US20140109924A1 - Artificial hair fiber and hairpiece product - Google Patents

Artificial hair fiber and hairpiece product Download PDF

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US20140109924A1
US20140109924A1 US14/114,539 US201214114539A US2014109924A1 US 20140109924 A1 US20140109924 A1 US 20140109924A1 US 201214114539 A US201214114539 A US 201214114539A US 2014109924 A1 US2014109924 A1 US 2014109924A1
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Prior art keywords
artificial hair
hair fiber
fiber
elastic modulus
storage elastic
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US14/114,539
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Atsushi Horihata
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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Assigned to DENKI KAGAKU KOGYO KABUSHIKI KAISHA reassignment DENKI KAGAKU KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HORIHATA, ATSUSHI
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    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
    • A41G3/00—Wigs
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
    • A41G3/00—Wigs
    • A41G3/0083—Filaments for making wigs
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters

Definitions

  • the present invention relates to artificial hair fiber and a hairpiece product using the same.
  • the present invention provides artificial hair fiber and a product manufactured by using the artificial hair fiber.
  • the artificial hair fiber according to the present invention has a storage elastic modulus E′, a ratio (E′ 90 /E′ 150 ) of a storage elastic modulus E′ at a temperature of 90° C. to a storage elastic modulus E′ at a temperature of 150° C. is 3 to 20.
  • a curve of the storage elastic modulus E′ includes a glass state range in which the storage elastic modulus E′ is constant and a transition range in which a change rate in the storage elastic modulus E′ becomes maximum, the transition range being on a higher temperature side than the glass state range.
  • a temperature coordinate of an intersection at which a tangent line of a curve of the storage elastic modulus E′ passing through the glass state range intersects a tangent line of a curve of the storage elastic modulus E′ passing through the transition range is located between 180 to 240° C.
  • the artificial hair fiber is made of a resin composition primarily consisting of one or both of thermoplastic polyester resin and thermoplastic polyamide resin.
  • the artificial hair fiber is manufactured by melting and discharging the resin composition from a nozzle hole to produce an un-stretched yarn, and applying a stretching process to the un-stretched yarn.
  • a ratio (D 1 /D 2 ) of a stretch D 1 while the un-stretched yarn is produced after the resin composition is melted and discharged to a stretch D 2 during the stretching process is 1.5 to 14.0.
  • FIG. 1 is a graph showing the relationship between storage elastic modulus and temperature
  • FIG. 2 is a graph showing the viscoelasticity of artificial hair fiber according to examples.
  • FIG. 3 is a graph showing the viscoelasticity of artificial hair fiber according to comparative examples.
  • the present invention provides artificial hair fiber that can be well curled (set, or styled).
  • the artificial hair fiber should not be limited to those described above, but may be, for example, synthetic fiber obtained by spinning resin composition, or fiber obtained by applying a processing agent to the synthetic fiber.
  • Formation and processing the artificial hair fiber may be done by an artificial hair fiber manufacturer, a person who processes the fiber into a hairpiece product and a user who bought the product.
  • a manufacturer of artificial hair fiber or hairpiece product may form and process the artificial hair fiber to have it curled before the artificial hair fiber is put on sale.
  • the formation and processing may be done any time, before, during or after the processing of the artificial hair fiber into a hairpiece product.
  • the formation and processing are not limited to curling (waving), but straightening the curled hair may also be applicable.
  • Methods of forming the artificial hair fiber should not be limited. There are various methods, for example, a method of placing a heating device such as a hair iron in contact with the artificial hair fiber or pressing the artificial hair fiber with the hair iron; a method of exposing the artificial hair fiber wound around a core (metal cylinder) to heated air; and a method of heating the core around which the artificial hair fiber is wound. In general, it is usual to use a method of placing a core wound by the artificial hair fiber in a heating oven and heating the core.
  • a heating device such as a hair iron in contact with the artificial hair fiber or pressing the artificial hair fiber with the hair iron
  • a method of exposing the artificial hair fiber wound around a core metal cylinder
  • a method of heating the core around which the artificial hair fiber is wound In general, it is usual to use a method of placing a core wound by the artificial hair fiber in a heating oven and heating the core.
