EP3626869B1 - Crimped fibers and nonwoven cloth - Google Patents

Crimped fibers and nonwoven cloth Download PDF

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Publication number
EP3626869B1
EP3626869B1 EP18801410.4A EP18801410A EP3626869B1 EP 3626869 B1 EP3626869 B1 EP 3626869B1 EP 18801410 A EP18801410 A EP 18801410A EP 3626869 B1 EP3626869 B1 EP 3626869B1
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EP
European Patent Office
Prior art keywords
thermoplastic resin
crimped fiber
component
resin
fiber according
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EP18801410.4A
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German (de)
English (en)
French (fr)
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EP3626869A1 (en
EP3626869C0 (en
EP3626869A4 (en
Inventor
Mari YABE
Takumi SUGIUCHI
Yutaka Minami
Tomoaki Takebe
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Publication of EP3626869C0 publication Critical patent/EP3626869C0/en
Publication of EP3626869B1 publication Critical patent/EP3626869B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D04H3/147—Composite yarns or filaments
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • 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
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene

Definitions

  • the present invention relates to a crimped fiber and a nonwoven fabric.
  • thermally fusible conjugate fiber in which three kinds of resin components having a different melting point or softening point from each other are disposed at a specified position in a short-direction cross section of the fiber so as to have high bulkiness, high nonwoven fabric strength, and stretchability when used for a nonwoven fabric (see PTL 1).
  • latently crimpable conjugate fiber using a core-sheath type composite material using polyolefins having a different melting point from each other (see PTL 2).
  • the present invention has been made, and an object thereof is to provide a crimped fiber having high crimping properties and a nonwoven fabric including the crimped fiber.
  • the "crimped fiber” is used in a meaning including a conjugated spun fiber of a combination of different thermoplastic resins made using a side-by-side type nozzle, an eccentric core-sheath type nozzle, a deformed nozzle, or a divided nozzle.
  • the core-sheath type fiber refers to a fiber whose cross section is composed of a "core” as an inner layer and a “sheath” as an outer layer
  • the eccentric core-sheath type fiber refers to a fiber in which in the cross-sectional shape thereof, the center of gravity of an inner layer part is different from the center of gravity of the whole of the fiber.
  • the component containing the thermoplastic resin (A) is referred to as a "first component”
  • the component containing the thermoplastic resin (B) and the thermoplastic resin (C) is referred to as a "second component”.
  • the crimped fiber is a side-by-side type fiber
  • one of the components constituting the side-by-side type fiber is referred to as the "first component”
  • the other component is referred to as the "second component”.
  • the crimped fiber is a core-sheath type fiber
  • either one of the component to be used for the core layer composition and the component to be used for the sheath layer composition of the core-sheath type fiber is referred to as the "first component”, with the other being referred to as the "second component”.
  • the crimped fiber of the present embodiment is a crimped fiber including one component thereof containing a thermoplastic resin (A) and another component thereof containing a thermoplastic resin (B) and a thermoplastic resin (C), wherein a half-crystallization time at 25°C of the thermoplastic resin (A) is shorter than ⁇ half-crystallization time at 25°C of the thermoplastic resin (B), and a half-crystallization time at 25°C of the thermoplastic resin (C) is longer than the half-crystallization time at 25°C of the thermoplastic resin (B).
  • thermoplastic resin (A), the thermoplastic resin (B), and the thermoplastic resin (C) satisfy the aforementioned relations, a difference between the half-crystallization time at 25°C of the first component containing the thermoplastic resin (A) and the half-crystallization time at 25°C of the second component containing the thermoplastic resin (B) and the thermoplastic resin (C) becomes larger, so that a crimped fiber having higher crimping properties can be provided.
  • the half-crystallization time was measured by the following method.
  • melt flow rate (MFR) of the thermoplastic resin (A) is smaller than an MFR of the thermoplastic resin (B); and that the MFR of the thermoplastic resin (B) is smaller than an MFR of the thermoplastic resin (C).
  • the melt flow rate (MFR) is measured by the measurement method prescribed in JIS K7210, and it is measured under a condition at a temperature of 190°C and a load of 2.16 g with respect to the thermoplastic resin (A) and under a condition at a temperature of 230°C and a load of 2.16 g with respect to the thermoplastic resin (B) and the thermoplastic resin (C), respectively.
  • a melting point (Tm-D) of the thermoplastic resin (A) defined as a peak top of a peak observed on the highest temperature side of a melting endothermic curve obtained by holding under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) is lower than a melting point (Tm-D) of the thermoplastic resin (B) defined under the aforementioned condition; and that the melting point (Tm-D) of the thermoplastic resin (B) is higher than a melting point (Tm-D) of the thermoplastic resin (C) defined under the aforementioned condition.
  • the half-crystallization time at 25°C is shorter than the half-crystallization time at 25°C of the thermoplastic resin (B) as mentioned later, and is preferably 0.01 seconds or less.
  • the half-crystallization time at 25°C of the thermoplastic resin (A) is 0.01 seconds or less, a crimped fiber having higher crimping properties is obtained.
  • the melt flow rate (MFR) of the thermoplastic resin (A) is preferably 1 g/10 min or more, more preferably 5 g/10 min or more, still more preferably 10 g/10 min or more, and yet still more preferably 15 g/10 min or more, and it is preferably 70 g/10 min or less, more preferably 45 g/10 min or less, still more preferably 30 g/10 min or less, and yet still more preferably 20 g/10 min or less.
  • melt flow rate is measured by the measurement method prescribed in JIS K7210, and it is measured under a condition at a temperature of 190°C and a load of 2.16 kg.
  • the melting point (Tm-D) of the thermoplastic resin (A) defined as a peak top of a peak observed on the highest temperature side of a melting endothermic curve obtained by holding under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) is preferably 90°C or higher, more preferably 100°C or higher, and still more preferably 115°C or higher, and it is preferably 135°C or lower, and more preferably 130°C or lower.
