WO2019181676A1

WO2019181676A1 - Napped artificial leather and method for manufacturing same

Info

Publication number: WO2019181676A1
Application number: PCT/JP2019/010177
Authority: WO
Inventors: 道憲藤澤; 和正井上
Original assignee: 株式会社クラレ
Priority date: 2018-03-19
Filing date: 2019-03-13
Publication date: 2019-09-26
Also published as: JPWO2019181676A1; TW201945617A; TWI797277B; JP7220202B2

Abstract

Provided is a napped artificial leather including a non-woven fabric that is an entangled body of a fiber bundle including a single fiber of filaments that have a single-fiber fineness of 0.05-1 dtex, and a first polymer elastic body added to the non-woven fabric, the napped artificial leather being configured so that: in a thickness-direction cross section, there are provided a napped fiber layer that has a thickness of 100 μｍ or greater and includes a napped single fiber, a first layer that is a 120-μｍ-thick region continuous to the napped fiber layer, and a second layer that is continuous to the first layer; and a bundled-fiber-bundle proportion that is the ratio of the number of bundled fiber bundles to the total number of fiber bundles included in the first layer and the second layer is greater in the first layer than in the second layer. Also provided is a method for manufacturing the napped artificial leather.

Description

Napped artificial leather and method for producing the same

The present invention relates to napped artificial leather preferably used as a surface material for clothing, shoes, furniture, car seats, miscellaneous goods, and the like.

Suede-like artificial leather, which is napped artificial leather, has a raised surface by raising the surface of a fiber substrate including a nonwoven fabric impregnated with a polymer elastic body. Napped artificial leather is required to have wear resistance. In addition, since the napped artificial leather is usually colored, friction fastness that is difficult to transfer to other materials by friction is also required.

Regarding the abrasion resistance of suede-like artificial leather, for example, in Patent Document 1 below, after extracting a component of a mixed fiber after applying a polymer elastic body in a leather-like sheet-like material composed of ultrafine fibers and a polymer elastic body A method for producing a suede-like artificial leather obtained by applying a polymer elastic body again is disclosed. Regarding the friction fastness of the suede-like artificial leather, the following Patent Document 2 describes a suede-like tone comprising an entangled nonwoven fabric composed of ultrafine fibers having an average single fineness of 0.1 denier or less and a polymer mainly containing polyurethane contained therein. Disclosed is a suede-like artificial leather in which a dye and a specific copolymer are added to the artificial leather. Further, regarding the friction fastness of nubuck-like artificial leather, which is said to be shorter than the suede-like artificial leather, Patent Document 3 listed below has a single fiber fineness of 0.0001 to 0.5 dtex and an apparent density of 0.300 to 0. Disclosed is a nubuck leather-like sheet-like material comprising 700 g / cm ³ of short fiber nonwoven fabric, having a nap length of 1 to 500 μm, and having no film-like material made of an elastic polymer.

JP-A-51-75178 Japanese Patent Laid-Open No. 11-217773 JP 2006-241620 A

Although the suede-like artificial leather obtained by the technique disclosed in Patent Document 1 has improved wear resistance, the texture becomes hard because the polymer elastic body directly holds the ultrafine fibers. Further, the suede-like artificial leather obtained by the technique disclosed in Patent Document 2 is given a copolymer texture after forming a fiber raised surface, and thus the surface texture seems to be hard. Moreover, the nubuck leather-like sheet-like material obtained by the technique disclosed in Patent Document 3 has low wear resistance.

By the way, a colored napped artificial leather may be required to have a fastness to clocking (friction color fading) that does not fade when rubbed with other fabrics. Conventionally, a coloring method with less color fading has been studied in order to improve the clocking characteristics of colored napped artificial leather. However, it has been difficult to sufficiently improve the clocking characteristics only by examining the coloring method.

An object of the present invention is to provide a napped artificial leather that has solved the above-described problems and is excellent in clocking characteristics in which fiber dropout is suppressed when rubbed against another fabric.