  • a heating temperature (formation temperature) in the formation process should not be specifically limited. Although the heating temperature can be changed depending upon the raw materials of the artificial hair fiber, the formation temperature may be in a range from 90 to 150° C. in general.
  • FIG. 1 is a schematic diagram explaining the viscoelasticity of the artificial hair fiber.
  • Both storage elastic modulus E′ and loss elastic modulus E′′ of synthetic fiber will drop upon being heated.
  • Curve “c” in FIG. 1 shows a change in the elastic moduli (E′, E′′) of heat-resistant artificial hair that is commercially available.
  • the change rate in the elastic moduli (E′, E′′) of the heat-resistant artificial hair is small within the formation temperature range due to its heat resistance, so that a formation such as curling is not acceptable.
  • curves “a” and “b” in FIG. 1 when the change rate in the elastic moduli (E′, E′′) is large within the formation temperature range, the artificial hair can be easily transformed, thereby obtaining an acceptable formability.
  • a hairpiece product may be processed by the user to satisfy the his or her taste (hereinafter referred to as “post-formation”).
  • Commercially available heating devices e.g. a hair iron
  • the heating temperatures of those heating devices are within a wide range from 60 to 240° C.
  • the temperature of the post-formation tends to be higher (180 to 240° C.) than the formation temperature before the product is sold in the market, since users prefer to set the hairpiece product well in a short time.
  • the fiber does not melt before the temperature reaches the post-formation temperature range and the rate of change is large in the formation temperature range and also in the post-formation temperature range.
  • the elastic moduli (E′, E′′) significantly changes during the melting.
  • “a” and “c” in FIG. 1 melt in the post-formation temperature range, but “b” melts before the post-formation temperature range.
  • the artificial hair fiber is not heated at a high temperature above the post-formation temperature range. Therefore, if the rate of change is large in the post-formation temperature range, the fiber is allowed to melt in the post-formation temperature range, as shown by “a” and “c”.
  • the formation temperature that is widely adopted in the artificial hair field is within 90 to 150° C., while the post-formation temperature that the users prefer is within 180 to 240° C. Therefore, it is preferable that the elastic moduli significantly change in both these ranges.
  • E′ 90 /E′ 150 be 3 to 20, and more preferably 4 to 10. If E′ 90 /E′ 150 is lower than 3, a change in the elastic moduli will be small in the formation temperature range (90 to 150° C.), and therefore it is difficult to curl the fiber well. On the other hand, if E′ 90 /E′ 150 is higher than 20, the fiber shrinks and therefore it is also difficult to curl the fiber well. If E′ 90 /E′ 150 is 4 to 10, it is possible to curl the fiber very well without shrinking, and therefore this temperature range is particularly preferable.
  • the fiber taking into account the post-formation (curling with an iron), it is preferable for the fiber to have a high heat resistance.
  • a transformation temperature at which a crystal glass state collapses is within 180 to 240° C.
  • the transformation temperature may be defined as an intersection at which a tangent line passing through the glass state range having a constant storage elastic modulus is intersecting a tangent line passing through the transition range (or transition point) on a higher temperature side than the glass state range, which has a maximum change rate in storage elastic modulus.
  • the artificial hair fiber that meets the above-described requirements including the temperature and the viscoelasticity can be produced by appropriately adjusting the manufacturing conditions of the fiber and the blending ratio of the raw materials.
  • the resin composition consists primarily of thermoplastic resin (50% by mass or more) and contains additives such as a flame retardant, filler, a coloring agent and antioxidant.
  • the viscoelasticity (such as E′ and E′′) can be adjusted by changing a mixing ratio of two or more kinds of thermoplastic resin, or a mixing ratio of thermoplastic resin and additives (a flame retardant, filler and the like).
  • thermoplastic resin having different glass-transition temperatures, it is possible to produce an artificial hair fiber whose elasticity significantly changes in both the formation temperature range and the post-formation temperature range.
