting hair on a net, cloth, or skin-like base like a wig.

  The range of the diameter d of the incidental shape and the range of the distance L are derived from the geometric logic when a circular cross section is used for both the reference shape and the incidental shape. That is, when considering the cross-section of the fibers forming the fiber bundle, the plane-filled type includes a regular triangular lattice, a square lattice, and the like. Here, when considering an arrangement in which the circles do not overlap with each other on the plane, or an arrangement that completely covers the plane, as shown in FIG. When placed at the vertices of a triangle, that is, when each circle is a regular hexagonal vertex and is adjacent to six other circles. For this reason, the lower limit of d is the diameter of a circle that can be placed in the gap formed during the close-packed filling of the circle, and has the diameter of the incidental shape that protrudes more than this distance from the outer periphery of the reference shape. If this is the case, close-packing can be prevented. The diameter of the circle that can be arranged in the space at the time of the close-packing can be calculated as 2/3 · (√3-1) · D = 0.155D. Therefore, d> 0.155D.

  In addition, as shown in FIG. 3, the upper limit value of the L is arranged in the gap formed at the least dense filling, assuming that the center of the circle is placed at the apex of the square in consideration of the square lattice. If the diameter of a circle that can be obtained is obtained and has at least an accompanying shape of this distance, a sparse packing density is obtained. The diameter of the circle that can be arranged in the gap at the time of the least-filled filling can be obtained as (√2-1) · D = 0.414D by calculation in the same manner as described above. Therefore, L ≦ 0.414D.

  When L exceeds 0.414D, close-packing can be effectively prevented, while the cross-sectional secondary moment in the fiber cross-sectional shape is reduced, and softness is obtained, but there is a tendency for stiffness and curl characteristics to deteriorate. is there.

  On the other hand, when the distance W of the portion where the accompanying shape overlaps the reference shape is the upper limit value of 0.4d, the upper limit value of d is the distance of the portion protruding from the outer periphery of the reference shape (d-0. 4d) = 0.6d. At this time, since it is equal to the upper limit value 0.414D of L, 0.6d ≦ 0.414D and d ≦ 0.69D.

  The above is a calculation result derived in consideration of the case where the reference shape is a circle. Similarly, when the case where the reference shape is an ellipse is considered, the average value of the major axis Da and the minor axis Db of the ellipse. The above range may be applied with D = (Da + Db) / 2.

It is preferable that the said incidental shape is 1-3. Although it is possible to prevent the above-mentioned close-packing even with one accompanying shape, it is preferable to arrange two or three in order to reduce the filling efficiency more efficiently and reliably. When four or more associated shapes are formed, the friction between the fibers increases and the tactile sensation and combing tend to deteriorate.
When the number of the accompanying shapes is two or three, the arrangement with respect to the reference shape is not particularly limited in the fiber cross section. In the case of 2 pieces, they may be arranged farthest from each other, that is, in an arrangement of 180 °, and in the case of 3 pieces, it may be arranged at 120 °. Arbitrary arrangements are taken in consideration of the spinning cooling balance and the moment of the finished fiber. Design and manufacture. The fibers having different arrangement angles of the accompanying shapes may be mixed, or the artificial hair fibers of the present invention having different numbers of accompanying shapes may be mixed and used in an arbitrary ratio.

  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.

  The natural cross-section fiber of the present invention is mixed with other different cross-sections such as circular, elliptical, cross-circular, saddle-shaped, dogbone-shaped, ribbon-shaped, etc. It is possible to construct an artificial hair fiber having appearance and touch. At that time, by containing at least 14% or more of the irregular cross-section fiber of the present invention in the number of single fibers, the convergence when the hair bundle is made can be relaxed, and the feeling of heavyness and combing can be suitably improved. Contributes to preventing hair loss when processed. 14% is the cross-section when close packed, and assuming that each circle is apex of a regular hexagon and is adjacent to six other circles, at least one of the irregular cross-section yarns of the present invention The ratio in the case of consisting of is shown. If it is less than 14%, it is difficult to obtain the desired effect even if the irregular cross-section fibers of the present invention are mixed. In order to effectively prevent the above-mentioned close-packing, the proportion of the modified cross-section fibers of the present invention is preferably 2 or 3, that is, 29% or more, more preferably 43% or more. .

  Examples of the fiber material used in the present invention include commonly 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. Fiber obtained by melt spinning a composition comprising polyester (A) comprising at least one copolymerized polyester mainly composed of terephthalate, bromine-containing flame retardant (B), antimony compound (C) and dispersant (E) More preferably, 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. In addition, the said main body 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 (E), 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 filament with good combing properties can be obtained.

  As the dispersant (E) 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. Examples of the dispersant (E) used in the present invention include 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 from the viewpoint that the antimony compound has little influence on fiber properties such as dispersibility, flame retardancy, and heat resistance. These compounds may be used alone or in combination of two or more.