  • the thermoplastic resin (A) is a polyethylene-based resin and preferably a polyethylene-based resin using a so-called metallocene catalyst having a narrow molecular weight distribution.
  • the polyethylene-based resin may be either an ethylene homopolymer or a copolymer.
  • a copolymerization ratio of an ethylene unit is more than 50 mol%, preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 90 mol% or more, and yet still more preferably 95 mol% or more.
  • a copolymerizable monomer is, for example, an ⁇ -olefin having 3 to 30 carbon atoms, and specific examples thereof include 1-butene, 1-pentene, 1-hexene, 1-octene, and 1-decene.
  • Examples of commercially available products of the ethylene homopolymer include “ASPUN TM " Series (for example, “ASPUN XUS 61800.52 LE” and “ASPUN 6834E” (manufactured by The Dow Chemical Company).
  • examples of commercially available products of a copolymer of ethylene and octene include "AFFINITY GA1900”, “AFFINITY GA1950”, “AFFINITY EG8185”, “AFFINITY EG8200”, “ENGAGE 8137", “ENGAGE 8180”, and “ENGAGE 8400”, all of which are manufactured by The Dow Chemical Company (all of them are a trade name).
  • the crimping properties of the resulting crimped fiber can be enhanced; however, end breakage is liable to occur, and spinnability is lowered.
  • Mw weight average molecular weight
  • the crimping properties of the resulting crimped fiber can be enhanced; however, end breakage is liable to occur, and spinnability is lowered.
  • the crimped fiber of the present embodiment by using, as the second component, the component having the thermoplastic resin (C) added to the thermoplastic resin (B) as mentioned later, the end breakage can be suppressed, the spinnability can be enhanced, and furthermore, the crimping properties can be enhanced.
  • the content of the thermoplastic resin (A) in the first component is preferably 80% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more, and its upper limit value is 100% by mass.
  • the half-crystallization time at 25°C of the thermoplastic resin (B) which is used in the present embodiment is shorter than the half-crystallization temperature at 25°C of the thermoplastic resin (C) as mentioned later, and is more than 0.01 seconds, more preferably 0.02 seconds or more, still more preferably 0.03 seconds or more, and yet still more preferably 0.04 seconds or more, and it is preferably 0.06 seconds or less, more preferably less than 0.06 seconds, and still more preferably 0.05 seconds or less.
  • the half-crystallization time at 25°C of the thermoplastic resin (B) is more than 0.01 seconds, a difference from the half-crystallization time at 25°C of the thermoplastic resin (A) is generated, so that the crimping properties of the crimped fiber can be enhanced.
  • the melt flow rate (MFR) of the thermoplastic resin (B) is preferably 10 g/10 min or more, and more preferably 30 g/10 min or more, and it is preferably 500 g/10 min or less.
  • melt flow rate is measured by the measurement method prescribed in JIS K7210, and it is measured under a condition at a temperature of 230°C and a load of 2.16 kg.
  • the melting point (Tm-D) of the thermoplastic resin (B) defined as a peak top of a peak observed on the highest temperature side of a melting endothermic curve obtained by holding under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) is preferably 120°C or higher, more preferably 130°C or higher, and still more preferably 140°C or higher, and it is preferably 200°C or lower, more preferably 180°C or lower, and still more preferably 170°C or less.
  • DSC differential scanning calorimeter
  • the thermoplastic rein (B) is a polypropylene-based resin.
  • the polypropylene-based resin may be a propylene homopolymer or may also be a copolymer; however, it is preferably a propylene homopolymer using a so-called metallocene catalyst having a narrow molecular weight distribution.
  • a copolymerization ratio of a propylene unit is 50 mol% or more, preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 90 mol% or more, and especially preferably 95 mol% or more.
  • Examples of a copolymerizable monomer include ⁇ -olefins having 2 carbon atoms or 4 to 20 carbon atoms, such as ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 1-decene; acrylic acid esters, such as methyl acrylate; and vinyl acetate. From the viewpoint of spinnability, a propylene homopolymer is preferred.
  • thermoplastic resin (B) a polypropylene-based resin resulting from polymerization using a catalyst other than the metallocene-based catalyst (for example, a Ziegler-Natta catalyst) may be contained. These may be used alone or may be used in combination of two or more thereof.
  • a catalyst other than the metallocene-based catalyst for example, a Ziegler-Natta catalyst
  • Specific examples thereof include a peroxide-containing propylene-based resin.
  • Examples of commercially available products of the propylene homopolymer include "NOVATEC TM PP” Series (for example, “NOVATEC SA03”) (manufactured by Japan Polypropylene Corporation).
  • examples of commercially available products of the peroxide-containing propylene homopolymer resulting from polymerization using a catalyst other than the metallocene-based catalyst include "Moplen” Series (for example, “Moplen HP461Y”) (manufactured by Lyondell Basell); and PP3155 (a trade name, manufactured by ExxonMobil Chemical Corporation).
  • Examples of commercially available products of the polypropylene-based resin resulting from polymerization using a metallocene-based catalyst include "Metocene” Series (for example, “Metocene MF650Y”) (manufactured by Lyondell Basell).
  • a polypropylene-based resin resulting from polymerization using a metallocene-based catalyst is preferred.
  • the content of the thermoplastic resin (B) in the second component is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, and yet still more preferably 80% by mass or more, and it is preferably 99% by mass or less, more preferably 97% by mass or less, and still more preferably 95% by mass or less.
  • the half-crystallization time at 25°C of the thermoplastic resin (C) which is used in the present embodiment is longer than that of the thermoplastic resin (B), and is 0.06 seconds or more.
