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
  • D04H13/00—Other non-woven fabrics
• • 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
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
• • 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
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/007—Addition polymers
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
  • D04H3/147—Composite yarns or filaments
• • 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
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
• • 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
  • D10B2401/00—Physical properties
  • D10B2401/06—Load-responsive characteristics
  • D10B2401/061—Load-responsive characteristics elastic
• • 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
  • D10B2509/00—Medical; Hygiene
  • D10B2509/02—Bandages, dressings or absorbent pads
  • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

• This disclosure relates to nonwoven fabric laminates, stretchable nonwoven fabric laminates, textile products, absorbent articles, masks, and poultices.
• nonwoven fabrics have been widely used for various purposes due to their excellent breathability and flexibility. Therefore, nonwoven fabrics are required to have various properties according to the purpose, and there is a demand for improving these properties.
• nonwoven fabrics used in sanitary materials such as disposable diapers and sanitary napkins, and as base fabrics for wet compresses, are required to have water resistance and excellent moisture permeability. Depending on the location of use, they are also required to have stretchability and bulkiness.
• Patent Document 1 discloses a nonwoven fabric laminate with excellent elasticity and other properties.
• the nonwoven fabric laminate disclosed in Patent Document 1 is formed by laminating mixed fiber spunbonded nonwoven fabric layers on both sides of one or more meltblown nonwoven fabric layers.
• the mixed fiber spunbonded nonwoven fabric layer contains long fibers of a thermoplastic elastomer (A) and long fibers of a thermoplastic resin (B) other than the thermoplastic elastomer (A).
• Patent document 1 International Publication No. 2007/138733
• one embodiment of the present disclosure aims to provide a nonwoven fabric laminate that can suppress the occurrence of blocking even when unwound from a nonwoven fabric roll at high speed, as well as a stretchable nonwoven fabric laminate, a textile product, an absorbent article, a mask, and a poultice.
• a ratio of the ⁇ -olefin copolymer to the total amount of the elastic nonwoven fabric is 90% by mass to 100% by mass
• the fibers contained in the extensible spunbonded nonwoven fabric are made of a resin composition for extensible spunbonded nonwoven fabrics,
• the resin composition for extensible spunbonded nonwoven fabrics is A propylene-based polymer (A),
• the propylene polymer (A) contains a propylene homopolymer
• the fibers contained in the extensible spunbonded nonwoven fabric are islands-in-the-sea fibers,
• the islands-in-the-sea fibers are made of a resin composition for extensible spunbonded nonwoven fabrics,
• the resin composition for extensible spunbonded nonwoven fabrics is A propylene-based polymer (A) containing a propylene homopolymer;
• a polymer (B) which is at least one selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters;
• ⁇ 8> The nonwoven fabric laminate according to ⁇ 7>, wherein a ratio (b/a) of the average fiber diameter b to the average fiber diameter a is 1.0 or greater and 1.35 or less.
• ⁇ 9> The nonwoven fabric laminate according to any one of ⁇ 1> to ⁇ 8>, further comprising a film layer.
• a stretchable nonwoven fabric laminate which is a stretch-processed product of the nonwoven fabric laminate according to any one of ⁇ 1> to ⁇ 9>.
• ⁇ 11> A textile product comprising the nonwoven fabric laminate according to any one of ⁇ 1> to ⁇ 9>.
• ⁇ 12> The textile product according to ⁇ 11>, further comprising an engaging means.
• a nonwoven fabric laminate that can suppress the occurrence of blocking even when unwound from a nonwoven fabric roll at high speed, as well as a stretchable nonwoven fabric laminate, a textile product, an absorbent article, a mask, and a plaster.
• FIG. 1 is a schematic diagram of a gear stretching device.
• 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.
• the nonwoven fabric laminate of the first embodiment of the present disclosure includes an elastic nonwoven fabric and an extensible spunbonded nonwoven fabric disposed on both sides of the elastic nonwoven fabric.
• Elastic nonwoven fabric refers to a nonwoven fabric having elasticity.
• Elastic nonwoven fabric refers to a nonwoven fabric having a property that when the stress is released after the nonwoven fabric is stretched, the nonwoven fabric recovers to the shape before the nonwoven fabric is stretched due to elasticity.
• the fibers contained in the elastic nonwoven fabric according to the present disclosure are made of a resin composition for elastic nonwoven fabric, and the storage modulus E23 of the resin composition for elastic nonwoven fabric is 25.0 MPa or less. If the storage modulus E23 of the resin composition for elastic nonwoven fabric exceeds 25.0 MPa, the stretch properties of the nonwoven fabric laminate tend to be easily reduced.
• the storage modulus E23 of the resin composition for elastic nonwoven fabric is preferably 22.0 MPa or less, and more preferably 18.0 MPa or less.
• the method for measuring the storage modulus E23 is the same as that described in the examples.
• a resin composition for elastic nonwoven fabrics having a storage modulus E23 of 25.0 MPa or less can affect the stretch properties of the nonwoven fabric laminate whether it is contained in the front layer, back layer, or intermediate layer.
• “Nonwoven fabric” refers to a flat fiber assembly that has a predetermined level of structural strength obtained by physical and/or chemical methods, excluding weaving, knitting, and papermaking.
• Extensible spunbond nonwoven fabric refers to a spunbond nonwoven fabric having extensibility.
• Having extensibility refers to the spunbond nonwoven fabric having a first property and a second property.
• First property refers to the property that the outer shape of the spunbond nonwoven fabric stretches in one direction when an external force is applied to the spunbond nonwoven fabric.
• Second property refers to the property that the outer shape of the spunbond nonwoven fabric does not easily return to its original shape even when the external force applied to the spunbond nonwoven fabric is released.
• a nonwoven fabric having extensibility refers to a fabric having a maximum elongation of 50% or more, preferably 70% or more, more preferably 100% or more, and exhibiting almost no elastic recovery.
• spunbond nonwoven refers to a nonwoven fabric made by one or more bonding methods to a spunlaid web.
• spunlaid web refers to a web laminated by spinlaid lamination.
• spinlaid lamination refers to a method of making a web by extruding molten or dissolved polymer through a nozzle and laying the filaments onto a moving screen.
• Formation coefficient refers to the uniformity of the nonwoven fabric. The method for quantifying the formation coefficient is the same as the measurement method described in the Examples. A lower formation coefficient indicates a more uniform nonwoven fabric.
• the nonwoven fabric laminate of the first embodiment Since the nonwoven fabric laminate of the first embodiment has the above-mentioned configuration, the occurrence of blocking can be suppressed even when the nonwoven fabric laminate is unwound from the nonwoven fabric roll at high speed (e.g., 200 m/min). This effect is believed to be due to, but not limited to, the following reasons.
• Elastic nonwoven fabrics generally have adhesive properties. A surface coefficient of 38 or more indicates that in a nonwoven fabric roll around which a nonwoven fabric laminate is wound, even if pressure is applied to the nonwoven fabric laminate due to tightening, the elastic nonwoven fabric contained in the nonwoven fabric laminate is unlikely to be exposed on the surface of the nonwoven fabric laminate. Therefore, in the nonwoven fabric roll, the nonwoven fabric laminates are unlikely to adhere to each other. As a result, it is presumed that the nonwoven fabric laminate of the first embodiment can suppress the occurrence of blocking even when unwound from the nonwoven fabric roll at high speed.
• the surface coefficient is 38 or more, and from the viewpoint of further suppressing the occurrence of blocking even when the nonwoven fabric is unwound from a roll at high speed (e.g., 200 m/min), it is preferably 38 to 60, more preferably 38 to 50.
• the method for calculating the surface coefficient is the same as that described in the examples.