The present inventors diligently studied to improve the clocking characteristics of the colored napped artificial leather. And when the surface layer of the napped artificial leather and other fabrics rubbed and the napped fibers fell off, it was found that the fastness of clocking was lowered by the colored napped fibers adhering to the fabric. Based on this finding, the present inventors have studied to suppress the dropping of the fibers when the napped artificial leather rubs against the fabric. As a result, when the napped artificial leather is rubbed against the fabric, when the napped fiber has a short napped length, the root of the napped comes into contact with the fabric and rubs, and the broken fiber forms the fabric. It was found that it was taken in and contaminated the fabric. And while fixing the root of the napped fiber with resin and increasing the napped length of the napped fiber to make the napped layer thicker, the napped layer becomes a cushion and the root of the napped fiber becomes difficult to contact the fabric. The root of the napped fiber is fixed, and it is found that a napped artificial leather can be obtained in which the fiber is hardly cut and the fiber is prevented from falling off when rubbed against other fabrics. It was.

That is, one aspect of the present invention includes a nonwoven fabric that is an entangled body of fiber bundles containing a single fiber of a long fiber having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elastic body imparted to the nonwoven fabric. In the cross-section in the thickness direction, the napped artificial leather has a napped fiber layer having a thickness of 100 μm or more, which is a surface layer containing napped single fibers, and a first region having a thickness of 120 μm connected to the napped fiber layer. And a second layer that is a region connected to the first layer, and each of the first layer and the second layer includes a number of bundled fiber bundles with respect to the total number of fiber bundles. The napped artificial leather has a higher ratio of the number of bundles of bundled fibers, which is a ratio, in the first layer than in the second layer. According to such a napped artificial leather, the napped fiber layer having a thickness of 100 μm or more becomes a cushion when rubbed with the fabric, and the napped fibers can be prevented from being rubbed and worn by the fabric. In addition, the first layer fiber bundles forming the roots of the napped fibers form the bundled fiber bundles at a higher rate than the second layer fiber bundles, so that the napped fibers are not damaged. The base of the fiber can be made hard to wear, and the fiber can be prevented from coming off and falling off. As a result, according to such napped artificial leather, the fibers are prevented from falling off when rubbed against other fabrics. In addition, it is preferable that the bundled fiber bundle has a porosity of less than 7% from the viewpoint that abrasion of the napped fibers is sufficiently suppressed.

Further, in the napped artificial leather, the ratio of the number of bundles of bundled fibers in the first layer is 50% or more, and the ratio of the number of bundles of bundled fibers in the second layer is 20% or less. It is preferable from the viewpoint of excellent balance between maintenance and suppression of fiber dropout.

Further, the lightness L ^* value in the color coordinate space (L ^* a ^* b ^* color space) on the surface on the napped fiber layer side is preferably 50 or less from the viewpoint that the effect of improving the clocking characteristics becomes remarkable. .

Moreover, it is preferable that the single fibers forming the bundle of bundles of fibers are fixed by a second polymer elastic body that has entered the internal voids of the bundle of bundles of bundles. Further, the napped artificial leather preferably contains 0.5 to 3.0 g / m ² of the second polymer elastic body in the plane direction from the viewpoint that the ratio of the number of bundles of bundled fibers in the first layer can be sufficiently increased. .

Further, it is preferable that at least one of the napped fiber layer and the first layer contains silicone from the viewpoint that the napped fibers tend to be long and a napped fiber layer having a thickness of 100 μm or more is easily formed.

In addition, the monofilament contains a cation dyeable PET dyed with a cation dye or contains a PET colored with a pigment, so that deterioration of clocking characteristics due to dye discoloration can be suppressed. It is preferable from the point which can be performed. Moreover, since these fibers are easily worn, it is preferable from the viewpoint that the effect of improving the clocking characteristics becomes remarkable.

Another aspect of the present invention is a nonwoven fabric which is an entangled body of fiber bundles containing a single fiber of a long fiber having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elasticity imparted to the voids of the nonwoven fabric. Including a body, a step of preparing an artificial leather raw machine, a step of applying a second polymer elastic body and silicone to at least one surface of the artificial leather raw machine, and a surface provided with the second polymer elastic body and silicone A buffing process, and a method for producing napped artificial leather. According to such a manufacturing method, the above-mentioned napped artificial leather can be easily obtained.

Further, the above production method preferably includes a step of dyeing with a cationic dye after the step of buffing.

