WO2024005146A1 - メルトブローン不織布、積層体、マスク用フィルター、及び、マスク - Google Patents

メルトブローン不織布、積層体、マスク用フィルター、及び、マスク Download PDF

Info

Publication number
WO2024005146A1
WO2024005146A1 PCT/JP2023/024192 JP2023024192W WO2024005146A1 WO 2024005146 A1 WO2024005146 A1 WO 2024005146A1 JP 2023024192 W JP2023024192 W JP 2023024192W WO 2024005146 A1 WO2024005146 A1 WO 2024005146A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
melt
poly
hydroxyalkanoate
fibers
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/024192
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
仁志 島本
貴幸 宮本
武和 前田
正信 田村
俊介 大谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaneka Corp
Original Assignee
Kaneka Corp
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 Kaneka Corp filed Critical Kaneka Corp
Priority to CN202380037962.1A priority Critical patent/CN119137322A/zh
Priority to EP23831585.7A priority patent/EP4549643A4/en
Priority to US18/871,887 priority patent/US20250327225A1/en
Priority to JP2024530967A priority patent/JPWO2024005146A1/ja
Publication of WO2024005146A1 publication Critical patent/WO2024005146A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • D04H1/565—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres by melt-blowing
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • 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
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • 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
    • D04H3/009—Condensation or reaction polymers
    • D04H3/011—Polyesters
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0622—Melt-blown
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1291—Other parameters
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • the present invention relates to a meltblown nonwoven fabric, a laminate, a mask filter, and a mask.
  • Meltblown nonwoven fabric is a nonwoven fabric obtained by a meltblown method in which a polymer and hot air are discharged together from a spinneret. Moreover, the meltblown nonwoven fabric has a microporous structure.
  • Melt-blown nonwoven fabrics can be used, for example, as removal filters (a concept that also includes mask filters, filtration filters, etc.) that remove particles (e.g., particles with viruses, pollen, etc.), blood filters that collect blood cells, and beverage extraction filters. (for example, coffee drip filters, tea bags, etc.), etc. (for example, Patent Document 1).
  • fibers constituting the nonwoven fabric fibers containing poly(3-hydroxyalkanoate) resin, which is a biodegradable resin, are used from the viewpoint of suppressing the burden on the global environment (for example, Patent Document 2 ).
  • melt-blown nonwoven fabrics are required to have high efficiency in trapping particles (for example, particles to which blood cells, pollen, coffee powder, tea leaves, viruses, etc. are attached). For this reason, with regard to melt-blown nonwoven fabrics, particle collection efficiency has been improved by charging the nonwoven fabrics with corona discharge. However, techniques other than charging processing to increase the particle collection efficiency of melt-blown nonwoven fabrics have not been sufficiently investigated.
  • Meltblown nonwoven fabrics may also be required to be resistant to tearing.
  • an object of the present invention is to provide a meltblown nonwoven fabric that is hard to tear and has high particle collection efficiency.
  • Another object of the present invention is to provide a laminate including the meltblown nonwoven fabric, a mask filter formed of the meltblown nonwoven fabric or the laminate, and a mask including the mask filter.
  • the first aspect of the present invention is a meltblown nonwoven fabric containing fibers,
  • the fiber is formed from a resin composition containing a poly(3-hydroxyalkanoate) resin,
  • the poly(3-hydroxyalkanoate)-based resin includes a copolymer having 3-hydroxybutyrate units,
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 80.0 mol% or more and 93.5 mol% or less
  • the present invention relates to a meltblown nonwoven fabric in which the fibers have an average fiber diameter of 8.0 ⁇ m or less.
  • a second aspect of the present invention is a laminate comprising a first nonwoven fabric and a second nonwoven fabric laminated on at least one side of the first nonwoven fabric, the first nonwoven fabric is the meltblown nonwoven fabric,
  • the present invention relates to a laminate, wherein the second nonwoven fabric is a nonwoven fabric containing cellulose fibers.
  • a third aspect of the present invention relates to a mask filter formed of the melt-blown nonwoven fabric or the laminate.
  • a fourth aspect of the present invention relates to a mask comprising a mask body and the mask filter.
  • meltblown nonwoven fabric that is hard to tear and has high particle collection efficiency.
  • a laminate including the meltblown nonwoven fabric, a mask filter formed of the meltblown nonwoven fabric or the laminate, and a mask including the mask filter there can be provided.
  • FIG. 1 Schematic diagram of a melt-blown nonwoven fabric manufacturing apparatus.
  • the meltblown nonwoven fabric according to this embodiment contains fibers.
  • the fibers are made of a resin composition containing a poly(3-hydroxyalkanoate) resin.
  • the poly(3-hydroxyalkanoate) resin includes a copolymer having 3-hydroxybutyrate units.
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 80.0 mol% or more and 93.5 mol% or less.
  • the average fiber diameter of the fibers is 8.0 ⁇ m or less.
  • the meltblown nonwoven fabric according to this embodiment is a nonwoven fabric obtained by a meltblown method.
  • the concept of the melt-blown nonwoven fabric according to the present embodiment includes a nonwoven fabric obtained by the spun-blown (registered trademark) method.
  • the resin composition contains a polymer component. Moreover, the resin composition may further contain an additive.
  • the polymer component contains a poly(3-hydroxyalkanoate) resin.
  • the polymer component may contain other polymers in addition to the poly(3-hydroxyalkanoate) resin.
  • the poly(3-hydroxyalkanoate) resin is a polyester containing 3-hydroxyalkanoic acid as a monomer. That is, the poly(3-hydroxyalkanoate) resin is a resin containing 3-hydroxyalkanoic acid as a structural unit. Further, the poly(3-hydroxyalkanoate) resin is a biodegradable polymer.
  • biodegradability in this embodiment refers to a property that can be decomposed into low molecular weight compounds by microorganisms in the natural world. Specifically, we use ISO 14855 (compost) and ISO 14851 (activated sludge) for aerobic conditions, and ISO 14853 (aqueous phase) and ISO 15985 (solid phase) for anaerobic conditions. The presence or absence of degradability can be determined. Furthermore, the degradability of microorganisms in seawater can be evaluated by measuring biochemical oxygen demand.
  • the poly(3-hydroxyalkanoate) resin includes a copolymer having 3-hydroxybutyrate units.
  • monomer units other than 3-hydroxybutyrate units include, for example, hydroxyalkanoate units other than 3-hydroxybutyrate units.
  • hydroxyalkanoate units other than 3-hydroxybutyrate units include 3-hydroxyhexanoate, 3-hydroxyoctanoate, 3-hydroxyoctadecanoate, 3-hydroxyvalerate, and 4-hydroxybutyrate. Examples include.
  • Copolymers having 3-hydroxybutyrate units include P3HB3HH, P3HB3HV, P3HB4HB, poly(3-hydroxybutyrate-co-3-hydroxyoctanoate), poly(3-hydroxybutyrate-co-3- Hydroxyoctadecanoate) and the like.
  • P3HB3HH means poly(3-hydroxybutyrate-co-3-hydroxyhexanoate).
  • P3HB3HV means poly(3-hydroxybutyrate-co-3-hydroxyvalerate).
  • P3HB4HB means poly(3-hydroxybutyrate-co-4-hydroxybutyrate).
  • the poly(3-hydroxyalkanoate) resin may contain only one type of copolymer having 3-hydroxybutyrate units, or may contain two or more types. As the copolymer having 3-hydroxybutyrate units, P3HB3HH is preferred.
  • the resin composition preferably contains a copolymer having 3-hydroxybutyrate units in an amount of 50% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass or more.
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 80.0 mol% or more and 93.5 mol% or less, preferably 82.0 mol or more and 93.0 mol% or less, or more. Preferably it is 85.0 mol or more and 91.6 mol or less.
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 80.0 mol % or more, the rigidity of the fiber becomes high.
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 93.5 mol% or less, the meltblown nonwoven fabric according to the present embodiment is difficult to tear.
  • the melt-blown nonwoven fabric according to the present embodiment is less likely to become fluffy.
  • the content ratio of the 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate)-based resin is the 3-hydroxybutyrate unit content in the entire poly(3-hydroxyalkanoate)-based resin contained in the nonwoven fabric. Means the content ratio of units.
  • the first reaction liquid is cooled, 1.5 g of sodium hydrogen carbonate is added little by little to the cooled first reaction liquid to neutralize it, and the second reaction liquid is left to stand until the generation of carbon dioxide gas stops.
  • a reaction solution is obtained.
  • a mixture is obtained by thoroughly mixing the second reaction solution and 4 mL of diisopropyl ether. Next, the mixture is centrifuged to obtain a supernatant. Then, the content ratio of 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate)-based resin is determined by analyzing the monomer unit composition of the decomposed product in the supernatant liquid by capillary gas chromatography under the following conditions. .
  • the content ratio of 3-hydroxybutyrate units in the entire poly(3-hydroxyalkanoate)-based resin contained in the raw material composition is determined by adjusting the content ratio of 3-hydroxybutyrate units in the entire poly(3-hydroxyalkanoate) resin contained in the raw material composition (the “raw material composition” will be described later). It may also be the content ratio of 3-hydroxybutyrate units in the 3-hydroxyalkanoate)-based resin.
  • the poly(3-hydroxyalkanoate) resin has a content of 3-hydroxybutyrate units of 76 mol% or less. It is preferable that a resin component is included.