• the method of increasing the surface coefficient to 38 or more is preferably to design the fibers contained in the elastic nonwoven fabric to have a thicker average fiber diameter and the fibers contained in the stretchable nonwoven fabric laminate to have a thinner average fiber diameter, resulting in a lower formation coefficient. Specifically, this can be achieved by adjusting the single-hole output (g/hole), the stretching air speed (m/min), and the melt flow rate (MFR: Melt Flow Rate) of the resin composition.
• Methods for designing the formation coefficient include adjusting the single-hole output (g/hole) and the suction blower air volume.
• the ratio of the basis weight of the elastic nonwoven fabric to the basis weight of the nonwoven fabric laminate (hereinafter also referred to as "total basis weight") is not particularly limited, but is preferably 15% to 48%. This allows the elasticity of the nonwoven fabric laminate and blocking resistance during roll production to be compatible.
• the basis weight ratio (NW/total) is more preferably 20% to 48% from the viewpoint of improving yarn breakage, and from the viewpoint of a softer nonwoven fabric, it is further preferably 20% to 43%, and particularly preferably 25% to 43%.
• the total basis weight is not particularly limited, but is preferably 360 g/ m2 or less, more preferably 240 g/ m2 or less, even more preferably 150 g/ m2 or less, particularly preferably 15 g/ m2 to 120 g/ m2 , even more preferably 20 g/ m2 to 80 g/ m2 , and even more preferably 25 g/ m2 to 70 g/ m2 .
• the method for measuring the total basis weight of the nonwoven fabric laminate was the same as in the examples.
• the nonwoven fabric laminate of the first embodiment includes an extensible spunbond nonwoven fabric.
• the basis weight of the extensible spunbonded nonwoven fabric is preferably 5 g/m 2 to 120 g/m 2 , more preferably 8 g/m 2 to 50 g/m 2.
• the preferred range varies depending on the application, and in applications requiring a softer nonwoven fabric, the basis weight of the extensible spunbonded nonwoven fabric is more preferably 13 g/m 2 to 35 g/m 2 , particularly preferably 13 g/m 2 to 24.9 g/m 2 , and even more preferably 16 g/m 2 to 21 g/m 2.
• the basis weight of the extensible spunbonded nonwoven fabric is more preferably more than 35 g/m 2 and not more than 50 g/m 2 .
• the method for measuring the basis weight of the extensible spunbonded nonwoven fabric is the same as that described in the Examples.
• the average fiber diameter (hereinafter also referred to as "average fiber diameter a") of the fibers (hereinafter also referred to as “extensible fibers”) constituting the extensible spunbonded nonwoven fabric is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less, even more preferably 30 ⁇ m or less, and particularly preferably 25 ⁇ m or less.
• the average fiber diameter a of the extensible fibers is preferably 1 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 20 ⁇ m or more.
• the average fiber diameter a of the extensible fibers is equal to or smaller than the average fiber diameter (hereinafter also referred to as "average fiber diameter b") of the fibers (hereinafter also referred to as “elastic fibers”) constituting the elastic nonwoven fabric, and it is more preferable that the average fiber diameter b is smaller than the average fiber diameter a.
• the ratio (b/a) of the average fiber diameter b of the elastic fibers to the average fiber diameter a of the extendible fibers is more preferably 1.0 or more and 1.35 or less, and more preferably more than 1.0 and 1.35 or less.
• the method for measuring the average fiber diameter a of the extendable fiber is the same as that described in the Examples.
• the extensible fibers may be long or short fibers.
• the extensible fibers may be, for example, sheath-core, side-by-side, islands-in-the-sea, or side-by-side.
• the sheath-core fibers have only to have a core and a sheath, and may be either a concentric sheath-core type or an eccentric sheath-core type.
• the eccentric sheath-core fibers may have the core exposed on the surface, or may not have the core exposed on the surface.
• the islands-in-the-sea fibers have a sea phase and a plurality of island phases.
• the extensible fibers are preferably islands-in-sea type or concentric core-sheath type, and more preferably islands-in-sea type.
• the number of thread breaks that occur during spinning of the resin composition that is the raw material of the extensible spunbonded nonwoven fabric is reduced.
• the productivity of the nonwoven fabric laminate is improved.
• the number of thread breaks is reduced, the number of fibers whose fiber ends are exposed on the nonwoven fabric surface can be reduced, and the feel of the skin, such as a prickly feeling, can also be improved.
• Resin composition for extensible spunbond nonwoven fabric The extensible fiber is made of a resin composition for extensible spunbond nonwoven fabric (hereinafter also referred to as "resin composition (SB)").
• the resin composition (SB) preferably contains an olefin-based polymer, and may contain only an olefin-based polymer.
• the olefin-based polymer may be a polyolefin-based elastomer.
• the olefin polymer may be used alone or in combination of two or more kinds.
• Olefin-based polymer is preferably a polymer having crystallinity.
• crystalline components in the polymerization having crystallinity include polypropylene, poly-1-butene, poly-4-methyl-1-pentene, etc.
• the olefin-based polymer may be one type alone or two or more types in combination.
• olefin polymer examples include propylene polymer (A) and polyolefin (excluding propylene polymer (A)).
• propylene polymer (A) and polyolefin (excluding propylene polymer (A)) may be of only one type, or may be of two or more types having different melting points, molecular weights, crystal structures, etc.
• Propylene-based polymer (A) contains structural units derived from propylene.
• the propylene polymer (A) is a propylene homopolymer or a propylene copolymer.
• the propylene copolymer is preferably a copolymer of propylene and at least one of ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, etc.
• the propylene polymer (A) preferably contains a propylene homopolymer, and more preferably is a propylene homopolymer.
• the melting point of the propylene polymer (A) is preferably 140°C or higher, more preferably 150°C or higher, further preferably 155°C or higher, particularly preferably 157°C to 165°C.
• the method for measuring the melting point of the propylene polymer (A) is the same as that described in the Examples.
• the melting point of the propylene polymer (A) refers to the higher of the two (hereinafter the same applies to two or more components).
• the MFR of the propylene polymer (A) is not particularly limited as long as the resin composition (SB) can be melt-spun, and is preferably 1 g/10 min to 1,000 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 propylene polymer (A) is measured in accordance with ASTM D-1238 under the conditions of 230° C. and a load of 2.16 kg.
• the MFR of the propylene polymer (A) refers to the MFR of a resin composition containing two or more types of propylene polymers (A) (hereinafter the same applies to two or more components).
• the content of the propylene polymer (A) 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 resin composition (SB).
• the propylene polymer (A) may be a commercially available product.
• the propylene polymer (A) may be a biomass-derived propylene polymer.
• Biomass-derived propylene-based polymer refers to a propylene-based polymer (A) produced from a raw material monomer 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 include, in addition to bio-derived propylene, propylene derived from fossil fuels such as petroleum, and/or 1-butene, 1-hexene, and the like other than ethylene and propylene.
• Biomass-derived propylene polymers can also be obtained by polymerizing propylene obtained by synthesis of methanol-to-olefins (MTO) or methanol-to-propylene (MTP) using gas generated by pyrolysis of empty fruit bunches (EFB) such as coconut shells. Furthermore, 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 such as sorgo.
• MTO methanol-to-olefins
• EFB empty fruit bunches
• 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 percentage 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 percentage 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 nonwoven fabric laminate of the first embodiment is preferably 5% or more.
• the content of the biomass-derived propylene-based polymer used in the nonwoven fabric laminate of the first embodiment 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 total of the fossil fuel-derived polypropylene resin and the biomass-derived polypropylene resin.
• the propylene-based polymer (A) used as a raw material for the nonwoven fabric laminate of the first embodiment 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, and can be produced, for example, by the method described in DE 10 2019 127 827 (A1).
• the recycled polymer may contain a marker that identifies it as having been obtained by recycling.
• the polyolefin (excluding the propylene polymer (A)) is a homopolymer or copolymer of an ⁇ -olefin.