According to the present invention, it is possible to obtain a napped artificial leather that reduces the clocking characteristics and suppresses fiber dropout when rubbed with another fabric.

FIG. 1 is an example of a scanning electron microscope (SEM) photograph obtained by photographing a cross section in the thickness direction of the suede-like artificial leather of Example 1 at a magnification of 300 times. FIG. 2 is an example of an SEM photograph obtained by photographing the focused fiber bundle observed in the first layer of the suede-like artificial leather of Example 1 at a magnification of 1500 times. FIG. 3 is an example of an SEM photograph obtained by photographing the spread fiber bundle observed at the second layer of the suede-like artificial leather of Example 1 at a magnification of 1500 times. FIG. 4 is an example of an SEM photograph obtained by photographing a cross section in the thickness direction of the suede-like artificial leather of Example 1 at a magnification of 100, for explaining a method for measuring the thickness of the napped fiber layer.

First, an outline of the napped artificial leather of this embodiment will be described with reference to a drawing substitute photograph. FIG. 1 includes a nonwoven fabric that is an entangled body of long fiber bundles 1 containing 12 single fibers 1a having an average single fiber fineness of 0.2 dtex, and a polymer elastic body 2 that is imparted to the voids of the nonwoven fabric. It is an example of the scanning electron microscope (SEM) photograph which image | photographed the cross section of the thickness direction of the suede-like artificial leather 10 which is 500-micrometer-thick napped artificial leather 10 times. A part of the polymer elastic body 2 exists as a first polymer elastic body 2a outside the fiber bundle, and a part of the polymer elastic body 2 exists as a second polymer elastic body 2b in the fiber bundle so that the single fiber 1a is present. It sticks to and converges. Further, in FIG. 1, 5 is a raised fiber layer that is a surface layer containing raised

single fibers

1 a, 6 is a first layer containing a fiber bundle 1 connected to the raised

fiber layer

5, and 7 is a first layer 6. The 2nd layer containing the fiber bundle 1 connected to is shown.

In the suede-like artificial leather 10, as shown in FIG. 1, the napped fiber layer 5 is a surface layer having a thickness of 100 μm or more where napped fibers exist. The first layer 6 is a layer having a thickness of 120 μm from the boundary with the napped fiber layer 5, that is, the boundary that replaces the fiber bundle 1 with a single fiber. The second layer 7 is a layer in a region below a depth of 120 μm from the boundary with the napped fiber layer 5. The raised fiber layer 5 includes raised single fibers 1a. Further, the first layer 6 and the second layer 7 include a plurality of fiber bundles 1 formed of 12 single fibers 1a as circled in FIG. And the fiber bundle 1 contains the bundling fiber bundle mentioned later by which the single fiber was bundled. The ratio of the number of bundles of bundled fibers, which is the ratio of the number of bundles of bundles of fibers to the number of all fiber bundles 1 included in each of the first layer 6 and the second layer 7, is greater than that of the second layer 7. The first layer 6 is higher. In other words, the fiber bundle 1 contained in the second layer 7 has a lower ratio of the single fibers 1a being concentrated than the fiber bundle 1 contained in the first layer 6, and is a spread fiber bundle that is scattered. The ratio is high.

FIG. 2 is an example of an SEM photograph obtained by photographing the focused fiber bundle observed in the first layer 6 at a magnification of 1500 times. FIG. 3 is an example of an SEM photograph obtained by photographing the spread fiber bundle observed in the second layer 7 at a magnification of 1500 times. As shown in FIG. 2, the bundled fiber bundle means a state of a fiber bundle in which most of single fibers are fixed and there are few voids in the fiber bundle. On the other hand, the spread fiber bundle means a state of a fiber bundle in which most of the single fibers are not fixed as shown in FIG. 3 and are scattered, and there are many voids in the fiber bundle. More specifically, for example, the bundled fiber bundle has a porosity ratio of less than 7% in the fiber bundle, and the opened fiber bundle has a porosity ratio of more than 7% in the fiber bundle. It can be said that. Note that the porosity of the fiber bundle is the outside of the fiber bundle whose cross section faces the front in the SEM photograph of the suede-like artificial leather taken at a magnification of 300 times, that is, the fiber bundle whose side is hardly visible. It can be obtained by trimming the contour and performing image processing for binarizing the void portion and the non-void portion of the fiber bundle using image processing software. In FIG. 1 to FIG. 3, the outer periphery of a fiber bundle composed of 12 single fibers having a cross section facing the front is circled. In FIG. 1, 28 fiber bundles whose cross section faces the front are observed in the first layer, and 27 fiber bundles whose cross section faces the front are observed in the second layer.