  • the content of 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate) resin component is 0 to 76 mol%, preferably 1 to 76 mol%, and more preferably 50 to 76 mol%.
  • Examples of the poly(3-hydroxyalkanoate) resin component include poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), poly(3-hydroxybutyrate-co-4-hydroxybutyrate), etc. is preferred.
  • MIBK fractionation method The fact that the poly(3-hydroxyalkanoate)-based resin contains the poly(3-hydroxyalkanoate)-based resin component can be achieved by, for example, a solvent fractionation method using the difference in solubility in methyl isobutyl ketone (MIBK). (Also referred to as "MIBK fractionation method.") That is, poly(3-hydroxyalkanoate)-based resin is fractionated into an MIBK-soluble fraction and an MIBK-insoluble fraction by the MIBK fractionation method, and the content ratio of 3-hydroxybutyrate units in either fraction is 76. If the amount is mol % or less, it can be confirmed that the poly(3-hydroxyalkanoate)-based resin contains the poly(3-hydroxyalkanoate)-based resin component.
  • MIBK fractionation method a solvent fractionation method using the difference in solubility in methyl isobutyl ketone
  • the specific fractionation procedure is described below. First, measure approximately 100 mg of poly(3-hydroxyalkanoate) resin into a screw cap test tube, add 10 ml of MIBK, and close the cap. Thereafter, the mixture is heated at 140° C. for about 1 to 3 hours with shaking to completely dissolve the poly(3-hydroxyalkanoate) resin. After complete dissolution, leave the solution at 25° C. for 1 minute to lower the temperature below the boiling point, immediately transfer all the dissolved solution to a pre-weighed centrifuge tube, and close the cap. The capped centrifuge tube is left at 25° C. for an additional 15 minutes to precipitate a portion of the lysate.
  • the precipitate and the solution are separated by centrifugation (9000 rpm, 5 minutes), and all the solution is transferred to an aluminum cup whose weight has been measured in advance.
  • the aluminum cup is heated at 120° C. for 30 minutes to volatilize MIBK and precipitate the melt. Further, the precipitate remaining in the aluminum cup and the precipitate remaining in the centrifuge tube are each vacuum-dried at 100° C. for 6 hours.
  • the precipitate remaining in the aluminum cup is weighed as the MIBK-soluble fraction, and the precipitate remaining in the centrifuge tube is weighed as the MIBK-insoluble fraction. Confirm that the difference between the total weight of the MIBK soluble fraction and the MIBK insoluble fraction and the initially measured weight of the poly(3-hydroxyalkanoate) resin is within ⁇ 3%.
  • the content ratio of 3-hydroxybutyrate units in each of the MIBK soluble fraction and MIBK insoluble fraction can be measured by the method described above.
  • the content of 3-hydroxybutyrate units in either the MIBK-soluble fraction or the MIBK-insoluble fraction is preferably 0 to 76 mol%, more preferably 1 to 76 mol%, and still more preferably 50 to 76 mol%. It is 76 mol%.
  • poly(3-hydroxyalkanoate) resins other than copolymers having 3-hydroxybutyrate units examples include P3HB, poly(3-hydroxyvalerate), poly(3-hydroxyhexanoate), etc. Can be mentioned.
  • P3HB means poly(3-hydroxybutyrate) which is a homopolymer.
  • P3HB has a function of promoting crystallization of P3HB itself and poly(3-hydroxyalkanoate) resins other than P3HB.
  • the other polymer is biodegradable.
  • biodegradable polymers examples include polycaprolactone, polylactic acid, polybutylene succinate, polybutylene succinate adipate, polybutylene adipate terephthalate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, unmodified starch, Examples include modified starch, cellulose acetate, chitosan, and the like.
  • the polycaprolactone is a polymer obtained by ring-opening polymerization of ⁇ -caprolactone.
  • the resin composition may contain one type of other polymer, or may contain two or more types of other polymers.
  • the melt-blown non-woven fabric according to the present embodiment contains a biodegradable polymer, so even if the melt-blown non-woven fabric is disposed of in the environment, it easily decomposes in the environment, thereby reducing the burden on the environment. be able to.
  • the resin composition may further contain an additive.
  • additives include crystal nucleating agents, lubricants, stabilizers (antioxidants, ultraviolet absorbers, etc.), colorants (dyes, pigments, etc.), plasticizers, inorganic fillers, organic fillers, antistatic agents, etc. can be mentioned.
  • the resin composition preferably contains a crystal nucleating agent as an additive.
  • the crystal nucleating agent is a compound that can promote crystallization of poly(3-hydroxyalkanoate) resin. Further, the crystal nucleating agent has a higher melting point than the poly(3-hydroxyalkanoate) resin.
  • crystal nucleating agent examples include inorganic substances (e.g., boron nitride, titanium oxide, talc, layered silicates, calcium carbonate, sodium chloride, metal phosphates, etc.); sugar alcohol compounds derived from natural products (e.g., pentane, etc.); Erythritol, erythritol, galactitol, mannitol, arabitol, etc.); polyvinyl alcohol; chitin; chitosan; polyethylene oxide; aliphatic carboxylate; aliphatic alcohol; aliphatic carboxylic acid ester; dicarboxylic acid derivative (e.g.
  • inorganic substances e.g., boron nitride, titanium oxide, talc, layered silicates, calcium carbonate, sodium chloride, metal phosphates, etc.
  • sugar alcohol compounds derived from natural products e.g., pentane, etc.
  • sorbitol derivatives e.g., (bisbenzylidene sorbitol, bis(p-methylbenzylidene) sorbitol, etc.
  • Compounds containing a nitrogen-containing heteroaromatic nucleus e.g., pyridine ring, triazine ring, imidazole ring, etc.
  • Phosphoric acid Examples include ester compounds; bisamides of higher fatty acids; metal salts of higher fatty acids; and branched polylactic acids. Note that P3HB, which is the poly
  • the crystal nucleating agent from the viewpoint of improving the crystallization rate of the poly(3-hydroxyalkanoate)-based resin, and from the viewpoint of compatibility and affinity with the poly(3-hydroxyalkanoate)-based resin, Sugar alcohol compounds, polyvinyl alcohol, chitin, and chitosan are preferred. Furthermore, among the sugar alcohol compounds, pentaerythritol is preferred.
  • the crystal nucleating agent preferably has a crystal structure at room temperature (25° C.). Since the crystal nucleating agent has a crystal structure at room temperature (25° C.), there is an advantage that crystallization of the poly(3-hydroxyalkanoate) resin is further promoted. Further, the crystal nucleating agent having a crystal structure at room temperature (25°C) is preferably in a powder form at room temperature (25°C). Furthermore, the average particle diameter of the crystal nucleating agent that is in powder form at room temperature (25° C.) is preferably 10 ⁇ m or less.
  • the resin composition preferably contains 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, and still more preferably 0. Contains .5 parts by mass or more.
  • a crystal nucleating agent based on 100 parts by mass of poly(3-hydroxyalkanoate) resin
  • poly(3-hydroxyalkanoate) can be used when producing a melt-blown nonwoven fabric by the melt-blown method.
  • -Hydroxyalkanoate) type resin is more likely to be crystallized.
  • the resin composition preferably contains a crystal nucleating agent at 2.5 parts by mass or less, more preferably at most 2.0 parts by mass, based on 100 parts by mass of the poly(3-hydroxyalkanoate) resin.
  • the resin composition contains 2.5 parts by mass or less of a crystal nucleating agent based on 100 parts by mass of poly(3-hydroxyalkanoate) resin, fibers can be easily obtained when producing a melt-blown nonwoven fabric by a melt-blown method. This has the advantage of being easier.
  • P3HB is a poly(3-hydroxyalkanoate)-based resin and can also function as a crystal nucleating agent
  • the amount of P3HB is It is included in both the amount of the hydroxyalkanoate (hydroxyalkanoate) resin and the amount of the crystal nucleating agent.
  • the resin composition contains the lubricant.
  • the fibers When a melt blown nonwoven fabric is produced by the melt blown method, the fibers contain a lubricant, which improves the lubricity of the fibers and suppresses fusion between the fibers.
  • the resin composition does not contain a lubricant or contains a very small amount of a lubricant, there are advantages such as improved tape adhesion of the nonwoven fabric and ease of handling in the process of manufacturing the nonwoven fabric. be.
  • a lubricant include compounds having an amide bond.
  • the compound having an amide bond preferably contains one or more selected from lauric acid amide, myristic acid amide, stearic acid amide, behenic acid amide, and erucic acid amide.
  • the content of the lubricant in the resin composition is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.5 parts by mass or more, based on 100 parts by mass of the polymer component.
  • the content of the lubricant in the resin composition is 0.05 parts by mass or more per 100 parts by mass of the polymer component, it is possible to further suppress fusion between fibers when producing a melt-blown nonwoven fabric by a melt-blown method. It has the advantage of being possible.
  • the content of the lubricant in the resin composition is 0 to 0.2 parts by mass based on 100 parts by mass of the polymer component, the tape adhesion of the nonwoven fabric improves, making it easier to handle during the manufacturing process of the nonwoven fabric.
  • the content of the lubricant in the resin composition is preferably 12 parts by mass or less, more preferably 10 parts by mass or less, even more preferably 8 parts by mass or less, and most preferably 5 parts by mass or less, based on 100 parts by mass of the polymer component. .
  • the content of the lubricant in the resin composition is 12 parts by mass or less per 100 parts by mass of the polymer component, there is an advantage that the lubricant can be prevented from bleeding out onto the surface of the fibers.
