WO2020095947A1 - Tissu non-tissé, et procédé de fabrication de celui-ci - Google Patents

Tissu non-tissé, et procédé de fabrication de celui-ci Download PDF

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Publication number
WO2020095947A1
WO2020095947A1 PCT/JP2019/043499 JP2019043499W WO2020095947A1 WO 2020095947 A1 WO2020095947 A1 WO 2020095947A1 JP 2019043499 W JP2019043499 W JP 2019043499W WO 2020095947 A1 WO2020095947 A1 WO 2020095947A1
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Prior art keywords
less
mass
nonwoven fabric
fiber
minutes
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PCT/JP2019/043499
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English (en)
Japanese (ja)
Inventor
真理 矢部
拓実 杉内
匡貴 岡野
南　裕
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出光興産株式会社
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Publication of WO2020095947A1 publication Critical patent/WO2020095947A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • 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
    • 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
    • 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
    • D04H3/16—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 filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the present invention relates to a nonwoven fabric and a method for manufacturing the same.
  • Patent Document 1 contains a highly crystalline polyolefin that satisfies a specific condition and a low crystalline polyolefin for the purpose of thinning the fibers that form the nonwoven fabric while maintaining the spinning stability.
  • a fibrous nonwoven fabric made of a resin composition is disclosed.
  • Patent Document 1 may not be able to obtain a sufficiently bulky nonwoven fabric.
  • the problem to be solved by the present invention is to provide a sufficiently bulky nonwoven fabric.
  • the present disclosure relates to the following. ⁇ 1> 10% by mass or more and 99% by mass or less of a propylene homopolymer (A) having a melting point (Tm-D) measured by a differential scanning calorimeter (DSC) of more than 120 ° C., a differential scanning calorimeter (DSC)
  • the melting point (Tm-D) measured by the method (1) is 1% by mass or more and 90% by mass or less of the polypropylene resin (B) having a melting point (Tm-D) of 120 ° C.
  • the propylene homopolymer (A) has a melt flow rate (MFR) at 230 ° C. of 5 g / 10 minutes or more and 100 g / 10 minutes or less.
  • ⁇ 4> In any one of the above items ⁇ 1> to ⁇ 3>, wherein the polypropylene resin (B) has a melt flow rate (MFR) at 230 ° C. of 5 g / 10 minutes or more and 5,000 g / 10 minutes or less.
  • MFR melt flow rate
  • the polypropylene resin (B) has a melting endotherm ( ⁇ HD) measured by a differential scanning calorimeter (DSC) of 0 J / g or more and 80 J / g or less, ⁇ 1> to ⁇ 4>>
  • the non-woven fabric according to any one of ⁇ 6> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 5>, wherein the polypropylene resin (B) has a molecular weight distribution (Mw / Mn) of 1.5 or more and 3.5 or less.
  • Mw / Mn molecular weight distribution
  • ⁇ 8> The non-woven fabric according to any one of ⁇ 1> to ⁇ 7>, further including a polyethylene resin (C).
  • C polyethylene resin
  • ⁇ 9> The nonwoven fabric according to ⁇ 8>, wherein the polyethylene resin (C) has a melt flow rate (MFR) at 190 ° C. of 10 g / 10 minutes or more and 50 g / 10 minutes or less.
  • MFR melt flow rate
  • ⁇ 10> 10% by mass or more and 99% by mass or less of a propylene homopolymer (A) having a melting point (Tm-D) measured by a differential scanning calorimeter (DSC) of more than 120 ° C., a differential scanning calorimeter (DSC) ), A melting point (Tm-D) of 120 °C or less polypropylene resin (B) 1 mass% to 90 mass% of fibers containing a step of fusing with a hot air knife .. ⁇ 11> The method for producing a nonwoven fabric according to ⁇ 10> above, which does not use a compression roll.
  • a sufficiently bulky nonwoven fabric can be provided.
  • a to B relating to the description of numerical values means “A or more and B or less” (when A ⁇ B) or “A or less and B or more” (when A> B). ..
  • a combination of preferable modes is a more preferable mode.