  • the half-crystallization time at 25°C of the thermoplastic resin (C) is 0.06 seconds or more, a difference between the half-crystallization time at 25°C of the first component and the half-crystallization time at 25°C of the second component can be made larger, and the crimping properties of the crimped fiber can be more enhanced.
  • the melt flow rate (MFR) of the thermoplastic resin (C) is preferably 10 g/10 min or more, and more preferably 500 g/10 min or more, and it is preferably 5,000 g/10 min or less.
  • MFR is 10 g/10 min or more, a difference between the MFR of the first component and the MFR of the second component can be made larger, and the crimping properties of the crimped fiber can be more enhanced.
  • melt flow rate is measured by the measurement method prescribed in JIS K7210, and it is measured under a condition at a temperature of 230°C and a load of 2.16 kg.
  • the melting point (Tm-D) of the thermoplastic resin (C) defined as a peak top of a peak observed on the highest temperature side of a melting endothermic curve obtained by holding under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) is preferably 50°C or higher, and more preferably 60°C or higher, and it is preferably 100°C or lower.
  • DSC differential scanning calorimeter
  • a weight average molecular weight (Mw) of the thermoplastic resin (C) is preferably 30,000 or more, and it is preferably 150,000 or less, and more preferably 60,000 or less.
  • a molecular weight distribution (Mw/Mn) of the thermoplastic resin (C) is preferably less than 3.0, more preferably 2.5 or less, and still more preferably 2.3 or less. When the molecular weight distribution of the thermoplastic resin (C) falls within the aforementioned range, the generation of stickiness in the fiber obtained by spinning is suppressed.
  • the aforementioned weight average molecular weight (Mw) and the molecular weight distribution (Mw/Mn) are determined by means of a gel permeation chromatography (GPC) measurement.
  • the weight average molecular weight is a weight average molecular weight expressed in terms of polystyrene, as measured by using the following device under the following condition, and the molecular weight distribution is a value calculated from a number average molecular weight (Mn) as measured similarly and the aforementioned weight average molecular weight.
  • thermoplastic resin (C) a melting endotherm ( ⁇ H-D) obtained from a melting endothermic curve obtained by holding a sample under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) is preferably 0 J/g or more, more preferably 10 J/g or more, and still more preferably 20 J/g or more, and it is preferably 80 J/g or less, more preferably 60 J/g or less, and still more preferably 40 J/g or less.
  • DSC differential scanning calorimeter
  • the melting endotherm ( ⁇ H-D) is calculated by determining an area surrounded by a line containing a peak of a melting endothermic curve obtained by holding a sample under a nitrogen atmosphere at -10°C for 5 minutes and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC) and a line connecting a point on the low-temperature side free from a change of the amount of heat with a point on the high-temperature side free from a change of the amount of heat (this line is referred to as a baseline).
  • DSC differential scanning calorimeter
  • the thermoplastic resin (c) is a polypropylene-based resin.
  • the polypropylene-based resin may be either a propylene homopolymer or a copolymer. From the viewpoint of suppressing stickiness, a polypropylene-based resin resulting from polymerization using a metallocene-based catalyst is performed.
  • propylene homopolymer examples include low-molecular weight polypropylene, and preferably L-MODU (manufactured by Idemitsu Kosan Co., Ltd.) and Moplen (manufactured by Lyondell Basell), each being synthesized using a metallocene-based catalyst. These may be used alone or may be used in admixture of two or more thereof.
  • L-MODU manufactured by Idemitsu Kosan Co., Ltd.
  • Moplen manufactured by Lyondell Basell
  • a copolymerization ratio of a propylene unit is more than 50 mol%, preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 90 mol% or more, and yet still more preferably 95 mol% or more.
  • a copolymerizable monomer is at least one selected from the group consisting of ethylene and an ⁇ -olefin having 4 to 30 carbon atoms, and specific examples thereof include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 1-decene.
  • the polypropylene-based resin preferably contains at least one structural unit selected from the group consisting of ethylene and an ⁇ -olefin having 4 to 30 carbon atoms in an amount of more than 0 mol% and 20 mol% or less.
  • the polypropylene-based resin can be produced using a metallocene-based catalyst described in, for example, WO 2003/087172 A .
  • a metallocene-based catalyst using a transition metal compound in which a ligand forms a crosslinked structure via a crosslinking group is preferred.
  • a metallocene-based catalyst obtained by combining a transition metal compound in which a crosslinked structure is formed via two crosslinking groups with a cocatalyst is preferred.
  • examples thereof include a polymerization catalyst containing
  • the transition metal compound that is the aforementioned component (i) is preferably a transition metal compound in which the ligand is of a (1,2')(2,1') double crosslinking type, and examples thereof include (1,2'-dimethylsilylene)(2,1'-dimethylsilylene)-bis(3-trimethylsilylmethylinden yl)zirconium dichloride.
  • the compound that is the aforementioned component (ii-1) include triethylammonium tetraphenylborate, tri-n-butylammonium tetraphenylborate, trimethylammonium tetraphenylborate, tetraethylammonium tetraphenylborate, methyl(tri-n-butyl)ammonium tetraphenylborate, benzyl(tri-n-butyl)ammonium tetraphenylborate, dimethyldiphenylammonium tetraphenylborate, triphenyl(methyl)ammonium tetraphenylborate, trimethylanilinium tetraphenylborate, methylpyridinium tetraphenylborate, benzylpyridinium tetraphenylborate, methyl(2-cyanopyridinium) tetraphenylborate, triethylam
  • Examples of the aluminoxane that is the aforementioned component (ii-2) include known chain aluminoxanes and cyclic aluminoxanes.
  • the polypropylene-based resin may also be produced by jointly using an organoaluminum compound, such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride, diisobutylaluminum hydride, diethylaluminum hydride, and ethylaluminum sesquichloride.
