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WO2024162401A1 - Matériau anti-poussière, vêtement de protection et procédé de production d'un matériau anti-poussière - Google Patents

Matériau anti-poussière, vêtement de protection et procédé de production d'un matériau anti-poussière Download PDF

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Publication number
WO2024162401A1
WO2024162401A1 PCT/JP2024/003122 JP2024003122W WO2024162401A1 WO 2024162401 A1 WO2024162401 A1 WO 2024162401A1 JP 2024003122 W JP2024003122 W JP 2024003122W WO 2024162401 A1 WO2024162401 A1 WO 2024162401A1
Authority
WO
WIPO (PCT)
Prior art keywords
dust
proof material
nonwoven fabric
layer
fabric layer
Prior art date
Application number
PCT/JP2024/003122
Other languages
English (en)
Japanese (ja)
Inventor
茉莉子 吉田
秀超 北山
尚貴 山岸
Original Assignee
エム・エーライフマテリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by エム・エーライフマテリアルズ株式会社 filed Critical エム・エーライフマテリアルズ株式会社
Publication of WO2024162401A1 publication Critical patent/WO2024162401A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/24—Resistant to mechanical stress, e.g. pierce-proof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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

  • This disclosure relates to dust-proof materials, protective clothing, and methods for manufacturing dust-proof materials.
  • Patent Document 1 discloses a dustproof material used in protective clothing.
  • the dustproof material specifically disclosed in Patent Document 1 includes a three-layer dustproof material.
  • the three-layer dustproof material is formed by stacking and fixing a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric in this order.
  • the meltblown nonwoven fabric is electret-processed (hereinafter, also referred to as "electretized").
  • the charge density of the meltblown nonwoven fabric is 1.0 ⁇ 10 ⁇ 9 coulombs/cm 2 to 8.5 ⁇ 10 ⁇ 9 coulombs/cm 2.
  • the meltblown nonwoven fabric contains a hindered amine additive.
  • the spunbond nonwoven fabric is not electretized.
  • the fixing method is ultrasonic bonding, pinpoint heat bonding, or adhesive (spray).
  • the ratio of the basis weight of the melt-blown nonwoven fabric contained in the dust-proof material of the three-layer structure to the basis weight of the dust-proof material of the three-layer structure (hereinafter also referred to as "MB content") is 42% to 45%.
  • Patent document 1 International Publication No. 2014/208605
  • Electretized meltblown nonwoven fabric is sometimes called a dust-proof collection layer in dust-proof materials because it easily collects dust.
  • a dust-proof collection layer in dust-proof materials because it easily collects dust.
  • the mass of meltblown nonwoven fabric increases, its collection efficiency tends to improve.
  • the mass of meltblown nonwoven fabric increases, its breathability tends to decrease.
  • Protective clothing made of dust-proof material with a high MB content i.e., dust-proof material with a relatively high mass of meltblown nonwoven fabric
  • Patent Document 1 may make workers easily tired and reduce the work efficiency of the workers when worn for a long time. In particular, in high-temperature environments such as summer, there is a risk that the worker may suffer from heat stroke due to heat trapped inside the protective clothing.
  • one embodiment of the present disclosure aims to provide a dust-proof material, protective clothing, and a method for manufacturing a dust-proof material that has a high ratio of collection efficiency to the basis weight of an electret meltblown nonwoven fabric layer and has excellent breathability.
  • a dust-proof material comprising: The basis weight of the dust-proof material is 15 gsm or more and less than 55 gsm, The ratio of the basis weight of the meltblown nonwoven fabric layer to the basis weight of the dust-proof material is 3% or more and less than 10%.
  • ⁇ 4> The dust-proof material according to any one of ⁇ 1> to ⁇ 3>, wherein the average fiber diameter of the fibers of the meltblown nonwoven fabric layer is more than 1.0 ⁇ m and less than 3.0 ⁇ m.
  • ⁇ 5> The dust-proof material according to any one of ⁇ 1> to ⁇ 4>, wherein the meltblown nonwoven fabric layer has a basis weight of less than 10 gsm.
  • ⁇ 6> A plurality of embossed portions formed by fusing a part of the meltblown nonwoven fabric layer and a part of the spunbonded nonwoven fabric layer, The embossing ratio is 3% to 30%;
  • the embossing ratio is 3% to 15%
  • (a) The basis weight of the dust-proof material is 15 gsm or more and 45 gsm or less.
  • the thickness of the dust-proof material is 0.42 mm or less.
  • (c) The basis weight of the meltblown nonwoven fabric layer is less than 10 gsm.
  • the fiber linear density of the meltblown nonwoven fabric layer is 2 ⁇ m gsm to 20 ⁇ m gsm, The fiber linear density indicates a product of the basis weight of the meltblown nonwoven fabric layer and the average fiber diameter of the fibers of the meltblown nonwoven fabric layer.
  • a method for producing a dust-proof material comprising:
  • a dust-proof material comprising: The dust-proof material has an air permeability of 120 ccs or more and 200 ccs or less.
  • ⁇ 17> The dust-proof material according to any one of ⁇ 14> to ⁇ 16>, wherein a ratio of a basis weight of the meltblown nonwoven fabric layer to a basis weight of the dust-proof material is 3% to 15%.
  • the fiber linear density of the meltblown nonwoven fabric layer is 2 ⁇ m gsm to 20 ⁇ m gsm, The fiber linear density indicates a product of the basis weight of the meltblown nonwoven fabric layer and the average fiber diameter of the fibers of the meltblown nonwoven fabric layer.
  • a method for producing a dust-proof material comprising:
  • a dust-proof material, protective clothing, and a method for manufacturing a dust-proof material that has a high ratio of collection efficiency to the basis weight of the electret meltblown nonwoven fabric layer and excellent breathability are provided.
  • FIG. 1 is a schematic diagram for explaining a method for measuring the charge density.
  • each component may contain multiple types of corresponding substances.
  • the amount of each component in a composition in the present disclosure if multiple substances corresponding to each component are present in the composition, the total amount of the multiple substances present in the composition is meant unless otherwise specified.
  • the term "process” includes not only an independent process, but also a process that cannot be clearly distinguished from other processes, as long as the purpose of the process is achieved.
  • a numerical range indicated using “to” indicates a range including the numerical values before and after "to” as the minimum and maximum values, respectively.
  • the content of each component in a composition means the total amount of the multiple substances present in the composition when multiple substances corresponding to each component are present in the composition, unless otherwise specified.
  • electrot refers to a material that permanently retains an electric polarization even in the absence of an external electric field and forms an electric field with respect to its surroundings.
  • the dust-proof material of the first embodiment of the present disclosure includes an electretized meltblown nonwoven fabric layer (hereinafter also referred to as "MB layer”) and a spunbond nonwoven fabric layer (hereinafter also referred to as "SB layer”) laminated and fixed to both main surfaces of the meltblown nonwoven fabric layer.
  • the meltblown nonwoven fabric layer includes a meltblown nonwoven fabric (hereinafter also referred to as "MB”).
  • the spunbond nonwoven fabric layer includes a spunbond nonwoven fabric (hereinafter also referred to as "SB”).
  • the basis weight of the dust-proof material is 15 gsm or more and less than 55 gsm.
  • the basis weight of the dust-proof material is 25 gsm or more and less than 55 gsm.
  • the ratio of the basis weight of the meltblown nonwoven fabric layer to the basis weight of the dust-proof material (hereinafter also referred to as the "MB content") is 3% or more and less than 10% (in this specification, "3% or more and less than 10%” is synonymous with "3% to 10% (however, a dust-proof material with the ratio of 10% is excluded from the dust-proof material of the first embodiment)"; the same applies below).
  • the inventors have discovered that by setting the MB content of a dust-proof material containing an MB layer and an SB layer within the above range, it is possible to provide a dust-proof material that combines collection efficiency and breathability even if the basis weight of the meltblown nonwoven fabric layer is relatively low.
  • nonwoven fabric refers to a flat assembly of fibers that has a certain level of structural integrity achieved by physical and/or chemical processes, excluding weaving, knitting, and papermaking.
  • Meltblown nonwoven refers to a nonwoven fabric made by one or more bonding methods to a meltblown web.
  • Meltblown web refers to a web made by meltblown lamination.
  • Meltblown lamination refers to a method in which molten polymer is extruded into a high velocity hot gas stream into fibers that are then laminated onto a moving screen to make a web.
  • Meltblown nonwoven fabrics typically have an average fiber diameter of less than 10 ⁇ m.
  • meltblown nonwoven fabric layer refers to a meltblown nonwoven fabric layer having a charge density of 1 ⁇ 10 ⁇ 10 coulombs/cm 2 or more.