  • the melt mass flow rate (MFR) of the resin composition at 165° C. is preferably 50 to 1500 g/10 min, more preferably 70 to 1500 g/10 min, even more preferably 80 to 1300 g/10 min, particularly preferably 80 to 1200 g/10 min. It is 10 minutes.
  • melt mass flow rate at 165° C. of the resin composition in the fiber is 1500 g/10 min or less
  • the strength and elongation of the melt blown nonwoven fabric are increased.
  • the melt mass flow rate at 165° C. of the resin composition in the fibers is 50 g/10 min or more
  • the tension applied to the fibrous melt during stretching can be lowered, and the fibers in the resulting melt-blown nonwoven fabric can be lowered. This makes it easier to reduce the fiber diameter. As a result, it becomes easier to increase the particle collection efficiency of the melt-blown nonwoven fabric.
  • melt mass flow rate (MFR) of the resin composition at 165°C the melt volume flow rate (MFR) of the resin composition at 165°C is determined by method B of ASTM-D1238 (ISO1133-1, JIS K7210-1:2011).
  • the melt mass flow rate (MFR) of the resin composition at 165°C is determined from the melt volume flow rate (MVR) of the resin composition at 165°C and the density of the resin composition. Further, the melt volume flow rate (MVR) at 165° C. of the resin composition is measured by heating 5 g or more of the resin composition at 165° C. for 4 minutes, and then applying a load of 5 kg to the heated resin composition.
  • the weight average molecular weight of the resin composition is preferably 100,000 to 250,000, more preferably 110,000 to 200,000, and even more preferably 110,000 to 180,000.
  • the weight average molecular weight of the resin composition in the fiber is 100,000 or more
  • the strength and elongation of the meltblown nonwoven fabric are increased.
  • the tension applied to the fibrous melt during drawing can be lowered, and the fiber diameter of the fibers in the resulting melt-blown nonwoven fabric can be reduced. It becomes easier to make it thinner. As a result, it becomes easier to increase the particle collection efficiency of the melt-blown nonwoven fabric.
  • the weight average molecular weight in this embodiment is measured from polystyrene equivalent molecular weight distribution using gel permeation chromatography (GPC) using a chloroform eluent.
  • GPC gel permeation chromatography
  • a column in the GPC a column suitable for measuring the molecular weight may be used.
  • the average fiber diameter of the fibers is 8.0 ⁇ m or less, preferably 5.0 ⁇ m or less, more preferably 3.3 ⁇ m or less, even more preferably 3.0 ⁇ m or less. Further, the average fiber diameter of the fibers is preferably 0.50 to 8.0 ⁇ m, more preferably 0.50 to 5.0 ⁇ m, still more preferably 0.50 to 3.3 ⁇ m, and even more preferably 0.50 to 5.0 ⁇ m. 50 to 3.0 ⁇ m, particularly preferably 0.80 to 2.8 ⁇ m, particularly preferably 1.0 to 2.6 ⁇ m.
  • the coefficient of variation of the fiber diameter of the fiber is preferably 0.40 or less, more preferably 0.36 or less, and even more preferably 0.32 or less. Further, the coefficient of variation of the fiber diameter of the fiber is, for example, 0.10 or more.
  • the average fiber diameter of the fibers When the average fiber diameter of the fibers is 8.0 ⁇ m or less, the particle collection efficiency of the melt-blown nonwoven fabric increases. When the average fiber diameter of the fibers is 0.50 ⁇ m or more, the strength and elongation of the meltblown nonwoven fabric are increased. When the coefficient of variation of the fiber diameter of the fibers is 0.40 or less, the number of extremely thick fibers is reduced, and as a result, the efficiency of particle collection by the melt-blown nonwoven fabric is further increased. Further, since the coefficient of variation of the fiber diameter of the fibers is 0.40 or less, the number of extremely thin fibers is reduced, and as a result, the strength and elongation of the meltblown nonwoven fabric are increased.
  • the basis weight of the meltblown nonwoven fabric according to this embodiment is preferably 20 to 80 g/m 2 , more preferably 25 to 77 g/m 2 , and even more preferably 30 to 75 g/m 2 .
  • the basis weight of the meltblown nonwoven fabric according to the present embodiment is preferably 20 to 80 g/m 2 , more preferably 25 to 77 g/m 2 , and even more preferably 30 to 75 g/m 2 .
  • the basis weight of the meltblown nonwoven fabric according to this embodiment can be determined as follows. First, a test piece is obtained from the meltblown nonwoven fabric according to this embodiment. The size of the test piece can be, for example, 100 mm x 100 mm, 200 mm x 200 mm, etc. Next, the weight of the test piece is measured using an electronic balance or the like. Then, the basis weight is calculated by dividing the weight of the test piece by the area of the test piece.
  • the thickness of the meltblown nonwoven fabric according to this embodiment is preferably 0.10 to 0.40 mm, more preferably 0.15 to 0.35 mm. Since the thickness of the melt blown nonwoven fabric according to this embodiment is 0.10 to 0.40 mm, it becomes easier to obtain a homogeneous melt blown nonwoven fabric when producing the melt blown nonwoven fabric. Moreover, by having a thickness of the melt-blown non-woven fabric according to the present embodiment of 0.10 mm or more, the strength and elongation of the melt-blown non-woven fabric are increased, and the efficiency of collecting particles by the melt-blown non-woven fabric is further increased. Furthermore, since the thickness of the melt blown nonwoven fabric according to this embodiment is 0.40 mm or less, the liquid permeability (water permeability, etc.) or air permeability of the melt blown nonwoven fabric can be improved.
  • the thickness of the melt-blown non-woven fabric can be measured at three or more locations using a thickness meter, and the arithmetic mean value thereof can be taken as the thickness of the melt-blown non-woven fabric.
  • the thickness gauge include "PEACOCK” manufactured by Ozaki Seisakusho Co., Ltd.
  • the average pore diameter of the meltblown nonwoven fabric according to the present embodiment is preferably 2.5 ⁇ m or more and 10.0 ⁇ m or less, more preferably 3.0 ⁇ m or more and 7.0 ⁇ m or less.
  • the average pore diameter of the melt-blown nonwoven fabric according to this embodiment is 2.5 ⁇ m or more, the liquid permeability (water permeability, etc.) or air permeability of the melt-blown nonwoven fabric can be improved. Since the average pore diameter of the melt-blown non-woven fabric according to this embodiment is 10.0 ⁇ m or less, the efficiency of particle collection by the melt-blown non-woven fabric is further increased.
  • the average pore diameter of the melt-blown nonwoven fabric according to the present embodiment is the average flow pore diameter determined according to JIS K3832-1990 "Bubble point test method for microfiltration membrane elements and modules.”
  • the average flow pore diameter can be measured using, for example, a palm porometer (manufactured by PMI).
  • the tensile elongation at break in the MD direction (also simply referred to as "MD elongation") of the meltblown nonwoven fabric according to the present embodiment is preferably 50% or more, more preferably 100% or more, still more preferably 120% or more, especially Preferably it is 150% or more.
  • the MD elongation of the meltblown nonwoven fabric according to this embodiment is, for example, 500% or less.
  • the meltblown nonwoven fabric according to the present embodiment is difficult to tear even when stretched in the MD direction.
  • MD elongation tends to increase.
  • the tensile elongation at break in the CD direction (also simply referred to as "CD elongation") of the melt-blown nonwoven fabric according to the present embodiment is preferably 50% or more, more preferably 100% or more, still more preferably 120% or more, especially Preferably it is 150% or more.
  • the CD elongation of the meltblown nonwoven fabric according to this embodiment is, for example, 500% or less.
  • the CD elongation is 50% or more, the meltblown nonwoven fabric according to the present embodiment is difficult to tear even when stretched in the CD direction.
  • the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin By controlling the content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin to 93.5 mol% or less, the CD elongation can be easily increased.
  • the melt blown nonwoven fabric has a tensile elongation at break in the MD direction of 120% or more, and the melt blown nonwoven fabric has a tensile elongation at break in the CD direction of 120% or more, making the melt blown nonwoven fabric even more difficult to tear. .
  • the MD direction is a direction (Machine Direction) in which the melt blown nonwoven fabric moves when manufacturing the melt blown nonwoven fabric.
  • the CD direction is a direction perpendicular to the MD direction.
  • Tensile elongation at break is also called tensile elongation at break.
  • the ratio of the tensile elongation at break in the CD direction of the melt blown nonwoven fabric to the tensile elongation at break in the MD direction of the melt blown nonwoven fabric is preferably 0.50 to 2.00, or more. Preferably it is 0.56 to 1.80. Since the CD elongation/MD elongation is 0.50 to 2.00, when stress is applied to the melt blown nonwoven fabric according to the present embodiment, the melt blown nonwoven fabric can be moved only in either the CD direction or the MD direction. Stress concentration is suppressed, and as a result, the meltblown nonwoven fabric becomes difficult to tear.
  • the CD elongation/MD elongation is 0.50 to 2.00. It will be easier to fall within the range.
  • the tensile elongation at break can be measured using a constant speed extension type tensile testing machine that complies with JIS B7721:2018 "Tensile testing machine/compression testing machine - Calibration method and verification method of force measurement system".
  • a constant speed extension type tensile testing machine a universal testing machine (RTG-1210 manufactured by A&D Co., Ltd.) or the like can be used.
  • the tensile elongation at break can be determined as follows. First, a test piece (width: 8 mm, length: 40 mm) is cut out from a melt-blown nonwoven fabric.
  • the test piece is attached to a constant speed extension type tensile tester with an initial load at a grip interval of 20 mm.
