WO2024004475A1 - 人工皮革及びその製法 - Google Patents

人工皮革及びその製法 Download PDF

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Publication number
WO2024004475A1
WO2024004475A1 PCT/JP2023/019760 JP2023019760W WO2024004475A1 WO 2024004475 A1 WO2024004475 A1 WO 2024004475A1 JP 2023019760 W JP2023019760 W JP 2023019760W WO 2024004475 A1 WO2024004475 A1 WO 2024004475A1
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Prior art keywords
artificial leather
sheet
fibers
fiber
less
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English (en)
French (fr)
Japanese (ja)
Inventor
拓也 寺村
雅行 中谷
優花 林
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Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
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Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
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Priority to JP2024530394A priority Critical patent/JPWO2024004475A1/ja
Publication of WO2024004475A1 publication Critical patent/WO2024004475A1/ja
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes

Definitions

  • the present invention relates to artificial leather and its manufacturing method.
  • Artificial leather which is mainly composed of nonwoven fabric (entangled sheet) formed by intertwining fibers and polymeric elastic material, has excellent characteristics that are difficult to achieve with natural leather, such as easy care, functionality, and homogeneity. Suitable for clothing, shoes, bags, interior materials, interior materials for seats for automobiles, aircraft, railway vehicles, etc., and clothing materials such as ribbons, patch base materials, etc. It is used.
  • Patent Document 2 a dyed product composed of fibers with an average fiber diameter of 1.9 ⁇ m or more and 4 ⁇ m or less is pressed on the raised surface using a heating roll to create a nubuck-like surface with a high smoothness.
  • a method for obtaining artificial leather is described.
  • Patent Document 3 a fiber web composed of fibers with a single fiber fineness of 0.0001 to 0.5 dtex is integrated with a knitted scrim by needle punching, and the presence state of fibers on the surface and the average napped fiber length are adjusted.
  • This paper describes a method for obtaining suede-like artificial leather with a good texture while maintaining surface properties and without deteriorating surface quality.
  • JP2007-204863A Japanese Patent Application Publication No. 2016-186138 Japanese Patent Application Publication No. 2008-280643
  • nubuck-like artificial leather is required to have a more moist feel.
  • Artificial leather is also required to have wear resistance. In order to obtain a nubuck-like appearance and feel, it may be possible to reduce the diameter of the fibers that make up the nonwoven fabric and increase the fiber density, but when using a nonwoven fabric made of thin fibers, it is difficult to achieve high abrasion resistance. Difficult to equip.
  • Patent Document 1 artificial leather with a dense outer surface is obtained by forming the artificial leather into a laminate including a fiber web made of ultrafine fibers. However, since thin fibers of 0.0001 to 0.003 dtex are used, wear resistance is not sufficient.
  • smooth artificial leather is obtained by hot pressing the surface of the artificial leather. However, if only the surface is heated and pressed, the fiber density remains sparse, and the moist feeling required for nubuck-like artificial leather cannot be satisfied.
  • Patent Document 3 napped fibers are obtained by removing and smoothing the discontinuously covering polymeric elastic material on the surface of artificial leather, and performing a raising process until napped fibers account for 70 to 100%. . However, although the napping is sufficient, the smoothness is insufficient, so a moist feeling cannot be obtained sufficiently.
  • the problem to be solved by the present invention is to provide artificial leather that has both abrasion resistance and a moist feeling that is a characteristic of nubuck.
  • the present invention is as follows.
  • Artificial leather comprising an entangled sheet and an elastic polymer filled in the entangled sheet,
  • the entangled sheet has a two or more layer structure consisting of a fiber layer (A) on the front side of the artificial leather and a scrim in contact with the fiber layer (A),
  • the average diameter of the fibers constituting the fiber layer (A) is 2 ⁇ m or more and 7 ⁇ m or less
  • the raised area ratio (S) on the front side of the artificial leather satisfies the relationship 0.18 ⁇ S ⁇ 0.5; and (2)
  • the raised area ratio (S) on the front side of the artificial leather The actual volume of the protruding peak (Vmp) [mm 3 ] satisfies the relationship 1 ⁇ Vmp ⁇ 3; Artificial leather that satisfies the following.
  • a heating press step in which the sheet is pressed at a base fabric running speed of 15 to 25 m/min or less; (6) Optionally, a step of raising the outer surface of the entangled sheet; (7) Filling the obtained entangled sheet with an elastic polymer to obtain a sheet-like product; (8) If the above step (6) is not carried out, the step of raising the outer surface of the sheet-like material obtained in the above-mentioned step (7), or the above-mentioned step (6), and then a step of raising the outer surface; and (9) a step of dyeing the obtained sheet-like material;
  • a method for producing artificial leather including:
  • FIG. 1 is a conceptual diagram showing an example of the structure of artificial leather. Note that the fiber layer (B) with reference numeral 14 is optional.
  • FIG. 2 is a schematic diagram showing the nap of artificial leather.
  • FIG. 3 is a schematic diagram showing the state of dispersion of the nap of artificial leather.
  • FIG. 4 is a conceptual diagram illustrating how to determine the average diameter of the fibers constituting the fiber layer (A).
  • FIG. 5 is an explanatory diagram showing the sampling locations of the sample.
  • the artificial leather of this embodiment is an artificial leather including an entangled sheet and an elastic polymer filled in the entangled sheet,
  • the entangled sheet has a two or more layer structure consisting of a fiber layer (A) on the front side of the artificial leather and a scrim in contact with the fiber layer (A),
  • the average diameter of the fibers constituting the fiber layer (A) is 2 ⁇ m or more and 7 ⁇ m or less, Requirements (1) and (2) below: (1)
  • the total value of the area ratio of the raised portions on the front side of the artificial leather is 0.18 ⁇ S ⁇ 0.5; and (2)
  • the solid volume is 1 ⁇ Vmp ⁇ 3 [mm 3 ]; It is an artificial leather that satisfies the following.
  • artificial leather refers to "a special nonwoven fabric (mainly a fiber layer with a random three-dimensional structure) as a base material, polyurethane (PU) resin or similar flexible material” according to the Household Goods Quality Labeling Act. (impregnated with an elastomer having the following characteristics). Furthermore, according to the definition of JIS-6601, artificial leather is classified according to its appearance into “smooth”, which has the appearance of leather like silver, and “napp", which has the appearance of nubuck, suede, velor, etc. The artificial leather of the present embodiment relates to one classified as "nap” (that is, a nap-like artificial leather having a nap-like appearance).