  • spunbond nonwoven refers to a nonwoven fabric made by one or more bonding methods to a spunbond web.
  • spunbond web refers to a web made by spunbond lamination.
  • spunbond lamination refers to a method in which molten or dissolved polymers are extruded through a nozzle and the filaments are laminated onto a moving screen to make a web. The average fiber diameter of spunbond nonwoven fabrics is usually 10 ⁇ m or more.
  • the dustproof material of the first embodiment has the above-mentioned configuration, and therefore has a high ratio of collection efficiency to the basis weight of the electretized meltblown nonwoven fabric layer, and is excellent in breathability. Therefore, when the dustproof material of the first embodiment is used in protective clothing, the dustproof material of the first embodiment can make the protective clothing lighter than before. As a result, protective clothing using the dustproof material of the first embodiment can make the worker less likely to get tired even when worn for a long time, and can make it difficult for the worker's work efficiency to decrease. In addition, protective clothing using the dustproof material of the first embodiment is less likely to trap hot air inside the protective clothing. As a result, protective clothing using the dustproof material of the first embodiment can suppress the onset of heat stroke even in high-temperature environments such as summer.
  • the dust-proof material is a sheet-like material.
  • the structure of the dust-proof material is appropriately selected depending on the application of the dust-proof material, and may be, for example, a two-layer structure, a three-layer structure, a four-layer structure, or a five-layer structure or more.
  • a three-layer dust-proof material includes an MB layer and an SB layer laminated and fixed on both main surfaces of the MB layer.
  • a four-layer dust-proof material includes an SB layer, an MB layer, an SB layer, and another layer laminated and fixed in this order. The other layers will be described later.
  • the structure of the dust-proof material is preferably a three-layer structure.
  • the mechanical strength of the fibers contained in the MB layer is relatively low.
  • the mechanical strength of the fibers contained in the SB layer is relatively high.
  • the pair of SB layers function as protective layers for the MB layer. Therefore, even if the dust-proof material of the three-layer structure is subjected to a mechanical impact, the MB layer is unlikely to be destroyed. As a result, the dust-proof material can maintain excellent collection efficiency. Therefore, the dust-proof material of the three-layer structure is suitable as a material for protective clothing.
  • the MB content of the dust-proof material is 3% or more and less than 10%. If the MB content of the dust-proof material is 10% or more, it becomes difficult for the air inside the protective clothing to be discharged to the outside. If hot air is trapped inside the protective clothing, it may become uncomfortable to wear during long hours of work. If the MB content of the dust-proof material is less than 3%, the dust-proof material may not have the collection efficiency required for some applications.
  • the MB content in the dust-proof material is preferably 5% or more and less than 10% from the viewpoints of breathability and collection efficiency. The MB content of the dust-proof material was measured in the same manner as described in the examples.
  • the thickness of the dust-proof material is not particularly limited and is appropriately selected depending on the application of the dust-proof material, and is preferably 0.5 mm or less. This makes the thermal conductivity of the dust-proof material better than when the thickness exceeds 0.5 mm. Therefore, when the dust-proof material is used in protective clothing, hot air is less likely to be trapped inside the protective clothing. In addition, the dust-proof material is softer than when the thickness exceeds 0.5 mm. Therefore, when the dust-proof material is used in protective clothing, the protective clothing makes it easier for the worker to move. As a result, the protective clothing is comfortable to wear and the worker's work efficiency is improved.
  • the thickness of the dust-proof material is more preferably 0.2 mm to 0.5 mm.
  • the method for measuring the thickness of the dust-proof material is the same as that described in the examples.
  • the basis weight of the dust-proof material is 15 gsm or more and less than 55 gsm from the viewpoint of reducing carbon dioxide emissions corresponding to the amount of resin used (hereinafter also referred to as "the viewpoint of reducing environmental load").
  • the viewpoint of reducing environmental load the amount of resin used
  • simply reducing the amount of resin used tends to reduce the dustproof performance.
  • dustproof materials with a basis weight of 55 gsm or more for example, the basis weight of the MB layer used in the dustproof collection layer is 25 gsm or more
  • the dustproof material of the first embodiment can provide a dustproof material with good performance even when the basis weight is less than 55 gsm by using a specific laminated structure, and can significantly improve the collection efficiency per basis weight of the MB layer. Furthermore, since the dustproof material of the first embodiment is a protective clothing with a relatively low mass, the dustproof material of the first embodiment can reduce the load on the worker when wearing the protective clothing. In particular, the dustproof material of the first embodiment can improve the workability and comfort of the worker when worn for a long time.
  • the basis weight of the dust-proof material is more preferably 25 gsm to 55 gsm, further preferably 25 gsm to 50 gsm, and even more preferably 25 gsm to 45 gsm. Even if the basis weight of the dustproof material is less than 55 gsm, by setting the MB content to be 3% or more and less than 10%, a better effect can be achieved in terms of collection efficiency per MB basis weight.
  • the method for measuring the basis weight of the dust-proof material is the same as that described in the examples.
  • the air permeability of the dust-proof material is not particularly limited and may be appropriately selected depending on the application of the dust-proof material, and is preferably 35 ccs or more. This allows the dust-proof material to improve the workability of a worker when worn for a long period of time. From the viewpoint of improving the workability of a worker when wearing the material for a long period of time, the breathability of the dustproof material is more preferably 40 ccs to 200 ccs, even more preferably 60 ccs to 200 ccs, particularly preferably more than 105 ccs to 200 ccs, and even more preferably 120 cc to 200 ccs.
  • Conventional dustproof materials have a breathability of 100 ccs or less, which suggests the difficulty of achieving both dustproof performance and breathability, but in the first embodiment, the MB basis weight can be reduced by using a specific layered structure, so that a dustproof material with breathability exceeding that of conventional materials can be designed.
  • the method for measuring the air permeability of the dust-proof material is the same as that described in the Examples.
  • Methods for bonding the SB layer and the MB layer include ultrasonic bonding, heat bonding using a hot embossing roll or a hot calendar roll, or bonding with an adhesive, in order to prevent the SB layer or the MB layer from melting or fusing beyond the desired state due to excessive heat.
  • laminating the SB layer and the MB layer it is preferable to overlap the SB layer and the MB layer and apply heat treatment to the parts to be bonded.
  • the SB layer and the MB layer may be in direct contact with each other.
  • an adhesive layer may not be interposed between the SB layer and the MB layer.
  • the adhesive layer is formed by a known adhesive.
  • the dustproof material has multiple embossed sections formed by fusing a part of the MB layer and a part of the SB layer, and the embossing ratio is preferably 3% to 30%.
  • the embossing ratio indicates the ratio of the total area of the multiple embossed sections formed on one main surface of the dustproof material to the area of the one main surface of the dustproof material.
  • Embossed portion refers to a non-fibrous portion formed by thermally bonding multiple fibers.
  • the shapes of the embossed portion include circle, ellipse, oval, square, diamond, rectangle, square, and continuous shapes based on these shapes.
  • the “embossing ratio” refers to the ratio of the embossed portion to the entire dust-proof material that is subjected to embossing or ultrasonic treatment. Specifically, when the MB layer and the SB layer are thermally bonded by a pair of embossing rolls having projections and recesses, the “embossing ratio” refers to the ratio of the portion where the projections of one embossing roll and the projections of the other embossing roll overlap and come into contact with the dust-proof material (i.e., the embossed portion) to the entire dust-proof material.
  • the "embossing ratio” refers to the ratio of the portion where the projections of the embossing roll having projections and the dust-proof material come into contact with the dust-proof material (i.e., the embossed portion) to the entire dust-proof material.
  • the ratio of the embossed portion to the entire dust-proof material in the embossing process can be regarded as being the same as the imprint area ratio (also referred to as the "embossed area ratio") of the embossing roll that embossed the first laminate (laminate of the MB layer and the SB layer).
  • the "embossed ratio” refers to the ratio of the portion that is thermally fused by ultrasonic processing (i.e., the embossed portion) to the entire dust-proof material.
  • the embossing rate contributes to improving the collection efficiency.
  • the embossing rate of the dust-proof material of the first embodiment is 3% or more, better collection efficiency can be obtained.
  • the embossing rate is 3% to 30%, the dust-proof material becomes soft to the touch, and the comfort of the worker can be improved.
  • the embossing rate is more preferably 3% to 20%.
  • the embossing rate is more preferably 3% to 15%, and further preferably 10% to 15%.
  • the adhesive used in the process is not particularly limited, but examples thereof include hot melt adhesives, powder-based adhesives, and solution-based adhesives.
  • hot melt adhesives are preferred from the viewpoints of cost and the ability to apply the adhesive uniformly to the target object.