  • the nonwoven fabric of the present embodiment has a propylene homopolymer (A) having a melting point (Tm-D) of more than 120 ° C. measured by a differential scanning calorimeter (DSC) of 10% by mass or more and 99% by mass or less, and a differential scanning type. 1 mass% or more and 90 mass% or less of a polypropylene resin (B) having a melting point (Tm-D) of 120 ° C. or less measured by a calorimeter (DSC), and a thickness / basis weight of 25 cm 3 / g or more 100 cm 3 / The tensile strength in the CD direction is 5 N / 5 cm or more.
  • the melting point (Tm-D) of the propylene homopolymer (A) exceeds 120 ° C. When the melting point (Tm-D) is 120 ° C. or lower, the strength of the fiber may be insufficient. From this point of view, the melting point (Tm-D) of the propylene homopolymer (A) is preferably 125 ° C. or higher, more preferably 130 ° C. or higher, still more preferably 135 ° C. or higher.
  • the upper limit is not particularly limited, but is preferably 180 ° C or lower.
  • the melting point (Tm-D) of the propylene homopolymer (A) is maintained at -10 ° C for 5 minutes in a nitrogen atmosphere using a differential scanning calorimeter (DSC) and then raised at 10 ° C / minute. It is defined as the peak top of the peak observed on the highest temperature side of the melting endothermic curve obtained.
  • the melt flow rate (MFR) of the propylene homopolymer (A) is preferably 5 g / 10 minutes or more, more preferably 7 g / 10 minutes or more, further preferably 10 g / 10 minutes or more, particularly preferably 20 g / 10 minutes or more. And is preferably 100 g / 10 minutes or less, more preferably 75 g / 10 minutes or less, still more preferably 50 g / 10 minutes or less. If the MFR is 5 g / 10 minutes or more, the spinnability will be better, and if it is 100 g / 10 minutes or less, the strength of the fiber can be further improved.
  • the melt flow rate (MFR) of the propylene homopolymer (A) is measured by the measuring method specified in JIS K7210, and the temperature is 230 ° C and the load is 2.16 kg.
  • the half-crystallization time of the propylene homopolymer (A) at 25 ° C is preferably more than 0.01 seconds, more preferably 0.02 seconds or more, still more preferably 0.03 seconds or more, still more preferably 0. It is 04 seconds or more, and preferably 0.06 seconds or less, more preferably 0.05 seconds or less.
  • the half-crystallization time of the propylene homopolymer (A) at 25 ° C. exceeds 0.01 seconds, a difference from the half-crystallization time of the polypropylene resin (B) at 25 ° C. occurs, and the side-by-side crimped fiber The crimpability can be improved.
  • the half crystallization time was measured by the following method. Using a FLASH DSC (manufactured by METTLER TOLEDO Co., Ltd.), the sample was heated at 230 ° C. for 2 minutes to be melted, then cooled to 25 ° C. at 2,000 ° C./sec, and subjected to an isothermal crystallization process at 25 ° C. , Measure the change in heat generation over time. When the integrated value of the calorific value from the start of the isothermal crystallization to the completion of the crystallization is 100%, the time from the start of the isothermal crystallization to the integrated value of the calorific value of 50% is the half crystallization time. ..
  • the content of the propylene homopolymer (A) in the nonwoven fabric is preferably 10% by mass or more, more preferably 75% by mass or more, further preferably 80% by mass or more, from the viewpoint of fiber spinnability, and It is preferably 99% by mass or less, more preferably 97% by mass or less, and further preferably 95% by mass or less.
  • the content of the propylene homopolymer (A) in the total 100% by mass of the propylene homopolymer (A) and the polypropylene resin (B) in the nonwoven fabric is preferably 10 from the viewpoint of fiber spinnability. It is at least mass%, more preferably at least 60 mass%, further preferably at least 70 mass%, and preferably at most 99 mass%, more preferably at most 95 mass%.
  • the polypropylene resin (B) has a melting point (Tm-D) of 120 ° C. or lower, preferably 100 ° C. or lower, more preferably 90 ° C. or lower, and preferably 0 ° C. or higher, from the viewpoint of improving the spinnability of the fiber. , More preferably 30 ° C. or higher, still more preferably 60 ° C. or higher.
  • the melting point (Tm-D) of the polypropylene resin (B) is measured in the same manner as the melting point (Tm-D) of the propylene homopolymer (A).