  • the gripping interval when the initial load is applied to the test piece is 20 mm.
  • the test piece should be pulled by hand to the extent that no slack occurs.
  • a load is applied at a tensile speed of 20 mm/min until the test piece breaks.
  • the tensile elongation at break is determined using the following formula.
  • Tensile elongation at break (%) [(grabbing interval at break - gripping interval when the initial load is applied to the test piece) / gripping interval when the initial load is applied to the test piece] x 100 (%)
  • the melt-blown nonwoven fabric according to this embodiment can be suitably used, for example, as a material for a filter.
  • the filters include removal filters (e.g., mask filters) that remove particles (e.g., particles with viruses and the like, pollen, etc.), blood filters that collect blood cells, and beverage extraction filters (e.g., coffee drip filters). filters, tea bags, etc.).
  • melt-blown nonwoven fabrics according to the present embodiment may be laminated and used as a material for a filter, etc.
  • the laminate according to this embodiment includes a first nonwoven fabric and a second nonwoven fabric laminated on at least one side of the first nonwoven fabric.
  • the first nonwoven fabric is a meltblown nonwoven fabric according to this embodiment.
  • the second nonwoven fabric includes cellulose fibers.
  • cellulose fibers examples include cotton fibers, rayon (a concept that also includes cupro (also referred to as "copper ammonia rayon”), etc.), acetate fibers, and the like.
  • Such a laminate has a high particle collection efficiency due to the first nonwoven fabric, and a laminate with even higher strength due to the second nonwoven fabric.
  • the second nonwoven fabric examples include spunlace nonwoven fabric.
  • the mask filter according to the present embodiment is formed of the melt-blown nonwoven fabric according to the present embodiment or the laminate according to the present embodiment.
  • the mask according to this embodiment may include a mask body and a mask filter according to this embodiment.
  • the mask main body includes a pair of ear hook parts and a holding part that can hold the mask filter.
  • the mask according to this embodiment may be configured such that the mask filter is detachably attached to the holding portion.
  • the mask body and the mask filter may be integrated.
  • the mask according to this embodiment may be a disposable mask.
  • the mask according to this embodiment may have a structure of two or more layers in which the melt-blown nonwoven fabric according to this embodiment and a base sheet are laminated.
  • the mask according to this embodiment may have a three-layer structure in which a base sheet, a melt-blown nonwoven fabric according to this embodiment, and a base sheet are laminated in this order.
  • the base sheet has fibers.
  • Examples of the base sheet include nonwoven fabrics and woven fabrics.
  • Examples of the fiber material of the base sheet include cellulose fibers, polypropylene fibers (PP fibers), polyethylene terephthalate fibers (PET fibers), polybutylene terephthalate fibers (PBT fibers), etc. .
  • Examples of the cellulose fibers that are the fibers of the base sheet include cotton fibers, rayon (a concept that also includes cupro (also referred to as "copper ammonia rayon"), etc.), acetate fibers, and the like.
  • the fibers of the base sheet may be long fibers or short fibers.
  • nonwoven fabric serving as the base sheet examples include spunbond nonwoven fabric, spunlace nonwoven fabric, and the like.
  • Examples of the woven fabric serving as the base sheet include gauze. Gauze has cotton fibers.
  • nonwoven fabric that is the base sheet containing cellulose fibers
  • nonwoven fabrics produced by a wet short fiber spunbond method examples include TCF (registered trademark) series nonwoven fabrics (manufactured by Futamura Chemical Co., Ltd.).
  • the TCF (registered trademark) series nonwoven fabric is a nonwoven fabric manufactured by the TCF (registered trademark) method.
  • Examples of the fibers constituting the spunlace nonwoven fabric include cellulose fibers, and specifically, rayon fibers.
  • fibers constituting the spunbond nonwoven fabric include polypropylene fibers (PP fibers), polyethylene terephthalate fibers (PET fibers), and polybutylene terephthalate fibers (PBT fibers).
  • PP fibers polypropylene fibers
  • PET fibers polyethylene terephthalate fibers
  • PBT fibers polybutylene terephthalate fibers
  • the mask according to the present embodiment has a three-layer structure in which a spunbond nonwoven fabric, a meltblown nonwoven fabric according to the present embodiment, and a spunbond nonwoven fabric are laminated in this order. It has a three-layer structure.
  • the mask may be an SMS mask.
  • the mask according to this embodiment may include the second nonwoven fabric and/or woven fabric. Furthermore, the mask according to the present embodiment has a three-layer structure in which the second nonwoven fabric or the woven fabric, the melt-blown nonwoven fabric according to the present embodiment, and the second nonwoven fabric or the woven fabric are laminated in this order. You can leave it there. In other words, the mask according to this embodiment may use a second nonwoven fabric and/or a woven fabric instead of the spunbond nonwoven fabric in the SMS mask.
  • the method for manufacturing a meltblown nonwoven fabric according to the present embodiment is a manufacturing method for obtaining the meltblown nonwoven fabric by a meltblowing method.
  • the method for producing a meltblown nonwoven fabric according to the present embodiment includes a step (A) of obtaining a melt by melting a raw material composition by heating, and a step (B) of obtaining a meltblown nonwoven fabric from the melt.
  • the melt blown method is a concept that also includes the spun blown (registered trademark) method.
  • the melt mass flow rate (MFR) of the raw material composition at 165° C. is preferably 30 to 1500 g/10 min, more preferably 30 to 1000 g/10 min, even more preferably 50 to 1000 g/10 min, particularly preferably 50 to 800 g/10 min. It is 10 minutes.
  • melt mass flow rate at 165° C. of the raw material composition is 1500 g/10 min or less
  • strength and elongation of the melt blown nonwoven fabric are further increased.
  • melt mass flow rate of 30 g/10 min or more at 165° C. of the raw material composition the tension applied to the fibrous melt during drawing can be lowered, and the fibers in the resulting melt-blown nonwoven fabric can be reduced. It becomes easier to reduce the diameter. As a result, the particle collection efficiency of the melt-blown nonwoven fabric is further increased.
  • melt mass flow rate (MFR) of the raw material composition at 165°C is determined by method B of ASTM-D1238 (ISO1133-1, JIS K7210-1:2011).
  • the melt mass flow rate (MFR) of the raw material composition at 165° C. is determined from the melt volume flow rate (MVR) of the raw material composition at 165° C. and the density of the raw material composition.
  • the melt volume flow rate (MVR) at 165° C. of the raw material composition is measured by heating 5 g or more of the raw material composition at 165° C. for 4 minutes, and then applying a load of 5 kg to the heated resin composition.
  • the weight average molecular weight of the raw material composition is preferably 100,000 to 350,000, more preferably 110,000 to 300,000, and still more preferably 110,000 to 250,000.
  • the weight average molecular weight of the raw material composition is 100,000 or more
  • the strength and elongation of the meltblown nonwoven fabric are further increased.
  • the tension applied to the fibrous melt during drawing can be lowered, and the fiber diameter of the fibers in the resulting melt-blown nonwoven fabric can be reduced. It becomes easier. As a result, the particle collection efficiency of the melt-blown nonwoven fabric is further increased.
  • a meltblown nonwoven fabric is obtained from the raw material composition using a meltblown nonwoven fabric production apparatus.
  • the melt blown nonwoven fabric manufacturing apparatus 1 includes an extruder 3 that obtains a melt by melting a raw material composition, a hopper 2 that supplies the raw material composition to the extruder 3, and a hopper 2 that supplies the raw material composition to the extruder 3.
  • a kneader 6 that obtains a molten material in a kneaded state (hereinafter also referred to as "kneaded molten material") by kneading materials, a nozzle 7 that discharges the molten kneaded material in the form of fibers, and a fibrous melt-kneaded material.
  • the apparatus includes a collector 8 that collects and cools a first melt-blown nonwoven fabric B to obtain a first melt-blown nonwoven fabric B, and a winding device 9 that winds up the first melt-blown nonwoven fabric B.
  • the melt blown nonwoven fabric manufacturing apparatus 1 may include a gear pump 4 for supplying the melt to the kneader 6, if necessary.
  • the gear pump 4 the melt blown nonwoven fabric manufacturing apparatus 1 can suppress fluctuations in the amount of melt supplied to the kneader 6.
  • melt-blown nonwoven fabric manufacturing apparatus 1 may be provided with a filter 5 for removing foreign substances from the melt on the upstream side of the kneader 6, if necessary.
  • the raw material composition is supplied to the extruder 3 via the hopper 2, and the raw material composition is melted to obtain a melt.
  • the raw material composition supplied to the extruder 3 is preferably in the form of a solid, more preferably in the form of pellets.
  • the raw material composition supplied to the extruder 3 is heated and dried from the viewpoint of suppressing hydrolysis of the resin of the raw material composition and suppressing oxidative deterioration of the resin of the raw material composition.
  • the The amount of water in the raw material composition supplied to the extruder 3 is preferably 200 ppmw or less.
  • the atmosphere during drying is preferably an atmosphere of inert gas (eg, nitrogen gas, etc.).
  • the raw material composition may be dried before being supplied to the hopper 2, or the hopper 2 may be a hopper type dryer and the raw material composition may be dried in the hopper 2. Good too.