  • organoaluminum compound such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride, diisobut
  • the content of the thermoplastic resin (C) in the second component is preferably 1% by mass or more, more preferably 3% by mass or more, and still more preferably 5% by mass or more, and it is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, and yet still more preferably 20% by mass or less.
  • the content of the thermoplastic resin (C) in the second component is 1% by mass or more, it becomes possible to achieve reduction of the fiber diameter, and the flexibility of the nonwoven fabric is improved with a decrease of the elastic modulus of the fiber.
  • the content of the thermoplastic resin (C) occupying in the sum total of the thermoplastic resin (A), the thermoplastic resin (B), and the thermoplastic resin (C) is 1% or more, more preferably 2% or more, and still more preferably 5% or more, and it is 50% or less, more preferably 30% or less, and still more preferably 20% or less.
  • At least one of the first component and the second component can be compounded with an arbitrary additive within a range where the effects of the present embodiment are not impaired.
  • the additive include a foaming agent, a crystal nucleating agent, a weatherability stabilizer, a UV absorber, a light stabilizer, a heat resistance stabilizer, an antistatic agent, a release agent, a flame retardant, a synthetic oil, a wax, an electric property-improving agent, a slip inhibitor, an anti-blocking agent, a viscosity-controlling agent, a coloring inhibitor, a defogging agent, a lubricant, a pigment, a dye, a plasticizer, a softening agent, an age resistor, a hydrochloric acid-absorbing agent, a chlorine scavenger, an antioxidant, and an antitack agent.
  • a mass ratio of the first component containing the thermoplastic resin (A) to the second component containing the thermoplastic resin (B) and the thermoplastic resin (C) is preferably 9/1 to 1/9, and more preferably 7/3 to 3/7.
  • examples of the crimped fiber of the present embodiment include a side-by-side type fiber, a core-sheath type fiber, and an eccentric core-sheath type fiber, a side-by-side type fiber is preferred.
  • the crimped fiber of the present embodiment is divided into the case where the component containing the thermoplastic resin (A), preferably the component containing a polyethylene-based resin, is located inside the crimp; and the case where the component containing the thermoplastic resin (B), preferably the component containing a polypropylene-based resin, is located inside the crimp, depending upon a spinning condition and the like.
  • the component containing the thermoplastic resin (A) preferably the component containing a polyethylene-based resin
  • B preferably the component containing a polypropylene-based resin
  • thermoplastic resin (A) is a polyethylene-based resin
  • thermoplastic resin (B) is a polypropylene-based resin
  • thermoplastic resin (C) when the thermoplastic resin (C) is not added, since the spinning speed and spinnability are not improved, the spinning speed is not increased, so that the spinning is performed only at a low speed.
  • the polyethylene-based resin In the case where the spinning speed is low, on the occasion when the polyethylene-based resin is cooled to achieve solidification (crystallization), its density becomes higher than that of the polypropylene-based resin, and therefore, a difference in a shrinkage ratio from the polypropylene-based resin is generated. In this way, in the case where the difference in a shrinkage ratio between the two components becomes a control factor to undergo crimping of the fiber, the polyethylene-based resin having a higher shrinkage ratio is located inside the crimp.
  • thermoplastic resin (C) the spinnability is improved, and it is possible to increase the spinning speed.
  • the spinning speed is fast, on the occasion when the polypropylene-based resin is cooled to achieve solidification (crystallization), the polypropylene-based resin is crystallized more fast than the polyethylene-based resin, and therefore, a difference in a solidification speed from the polyethylene-based resin is generated.
  • the difference in a shrinkage ratio between the two components becomes a control factor to undergo crimping of the fiber, the polypropylene-based resin having a higher shrinkage ratio is located inside the crimp.
  • Such a phenomenon may exert a strong influence on the case where the resin in a semi-molten state immediately after being discharged from a die forms a crimped fiber.
  • the spinning speed is thoroughly fast, when the polypropylene-based resin is solidified and immobilized in advance of the polyethylene-based resin, the polyethylene-based resin which is in a semi-molten state at that moment is solidified while refaxing, and therefore, there is a possibility that the polyethylene-based resin is located outside the crimp.
  • the spinning speed is slow, only a molecular orientation of a constant value or lower is applied, and therefore, the speed of the original crystallization becomes a control factor.
  • the polyethylene-based resin is located inside the crimp, whereas the polypropylene-based resin is located outside the crimp.
  • the polypropylene-based resin is shrunk due to not only crystallization but also a force at which the molecular chains having been drawn in a tangled state on spinning are released from stretching to return back.
  • the shrinkage ratio becomes high.
  • the control factor at which the fiber crimps changes, whereby the polypropylene-based resin having a higher shrinkage ratio is located inside the crimp.
  • the resin constituting the inside of the crimp in the crimped fiber may be any of the component containing the thermoplastic resin (A), the component composed of the thermoplastic resin (A), the component containing the thermoplastic resin (B), and the component composed of the thermoplastic resin (B).
  • the side-by-side type crimped fiber is produced by the melt spinning method in which the resins of at least two components are each separately melt extruded with an extruder and extruded from special spinning nozzles as disclosed in, for example, U.S. Patent 3,671,379 , and the molten resins each separately melt extruded from the extruder are joined and discharged in a fiber form, followed by cooling for solidification.
  • the spinning speed is fast, the crimping properties of the resulting side-by-side type crimped fiber can be enhanced, and hence, such is preferred.
  • the desired fiber can be produced even without performing a post-treatment step, such as heating or stretching after spinning; however, the post-treatment step may be adopted, if desired.
  • a crimping degree of the fiber may be increased by heating at 100 to 150°C, stretching in a ratio of 1.2 to 5 times, or a combined condition thereof.
  • a fineness as calculated by the following measuring method is preferably 0.5 deniers or more, and more preferably 0.8 deniers or more, and it is preferably 2.5 denies or less, and more preferably 2.0 deniers or less.
  • the fineness of the crimped fiber is calculated by the following measurement method.