  • the polypropylene resin (B) is a melting endothermic curve obtained by using a differential scanning calorimeter (DSC), holding the sample in a nitrogen atmosphere at ⁇ 10 ° C. for 5 minutes, and then raising the temperature at 10 ° C./minute. It is preferable that the melting endotherm ( ⁇ HD) obtained from the above is 0 J / g or more and 80 J / g or less. Within the range, the spinnability of the fiber can be improved.
  • DSC differential scanning calorimeter
  • the melting endotherm ( ⁇ HD) is preferably 20 J / g or more, more preferably 25 J / g or more, further preferably 27 J / g or more, particularly preferably 30 J / g or more, and It is preferably 50 J / g or less, more preferably 45 J / g or less, still more preferably 40 J / g or less. If the melting endotherm is 20 J / g or more, stickiness is further suppressed.
  • the melting endotherm ( ⁇ HD) is the highest temperature of the melting endothermic curve obtained by DSC measurement, with the line connecting the low temperature side where the calorific value does not change and the high temperature side where the calorific value does not change as the baseline. It is calculated by obtaining the area surrounded by the line portion including the peak observed on the side and the baseline.
  • the melting endotherm ( ⁇ HD) can be controlled by appropriately adjusting the monomer concentration and reaction pressure.
  • the melt flow rate (MFR) of the polypropylene resin (B) is preferably 5 g / 10 minutes or more, more preferably 30 g / 10 minutes or more, further preferably 100 g / 10 minutes or more, from the viewpoint of improving the spinnability of the fiber. It is particularly preferably 1,000 g / 10 minutes or more, and preferably 5,000 g / 10 minutes or less, more preferably 4,000 g / 10 minutes or less, and further preferably 3,000 g / 10 minutes or less. If the MFR is 5 g / 10 minutes or more, the spinnability is better, and if it is 5,000 g / 10 minutes or less, the strength of the fiber can be further improved.
  • the melt flow rate (MFR) of the polypropylene resin (B) is measured by the measuring method specified in JIS K7210, and the temperature is 230 ° C. and the load is 2.16 kg.
  • the weight average molecular weight (Mw) of the polypropylene resin (B) is preferably 30,000 or more, more preferably 35,000 or more, still more preferably 40,000 or more, from the viewpoint of improving the spinnability of the fiber. It is preferably 200,000 or less, more preferably 150,000 or less, still more preferably 100,000 or less.
  • the molecular weight distribution (Mw / Mn) of the polypropylene resin (B) is preferably 1.5 or more, more preferably 1.8 or more, and preferably 3.5 or less, more preferably 3.0 or less, More preferably, it is 2.5 or less.
  • Mw / Mn The molecular weight distribution of the polypropylene resin (B) is within the range, the occurrence of stickiness in the fiber obtained by spinning is suppressed.
  • the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) are determined by gel permeation chromatography (GPC) measurement.
  • the weight average molecular weight is a polystyrene-equivalent weight average molecular weight measured by the following apparatus and conditions, and the molecular weight distribution is a value calculated from the number average molecular weight (Mn) similarly measured and the above weight average molecular weight.
  • ⁇ GPC measuring device Column: "TOSO GMHHR-H (S) HT” manufactured by Tosoh Corporation Detector: RI detection for liquid chromatogram "WATERS 150C” manufactured by Waters Corporation ⁇ Measurement conditions> Solvent: 1,2,4-trichlorobenzene Measurement temperature: 145 ° C Flow rate: 1.0 mL / min Sample concentration: 2.2 mg / mL Injection volume: 160 ⁇ L Calibration curve : Universal Calibration Analysis program: HT-GPC (Ver.1.0)
  • the polypropylene resin (B) is not particularly limited as long as the melting point (Tm-D) is within the above range, and may be a propylene homopolymer or a copolymer. Among them, propylene homopolymer is preferable.
  • the copolymerization ratio of propylene units exceeds 50 mol%, preferably 60 mol% or more, more preferably 70 mol% or more, further preferably 90 mol% or more. , And more preferably 95 mol% or more.
  • the copolymerizable monomer is at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 30 carbon atoms, and specific examples include ethylene, 1-butene, 1-pentene, 1-hexene, Examples include 1-octene and 1-decene.