• the ⁇ -olefin is an ⁇ -olefin having 2 or more carbon atoms (excluding 3 carbon atoms), and preferably includes a homopolymer of an ⁇ -olefin having 2 to 8 carbon atoms (excluding 3 carbon atoms), and more preferably is a homopolymer of an ⁇ -olefin having 2 to 8 carbon atoms (excluding 3 carbon atoms).
• the ⁇ -olefin examples include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene. Of these, the ⁇ -olefin is preferably ethylene.
• examples of polyolefins include polyethylene (ethylene homopolymer), 1-butene polymer, poly-4-methyl-1-pentene, and the like.
• examples of polyethylene include high-pressure low-density polyethylene, linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE).
• Examples of the 1-butene polymer examples include 1-butene homopolymer, 1-butene-ethylene copolymer, and 1-butene-propylene copolymer.
• the density of the polyethylene is preferably 0.94 g/cm 3 to 0.98 g/cm 3 , and more preferably 0.94 g/cm 3 to 0.97 g/cm 3 .
• the melting point of the polyolefin (excluding the propylene polymer (A)) is preferably 150°C or higher, more preferably 155°C or higher, and even more preferably 155°C to 165°C.
• the MFR of the polyolefin is not particularly limited as long as the melt of the resin composition (SB) can be spun, and is preferably 1 g/10 min to 1000 g/10 min, more preferably 2 g/10 min to 500 g/10 min, and even more preferably 3 g/10 min to 100 g/10 min.
• the polyolefin (excluding the propylene-based polymer (A)) is polyethylene
• the MFR is measured in accordance with ASTM D-1238 under the measurement conditions of 190° C. and a load of 2.16 kg.
• the content of polyolefin is preferably 1.0 mass% to 10.0 mass%, more preferably 3.0 mass% to 8.0 mass%, and even more preferably 5.0 mass% to 7.0 mass%, based on the total amount of resin composition (SB). If the content of polyolefin (excluding propylene-based polymer (A)) is within the above range, the extensibility of the extensible spunbond nonwoven fabric is improved.
• the resin composition (SB) may contain a polymer other than the olefin-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 the olefin-based polymers.
• thermoplastic elastomers 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 olefin polymers include polyester, polyamide (nylon-6, nylon-66, polymetaxylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl alcohol copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-acrylic acid ester-carbon monoxide copolymer, 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 at least one diol.
• the content of polyolefin (excluding propylene-based polymer (A)) in the extensible spunbond nonwoven fabric 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 (excluding propylene-based polymer (A)) and other polymers (thermoplastic resins other than thermoplastic elastomers and olefin-based polymers).
• the content of the propylene-based polymer (A) is preferably 80% by mass to 99% by mass, more preferably 84% by mass to 96% by mass, based on the total amount of the resin composition (SB).
• the resin composition (SB) may contain, as optional components, various known additives such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the object of the present disclosure.
• various known additives such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the object of the present disclosure.
• the fibers contained in the extensible spunbonded nonwoven fabric are made of a resin composition for extensible spunbonded nonwoven fabrics,
• the resin composition for extensible spunbonded nonwoven fabrics is A propylene-based polymer (A),
• the polymer (B) is at least one selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters. This reduces the number of yarn breaks that occur during spinning of the resin composition that is the raw material of the extensible spunbonded nonwoven fabric, thereby improving the productivity of the nonwoven fabric laminate.
• the propylene polymer (A) contains a propylene homopolymer, From the viewpoints of improving the tensile strength of the spunbonded nonwoven fabric and of the extensibility and flexibility of the spunbonded nonwoven fabric, the polymer (B) preferably contains polyethylene having a density of 0.94 g/cm 3 to 0.97 g/cm 3 .
• the content of polymer (B) is preferably 1.0% by mass to 10.0% by mass, more preferably 3.0% by mass to 8.0% by mass, and even more preferably 5.0% by mass to 7.0% by mass, based on the total amount of resin composition (SB). If the content of polymer (B) is within the above range, the extensibility of the spunbond nonwoven fabric is improved.
• the islands-in-sea type fiber preferably has an islands-in-sea structure in which the sea phase is a propylene-based polymer (A) (preferably a homopolymer of propylene) and the island phase is a polymer (B) (preferably a high-density polyethylene). This inhibits the orientation and crystallization of the main component of the sea phase, improving the extensibility of the extensible spunbonded nonwoven fabric.
• A propylene-based polymer
• B preferably a high-density polyethylene
• the concentric sheath-core fiber preferably has a core made of a low MFR olefin polymer and a sheath made of a high MFR olefin polymer, and the difference in MFR between the low MFR olefin polymer and the high MFR olefin polymer is 1 g/10 min or more.
• the MFR of the low MFR olefin polymer may be 1 g/10 min to 1000 g/10 min.
• the MFR of the high MFR olefin polymer may be 1 g/10 min to 1000 g/10 min.
• the difference in MFR is preferably 15 g/10 min or more, more preferably 30 g/10 min or more, and particularly preferably 40 g/10 min or more.
• the difference in MFR is preferably 100 g/10 min or less, more preferably 70 g/10 min or less.
• the extensible spunbond nonwoven fabrics preferably include extensible spunbond nonwoven fabrics that satisfy the following requirements (a1) and (a3).
• Requirement (1.1.3.1) Requirement (a1) (a1) A spunbond nonwoven fabric using core-sheath fibers, side-by-side fibers or crimped fibers made of two or more kinds of olefin polymers having a difference in induction time of crystallization in flow-induced phase separation of 100 seconds or more.
• the two or more olefin-based polymers may be, for example, a propylene-based polymer (A) having a high melting point and a propylene-based polymer (A) having a low melting point.
• the propylene-based polymer (A) may be, for example, a propylene-based polymer copolymerized with a propylene homopolymer and a random copolymer of propylene and an ⁇ -olefin having a low melting point in the range of 130°C to 150°C.
• (1.1.3.3) Requirement (a3) (a3) A spunbonded nonwoven fabric using concentric core-sheath fibers, wherein the core is made of a low MFR propylene-based polymer (A) having an MFR in the range of 1 g/10 min to 200 g/10 min, and the sheath is made of a high MFR propylene-based polymer (A) having an MFR in the range of 16 g/10 min to 215 g/10 min, and the difference between the MFR of the core and the MFR of the sheath is 15 g/10 min or more.
• a low MFR propylene-based polymer A having an MFR in the range of 1 g/10 min to 200 g/10 min
• the sheath is made of a high MFR propylene-based polymer (A) having an MFR in the range of 16 g/10 min to 215 g/10 min
• the difference between the MFR of the core and the MFR of the sheath is 15 g/10 min or more.
• X1 A spunbond nonwoven fabric using core-sheath fibers, parallel fibers, or crimped fibers, in which the core is a propylene-based polymer (A) (preferably a propylene homopolymer) having a low MFR and high melting point with an MFR in the range of 10 g/10 min to 200 g/10 min and a melting point in the range of 157°C to 165°C, and the sheath is a propylene- ⁇ -olefin random copolymer having a high MFR and low melting point with an MFR in the range of 10 g/10 min to 200 g/10 min and a melting point in the range of 130°C to 150°C, and the difference between the MFR of the core and the MFR of the sheath is 1 g/10 min or more.
• A propylene-based polymer
• A preferably a propylene homopolymer
• the sheath is a propylene- ⁇ -olefin random copolymer having
• a spunbond nonwoven fabric comprising concentric core-sheath fibers, the core of which is a low MFR propylene polymer (A) (preferably a propylene homopolymer) having an MFR in the range of 1 g/10 min to 200 g/10 min, the sheath of which is a high MFR propylene polymer (A) (preferably a propylene homopolymer) having an MFR in the range of 31 g/10 min to 230 g/10 min, and the difference between the MFR of the core and the MFR of the sheath being 30 g/10 min or more.