  • the number of crimps is preferably 2 or more per 25 mm, more preferably 5 or more per 25 mm, still more preferably 10 or more per 25 mm, yet still more preferably 13 or more per 25 mm, and even yet still more preferably 15 or more per 25 mm.
  • the crimping degree is preferably 1.5% or more, more preferably 3% or more, still more preferably 5% or more, yet still more preferably 7% or more, and even yet still more preferably 9% or more.
  • the number of crimps and the crimping degree can be measured by the methods described in the section of Examples.
  • the nonwoven fabric of the present embodiment includes the aforementioned crimped fiber.
  • the nonwoven fabric is small in terms of the fineness as mentioned above and is excellent in terms of spinning stability even under a forming condition under which end breakage likely occurs.
  • the nonwoven fabric of the present embodiment may also be a multilayered nonwoven fabric including a laminate of two or more layers. In that case, from the viewpoint of smoothness of the surface, it is preferred that at least one layer of the nonwoven fabric constituting an outer layer of the multilayered nonwoven fabric is the nonwoven fabric including the aforementioned crimped fiber.
  • the production method of the nonwoven fabric of the present embodiment is not particularly limited, and a conventionally known method can be adopted. As an example thereof, the spunbonding method is shown below.
  • the spunbonding method a melt-kneaded resin composition is spun, stretched, and then opened to form a continuous long fiber, and subsequently, in the continuing step, the continuous long fiber is deposited on a moving collector surface and entangled to produce a nonwoven fabric.
  • the nonwoven fabric can be continuously produced, and the fibers constituting the nonwoven fabric are a stretched continuous long fiber, and therefore, the strength is high.
  • the spunbonding method a conventionally known method can be adopted, and the fibers can be produced by extruding a molten polymer from, for example, a group of large nozzle having several thousand holes, or for example, a group of small nozzles each having about 40 holes.
  • the molten fiber After being ejected from the nozzle, the molten fiber is cooled by a cross-flow cold air system and then drawn away from the nozzle, followed by stretching by high-speed airflow.
  • air-damping methods there are two kinds of air-damping methods, both of which use a venturi effect.
  • a filament is stretched using a suction slot (slot stretching), and this method is conducted with a width of the nozzle or a width of the machine.
  • a filament is stretched through a nozzle or a suction gun.
  • a filament formed by this method is collected on a screen (wire) or a pore forming belt to form a web.
  • the web passes through compression rolls and then between heating calendar rolls and are bounded at a part where the embossing part on one roll includes about 10% or more and about 40% or less of the area of the web to form a nonwoven fabric.
  • the fiber product using the nonwoven fabric of the present embodiment is not particularly limited, for example, the following fiber products can be exemplified. That is, examples thereof include a member for a disposable diaper, a stretchable member for a diaper cover, a stretchable member for a sanitary product, a stretchable member for a hygienic product, a stretchable tape, an adhesive bandage, a stretchable member for clothing, an insulating material for clothing, a heat insulating material for clothing, a protective suit, a hat, a mask, a glove, a supporter, a stretchable bandage, a base fabric for a fomentation, a non-slip base fabric, a vibration absorber, a finger cot, an air filter for a clean room, an electret filter subjected to electret processing, a separator, a heat insulator, a coffee bag, a food packaging material, a ceiling skin material for an automobile, an acoustic insulating material, a cushioning
  • the half-crystallization time was measured using FLASH DSC (manufactured by Mettler Toledo International Inc.) by the following method.
  • melt flow rate was measured for the thermoplastic resin (A) under a condition at a temperature of 190°C and a load of 2.16 kg and for the thermoplastic resin (B) and the thermoplastic resin (C) under a condition at a temperature of 230°C and a load of 2.16 kg, respectively.
  • a melting endotherm was determined from a melting endothermic curve obtained by holding 10 mg of a sample at -10°C for 5 minutes under a nitrogen atmosphere and then increasing the temperature at a rate of 10°C/min by using a differential scanning calorimeter (DSC-7, manufactured PerkinElmer Inc.).
  • a melting point was determined from a peak top of a peak observed on the highest temperature side of the obtained melting endothermic curve.
  • the melting endotherm ( ⁇ H-D) is calculated in a manner in which when a line connecting a point on the low-temperature side free from a change of the amount of heat with a point on the high-temperature side free from a change of the amount of heat is defined as a baseline, an area surrounded by a line portion including the peak of the melting endothermic curve obtained by the DSC measurement using a differential scanning calorimeter (DSC-7, manufactured PerkinElmer Inc.) and the baseline is determined.
  • DSC-7 differential scanning calorimeter
  • the weight average molecular weight (Mw) and the number average molecular weight (Mn) were measured by the gel permeation chromatography (GPC) method to obtain the molecular weight distribution (Mw/Mn).
  • the following device and condition were used for the measurement to obtain a weight average molecular weight and a number average molecular weight as expressed in terms of polystyrene.
  • the molecular weight distribution (Mw/Mn) is a value calculated from these weight average molecular weight (Mw) and number average molecular weight (Mn).
  • Propylene and hydrogen were continuously supplied at a polymerization temperature of 75°C so as to keep a hydrogen concentration in the vapor phase at 24 mol% and a whole pressure within the reactor at 1.0 MPa ⁇ G, respectively.
  • an antioxidant was added in a content proportion of 1,000 ppm by mass, and the n-heptane as a solvent was then removed to obtain a propylene-based polymer (C1).
  • Propylene and hydrogen were continuously supplied at a polymerization temperature of 65°C so as to keep a hydrogen concentration in the vapor phase at 8 mol% and a whole pressure within the reactor at 1.0 MPa ⁇ G, respectively.
  • an antioxidant was added in a content proportion of 1,000 ppm by mass, and the n-heptane as a solvent was then removed to obtain a propylene-based polymer (C2).