  • the polypropylene resin (B) is a copolymer
  • the polypropylene resin (B) contains 0 mol% of at least one constitutional unit selected from the group consisting of ethylene and ⁇ -olefins having 4 to 30 carbon atoms. It is preferable that the content exceeds 20 mol% or less.
  • the half-crystallization time of the polypropylene resin (B) at 25 ° C is preferably longer than 0.06 seconds.
  • the half-crystallization time of the polypropylene resin (B) at 25 ° C. exceeds 0.06 seconds, a difference from the half-crystallization time of the propylene homopolymer (A) at 25 ° C. occurs, and the side-by-side crimped fiber is obtained. The crimpability of can be further improved.
  • the half crystallization time of the polypropylene resin (B) is measured in the same manner as the half crystallization time of the propylene homopolymer (A).
  • the polypropylene resin (B) is preferably produced using a metallocene catalyst in order to satisfy the above-mentioned molecular weight distribution (Mw / Mn).
  • a metallocene-based catalyst as described in WO 2003/087172 can be used.
  • a metallocene catalyst obtained by combining a cocatalyst is preferable.
  • the content of the polypropylene resin (B) in the non-woven fabric is preferably 1% by mass or more, more preferably 3% by mass or more, further preferably 5% by mass or more, and preferably from the viewpoint of spinnability of the fibers. Is 90% by mass or less, more preferably 25% by mass or less, and further preferably 20% by mass or less.
  • the content of the polypropylene resin (B) in the total 100% by mass of the propylene homopolymer (A) and the polypropylene resin (B) in the nonwoven fabric is preferably 1 mass from the viewpoint of fiber spinnability. % Or more, more preferably 5% by mass or more, and preferably 90% by mass or less, more preferably 40% by mass or less, further preferably 30% by mass or less.
  • the fibers constituting the nonwoven fabric of the present embodiment are not particularly limited, and include side-by-side type fibers, core-sheath type fibers, eccentric core-sheath type fibers, etc., but side-by-side type fibers are preferable. Further, it may be crimped fibers, and examples thereof include side-by-side type crimped fibers, core-sheath type crimped fibers, and eccentric core-sheath type crimped fibers.
  • crimped fiber is used to include a composite spun fiber made by a side-by-side nozzle, an eccentric core-sheath nozzle, a deformed nozzle, or a split nozzle in which different thermoplastic resins are combined.
  • the core-sheath type fiber refers to a fiber whose cross section has a "core" of the inner layer part and a "sheath" of the outer layer part
  • the eccentric core-sheath type fiber is the center of gravity position of the inner layer part in its cross-sectional shape. Means a fiber different from the position of the center of gravity of the whole fiber.
  • first component one component constituting the side-by-side type fiber
  • second component one component constituting the core-sheath type fiber
  • first component one component constituting the side-by-side type fiber
  • second component the other component
  • second component one of the component used for the core portion and the component used for the sheath portion of the core-sheath type fiber
  • first component the component used for the core portion and the component used for the sheath portion of the core-sheath type fiber
  • second component one of the component used for the sheath portion of the core-sheath type fiber
  • the nonwoven fabric of the present embodiment contains fibers made of a resin composition containing 50% by mass or more and 99% by mass or less of a propylene homopolymer (A) and 1% by mass or more and 50% by mass or less of a polypropylene resin (B). Preferably.
  • the first component of the fibers is a propylene homopolymer ( A fiber made of a resin composition containing 50% by mass or more and 99% by mass or less of A) and 1% by mass or more and 50% by mass or less of the polypropylene resin (B) is preferable.
  • the non-woven fabric of the present embodiment contains fibers other than the fiber made of a resin composition containing 50% by mass or more and 99% by mass or less of the propylene homopolymer (A) and 1% by mass or more and 50% by mass or less of the polypropylene resin (B). May be included.
  • the nonwoven fabric of the present embodiment may further contain a polyethylene resin (C).
  • the polyethylene resin (C) is not particularly limited, but is preferably a polyethylene resin using a so-called metallocene catalyst having a narrow molecular weight distribution.
  • the polyethylene resin may be an ethylene homopolymer or a copolymer. When it is a copolymer, the copolymerization ratio of ethylene units exceeds 50 mol%, preferably 60 mol% or more, more preferably 70 mol% or more, further preferably 90 mol% or more, even more preferably 95 mol%. That is all.