In the suede-like artificial leather 10, the ratio of the number of focused fiber bundles, which is the ratio of the number of focused fiber bundles to the total number of fiber bundles included in each of the first layer 6 and the second layer 7, is The first layer 6 is higher than the second layer 7. And in the suede-like artificial leather of the present embodiment, the number of the bundles of fiber bundles in which the cross-section existing in the first layer faces the front is 50% or more, further 60% or more, especially It is preferable that it is 80% or more. On the other hand, in the fiber bundle in which the cross section present in the second layer faces the front, the number ratio of the bundled fiber bundle is preferably 20% or less, more preferably 10% or less. In such a case, it is possible to obtain a suede-like artificial leather that can suppress the dropping of fibers when rubbed against another fabric while maintaining a more supple texture.

Further, in the suede-like artificial leather 10, a napped fiber layer having a thickness of 100 μm or more, which is a surface layer including napped single fibers, is formed. The napped fiber layer that is the napped surface of the suede-like artificial leather has a thickness of 100 μm or more. Therefore, the napped fiber layer becomes a cushion when rubbed against the fabric, and the napped fibers are prevented from being rubbed and worn by the fabric. The thickness of the napped fiber layer is not particularly limited as long as it is 100 μm or more, but it is preferably 100 to 140 μm, and more preferably 100 to 120 μm from the viewpoint of appearance uniformity.

As described above, as exemplified by the suede-like artificial leather 10, the napped artificial leather according to the present embodiment includes a non-woven fabric that is an entangled fiber bundle containing single fibers of long fibers having a single fiber fineness of 0.05 to 1 dtex, And a first polymer elastic body applied to the nonwoven fabric. The napped artificial leather is a surface layer containing napped single fibers in a cross section in the thickness direction, a napped fiber layer having a thickness of 100 μm or more, and a first layer that is a region having a thickness of 120 μm connected to the napped fiber layer. And a second layer that is a region connected to the first layer, and each of the first layer and the second layer includes a plurality of fiber bundles. And some of those fiber bundles are bundled fiber bundles in which single fibers are bundled, and the remaining fiber bundles are spread fiber bundles in which single fibers are not bundled, the first layer and the second layer. The first layer has a form in which the ratio of the number of bundled fiber bundles, which is the ratio of the number of bundled fiber bundles to the number of all fiber bundles, is higher in the first layer than in the second layer. According to such a napped artificial leather, the napped fiber layer having a thickness of 100 μm or more becomes a cushion when rubbed with another fabric while maintaining a supple texture, and the napped fibers are rubbed against the other fabric. Wear is suppressed.

Hereinafter, the napped artificial leather of the present embodiment will be described in more detail while explaining an example of the manufacturing method.

The napped artificial leather includes, for example, a nonwoven fabric that is an entangled body of long fiber bundles containing single fibers having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elastic body that is imparted to the voids of the nonwoven fabric. The step of preparing the artificial leather raw machine, the step of applying the second polymer elastic body and silicone to at least one surface of the artificial leather raw machine, and buffing the one surface provided with the second polymer elastic body and silicone And a process including the steps.

An artificial leather raw machine is prepared that includes a non-woven fabric that is an entangled body of long fiber bundles containing single fibers having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elastic body that is imparted to the voids of the non-woven fabric. The process will be described.

Artificial leather raw machines, for example, melt-spun sea-island type composite fibers to produce webs, entangle the webs, and apply fiber shrinkage treatment such as heat shrinkage treatment with steam, hot water or dry heat to produce sea-island type composite fibers. It can be manufactured by forming a nonwoven fabric of fibers, impregnating and applying the first polymer elastic body to the nonwoven fabric of sea-island composite fibers, and removing sea components from the nonwoven fabric of sea-island composite fibers. Hereinafter, each process is demonstrated in order.