  • the raised appearance can be formed by buffing (raising treatment) the outer surface (also referred to as the front surface) of the fiber layer (A) with sandpaper or the like.
  • the outer surface of the artificial leather, the outer surface of the fiber layer (A), the outer surface of the entangled sheet, the outer surface of the fiber sheet, and the outer surface of the laminated sheet are used as artificial leather. This is the surface that is exposed to the outside (for example, in the case of a chair, the surface that comes into contact with the human body).
  • the outer surface of the fiber layer (A) is raised or raised by buffing or the like.
  • Artificial leather has a structure of at least two or more layers consisting of a fiber layer (A) and a scrim in contact with the fiber layer (A).
  • the artificial leather may be composed of three layers, for example, a fiber layer (A), a scrim, and a fiber layer (B) constituting the back surface.
  • the fibers constituting the layer can be freely customized according to the functions and uses required of the artificial leather using the entangled sheet. For example, if ultrafine fibers are used in the fiber layer (A) and flame-retardant fibers are used in the fiber layer (B), both excellent surface quality and high flame retardance can be achieved. In addition, by creating a three-layer structure consisting of the fiber layer (A), the fiber layer (B), and the scrim sandwiched between them, the entanglement strength between the fiber layer (A) and the scrim tends to increase. But it's preferable.
  • the fibers constituting the fiber layers (fiber layer (A), optional fiber layer (B), and additional layers) constituting the artificial leather include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, etc. Synthetic fibers such as polyester fibers; polyamide fibers such as nylon 6, nylon 66, and nylon 12 are suitable. Among these, polyethylene terephthalate is preferable in consideration of applications requiring durability such as the car sheet field, since the fiber itself does not yellow even when exposed to direct sunlight for a long time and has excellent color fastness. Further, from the viewpoint of reducing environmental load, chemically recycled or materially recycled polyethylene terephthalate, polyethylene terephthalate using plant-derived raw materials, etc. are more preferable.
  • the average diameter of the fibers constituting the fiber layer (A) of the artificial leather is 2 ⁇ m or more and 7 ⁇ m or less. When the average diameter is 2 ⁇ m or more, sufficient wear resistance is likely to be obtained. On the other hand, if the average diameter is 7 ⁇ m or less, the distance between the fibers is short and a dense sample is likely to be obtained, so that the fluff is appropriately dispersed and a moist feel is likely to be obtained.
  • the average diameter of the fibers constituting the fiber layer (A) of the artificial leather is preferably 2.5 ⁇ m or more and 6 ⁇ m or less, more preferably 3 ⁇ m or more and 5 ⁇ m or less.
  • the fibers that are the raw materials for the fiber web that makes up the fiber layers (fiber layer (A), optional fiber layer (B), additional fiber layers, etc.) that make up the artificial leather include directly spun fibers and ultrafine fibers. Ultrafine fibers extracted from expressed fibers are preferred. By using directly spun fibers and microfibers extracted from microfiber-expressing fibers, the fibers in the fiber layer constituting the artificial leather can be easily dispersed into single fibers.
  • the fibers are dispersed as single fibers in at least the fiber layer (A).
  • microfiber-expressing fibers such as sea-island composite fibers (e.g., those using copolymerized polyester as the sea component and regular polyester as the island component)
  • the fibers are made into an entangled sheet with a scrim, and then fine fibers are formed.
  • the fibers obtained by chemical treatment (removal of the sea component of the sea-island composite fiber by dissolving, decomposing, etc.) exist as fiber bundles in the fiber layer (A), and are not dispersed as single fibers.
  • a sea-island type composite short fiber having an island component equivalent to a single fiber fineness of 0.2 dtex and 24 islands/1f is prepared, and after forming a fiber layer (A) with the sea-island type composite short fiber, needle punching treatment etc. After forming an entangled sheet with the scrim and filling the three-dimensional entangled body with PU resin, the sea component is dissolved or decomposed to obtain fibers with a single fiber fineness equivalent to 0.2 dtex. In this case, 24 single fibers are present in the fiber layer (A) in the form of a fiber bundle (equivalent to 4.8 dtex in the converged state).
  • the term "fibers are dispersed as single fibers” means that the fibers do not form fiber bundles obtained by, for example, removing the sea component of sea-island type composite fibers by dissolving, decomposing, etc. means.
  • the fibrous layer (A) is composed of fibers in which single fibers are dispersed, it has excellent surface smoothness and, for example, when the outer surface of the fibrous layer (A) is buffed or raised, a uniform raised layer is obtained. It is easy to obtain, and even when the adhesion rate of PU resin is relatively low, a pill-like appearance called pilling is unlikely to occur due to friction, so artificial leather with better surface quality and abrasion resistance can be obtained.
  • Methods for dispersing single fibers include a method in which ultrafine fibers produced by a direct spinning method are made into a fiber web by a papermaking method, and a method in which the sea component of a fiber sheet or entangled sheet made of sea-island composite fibers is dissolved or Examples include a method of promoting single fiber formation of the fiber bundle by subjecting the fiber bundle surface to a water dispersion treatment after decomposing the fiber bundle to generate an ultrafine fiber bundle.
  • fibers may or may not be dispersed in single fibers in the fiber layers other than the fiber layer (A), but in a preferred embodiment, fibers other than the fiber layer (A) may or may not be dispersed.
  • the layer is also composed of fibers in which single fibers are dispersed. It is preferable that the fibers constituting the layers other than the fiber layer (A) are dispersed as single fibers, so that the thickness of the artificial leather using the entangled sheet becomes uniform, the processing accuracy is improved, and the quality is stabilized.
  • the nap area ratio is preferably 0.25 or more and 0.5 or less, more preferably 0.32 ⁇ m or more and 0.5 ⁇ m or less.
  • the substantial volume of the protruding peaks on the outer surface of the artificial leather is 1 ⁇ Vmp ⁇ 3 [mm 3 ].
  • the actual volume of the protruding peak indicates the flatness of the outer surface of the artificial leather.