  • the 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, 1-decene and the like.
  • the semi-crystallization time of the polyethylene resin (C) is preferably 0.01 seconds or less from the viewpoint of enhancing the crimpability of the fiber.
  • the half-crystallization time of the polyethylene resin (C) at 25 ° C. is 0.01 second or less, crimped fibers having higher crimpability can be obtained.
  • the melt flow rate (MFR) of the polyethylene resin (C) is preferably 10 g / 10 minutes or more, more preferably 15 g / 10 minutes or more, further preferably 20 g / 10 minutes or more, from the viewpoint of enhancing the crimpability of the fiber. And is preferably 50 g / 10 minutes or less, more preferably 45 g / 10 minutes or less, still more preferably 40 g / 10 minutes or less.
  • the melt flow rate (MFR) of the polyethylene-based resin (C) is measured by the measuring method specified in JIS K7210, and the temperature is 190 ° C. and the load is 2.16 kg.
  • the melting point of the polyethylene resin (C) is preferably 90 ° C. or higher, more preferably 100 ° C. or higher, further preferably 115 ° C. or higher, and preferably 140 ° C. or lower, from the viewpoint of enhancing the crimpability of the fiber. More preferably, it is 135 ° C. or lower.
  • the melting point (Tm-D) of the polyethylene resin (C) is measured in the same manner as the melting point (Tm-D) of the propylene homopolymer (A).
  • ethylene homopolymers examples include “ASPUN TM " series (for example, “ASPUN 6850” and “ASPUN 6834”) (manufactured by Dow Chemical Co.).
  • commercially available copolymers of ethylene and octene include "Affinity GA1900”, “Affinity GA1950”, “Affinity EG8185”, “Affinity EG8200”, “Engage 8137” and “Engage 8180” manufactured by Dow Chemical Company. , “Engage 8400”, etc. (all are trade names).
  • the first component of the fibers is a propylene homopolymer
  • the fiber is preferably a resin composition containing 50% by mass or more and 99% by mass or less of A) and 1% by mass or more and 50% by mass or less of the polypropylene resin (B), and the second component of the fiber is a polyethylene resin.
  • a fiber containing (C) is preferable.
  • the content of the polyethylene resin (C) in the second component is preferably 80% by mass or more, more preferably 85% by mass or more, further preferably 90% by mass or more, when the second component is 100% by mass.
  • the upper limit value is 100% by mass.
  • the mass ratio with the components (first component / second component) is preferably 1/9 to 9/1, more preferably 3/7 to 7/3.
  • the mass ratio of the first component and the second component is within the above range, the crimped nonwoven fabric exhibits crimpability and extensibility.
  • the nonwoven fabric of the present embodiment may contain any additive as long as the effect of the present invention is not impaired.
  • the fiber constituting the nonwoven fabric of the present embodiment is at least one selected from the group consisting of side-by-side type fiber, core-sheath type fiber and eccentric core-sheath type fiber, at least the first component and the second component of the fiber
  • One may contain an additive.
  • additives include foaming agents, crystal nucleating agents, weathering stabilizers, UV absorbers, light stabilizers, heat resistance stabilizers, antistatic agents, mold release agents, flame retardants, synthetic oils, waxes, and electrical properties.
  • the fineness (fiber diameter) of the fibers constituting the nonwoven fabric of the present embodiment is preferably 1.8 denier or less, more preferably 1.6 denier or less, further preferably 1.4 denier or less from the viewpoint of the feel of the nonwoven fabric.
  • the lower limit of the fiber diameter is not particularly limited, but is preferably 0.5 denier or more, more preferably 0.6 denier or more, still more preferably 0.7 denier or more, from the viewpoint of ease of production.
  • the non-woven fabric of this embodiment may be a multi-layer non-woven fabric formed by laminating two or more layers. In that case, from the viewpoint of the smoothness of the surface, it is preferable that at least one layer of the nonwoven fabric constituting the outer layer of the multilayer nonwoven fabric is the above-mentioned fiber.
  • the bulkiness of the nonwoven fabric of the present embodiment is preferably 500 ⁇ m or more, more preferably 550 ⁇ m or more, still more preferably 600 ⁇ m or more, and the larger the value, the more preferable.