  The amount of the dispersant (E) 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 (E) used is less than 0.05 parts by weight, the antimony compound particles (C) are partially aggregated, and yarn breakage during spinning processing tends to occur, or the fiber surface tends to feel soft. 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 organic fine particles (F) and / or inorganic fine particles (G), Gloss and gloss can be adjusted.

  As the organic fine particles (F) in the present invention, any organic resin having a structure that is incompatible with or partially incompatible with the flame retardant polyester (A) as the main component can be used. 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 (G) 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 (G) 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 (F) and / or inorganic fine particles (G) 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 (F) and / or inorganic fine particles (G) is smaller than 0.1 μm, the gloss adjustment effect tends to be small, and when larger than 15 μm, the gloss adjustment effect is small. Or yarn breakage tends to occur.

  The amount of the organic fine particles (F) and / or inorganic fine particles (G) used in the present invention is not particularly limited, but is 0.1 to 5 weights in total with respect to 100 parts by weight 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. If the amount of the organic fine particles (F) and / or inorganic fine particles (G) 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 (E), and organic fine particles (F) or inorganic fine particles. After dry blending (G), 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) and dispersant (E), and organic fine particles (F) or inorganic fine particles (G), Using a twin screw extruder equipped with a spinning nozzle or a single screw extruder using a screw having kneading ability, it can be obtained by melt spinning without taking out the resin composition once.

  Further, after the polyester (A), the antimony compound (C), the dispersant (E), and the organic fine particles (F) or the inorganic fine particles (G) are melt-kneaded, melt-spun and fiberized, bromine-containing difficulty The polyester-based artificial hair fiber of the present invention can be obtained by exhausting the 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.

  The characteristic value measurement method is as follows.

(Cross sectional shape)
Measured with a laser microscope VK-9500 manufactured by Keyence. A cross section of the fiber is magnified and observed at a magnification of 3000 × (objective lens 150 ×× built-in lens 20 ×), and the reference image has a diameter D, an accompanying shape diameter d, and a point on the outer periphery of the reference shape on the obtained image. The distance L to the most distal point on the outer periphery of the shape and the distance W of the overlapping portion of the associated shape and the reference shape are measured. Further, L and W are represented by D and d, respectively, based on the measurement result.

(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 comb (Dellin resin) is passed through a tow filament having a length of 30 cm and a total fineness of 1 million dtex, and the ease of combing is evaluated.
A: Almost no resistance (light)
○: Slight resistance △: Slight 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) (slightly fused, slightly crimped or broken, rod-out property is somewhat poor, 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.).

(Hair loss)
Wrinkled filaments are placed on a 32mmφ pipe, curled under steaming conditions at 120 ° C and 100% relative humidity for 60 minutes, and after aging for 60 minutes at room temperature, one end of the curled filament is fixed and fishing Lower and pass through comb (resin made by Delrin) and evaluate the difficulty of hair removal.
○: Almost no hair loss Δ: Some hair loss ×: There is considerable hair loss

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) Ryo Oil Chemical Co., Ltd.) was dried so as to be 0.10% omf, and then a polyester fiber (multifilament) having a single fiber fineness of 60 to 70 dtex was obtained.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the transverse section, the diameter d of the reference shape, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, Table 1 shows the results of the evaluation of the distance W of overlapping portions with respect to the reference shape, single fiber fineness, gloss, strong elongation, curl setting, tactile sensation, iron setting, and hair loss.

(Example 2)
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) Ryoyo Kagaku Kogyo Co., Ltd.) was dried to 0.10% omf, and a polyamide fiber (multifilament) having a single fiber fineness of 60 to 70 dtex was obtained.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the cross-section, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, and the associated shape overlap with the reference shape Table 1 shows the results of evaluating the distance W of the portion, the single fiber fineness, gloss, high elongation, curl setting, touch, iron setting, and hair loss.

(Example 3)
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.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the transverse section, the diameter d of the reference shape, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, Table 1 shows the results of the evaluation of the distance W of overlapping portions with respect to the reference shape, single fiber fineness, gloss, strong elongation, curl setting, tactile sensation, iron setting, and hair loss.

(Examples 4 to 10)
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.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the transverse section, the diameter d of the reference shape, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, Table 1 shows the results of the evaluation of the distance W of overlapping portions with respect to the reference shape, single fiber fineness, gloss, strong elongation, curl setting, tactile sensation, iron setting, and hair loss.

(Examples 11 and 12)
In addition to the composition of Example 4, 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 in Example 4, Polyester fibers were obtained using a spinneret having a modified cross-section nozzle hole shown in Table 1.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the cross-section, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, and the associated shape overlap with the reference shape Table 1 shows the results of evaluating the distance W of the portion, the single fiber fineness, gloss, high elongation, curl setting, touch, iron setting, and hair loss.