  • the dispersion state of the naps existing on the outer surface of the artificial leather is 20 ⁇ A ⁇ 60 [ ⁇ m]. If the dispersion state of the raised fluffs is 60 ⁇ m or less, the pitch interval of the raised fluffs is narrower than that of the fingerprint area, so that when the sample is pressed, the raised fluffs are likely to fill the fingerprint area, increasing the coefficient of static friction. On the other hand, if the dispersion state of the naps is 20 ⁇ m or more, there is a suitable distance between the naps, so pilling is less likely to occur and the abrasion resistance is good.
  • the dispersion state of the nap is preferably 20 ⁇ m or more and 45 ⁇ m or more, more preferably 20 ⁇ m or more and 40 ⁇ m or less.
  • the difference ( ⁇ s ⁇ k) between the static friction coefficient ( ⁇ s) and the dynamic friction coefficient ( ⁇ k) calculated from a friction test of artificial leather is 0.25 or more and 0.5 or less.
  • the difference between the static friction coefficient and the dynamic friction coefficient indicates the moist feel, which is an important tactile sensation of nubuck-like artificial leather.
  • the difference between the static friction coefficient and the dynamic friction coefficient in the above range can be obtained by controlling the nap area ratio and the substantial volume of the protruding peaks.
  • the difference between the static friction coefficient and the dynamic friction coefficient is preferably 0.28 or more and 0.5 or less, more preferably 0.3 or more and 0.5 or less.
  • the static friction coefficient is preferably 0.8 or more and 1.5 or less, more preferably 1.0 or more and 1.2 or less.
  • the dynamic friction coefficient is preferably 0.5 or more and 1.3 or less, more preferably 0.6 or more and 1.0 or less.
  • the basis weight of the fiber web (A') constituting the fiber layer (A) is determined from the viewpoint of mechanical strength such as abrasion resistance.
  • it is 10 g/m 2 or more and 200 g/m 2 or less, more preferably 30 g/m 2 or more and 170 g/m 2 or less, and even more preferably 60 g/m 2 or more and 170 g/m 2 or less.
  • the basis weight of the scrim is preferably 20 g/m 2 or more and 150 g/m 2 or less, more preferably 20 g/m 2 or more and 130 g/m 2 or less, even more preferably from the viewpoint of mechanical strength and entanglement between the fiber layer and the scrim. is 30 g/m 2 or more and 110 g/m 2 or less.
  • the fabric weight of the artificial leather made by impregnating a PU resin into an entangled sheet composed of two layers, a fiber layer (A) and a scrim is preferably 50 g/ m2 or more and 550 g/ m2 or less, more preferably 60 g/m2. It is 2 or more and 400 g/m 2 or less, more preferably 70 g/m 2 or more and 350 g/m 2 or less.
  • the basis weight of the fiber web (A') constituting the fiber layer (A) is determined by the wear resistance, etc. From the viewpoint of mechanical strength, it is preferably 10 g/m 2 or more and 200 g/m 2 or less, more preferably 30 g/m 2 or more and 170 g/m 2 or less, and still more preferably 60 g/m 2 or more and 170 g/m 2 or less.
  • the basis weight of the fiber web (B') constituting the fiber layer (B) is preferably 10 g/ m2 or more and 200 g/ m2 or less, more preferably 20 g/m2. 2 or more and 170 g/m 2 or less.
  • the basis weight of the scrim is preferably 20 g/m 2 or more and 150 g/m 2 or less, more preferably 20 g/m 2 or more and 130 g/m 2 or less, even more preferably from the viewpoint of mechanical strength and entanglement between the fiber layer and the scrim. is 30 g/m 2 or more and 110 g/m 2 or less.
  • the fabric weight of the artificial leather which is made by impregnating a PU resin into an entangled sheet composed of a three-layer structure of a fiber layer (A), a scrim, and a fiber layer (B), is preferably 60 g/m 2 or more and 750 g/m 2 or less. , more preferably 80 g/m 2 or more and 570 g/m 2 or less, still more preferably 70 g/m 2 or more and 520 g/m 2 or less.
  • the scrim can be, for example, a woven or knitted fabric, and is preferably composed of the same polymeric fibers as the fibers constituting the fiber layer (A) in view of the same color property when dyed.
  • the fibers constituting the fiber layer (A) are polyester-based
  • the fibers constituting the scrim are preferably polyester-based
  • the scrim is preferably polyester-based. It is preferable that the constituent fibers are also polyamide-based.
  • the scrim is preferably a single knit knitted with a gauge of 22 or more and 28 or less.
  • the structure of the woven fabric may be plain weave, twill weave, satin weave, etc., but plain weave is preferred from the viewpoint of cost and process aspects such as interlacing properties.
  • the yarn constituting the fabric may be monofilament or multifilament.
  • the single fiber fineness of the yarn is preferably 5.5 dtex or less since it is easy to obtain a flexible artificial leather using an entangled sheet.
  • the form of the yarn constituting the woven fabric it is preferable to use multifilament raw silk of polyester, polyamide, etc., or textured yarn subjected to false twisting, twisted at a twist number of 0 to 3000 T/m.
  • the multifilament may be a normal one, for example, 33dtex/6f, 55dtex/24f, 83dtex/36f, 83dtex/72f, 110dtex/36f, 110dtex/48f, 167dtex/36f, 166dtex/48f, etc. made of polyester, polyamide, etc. Preferably used.
  • the threads constituting the fabric may be multifilament long fibers.
  • the weaving density of the threads in the fabric is preferably 30 threads/inch or more and 150 threads/inch or less, more preferably 40 threads/inch or more and 100 threads/inch or less, in order to obtain artificial leather that is flexible and has excellent mechanical strength. be.
  • the fabric weight is preferably 20 g/m 2 or more and 150 g/m 2 or less.
  • the presence or absence of false twisting in the fabric, the number of twists, the fineness of the single fibers of the multifilament, the weaving density, etc. are determined by the degree of entanglement with the constituent fibers of the fiber layer (A), the flexibility of the artificial leather, the strength of the seams, Since it also contributes to mechanical properties such as tear strength, tensile strength and elongation, and elasticity, it may be selected as appropriate depending on the target physical properties and use.
  • the polymer elastic body constituting the artificial leather is preferably polyurethane (PU) resin.
  • PU resin is also used in the form of solvent-type PU resin in which PU resin is dissolved in an organic solvent such as N,N-dimethylformamide, and water-dispersed PU resin in which PU resin is emulsified with an emulsifier and dispersed in water.
  • an organic solvent is used.
  • a water-dispersed PU resin is preferable because it does not need to be used and can reduce the environmental burden.