  • the bulkiness of the non-woven fabric is determined by stacking ten non-woven fabric test pieces each having a length of 50 mm and a width of 50 mm, placing a 1.9 g metal plate thereon, and measuring the thickness of the stacked test pieces. I asked for.
  • the nonwoven fabric of the present embodiment has a thickness / unit weight of 25 cm 3 / g or more, preferably 30 cm 3 / g or more, and the larger the value, the more preferable.
  • the upper limit value is 100 cm 3 / g or less from the viewpoint of ease of manufacturing.
  • the value of the thickness / area weight is obtained from the value of the bulkiness of the nonwoven fabric measured by the above method and the value of the area weight of the nonwoven fabric.
  • the nonwoven fabric of the present embodiment has a tensile strength in the direction perpendicular to the machine direction (MD) (CD) of 5 N / 5 cm or more, preferably 6 N / cm or more, more preferably 7 N / cm or more, and further preferably Is 10 N / cm or more, and the larger the value, the more preferable.
  • the tensile strength in the CD direction is measured by the method described in Examples described later.
  • the propylene homopolymer (A) having a melting point (Tm-D) measured by a differential scanning calorimeter (DSC) of more than 120 ° C. is 50% by mass or more and 99% by mass or less
  • DSC differential scanning calorimeter
  • the melt-kneaded resin composition is spun, stretched, to form continuous filaments by opening, and continuous filaments are deposited on the moving collection surface in a continuous process, A non-woven fabric is manufactured by entanglement.
  • a non-woven fabric can be continuously produced, and since the fibers constituting the non-woven fabric are continuous continuous fibers, the strength is high.
  • fibers can be produced by extruding a molten polymer from a large nozzle having thousands of holes or a small nozzle group having holes of about 40, for example. After exiting the nozzle, the molten fiber is cooled by a cross-flow cold air system, then pulled away from the nozzle and drawn with high velocity air.
  • the first method is to draw the filaments using a suction slot (slot drawing), nozzle width or machine width.
  • the second method draws the filament through a nozzle or a suction gun.
  • the filaments formed in this way are collected on a screen (wire) or on a pore forming belt to form a web.
  • hot air is applied to the obtained web using a hot air knife to fuse the fibers.
  • the hot air knife is a device that blows out hot air from a slit of a certain width. Immediately after collecting the fibers obtained above on the moving net surface, the hot air blown from the hot air knife is applied to the fibers to fuse them together.
  • the hot air temperature is preferably 120 to 150 ° C.
  • the hot air pressure is preferably 1,000 to 2,500 Pa.
  • the web obtained by collecting the fibers is not passed through a compression roll (compression roll). That is, in the method for manufacturing the nonwoven fabric of the present embodiment, it is preferable not to use the compression roll.
  • the fiber bundle is passed between heating calender rolls, and the raised portion on one roll is a portion including an area of 10% or more and 40% or less of the web. It is preferred that they are combined to form a nonwoven fabric.
  • the method for manufacturing a nonwoven fabric of this embodiment can be applied to the manufacture of a nonwoven fabric composed of crimped fibers.
  • An example of the method for producing the side-by-side crimped fiber is shown below.
  • the side-by-side type crimped fiber is obtained by melt-extruding at least two resin components using separate extruders, and using a special spinneret as disclosed in, for example, US Pat. No. 3,671,379. It is produced by a melt spinning method in which molten resins extruded and melt-extruded from different extruders are combined and discharged to form a fiber, which is then cooled and solidified.
  • a desired fiber can be produced without a post-treatment step such as heating and drawing after spinning, but if necessary, post-treatment A step may be adopted, and for example, the crimping rate of the fiber may be increased by heating at 100 to 150 ° C., stretching at 1.2 to 5 times, or a combination thereof.
  • the fiber product using the nonwoven fabric of the present embodiment is not particularly limited, but the following fiber products can be given as examples. That is, members for disposable diapers, elastic members for diaper covers, elastic members for sanitary products, elastic members for hygiene products, elastic tapes, bandages, elastic members for clothing, insulating materials for clothing, heat insulating materials for clothing, Protective clothing, hats, masks, gloves, supporters, elastic bandages, base fabrics for poultices, anti-slip fabrics, vibration absorbers, finger cots, air filters for clean rooms, electret filters with electret processing, separators, and heat insulating materials.