  • the extruder 3 examples include a single-screw extruder, a co-direction meshing twin-screw extruder, a co-direction non-meshing twin-screw extruder, a different-direction non-meshing twin-screw extruder, and a multi-screw extruder. It will be done.
  • a single-screw extruder is preferable from the viewpoints that thermal deterioration of the raw material composition during extrusion is easily suppressed due to the small resin retention part in the extruder, and from the viewpoint that equipment costs are low. .
  • the molten material is supplied to the kneader 6 via the filter 5 by the gear pump 4, and the molten material is kneaded by the kneader 6 to obtain a kneaded molten material.
  • the filter 5 examples include a screen mesh, a pleated filter, a leaf disk filter, and the like.
  • a leaf disk type filter is preferable from the viewpoints of filtration accuracy, filtration area, and pressure resistance performance, and from the viewpoint of being less likely to be clogged by foreign matter.
  • a sintered nonwoven fabric of metal fibers can be used as the filter medium of the filter 5, for example.
  • the melted and kneaded material is discharged from the nozzle 7 in the form of fibers.
  • the nozzle 7 is a spinning die head.
  • the nozzle 7 has a plurality of nozzle holes 7a for discharging the melt-kneaded material in the form of fibers.
  • the nozzle 7 discharges a plurality of fibrous melt-kneaded materials A.
  • the nozzle 7 may have only one nozzle hole 7a. That is, the nozzle 7 may discharge only one yarn A.
  • the plurality of nozzle holes 7a are open downward.
  • the shape of the opening of the nozzle hole 7a is, for example, circular (a concept including circular, substantially circular, elliptical, and substantially elliptical).
  • the opening diameter of the nozzle hole 7a is appropriately selected depending on the fiber diameter of the melt-blown nonwoven fabric.
  • the opening diameter of the nozzle hole 7a is preferably 0.05 mm or more, more preferably 0.10 mm or more, and still more preferably 0.12 mm or more. Further, the opening diameter is preferably 1.0 mm or less, more preferably 0.50 mm or less, still more preferably less than 0.30 mm, particularly preferably 0.25 mm or less.
  • the aperture diameter means the arithmetic mean value of the aperture diameters.
  • a plurality of nozzle holes 7a are arranged in a row at intervals.
  • a plurality of nozzle holes 7a are lined up in one row.
  • the number of rows of the plurality of nozzle holes 7a may be two or more.
  • the melt blown method may be a spun blown (registered trademark) method.
  • the distance between adjacent nozzle holes 7a (hereinafter also referred to as "interval") is, for example, preferably 0.05 mm or more, more preferably 0.1 mm or more, and even more preferably 0.25 mm or more.
  • the distance (interval) between adjacent nozzle holes 7a is preferably 1.0 mm or less, more preferably 0.7 mm or less, and even more preferably 0.5 mm or less. Although the distances between adjacent nozzle holes 7a may or may not be equal, it is preferable that the distances be equal in terms of ease of manufacturing a homogeneous melt-blown nonwoven fabric.
  • the distance (interval) between adjacent nozzle holes 7a means the arithmetic average value of the distance (interval) between adjacent nozzle holes 7a.
  • the collector 8 has a collection surface that collects the fibrous kneaded material A.
  • the collector 8 is a conveyor.
  • the conveyor includes a conveyor belt 8a having the collection surface and a plurality of rollers 8b that drive the conveyor belt 8a.
  • the collection surface is arranged directly below the nozzle hole 7a.
  • the conveyor belt 8a has air permeability.
  • the conveyor belt 8a is made of a mesh material. That is, the collection surface has a mesh shape. Note that the collector 8 only needs to have a collector, and instead of the conveyor, it may be a collection drum or a collection net.
  • the distance between the nozzle hole 7a and the collection surface (hereinafter also referred to as "DCD") is preferably 20 mm or more, more preferably 50 mm or more, and still more preferably 80 mm or more. Further, the distance (DCD) between the nozzle hole 7a and the conveyor belt 8a serving as the collecting section is preferably 250 mm or less.
  • the distance (DCD) between the nozzle hole 7a and the collection surface means the arithmetic mean value of the distance (DCD) between the nozzle hole 7a and the collection surface.
  • the melt-blown nonwoven fabric manufacturing apparatus 1 is configured to stretch the fibrous melt-kneaded material A by blowing a high-temperature gas C onto the fibrous melt-kneaded material A.
  • step (B) high-temperature gas C is blown onto the fibrous melt-kneaded material A, and the high-temperature gas C blown onto the molten-kneaded material A is passed through the mesh conveyor belt 8a.
  • the high temperature gas C blown onto the melt-kneaded material A may be sucked by a suction (not shown) in order to make it easier to pass through the mesh conveyor belt 8a. preferable. This makes it easier to prevent the fibers from rebounding on the collecting surface of the mesh-like conveyor belt 8a, and as a result, it becomes easier to form the first meltblown nonwoven fabric B in which the fibers are well fused together.
  • the stretched fibrous melt-kneaded material A is collected by the conveyor belt 8a and cooled while being conveyed by the conveyor belt 8a, thereby obtaining the first melt-blown nonwoven fabric.
  • the material constituting the mesh-like collection surface has heat resistance against the temperature conditions related to the production of the first melt-blown non-woven fabric B, and does not excessively fuse with the first melt-blown non-woven fabric B.
  • the material is not particularly limited as long as B can be peeled off.
  • Examples of the gas C include air and inert gas (nitrogen gas, etc.).
  • Examples of the method of spraying the high temperature gas C include a method of heating the gas C pressurized by a compressor (not shown) with a heater (not shown).
  • the flow rate of the high-temperature gas C that is blown onto the fibrous melt-kneaded material A is preferably 500 NL/min or more, more preferably 1000 NL/min or more, and still more preferably 2000 NL/min or more. Further, the flow rate of the high-temperature gas C that is blown onto the fibrous melt-kneaded material A is preferably 12,000 NL/min or less, more preferably 10,000 NL/min or less.
  • step (B) the temperature and air volume of the high-temperature gas C are appropriately controlled in order to obtain a melt-blown nonwoven fabric with a high degree of crystallinity.
  • the moving speed at which the first melt-blown nonwoven fabric B is moved by the conveyor belt 8a is determined by taking into consideration the discharge amount of the raw material composition and the apparent density of the obtained melt-blown nonwoven fabric B. To be determined accordingly.
  • the moving speed is preferably in a range of 1.0 m/min or more and 6.0 m/min or less.
  • the first melt blown nonwoven fabric B is transferred to the winding device 9 by the conveyor belt 8a, and the first melt blown nonwoven fabric B is wound up into a roll by the winding device 9.
  • the method for producing a meltblown nonwoven fabric according to the present embodiment may include a step (C) of heating the first meltblown nonwoven fabric B obtained in the step (B) to obtain a second meltblown nonwoven fabric. .
  • the method for manufacturing a meltblown nonwoven fabric according to the present embodiment includes the step (C), the second meltblown nonwoven fabric becomes the meltblown nonwoven fabric.
  • the method for manufacturing a meltblown nonwoven fabric according to the present embodiment does not include the step (C), the first meltblown nonwoven fabric becomes the meltblown nonwoven fabric.
  • the nonwoven fabric becomes difficult to tear due to the step (C). Further, in the method for producing a meltblown nonwoven fabric according to the present embodiment, the tensile elongation at break in the CD direction of the meltblown nonwoven fabric and the tensile elongation at break in the MD direction of the meltblown nonwoven fabric can be increased by the step (C). Furthermore, in the method for producing a meltblown nonwoven fabric according to the present embodiment, the fibers are partially fused together in the step (C), and as a result, it becomes easier to suppress fluffing of the meltblown nonwoven fabric.
  • the heating temperature range in step (C) is preferably 80°C to 135°C.
  • the range of heating time within the preferred heating temperature range in step (C) is preferably 2 to 300 minutes, more preferably 5 to 100 minutes, and even more preferably 10 to 50 minutes.
  • the tensile elongation at break in the CD direction of the melt blown nonwoven fabric and the tensile elongation at break in the MD direction of the melt blown nonwoven fabric are increased by heating the first melt blown nonwoven fabric for 2 minutes or more within a preferable heating temperature range. It is possible to further increase the degree of Moreover, in the step (C), the productivity of the second meltblown nonwoven fabric is improved by heating the first meltblown nonwoven fabric within the preferable heating temperature range for 300 minutes or less.
  • the first melt-blown nonwoven fabric may be heated with a gas within the preferable heating temperature range.
  • the gas include air and inert gas (nitrogen gas, etc.).
  • the method of heating the first melt blown nonwoven fabric with a gas within the preferable heating temperature range includes heating the first melt blown nonwoven fabric in a heating furnace with a gas within the preferable heating temperature range, and/or , heating the first melt blown nonwoven fabric by spraying a gas within the preferable heating temperature range onto the first melt blown nonwoven fabric.
  • the first meltblown nonwoven fabric may be heated within the preferable heating temperature range by sandwiching the first meltblown nonwoven fabric between a pair of heating rolls.