As a method for producing a web by melt spinning sea-island type composite fibers, a method of collecting long-fiber sea-island type composite fibers spun by a spunbond method or the like on a net without cutting to form a long fiber web Is mentioned. In addition, the formed web may be subjected to a fusion treatment in order to impart shape stability.

In addition, a long fiber means a continuous fiber that is not a short fiber intentionally cut after spinning. More specifically, for example, it means a filament or continuous fiber that is not a short fiber intentionally cut so that the fiber length is about 3 to 80 mm. It is preferable that the fiber length of the sea-island type composite fiber before the ultrafine fiber formation is 100 mm or more, and it can be technically manufactured and unavoidably cut in the manufacturing process. The fiber length may be km or more.

In the sea-island type composite fiber, the type of resin of the island component is not particularly limited. Specifically, for example, modified polyester such as polyethylene terephthalate (PET), isophthalic acid modified PET, sulfoisophthalic acid modified PET, cationic dyeable PET, aromatic polyester such as polybutylene terephthalate, polyhexamethylene terephthalate; polylactic acid Aliphatic polyester such as polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyhydroxybutyrate-polyhydroxyvalerate resin; nylon 6, nylon 66, nylon 10, nylon 11, nylon 12, nylon 6- Examples thereof include nylon such as 12, and fibers such as polyolefin such as polypropylene, polyethylene, polybutene, polymethylpentene, and chlorinated polyolefin. In addition, the napped artificial leather of this embodiment is usually colored and used. Therefore, when using a cationic dye as a dye for the purpose of improving friction fastness and suppressing a decrease in friction fastness due to color transfer of the coloring material, cationic dyeable PET may be used. preferable.

Also, as the sea component resin, a polymer having higher solubility in a solvent or decomposability with a decomposing agent than an island component resin is selected. A polymer having a low affinity with the island component polymer and having a melt viscosity and / or a surface tension smaller than the island component polymer under the spinning conditions is preferable from the viewpoint of excellent spinning stability of the sea-island composite fiber. Specific examples of such sea component resins include water-soluble polyvinyl alcohol resins (water-soluble PVA), polyethylene, polypropylene, polystyrene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, Examples thereof include styrene-ethylene copolymers and styrene-acrylic copolymers. Among these, water-soluble PVA is preferable from the viewpoint of low environmental load because it can be dissolved and removed by an aqueous medium without using an organic solvent.

The average fineness of the sea-island type composite fiber is not particularly limited. In addition, the average area ratio between the sea component and the island component in the cross section of the sea-island composite fiber is preferably 5/95 to 70/30, more preferably 10/90 to 50/50. The number of island component domains in the cross section of the sea-island composite fiber is not particularly limited, but is preferably about 5 to 1000, more preferably about 10 to 300, from the viewpoint of industrial productivity.

The entanglement process is a process of needle punching under the condition that at least one barb penetrates from both surfaces simultaneously or alternately after laminating a plurality of layers in the thickness direction using a cross wrapper or the like, Examples of the method include high pressure water entanglement treatment. Note that an oil agent or an antistatic agent may be added to the long fiber web at any stage from the spinning process to the entanglement treatment of the sea-island type composite fiber.

Then, the entangled long fiber web is subjected to fiber shrinkage treatment such as heat shrinkage treatment with steam, hot water or dry heat, or heat press treatment to adjust the entangled state or smoothed state of the long fiber web. By doing so, a nonwoven fabric of sea-island type composite fibers can be obtained.

Then, after impregnating the non-woven fabric of sea-island type composite fiber with a resin liquid containing the first polymer elastic body, the first polymer elastic body is solidified. Specific examples of the first polymer elastic body include polyurethane, acrylonitrile elastomer, olefin elastomer, polyester elastomer, polyamide elastomer, acrylic elastomer, and the like. Of these, polyurethane is preferred. Further, the resin liquid of the first polymer elastic body may be an emulsion or a solution. Polymeric elastic materials include pigments such as carbon black and dyes such as dyes, coagulation regulators, antioxidants, ultraviolet absorbers, fluorescent agents, antifungal agents, penetrants, antifoaming agents, lubricants, and repellents. A water agent, an oil repellent agent, a thickener, an extender, a curing accelerator, a foaming agent, a water-soluble polymer compound such as polyvinyl alcohol or carboxymethyl cellulose, inorganic fine particles, a conductive agent, and the like may be blended.