  • the viscoelasticity it is possible to adjust the viscoelasticity by adjusting the manufacturing conditions of the fiber. For example, it is possible to control the viscoelasticity by changing the draw ratio and the stretch ratio appropriately.
  • the draw ratio means a ratio for the drawing of the fiber after being discharged from the nozzle hole until being cooled.
  • the stretch ratio means a ratio for the stretching of an un-stretched yarn (a magnification for a yarn to be stretched)
  • the manufacturing process of the artificial hair fiber includes the steps of: heating and melting a composition containing thermoplastic resin; discharging the melted composition from the nozzle hole; (if necessary) passing the composition through a heating sleeve; and cooling it to obtain an un-stretched yarn.
  • the draw ratio means a ratio for the drawing of the fiber after the fiber is discharged from the nozzle until being cooled and becoming an un-stretched yarn.
  • the ratio for the drawing can be calculated based on a ratio of a speed at which the un-stretched yarn is taken up to a speed at which the fiber is discharged from the nozzle.
  • the un-stretched yarn is subjected to a stretching process in order to improve the tensile strength of the fiber.
  • the stretching process the un-stretched yarn once having been cooled is stretched while being heated at a lower temperature than the heating and melting temperature when the yarn is produced.
  • the stretch ratio means a ratio for the stretching of the un-stretched yarn (before being heated and stretched) until being stretched. This stretch ratio can be calculated based on a ratio of a speed at which the un-stretched yarn is wound off to a speed at which the stretched yarn is wound up.
  • thermoplastic resin should not be limited in use, and it is possible to use vinyl chloride resin, acrylic resin, polypropylene resin, polylactic resin, polyester resin, polyamide resin and the like. However, when only a resin with a low heat resistance, such as vinyl chloride resin, is used, the fiber will be damaged in the post-formation under a high temperature (180° C. or higher). Therefore, it is preferred that heat resistant resin such as polyamide resin and polyester resin is used independently or in combination.
  • the present invention prefers to use a polyamide fiber primarily consisting of polyamide resin and a polyester fiber primarily consisting of polyester resin, since they are easy to process and have a desired strength.
  • the polyamide fiber or the polyester fiber is made of a composition obtained by mixing 5 to 30 parts by weight of phosphorous or bromine flame retardant and 100 parts by weight of polyamide resin (or polyester resin) and melt-kneading them.
  • the flame resistance can be significantly improved by combining the resin and a certain percentage of a phosphorous or bromine flame retardant.
  • the polyamide resin used for the polyamide fiber should not be limited, but it is preferable to use at least one kind of resin selected from a group consisting of, for example, nylon 6; nylon 6,6; nylon 4,6; nylon 12; nylon 6,10; and nylon 6,12, and among them, nylon 6,6 is most preferable.
  • nylon 6,6 is most preferable.
  • the weight-average molecular weight (Mw) of the polyamide may be a value within a range from ten thousands to two hundred thousands, and to be more specific, may be ten thousand, twenty thousand, forty thousand, sixty thousand, eighty thousand, one hundred thousand, one hundred fifty thousand and two hundred thousand.
  • the kind of the polyester resin used for the polyester fiber should not be limited, it is possible to use polyethylene terephthalate, polyphenylene ether, polypropylene terephthalate, and polybutylene terephthalate. Among them, the polyethylene terephthalate is most preferable in view of the heat resistance.
  • the kind of the phosphorous flame retardant should not be limited, and it is possible to employ a generally used phosphorous flame retardant. To be more specific, it is possible to use a phosphate compound, a phosphonate compound, a phosphinate compound, a phosphine oxide compound, a phosphonite compound, a phosphinite compound and a phosphine compound. These compounds may be independently used, or two or more kinds of the compounds may be used together.