  • types of hot melt adhesives include synthetic rubber-based adhesives, olefin-based adhesives, and EVA (ethylene vinyl acetate)-based adhesives. Synthetic rubber-based and olefin-based adhesives are preferred from the viewpoints of excellent adhesive strength and excellent affinity between the SB layer and the MB layer.
  • the melt viscosity of the hot melt adhesive at 140°C is preferably 2000 mPa ⁇ s or less, and more preferably 1500 mPa ⁇ s or less, from the viewpoint of being able to extrude the hot melt adhesive more uniformly from the T-die.
  • the melt viscosity of the hot melt adhesive at 140°C is preferably 300 mPa ⁇ s or more, and more preferably 500 mPa ⁇ s or more.
  • the method of laminating the SB layer and the MB layer with hot melt adhesive includes a method of applying the adhesive to the substrate from a dot pattern roll, a method of applying a powdered adhesive to the substrate and then heating and bonding, and a method of applying the molten adhesive as a spray.
  • a method of applying the hot melt adhesive as a spray from a T-die type extruder is preferable. This method makes it possible to laminate the SB layer and the MB layer without significantly impairing the texture of the dustproof material or the breathability of the dustproof material, and can increase the adhesive strength of the SB layer and the MB layer with a small application amount, and can apply the hot melt adhesive more uniformly.
  • the temperature of the hot melt adhesive when extruded from the T-die is preferably 100°C or higher, and more preferably 130°C or higher.
  • the temperature of the hot melt adhesive when extruded from the T-die is preferably 180°C or less, and more preferably 160°C or less.
  • the absolute value of the difference between the water contact angle of a surface of one SB layer of the dust-proof material (i.e., one main surface of the dust-proof material) and the water contact angle of a surface of the other SB layer of the dust-proof material (i.e., the other main surface of the dust-proof material) may be less than 20°.
  • the water contact angle of the surface of the SB layer is the average value of the values measured by the drop method under the following measurement conditions using a contact angle meter. If water penetrates the SB layer within 5000 mS after dropping a test liquid onto the surface of the SB layer and measurement is impossible, the water contact angle is recorded as "0°".
  • the MB layer functions as a filter layer for dust flying in the air. More specifically, the MB layer captures dust flying in the air and prevents the dust from passing through the dust-proof material.
  • the MB layer contains MB.
  • the MB content is not particularly limited, and from the viewpoint of improving the dust collection efficiency of the dust-proof material, it is preferably 70% by mass to 100% by mass, more preferably 80% by mass to 100% by mass, even more preferably 90% by mass to 100% by mass, and particularly preferably 100% by mass, based on the total amount of the MB layer.
  • the basis weight of the MB layer is appropriately selected depending on the application of the dust-proof material, and is preferably less than 10 gsm. Even if the basis weight of the MB layer of the dust-proof material of the first embodiment is less than 10 gsm, a predetermined collection efficiency can be achieved by a specific laminated structure. If the basis weight of the MB layer is large, the breathability tends to decrease. Since the basis weight of the MB layer of the dust-proof material of the first embodiment is less than 10 gsm, the dust-proof material has excellent breathability and can also improve the comfort of the worker.
  • the basis weight of the MB layer is more preferably 1 gsm or more and less than 10 gsm, even more preferably 1 gsm to 8 gsm, and particularly preferably 1 gsm to 5 gsm.
  • the method for measuring the basis weight of the MB layer is the same as that described in the examples.
  • the basis weight of the MB layer is 8 gsm or less, a better effect is achieved in terms of collection efficiency per MB basis weight by setting the MB content to 3% or more and less than 10%.
  • the charge density of the MB layer is preferably 1 ⁇ 10 ⁇ 10 coulomb/cm 2 or more, more preferably 1 ⁇ 10 ⁇ 9 coulomb/cm 2 or more, and even more preferably 1 ⁇ 10 ⁇ 8 coulomb/cm 2 or more.
  • the charge density of the MB layer is measured using the device shown in Fig. 1. More specifically, as shown in Fig. 1, a sample 3 is sandwiched between a grounded metal box 1 and a metal flat plate electrode 2 (area 100 cm2, material: brass), and the voltage of the charge generated by electrostatic induction is measured by an electrometer 5 via a capacitor 4.
  • the surface charge density is calculated from the measured potential using the following formula (1).
  • Formula (1): Q C ⁇ V/S
  • Q represents the surface charge density (Coulomb/cm 2 )
  • C represents the capacitance of the capacitor
  • V represents the electric potential
  • S represents the area of the flat electrode.
  • the average fiber diameter of the fibers constituting the MB layer (hereinafter also referred to as "MB fibers") is preferably more than 1.0 ⁇ m and not more than 3.0 ⁇ m. This allows both breathability and collection efficiency to be achieved. In general, the smaller the average fiber diameter of the MB fibers, the higher the collection efficiency can be, but on the other hand, the lower the breathability. In order to ensure better breathability in the dust-proof material of the first embodiment, the average fiber diameter of the MB fibers is more preferably more than 1.0 ⁇ m and less than 3.0 ⁇ m, and even more preferably more than 1.5 ⁇ m and less than 3.0 ⁇ m.
  • the average fiber diameter of the MB fibers is more preferably from 2.0 ⁇ m to less than 3.0 ⁇ m.
  • the method for measuring the average fiber diameter of the MB fibers is the same as that described in the Examples.
  • the fiber linear density of the MB layer is not particularly limited, and is preferably 2 ⁇ m ⁇ gsm to 20 ⁇ m ⁇ gsm.
  • the fiber linear density indicates the product of the basis weight of the MB layer and the average fiber diameter of the fibers of the MB layer.
  • the fiber linear density of the MB layer is more preferably 3 ⁇ m ⁇ gsm to 10 ⁇ m ⁇ gsm from the viewpoint of improving the collection efficiency per unit area of the meltblown nonwoven fabric layer.
  • “gsm” stands for Grams per Square Meter (g/m 2 ).
  • the MB fibers may be long or short fibers.
  • the cross-sectional shape of the MB fibers is not particularly limited, and examples include circular, elliptical, and irregular cross sections.
  • the MB fiber may be a composite fiber or a monocomponent fiber.
  • the composite fiber preferably has two or more thermoplastic resins as its constituent components. Examples of composite fibers include core-sheath type, side-by-side type, sea-island type, and parallel type.
  • Resin composition for meltblown nonwoven fabric MB fiber is made of a resin composition for MB (hereinafter also referred to as "MB composition").
  • the MB composition may contain a polyolefin (hereinafter also referred to as a "polyolefin-based polymer". The same applies to other raw materials).
  • the polyolefin used in the meltblown nonwoven fabric of the first embodiment is a homopolymer of an ⁇ -olefin, a copolymer of two or more kinds of ⁇ -olefins, or a mixture of two or more kinds selected from these.
  • ⁇ -olefins examples include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, isopentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene, 1-octadecene, and 1-eicosene.
  • this polyolefin polymer examples include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, and 4-methyl-1-pentene-1-decene copolymer.
  • the polyolefin polymer preferably contains polypropylene, poly-1-butene, or poly-4-methyl-1-pentene, in terms of high strength, ease of adjustment to an appropriate melt viscosity, and ease of molding by melt-blown lamination, and more preferably contains polypropylene, in terms of ease of molding and ease of electretization, etc.
  • This polyolefin polymer exhibits suitable flow characteristics, making it easy to mold by melt-blown lamination, and a nonwoven fabric with excellent strength can be obtained, so [ ⁇ ] is preferably 0.5 dl/g to 3 dl/g, more preferably 0.7 dl/g to 1.5 dl/g, and even more preferably 0.8 dl/g to 1.3 dl/g. [ ⁇ ] is a value measured in decalin at 135°C.
  • the melt flow rate (MFR) of this polyolefin polymer is not particularly limited as long as the MB composition can be melt-spun, and is preferably 50 g/10 min to 5,000 g/10 min, more preferably 200 g/10 min to 4,000 g/10 min, and even more preferably 500 g/10 min to 2,500 g/10 min.
  • the MFR of the polyolefin polymer is measured in accordance with ASTM D-1238 under the conditions of 230° C. and a load of 2.16 kg.
  • the polyolefin-based polymer may be a biomass-derived propylene-based polymer.
  • the main component of the modified polyolefin (A) or polyolefin mixture (B) described below may also be a biomass-derived propylene-based polymer.
  • a biomass-derived propylene-based polymer as the polyolefin-based polymer from the viewpoint of reducing carbon dioxide emissions compared to the case of using fossil fuels using coal or petroleum.