  • the water-dispersed PU resin can be impregnated into the entangled sheet in the form of a dispersion in which the PU resin is dispersed with a desired particle size.
  • the filling form can be well controlled.
  • a self-emulsifying PU resin containing a hydrophilic group in the PU molecule, a forced emulsifying PU resin in which the PU resin is emulsified with an external emulsifier, etc. can be used.
  • a crosslinking agent can be used in combination with the water-dispersed PU resin for the purpose of improving durability such as heat and humidity resistance, abrasion resistance, and hydrolysis resistance. It is preferable to add a crosslinking agent in order to improve durability during jet dyeing, suppress fiber shedding, and obtain excellent surface quality.
  • the crosslinking agent may be an external crosslinking agent that is added to the PU resin as an additive component, or an internal crosslinking agent that introduces a reactive group that can form a crosslinked structure into the PU resin structure in advance.
  • Water-dispersible PU resins used for artificial leather generally have a crosslinked structure to provide resistance to dyeing processes, and therefore tend to be difficult to dissolve in organic solvents such as N,N-dimethylformamide.
  • the resinous substance is a water-dispersed PU resin.
  • PU resin is filled using a PU resin dispersion, and at that time, the average primary particle size of the PU resin in the dispersion is set to 0.1 ⁇ m or more.
  • the thickness is preferably .8 ⁇ m or less.
  • the average primary particle diameter is a value obtained by measuring a PU resin dispersion using a laser diffraction particle size distribution analyzer ("LA-920" manufactured by HORIBA).
  • the average primary particle diameter of the PU resin is preferably 0.1 ⁇ m or more and 0.6 ⁇ m or less, more preferably 0.2 ⁇ m or more and 0.5 ⁇ m or less.
  • the PU resin is impregnated in the form of an impregnating liquid such as a solution (for example, in the case of a solvent-dispersed type) or a dispersion (for example, in the case of a water-dispersed type).
  • an impregnating liquid such as a solution (for example, in the case of a solvent-dispersed type) or a dispersion (for example, in the case of a water-dispersed type).
  • the solid content concentration of the water-dispersed PU resin dispersion can be 3% by weight or more and 35% by weight or less, more preferably 4% by weight or more and 30% by weight or less, even more preferably 5% by weight or more and 25% by weight. % or less.
  • the impregnation liquid is prepared and the entangled sheet is impregnated so that the ratio of the PU resin to 100% by mass of the entangled sheet is 5% by mass or more and 50% by mass or less.
  • the PU resin is preferably one obtained by reacting a polymer diol, an organic diisocyanate, and a chain extender.
  • a polymer diol for example, polycarbonate-based, polyester-based, polyether-based, silicone-based, fluorine-based diols, etc. can be employed, and a copolymer of two or more of these may be used.
  • polycarbonate-based diols, polyether-based diols, or a combination thereof are preferably used.
  • polycarbonate-based, polyester-based diols, or a combination thereof are preferably used.
  • polyether diols polyester diols, or a combination thereof are preferably used.
  • Polycarbonate diols can be produced by transesterification of alkylene glycol and carbonate, reaction of phosgene or chloroformate, and alkylene glycol, and the like.
  • alkylene glycols examples include ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, and 1,10-decanediol.
  • Chain alkylene glycol branched alkylene glycol such as neopentyl glycol, 3-methyl-1,5-pentanediol, 2,4-diethyl-1,5-pentanediol, 2-methyl-1,8-octanediol; 1, Alicyclic diols such as 4-cyclohexanediol; aromatic diols such as bisphenol A; etc., and these can be used alone or in combination of two or more.
  • polyester diols include polyester diols obtained by condensing various low molecular weight polyols and polybasic acids.
  • low molecular weight polyols examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 2,2-dimethyl-1,3-propane.
  • One or more types selected from -1,4-dimethanol can be used.
  • adducts obtained by adding various alkylene oxides to bisphenol A can also be used.
  • polybasic acids include succinic acid, maleic acid, adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid, and hexahydrocarbonic acid.
  • isophthalic acid One or more types selected from the group consisting of isophthalic acid can be mentioned.
  • polyether diol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and copolymer diols that are a combination thereof.
  • the number average molecular weight of the polymer diol is preferably 500 to 4,000. By setting the number average molecular weight to 500 or more, more preferably 1500 or more, it is possible to prevent the texture from becoming hard. Further, by setting the number average molecular weight to 4000 or less, more preferably 3000 or less, the strength of the PU resin can be maintained well.
  • organic diisocyanates examples include aliphatic diisocyanates such as hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, and xylylene diisocyanate; aromatic diisocyanates such as diphenylmethane diisocyanate and tolylene diisocyanate; and combinations thereof. It may also be used. Among them, from the viewpoint of light resistance, aliphatic diisocyanates such as hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, and isophorone diisocyanate are preferably used.
  • an amine chain extender such as ethylenediamine and methylenebisaniline, or a diol chain extender such as ethylene glycol can be used.
  • a polyamine obtained by reacting polyisocyanate and water can also be used as a chain extender.
  • the impregnating liquid containing PU resin may contain stabilizers (ultraviolet absorbers, antioxidants, etc.), flame retardants, antistatic agents, pigments (carbon black, etc.) as necessary.
  • Additives may be added.
  • the total amount of these additives present in the artificial leather is, for example, 0.1 to 10.0 parts by weight, or 0.2 to 8.0 parts by weight, or 0.3 to 100 parts by weight, based on 100 parts by weight of the PU resin. It may be 6.0 parts by mass. Note that such additives will be distributed in the PU resin of the artificial leather.
  • the values are intended to include additives (if used).
  • the method for manufacturing artificial leather of this embodiment includes the following steps: The following steps: (1) Forming a fibrous web (A') from fibers with an average diameter of 2.0 ⁇ m or more and 7.0 ⁇ m or less; (2) A first hydroentangling step in which the obtained fibrous web (A') is hydroentangled at a water pressure of 2 to 5 MPa and an entanglement coverage of 60% or more to obtain a fibrous sheet (A); (3) a second hydroentangling step in which at least the fiber sheet (A) and the scrim are laminated and hydroentangled at a water pressure of 5 to 15 MPa and an entangled coverage of 80% or more to obtain an entangled sheet; (4) Using calender rolls, press the fiber sheet (A) side of the entangled sheet so that it is in contact with an unheated roll and the opposite side with a roll with a surface temperature of 105 to 135°C.