  • bromine flame retardant should not be limited, either. It is possible to employ a generally used bromine flame retardant. To be more specific, it is possible to use a bromine-containing phosphate ester flame retardant, such as pentabromotoluene, hexabromobenzene, decabromodiphenyl, decabromodiphenyl ether, bis(tribromophenoxy)ethane, tetrabromophtalic anhydride, ethylenebis(tetrabromophthalimide), ethylenebis(pentabromophenyl), octabromotrimethylphenylindane, and tris(tribromoneopentyl)phosphate; a brominated polystyrene flame retardant; a brominated poly(benzyl acrylate) flame retardant; a brominated epoxy flame retardant; a brominated phenoxy flame retardant; a brominated polycarbonate flame retardant; a bromine-
  • the content of the above-described phosphorous or bromine flame retardant is 5 to 30 parts by weight for 100 parts by weight of polyamide (polyester), and more preferably is 5 to 20 parts by weight. Within these ranges, it is possible to ensure a sufficient flame resistance and to prevent various physical properties from deteriorating.
  • 0.1 to 5 parts by weight of fine particles may be contained in 100 parts by weight of polyamide resin (or polyester resin).
  • polyamide resin or polyester resin
  • the ratio of the fine particles to 100 parts of the polyamide resin is preferably 0.2 to 3 parts by weight, and more preferably 0.2 to 2 parts by weight. This ratio can allow the above-described effect to be significant.
  • the average size of the fine particles is preferably 0.1 to 15 ⁇ m, more preferably 0.2 to 10 ⁇ m, and further more preferably 0.5 to 8 ⁇ m.
  • the above-described fine particles may be organic, or inorganic, or may include both organic and inorganic fine particles.
  • the kinds of organic fine particles should not be limited as long as at least part of them is not compatible with the polyamide or polyester resin, and for example, fine particles made of cross-linked acrylic resin or cross-linked polyester resin are applicable.
  • the above-described cross-linked acrylic particles may be obtained by dispersing acrylic monomers and a crosslinking agent in water, followed by crosslinking and curing.
  • the acrylic monomer used herein may include an acrylic acid and its derivatives, such as methyl acrylate, butyl acrylate, hexyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, acrylonitrile, acrylamide and N-methylolacrylamide.
  • the derivatives may include methyl methacrylate, butyl methacrylate, hexyl methacrylate, glycidyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, N-vinyl-2-pyrrolidone methacrylate, methacrylonitrile, methacrylamide, N-methylolmetacrylamide, 2-hydroxyethyl methacrylate, with each molecule having one vinyl group, thus forming a vinyl monomer.
  • These monomers may be used individually, or two or more kinds of these monomers may be used in combination.
  • the above-described cross-linked polyester particles may be obtained by dispersing unsaturated polyester and vinyl monomers in water and crosslinking and curing them.
  • the kind of unsaturated polyester used herein should not be limited.
  • the unsaturated polyester may be obtained, for example, by polymerizing an ⁇ , ⁇ -unsaturated acid or the mixture of the ⁇ , ⁇ -unsaturated acid and a saturated acid with dihydric alcohol or triatomic alcohol.
  • the unsaturated acid may include, for example, a fumaric acid, a maleic acid and an itaconic acid.
  • the saturated acid may include, for example, phthalic acid, terephthalic acid, succinic acid, glutaric acid, tetrahydrophthalic acid, adipic acid and sebacic acid.
  • the dihydric alcohol and the triatomic alcohol may include, for example, ethylene glycol, diethylene glycol, propylene glycol, neopentyl glycol, 1,3-propanediol, 1,6-hexanediol and trimethylolpropane.
  • vinyl monomer should not be limited, but may include, for example, styrene, chlorostyrene, vinyltoluene, divinylbenzene, acrylic acid, methylacrylate, acrylonitrile, ethylacrylate, and diallylphthalate.
  • crosslinking agent is not limited in use as long as it is a monomer that is a molecule having two or more vinyl groups, and more preferably, a monomer is a molecule having two vinyl groups.
  • a monomer used as a crosslinking agent should not be limited in use, but includes, for example, divinylbenzene, and a reaction product of glycol with methacrylic acid or acrylic acid, such as ethylene glycol dimethacrylate and neopentyl glycol dimethacrylate. It is preferred that an amount of the crosslinking agent is 0.02 to 5 parts by weight for 100 parts by weight of the acrylic monomer.
