Core-sheath composite fiber

Abstract

To provide a core-sheath type composite fiber that can permanently maintain a curled state.SOLUTION: There is provided a core-sheath type composite fiber that is composed of a polyamide resin or polybutylene terephthalate as a first resin, and a polyolefin resin selected from linear low-density polyethylene, polypropylene homopolymer, and polypropylene ethylene random copolymer as a second resin, wherein the second resin forms a core, the first resin surrounds the core in a sheath shape to bond therebetween, a center position of the second resin is shifted from a center position of the composite fiber, and the fiber has a crimping property.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a core-sheath type composite fiber. [Background technology]

[0002] Conventionally, doll toys with curly hair have been made by heating doll hair with a heater, passing the hair through two meshing gears that have been adjusted to lengthen or shorten the gear pitch, folding pre-heated hair into a chamber and then curling it with moist heat, or passing the hair through a slit and then curling it with swirling compressed air (see, for example, Patent Document 1). However, hair having the above-mentioned curls is difficult to maintain its curliness, and doll toys having hair implanted on the heads of dolls are unable to maintain the curled state permanently, which impairs the marketability of the product. [Patent Document 1] Japanese Patent Application Publication No. 6-287801 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0003] The present invention aims to provide a core-sheath type composite fiber that can maintain a curled state permanently. [Means for solving the problem]

[0004] The present invention provides a first resin Selected from 12 nylon and 6-12 copolymer nylon Polyamide resin Fat and , linear low density polyethylene as the second resin , Po and a polyolefin resin selected from the group consisting of a polypropylene ethylene random copolymer and a polypropylene ethylene random copolymer, wherein the second resin forms a core, and the first resin surrounds and bonds to the periphery of the core in a sheath shape, and the central position of the second resin is offset from the central position of the composite fiber. Furthermore, ,beforeThe first resin or the second resin is required to contain a reversible thermochromic material or a photochromic material. Effect of the Invention

[0005] The present invention can provide a core-sheath type conjugate fiber that can permanently maintain a curled state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] The core-sheath type composite fiber of the present invention is a composite fiber that is composed of a first resin and a second resin having a different chemical composition, and is imparted with crimping properties by shifting the center position of the second resin from the center position of the composite fiber. The cross-sectional shape of the composite fiber may be a circle, an ellipse, a regular polygon, or the like. In addition, when the shape of the composite fiber and the second resin makes it impossible to specify the central position, a composite fiber having crimping properties can be obtained by shifting the center of gravity of the second resin from the center of gravity of the composite fiber.

[0007] The first resin and the second resin constituting the composite fiber are not particularly limited as long as they have different chemical compositions, and examples thereof include linear low density polyethylene, low density polyethylene, medium high density polyethylene, ultra high density polyethylene, chlorinated polyethylene, polypropylene, chlorinated polypropylene, polyisobutylene, polybutadiene, polymethylpentene, polystyrene, polyethylene terephthalate, polybutylene terephthalate, polyvinyl acetate, vinyl chloride resin, chlorinated polyvinyl chloride, polyvinylidene chloride, acrylic acid ester resin, methacrylic acid ester resin, polyamide, copolymerized polyamide, polyamideimide, polyacetal, polyvinyl formal, polyvinyl butyral, polyarylate, polyetherimide, polyetheretherketone, polycarbonate, polyphenyl ether, polyphenylene sulfide, polysulfone, fluororesin, ionomer resin, polyolefin resin, ethylene-propylene copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl alcohol copolymer resin, ethylene-acrylic acid ester copolymer resin, ethylene-methacrylic acid ester copolymer resin, ethylene ethylene-vinyl chloride copolymer resin, vinyl chloride-propylene copolymer resin, vinyl chloride-vinylidene chloride copolymer resin, styrene-butadiene copolymer resin, acrylonitrile-vinylidene chloride copolymer resin, acrylonitrile-styrene copolymer resin, acrylonitrile-ethylene-styrene copolymer resin, acrylonitrile-butadiene-styrene copolymer resin, acrylonitrile-chlorinated polyethylene-styrene copolymer resin, acrylonitrile-acrylate-styrene copolymer resin, ethylene-vinyl acetate resin-vinyl chloride graft copolymer resin, methacrylic Examples of the elastomer include methyl acetate-butadiene-styrene copolymer resin, styrene-based thermoplastic elastomer, olefin-based plastic elastomer, urethane-based plastic elastomer, polyester-based plastic elastomer, 1,2-polybutadiene-based plastic elastomer, vinyl chloride-based plastic elastomer, petroleum-based hydrocarbon resin, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, nitrocellulose, low molecular weight polyethylene, low molecular weight polypropylene, polybutene, coumarone-indene copolymer, and phenoxy plastic. Of the above resins, polyamide resins and polybutylene terephthalate, which have excellent fiber-forming properties, are suitable as the first resin, and polyolefin resins are suitable as the second resin. As the polyamide resin, nylon 6, 6,6, 6,9, 610, nylon 11, nylon 12, 6-11 copolymer nylon, 6-12 copolymer nylon, 6,9-12 copolymer nylon, and polyamide elastomer are preferably used, and as the polyolefin resin, linear low-density polyethylene, polypropylene homopolymer, and polypropylene-ethylene random copolymer are preferably used.