(Example 13)
The fiber obtained in Example 1 and the fiber obtained in Example 4 were mixed at a filament number ratio of 50/50 and evaluated as a mixed filament.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the cross-section, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, and the associated shape overlap with the reference shape Table 1 shows the results of evaluation of the distance W of the part, the single fiber fineness, gloss, high elongation, curl setting, tactile sensation, iron setting, and hair loss.

(Example 14)
The fiber obtained in Example 5 and the fiber obtained in Comparative Example 1 were mixed at a filament number ratio of 50/50 and evaluated as a mixed filament.
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the cross-section, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, and the associated shape overlap with the reference shape Table 1 shows the results of evaluation of the distance W of the part, the single fiber fineness, gloss, high elongation, curl setting, tactile sensation, iron setting, and hair loss.

(Comparative Examples 1-5)
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).
For the obtained fiber, the cross-sectional shape and the number of associated shapes in the transverse section, the diameter d of the reference shape, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape, Table 2 shows the results of evaluating the distance W of overlapping portions with respect to the reference shape, single fiber fineness, gloss, strong elongation, curl setting, tactile sensation, iron setting, and hair loss.

  As shown in Tables 1 and 2, it was confirmed that in the examples, the spinning property, stretchability, and heat treatment property were stable with respect to the comparative example, and in particular, the curl setting property, hair removal, and combing were excellent. It was.

  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. It is possible to obtain a fiber for artificial hair that is maintained, excellent in curling characteristics, and in which hair loss of the processed product is suitably prevented.

Cross-sectional shape dimensions explanatory drawing Illustration of minimum void in fiber cross-sectional arrangement Explanatory drawing of the maximum gap in the fiber cross-sectional arrangement 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 Cross section of irregular cross section fiber 6 Cross section of irregular cross section fiber 7 Cross section of irregular cross section fiber 8 Cross section of irregular cross section fiber 9 Cross section of irregular cross-section fiber 10 Cross section of irregular cross-section fiber 11 Circular cross section of fiber 12 Oval 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 Cross section of irregular cross-section fiber 17

Explanation of symbols

1 Reference section 2 Attached section 3 Reference section diameter D
4 Associated sectional diameter d
5 Distance L
6 Distance W
7 Section diameter D
8 Cross-sectional diameter 0.155D arranged in the gap
9 Section diameter D
10 Cross-sectional diameter 0.414D arranged in the gap

Claims (15)

  A fiber for artificial hair having a single fiber fineness of 10 to 100 dtex, a basic shape consisting of a circle having a diameter D, or a standard consisting of an ellipse having a major axis Da and a minor axis Db, and D = (Da + Db) / 2 In a deformed cross section having an associated shape at the outer periphery of the shape, the distance L from the point on the outer periphery of the reference shape to the most distal point on the outer periphery of the associated shape is in the range of L ≦ 0.414D An artificial hair fiber characterized by the above.   The accompanying shape is a circle having a diameter d or an ellipse having a major axis da and a minor axis db, d = (da + db) / 2, and 0.155D <d ≦ 0.690D. The artificial hair fiber according to claim 1, wherein the fiber is artificial hair.   The fiber for artificial hair according to claim 2, wherein a distance W of a portion where the accompanying shape overlaps with a reference shape is in a range of 0.1d≤W≤0.4d.   The artificial hair fiber according to any one of claims 1 to 3, wherein the number of accompanying shapes attached to the outer peripheral portion of the reference shape is 1 to 3.   The odd-shaped cross-section fiber having an accompanying shape attached to the outer peripheral portion of the reference shape is contained at least 14% in the number of single fibers, and is mixed with fibers having other different cross-sections. The fiber for artificial hair in any one of 1-4.   The artificial hair according to any one of claims 1 to 5, wherein the artificial hair fiber is made of one selected from the group consisting of vinyl chloride fiber, polyamide fiber and polyester fiber. fiber.   The artificial hair fiber according to any one of claims 1 to 6, 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 dispersant (E). 7. The artificial hair fiber according to 7.   The artificial hair fiber according to claim 8, 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 9. A flame retardant that is at least one 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 9.   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 8 to 10. Fiber for artificial hair.   Dispersant (E) is a montanic acid wax, montanic acid ester wax, partially saponified montanic acid wax, montanic acid metal salt, polyethylene wax, oxidized polyethylene wax, polytetrafluoroethylene, fluorine-modified wax, poly The fiber for artificial hair according to any one of claims 8 to 11, which is a compound comprising at least one of dimethyl silicone and modified silicone resin.   The artificial hair according to any one of claims 8 to 12, further comprising 0.1 to 5 parts by weight of organic fine particles (F) and / or inorganic fine particles (G) with respect to 100 parts by weight of polyester (A). fiber.   The artificial hair fiber according to claim 13, wherein the organic fine particles (F) 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 (G) 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 13.

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