  • the half-crystallization time, the MFR, and the melting point (Tm-D) of each of the ethylene-based resins (A1), (A2), (A3), (A4), (A5), and (A6) as measured by the aforementioned methods are shown in Table 2.
  • Erucamide a trade name: EA-10 Table 2 Unit
  • Ethylene -based resin A1 Ethylene -based resin (A2) Ethylene -based resin (A3) Ethylene -based resin (A4) Ethylene -based resin (A5) Ethylene -based resin (A6) Propylene homopolym er (B1) Propylene homopolym er (B2) Half-crystallization time sec 0.01 or less 0.01 or less 0.01 or less 0.01 or less 0.01 or less 0.01 or less 0.01 or less 0.05 0.05 MFR g/10 min 17 18.5 17 30 30 50 30 35 Melting point (Tm-D) °C 129 120 130 130 98 125 167 166
  • thermoplastic resin (A) Only the ethylene-based resin (A1) was used as the thermoplastic resin (A) to provide the first component.
  • thermoplastic resin (B) 80% by mass of the propylene homopolymer (B1) as the thermoplastic resin (B) and 20% by mass of the propylene-based polymer (C1) obtained in Production Example 1 as the thermoplastic resin (C) were compounded to provide the second component.
  • the formation of a side-by-side type crimped fiber was performed using a conjugate melt fiber spinning machine, bi-component spinning apparatus having two extruders.
  • the first component and the second component were each separately melt extruded with a single-screw extruder at a resin temperature of 240°C, and the molten resin was discharged and spun from a side-by-side composite nozzle having a nozzle diameter of 0.60 mm (number of holes: 1,795 holes) at a rate of 54 kg/h per single hole in a mass ratio of the first component to the second component of 50/50, to obtain a side-by-side type crimped fiber.
  • the resulting side-by-side type crimped fiber was sucked at an ejector pressure of 5.0 kg/cm 2 while cooling with air at a cooling temperature of 12.5°C and at a wind velocity of 0.6 m/sec and collected on a moving net surface.
  • the fiber bundle thus collected on the net surface was embossed by a heat roll heated at a calendar temperature of 110°C/110°C at a line pressure of 40 N/mm and wound up by a take-up roll.
  • a side-by-side type crimped fiber and a nonwoven fabric were obtained in the same manner as in Example 1, except that in Example 1, the first component was changed to a composition composed of 98% by mass of the ethylene-based resin (A1) and 2% by mass of erucamide, and the second component was changed to a composition composed of 78% by mass of the propylene homopolymer (B1), 20% by mass of the propylene-based polymer (C1), and 2% by mass of erucamide.
  • a side-by-side type crimped fiber and a nonwoven fabric were obtained in the same manner as in Example 1, except that in Example 1, the first component was changed from the ethylene-based resin (A1) to the ethylene-based resin (A2), and the ejector pressure and the calendar temperature were changed to 4.5 kg/cm 2 and 100°C/100°C, respectively.
  • a side-by-side type crimped fiber and a nonwoven fabric were obtained in the same manner as in Example 1, except that in Example 1, the second component was changed to a composition composed of 100% by mass of the propylene homopolymer (B1), and the ejector pressure and the calendar temperature were changed to 2.0 kg/cm 2 and 100°C/100°C, respectively.
  • a mass of 20 cm ⁇ 20 cm of the resulting nonwoven fabric was measured to measure a basis weight (gsm).
  • a specimen having a size of 150 mm in length and 50 mm in width was sampled from the resulting nonwoven fabric in each of the machine direction (MD) and the transverse direction (TD) against the machine direction.
  • MD machine direction
  • TD transverse direction
  • the specimen was stretched at a tensile speed of 300 mm/min and measured for a strain and a load in a stretching process, and a maximum strength in a process until the nonwoven fabric was broken was defined as a nonwoven fabric strength.
  • a specimen having a size of 200 mm in length and 200 mm in width was sampled from the resulting nonwoven fabric.
  • the specimen was set on a slit having a width of 1/4 inch such that it was at an angle of 90° to the slit, and the position of 67 mm (1/3 of the specimen width) from the side of the specimen was indented in a proportion of 8 mm by a blade of a penetrator.
  • a resistance value at this time was measured to evaluate flexibility of the specimen.
  • the characteristic feature of this measurement method resides in the matter that the specimen slightly slips on a test bench, and a force in which a frictional force generated and a resistance force (flexibility) at the indentation time are combined together is measured. It is meant that as the value of resistance value obtained by the measurement is small, the flexibility of the nonwoven fabric is favorable.
  • a specimen having a size of 220 mm in length and 100 mm in width and a specimen having a size of 220 mm in length and 70 mm in width were sampled from the resulting nonwoven fabric in each of the machine direction (MD) and the transverse direction (TD) against the machine direction.
  • Two sheets of the nonwoven fabrics were overlaid on a seating of a static friction coefficient measuring device ("friction measuring device AN type", manufactured by Toyo Seiki Kogyo Co., Ltd.); a weight of 1,000 g was placed thereon; the seating was inclined at a rate of 2.7 degrees/min; and an angle when the nonwoven fabrics slipped 10 mm was measured. From the mass (1,000 g) of the placed weight and the angle when the nonwoven fabrics slipped 10 mm, the static friction coefficient was calculated.
  • a specimen having a size of 50 mm in lenght and 50 mm in width was sampled from the resulting nonwoven fabric.
  • Ten sheets of the specimens were superimposed, 1.9 g of a metal plate was placed on the superimposed specimens, and a thickness of the superimposed specimens was measured. It is meant that as the numerical value of the thickness is high, the nonwoven fabric is high in bulkiness.
  • the number of crimps was measured using an automated crimp elastic modulus measuring device according to the measurement method of a number of crimps as prescribed in JIS L1015:2000.