  • a heating press step in which the sheet is pressed at a base fabric running speed of 15 to 25 m/min or less; (6) Optionally, a step of raising the outer surface of the entangled sheet; (7) Filling the obtained entangled sheet with an elastic polymer to obtain a sheet-like product; (8) If the above step (6) is not carried out, the step of raising the outer surface of the sheet-like material obtained in the above-mentioned step (7), or the above-mentioned step (6), and then a step of raising the outer surface; and (9) a step of dyeing the obtained sheet-like material; including.
  • fibers formed into a sheet in a web forming process are referred to as a fiber web, fiber webs hydroentangled in a preliminary hydroentangling process as a fiber sheet, a fiber sheet as a scrim, and optionally added as a fiber sheet.
  • a laminated sheet is a laminated sheet with a fiber web or a fiber sheet
  • an entangled sheet is a laminated sheet that is hydroentangled in the main hydroentangling process
  • an entangled sheet is filled with a polymeric elastic material in a polymeric elastic material filling process.
  • leather is classified as a sheet-like material, and artificial leather is a colored sheet-like material.
  • the number of fiber layers constituting the artificial leather is not limited to one.
  • an artificial leather obtained using an entangled sheet having a three-layer structure consisting of a fiber layer (A), a scrim in contact with the fiber layer (A), and a fiber layer (B) in contact with the scrim. consists of two fibrous layers separated by a scrim.
  • the structures thereof are not limited to being the same.
  • the fiber layer on the outer surface side with ultra-fine fibers that are easy to obtain a smooth texture
  • composing the fiber layer on the opposite surface side with flame-retardant fibers that have a thick diameter and are difficult to obtain a smooth texture.
  • a fiber web (A'), an arbitrary fiber web (B'), and Additional methods for producing fibrous webs include direct spinning methods (e.g., spunbond method and melt-blown method), or methods of forming fibrous webs using short fibers (e.g., carding method, air-laid method, etc.). (dry method, wet method such as papermaking method), and both are preferably used.
  • a fibrous web produced using short fibers has a small density unevenness, excellent uniformity, and is easy to obtain uniform napping, so it is suitable for improving the surface quality of artificial leather.
  • the fibers that are the raw materials for the fiber web that makes up the fiber layers (fiber layer (A), optional fiber layer (B), additional fiber layers, etc.) that make up the artificial leather include directly spun fibers and ultrafine fibers. Ultrafine fibers extracted from fiber-expressing fibers are preferred. By using directly spun fibers and microfibers extracted from microfiber-expressing fibers, the fibers in the fiber layer constituting the artificial leather can be easily dispersed into single fibers.
  • the ultrafine fiber developing type fiber is a sea-island type fiber in which two thermoplastic resin components with different solvent solubility are used as a sea component and an island component, and the island component is made into ultrafine fiber by dissolving and removing the sea component using a solvent or the like.
  • peelable composite fibers in which fibers or two-component thermoplastic resins are arranged alternately in a radial or multilayered manner on the cross section of the fibers, and each component is peeled and split into ultrafine fibers.
  • sea-island type fibers are preferably used from the viewpoint of the flexibility and texture of the sheet-like material, since by removing the sea component, appropriate voids can be created between the island components, that is, between the fibers.
  • Sea-island composite fibers include sea-island composite fibers, in which two components, a sea component and an island component, are mutually arranged and spun using a sea-island composite spinneret, and a mixed fiber, in which two components, a sea component and an island component, are mixed and spun. There are spun fibers, etc. Sea-island composite fibers are preferably used because fibers with uniform fineness can be obtained and fibers with sufficient length can be obtained, contributing to the strength of the sheet-like product.
  • the sea component of the sea-island type fiber polyethylene, polypropylene, polystyrene, copolymerized polyester obtained by copolymerizing sodium sulfoisophthalic acid, polyethylene glycol, etc., and polylactic acid can be used.
  • copolymerized polyesters and polylactic acid which are copolymerized with alkali-decomposable sodium sulfoisophthalic acid, polyethylene glycol, and the like, which can be decomposed without using an organic solvent, are preferable.
  • the sea removal treatment is preferably performed before the polymer elastomer filling step. If the sea removal treatment is performed before the step of filling the elastic polymer, the structure will be such that the elastic polymer directly adheres to the fibers, and the fibers can be strongly gripped, thereby improving the abrasion resistance of the sheet-like article.
  • the short fiber length is preferably 13 mm or more and 102 mm or less, more preferably 25 mm or more and 76 mm or less, and even more preferably It is 38 mm or more and 76 mm or less, and preferably 1 mm or more and 30 mm or less, more preferably 2 mm or more and 25 mm or less, and still more preferably 3 mm or more and 20 mm or less, by a wet method (paper making method, etc.).
  • the aspect ratio (L/D), which is the ratio of length (L) to diameter (D), of short fibers used in a wet method (paper-making method, etc.) is preferably 500 or more and 2000 or less, more preferably It is 700-1500.
  • Such an aspect ratio is such that the short fibers have good dispersibility and spreadability in the slurry when the short fibers are dispersed in water to prepare the slurry, the fiber layer strength is good.
  • the fiber length is shorter and the single fibers are easily dispersed, so it is less likely to cause a pill-like appearance called pilling due to friction, which is preferable.
  • the fiber length of short fibers having a diameter of 4 ⁇ m is preferably 2 mm or more and 8 mm or less, more preferably 3 mm or more and 6 mm or less.
  • the hydroentangling step in the manufacturing process of artificial leather is a step in which only the fiber web (A') constituting the fiber layer (A) of the artificial leather obtained in the web forming step is hydroentangled to obtain a fiber sheet (A''). At least two layers of the first hydroentangled fiber sheet (A'') and the scrim are laminated, and the laminated at least two layers of laminated sheets are integrated by hydroentanglement to form an entangled sheet. It is preferable to include a second hydroentangling step to obtain. By hydroentangling only the fiber web (A') constituting the fiber layer (A) of the artificial leather, a sufficiently densified fiber sheet (A'') can be obtained.
  • the water pressure in the first hydroentangling step should be 2 to 5 MPa, and the water pressure in the second hydroentangling step should be 5 to 15 MPa. is preferred. If the water pressure of the first water entanglement is less than 2 MPa, the water flow during dyeing will cause fiber separation due to insufficient entanglement, while if it exceeds 5 MPa, the fiber density of the fiber web (A') is low, resulting in fiber separation. The degree of freedom is high, and excessive hydroentanglement creates coarse and dense fibers, impairing smoothness.