• A low MFR propylene polymer
• A preferably a propylene homopolymer
• A preferably a propylene homopolymer having an MFR in the range of 31 g/10 min to 230 g/10 min
• the difference between the MFR of the core and the MFR of the sheath being 30 g/10 min or more.
• the core may be a propylene polymer (A) having a low MFR in the range of 10 g/10 min to 50 g/10 min
• the sheath may be a propylene polymer (A) having a high MFR in the range of 50 g/10 min to 100 g/10 min.
• the difference between the MFR of the core and the MFR of the sheath may be 30 g/10 min to 100 g/10 min, or 40 g/10 min to 80 g/10 min.
• the nonwoven fabric laminate of the first embodiment includes an elastic nonwoven fabric.
• the type of elastic nonwoven fabric is not particularly limited, and examples include spunbond nonwoven fabric, meltblown nonwoven fabric, flash spun nonwoven fabric, staple fiber, etc.
• the type of elastic nonwoven fabric is preferably spunbond nonwoven fabric, from the viewpoint of using long fibers in the elastic nonwoven fabric.
• the weight per unit area of the elastic nonwoven fabric is preferably 2 g/m 2 to 120 g/m 2 , more preferably 2 g/m 2 to 40 g/m 2 or less, even more preferably 12 g/m 2 to 37 g/m 2 , particularly preferably 12 g/m 2 to 32 g/m 2 , even more preferably 16 g/m 2 to 26 g/m 2 , and even more preferably 16 g/m 2 to 20 g/m 2 .
• the method for measuring the basis weight of the elastic nonwoven fabric is the same as that described in the examples.
• the average fiber diameter b of the elastic fiber is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less, even more preferably 35 ⁇ m or less, and particularly preferably 30 ⁇ m or less.
• the average fiber diameter b of the elastic fiber is preferably 1 ⁇ m or more, more preferably 10 ⁇ m or more, even more preferably 20 ⁇ m or more, and particularly preferably 24 ⁇ m or more.
• the average fiber diameter b of the elastic fiber is more than 20 ⁇ m and 35 ⁇ m or less, and the average fiber diameter a of the extensible fiber is smaller than the average fiber diameter b of the elastic fiber.
• the average fiber diameter b of the elastic fiber is more than 20 ⁇ m and 35 ⁇ m or less, and the fiber-based ratio (b/a) is 1.0 or more and 1.35 or less. It is more preferred that the fiber-based ratio (b/a) is more than 1.0 and 1.35 or less.
• the method for measuring the average fiber diameter b of the elastic fibers is the same as that described in the Examples.
• the cross-sectional shape of the elastic fiber is not particularly limited, and examples include circular, elliptical, irregular shapes, etc.
• the elastic fibers may be, for example, sheath-core, side-by-side, sea-island, or parallel.
• Sheath-core fibers need only have a core and a sheath, and may be either a concentric sheath-core type or an eccentric sheath-core type.
• Eccentric sheath-core fibers may have a core exposed on the surface, or may not have a core exposed on the surface.
• the elastic fiber is made of a resin composition for elastic nonwoven fabrics (hereinafter, also referred to as "resin composition (NW)").
• the resin composition (NW) preferably contains an ⁇ -olefin copolymer, and may contain only an ⁇ -olefin copolymer.
• the propylene-based polymer may be used alone or in combination of two or more kinds in the resin composition (NW).
• the resin composition (NW) preferably contains an ⁇ -olefin copolymer. This makes it possible to obtain a nonwoven fabric laminate having better elastic properties and better stress retention than an elastic nonwoven fabric that does not contain an ⁇ -olefin copolymer (e.g., an elastic nonwoven fabric made of a propylene homopolymer).
• the resin composition (NW) contains an ⁇ -olefin copolymer and does not contain a propylene homopolymer.
• the elastic nonwoven fabric is an elastic nonwoven fabric containing an ⁇ -olefin copolymer (excluding elastic nonwoven fabric containing propylene homopolymer). This makes the nonwoven fabric laminate have better elastic properties and better stress maintenance than when an elastic nonwoven fabric not containing an ⁇ -olefin copolymer (for example, an elastic nonwoven fabric made of propylene homopolymer) is used.
• ⁇ -olefin copolymer refers to a copolymer in which two or more copolymerization components having ⁇ -olefin skeletons are copolymerized.
• the copolymerization component having an ⁇ -olefin skeleton examples include ⁇ -olefins, such as ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene.
• the ⁇ -olefin copolymer preferably contains an ethylene and propylene copolymer having ethylene and propylene as copolymerization components, from the viewpoint of making the nonwoven fabric laminate have lower stress and better elasticity.
• the content of structural units derived from ethylene in the ethylene and propylene copolymer is preferably 1% by mass to 50% by mass, more preferably 5% by mass to 25% by mass, even more preferably 10% by mass to 20% by mass, and particularly preferably 12% by mass to 18% by mass.
• the ⁇ -olefin copolymer may be any of an alternating copolymer, a graft copolymer, a block copolymer, and a random copolymer.
• the density (ASTM D 1505) of the ⁇ -olefin copolymer is preferably 0.850 g/cm 3 to 0.950 g/cm 3 , more preferably 0.855 g/cm 3 to 0.900 g/cm 3 , and even more preferably 0.860 g/cm 3 to 0.895 g/cm 3 .
• the density of the ⁇ -olefin copolymer is a value obtained by measurement according to the density gradient method of JIS K7112 (1999).
• the tensile modulus of the ⁇ -olefin copolymer is preferably 30 MPa or less, more preferably 20 MPa or less, and further preferably 15 MPa or less.
• the tensile modulus of the ⁇ -olefin copolymer is not particularly limited, and may be 5 MPa or more.
• the tensile modulus is a value obtained by measurement according to a method in accordance with JIS K7161 (2011).
• the molecular weight distribution (Mw/Mn) of the ⁇ -olefin copolymer is preferably 1.5 to 5.0. In terms of obtaining fibers having good spinnability and particularly excellent fiber strength, Mw/Mn is preferably 1.5 to 4.5.
• the mass average molecular weight (Mw) and number average molecular weight (Mn) of the ⁇ -olefin copolymer are values determined by gel permeation chromatography (GPC) under the following conditions.
• the mass average molecular weight (Mw) is the mass average molecular weight converted into polystyrene, and the molecular weight distribution (Mw/Mn) is a value calculated from the number average molecular weight (Mn) and mass average molecular weight (Mw) measured in the same manner.
• Mw/Mn molecular weight distribution
• Mw/Mn molecular weight distribution
• the MFR of the ⁇ -olefin copolymer is not particularly limited, and is preferably 1 g/10 min to 100 g/10 min, more preferably 10 g/10 min to 80 g/10 min, further preferably 15 g/10 min to 70 g/10 min, and particularly preferably 15 g/10 min to 50 g/10 min.
• the MFR of the ⁇ -olefin copolymer is measured in accordance with ASTM D-1238 under the conditions of 230° C. and a load of 2.16 kg.
• the ⁇ -olefin copolymer may be a synthetic product or a commercially available product.
• the ⁇ -olefin copolymer can be prepared by polymerizing or copolymerizing a monomer in the presence of a conventionally known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst by a conventionally known polymerization method such as a gas phase method, a bulk method, a slurry method or a solution method.
• a conventionally known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst
• a conventionally known polymerization method such as a gas phase method, a bulk method, a slurry method or a solution method.
• Commercially available ⁇ -olefin copolymers include, for example, Tafmer (manufactured by Mitsui Chemicals, Inc.), Vistamaxx series (manufactured by ExxonMobil Chemical Corporation), and Versify.
• composition of the ⁇ -olefin copolymer can be determined using conventional methods (e.g., IR analysis, NMR analysis, microanalysis, etc.).
• the proportion of the ⁇ -olefin copolymer in the total amount of the elastic nonwoven fabric is preferably 90% by mass to 100% by mass, and more preferably 98% by mass to 100% by mass.