  • the step (C) it is preferable to heat the first melt blown nonwoven fabric in a non-contact manner within the preferable heating temperature range.
  • the first melt blown nonwoven fabric when the first melt blown nonwoven fabric is heated while being sandwiched between a pair of heating rolls, there is a concern that the first melt blown nonwoven fabric may be welded to the heating rolls.
  • the first melt blown nonwoven fabric is heated within the preferable heating temperature range without contact with the heating roll etc., thereby suppressing welding of the first melt blown nonwoven fabric to the heating roll etc.
  • Examples of a method of heating the first melt-blown nonwoven fabric in a non-contact manner within the preferable heating temperature range include a method of heating the first melt-blown nonwoven fabric with a gas within the preferable heating temperature range.
  • the first meltblown nonwoven fabric may be heated while it is wound around a roll.
  • the first meltblown nonwoven fabric may be formed into a sheet without being wound into a roll, and the first meltblown nonwoven fabric may be heated.
  • the elongated first melt-blown nonwoven fabric may be heated continuously while being conveyed.
  • a second meltblown nonwoven fabric is obtained by cooling the heated first meltblown nonwoven fabric.
  • the method for cooling the heated first melt-blown nonwoven fabric may be a method of naturally cooling the heated first melt-blown nonwoven fabric at room temperature and normal pressure.
  • the heated first melt-blown nonwoven fabric may be forcibly cooled by blowing the heated first melt-blown nonwoven fabric.
  • a meltblown nonwoven fabric containing fibers The fiber is formed from a resin composition containing a poly(3-hydroxyalkanoate) resin,
  • the poly(3-hydroxyalkanoate)-based resin includes a copolymer having 3-hydroxybutyrate units, The content of the 3-hydroxybutyrate unit in the poly(3-hydroxyalkanoate) resin is 80.0 mol% or more and 93.5 mol% or less,
  • the melt blown nonwoven fabric has a tensile elongation at break in the MD direction of 50% or more,
  • the poly(3-hydroxyalkanoate)-based resin includes any one of items 1 to 7, wherein the poly(3-hydroxyalkanoate)-based resin contains a poly(3-hydroxyalkanoate)-based resin component in which the content of 3-hydroxybutyrate units is 76 mol% or less. Meltblown nonwoven fabric according to item 1.
  • a laminate comprising a first nonwoven fabric and a second nonwoven fabric laminated on at least one side of the first nonwoven fabric,
  • the first nonwoven fabric is the meltblown nonwoven fabric according to any one of items 1 to 8,
  • the laminate, wherein the second nonwoven fabric is a nonwoven fabric containing cellulose fibers.
  • a mask comprising a mask body and the mask filter according to item 10.
  • the present invention is not limited to the above embodiments. Further, the present invention is not limited to the above-described effects. Furthermore, the present invention can be modified in various ways without departing from the gist of the present invention.
  • P3HA Poly(3-hydroxyalkanoate) resin
  • P3HA-1 P3HB3HH (3-hydroxybutyrate unit content: 94.5 mol%, 3-hydroxyhexanoate (3HH) unit content: 5.5 mol%, weight average molecular weight: 390000)
  • P3HA-2 was produced according to the method described in Example 6 of International Publication No. 2021/206155.
  • P3HA-2 P3HB3HH (3-hydroxybutyrate unit content: 85.0 mol%, 3-hydroxyhexanoate (3HH) unit content: 15.0 mol%, weight average molecular weight: 530000)
  • MIBK Weight percentage of soluble fraction 54% by weight, content percentage of 3-hydroxybutyrate units in MIBK soluble fraction: 74.0 mol%, content percentage of 3-hydroxyhexanoate (3HH) units in MIBK soluble fraction : 26.0 mol%)
  • the following P3HA- I got 3.
  • P3HA-3 P3HB3HH (3-hydroxybutyrate unit content: 94.5 mol%, 3-hydroxyhexanoate (3HH) unit content: 5.5 mol%, weight average molecular weight: 200000)
  • P3HA- I got 4.
  • P3HA-4 P3HB3HH (3-hydroxybutyrate unit content: 85.0 mol%, 3-hydroxyhexanoate (3HH) unit content: 15.0 mol%, weight average molecular weight: 220000)
  • the first reaction liquid is cooled, 1.5 g of sodium hydrogen carbonate is added little by little to the cooled first reaction liquid to neutralize it, and the second reaction liquid is left to stand until the generation of carbon dioxide gas stops.
  • a reaction solution was obtained.
  • a mixture was obtained by thoroughly mixing the second reaction solution and 4 mL of diisopropyl ether. Next, the mixture was centrifuged to obtain a supernatant. Then, by analyzing the monomer unit composition of the decomposed product in the supernatant liquid by capillary gas chromatography under the following conditions, the content of 3-hydroxybutyrate units in P3HA-1 and 3-hydroxyhexanoate (3HH ) unit content was determined.
  • the content ratio of 3-hydroxybutyrate units in each of P3HA-2, P3HA-3, and P3HA-4, and the content ratio of 3-hydroxyhexanoate (3HH) units in P3HA-1 are also different from those in P3HA-1. It was determined in the same manner as the content ratio of hydroxybutyrate units and the content ratio of 3-hydroxyhexanoate (3HH) units. Furthermore, P3HA-2 was fractionated into an MIBK-soluble fraction and an MIBK-insoluble fraction using the MIBK fractionation method described above.
  • the content of 3-hydroxybutyrate units and the content of 3-hydroxyhexanoate (3HH) units in the MIBK-soluble fraction and MIBK-insoluble fraction were also determined by the 3-hydroxybutyrate units in P3HA-1. It was determined in the same manner as the content ratio of rate units and the content ratio of 3-hydroxyhexanoate (3HH) units.
  • (Lubricant) BA Behenic acid amide (also referred to as “behenic acid amide”) (manufactured by Nippon Fine Chemical Co., Ltd., BNT-22H)
  • EA Erucic acid amide (manufactured by Nippon Fine Chemical Co., Ltd., Neutron S)
  • PETL Pentaerythritol (manufactured by Taisei Kayaku Co., Ltd., Neurizer P)
  • Examples 1 to 16, 19, 20 and Comparative Examples 1 to 3, 5 A raw material composition was obtained by melting and kneading the above materials at the mixing ratios shown in Table 1 below.
  • the content of 3-hydroxybutyrate units in the entire poly(3-hydroxyalkanoate) resin contained in the raw material composition is the content of 3-hydroxybutyrate units in P3HA-1 and 3-hydroxybutyrate units in P3HA-2.
  • Content ratio of butyrate units, content ratio of 3-hydroxybutyrate units in P3HA-3, content ratio of 3-hydroxybutyrate units in P3HA-4, and P3HA-1 and P3HA-2 and P3HA-3 and P3HA Calculated from the blending ratio with -4.
  • the content ratio of 3-hydroxyhexanoate (3HH) units in the entire poly(3-hydroxyalkanoate)-based resin contained in the raw material composition was calculated in the same manner.
  • the content of 3-hydroxybutyrate units in the entire poly(3-hydroxyalkanoate) resin contained in the raw material composition is the 3-hydroxybutyrate unit content in the entire poly(3-hydroxyalkanoate) resin contained in the melt-blown nonwoven fabric. It also means the content rate of hydroxybutyrate units.
  • the content ratio of 3-hydroxyhexanoate (3HH) units in the entire poly(3-hydroxyalkanoate)-based resin contained in the raw material composition is It also means the content ratio of 3-hydroxyhexanoate (3HH) units in the whole.
  • Table 1 The calculated values are shown in Table 1 below.
  • a first meltblown nonwoven fabric was produced from the raw material composition under the conditions shown in Table 2 below using the meltblown nonwoven fabric production apparatus shown in FIGS. 1 to 3. Note that a nozzle with a width of 600 mm was used to manufacture the first melt-blown nonwoven fabric.
  • the first melt-blown nonwoven fabric was heated under the heating conditions shown in Table 2 below, and then at room temperature and pressure (20°C, 1 atm).
  • room temperature and pressure 20°C, 1 atm
  • Example 17 and 18 and Comparative Example 4 The first meltblown nonwoven fabrics of Examples 1 and 4 and Comparative Example 1 were used as the meltblown nonwoven fabrics of Examples 17 and 18 and Comparative Example 4, respectively.
  • melt-blown nonwoven fabric Regarding the melt-blown nonwoven fabric, the basis weight, thickness, average fiber diameter of the fibers, coefficient of variation of the fiber diameter of the fibers, and weight average molecular weight (Mw) of the resin composition were measured. Each measured value is shown in Table 3 below. Note that the average value of the fiber diameter of the fibers and the coefficient of variation of the fiber diameter of the fibers were determined using a tabletop scanning electron microscope JCM-6000 manufactured by JEOL. Moreover, the weight average molecular weight (Mw) of the resin composition was measured in the same manner as the weight average molecular weight (Mw) of the raw material composition.
  • the maximum load in the CD direction and MD direction, the tensile elongation at the maximum load point, and the tensile elongation at break were measured for the meltblown nonwoven fabric.
  • the maximum load in the CD direction and MD direction, the tensile elongation at the maximum load point, and the tensile elongation at the break point are determined according to JIS B7721:2018 "Tensile testing machine/compression testing machine - Calibration method and verification method of force measurement system" It was measured using a constant-speed extension type tensile tester based on .
  • a universal testing machine (RTG-1210 manufactured by A&D Co., Ltd.) or the like was used.
  • a test piece (width: 8 mm, length: 40 mm) was cut out from a meltblown nonwoven fabric.
  • the test piece was attached to a tensile testing machine with an initial load at a grip interval of 20 mm. In other words, the gripping interval when the initial load was applied to the test piece was 20 mm.
  • the test piece was pulled by hand to an extent that no sagging occurred.
  • a load was applied at a tensile speed of 20 mm/min until the test piece broke, and the maximum loads in the CD direction and MD direction were measured.
  • Maximum load point tensile elongation (%) [(grip interval at maximum load - grip interval when initial load is applied to the test piece) / grip interval when initial load is applied to the test piece] x 100 (%)