  • the second hydroentanglement is less than 5MPa
  • the water flow during dyeing will cause fiber separation due to insufficient entanglement
  • it exceeds 15MPa excessive hydroentanglement will cause the fibers to become coarse and dense, resulting in smoothness. sexuality is impaired.
  • the area to be hydroentangled (hereinafter referred to as hydroentangled coverage) relative to the area of the fiber web (A') in the first hydroentangled step must be 60% or more. It is preferable that the entanglement coverage ratio be 80% or more in the second hydroentanglement step. If the first hydroentanglement coverage is less than 60%, the degree of freedom of the fibers will increase due to insufficient entanglement, and if the second hydroentanglement is performed as it is, the fibers will be densely packed and the smoothness will be impaired.
  • the nozzle interval is the distance in the nozzle width direction between a nozzle hole and the nozzle hole that is closest to the nozzle hole in the nozzle width direction.
  • the hole diameter of the high-pressure water injection nozzle is preferably 0.05 mm or more and 0.40 mm or less in order to promote single fiber dispersion. More preferably, it is 0.05 mm or more and 0.30 mm or less, and even more preferably 0.10 mm or more and 0.25 mm or less.
  • the distance from the high-pressure water jetting surface to the object to be treated can preferably be 5 mm or more and 100 mm or less, from the viewpoint of the guiding cloth before water jet treatment and the process passability during water jet treatment. More preferably, it is 10 mm or more and 60 mm or less, and still more preferably 20 mm or more and 40 mm or less.
  • the entangled sheet has a three-layer structure consisting of a fiber layer (A), a scrim in contact with the fiber layer (A), and a fiber layer (B) in contact with the scrim, it is laminated as a laminated sheet.
  • the fibrous layer (B) is laminated in the form of a fibrous sheet (B'') in which only the fibrous web (B') is hydroentangled, or in the form of a fibrous web (B') without preliminary hydroentangling. That is, The fibrous layer (B) to be laminated as a laminated sheet can be in the state of a fibrous sheet (B'') in which only the fibrous web (B') is hydroentangled, or in the state of a fibrous web (B') without preliminary hydroentangling. , they may be stacked in either state.
  • the entangled sheet has a multilayer structure having a fiber layer (C) or more on the fiber layer (B) side in addition to the fiber layer (B), it also consists of the fiber layer (B) and the fiber layer (C) or more.
  • the multilayer portion may be laminated using the same concept as the fiber layer (B).
  • sea-island fibers are cut to a predetermined fiber length to form staples, and a fiber web formed through a card and a cross wrapper is entangled by a needle punch method. Hydroentanglement treatment is preferred.
  • circular motion of the nozzle or reciprocating motion perpendicular to the process direction allows the fibers to be evenly entangled, reduces water traces parallel to the process direction, and improves surface quality. This is preferable in that it improves.
  • Heat pressing can be performed to smooth the surface of the bonded sheet or sheet-like material or artificial leather.
  • the hot press include a plane press method and a calender roll method, but the calender roll method is particularly preferred since it allows continuous pressing.
  • the calendering method of the present invention the front surface of the bonded sheet, sheet-like material, or artificial leather is pressed with an unheated roll, and the opposite surface is contacted with a roll with a surface temperature of 105 to 135°C.
  • the roll temperature of the hot press be 105° C.
  • the press pressure be 6 N/cm or more and 14 N/cm or less.
  • the roll temperature is more preferably 110°C or more and 130°C, even more preferably 115°C or more and 125°C, and the press pressure is more preferably 7 N/cm or more and 13 N/cm or less, and even more preferably 8 N/cm or more and 12 N/cm or less. It is.
  • a napping treatment can be performed to form naps on the surface of the entangled sheet or sheet-like material.
  • the raising treatment can be performed by grinding using sandpaper, a roll sander, or the like. Further, by applying silicone or the like as a lubricant before the napping treatment, the napping treatment by surface grinding becomes easily possible, and the surface quality becomes very good.
  • the entangled sheet is impregnated with the polymer elastic material and then dried to fill the entangled sheet with the polymer elastic material.
  • the polymeric elastomer is preferably a water-dispersed polyurethane (PU) resin.
  • the water-dispersed PU resin is impregnated in the form of an impregnating liquid such as a dispersion liquid.
  • the concentration of the water-dispersed PU resin in the impregnation liquid can be, for example, 3 to 35% by mass.
  • an impregnation liquid is prepared and the entangled sheet is impregnated so that the ratio of the PU resin to 100% by mass of the entangled sheet is 5 to 50% by mass.
  • Water-dispersed PU resins are forcibly dispersed and stabilized using surfactants, and forced emulsification-type PU resins, which have a hydrophilic structure in the PU molecular structure and can be used in water even in the absence of surfactants. It is classified as a self-emulsifying PU resin that is dispersed and stabilized. Although any one may be used in this embodiment, it is preferable to use a forced emulsification type PU resin from the viewpoint of imparting heat-sensitive coagulability, which will be described later.
  • the concentration of water-dispersed PU resin controls the amount of attached water-dispersed PU resin, and a high concentration promotes the aggregation of PU resin.
  • the content is preferably 3% by mass or more and 35% by mass or less, more preferably 4% by mass or more and 30% by mass or less, and even more preferably 5% by mass or more and 30% by mass or less.
  • thermal coagulability refers to the property that when a PU resin dispersion is heated, when a certain temperature (thermal coagulation temperature) is reached, the fluidity of the PU resin dispersion decreases and it coagulates.
  • a PU resin dispersion is applied to an entangled sheet, then coagulated by dry heat coagulation, wet heat coagulation, hot water coagulation, or a combination thereof, and then dried. Apply PU resin to the entangled sheet. Dry coagulation is a practical method for coagulating water-dispersed PU resin dispersions that do not exhibit heat-sensitive coagulation properties in industrial production, but in this case, a migration phenomenon in which PU resin concentrates on the surface layer of a sheet material occurs. The texture of the sheet-like material filled with PU resin tends to be fixed.
  • the heat-sensitive coagulation temperature of the water-dispersed PU resin dispersion is preferably 40°C or more and 90°C or less.
  • the heat-sensitive coagulation temperature is preferably 40°C or more and 90°C or less.