• the ratio of the ethylene and propylene copolymer to the total amount of the elastic nonwoven fabric is preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, from the viewpoint of the stretch properties of the nonwoven fabric laminate.
• the melting point of the ⁇ -olefin is preferably 130° C. or lower, more preferably 115° C. or lower, even more preferably 100° C. or lower, particularly preferably 40° C. to 85° C., and even more preferably 40° C. to 60° C.
• the melting point was measured in the same manner as described in the Examples.
• the elastic nonwoven fabric preferably contains an ⁇ -olefin copolymer (hereinafter also referred to as "specific ⁇ -olefin copolymer") having a ratio (E40/E23) of the storage modulus E40 at 40°C to the storage modulus E23 at 23°C of 37% or more.
• specific ⁇ -olefin copolymer having a ratio (E40/E23) of the storage modulus E40 at 40°C to the storage modulus E23 at 23°C of 37% or more.
• the ratio (E40/E23) is not particularly limited, and may be 100% or less, 95% or less, or 90% or less.
• An example of a method for setting the ratio (E40/E23) of the specific ⁇ -olefin copolymer within the above-mentioned specific range is to use a copolymer of ethylene and propylene as the ⁇ -olefin copolymer.
• the storage modulus E23 of the specific ⁇ -olefin copolymer is preferably 30 MPa or less, more preferably 22 MPa or less, further preferably 20 MPa or less, and particularly preferably 18 MPa or less.
• the storage modulus E23 of the specific ⁇ -olefin copolymer is preferably 5 MPa or more, more preferably 10 MPa or more.
• the storage modulus E40 of the specific ⁇ -olefin copolymer is preferably 10 MPa or less, more preferably 9 MPa or less.
• the storage modulus E40 of the specific ⁇ -olefin copolymer is preferably 3 MPa or more, more preferably 5 MPa or more.
• the elastic nonwoven fabric contains a specific ⁇ -olefin copolymer,
• the ratio of the specific ⁇ -olefin copolymer to the total amount of the elastic nonwoven fabric is 90% by mass to 100% by mass
• the specific ⁇ -olefin copolymer is preferably a copolymer of ethylene and propylene, and the melting point of the specific ⁇ -olefin copolymer is preferably 130° C. or lower.
• the resin composition (NW) may contain various known additives as optional components, such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the present disclosure.
• additives such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the present disclosure.
• the nonwoven laminate of the first embodiment may or may not include other layers depending on the application.
• the other layers are laminated to at least one of the extensible spunbond nonwoven fabrics.
• Other layers include nonwoven fabrics other than elastic nonwoven fabrics and extensible spunbond nonwoven fabrics, knitted fabrics, woven fabrics, films, etc.
• the method of further laminating (bonding) other layers to the nonwoven fabric laminate is not particularly limited, and examples include heat embossing, heat fusion methods (e.g., ultrasonic fusion, etc.), mechanical entanglement methods (e.g., needle punch, water jet, etc.), methods using adhesives (e.g., hot melt adhesives, urethane adhesives, etc.), extrusion lamination, etc.
• the nonwoven fabric laminate of the first embodiment may further have a film layer.
• the film layer may be an elastic film or a nonelastic film, and may or may not have breathability or moisture permeability.
• the film layer may be disposed on one side of the nonwoven fabric laminate (i.e., the extensible spunbond nonwoven fabric) or on both sides of the nonwoven fabric laminate (i.e., the extensible spunbond nonwoven fabric).
• the laminate may have a laminate configuration of elastic nonwoven fabric/film, elastic nonwoven fabric/film/elastic nonwoven fabric, or film/elastic nonwoven fabric/film.
• nonwoven fabrics other than elastic nonwoven fabrics and extensible spunbond 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 fabric that does not generate a return stress after being stretched in the machine direction (MD) or cross direction (CD).
• a breathable (moisture-permeable) film is preferred.
• breathable films include various known breathable films, such as films made of thermoplastic elastomers such as polyurethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers that have moisture permeability, and porous films made by stretching a film made of a thermoplastic resin containing inorganic or organic fine particles to make it porous.
• thermoplastic resins used for porous films polyolefins such as high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, polypropylene random copolymers, and combinations thereof are preferred.
• LLDPE linear low-density polyethylene
• polypropylene polypropylene random copolymers
• a film of a thermoplastic resin such as polyethylene, polypropylene, or a combination thereof may be used.
• the resin composition for extensible spunbonded nonwoven fabrics uses a propylene-based polymer (A) and a polymer (B) that is at least one selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters
• the thermoplastic resin of the non-elastic film is preferably polypropylene, an ⁇ -olefin copolymer (including a propylene-based random copolymer), or a combination thereof.
• the thermoplastic resin of the elastic film is preferably an ⁇ -olefin copolymer.
• Nonwoven fabric laminate of second embodiment The nonwoven fabric laminate of the second embodiment of the present disclosure comprises an elastic nonwoven fabric and an extensible spunbonded nonwoven fabric arranged on both sides of the elastic nonwoven fabric.
• the fibers contained in the extensible spunbonded nonwoven fabric (hereinafter also referred to as "extensible fibers") are islands-in-the-sea fibers.
• the islands-in-the-sea fibers are made of a resin composition for extensible spunbonded nonwoven fabrics.
• the resin composition for extensible spunbonded nonwoven fabrics contains a propylene-based polymer (A) containing a propylene homopolymer, and a polymer (B) which is at least one selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters.
• the average fiber diameter a of the fibers contained in the extensible spunbonded nonwoven fabric is smaller than the average fiber diameter b of the fibers contained in the elastic nonwoven fabric (hereinafter also referred to as "elastic fibers").
• the nonwoven fabric laminate of the second embodiment has the above-mentioned configuration, the occurrence of blocking can be suppressed even when the nonwoven fabric laminate is unwound from the nonwoven fabric roll at high speed (for example, 200 m/min). This effect is believed to be due to, but not limited to, the following reasons.
• By laminating the extensible spunbonded nonwoven fabric having a specific fiber diameter balance with the elastic nonwoven fabric it is possible to suppress the exposure of the elastic fibers to the surface of the nonwoven fabric laminate, and to reduce the tackiness of the surface of the nonwoven fabric laminate. Furthermore, if the texture of the extensible spunbonded nonwoven fabric is more uniform, better effects can be obtained.
• the nonwoven fabric laminate of the second embodiment has the same configuration as the nonwoven fabric laminate of the first embodiment, except that the surface coefficient represented by the above formula (1) of 38 or more is not an essential feature of the invention, the extensible fibers include specific sea-island type fibers, and the average fiber diameter a of the extensible fibers is smaller than the average fiber diameter b of the elastic fibers.
• the description of the nonwoven fabric laminate of the first embodiment may be used to describe the nonwoven fabric laminate of the second embodiment.
• the average fiber diameter a of the extensible fibers is smaller than the average fiber diameter b of the elastic fibers.
• the fiber ratio (b/a) of the average fiber diameter b of the elastic fibers to the average fiber diameter a of the extensible fibers is preferably 1.0 or more and 1.35 or less, and more preferably greater than 1.0 and 1.35 or less.
• the surface coefficient of the nonwoven fabric laminate is preferably 38 or more, more preferably 38 to 60, and even more preferably 38 to 50, from the viewpoint of further suppressing the occurrence of blocking even when the nonwoven fabric laminate is unwound from a nonwoven fabric roll at high speed (e.g., 200 m/min).
• the method for increasing the surface coefficient to 38 or more is the same as that exemplified in the first embodiment.
• the basis weight ratio (NW/total) of the nonwoven fabric laminate is not particularly limited, but is preferably 18% to 48%, which allows the nonwoven fabric laminate to have both elastic properties and blocking resistance during roll production.
• the weight ratio (NW/total) is more preferably 20% to 48%, further preferably 20% to 43%, and particularly preferably 25% to 43%.