[0008] The composite fiber may be of a core-sheath type in which the second resin forms a core and the first resin surrounds and bonds to the core, or a bonded type in which the first resin and the second resin are bonded in parallel, or the like. By shifting the center position of the second resin from the center position of the composite fiber, the fiber has crimpability, and the crimpability is further improved by heating. A package is obtained by winding the composite fiber around a cylinder, and a doll or an animal-shaped toy is obtained by implanting the composite fiber led out from the package. The doll or animal-shaped toy can be heated after the hair is implanted to improve the crimpability, and the crimpability can be effectively expressed by heating at a temperature higher than the heat-setting temperature after stretching during spinning of the composite fiber.

[0009] The outer diameter of the composite fiber is in the range of 30 to 200 μm, and more preferably 40 to 120 μm. Diameters less than 30 μm are too thin and not suitable for use as hair, while diameters exceeding 200 μm are too thick and make it difficult to exhibit the properties of hair.

[0010] Ordinary pigments, fluorescent pigments, reversible thermochromic materials, photochromic materials, etc. can be added to the first and second resins to obtain fibers that exhibit various colors. The reversible thermochromic material is effectively a reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing three components, an electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium that reversibly induces a color reaction, is encapsulated in a microcapsule. The reversible thermochromic microencapsulated pigment is contained in the resin in an amount of 0.5 to 40% by mass, preferably 1 to 30% by mass. If the blending amount is less than 0.5% by mass, it is difficult to visually obtain a clear thermochromic effect, whereas if it exceeds 40% by mass, it is excessive and may leave residual color even in the faded state. As the photochromic material, photochromic compounds such as spirooxazine compounds, spiropyran compounds, and diarylethene compounds are effective.

[0011] Furthermore, various general-purpose plasticizers, for example, phthalic acid-based, aliphatic dibasic acid ester-based, phosphate ester-based, epoxy-based, phenol-based, trimellitic acid-based, etc., may be blended to impart flexibility, and calcium carbonate, magnesium carbonate, titanium oxide, talc, etc. may be added to improve processability, physical properties, etc. EXAMPLES

[0012] The core-sheath type composite fiber of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, the blend ratios are in parts by mass. Example 1 Making hair for dolls or animal toys The first resin was 6-12 copolymer nylon (melting point 145°C) with an MFR (melt flow rate) of 80 g / 10 min as the sheath resin, and the second resin was 99 parts of random copolymer polypropylene (load deflection temperature 80°C) with an MFR of 30 g / 10 min to which 1 part of brown colorant was added as the core resin. Using a general-purpose composite fiber melt spinning device, the fibers were spun at 200°C from a die with 18 discharge holes to form a core-sheath composite fiber with a weight ratio of 50 / 50, and the fibers were stretched to obtain a brown multifilament consisting of 18 filaments with an outer diameter of approximately 80 μm. At this time, the nozzle of the spinning device was set so that the center position of the core was shifted by 20% of the radius from the center position of the entire fiber. In the spinning process of the multifilament, it can be produced in the same manner as a normal core-sheath type composite fiber in which the core is located at the center of the fiber, and hair for dolls or animal-shaped toys is obtained as a thread tube (package) wound around a cylinder.

[0013] Doll toy manufacturing The multifilaments drawn out from the package were implanted in the head of a plastic doll, which was then combined with the body to obtain a toy doll. The hair provided on the doll toy is curled due to its crimping property, and the curled state can be permanently maintained, thereby providing a doll toy that satisfies marketability.