  • heat-sensitive coagulants include inorganic salts such as sodium sulfate, magnesium sulfate, calcium sulfate, and calcium chloride, and radical reaction initiators such as sodium persulfate, potassium persulfate, ammonium persulfate, azobisisobutyronitrile, and benzoyl peroxide.
  • inorganic salts such as sodium sulfate, magnesium sulfate, calcium sulfate, and calcium chloride
  • radical reaction initiators such as sodium persulfate, potassium persulfate, ammonium persulfate, azobisisobutyronitrile, and benzoyl peroxide.
  • examples include agents.
  • a water-dispersed PU resin dispersion can be impregnated or applied onto an entangled sheet, and the PU resin can be coagulated by dry heat coagulation, wet heat coagulation, hot water coagulation, or a combination thereof.
  • the temperature of the wet heat coagulation is preferably at least the heat-sensitive coagulation temperature of the PU resin, and preferably at least 40°C and not more than 200°C.
  • the temperature of hot water coagulation is preferably higher than the heat-sensitive coagulation temperature of the PU resin, and is preferably 40 to 100°C.
  • the dry coagulation temperature and drying temperature are preferably 80 to 180°C. Productivity is excellent by setting the dry coagulation temperature and drying temperature to 80°C or higher, more preferably 90°C or higher.
  • thermal deterioration of PU resin and PVA resin can be prevented by setting the dry coagulation temperature and drying temperature to 180° C. or lower, more preferably 160° C. or lower.
  • the artificial leather is preferably dyed for the purpose of increasing its sensory value (ie, visual effect).
  • the dye may be selected according to the type of fibers constituting the entangled sheet; for example, disperse dyes can be used for polyester fibers, and acid dyes or metal-containing dyes can be used for polyamide fibers. can be used, and combinations thereof can also be used.
  • reduction washing may be performed after dyeing.
  • a dyeing method a conventional method well known to dyeing processors can be used.
  • the dyeing method it is preferable to use a jet dyeing machine because it is possible to dye the sheet-like material and at the same time impart a rolling effect to soften the sheet-like material.
  • the dyeing temperature is preferably 80°C or higher and 150°C or lower, although it depends on the type of fiber. By setting the dyeing temperature to 80°C or higher, more preferably 110°C or higher, the fibers can be dyed efficiently. On the other hand, by setting the dyeing temperature to 150°C or lower, more preferably 130°C or lower, deterioration of the PU resin can be prevented.
  • the artificial leather dyed in this manner is preferably subjected to soaping and, if necessary, reduction washing (that is, washing in the presence of a chemical reducing agent) to remove excess dye. It is also a preferred embodiment to use a dyeing aid during dyeing. By using a dyeing aid, the uniformity and reproducibility of dyeing can be improved. Further, in the same bath as dyeing or after dyeing, a finishing agent treatment using a softener such as silicone, an antistatic agent, a water repellent, a flame retardant, a light stabilizer, an antibacterial agent, etc. can be performed.
  • the artificial leather of this embodiment can be used as an interior material with a very elegant appearance as a surface material for furniture, chairs, wall materials, seats in the interior of vehicles such as automobiles, trains, and airplanes, ceilings, and interiors, shirts, jackets, and casual wear.
  • FIG. 1 shows sample collection locations.
  • two locations (sampling regions 1 and 2) in the machine direction (MD) of the fiber layer (A) or the artificial leather containing the fiber layer (A) are cut out into strips (indicated by dotted lines).
  • a cross section in the thickness (t) direction was prepared, and in this cross section, five approximately equal locations were selected in the CD direction orthogonal to the MD direction.
  • a total of 10 selected locations were subjected to SEM measurement, and the average diameter ( ⁇ m) of the single fibers constituting the fiber layer (A) was determined by the method described below.
  • Average diameter ( ⁇ m) of single fibers constituting the fiber layer (A) The average diameter of the fibers constituting the fiber layer (A) was determined by scanning one of the cross sections of the fiber layer (A) of the artificial leather selected in (1-0) above with a scanning electron microscope (SEM), using a "JSM” manufactured by JEOL. -5610'') at a magnification of 1500 times, ten fibers forming the cross section of the fiber layer (A) of the artificial leather were randomly selected, and the diameter of the cross section of the single fibers was measured. Similar measurements were made on all 10 cross sections selected in (1-0), and the arithmetic mean value of the measured values for a total of 100 fibers was taken as the average diameter of the single fiber.
  • FIG. 4 is a conceptual diagram illustrating how to determine the fiber diameter. For example, when the cross section A of the fiber is elliptical as shown in FIG. 4, the fiber diameter is defined as the distance c between the outer circumferences on the straight line b perpendicular to the midpoint P of the longest diameter a of the cross section A in the observed image.
  • the raised area ratio is the area ratio of raised areas to all fibers on the outer surface of artificial leather.
  • a 20 cm x 20 cm sample was placed on the stage of an optical microscope (OPTELICS HYBRID, Lesertec) so that the nap direction (the direction in which the naps lay down when stroked) was in the depth direction, and the naps were arranged in one direction in the depth direction by brushing. was applied.
  • the measurement conditions for the optical microscope are as follows: the objective lens is 20x, the number of pixels is 1024 x 1024 pixels, the step in the z direction is 5 ⁇ m, the measurement channel is GREEN, the peak detection is Fine Peek, the reduction rate is 1/2, and the number of patchwork sheets is 10.
  • Dispersion state of nap (A) [ ⁇ m]
  • the dispersion state of the naps is the distance between the naps on the outer surface of the artificial leather.
  • a plurality of bubbles are virtually placed between the naps using the thickness method from the final 10 images obtained in (1-2), and the average diameter of the virtual bubbles (hereinafter referred to as the dispersion state of the nap) ) was calculated, and the average value was calculated.
  • the coefficient was measured.
  • the static friction coefficient is the maximum value of the friction coefficient in the travel distance range of 0 mm to 20 mm
  • the dynamic friction coefficient is calculated from the average value of the friction coefficient in the travel distance range of 20 to 80 mm.From these, the static friction coefficient and dynamic friction coefficient, which are friction characteristics, are calculated.
  • the difference ( ⁇ s ⁇ k) was calculated. Furthermore, the above sample collection and measurement were performed a total of 10 times, and the average value of the difference ( ⁇ s ⁇ k) between the static friction coefficient and the dynamic friction coefficient was calculated.