• the total basis weight of the nonwoven fabric laminate is the same as that exemplified in the first embodiment.
• the nonwoven fabric laminate of the second embodiment includes an extensible spunbond nonwoven fabric.
• the basis weight of the extensible spunbond nonwoven fabric is the same as that exemplified in the first embodiment.
• the extensible spunbond nonwoven fabric comprises extensible fibers.
• the average fiber diameter a of the extensible fiber is the same as that exemplified in the first embodiment.
• the cross-sectional shape of the extensible fiber is not particularly limited, and examples include circular, elliptical, irregular cross-sections, etc.
• the extensible fiber of the second embodiment is an island-in-the-sea type fiber. Because the extensible fiber is an island-in-the-sea type fiber, the number of thread breaks that occur during spinning of the resin composition that is the raw material of the extensible spunbond nonwoven fabric is reduced. As a result, the productivity of the nonwoven fabric laminate is improved. Fewer thread breaks can reduce the number of fibers whose fiber ends are exposed on the nonwoven fabric surface, and can also improve the feel of the skin, such as a prickly feeling.
• Resin composition for extensible spunbond nonwoven fabric The islands-in-the-sea type fiber is made of a resin composition for extensible spunbond nonwoven fabric (hereinafter also referred to as “resin composition (SB)").
• the resin composition (SB) contains a propylene polymer (A) containing a propylene homopolymer (hereinafter also referred to as “specific propylene polymer (A)”) and a polymer (B).
• the specific propylene-based polymer (A) contains a propylene homopolymer, and may or may not contain a propylene copolymer.
• the propylene copolymer is the same as that exemplified in the first embodiment.
• the specific propylene-based polymer (A) preferably contains a propylene homopolymer, and more preferably is a propylene homopolymer.
• the melting point of the specific propylene-based polymer (A) is the same as the melting point of the propylene-based polymer (A) in the first embodiment.
• the MFR of the specific propylene-based polymer (A) is the same as the MFR of the propylene-based polymer (A) exemplified in the first embodiment.
• the content of the propylene homopolymer is preferably 0% by mass to 100% by mass, more preferably 20% by mass to 100% by mass, even more preferably 40% by mass to 100% by mass, particularly preferably 60% by mass to 90% by mass, and most preferably 70% by mass to 90% by mass, based on the total amount of the specific propylene polymer (A).
• the content of the specific propylene polymer (A) 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 resin composition (SB).
• the specific propylene polymer (A) may be a commercially available product.
• the specific propylene-based polymer (A) may be a biomass-derived propylene-based polymer.
• biomass-derived propylene-based polymer include those exemplified in the first embodiment.
• Polymer (B) is at least one selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters.
• the content of polymer (B) is preferably 5.0% by mass to 45.0% by mass, more preferably 5.0% by mass to 35.0% by mass, even more preferably 5.0% by mass to 25.0% by mass, and particularly preferably 5.0% by mass to 15.0% by mass, relative to the total amount of resin composition (SB).
• Polyolefin (excluding specific propylene polymer (A))
• the content of the polyolefin (excluding the propylene polymer (A)) and the content of the polyolefin (excluding the specific propylene polymer (A)) are the same as those exemplified in the first embodiment.
• the content of polyolefin (excluding the specific propylene-based polymer (A)) relative to the total amount of polymer (B) is preferably 90% by mass to 100% by mass, more preferably 95% by mass to 100% by mass, even more preferably 99% by mass to 100% by mass, and particularly preferably 100% by mass.
• polyester is the same as that exemplified in the first embodiment.
• the content of the polyester is preferably 0% by mass or more and less than 10% by mass, more preferably 0% by mass to 5% by mass, and even more preferably 0% by mass, based on the total amount of the polymer (B).
• the resin composition (SB) may contain, as optional components, various known additives such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the object of the present disclosure.
• various known additives such as antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, and hydrophilic agents, within the scope of the object of the present disclosure.
• the polymer (B) contains polyethylene having a density of 0.94 g/cm 3 to 0.97 g/cm 3 .
• the islands-in-sea type fiber preferably has an islands-in-sea structure in which the sea phase is a specific propylene-based polymer (A) (preferably a homopolymer of propylene) and the island phase is a polymer (B) (preferably a high-density polyethylene). This inhibits the orientation and crystallization of the main component of the sea phase, improving the extensibility of the extensible spunbonded nonwoven fabric.
• A propylene-based polymer
• B preferably a high-density polyethylene
• the nonwoven fabric laminate of the second embodiment includes an elastic nonwoven fabric.
• the elastic nonwoven fabric is the same as that exemplified in the first embodiment.
• the elastic nonwoven fabric preferably contains an ⁇ -olefin copolymer (hereinafter also referred to as a "specific ⁇ -olefin copolymer”) in which the ratio of the storage modulus E40 at 40°C to the storage modulus E23 at 23°C (E40/E23) is 37% or more.
• a specific ⁇ -olefin copolymer in which the ratio of the storage modulus E40 at 40°C to the storage modulus E23 at 23°C (E40/E23) is 37% or more.
• the elastic nonwoven fabric contains a specific ⁇ -olefin copolymer,
• the ratio of the specific ⁇ -olefin copolymer to the total amount of the elastic nonwoven fabric is 90% by mass to 100% by mass
• the specific ⁇ -olefin copolymer is preferably a copolymer of ethylene and propylene, and the melting point of the specific ⁇ -olefin copolymer is preferably 130° C. or lower.
• the nonwoven fabric laminate of the second embodiment may or may not have other layers depending on the application.
• the other layers are laminated on at least one of the extensible spunbonded nonwoven fabrics. Examples of the other layers include those similar to those exemplified in the first embodiment.
• the nonwoven fabric laminate of the second embodiment may further have a film layer.
• the film layer is the same as that exemplified in the first embodiment.
• the film layer may be disposed on one side of the nonwoven fabric laminate (i.e., the extensible spunbond nonwoven fabric) or on both sides of the nonwoven fabric laminate (i.e., the extensible spunbond nonwoven fabric).
• the nonwoven fabric laminate of the second embodiment further having a film layer, it is possible to provide a nonwoven fabric laminate suitable for various applications depending on the properties of the film.
• the film layer may be heat-welded to the extensible spunbond nonwoven fabric or may be bonded to the extensible spunbond nonwoven fabric using an adhesive.
• the stretchable nonwoven fabric laminate of the present disclosure is a stretch-processed product of the nonwoven fabric laminate of the first or second embodiment of the present disclosure.
• the stretchable nonwoven fabric laminate has stretchability.
• the stretchable nonwoven fabric laminate can be obtained by stretching the nonwoven fabric laminate of the present disclosure.
• the stretching method may be a partial stretching method or a full stretching method. It may be a uniaxial stretching method or a biaxial stretching method.
• An example of a method for stretching in the machine direction (MD) is a method in which the partially fused mixed fibers are passed through two or more nip rolls. In this case, the partially fused nonwoven fabric laminate can be stretched by increasing the rotation speed of the nip rolls in the machine machine direction.
• Gear stretching can also be performed using a gear stretching device as shown in Figure 1.
• the stretching ratio is preferably 50% or more, more preferably 100% or more, and even more preferably 200% or more.
• the stretching ratio is preferably 1000% or less, and more preferably 500% or less.
• both the elastic fiber and the extensible fiber are drawn.
• the extensible fiber undergoes plastic deformation and is elongated (i.e., lengthened) in accordance with the draw ratio.
• the elastic fibers elastically recover, while the extensible fibers fold without elastic recovery, resulting in a bulky feel in the nonwoven fabric laminate.
• the extensible fibers tend to become thinner. This is believed to improve the flexibility and touch, as well as provide stretch-resistance properties.