  • Coffee bags food packaging materials, automobile ceiling skin materials, soundproofing materials, cushioning materials, speaker dustproof materials, air cleaner materials, insulator skins, backing materials, adhesive non-woven fabric sheets, door trim and other various automotive parts, and copying machine cleaning.
  • cleaning materials such as wood, front and back materials for carpets, agricultural cloth, wood drain Shoes for members, bag for members such as sports shoes skin, industrial sealing material, mention may be made of the wiping material and sheets or the like.
  • MFR Melt flow rate
  • the melting endotherm is a differential scanning calorimeter (manufactured by Perkin-Elmer Co., Ltd.) with a line connecting the low temperature side point where the calorific value does not change and the high temperature side point where the calorific value does not change as a baseline. , "DSC-7"), and the area surrounded by the line portion including the peak of the melting endothermic curve obtained by the DSC measurement and the baseline is calculated.
  • ⁇ GPC measuring device Column: "TOSO GMHHR-H (S) HT” manufactured by Tosoh Corporation Detector: RI detection for liquid chromatogram "WATERS 150C” manufactured by Waters Corporation ⁇ Measurement conditions> Solvent: 1,2,4-trichlorobenzene Measurement temperature: 145 ° C Flow rate: 1.0 mL / min Sample concentration: 2.2 mg / mL Injection volume: 160 ⁇ L Calibration curve : Universal Calibration Analysis program: HT-GPC (Ver.1.0)
  • Table 2 shows the half-crystallization time, MFR and melting point (Tm-D) of the propylene homopolymer (A1) and the polyethylene resin (C1) measured by the above method.
  • thermoplastic resin composition was obtained by kneading 78 mass% of a propylene homopolymer (A1), 20 mass% of a propylene polymer (B1), and 2 mass% of erucic acid amide as an antislip agent.
  • thermoplastic resin composition was obtained by kneading 98 mass% of propylene homopolymer (A1) and 2 mass% of erucic acid amide as an antislip agent.
  • the molding of the side-by-side type fiber was carried out using a composite melt spinning machine bi-component spinning machine having two extruders.
  • the first component and the second component are melt-extruded at a resin temperature of 240 ° C. by using separate single-screw extruders, and 265 kg / nozzle per nozzle from a side-by-side composite nozzle (hole number 6800 holes) having a nozzle diameter of 0.60 mm.
  • the molten resin was discharged at a discharge amount of h so that the mass ratio of the first component: the second component was 70:30, and spun to obtain a side-by-side crimped fiber.
  • the obtained fiber is sucked with a cabin pressure of 6,500 Pa and collected on a moving net surface, and immediately after that, hot air of 140 ° C. is blown with a hot air knife (manufactured by Rycofil Co., Ltd.) of 1,900 Pa.
  • the fiber bundle collected on the net surface was embossed with a heat roll having a calendering temperature of 143 ° C./135° C. at a linear pressure of 60 N / mm and a line speed of 205 m / min, and wound on a take-up roll.
  • thermoplastic resin composition was obtained by kneading 93 mass% of a propylene homopolymer (A1), 5 mass% of a propylene polymer (B2), and 2 mass% of erucic acid amide as an antislip agent.
  • the first component and the second component are melt-extruded at a resin temperature of 240 ° C. by using separate single-screw extruders, and 265 kg / nozzle per nozzle from a side-by-side composite nozzle (hole number 6800 holes) having a nozzle diameter of 0.60 mm.
  • the molten resin was discharged at a discharge amount of h so that the mass ratio of the first component: the second component was 50:50 and spun to obtain a side-by-side crimped fiber.
  • the obtained fiber was sucked with a cabin pressure of 5,500 Pa and collected on the moving net surface.
  • the fiber bundle collected on the net surface was embossed with a heat roll having a calender temperature of 131 ° C / 126 ° C at a linear pressure of 60 N / mm and a line speed of 278 m / min, and wound on a take-up roll.
  • thermoplastic resin composition was obtained by kneading 80% by mass of the propylene homopolymer (A1) and 20% by mass of the propylene polymer (B2).