  • Grade 5 The scrim is not exposed on the worn surface, the fiber layer is not worn, and no pilling is observed.
  • Grade 4 The scrim is not exposed on the worn surface, and the fiber layer is not worn, but pilling is visible.
  • Grade 3 The scrim is not exposed on the worn surface, and no pilling is observed, but the fiber layer is not worn. is worn out.
  • Grade 2 The scrim is not exposed on the worn surface, but the fiber layer is worn and pilling is also observed.
  • Grade 1 The scrim is exposed on the worn surface and pilling is also observed.
  • the abrasion resistance is defined as the average value (value rounded to the first decimal place) of the 15 points evaluated by the five people for the three pieces of artificial leather. For wear resistance, grades 3 to 5 are considered good (pass).
  • PET ultrafine short fibers Polyethylene terephthalate fibers with a single fiber average diameter of 4 ⁇ m were produced by a melt spinning method and cut into 5 mm lengths (hereinafter, single fiber polyethylene terephthalate fibers cut into 5 mm lengths are also referred to as "PET ultrafine short fibers”. ).
  • the PET ultrafine short fibers were dispersed in water and a fibrous web (A') having a basis weight of 140 g/m 2 was produced by a papermaking method.
  • a high-speed water stream first water entanglement
  • the fiber sheet (A′′) was obtained by drying at 100° C. using an air-through type pin tenter dryer.
  • a fiber web (B') with a basis weight of 80 g/ m2 was produced by dispersing PET ultrafine staple fibers in water and using the papermaking method as a fiber layer (B) on the opposite side of the outer surface of the artificial leather.
  • a scrim plain woven fabric made of polyethylene terephthalate fibers of 166 dtex/48 f with a basis weight of 95 g/m 2 was inserted between the fiber sheet (A'') and the fiber web (B') to form a laminated sheet with a three-layer structure. .
  • a high-speed water stream (second water entanglement) using a straight-flow jet nozzle is applied to the laminated sheet at a pressure of 15 MPa from the outer surface side and 15 MPa from the opposite side of the outer surface, so that the coverage rate is 80%.
  • the fiber layer was entangled and integrated with the scrim by water jetting as described above, and then dried at 100° C. using an air-through type pin tenter dryer to obtain an entangled sheet having a three-layer structure.
  • the outer surface of the entangled sheet was brought into contact with an unheated roll, and the opposite surface was brought into contact with a roll with a surface temperature of 120°C, the pressing pressure was 10 N/cm, and the base fabric running speed was 20 m/cm. min.
  • the surface roughness Ra of the calender roll was 0.5 ⁇ m, and pressing was performed by a calender method.
  • the outer surface of the entangled sheet was brushed using #400 emery paper.
  • the entangled sheet was impregnated with a water-dispersed polyurethane resin impregnating liquid having the composition shown in Table 1 below, and then heated and dried at 130°C using a pin tenter dryer, and then heated with hot water heated to 90°C.
  • the anhydrous sodium sulfate was extracted and removed by drying, and a sheet filled with water-dispersed polyurethane resin was obtained.
  • the ratio of the water-dispersed PU resin to the total fiber mass of this sheet-like material was 10% by mass.
  • the sheet-like material was dyed with a blue disperse dye ("BlueFBL" manufactured by Sumitomo Chemical Co., Ltd.) at a dye concentration of 5.0% owf at 130° C. for 15 minutes using a jet dyeing machine, and then subjected to reduction cleaning. Thereafter, it was dried at 100° C. for 5 minutes using a pin tenter dryer to obtain artificial leather having a three-layer structure.
  • BlueFBL blue disperse dye
  • Example 2 to 9 Except that the average diameter of the single fiber, the first water flow entangling water pressure, the first water flow entanglement coverage ratio, the second water flow entanglement water pressure, the second water flow entanglement coverage ratio, the roll temperature, and the press pressure were changed as shown in Table 1 below. According to the method of Example 1, an artificial leather having a three-layer structure was obtained.
  • the artificial leather according to the present invention has excellent moist feel and abrasion resistance, so it is suitable for use in interior materials, automobiles, aircraft, railway vehicle seats, interior materials, etc., and clothing products. is available.
  • the artificial leather according to the present invention can be used as an interior material with a very elegant appearance as a surface material for furniture, chairs, wall materials, seats, ceilings, interior interiors, etc. in vehicle interiors of automobiles, trains, airplanes, etc.
  • Uppers and trims of shoes such as shirts, jackets, casual shoes, sports shoes, men's shoes, and women's shoes, bags, belts, wallets, etc., clothing materials used for some of them, wiping cloths, polishing cloths, CD curtains It can be suitably used as an industrial material such as.
  • MD Process direction (machine direction) CD Width (horizontal) direction 11 Entangled sheet 12 Scrim 13 Fiber layer (A) 14 Fiber layer (B) A Cross section of the fiber when the cross section is elliptical a Longest diameter of cross section A b A straight line passing through the midpoint p of the longest diameter a and perpendicular to the longest diameter a c Distance between outer circumferences on the straight line b P Midpoint of the longest diameter a

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  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
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EP4455399A4 (en) * 2021-12-24 2025-04-23 Asahi Kasei Kabushiki Kaisha Artificial leather and method for producing the same

Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2017043859A (ja) * 2015-08-27 2017-03-02 東レ株式会社 シート状物およびその製造方法
WO2020129741A1 (ja) * 2018-12-21 2020-06-25 株式会社クラレ 立毛人工皮革及びその製造方法
WO2021085427A1 (ja) * 2019-10-30 2021-05-06 旭化成株式会社 人工皮革及びその製法
JP2022044227A (ja) * 2020-09-07 2022-03-17 東レ株式会社 人工皮革

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017043859A (ja) * 2015-08-27 2017-03-02 東レ株式会社 シート状物およびその製造方法
WO2020129741A1 (ja) * 2018-12-21 2020-06-25 株式会社クラレ 立毛人工皮革及びその製造方法
WO2021085427A1 (ja) * 2019-10-30 2021-05-06 旭化成株式会社 人工皮革及びその製法
JP2022044227A (ja) * 2020-09-07 2022-03-17 東レ株式会社 人工皮革

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4455399A4 (en) * 2021-12-24 2025-04-23 Asahi Kasei Kabushiki Kaisha Artificial leather and method for producing the same

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