  • Biomass-derived propylene-based polymer refers to a propylene-based polymer produced from raw material monomers containing biomass-derived propylene. Since biomass-derived propylene-based polymers are carbon-neutral materials, they can reduce the environmental impact of producing nonwoven fabric laminates.
  • the biomass-derived propylene-containing monomer which is the raw material of the biomass-derived propylene-based polymer, can be obtained by cracking biomass naphtha or synthesizing it from biomass-derived ethylene.
  • the biomass-derived propylene-based polymer can be obtained by polymerizing the biomass-derived propylene-containing monomer thus synthesized by the same method as that used in the case of using petroleum-derived propylene.
  • a propylene-based polymer synthesized using a bio-derived propylene-containing monomer as a raw material is a biomass-derived propylene-based polymer.
  • the content of the bio-derived propylene-based polymer in the raw material monomer is more than 0 mass% and may be 100 mass% or less with respect to the total amount of the raw material monomer.
  • the monomers that are the raw materials for the biomass-derived propylene-based polymer may further contain, in addition to bio-derived propylene, propylene derived from fossil fuels such as petroleum, and/or ⁇ -olefins other than ethylene and propylene (1-butene, 1-hexene, etc.).
  • the biomass-derived propylene-based polymer may be obtained by polymerizing propylene obtained by synthesis of olefins from methanol (MTO: Methanol-to-Olefins) using a specific gas.
  • the "specific gas” refers to a gas generated by pyrolysis of empty fruit bunches (EFB: Empty Fruit Bunches) (e.g., coconut shells, etc.).
  • the biomass-derived propylene-based polymer may also be obtained by polymerizing propylene obtained by synthesis of propylene from methanol (MTP: Methanol-to-Propylene) using a specific gas.
  • biomass-derived propylene polymers can also be obtained by polymerizing propylene obtained by dehydrating isopropanol produced by fermentation of biomass raw materials mainly consisting of non-edible plants (e.g., sorgo, etc.).
  • biomass-derived carbon content will be 100%. Therefore, the biomass degree of a biomass-derived propylene-based polymer will be 100%. Since fossil fuel-derived raw materials contain almost no C14, the biomass-derived carbon content in a propylene-based polymer produced only from fossil fuel-derived raw materials will be 0%, and the biomass degree of a fossil fuel-derived propylene-based polymer will be 0%.
  • Biomass degree indicates the content of carbon derived from biomass, and is calculated by measuring radioactive carbon (C14). Carbon dioxide in the atmosphere contains a certain percentage of C14 (approximately 105.5 pMC). For this reason, it is known that the C14 content in plants that grow by absorbing carbon dioxide from the atmosphere (such as corn) is also about 105.5 pMC. It is also known that fossil fuels contain very little C14. Therefore, by measuring the proportion of C14 contained in the total carbon atoms in the propylene polymer, the content of carbon derived from biomass in the raw material can be calculated.
  • C14 radioactive carbon
  • the biomass content of the propylene-based polymer used as the raw material for the MB layer is preferably 10% or more.
  • the content of the biomass-derived propylene-based polymer used in the MB layer may be 5% by mass to 99% by mass, 10% by mass to 75% by mass, or 20% by mass to 50% by mass, relative to 100% by mass of the combined total of the fossil fuel-derived polypropylene resin and the biomass-derived polypropylene resin.
  • the propylene-based polymer used as the raw material of the MB layer may contain a propylene-based polymer obtained by recycling, that is, a so-called recycled polymer.
  • the term "recycled polymer” includes polymers obtained by recycling waste polymer products. Recycled polymers can be produced, for example, by the method described in DE 102019127827 (A1). Recycled polymers may contain a marker that identifies them as having been obtained by recycling.
  • the MB composition may contain a charging agent. This makes the MB layer more likely to become an electret. As a result, the collection efficiency of the dust-proof material is improved.
  • the charging agent examples include a graft-modified copolymer, a hindered amine-based compound, or a triazine-based compound.
  • the charging agent preferably contains at least one of a graft-modified copolymer, a hindered amine-based compound, and a triazine-based compound, and may be a graft-modified copolymer, or at least one of a hindered amine-based compound and a triazine-based compound.
  • the charging agent does not have to contain a hindered amine-based compound. Details of the graft-modified copolymer, the hindered amine-based compound, and the triazine-based compound will be described later.
  • the content of the electrostatic agent is preferably 0.01% by mass to 7.0% by mass, more preferably 0.05% by mass to 6.0% by mass, based on the total amount of the MB composition.
  • the MB composition may contain a first graft-modified copolymer or a second graft-modified copolymer.
  • the first graft-modified copolymer refers to a graft-modified copolymer obtained by graft-copolymerizing a monomer having a polar group onto a non-polar polymer.
  • the second graft-modified copolymer refers to a graft-modified copolymer obtained by graft-copolymerizing a monomer having a polar group onto a specific polymer.
  • the specific polymer is obtained by introducing a polar group into the side chain or main chain of a non-polar polymer by oxidation or halogenation.
  • the charging agent is a graft-modified copolymer
  • a corona charging method is used as a charging method.
  • Examples of the polar group include halogen atoms such as chlorine, fluorine, bromine, or iodine; atomic groups such as carbonyl or nitro; and groups represented by -COOCH3 , -COOC2H5 , -OCOCH3 , -OC2H5 , -OCH2C6H5 , -COOH , -OH, -NH2 , -CONH2 , or -COONH4 .
  • halogen atoms such as chlorine, fluorine, bromine, or iodine
  • atomic groups such as carbonyl or nitro
  • -COONH4 One or more of these
  • the graft-modified copolymer obtained by graft copolymerization of a monomer having a polar group may contain a modified polyolefin (A) or a polyolefin mixture (B).
  • the modified polyolefin (A) refers to a modified polyolefin modified with at least one modifying monomer selected from unsaturated carboxylic acids and their derivatives.
  • the polyolefin mixture (B) contains a modified polyolefin (A) and an unmodified polyolefin.
  • the modified polyolefin (A) and the unmodified polyolefin may be made of the same polyolefin or different polyolefins.
  • the amount of polar groups in the MB composition is preferably 1 mol% or less, more preferably 0.5 mol% or less.
  • the polyolefin which is the main component of the modified polyolefin (A) or the polyolefin mixture (B), is a homopolymer of an ⁇ -olefin, a copolymer of two or more kinds of ⁇ -olefins, or a mixture of two or more kinds selected from these.
  • ⁇ -olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, isopentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene, 1-octadecene, and 1-eicosene.
  • the modified polyolefin (A) or the unmodified polyolefin that is the main component of the polyolefin mixture (B) is preferably a resin mixture from the viewpoint of obtaining an MB having an excellent balance between strength and thermal processability.
  • the resin mixture is composed of (a) 98% to 40% by mass of polypropylene and (b) 2% to 60% by mass of an ethylene- ⁇ -olefin copolymer having a density of less than 0.900 g/ cm3 and a crystallinity of 5% to 40% (the total of (a) + (b) is 100% by mass).
  • Modified polyolefin (A) which is a component of modified polyolefin (A) or polyolefin mixture (B), is obtained by graft-modifying a polyolefin with at least one modifying monomer selected from unsaturated carboxylic acids and their derivatives.
  • Examples of the polyolefin that is the main component of the modified polyolefin (A) include homopolymers of ⁇ -olefins, copolymers of two or more kinds of ⁇ -olefins, etc.
  • Examples of the homopolymers of ⁇ -olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, isopentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene, 1-octadecene, and 1-eicosene.
  • polystyrene resin examples include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, and 4-methyl-1-pentene-1-decene copolymer.
  • polypropylene when polypropylene is used as the unmodified polyolefin, it is preferable to use polypropylene as the raw material polyolefin of the graft-modified polyolefin.
  • Unsaturated carboxylic acids or derivatives thereof used as modified monomers include unsaturated carboxylic acids, their anhydrides, esters, amides, imides, and chlorides.
  • Unsaturated carboxylic acids or derivatives thereof include acrylic acid, methacrylic acid, vinyl acetate, ethyl acrylic acetate, 2,4-pentadienoic acid, carboxystyrene, maleic acid, fumaric acid, itaconic acid, citraconic acid, allyl succinic acid, mesaconic acid, glutaconic acid, nadic acid, methyl nadic acid, tetrahydrophthalic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, monomethyl maleate, dimethyl maleate, monoethyl maleate, diethyl maleate, monomethyl fumarate, dimethyl fumarate, monoethyl fumarate, diethyl fumarate, monomethyl citraconic acid, dimethyl citraconic acid, monoethyl citraconic acid, diethyl citraconic acid
  • modified polyolefin (A) by grafting the above-mentioned modifying monomer onto a polyolefin.