  • the first component and the second component are melt-extruded using a separate single-screw extruder at a resin temperature of 240 ° C., and a side-by-side compound nozzle having a nozzle diameter of 0.60 mm (holes of 6800 holes) is used to discharge 220 kg / nozzle.
  • the molten resin was discharged at a discharge amount of h so that the mass ratio of the first component: the second component was 20:80 and spun to obtain a side-by-side crimped fiber.
  • the obtained fiber was sucked with a cabin pressure of 6,000 Pa and collected on a moving net surface, and immediately after that, hot air of 135 ° C. was blown with 1,920 Pa of hot air using a hot air knife (manufactured by Lycofil). The pressure applied to the fiber.
  • the fiber bundle collected on the net surface was embossed with a heat roll having a calendar temperature of 135 ° C./130° C. at a linear pressure of 60 N / mm and a line speed of 163 m / min, and wound on a take-up roll.
  • a test piece having a length of 50 mm and a width of 50 mm was sampled from the obtained nonwoven fabric. Ten of the test pieces were stacked, a 1.9 g metal plate was placed on the stacked test pieces, and the thickness of the stacked test pieces was measured. The higher the numerical value of the thickness, the more bulky the nonwoven fabric is.
  • Example 1 As is clear from the comparison between Example 1 and Comparative Example 1, according to the present invention, a sufficiently bulky nonwoven fabric can be provided. Further, as is clear from Example 2, according to the present invention, a sufficiently bulky nonwoven fabric can be provided even with crimped fibers.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Artificial Filaments (AREA)
  • Multicomponent Fibers (AREA)

Abstract

L'invention concerne un tissu non-tissé qui contient : 10% en masse ou plus à 99% en masse ou moins d'un homopolymère de propylène (A) de point de fusion （Ｔｍ－Ｄ）mesuré par calorimètre à compensation de puissance (DSC) supérieur à 120°C ; et 1% en masse ou plus à 90% en masse ou moins d'une résine à base de polypropylène (B) de point de fusion （Ｔｍ－Ｄ）mesuré par calorimètre à compensation de puissance (DSC) inférieur ou égal à 120°C . Le rapport épaisseur / masse surfacique est supérieur ou égal à ２５ｃｍ3／ｇ et inférieur ou égal à １００ｃｍ3／ｇ, et la résistance à la traction dans une direction CD est supérieure ou égale à ５Ｎ／５ｃｍ.
PCT/JP2019/043499 2018-11-09 2019-11-06 Tissu non-tissé, et procédé de fabrication de celui-ci WO2020095947A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002061192A1 (fr) * 2001-01-29 2002-08-08 Mitsui Chemicals, Inc. Tissus non tisses de fibres crepees par enroulement et stratifies correspondants
WO2010150611A1 (fr) * 2009-06-24 2010-12-29 チッソ株式会社 Tissu non tissé comportant une structure superficielle irrégulière, et produit associé
WO2014050965A1 (fr) * 2012-09-27 2014-04-03 三井化学株式会社 Tissu non tissé par filage direct
WO2017006972A1 (fr) * 2015-07-06 2017-01-12 三井化学株式会社 Non-tissé filé-lié et articles hygiéniques
JP2017222971A (ja) * 2016-06-14 2017-12-21 王子ホールディングス株式会社 不織布および吸収性物品
JP2018159158A (ja) * 2017-03-23 2018-10-11 出光興産株式会社 スパンボンド不織布

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002061192A1 (fr) * 2001-01-29 2002-08-08 Mitsui Chemicals, Inc. Tissus non tisses de fibres crepees par enroulement et stratifies correspondants
WO2010150611A1 (fr) * 2009-06-24 2010-12-29 チッソ株式会社 Tissu non tissé comportant une structure superficielle irrégulière, et produit associé
WO2014050965A1 (fr) * 2012-09-27 2014-04-03 三井化学株式会社 Tissu non tissé par filage direct
WO2017006972A1 (fr) * 2015-07-06 2017-01-12 三井化学株式会社 Non-tissé filé-lié et articles hygiéniques
JP2017222971A (ja) * 2016-06-14 2017-12-21 王子ホールディングス株式会社 不織布および吸収性物品
JP2018159158A (ja) * 2017-03-23 2018-10-11 出光興産株式会社 スパンボンド不織布

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