  • Tensile elongation at break (%) [(grabbing interval at break - gripping interval when the initial load is applied to the test piece) / gripping interval when the initial load is applied to the test piece] x 100 (%)
  • the measured values are shown in Table 3 below.
  • Virus droplet collection efficiency (Virus droplet collection efficiency, microparticle collection efficiency, and pollen collection efficiency in melt-blown nonwoven fabric)
  • Virus droplet collection efficiency (VFE), fine particle collection efficiency (PFE), and pollen collection efficiency were measured for the melt-blown nonwoven fabric.
  • Virus droplet collection efficiency (VFE), fine particle collection efficiency (PFE), and pollen collection efficiency are measured according to JIS T9001:2021 "Performance requirements and test methods for medical masks and general masks" did. Note that the virus droplet collection efficiency means the collection efficiency of viruses attached to particles. The measured values are shown in Table 3 below.
  • Pressure loss due to melt-blown nonwoven fabric The pressure drop due to the melt-blown nonwoven fabric was measured. Pressure loss was measured according to JIS T9001:2021 "Performance requirements and test methods for medical masks and general masks". The measured values are shown in Table 3 below.
  • a first test piece having the shape shown in FIG. 4 was obtained by cutting the meltblown nonwoven fabric. Next, the first test piece was folded in half and the overlapping parts were welded together to obtain a second test piece having the shape shown in FIG. In addition, a mask body was prepared that included a pair of ear hooks and a holding section that could hold a mask filter. Then, a mask was produced by placing the second test piece, which was a mask filter, into the holding part of the mask main body. Next, a professional engineer wore the mask for 3 hours and evaluated it according to the following criteria. The results are shown in Table 4 below.
  • ⁇ Tear resistance> 3 No cracks occurred in the second test piece, and no tears occurred in the welded portion of the second test piece.
  • 2 A crack of less than 1 cm occurred in the second test piece, or a tear of less than 1 cm occurred in the welded part of the second test piece (no crack of 1 cm or more occurred in the second test piece, In addition, no tear of 1 cm or more occurred in the welded part of the second test piece.)
  • 1 A crack of 1 cm or more occurred in the second test piece, or a tear of 1 cm or more occurred in the welded part of the second test piece.
  • ⁇ Low fluff> 3 Visually, no fuzz was observed on the second test piece. 2: Small fuzz was generated on the second test piece, but adhesion of the fuzz to the mask body was not visually confirmed. 1: Large fuzz was generated on the second test piece, and adhesion of the fuzz to the mask body was visually confirmed.
  • VFE virus droplet collection efficiency
  • PFE fine particle collection efficiency
  • pollen collection efficiency were high.
  • VFE virus droplet collection efficiency
  • PFE fine particle collection efficiency
  • meltblown nonwoven fabric that is hard to tear and has high particle collection efficiency can be provided.
  • Example 3 in Examples 1, 2, 5 to 15, 17, and 18 in which the average fiber diameter of the fibers is 5.0 ⁇ m or less, the average fiber diameter of the fibers is 6.1 ⁇ m. Compared to certain Example 20, the virus droplet collection efficiency (VFE) and the fine particle collection efficiency (PFE) were much higher. Note that in Examples 1, 2, 5 to 15, 17, and 18, pollen collection efficiency was not measured. Furthermore, as shown in Table 3, in Examples 3 and 4 where the average value of the fiber diameter in the fibers is 5.0 ⁇ m or less, compared to Example 20 where the average value of the fiber diameter in the fibers is 6.1 ⁇ m, Virus droplet collection efficiency (VFE) was even higher.
  • VFE virus droplet collection efficiency
  • Example 3 the fine particle collection efficiency (PFE) and the pollen collection efficiency were not measured. Furthermore, as shown in Table 3, Examples 16 and 19 in which the average fiber diameter of the fibers is 5.0 ⁇ m or less are different from Example 20 in which the average fiber diameter of the fibers is 6.1 ⁇ m. Although the collection efficiency was similar, the virus droplet collection efficiency (VFE) and the fine particle collection efficiency (PFE) were higher than those of Example 20. Therefore, it can be seen that by setting the average value of the fiber diameter of the fibers of the melt-blown non-woven fabric to 5.0 ⁇ m or less, it is possible to provide a melt-blown non-woven fabric with even higher particle collection efficiency.
  • VFE virus droplet collection efficiency
  • PFE fine particle collection efficiency
  • Example 3 in Examples 1, 2, 6 to 15, 17, and 18 in which the average fiber diameter of the fibers is 3.0 ⁇ m or less, the average fiber diameter of the fibers is 3.3 ⁇ m or less. Compared to Example 19, the virus droplet collection efficiency (VFE) and the fine particle collection efficiency (PFE) were much higher. Note that in Examples 1, 2, 6 to 15, 17, and 18, pollen collection efficiency was not measured. Furthermore, as shown in Table 3, in Examples 3 and 4 where the average value of the fiber diameter in the fibers is 3.0 ⁇ m or less, compared to Example 19 where the average value of the fiber diameter in the fibers is 3.3 ⁇ m, Virus droplet collection efficiency (VFE) was even higher.
  • VFE virus droplet collection efficiency
  • Example 5 in which the average fiber diameter of the fibers is 3.0 ⁇ m or less is different from Example 19 in which the average fiber diameter of the fibers is 3.3 ⁇ m. Although the efficiency (PFE) was similar, the virus droplet collection efficiency (VFE) was higher than that of Example 19. Note that in Example 5, pollen collection efficiency was not measured.
  • Example 16 where the average value of the fiber diameter in the fibers is 3.0 ⁇ m or less
  • Example 19 where the average value of the fiber diameter in the fibers is 3.3 ⁇ m and the collection of microparticles.
  • VFE virus droplet collection efficiency
  • melt blown nonwoven fabric has a tensile elongation at break in the MD direction of 120% or more
  • melt blown nonwoven fabric has a tensile elongation at break in the CD direction of 120% or more.
  • meltblown nonwoven fabrics were less likely to tear than Examples 17 and 18, in which the tensile elongation at break in the MD direction of the meltblown nonwoven fabrics was 115% or less.
  • melt blown nonwoven fabric has a tensile elongation at break in the MD direction of 120% or more and a tensile elongation at break in the CD direction of the melt blown nonwoven fabric of 120% or more, the melt blown nonwoven fabric becomes even more difficult to tear. I understand that.
  • Example 1 in which a second melt-blown non-woven fabric was obtained by heating the first melt-blown non-woven fabric, which was the non-woven fabric of Example 17, the melt-blown non-woven fabric was less likely to tear than in Example 17. Ta. Furthermore, as shown in Table 4, in Example 4, in which a second meltblown nonwoven fabric was obtained by heating the first meltblown nonwoven fabric, which was the nonwoven fabric of Example 18, the meltblown nonwoven fabric was less likely to tear than in Example 18. Ta. Therefore, it can be seen that by heating the melt-blown non-woven fabric, the melt-blown non-woven fabric becomes even more difficult to tear.
  • Example 1 in which the second melt-blown non-woven fabric was obtained by heating the first melt-blown non-woven fabric, which is the non-woven fabric of Example 17, compared to Example 17, the MD direction of the melt-blown non-woven fabric was The tensile elongation at break of the melt-blown nonwoven fabric and the tensile elongation at break in the CD direction of the melt-blown nonwoven fabric were high. Furthermore, as shown in Table 3, in Example 4, in which a second melt-blown non-woven fabric was obtained by heating the first melt-blown non-woven fabric, which was the non-woven fabric of Example 18, the MD direction of the melt-blown non-woven fabric was higher than in Example 18.
  • the tensile elongation at break of the melt-blown nonwoven fabric and the tensile elongation at break in the CD direction of the melt-blown nonwoven fabric were high. Therefore, it can be seen that heating the meltblown nonwoven fabric increases the tensile elongation at break in the MD direction of the meltblown nonwoven fabric and the tensile elongation at break in the CD direction of the meltblown nonwoven fabric.
  • Example 1 in which the second melt-blown nonwoven fabric was obtained by heating the first melt-blown nonwoven fabric, which is the nonwoven fabric of Example 17, the breaking point in the CD direction was higher than in Example 17. The tensile elongation and the tensile elongation at break in the MD direction were high. Furthermore, as shown in Table 3, in Example 4, in which a second melt-blown nonwoven fabric was obtained by heating the first melt-blown nonwoven fabric, which was the nonwoven fabric of Example 18, the breaking point in the CD direction was higher than in Example 18. The tensile elongation and the tensile elongation at break in the MD direction were high.
  • the tensile elongation at break in the CD direction of the melt blown nonwoven fabric and the tensile elongation at break in the MD direction of the melt blown nonwoven fabric can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Pulmonology (AREA)
  • Nonwoven Fabrics (AREA)
  • Filtering Materials (AREA)
PCT/JP2023/024192 2022-06-30 2023-06-29 メルトブローン不織布、積層体、マスク用フィルター、及び、マスク Ceased WO2024005146A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202380037962.1A CN119137322A (zh) 2022-06-30 2023-06-29 熔喷无纺布、层叠体、口罩用过滤器及口罩
EP23831585.7A EP4549643A4 (en) 2022-06-30 2023-06-29 Melt-blown nonwoven fabric, laminate, filter for mask, and mask
US18/871,887 US20250327225A1 (en) 2022-06-30 2023-06-29 Melt-blown nonwoven fabric, layered body, filter for face mask, and face mask
JP2024530967A JPWO2024005146A1 (https=) 2022-06-30 2023-06-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022106106 2022-06-30
JP2022-106106 2022-06-30