  • a polymerization initiator it is preferable to use a peroxide radical polymerization initiator.
  • a peroxide radical polymerization initiator may include, a benzoyl peroxide, 2-ethylhexyl perbenzoic acid, di-tert-butyl peroxide, cumene hydroperoxide and methyl ethyl ketone peroxide. It is preferred that an amount of the radical polymerization initiator is 0.05 to 10 parts by weight for 100 parts by weight of the acrylic monomer.
  • inorganic fine particles it is preferable to have an index of refraction similar to that of polyamide and/or a phosphorous-containing flame retardant, in view of an influence on the transparency and the color development of the fiber.
  • an index of refraction similar to that of polyamide and/or a phosphorous-containing flame retardant, in view of an influence on the transparency and the color development of the fiber.
  • a flame retardant an auxiliary agent, a heat resisting agent, a light stabilizer, a fluorescent agent, an oxidation inhibitor, an antistatic agent, a plasticizer, a lubricant and a resin other than thermoplastic resin.
  • a coloring agent such as pigment, it is possible to produce pre-colored fiber (so-called “spun-dyed fiber”).
  • thermoplastic resin such as polyamide or polyester resin in a predetermined proportion in advance
  • kneading machine Various commonly used kneading machines may be employed as a melt-kneading apparatus.
  • a twin-screw extruder is preferable, since it is easy to adjust a kneading degree and easy to operate.
  • the kneaded material obtained by the melt-kneading is melt-spun to produce a spun yarn.
  • the kneaded material is melted in a melt-spinning device such as an extruder, a gear pump and a pipe sleeve, under a temperature of 27 to 310° C. Then, the kneaded material is passed through a heating sleeve, cooled to a glass-transition temperature or lower, and taken out at a speed of 50 to 5000 m/min, thereby producing a spun yarn.
  • the yarn may be cooled with cooling water in a water tank to control the fineness.
  • the cross-section of the artificial hair fiber may be formed into a cocoon shape, a Y-shape, an H-shape and an X-shape by using a spinning nozzle with a specially-shaped nozzle hole.
  • the obtained un-stretched yarn is subjected to a hot stretching process in order to improve the tensile strength of the fiber.
  • the hot stretching process may be performed by a two-step method or a direct stretching method.
  • the two-step method includes the steps of: winding an un-stretched yarn around a bobbin once; and stretching the yarn in a different step from a melt spinning step.
  • the direct stretching method includes stretching the un-stretched yarn following the melt spinning step without winding the un-stretched yarn around the bobbin.
  • the hot stretching process may be performed by a one-step stretching method or a multistep stretching method. In the one-step stretching method, the yarn is stretched to a desired stretch ratio in one step. In the multistep stretching method, the yarn is stretched two or more times to reach the desired stretch ratio.
  • heating means in the hot stretching process it is possible to use a heating roller, a heat plate, a steam jet device and a warm water tank, alone or in combination.
  • the fineness of the synthetic fiber 30 to 80 dtex, and preferably 35 to 75 dtex is suitable to be used for artificial hair.
  • a polyamide fiber is a non-crimped silk fiber, and its fineness is usually 10 to 100 dtex, preferably 30 to 80 dtex, and more preferably 35 to 75 dtex.
  • the produced synthetic fiber may be used as an artificial hair fiber as it is, its texture may be improved by coating it with a treatment agent containing an oil such as silicone oil.
  • a coating with a treatment agent may be done at any time, before, during and after processing the synthetic fiber into a hairpiece product.
  • a coating during the process for processing the synthetic fiber into a hairpiece product is most preferable.
  • the artificial hair fiber may not only be used alone for a hairpiece product (headdress product), but also used in combination with human hair or other artificial hairs.
  • the hairpiece product may include a wig, a hairpiece, a blade, a hair extension, doll's hair and the like.
  • the use of the artificial hair fiber should not be limited.
  • the artificial hair fiber of the present invention may also be used for false beard, false eyelash, false eyebrow and the like.