The first polymer elastic body is particularly preferably a crosslinked polyurethane impregnated with an emulsion containing a crosslinkable polyurethane. The crosslinked polyurethane is preferable because it is difficult to dissolve or swell even if a second polymer elastic polyurethane solution dissolved in a solvent is applied in a later step. Examples of the crosslinkable polyurethane include a polyurethane having an acidic group such as a carboxyl group and a sulfonic acid group and a functional group such as a hydroxyl group, and a polyurethane having a self-crosslinkable functional group, which can form a crosslinked structure. Specifically, for example, as a monomer unit that forms a polyurethane chain, a functional group having an acidic group such as a carboxyl group or a sulfonic acid group, a hydroxyl group or an amino group on the side chain of the polyurethane chain, or Examples include polyurethane containing a polyfunctional monomer unit that retains a self-crosslinkable functional group. In forming the cross-linked structure, the cross-linked structure is formed by blending, for example, a carbodiimide type cross-linking agent, an epoxy type cross-linking agent, an oxazoline type cross-linking agent, an aziridine type cross-linking agent together with an emulsion containing a cross-linkable polyurethane. It may be formed.

The content of the first polymer elastic body contained in the napped artificial leather is not particularly limited, but is preferably 5 to 50% by mass, and more preferably 8 to 45% by mass. When the content of the first polymer elastic body is too high, the flexibility tends to decrease. Moreover, when the content rate of a polymeric elastic body is too low, there exists a tendency for abrasion resistance to fall.

Then, by removing the sea component from the sea-island type composite fiber of the sea-island type composite fiber nonwoven fabric, a non-woven fabric that is an entanglement of a fiber bundle containing a single fiber having a single fiber fineness of 0.05 to 1 dtex, An artificial leather raw machine including the first polymer elastic body imparted to the gap is manufactured. Examples of the method for removing sea components from the sea-island type composite fibers include a method of treating the non-woven fabric of sea-island type composite fibers with a solvent or a decomposing agent that can selectively remove only the sea components. Then, the artificial leather raw machine may be sliced in the thickness direction as necessary to adjust the thickness, and finished into an artificial leather raw machine having a predetermined thickness.

The artificial leather raw machine thus obtained includes a non-woven fabric that is an entanglement of a fiber bundle containing a single fiber of a long fiber having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elasticity imparted to the void of the non-woven fabric. Including the body.

In the artificial leather raw machine thus obtained, the second polymer elastic body and silicone are applied to at least one surface on which napping is formed in a later step.

In the manufacturing method of the present embodiment, after performing the buffing treatment for forming napped on the surface on which the napped of the artificial leather raw machine is formed, after applying the resin liquid containing the second polymer elastic body, Dry to solidify the second polymer elastic body. By such treatment, the resin liquid containing the second polymer elastic body permeates into the voids of the fiber bundle containing the single filaments of the long fibers in the surface layer on the surface on which the napping of the artificial leather raw machine is formed. Then, by drying the resin liquid that has permeated into the voids of the fiber bundle, the loose single fibers forming the fiber bundle are focused and fixed on the second polymer elastic body. By such treatment, a bundle of bundled fibers including bundled single fibers as shown in FIGS. 1 and 2 is formed. After bundling the surface layer after forming a bundle of bundled fibers at a high rate on the surface layer, the roots of the napped fibers are firmly solidified, and even when rubbed against other fabrics, the roots of the napped fibers are less likely to wear. , The fiber is also prevented from coming off.

The second polymer elastic body applied to the surface on which the nappings of the artificial leather raw machine are formed may be the same as or different from the first polymer elastic body. Specific examples include polyurethane, acrylonitrile elastomer, olefin elastomer, polyester elastomer, polyamide elastomer, acrylic elastomer, and the like. Of these, polyurethane is preferred.