  • One fiber was extracted from a cotton-like sample before embossing in such a manner that a tension was not applied to the fiber; a length when an initial load of 0.18 mN/tex was applied to 25 mm of the sample was measured; and the number of crimps at that time was counted, thereby determining the number of crimps in a length of 25 mm. It is meant that as the number of crimps is large, the fiber-nonwoven fabric is high in the crimping properties.
  • the fiber diameter could be reduced, and the nonwoven fabric composed of the foregoing crimped fiber was bulky, high in crimping properties, and excellent in flexibility and smoothness.
  • thermoplastic resin (A) Only the ethylene-based resin (A3) was used as the thermoplastic resin (A) to provide the first component.
  • thermoplastic resin (B) 80% by mass of the propylene homopolymer (B2) as the thermoplastic resin (B) and 20% by mass of the propylene-based polymer (C1) obtained in Production Example 1 as the thermoplastic resin (C) were compounded to provide the second component.
  • a side-by-side type crimped fiber was obtained by spinning in the same manner as in Example 1, except that the number of holes of the side-by-side composite nozzle was set to 6,800 holes, and the molten resin was discharged at a rate of 265 kg/h per single hole.
  • the resulting side-by-side type crimped fiber was sucked at a cabin pressure of 6,300 Pa while cooling at a cooling temperature of 20°C and collected on a moving net surface.
  • the fiber bundle thus collected on the net surface was embossed by a heat roll heated at a calendar temperature of 140°C/130°C at a line pressure of 60 N/mm and wound up by a take-up roll.
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 4, except that the second component was changed to 100% by mass of the propylene homopolymer (B2).
  • a nonwoven fabric was obtained in the same manner as in Example 4, except that the cabin pressure was changed to 3,400 Pa.
  • Example 4 With respect to the side-by-side type crimped fiber and the nonwoven fabric obtained in each of Example 4 and Comparative Example 2, the aforementioned measurements and evaluations were performed. The results are shown in Table 4. Table 4 Unit Example 4 Comparative Example 2 First component Thermoplastic resin (A) Ethylene-based resin (A1) mass% 0 0 Ethylene-based resin (A3) mass% 100 100 Slip inhibitor Erucamide mass% 0 0 Half-crystallization time of first component sec 0.01 or less 0.01 or less MFR of first component g/10 min 17 17 Melting point (Tm-D) of first component °C 130 130 Second component Thermoplastic resin (B) Propylene homopolymer (B1) mass% 0 0 Propylene homopolymer (B2) mass% 80 100 Thermoplastic resin (C) Propylene-based polymer (C1) mass% 20 0 Slip inhibitor Erucamide mass% 0 0 Half-crystallization time of second component sec 0.09 0.05 MFR of second component
  • the nonwoven fabric composed of the side-by-side type crimped fiber of Example 4 was favorable in flexibility and texture, such as hand touch feeling, as compared with the nonwoven fabric composed of the thermoplastic resin (C)-free side-by-side type crimped fiber of Comparative Example 2.
  • thermoplastic resin (A) Only the ethylene-based resin (A3) was used as the thermoplastic resin (A) to provide the first component.
  • thermoplastic resin (B) 80% by mass of the propylene homopolymer (B2) as the thermoplastic resin (B) and 20% by mass of the propylene-based polymer (C1) obtained in Production Example 1 as the thermoplastic resin (C) were compounded to provide the second component.
  • a side-by-side type crimped fiber was obtained by spinning in the same manner as in Example 1, except that the number of holes of the side-by-side composite nozzle was set to 6,800 holes, and the molten resin was discharged at a rate of 220 kg/h per single hole.
  • the resulting side-by-side type crimped fiber was sucked at a cabin pressure of 6,000 Pa while cooling at a cooling temperature of 20°C and collected on a moving net surface. Subsequently, using three continuing ovens, the ovens were heated under a condition at a temperature of 125°C, 133°C, and 133°C, respectively, and the fiber bundle thus collected on the net surface was partially thermally fusion bonded.
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 5, except that the second component was changed to 100% by mass of the propylene homopolymer (B2).
  • a nonwoven fabric was obtained in the same manner as in Example 5, except that the cabin pressure was changed to 3,400 Pa.
  • the nonwoven fabric composed of the side-by-side type crimped fiber of Example 5 was excellent in flexibility and was able to make the thickness of the nonwoven fabric thick, as compared with the nonwoven fabric composed of the thermoplastic resin (C)-free side-by-side type crimped fiber of Comparative Example 3.
  • thermoplastic resin (A) Only the ethylene-based resin (A4) was used as the thermoplastic resin (A) to provide the first component.
  • thermoplastic resin (B) 80% by mass of the propylene homopolymer (B1) as the thermoplastic resin (B) and 20% by mass of the propylene-based polymer (C1) obtained in Production Example 1 as the thermoplastic resin (C) were compounded to provide the second component.
  • the formation of a side-by-side type crimped fiber was performed using a conjugate melt fiber spinning machine, bi-component spinning apparatus having two extruders.
  • the first component and the second component were each separately melt extruded with a single-screw extruder at a resin temperature of 230°C, and the molten resin was discharged and spun from a side-by-side composite nozzle having a nozzle diameter of 0.60 mm (number of holes: 1,795 holes) at a rate of 43 kg/h per single hole in a mass ratio of the first component to the second component of 50/50, followed by sucking at an ejector pressure of 3.0 kg/cm 2 while cooling with air at a wind velocity of 0.6 m/sec, to obtain a side-by-side type crimped fiber.
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 6, except that in Example 6, the first component was changed from the ethylene-based resin (A4) to the ethylene-based resin (A5), and the ejector pressure was changed to 4.0 kg/cm 2 .
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 6, except that in Example 6, the first component was changed from the ethylene-based resin (A4) to the ethylene-based resin (A6), and the ejector pressure was changed to 2.5 kg/cm 2 .