  • the reaction can be carried out by heating the polyolefin and the modifying monomer to a high temperature in the presence or absence of a solvent, with or without the addition of a radical initiator.
  • Other vinyl monomers such as styrene may be present during the reaction.
  • the content of the modified monomer in the modified polyolefin (A) is preferably 3 mol % or less, more preferably 1.5 mol % or less.
  • the graft ratio is preferably 1 mol % or less.
  • the intrinsic viscosity (135°C, decalin) of the modified polyolefin (A) is preferably 0.1 dl/g to 3.0 dl/g, more preferably 0.3 dl/g to 2.0 dl/g, and even more preferably 0.5 dl/g to 1.5 dl/g, in order to facilitate uniform mixing with unmodified polyolefin, to provide suitable flow properties, and to facilitate the production of nonwoven fabrics by the melt-blowing method.
  • the content ratio of modified polyolefin (A) to unmodified polyolefin (modified polyolefin (A)/unmodified polyolefin) is preferably 0.1/99.9 to 20/80, more preferably 1/99 to 5/95, in mass ratio.
  • Hindered amine compound The charging agent may contain a hindered amine compound, or may be a hindered amine compound. The charging agent does not have to contain a hindered amine compound. When the charging agent is a hindered amine compound, a hydrocharging method is used as a charging method.
  • Hindered amine compounds include poly[(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl)((2,2,6,6-tetramethyl-4-piperidyl)imino)hexamethylene((2,2,6,6-tetramethyl-4-piperidyl)imino)], dimethyl succinate-1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, and bis(1,2,2,6,6-pentamethyl-4-piperidyl)-2-n-butylmalonate.
  • the charging agent may contain a triazine-based compound or may be a triazine-based compound.
  • a hydrocharging method is used as a charging method.
  • Triazine compounds include poly[(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl)((2,2,6,6-tetramethyl-4-piperidyl)imino)hexamethylene((2,2,6,6-tetramethyl-4-piperidyl)imino)], or 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-((hexyl)oxy)-phenol.
  • the MB composition may contain various additives as long as they do not impair the objectives of the present disclosure.
  • additives include antioxidants, UV absorbers, pigments, dyes, nucleating agents, fillers, slip agents, antiblocking agents, lubricants, flame retardants, and plasticizers.
  • the modified polyolefin (A) and the unmodified polyolefin, and various additives as necessary are mixed and then melt-kneaded.
  • the mixer that can be used include a ribbon blender, a V-type blender, a tumbler, and a Henschel mixer.
  • the melt-kneading can be carried out, for example, by using a melt-kneading method using an apparatus (for example, a single-screw or twin-screw extruder, a Banbury mixer, a kneader, or a two-roll mill, etc.).
  • the SB layer functions as a protective layer for the MB layer. Specifically, the SB layer relieves the stress applied to the MB layer when a mechanical impact is applied to the dust-proof material.
  • the SB layer contains SB.
  • the amount of SB is not particularly limited, and from the viewpoint of improving the collection efficiency of the dust-proof material, the amount of SB is preferably 70% by mass to 100% by mass, more preferably 80% by mass to 100% by mass, even more preferably 90% by mass to 100% by mass, and particularly preferably 100% by mass, based on the total amount of the SB layer.
  • the SB layer may be an SB layer that has been subjected to an electret treatment, or may be an SB layer that has not been subjected to an electret treatment.
  • the SB layer is preferably an electret-treated SB layer.
  • the collection efficiency of the dust-proof material particularly the collection efficiency per MB basis weight, can be improved.
  • the SB layer may or may not contain a charging agent. It is more preferable that at least one layer of the SB layer is an SB layer containing a charging agent.
  • the phrase "at least one layer of the SB layer contains a charging agent” includes an embodiment in which the charging agent is contained in at least one layer of the SB layer by laminating the SB layer and the electretized MB layer, and a part of the charging agent added to the MB layer moves to the SB layer (bleeds out).
  • the basis weight of the SB layer is appropriately selected depending on the application of the dust-proof material, etc., and is preferably 50 gsm or less from the viewpoint of the flexibility of the dust-proof material and reduction of the environmental load, and is preferably 10 gsm or more from the viewpoint of the strength of the dust-proof material, and is more preferably 15 gsm to 50 gsm from both viewpoints.
  • the method for measuring the basis weight of the SB layer is the same as that described in the examples.
  • the average fiber diameter of the fibers constituting the SB layer (hereinafter also referred to as "SB fibers") is not particularly limited, and is generally 10 ⁇ m to 50 ⁇ m.
  • the method for measuring the average fiber diameter of the SB fibers is the same as that described in the Examples.
  • the SB fiber may be a long fiber or a short fiber.
  • the cross-sectional shape of the SB fiber is not particularly limited, and may be, for example, a circular, elliptical, or irregular cross-section (for example, a hollow fiber, a V-shaped, a cross-shaped, or a T-shaped).
  • the cross-sectional shape of the SB fiber is preferably a hollow fiber, since it can reduce the basis weight and reduce CO2 emissions.
  • the SB fiber may contain commonly used additives as necessary.
  • additives include electrostatic agents, antistatic agents, absorbent particles, nanoparticles, ion exchange resins, deodorants, fragrances, adhesives, surface modifiers, biocides, antibacterial agents, antiviral agents, flame retardants, stabilizers, antioxidants, weather stabilizers, heat stabilizers, light stabilizers, anti-fogging agents, lubricants, conductive materials, dyes, pigments, natural oils, synthetic oils, and waxes.
  • the additives may be known additives.
  • the SB fiber may be a composite fiber, a monocomponent fiber, a crimped fiber, or a single fiber.
  • the composite fiber preferably has two or more thermoplastic resins as its constituent components. Examples of composite fibers include a core-sheath type, a side-by-side type, an island-in-the-sea type, and a parallel type.
  • the SB fiber may contain multiple resins.
  • SB composition (1.1.2.2) Resin composition for spunbond nonwoven fabric
  • SB composition a resin composition for spunbond nonwoven fabric
  • the SB composition preferably contains a polyolefin-based polymer.
  • the polyolefin-based polymer include the same olefins as those exemplified as the olefins in the MB fiber.
  • the melt flow rate (MFR) of the polyolefin polymer is not particularly limited as long as the SB composition can be melt-spun, and is preferably 1 g/10 min to 1000 g/10 min, more preferably 5 g/10 min to 500 g/10 min, and even more preferably 10 g/10 min to 100 g/10 min.
  • the MFR of the polyolefin polymer is measured in accordance with ASTM D-1238 under the conditions of 230° C. and a load of 2.16 kg.
  • the content of the polyolefin polymer is preferably 55.0% by mass to 95.0% by mass, more preferably 65.0% by mass to 95.0% by mass, even more preferably 75.0% by mass to 95.0% by mass, and particularly preferably 85.0% by mass to 95.0% by mass, based on the total amount of the SB composition.
  • the polyolefin polymer may be a commercially available product.
  • the SB composition may contain a polymer other than a polyolefin-based polymer (hereinafter also referred to as "other polymers"), or may not contain other polymers.
  • other polymers include thermoplastic elastomers and thermoplastic resins other than polyolefin-based polymers.
  • thermoplastic elastomers examples include styrene-based elastomers, polyester-based elastomers, polyamide-based elastomers, thermoplastic polyurethane-based elastomers, vinyl chloride-based elastomers, and fluorine-based elastomers.
  • thermoplastic resins other than polyolefin polymers include polyesters, polyamides (for example, nylon-6, nylon-66, polymetaxyleneadipamide, etc.), polyvinyl chloride, polyimides, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate-vinyl alcohol copolymers, ethylene-(meth)acrylic acid copolymers, ethylene-acrylic acid ester-carbon monoxide copolymers, polyacrylonitrile, polycarbonate, and polystyrene.
  • the polyester may be, for example, an aliphatic polyester or a polyester copolymer.
  • the polyester copolymer may be a copolymer of an aliphatic dicarboxylic acid alone or a mixture of an aliphatic dicarboxylic acid and an aromatic dicarboxylic acid, and one or more diols.
  • the content of polyolefin polymer in the SB layer is preferably more than 90% by mass and not more than 100% by mass, more preferably 95% by mass to 100% by mass, based on the total of polyolefin polymer and other polymers (i.e., thermoplastic elastomers and thermoplastic resins other than polyolefin polymers), and more preferably 95% by mass to 100% by mass.
  • the SB composition may contain a charging agent. This makes the SB layer more likely to become an electret. As a result, the collection efficiency of the dust-proof material is improved.
  • the electrostatic agent may be the same as those exemplified as the electrostatic agent in the MB fiber.
  • the content of the electrostatic agent may be 0.01% by mass to 7.0% by mass relative to the total amount of the SB composition.