  • the polyamide (or polyester) fiber was produced by the following method. First, polyamide (or polyester) resin, phosphorous or bromine flame retardant and fine particles, all used as raw materials here, were dried to reduce their moisture content to 100 ppm or lower.
  • the raw materials used were as follows.
  • Nylon 6 Ube Industries, Ltd. 1013B
  • Nylon 6,6 Toray Industries, Inc. CM3001-N Phosphorous flame retardant:
  • Bromine flame retardant ALBEMARLE JAPAN CORPORATION, HP-7010 Fine particles: cross-linked acrylic particles 1.8 ⁇ m, Soken Chemical & Engineering Co., Ltd.
  • Polyester (PET) Mitsubishi Chemical Corporation, BK-2180
  • the blending ratios (mass ratio) of the materials are represented in the following table 1.
  • the dry-blended material was melt-kneaded at a temperature of 280° C. Then, the melt-kneaded material was formed into pellets.
  • the melt-kneading and the pellet-formation were performed by the twin-screw extruder.
  • the nozzle hole of the melt spinning machine has a circular cross section and is 0.5 mm in size.
  • Melted polymer pellets were discharged from the nozzle hole of the melt spinning machine at a temperature of 280° C. Then, the discharged melted polymer was cooled in the water tank (located 30 mm below the nozzle hole) at a temperature of 50° C., followed by being taken-up and wounded. In this way, an un-stretched yarn is produced.
  • the draw ratio was controlled by changing the speed at which the un-stretched yarn was wounded.
  • the produced un-stretched yarn was stretched to a length which is 4 times as long as the original length, and then is subjected to heat treatment. Then, the stretched yarn is wound at a speed of 30 m/min to produce a fiber primarily consisting of polyamide (or polyester).
  • a heat roller heated to 85° C. and 200° C., respectively, is used.
  • the fibers in examples 1 to 4 and comparative examples 1 to 2 were obtained.
  • the stretch ratio was controlled by changing the speed at which the un-stretched yarn was wound off.
  • a fiber bundle (length: 50 cm) was wound around an aluminum cylinder (diameter: 20 mm ⁇ ); each end of the fiber bundle was fixed to the aluminum cylinder; and the fiber bundle was put in an air-circulated oven at a temperature of 100° C. and heated for 30 minutes.
  • the aluminum cylinder around which the fiber bundle was wound was left in a thermostatic chamber for 24 hours.
  • the temperature in the thermostatic chamber is 23° C. and the relative humidity is 50%.
  • the fiber bundle was removed from the aluminum cylinder and suspended, with its one end fixed.
  • the degree of curling was evaluated based on a value obtained by dividing the curled fiber length from its root to the tip with the entire length (50 cm) of the un-curled fiber. The smaller the value, the greater the degree of curling.
  • Evaluation criteria were as follows, and A and B were acceptable values in the evaluation.
  • a and B are acceptable values in the evaluation.
  • test temperature is 23° C.
  • relative humidity is 50%
  • tensile speed 200 mm/min is 20 mm.
  • clearance distance between chucks
  • tensile strength (cN/dtex) was 1.0 or higher and 2.0 or lower
  • B tensile strength (cN/dtex) was 0.5 or higher and 3.0 or lower
  • C tensile strength (cN/dtex) was lower than 0.5 or higher than 3.0
  • Dynamic viscoelasticity was measured under the following conditions: frequency is 1.0 Hz; initial temperature is 30° C.; final temperature is 260° C.; and rate of temperature increase is 2° C./min.
  • the measuring equipment used in the measurement was DMS6100, which was available from SII Nanotechnology Inc. During the measurement, a bundle of forty pieces of fiber was sandwiched between the chucks with the chuck distance being 3 mm.
  • examples 1 to 4 the ratio of draw ratio D1 to stretch ratio D2 was 1.5 to 14.0, and the storage elastic modulus ratio (E′ 90 /E′ 150 ) was 3 to 20.
  • the degree of curling in oven and the processability, but also strength was excellent.