As the second polymer elastic body, in particular, a polyurethane solution containing a solvent type polyurethane dissolved in a known polyurethane solvent such as N, N-dimethylformamide (DMF) or anone is applied. It is preferable because it easily penetrates into the voids in the fiber bundle.

The amount of the second polymer elastic body applied to the surface of the artificial leather raw machine where napping is formed is 0.5 to 3.0 g / m ² in the planar direction of the napped artificial leather, and further 0.75. It is preferably ˜2.0 g / m ² . When the amount of the second polymer elastic body is within such a range, a high concentration of bundled fiber bundles can be formed that can firmly fix the vicinity of the fiber root without making the raised surface formed later too hard. It is preferable from the viewpoint that a napped fiber layer having a thickness of 100 μm or more including a single fiber having a proper length is easily formed by buffing. When the amount of the second polymer elastic body is too small, there is a tendency that the bundled bundle cannot be formed at a high rate. Moreover, when there is too much quantity of a 2nd polymer elastic body, there exists a tendency for it to become difficult to form a napped fiber layer with a thickness of 100 micrometers or more including the single fiber which raised a moderate length by buffing.

In addition, on the surface of the artificial leather raw machine where napping is formed, before performing the buffing treatment to form napping, further applying a solution or emulsion containing silicone, and then drying to give silicone Is preferred. By such a treatment, silicone penetrates into the voids of the fiber bundle containing the single filaments of the long fibers in the surface layer as well as the second polymer elastic body by the capillary phenomenon. The silicone applied in this way acts as a lubricant and facilitates the formation of napped lengths that form napped fiber layers having a thickness of 100 μm or more by buffing performed later. Specifically, when buffing a surface layer containing a bundle of bundled fibers at a high rate with sandpaper or emery paper as will be described later, the single fiber is cut too much and shortened by reducing friction with the single fiber. To suppress that.

As the silicone to be provided on the surface on which the napping of the artificial leather raw machine is formed, various silicones having film-forming properties, more specifically, amino-modified silicones are preferably used.

The amount of silicone applied to the surface on which the nap is formed is not particularly limited, but it is 0.05 to 0.7 g / m ² , more preferably 0.09 to 0.5 g / m ^2. preferable. When the amount of silicone is within such a range, a napped fiber layer having a thickness of 100 μm or more including napped fibers having an appropriate length is easily formed by buffing. When the amount of silicone is too small, the length of napped fibers tends to be short, and napped fiber layers having a size of 100 μm or more tend not to be formed. Moreover, when there is too much quantity of silicone, there exists a tendency for napping to become long too much or it becomes difficult to form napping.

The second polymer elastic body and silicone to be applied to the surface on which the nap is formed of the artificial leather raw machine described above is applied after a solution or emulsion containing them is applied, for example, by a coating method such as gravure coating, and then dried. It is given by making it. At this time, preferably, the second polymer elastic body and the silicone are more effectively permeated into the fiber bundle on the surface layer according to a method of applying gravure while pressurizing the artificial leather raw machine using a nip roll, for example. Can do. Further, the second polymer elastic body and silicone may be applied simultaneously or may be applied in separate steps. In addition, even after applying either the second polymer elastic body or the liquid containing silicone and then applying the other liquid before drying, the other liquid is applied after the previously applied liquid is dried. It may be applied.

Then, the second polymer elastic body of the artificial leather raw machine and the surface provided with silicone are buffed to obtain a suede-like artificial leather having a napped fiber layer of 100 μm or more. Buffing is preferably performed by buffing using sand paper or emery paper having a count of 120 to 600, more preferably about 240 to 600. In this way, a suede-like artificial leather having a raised surface in which fibers raised on one side or both sides are present is obtained.

Napped artificial leather is further subjected to shrinkage treatment and sag softening treatment to give flexibility to adjust the texture, reverse seal brushing treatment, antifouling treatment, hydrophilic treatment, lubricant treatment, softener Finishing treatment such as treatment, antioxidant treatment, ultraviolet absorber treatment, fluorescent agent treatment, and flame retardant treatment may be performed.

Napped artificial leather is usually colored. Examples of the coloring method include a method of coloring a single fiber forming a non-woven fabric with a pigment (original method), and a method of dyeing napped artificial leather that is not original.