[0014] Example 2 Making hair for dolls or animal toys The first resin was 12 nylon (melting point 178°C) with an MFR of 20 g / 10 min as the sheath resin, and the second resin was 99 parts of random copolymer polypropylene (load deflection temperature 100°C) with an MFR of 20 g / 10 min to which 1 part of brown colorant was added as the core resin. Using a general-purpose composite fiber melt spinning device, the fibers were spun at 210°C from a die with 24 discharge holes to form a core-sheath composite fiber with a weight ratio of 60 / 40, and then stretched to obtain a brown multifilament consisting of 24 filaments with an outer diameter of approximately 60 μm. At this time, the nozzle of the spinning device was set so that the center position of the core was shifted by 15% of the radius from the center position of the entire fiber. In the spinning process of the multifilament, it can be produced in the same manner as a normal core-sheath type composite fiber in which the core is located at the center of the fiber, and hair for dolls or animal-shaped toys is obtained as a thread tube (package) wound around a cylinder.

[0015] Doll toy manufacturing The multifilaments drawn out from the package were implanted in the head of a plastic doll, which was then combined with the body to obtain a toy doll. The hair provided on the doll toy is curled due to its crimping property, and the curled state can be permanently maintained, thereby providing a doll toy that satisfies marketability. Furthermore, by heating the doll toy, the crimping property was improved, and tight curls could be imparted to the toy.

[0016] Example 3 Preparation of reversible thermochromic microencapsulated pigments A reversible thermochromic composition consisting of 2 parts of 1,2-benz-6-diethylaminofluoran, 6 parts of 1,1-bis(4-hydroxyphenyl)-n-octane, and 50 parts of stearyl caprate was microencapsulated by an epoxy resin / amine interfacial polymerization method to obtain a reversible thermochromic microencapsulated pigment having an average particle size of 10 μm. The microencapsulated pigment reversibly changes color from colorless at 34° C. or higher to pink at about 28° C. or lower.

[0017] 3 parts of the microcapsulated pigment and 97 parts of linear low-density polyethylene (melting point 120° C.) with MFR of 30 g / 10 min were mixed, and melt-mixed in an extruder at 180° C. to obtain a reversible thermochromic thermoplastic resin.

[0018] Manufacture of hair for dolls or animal-shaped toys As the first resin, 6-12 copolymer nylon (melting point 145°C) with an MFR of 80 g / 10 min was used as the sheath resin, and as the second resin, the above-mentioned reversible thermochromic thermoplastic resin was used as the core resin. Using a general-purpose composite fiber melt spinning device, the fibers were spun at 200°C from a die with 18 discharge holes to form a core-sheath composite fiber with a weight ratio of 50 / 50, and then stretched to obtain a pink multifilament consisting of 18 filaments with an outer diameter of approximately 80 μm. At this time, the nozzle of the spinning device was set so that the center position of the core was shifted by 20% of the radius from the center position of the entire fiber. In the spinning process of the multifilament, it can be produced in the same manner as a normal core-sheath type composite fiber in which the core is located at the center of the fiber, and hair for dolls or animal-shaped toys is obtained as a thread tube (package) wound around a cylinder.

[0019] Creation of animal-shaped toys The multifilaments drawn out from the package were grafted onto a plastic dog toy to obtain an animal-shaped toy with fur. The animal shaped toy has hair that is curled due to its shrinkability, and the hair can be kept in the curled state for a long time, thereby providing an animal shaped toy that satisfies marketability. Moreover, the animal-shaped toy was able to reversibly change the color of its body hair from colorless at 34° C. or higher to pink at 28° C. or lower.

Claims

1. A sheath-core composite fiber comprising a first resin being a polyamide resin selected from nylon 12 and nylon 6-12 copolymer, and a second resin being a polyolefin resin selected from linear low-density polyethylene and polypropylene-ethylene random copolymer, the second resin forming a core and the first resin surrounding and bonding to the periphery of the core in a sheath shape, the sheath-core composite fiber having a crimping property such that the central position of the second resin is shifted from the central position of the composite fiber.

2. A core-sheath type composite fiber as described in claim 1, wherein the first resin or the second resin contains a reversible thermochromic material or a photochromic material.