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 6, except that in Example 6, the first component was changed to a composition composed of 50% by mass of the ethylene-based resin (A1) and the 50% by mass of the ethylene-based resin (A6).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 6, except that in Example 6, the first component was changed from the ethylene-based resin (A4) to the ethylene-based resin (A1), the second component was changed to a composition composed of 95% by mass of the propylene homopolymer (B1) and 5% by mass of the propylene-based polymer (C2) obtained in Production Example 2 as the thermoplastic resin (C), and the ejector pressure was changed to 2.0 kg/cm 2 .
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 10, except that in Example 10, the second component was changed to a composition composed of 90% by mass of the propylene homopolymer (B1) and 10% by mass of the propylene-based polymer (C2).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 10, except that in Example 10, the second component was changed to a composition composed of 80% by mass of the propylene homopolymer (B1) and 20% by mass of the propylene-based polymer (C2).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 12, except that in Example 12, the mass ratio of the first component to the second component was changed to 30/70, and the ejector pressure was changed to 2.5 kg/cm 2 .
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 10, except that in Example 10, the second component was changed to a composition composed of 95% by mass of the propylene homopolymer (B1) and 5% by mass of the propylene-based polymer (C1), and the ejector pressure was changed to 2.5 kg/cm 2 .
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 14, except that in Example 14, the second component was changed to a composition composed of 90% by mass of the propylene homopolymer (B1) and 10% by mass of the propylene-based polymer (C1).
  • thermoplastic resin (A) Only the ethylene-based resin (A6) was used as the thermoplastic resin (A) to provide the first component.
  • the formation of a side-by-side type crimped fiber was performed using a conjugate melt fiber spinning machine, bi-component spinning apparatus having two extruders.
  • the first component and the second component were each separately melt extruded with a single-screw extruder at a resin temperature of 230°C, and the molten resin was discharged from a side-by-side composite nozzle having a nozzle diameter of 0.60 mm (number of holes: 1,795 holes) at a rate of 43 kg/h per single hole in a mass ratio of the first component to the second component of 50/50.
  • spinning could not be performed.
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 9, except that in Example 9, the second component was changed to a composition composed of 100% by mass of the propylene homopolymer (B1), and the ejector pressure was changed to 1.5 kg/cm 2 .
  • the side-by-side type crimped fiber placed on a glass slide was immobilized with a rapid non-aqueous mounting medium (Entellan, manufactured by Merck) and then covered by a cover glass, followed by observation.
  • a rapid non-aqueous mounting medium Entellan, manufactured by Merck
  • the fiber was observed in a darkfield inspection mode at an observation magnification of 200 times.
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 1, except that in Example 1, the second component was changed to a composition composed of 79.5% by mass of the propylene homopolymer (B1), 20% by mass of the propylene-based polymer (C1) obtained in Production Example 1 as the thermoplastic resin (C), and 0.5% by mass of a Phthalocyanine Blue masterbatch (propylene-based compound, MFR: 48 g/10 min), and the ejector pressure was changed to 3.0 kg/cm 2 . In order to confirm the crimping direction, the resulting crimped fiber was observed with an optical microscope.
  • the outside of the crimped fiber was the first component containing the ethylene-based resin (A1)
  • the inside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1) (see Fig. 1 ).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 16, except that in Example 16, the ejector pressure was changed to 2.5 kg/cm 2 .
  • the crimping direction of the resulting crimped fiber was confirmed.
  • the outside of the crimped fiber was the first component containing the ethylene-based resin (A1)
  • the inside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1) (see Fig. 2 ).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 16, except that in Example 16, the ejector pressure was changed to 2.0 kg/cm 2 .
  • the crimping direction of the resulting crimped fiber was confirmed.
  • the outside of the crimped fiber was the first component containing the ethylene-based resin (A1)
  • the inside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1) (see Fig. 3 ).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 16, except that in Example 16, the ejector pressure was changed to 1.5 kg/cm 2 .
  • the crimping direction of the resulting crimped fiber was confirmed.
  • the outside of the crimped fiber was the first component containing the ethylene-based resin (A1)
  • the inside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1) (see Fig. 4 ).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 16, except that in Example 16, the ejector pressure was changed to 1.0 kg/cm 2 .
  • the crimping direction of the resulting crimped fiber was confirmed.
  • the outside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1), and the inside of the crimped fiber was the first component containing the ethylene-based resin (A1) (see Fig. 5 ).
  • a side-by-side type crimped fiber was obtained in the same manner as in Example 16, except that in Example 16, the ejector pressure was changed to 0.5 kg/cm 2 .
  • the crimping direction of the resulting crimped fiber was confirmed.
  • the outside of the crimped fiber was the second component containing the propylene homopolymer (B1) and the propylene-based polymer (C1), and the inside of the crimped fiber was the first component containing the ethylene-based resin (A1) (see Fig. 6 ).
  • Figs. 1 to 6 images when observed with the optical microscope (magnification: 200 times) are shown in Figs. 1 to 6 , respectively.
  • the side containing the particle component was the side of the second component having the Phthalocyanine Blue masterbatch added thereto, and as for the curve of the crimped fiber, the inside and the outside were reversed depending upon the difference in the ejector pressure. From this fact, when the crimping components of the inside and the outside of the fiber are altered, a nonwoven fabric which is excellent in terms of a texture and a balance between flexibility and strength can be expected.

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JP6618002B2 (ja) * 2014-03-20 2019-12-11 出光興産株式会社 捲縮繊維及び不織布
JP6521963B2 (ja) * 2014-07-03 2019-05-29 出光興産株式会社 スパンボンド不織布及びその製造方法
US10130923B2 (en) * 2014-11-14 2018-11-20 Idemitsu Kosan Co., Ltd. Method for stirring resin pellets

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EP3626869C0 (en) 2024-04-24
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