• the textile products of the present disclosure include the nonwoven fabric laminate of the first or second embodiment of the present disclosure or the elastic nonwoven fabric laminate of the present disclosure.
• the textile products are not particularly limited, and examples thereof include disposable diapers, absorbent articles such as sanitary products, hygiene articles such as masks, medical articles such as bandages, clothing materials, packaging materials, etc.
• the textile products of the present disclosure preferably include the nonwoven fabric laminate or elastic nonwoven fabric laminate of the present disclosure as an elastic member.
• the textile product of the present disclosure preferably further includes an engaging means.
• the textile product of the present disclosure functions as a removable stretchable sheet.
• the nonwoven fabric laminate of the present disclosure has excellent fit (rebound stress). Therefore, by stretching the textile product of the present disclosure and wrapping it around the human body or an article, and engaging it with the engaging means, the stretchable nonwoven fabric laminate can be adhered to the article or weakly pressed against it. In particular, even if the article to which the textile product of the present disclosure is adhered has an uneven shape, the textile product of the present disclosure can follow the uneven shape of the article.
• the textile product of the present disclosure is useful as a base material for bandages, gowns, clothing materials, bandages and poultices, and packaging materials.
• the nonwoven fabric laminate does not have other layers, the nonwoven fabric laminate has excellent breathability, so the textile product is also comfortable to wear.
• the engaging means may be a hook-and-loop fastener with an engaging protrusion, a mechanical fastening, a removable and re-adhesive adhesive tape, a claw, a clip, or the like.
• the engaging means may be a known engaging means.
• the engaging means may be provided for the purpose of preventing slippage by increasing the surface friction characteristics, or may be used as a non-slip treatment on a part of the nonwoven fabric laminate depending on the application.
• the engaging means may be provided on a part of the surface of the nonwoven fabric laminate for the purpose of temporarily fixing the tip of a bandage or a dressing.
• a crimped nonwoven fabric may be used as the mechanical fastening.
• a crimped nonwoven fabric using a propylene-based thermoplastic resin can be used to form a nonwoven fabric laminate made only of polyolefin raw materials, and a stretchable textile product with excellent recyclability can be provided.
• the absorbent articles of the present disclosure include the nonwoven fabric laminate of the present disclosure or the stretchable nonwoven fabric laminate of the present disclosure.
• the absorbent article may further include an absorbent body that absorbs liquid.
• the nonwoven fabric laminate of the present disclosure or the stretchable nonwoven fabric laminate of the present disclosure may be disposed in a position that contacts the wearer's skin when the absorbent article is worn.
• the mask of the present disclosure comprises the nonwoven laminate or stretchable nonwoven laminate of the present disclosure.
• the mask comprises a covering portion that covers at least a portion of the wearer's face and ear loops extending from both sides of the covering portion, and the ear loops may comprise a nonwoven fabric laminate of the present disclosure or a stretchable nonwoven fabric laminate of the present disclosure.
• the patch of the present disclosure includes the nonwoven fabric laminate or the stretchable nonwoven fabric laminate of the present disclosure.
• the term "patch" generally refers to a sheet (e.g., nonwoven fabric, woven fabric, etc.) having a paste layer formed on one side thereof.
• the patch may include a covering portion that covers at least a part of the wearer's body.
• the base material of the covering portion may include the nonwoven fabric laminate of the first or second embodiment of the present disclosure or the stretchable nonwoven fabric laminate of the present disclosure.
• the paste layer may be any known paste layer.
• the patch of the present disclosure is specifically used for covering products (e.g., compresses, etc.), patches, adhesive sheets for skin application, medical dressings, sterile sheets, or medical patches.
• the surfaces of the medical dressings, sterile sheets, and medical patches are each provided with a drug, medicine, therapeutic drug, patch, ointment, transdermal drug, transdermal agent, or patch.
• the melting point of the " ⁇ -olefin copolymer" described later is defined as the peak top of the peak observed on the lowest temperature side of the melting endothermic curve obtained by holding the sample at -100°C for 5 minutes under a nitrogen atmosphere and then heating at 10°C/min using a differential scanning calorimeter (DSC).
• the melting point can be determined as the peak top of the peak observed on the lowest temperature side of the melting endothermic curve obtained by holding 5 mg of a sample at -100°C for 5 minutes under a nitrogen atmosphere and then heating at 10°C/min using a differential scanning calorimeter (Perkin-Elmer, DSC-7).
• Outer layer (stretchable spunbond nonwoven fabric) [2.1.1] Raw materials for islands-in-the-sea fibers: "h-pp" (propylene homopolymer, MFR (measured in accordance with ASTM D1238 at 230°C and 2.16 kg load): 60 g/10 min, density: 0.91 g/cm 3 , melting point: 160°C) "HDPE" (high density polyethylene, MFR (measured in accordance with ASTM D1238 at a temperature of 190°C and a load of 2.16 kg): 5 g/10 min, density: 0.95 g/cm 3 , melting point: 134°C)
• Raw materials for core-sheath fiber "h-pp (MFR60)" propylene homopolymer, MFR (measured in accordance with ASTM D1238 at 230°C and 2.16 kg load) 60g/10min, density: 0.91g/cm 3 , melting point: 160°C h-pp (MFR 8.5): propylene homopolymer, MFR (measured in accordance with ASTM D1238 at a temperature of 230° C. and a load of 2.16 kg): 8.5 g/10 min, density: 0.91 g/cm 3 , melting point: 160° C.
• Fiber raw material " ⁇ -olefin copolymer” (manufactured by ExxonMobil, product name “Vistamaxx TM 7050FL", composition: propylene/ethylene copolymer, MFR (230°C, load 2.16 kg): 48 g/10 min, ethylene content: 13 mass%, tensile modulus: 9.82 MPa, storage modulus E23: 17.4 MPa, storage modulus E40: 8.77 MPa, ratio (E40/E23): 50.4%, melting point: 44.4°C)
• the spunbond nonwoven fabric constituting the intermediate layer (second layer) in Examples 1 to 8 and Comparative Examples 1 to 4 was made of fibers of a resin composition for elastic nonwoven fabrics having a storage modulus of 22.0 MPa or less, as described in the method of "[3] Nonwoven fabric laminate" below.
• the spunbond nonwoven fabric constituting the intermediate layer in Examples 1 to 8 and Comparative Examples 1 to 4 was an elastic nonwoven fabric.
• Example 1 A mixture of 94 parts by mass of "h-pp" and 6 parts by mass of "HDPE” was melted using a 75 mm ⁇ extruder, and melt spun by the spunbond method using a spunbond nonwoven fabric molding machine having a spinneret with 1093 holes (length in the direction perpendicular to the machine flow direction on the collecting surface: 320 mm) under conditions of resin temperature and die temperature both at 205° C., resin output rate of 38.7 kg/hour, cooling air temperature of 20° C., and stretching air speed of 2762 m/min, and an extensible spunbond nonwoven fabric consisting of islands-in-the-sea fibers was deposited on the collecting surface as a first layer.
• the " ⁇ -olefin copolymer" was melted using a single-screw extruder with a screw diameter of 75 mm ⁇ , and then melt-spun by the spunbond method using a spunbond nonwoven fabric molding machine (length perpendicular to the machine flow direction on the collection surface: 320 mm) having a spinneret (die, number of holes: 1093) under conditions of resin temperature and die temperature both 225°C, cooling air temperature 20°C, and stretching air speed 4667 m/min, to deposit an elastic nonwoven fabric (elastic spunbond nonwoven fabric) as a second layer.
• a spunbond nonwoven fabric molding machine length perpendicular to the machine flow direction on the collection surface: 320 mm
• spinneret die, number of holes: 1093
• the same islands-in-the-sea type fibers as in the first layer were deposited in the same manner to form a three-layer deposit.
• This pile was subjected to a heat and pressure treatment with an embossing roll (embossed area ratio 18%, embossing temperature 60° C.) to produce a nonwoven fabric laminate.