Publications (1)

Publication Number Publication Date
WO2024005146A1 true WO2024005146A1 (ja) 2024-01-04

Family

ID=89382436

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/024192 Ceased WO2024005146A1 (ja) 2022-06-30 2023-06-29 メルトブローン不織布、積層体、マスク用フィルター、及び、マスク

Country Status (5)

Country Link
US (1) US20250327225A1 (https=)
EP (1) EP4549643A4 (https=)
JP (1) JPWO2024005146A1 (https=)
CN (1) CN119137322A (https=)
WO (1) WO2024005146A1 (https=)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025187479A1 (ja) * 2024-03-06 2025-09-12 株式会社カネカ 不織布、積層体、エアフィルター、マスク用フィルター、及び、マスク
WO2026034251A1 (ja) * 2024-08-05 2026-02-12 株式会社カネカ 不織布、それを含む積層シート、及びそれらを含む食品用製品
WO2026034254A1 (ja) * 2024-08-05 2026-02-12 株式会社カネカ 不織布、それを含む積層シート、それらを含む食品用製品、及びその製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004532360A (ja) * 2001-03-27 2004-10-21 ザ プロクター アンド ギャンブル カンパニー ポリヒドロキシアルカノエートコポリマー／ポリ乳酸ポリマー又はコポリマーブレンドを含む繊維
JP2016513153A (ja) * 2013-02-18 2016-05-12 ユー．エス．パシフィック ノンウーブンス インダストリー リミテッドＵ．Ｓ．Ｐａｃｉｆｉｃ Ｎｏｎｗｏｖｅｎｓ Ｉｎｄｕｓｔｒｙ Ｌｉｍｉｔｅｄ 生分解性薄膜及び積層材料
WO2017122679A1 (ja) * 2016-01-12 2017-07-20 国立大学法人東京工業大学 生分解性脂肪族ポリエステル系繊維および製造方法
WO2019142845A1 (ja) 2018-01-17 2019-07-25 株式会社カネカ 高組成比率の３ｈｈモノマー単位を含む共重合ｐｈａを生産する形質転換微生物およびそれによるｐｈａの製造方法
WO2021206155A1 (ja) 2020-04-10 2021-10-14 株式会社カネカ 共重合ポリヒドロキシアルカン酸混合物の製造方法、及び形質転換微生物
WO2022097528A1 (ja) * 2020-11-05 2022-05-12 株式会社カネカ 生分解性繊維の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004532360A (ja) * 2001-03-27 2004-10-21 ザ プロクター アンド ギャンブル カンパニー ポリヒドロキシアルカノエートコポリマー／ポリ乳酸ポリマー又はコポリマーブレンドを含む繊維
JP2016513153A (ja) * 2013-02-18 2016-05-12 ユー．エス．パシフィック ノンウーブンス インダストリー リミテッドＵ．Ｓ．Ｐａｃｉｆｉｃ Ｎｏｎｗｏｖｅｎｓ Ｉｎｄｕｓｔｒｙ Ｌｉｍｉｔｅｄ 生分解性薄膜及び積層材料
WO2017122679A1 (ja) * 2016-01-12 2017-07-20 国立大学法人東京工業大学 生分解性脂肪族ポリエステル系繊維および製造方法
WO2019142845A1 (ja) 2018-01-17 2019-07-25 株式会社カネカ 高組成比率の３ｈｈモノマー単位を含む共重合ｐｈａを生産する形質転換微生物およびそれによるｐｈａの製造方法
WO2021206155A1 (ja) 2020-04-10 2021-10-14 株式会社カネカ 共重合ポリヒドロキシアルカン酸混合物の製造方法、及び形質転換微生物
WO2022097528A1 (ja) * 2020-11-05 2022-05-12 株式会社カネカ 生分解性繊維の製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025187479A1 (ja) * 2024-03-06 2025-09-12 株式会社カネカ 不織布、積層体、エアフィルター、マスク用フィルター、及び、マスク
WO2026034251A1 (ja) * 2024-08-05 2026-02-12 株式会社カネカ 不織布、それを含む積層シート、及びそれらを含む食品用製品
WO2026034254A1 (ja) * 2024-08-05 2026-02-12 株式会社カネカ 不織布、それを含む積層シート、それらを含む食品用製品、及びその製造方法

Also Published As

Publication number Publication date
US20250327225A1 (en) 2025-10-23
EP4549643A1 (en) 2025-05-07
CN119137322A (zh) 2024-12-13
JPWO2024005146A1 (https=) 2024-01-04
EP4549643A4 (en) 2026-05-06

Similar Documents

Publication Publication Date Title
WO2024005146A1 (ja) メルトブローン不織布、積層体、マスク用フィルター、及び、マスク
TWI772777B (zh) 具有奈米纖維層的非織造多層結構
JP6901594B2 (ja) ポリアミドナノファイバー不織布
US20180044828A1 (en) Laminated nonwoven fabric
KR20170117525A (ko) 단층 또는 복층 폴리에스테르 장섬유 부직포 및 그것을 이용한 식품용 필터
EP4596773A1 (en) Method for producing non-woven fabric and melt-blown non-woven fabric, hot-melted body and method for producing same, coffee filter, and coffee capsule
JP7299316B2 (ja) メルトブロー不織布、フィルター、及びメルトブロー不織布の製造方法
EP4446488A1 (en) Melt-blown nonwoven fabric and method for manufacturing same
JP3816828B2 (ja) 高温熱成型可能な立体成型用不織布とそれを用いた吸音材
JP2021527173A (ja) 調節可能なナノファイバー不織布製品
CN117098881A (zh) 复丝及其制造方法、以及短纤维及其制造方法
US20250027237A1 (en) Melt-blown nonwoven fabric, method of producing the same, layered body, filter for face mask, and face mask
KR102548677B1 (ko) 다공성 폴리에스테르 물질
TW202240038A (zh) 可生物降解的多組分聚合物纖維
JP5610831B2 (ja) 湿式短繊維不織布用ショートカット複合繊維
WO2024005145A1 (ja) 不織布、及び、その製造方法
WO2025204710A1 (ja) 繊維及びその製造方法、並びに、繊維構造体及びその製造方法
JP2025153874A (ja) 繊維及びその製造方法、並びに、繊維構造体及びその製造方法
JP7259360B2 (ja) 液晶ポリエステル繊維からなる不織布
JP2025153875A (ja) 繊維、及び、繊維構造体
WO2025187479A1 (ja) 不織布、積層体、エアフィルター、マスク用フィルター、及び、マスク
JP2024175267A (ja) スパンボンド不織布の製造方法、スパンボンド不織布、及び、その利用
US20250223727A1 (en) Multifilament and method for producing the same
WO2026034254A1 (ja) 不織布、それを含む積層シート、それらを含む食品用製品、及びその製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23831585

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2024530967

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 202380037962.1

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 18871887

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 2023831585

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2023831585

Country of ref document: EP

Effective date: 20250130

WWP Wipo information: published in national office

Ref document number: 2023831585

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 18871887

Country of ref document: US