  • the storage elastic modulus ratio (E′ 90 /E′ 150 ) was 3.6 and the degree of curling in oven and the processability were not A, but B. This result was within an acceptable range. Further, in example 5, the ratio (D 1 /D 2 ) of the draw ratio D 1 to the stretch ratio D 2 was 1.5, and the processability was B. This result was also within an acceptable range.
  • the storage elastic modulus ratio (E′ 90 /E′ 150 ) was 18.5 and the degree of curling in oven and the physical property (tensile strength) was not A, but B. This result was also within an acceptable range.
  • the ratio (D 1 /D 2 ) of the draw ratio D 1 to the stretch ratio D 2 was 12, and the tensile strength (physical property) was B. This result was also within an acceptable range.
  • FIG. 2 shows the result of the measurement of the dynamic viscoelasticity in example 1.
  • FIG. 3 shows the result of the measurement of the dynamic viscoelasticity in comparative example 1.
  • the artificial hair fiber of comparative example 1 was not melted even at a high temperature of 240° C., and the storage elastic modulus E′ was maintained, exhibiting a high heat resistance.
  • the heat resistance was too high, the artificial hair fiber was not melted in the formation temperature range (90 to 150° C.), nor in the post-formation temperature range (180 to 240° C.), and both the storage elastic modulus E′ and the loss elastic modulus E′′ changed little.
  • the storage elastic modulus E′ and the loss elastic modulus E′′ significantly changed in both the formation temperature range and in the post-formation temperature range, and the formability is excellent.
  • M 1 shown in FIGS. 2 and 3 is a tangent line of the curve of the storage elastic modulus E′, which passes through the glass state range in which the curve is flat.
  • M 2 is a tangent line of the curve of the storage elastic modulus E′, which passes through a transition range in a higher temperature side than the glass state range.
  • the change rate of the storage elastic modulus is maximized in the transition range.
  • the crystal state is lost at intersection P at which the tangent line M 1 of the curve of the storage elastic modulus E′ passing through the glass state range intersects the tangent line M 2 of the curve of the storage elastic modulus E′ passing through the transition range, thereby starting the melting.
  • the artificial hair fiber of example 1 has the temperature at the intersection P within 180 to 240° C., and therefore can be processed with a commercially available hair iron (with a heating temperature of 240° C. or lower).
  • the artificial hair fiber of the comparative example 1 has the temperature at the intersection P higher than 240° C., and therefore it is not likely to be transformed by the heat of a commercially available hair iron.
  • the use of the artificial hair fiber of the present invention should not be limited, and the present invention is applicable to various hairpiece products for a headdress such as a wig, a hairpiece, a blade, and a hair extension, or for a doll's hair.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Materials For Medical Uses (AREA)
US14/114,539 2011-05-13 2012-05-11 Artificial hair fiber and hairpiece product Abandoned US20140109924A1 (en)

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US20170260391A1 (en) * 2014-12-09 2017-09-14 Denka Company Limited Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion
US10433605B2 (en) 2015-06-26 2019-10-08 Kaneka Corporation Acrylic fiber for artificial hair, manufacturing method therefor and head accessory containing same
US10477908B2 (en) 2015-03-30 2019-11-19 Kaneka Corporation Acrylic fiber for artificial hair, method for producing same, and head decoration product comprising same

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US20170260391A1 (en) * 2014-12-09 2017-09-14 Denka Company Limited Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion
US10385209B2 (en) * 2014-12-09 2019-08-20 Denka Company Limited Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion
US10477908B2 (en) 2015-03-30 2019-11-19 Kaneka Corporation Acrylic fiber for artificial hair, method for producing same, and head decoration product comprising same
US10433605B2 (en) 2015-06-26 2019-10-08 Kaneka Corporation Acrylic fiber for artificial hair, manufacturing method therefor and head accessory containing same

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KR101907049B1 (ko) 2018-10-11
JPWO2012157561A1 (ja) 2014-07-31
SG194688A1 (en) 2013-12-30
JP5914469B2 (ja) 2016-05-11
AP2013007287A0 (en) 2013-12-31
ZA201308463B (en) 2015-01-28
CN103501647A (zh) 2014-01-08
WO2012157561A1 (ja) 2012-11-22

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