  • the SB composition may contain various additives as long as they do not impair the objectives of the present disclosure.
  • additives include antioxidants, UV absorbers, pigments, dyes, nucleating agents, fillers, slip agents, antiblocking agents, lubricants, flame retardants, and plasticizers.
  • the dust-proof material may or may not have other layers depending on the application.
  • the other layers are laminated on at least one of the main surfaces of the dust-proof material.
  • Other layers may include knitted fabric, woven fabric, nonwoven fabric, or film.
  • methods of laminating (bonding) other layers to the dust-proof material include heat embossing, heat fusion (e.g., ultrasonic fusion), mechanical interlacing (e.g., needle punch, water jet), a method using an adhesive (e.g., hot melt adhesive, urethane adhesive), or extrusion lamination.
  • nonwoven fabrics include spunbond nonwoven fabrics, meltblown nonwoven fabrics, wet nonwoven fabrics, dry nonwoven fabrics, dry pulp nonwoven fabrics, flash spun nonwoven fabrics, spread nonwoven fabrics, etc. These nonwoven fabrics may be stretchable or non-stretchable nonwoven fabrics.
  • non-elastic nonwoven fabric refers to a nonwoven fabric that does not generate a return stress after being stretched in the MD (machine direction, the machine direction of the nonwoven fabric) or the CD (the direction perpendicular to the machine direction, the cross direction of the nonwoven fabric).
  • the film is preferably a breathable (moisture-permeable) film.
  • breathable films include films made of moisture-permeable thermoplastic elastomers (e.g., polyurethane-based elastomers, polyester-based elastomers, polyamide-based elastomers, etc.), porous films, etc.
  • the porous film is made by stretching a film made of a thermoplastic resin containing inorganic or organic fine particles to make it porous.
  • the thermoplastic resin used for the porous film is preferably a polyolefin.
  • polyolefins examples include high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, and polypropylene random copolymers. These polyolefins may be used alone or in combination of two or more types. However, when it is not necessary to maintain the breathability and hydrophilicity of the nonwoven fabric laminate, a film of a thermoplastic resin such as polyethylene, polypropylene, or a combination of these may be used.
  • the resin composition used in at least one of the meltblown nonwoven fabric layer and the spunbonded nonwoven fabric layer is preferably a polyolefin.
  • the embossing rate is preferably 3% to 15%. This results in high collection efficiency per MB basis weight, and the dustproof material has appropriate flexibility and is less likely to trap hot air (good breathability), improving comfort and workability.
  • the dust-proof material of the first embodiment has an embossing rate of 3% to 15% and satisfies any one of the following (a1) to (d1):
  • (a1) The basis weight of the dust-proof material is 15 gsm or more and 50 gsm or less.
  • the average fiber diameter of the MB layer is more than 1.5 ⁇ m and 2.6 ⁇ m or less.
  • (c1) The basis weight of the MB layer is 4 gsm or less and more than 1.5 ⁇ m.
  • the fiber linear density is 2 ⁇ m gsm to 10 ⁇ m gsm.
  • the dust-proof material of the first embodiment has an embossing rate of 3% to 15% and satisfies any one of the following (a2) to (c2):
  • the basis weight of the dust-proof material is 15 gsm or more and 40 gsm or less.
  • the thickness of the dust-proof material is 0.41 mm or less.
  • the basis weight of the SB layer is 40 gsm or less.
  • the dust-proof material of the first embodiment has an embossing rate of 3% to 15% and satisfies any one of the following (a3) to (c3):
  • the basis weight of the dust-proof material is 15 gsm or more and 45 gsm or less.
  • the thickness of the dust-proof material is 0.42 mm or less.
  • the basis weight of the MB layer is less than 10 gsm.
  • the dust-proof material of the first embodiment preferably satisfies the following (a4) and (b4).
  • the embossing rate is 8% to 15%.
  • the basis weight of the dust-proof material is 15 gsm or more and 35 gsm or less.
  • the protective clothing of the first embodiment uses the dust-proof material of the first embodiment.
  • the protective clothing of the first embodiment has the above-mentioned configuration and is therefore lighter than conventional protective clothing.
  • the protective clothing of the first embodiment can prevent a worker from becoming tired even when worn for a long period of time, and can prevent the worker's work efficiency from decreasing.
  • the protective clothing of the first embodiment is less likely to trap hot air inside the protective clothing than conventional protective clothing.
  • the protective clothing of the first embodiment can prevent the onset of heat stroke even in a high-temperature environment such as in the summer.
  • the form of the protective clothing is not particularly limited, and examples thereof include coveralls, raincoats, gowns, etc. that cover the entire body.
  • the protective clothing of the first embodiment can be obtained, for example, by cutting the dustproof material of the first embodiment into a predetermined shape to obtain protective clothing components, and then bonding the obtained protective clothing components.
  • the bonding method may be a known method, such as sewing, crimping, or adhesion.
  • the manufacturing method of the dust-proof material of the first embodiment is a method for manufacturing the dust-proof material of the first embodiment.
  • the manufacturing method of the dust-proof material of the first embodiment includes laminating a meltblown web (hereinafter also referred to as "MB web") and a spunbond web (hereinafter also referred to as "SB web") in-line to prepare a first laminate (hereinafter also referred to as "in-line lamination process”); embossing the first laminate to prepare a second laminate (hereinafter also referred to as “embossing process”); and electretizing the second laminate to prepare the dust-proof material (hereinafter also referred to as "electretizing process”).
  • the in-line lamination process, the embossing process, and the electretizing process are performed in this order.
  • “Laminating a meltblown web and a spunbond web in-line” refers to performing meltblown lamination and spunbond lamination on the same moving screen to prepare a first laminate in one step. Specifically, when the dust-proof material has a three-layer structure, spunbond lamination, meltblown lamination, and spunbond lamination are performed in this order on the same moving screen to prepare a first laminate with a three-layer structure in one step.
  • the "embossing process” refers to a process in which the first laminate is sandwiched between an embossing roll and a mirror roll, and some of the fibers contained in the first laminate are thermally compressed to form a plurality of embossed portions.
  • the MB web becomes an MB layer
  • the SB web becomes an SB layer
  • the MB layer and the SB layer are laminated and fixed.
  • electroactive treatment refers to a treatment for converting a nonwoven fabric in the absence of an external electric field into a nonwoven fabric that permanently retains electric polarization and forms an electric field with respect to its surroundings.
  • the manufacturing method of the dust-proof material of the first embodiment has the above-mentioned configuration, so that it is possible to manufacture a dust-proof material that has a high ratio of collection efficiency to the basis weight of the electretized meltblown nonwoven fabric layer and has excellent breathability.
  • the first laminate is a precursor of the dust-proof material.
  • the first laminate has an MB web and an SB web laminated on at least one main surface of the MB web.
  • the MB web and the SB web are not fixed.
  • the method of laminating the MB web and the SB web in-line may be carried out using a known manufacturing device.
  • the raw material for the MB web is the MB composition described above.
  • the raw material for the SB web is the SB composition described above.
  • the second laminate is a precursor of the dust-proof material.
  • the second laminate has an MB layer and an SB layer laminated and fixed to at least one of the main surfaces of the MB layer.
  • the structure of the second laminate is the same as that of the first laminate, except that it is embossed.
  • the first laminate is sandwiched between an embossing roll and a mirror roll to form multiple embossed portions.
  • the embossing roll has multiple protrusions arranged in a regular pattern on its surface.
  • the embossing roll transfers the shape of the top surfaces of the multiple protrusions to some of the multiple fibers contained in the first laminate. In this way, the embossing roll forms multiple embossed portions arranged in a regular pattern on the dust-proof material.
  • the shape of the top surfaces of the multiple protrusions arranged in the regular pattern of the embossing roll is the same as the shape exemplified as the embossed portion described above.
  • the preferred range of the area ratio of the multiple protrusions of the embossing roll (hereinafter also referred to as the "embossed area ratio”) is the same as the embossing ratio.
  • the surface temperature of the embossing roll is preferably (resin melting point - 20°C) to (resin melting point + 20°C), more preferably (resin melting point - 15°C) to (resin melting point + 10°C), and even more preferably (resin melting point - 15°C) to the resin melting point.
  • the method of electretization is not particularly limited as long as it can convert the nonwoven fabric contained in the second laminate into an electret, and examples include a corona charging method, and a method in which the second laminate is applied with water or an aqueous solution of a water-soluble organic solvent and then dried to convert it into an electret (for example, the method described in JP-A-9-501604 or JP-A-2002-115177, also known as the hydrocharging method), etc.