• the mass fraction of the elastic nonwoven fabric layer relative to the entire pile was 33.3%.
• the total basis weight, basis weight ratio (middle layer/whole) and formation coefficient of the nonwoven fabric laminate, the basis weight and average fiber diameter of the outer layers (i.e., the first and third layers) of the extensible spunbonded nonwoven fabric layers, and the basis weight and average fiber diameter of the middle layer (i.e., the second layer) of the elastic nonwoven fabric layer are shown in Table 1.
• Examples 2 to 7 and Comparative Examples 2 to 4 A nonwoven fabric laminate was obtained in the same manner as in Example 1, except that the total basis weight, basis weight ratio (middle layer/total), and formation coefficient of the nonwoven fabric laminate, the basis weight and average fiber diameter of the extensible spunbond nonwoven fabric layer, the air speed of the extensible spunbond and elastic nonwoven fabric, and the basis weight and average fiber diameter of the elastic nonwoven fabric layer were changed as shown in Tables 1 and 2.
• Example 8 "h-pp (MFR 8.5)" was melted using a 50 mm ⁇ extruder, and "h-pp (MFR 60)” was melted separately using a 75 mm ⁇ extruder. Then, using a spunbond nonwoven fabric molding machine (length in the direction perpendicular to the machine flow direction on the collection surface: 800 mm) having a spinneret (die, number of holes: 2887) capable of molding concentric core-sheath fibers in which "h-pp (MFR 8.5)" was the core and "h-pp (MFR 60)” was the sheath, composite melt spinning was performed by the spunbond method under conditions of resin temperature and die temperature both at 250° C., cooling air temperature of 20° C., and drawing air speed of 3750 m/min, and an extensible spunbond nonwoven fabric consisting of concentric core-sheath type fibers with a core/sheath mass ratio of 10/90 was deposited on the collection surface as a first layer.
• an elastic nonwoven fabric (elastic spunbond nonwoven fabric) was deposited on the deposition surface as a second layer in the same manner as in Example 1, except that the basis weight and average fiber diameter of the elastic nonwoven fabric layer were changed as shown in Table 2.
• the same core-sheath type fibers as in the first layer were deposited in the same manner to form a three-layer deposit.
• This pile was subjected to a heat and pressure treatment with an embossing roll (embossed area ratio 18%, embossing temperature 60° C.) to produce a nonwoven fabric laminate (mass fraction of the elastic nonwoven fabric layer relative to the entire mass was 33.3%).
• Table 2 shows the total basis weight, basis weight ratio (middle layer/whole), and formation coefficient of the nonwoven fabric laminate, the basis weight and average fiber diameter of the outer layers (i.e., the first and third layers) of the extensible spunbonded nonwoven fabric layers, and the basis weight and average fiber diameter of the middle layer (i.e., the second layer) of the elastic nonwoven fabric layer.
• Comparative Example 1 A nonwoven fabric laminate was obtained in the same manner as in Example 7, except that the total basis weight, basis weight ratio (middle layer/whole), and formation coefficient of the nonwoven fabric laminate, the basis weight and average fiber diameter of the extensible spunbonded nonwoven fabric layer, and the basis weight and average fiber diameter of the elastic nonwoven fabric layer were each changed as shown in Table 2.
• Reference Examples 1 to 3 A nonwoven fabric laminate was obtained in the same manner as in Example 1, except that the total basis weight, basis weight ratio (middle layer/whole), and formation coefficient of the nonwoven fabric laminate, the basis weight and average fiber diameter of the extensible spunbonded nonwoven fabric layer, and the basis weight and average fiber diameter of the elastic nonwoven fabric layer were each changed as shown in Table 3, and a film layer was further adhered onto the outer layer (extensible spunbonded nonwoven fabric) as shown in Table 3.
• the film layer was formed by extrusion laminating the resin having the composition shown in Table 3 to a thickness of 30 ⁇ m at 290° C. on the surface of the nonwoven fabric laminate, and bonding the film layer onto the extensible spunbonded nonwoven fabric.
• Blocking evaluation The jumbo roll with a winding length of 4000 m produced by the above manufacturing method was unwound from the bottom. The speed was gradually increased to 200 m/min, and then blocking evaluation was performed for 5 minutes. If there was no excessive adhesion between the layers of the jumbo roll and no breakage of the nonwoven fabric during the blocking evaluation, the blocking evaluation was rated as "A”. On the other hand, if there was excessive adhesion between the layers of the jumbo roll and the nonwoven fabric broke, the blocking evaluation was rated as "B”. The blocking was evaluated visually according to the above criteria. An acceptable blocking rating is "A".
• A The SB layer and the film layer did not peel off in all five tests, and peeling occurred between the SB layer and the other layers.
• outer layer refers to extensible spunbond nonwoven fabric.
• middle layer refers to elastic nonwoven fabric.
• C3/C2 in the carbon chain column indicates that the ⁇ -olefin copolymer is a propylene/ethylene copolymer.
• Base weight ratio refers to the ratio of the basis weight of the elastic nonwoven fabric to the total basis weight of the nonwoven fabric laminate.
• h-PP refers to homopolypropylene formed by polymerizing propylene alone.
• Comparative Examples 1 to 4 the surface coefficient of the nonwoven fabric laminate was less than 38. Therefore, the blocking evaluation for Comparative Examples 1 to 4 was "B.” From this result, it was found that the nonwoven fabric laminates of Comparative Examples 1 to 4 cannot suppress the occurrence of blocking when unwound from the nonwoven fabric roll at high speed.
• the nonwoven fabric laminates of Examples 1 to 8 each had an elastic nonwoven fabric and an extensible spunbond nonwoven fabric disposed on both sides of the elastic nonwoven fabric.
• the surface modulus was 38 or more. Therefore, the blocking evaluation for Examples 1 to 8 was "A.” This result shows that the nonwoven fabric laminates of Examples 1 to 8 can suppress the occurrence of blocking even when unwound from the nonwoven fabric roll at high speed.
• the nonwoven fabric laminates of Examples 1 to 7 included an elastic nonwoven fabric and an extensible spunbonded nonwoven fabric arranged on both sides of the elastic nonwoven fabric.
• the extensible fibers were islands-in-the-sea fibers.
• the islands-in-the-sea fibers were made of a resin composition for extensible spunbonded nonwoven fabrics.
• the resin composition for extensible spunbonded nonwoven fabrics contained a specific propylene-based polymer (A) and a polymer (B) which was a polyolefin (excluding the propylene-based polymer (A)).
• the average fiber diameter a of the extensible fibers was smaller than the average fiber diameter b of the elastic fibers. Therefore, the blocking evaluation for Examples 1 to 7 was "A.” This result shows that the nonwoven fabric laminates of Examples 1 to 7 can suppress the occurrence of blocking even when unwound from the nonwoven fabric roll at high speed.
• the first nonwoven fabric laminate includes Examples 1 to 6 among the examples.
• the first nonwoven fabric laminate comprises an elastic nonwoven fabric and an extensible spunbonded nonwoven fabric arranged on both sides of the elastic nonwoven fabric, and has a surface coefficient represented by the above formula (1) of 38 or more.
• the fibers contained in the extensible spunbonded nonwoven fabric are made of a resin composition for extensible spunbonded nonwoven fabrics, and the resin composition for extensible spunbonded nonwoven fabrics comprises a propylene-based polymer (A) and a polymer (B) which is at least one type selected from the group consisting of polyolefins (excluding the propylene-based polymer (A)) and polyesters.
• the second nonwoven fabric laminate includes Examples 1 to 4 among the examples.
• the second nonwoven fabric laminate has, in addition to the invention-specifying features of the first nonwoven fabric laminate, the invention-specifying feature that "the basis weight of the extensible spunbonded nonwoven fabric is 13 g/m 2 to 24.9 g/m.”

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• 2023
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