  • the electric field strength is preferably 10 kV/cm or more, more preferably 15 kV/cm or more, and even more preferably 25 kV/cm or more. From the viewpoint of preventing damage to the dust-proof material, the electric field strength is preferably less than 50 kV/cm.
  • the dust-proof material has a three-layer structure
  • the MB layer is electretized by performing electret treatment by the corona charging method on one main surface of the dust-proof material.
  • the dust-proof material has a three-layer structure, from the viewpoint of improving the collection efficiency of the dust-proof material, it is preferable that the electret treatment is performed on both main surfaces of the dust-proof material by the corona charging method.
  • a dustproof material, protective clothing, and dustproof material are provided that have a high ratio of collection efficiency to the basis weight of the electretized meltblown nonwoven fabric layer and excellent breathability. Therefore, the dustproof material of the first embodiment can be widely used, taking advantage of the above characteristics, as surgical work clothes, clean room work clothes, work clothes in various fields (e.g., bio-, pharmaceutical, food, or electronic-related fields), and work clothes in special environments (e.g., laboratory clothes, radiation protection clothes, work clothes for work (e.g., dust/powder work, demolition work, asbestos removal work, etc.)).
  • the dustproof material of the first embodiment can also be used as protective work clothing for the above-mentioned applications (e.g., aprons, vests, overpants, arm covers, caps, masks, gloves, or shoe covers, etc.).
  • a dust-proof material according to a second embodiment of the present disclosure includes an electretized meltblown nonwoven fabric layer and a spunbond nonwoven fabric layer laminated and fixed to both main surfaces of the meltblown nonwoven fabric layer.
  • the meltblown nonwoven fabric layer includes a meltblown nonwoven fabric.
  • the spunbond nonwoven fabric layer includes a spunbond nonwoven fabric.
  • the dust-proof material has a basis weight of 25 gsm or more and less than 55 gsm.
  • the ratio of the basis weight of the meltblown nonwoven fabric layer to the basis weight of the dust-proof material is 3% to 10%. However, a dust-proof material having the ratio of 10% is excluded from the dust-proof material of the second embodiment.
  • the dustproof material of the second embodiment has the above-mentioned configuration, and therefore has a high ratio of collection efficiency to the basis weight of the electretized meltblown nonwoven fabric layer, and is excellent in breathability. Therefore, when the dustproof material of the second embodiment is used in protective clothing, the dustproof material of the second embodiment can make the protective clothing lighter than before. As a result, protective clothing using the dustproof material of the second embodiment can make the worker less likely to get tired even when worn for a long time, and can make it difficult for the worker's work efficiency to decrease. In addition, protective clothing using the dustproof material of the second embodiment is less likely to trap hot air inside the protective clothing. As a result, protective clothing using the dustproof material of the second embodiment can suppress the onset of heat stroke even in high-temperature environments such as summer.
  • the dustproof material of the second embodiment can be the same as that of the first embodiment, except that the basis weight of the dustproof material is 25 gsm or more and less than 55 gsm.
  • the dust-proof material of the third embodiment includes a meltblown nonwoven fabric layer (hereinafter also referred to as "MB layer”) containing an electretized meltblown nonwoven fabric (hereinafter also referred to as "MB”), and a spunbond nonwoven fabric layer (hereinafter also referred to as "SB layer”) containing a spunbond nonwoven fabric (hereinafter also referred to as "SB”) laminated and fixed to both main surfaces of the meltblown nonwoven fabric layer.
  • the air permeability of the dust-proof material is 120 ccs or more and 200 ccs or less.
  • the dustproof material of the third embodiment has the above-mentioned configuration, and therefore has a high ratio of collection efficiency to the basis weight of the electretized meltblown nonwoven fabric layer, and is excellent in breathability. Therefore, when the dustproof material of the third embodiment is used in protective clothing, the dustproof material of the third embodiment can make the protective clothing lighter than before. As a result, protective clothing using the dustproof material of the third embodiment can make the worker less likely to get tired even when worn for a long time, and can make it difficult for the worker's work efficiency to decrease. In addition, protective clothing using the dustproof material of the third embodiment is less likely to trap hot air inside the protective clothing. As a result, protective clothing using the dustproof material of the third embodiment can suppress the onset of heat stroke even in high-temperature environments such as summer.
  • the dustproof material of the third embodiment can be similar to that of the first embodiment, except that it does not have to have the following characteristics: SB layers are fixed to both main surfaces of the MB layer, the breathability of the dustproof material is 120 ccs or more and 200 ccs or less, and the ratio of the basis weight of the meltblown nonwoven fabric layer to the basis weight of the dustproof material (hereinafter also referred to as the "MB content") is 3% or more and less than 10%.
  • the structure, MB content, thickness, basis weight, breathability, embossed portion, MB layer, SB layer, and other layers of the dustproof material of the second embodiment are the same as those of the first embodiment.
  • the breathability of the dustproof material is 120 ccs or more and 200 ccs or less.
  • the pressure loss of the dustproof material is 10.0 Pa or less, the breathability in the above range can be achieved, and the collection efficiency per unit weight can be improved.
  • the pressure loss of the dustproof material is preferably 3.0 Pa to 10.0 Pa, and more preferably 4.8 Pa to 10.0 Pa.
  • the collection efficiency per unit weight of the MB layer of the dustproof material is preferably 15%/gsm or more.
  • the value obtained by dividing the collection efficiency per unit weight of the MB layer of the dustproof material by the average fiber diameter of the MB layer is preferably 6.0%/(gsm ⁇ m) or more.
  • Methods for adjusting the breathability of the dust-proof material to within the range of 120 ccs or more and 200 ccs or less include, for example, adjusting the basis weight and fiber diameter of the meltblown and spunbond nonwoven fabric layers, the embossing rate, the void ratio by controlling the thickness, the MB content, or the electret ratio.
  • the thickness of the dust-proof material is preferably 0.5 mm or less. This makes the thermal conductivity of the dust-proof material better than when the thickness exceeds 0.5 mm. As a result, the protective clothing is comfortable to wear and improves the work efficiency of the worker.
  • the basis weight of the dustproof material is preferably less than 55 gsm, more preferably 15 gsm to 50 gsm, even more preferably 25 gsm to 50 gsm, and even more preferably 25 gsm to 50 gsm.
  • the dust-proof material preferably has a plurality of embossed portions formed by fusing a part of the MB layer and a part of the SB layer, and the embossed ratio is 3% to 15%.
  • the embossed ratio indicates the ratio of the total area of the plurality of embossed portions formed on one main surface of the dust-proof material to the area of the one main surface of the dust-proof material.
  • the embossing rate contributes to improving the collection efficiency. It was found that the collection efficiency is improved by setting the embossing rate of the dust-proof material of the third embodiment to 3% or more. When the embossing rate is 3% to 30%, the dust-proof material becomes soft to the touch, and the comfort of the worker can be improved.
  • the basis weight of the MB layer is preferably less than 10 gsm. Even if the basis weight of the MB layer of the dust-proof material of the third embodiment is less than 10 gsm, a predetermined collection efficiency can be achieved by a specific laminated structure. When the basis weight of the MB layer is large, the breathability tends to decrease. However, since the basis weight of the MB layer of the dust-proof material of the third embodiment is less than 10 gsm, the dust-proof material has excellent breathability and can also improve the comfort of the worker.
  • the average fiber diameter of the fibers in the MB layer is preferably more than 1.0 ⁇ m and not more than 3.0 ⁇ m, more preferably more than 1.0 ⁇ m and less than 3.0 ⁇ m, and even more preferably more than 1.5 ⁇ m and less than 3.0 ⁇ m. This allows both breathability and collection efficiency to be achieved.
  • the fiber linear density of the MB layer is preferably 2 ⁇ m ⁇ gsm to 20 ⁇ m ⁇ gsm.
  • the fiber linear density indicates the product of the basis weight of the MB layer and the average fiber diameter of the fibers in the MB layer.
  • the ratio of the basis weight of the meltblown nonwoven fabric layer to the basis weight of the dust-proof material is preferably 3% to 15%.
  • the SB layer is preferably an electret-treated SB layer.
  • the dust-collection efficiency of the dust-proof material in particular the collection efficiency per MB basis weight, can be improved.
  • the resin composition used for the meltblown nonwoven fabric layer and/or the spunbonded nonwoven fabric layer is preferably a polyolefin polymer.
  • the protective clothing of the third embodiment uses the dust-proof material of the third embodiment.
  • the protective clothing of the third embodiment has the above-mentioned configuration, and therefore can prevent the worker from getting tired even when worn for a long time, and can prevent the worker's work efficiency from decreasing.
  • the protective clothing of the third embodiment can prevent the onset of heat stroke even in a high-temperature environment such as summer.
  • the protective clothing of the third embodiment is similar to the protective clothing of the first embodiment, except that the dust-proof material of the third embodiment is used instead of the dust-proof material of the first embodiment.
  • the manufacturing method of the dust-proof material of the third embodiment is a method for manufacturing the dust-proof material of the third embodiment.
  • the manufacturing method of the dust-proof material of the third embodiment includes laminating a meltblown web and a spunbond web in-line to prepare a first laminate, embossing the first laminate to prepare a second laminate, and electretizing the second laminate to prepare the dust-proof material. Since the manufacturing method of the dust-proof material of the third embodiment has the above-mentioned configuration, it is possible to manufacture a dust-proof material having a high ratio of collection efficiency to basis weight of the electret melt-blown nonwoven fabric layer and excellent breathability.
  • the method for producing the dust-proof material of the third embodiment is similar to the method for producing the dust-proof material of the first embodiment.
  • Example 1 [1.1.1] In-line Lamination Process A three-layer laminate was made in one step by performing spunbond lamination, meltlon lamination, and spunbond lamination in that order on the same moving screen as follows:
  • a propylene homopolymer having an MFR of 60 g/10 min was used and melt spun by conventional spunbond lamination at 230° C. in a spunbond nonwoven fabric molding machine having a spinneret with a diameter of 0.6 mm.
  • the fibers obtained by spinning were deposited on the collecting surface of a screen to obtain a first spunbond web having an average fiber diameter of 17 ⁇ m and a basis weight of 14 gsm.
  • meltblown web having a basis weight of 2 gsm.
  • the diameter of the spinning nozzle of the die was 0.38 mm.
  • fibers were deposited on the meltblown web in the same manner as the spunbond web to form a second spunbond web having an average fiber diameter of 17 ⁇ m and a basis weight of 14 gsm. This resulted in a three-layered first laminate having a meltblown web and a spunbond web laminated on both main surfaces of the meltblown web.
  • the method for measuring the MFR of propylene homopolymer was in accordance with ASTM D-1238, and the measurement conditions were 230°C and a load of 2.16 kg.
  • the obtained first laminate was integrated with a hot embossing roll with an embossed area ratio of 12%, with the embossing roll temperature set at 155°C and the mirror roll temperature set at 160°C, to obtain a second laminate with a three-layer structure.
  • the second laminate had a meltblown nonwoven fabric layer and a spunbond nonwoven fabric layer laminated on both main surfaces of the meltblown nonwoven fabric layer.
  • the basis weight of the second laminate was 30 gsm.
  • the dust-proof material has a meltblown nonwoven fabric layer and a spunbond nonwoven fabric layer laminated and fixed to both main surfaces of the meltblown nonwoven fabric layer.
  • Average fiber diameter ( ⁇ m) of MB layer fibers A photograph of the meltblown nonwoven fabric layer was taken at a magnification of 1000 times using an electron microscope (Hitachi S-3500N). Among the multiple fibers constituting the meltblown nonwoven fabric layer, 100 fibers were arbitrarily selected, and the width (diameter) of the selected fibers was measured. The average of the measured values was taken as the average fiber diameter of the fibers of the MB layer.
  • Thickness (mm) The thickness of the sample at five points in the center and four corners for which the basis weight was measured was measured with a thickness meter (manufactured by PEACOCK, product number "R1-250", measuring probe 25 mm ⁇ ) under a load of 7 g/ cm2 . The thickness of ten samples for which the basis weight was measured was measured by this method, and the average value was taken as the thickness (mm).
  • Embossing ratio and embossing area ratio (%) The embossing ratio was measured at three points according to the following procedure, and the average value was taken as the embossing ratio.
  • an observation image is taken. The area ratio of the film-formed portion in a 50 mm ⁇ 50 mm square of the observation image is measured as the embossing ratio.
  • Collection efficiency (%) The collection efficiency of the dust-proof material was measured by the following method. Three samples of 15 cm x 15 cm were taken from any part of the dust-proof material, and the collection efficiency of each sample was measured using a collection performance measuring device (Tokyo Dylec Co., Ltd., Model 8130). In measuring the collection efficiency, NaCl particle dust with a number median diameter of 0.07 ⁇ m was generated by an atomizer, and then the sample was set in a holder, and the air volume was adjusted with a flow control valve so that the filter passing speed was 5.3 cm/sec, and the dust concentration was stabilized in the range of 15 mg/m 3 to 20 mg/m 3. The number median diameter indicates the diameter corresponding to a cumulative probability of 50% in the number distribution.
  • PP-SMS refers to a three-layer structure in which a spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a spunbond nonwoven fabric layer are laminated and fixed in that order.
  • Collection efficiency/basis weight of MB layer refers to the ratio of collection efficiency to the basis weight of the meltblown nonwoven fabric layer.
  • Collection efficiency/basis weight of MB layer/average fiber diameter of MB layer refers to the “collection efficiency/basis weight of MB layer” per 1 ⁇ m of the average fiber diameter of the fibers that make up the meltblown nonwoven fabric.
  • Comparative Examples 1 to 4 the MB content was not within the range of 3% or more and less than 10%. Therefore, the ratio of collection efficiency to basis weight of the meltblown nonwoven fabric layer was less than 15.0%/gsm. Furthermore, the air permeability (ccs) of Comparative Examples 1 to 3 was less than 35 ccs. As a result, it was found that the dust-proof materials of Comparative Examples 1 to 4 have a high ratio of collection efficiency to basis weight of the electretized meltblown nonwoven fabric layer, but are not dust-proof materials with excellent air permeability.
  • the MB content was in the range of 3% or more and less than 10%.
  • the total basis weight of the dust-proof material was in the range of 15 gsm or more and less than 55 gsm. Therefore, the ratio of the collection efficiency to the basis weight of the meltblown nonwoven fabric layer was 15.0%/gsm or more.
  • the air permeability (ccs) was in the range of 35 ccs to 200 ccs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

Le matériau anti-poussière divulgué comprend une couche de tissu non tissé obtenu par fusion-soufflage qui a été conçue sous la forme d'un électret, et une couche de tissu non tissé filé-lié qui est stratifiée sur les deux surfaces principales de la couche de tissu non tissé obtenu par fusion-soufflage et fixée à celles-ci. La couche de tissu non tissé obtenu par fusion-soufflage contient un tissu non tissé obtenu par fusion-soufflage. La couche de tissu non tissé filé-lié contient un tissu non tissé filé-lié. Le grammage du matériau anti-poussière est supérieur ou égal à 15 gsm et inférieur à 55 gsm. Le rapport entre le grammage de la couche de tissu non tissé obtenu par fusion-soufflage et le grammage du matériau anti-poussière est supérieur ou égal à 3 % et inférieur à 10 %.
PCT/JP2024/003122 2023-01-31 2024-01-31 Matériau anti-poussière, vêtement de protection et procédé de production d'un matériau anti-poussière WO2024162401A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001226860A (ja) * 2000-02-14 2001-08-21 Toyobo Co Ltd 粒子含有不織布およびその製造方法
JP2003293253A (ja) * 2002-04-01 2003-10-15 Toyobo Co Ltd 粒子含有不織布
WO2016104492A1 (fr) * 2014-12-26 2016-06-30 東レ株式会社 Vêtement de protection
JP2017075427A (ja) * 2015-10-15 2017-04-20 旭化成株式会社 柔軟性を有するスパンボンド不織布
WO2019059203A1 (fr) * 2017-09-22 2019-03-28 東レ株式会社 Matériau de vêtement de protection
WO2021153296A1 (fr) * 2020-01-27 2021-08-05 東レ株式会社 Tissu non tissé à électret multicouches, et unité de filtre à air et purificateur d'air l'utilisant
JP2022061600A (ja) * 2020-10-07 2022-04-19 東レ株式会社 防護服

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001226860A (ja) * 2000-02-14 2001-08-21 Toyobo Co Ltd 粒子含有不織布およびその製造方法
JP2003293253A (ja) * 2002-04-01 2003-10-15 Toyobo Co Ltd 粒子含有不織布
WO2016104492A1 (fr) * 2014-12-26 2016-06-30 東レ株式会社 Vêtement de protection
JP2017075427A (ja) * 2015-10-15 2017-04-20 旭化成株式会社 柔軟性を有するスパンボンド不織布
WO2019059203A1 (fr) * 2017-09-22 2019-03-28 東レ株式会社 Matériau de vêtement de protection
WO2021153296A1 (fr) * 2020-01-27 2021-08-05 東レ株式会社 Tissu non tissé à électret multicouches, et unité de filtre à air et purificateur d'air l'utilisant
JP2022061600A (ja) * 2020-10-07 2022-04-19 東レ株式会社 防護服

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