Dye for dyeing napped artificial leather is appropriately selected depending on the type of fiber. For example, when the fiber is formed of a polyester resin, it is preferably dyed with a cationic dye or a disperse dye.

Specific examples of cationic dyes include oxazine-based cationic dyes such as C.I.Basic Blue 3, C.I. Basic Blue 6, C.I. ， Basic Blue 10, C.I. Basic Blue 12, C.I.Basic Blue75, C.I. Basic Blue 96; I. Basic Blue 54, C.I. I. Basic Blue159, C.I. I. Basic Red 29, C.I. I. Azo-based cationic dyes such as Basic Red 46; I. Coumarin-based cationic dyes such as Basic Yellow 40; I. Methine cationic dyes such as Basic Yellow 21; I. Azomethine cationic dyes such as Basic Yellow28; I. Xanthene-based violet cationic dyes such as BasicioViolet 11. These may be used alone or in combination of two or more.

Specific examples of disperse dyes include benzene azo dyes (monoazo, disazo, etc.), heterocyclic azo dyes (thiazole azo, benzothiazole azo, quinoline azo, pyridine azo, imidazole azo, thiophenazo, etc.), anthraquinone dyes. , Condensed dyes (quinophthalene, styryl, coumarin, etc.) and the like. These may be used alone or in combination of two or more.

As the dyeing method, a high-pressure liquid dyeing method, a jigger dyeing method, a thermosol continuous dyeing machine method, a sublimation printing method, or the like is used without particular limitation.

The napped artificial leather of the present embodiment is intended to improve clocking characteristics that do not cause color transfer to other fabrics when rubbed with other fabrics. Therefore, as a coloring method, from the point that napped artificial leather excellent in friction fastness can be obtained, it is dyed with an original dyeing method in which a pigment is mixed with a single fiber forming a non-woven fabric or dyed with a cationic dye that does not easily fade. Or a combination of these is particularly preferred.

Moreover, the napped artificial leather according to the present embodiment exhibits a remarkable effect particularly when it is dyed darkly. Specifically, when the napped artificial leather is colored in a dark color, when the napped artificial leather rubs against another fabric, the dye itself does not transfer to the other fabric, but is also colored by being worn away. The raised fibers may adhere to and contaminate other fabrics. In the napped artificial leather of the present embodiment, the fibers are particularly difficult to fall off due to wear, so that the colored fibers are prevented from dropping and adhering to other fabrics. From this point, the lightness L ^* value in the color coordinate space (L ^* a ^* b ^* color space) on the surface of the napped fiber layer of the napped artificial leather is 50 or less, and further 40 or less. A dark color is preferable from the standpoint that the effect of suppressing contamination of other fabrics due to dropping of colored fibers when rubbed with other fabrics becomes significant.

The napped artificial leather produced as described above has an average fineness of a single fiber forming a fiber bundle of 0.05 to 1 dtex, further 0.1 to 0.5 dtex, particularly 0.1 to 0. .3 dtex is preferred. When the average fineness of the single fibers forming the fiber bundle is less than 0.05 dtex, the fibers are likely to wear and fall off when rubbed against other fabrics. Moreover, when the average fineness of the single fiber which forms a fiber bundle exceeds 1.0 dtex, there exists a tendency for a napped fiber to become hard or the supple texture of napped artificial leather to fall.

The thickness of the napped artificial leather is not particularly limited, but is preferably 0.3 to 1.5 mm, more preferably 0.4 to 1.0 mm. The basis weight of the napped artificial leather is not particularly limited, but is preferably 150 to 600 g / m ² , more preferably 200 to 500 / m ² .

Further, the apparent density of the napped artificial leather is not particularly limited, but is 0.4 to 0.7 g / cm ³ , and further 0.45 to 0.6 g / cm ³ is a balance between a sense of fulfillment and a flexible texture. It is preferable from the standpoint that napped artificial leather is obtained.

The napped artificial leather according to the present embodiment as described above can provide a suede-like artificial leather that reduces the clocking characteristics and suppresses the fibers from dropping off when rubbed against another fabric. Preferably, when the lightness L ^* value in the color coordinate space (L ^* a ^* b ^* color space) on the surface of the napped fiber layer is colored in a dark color such as 50 or less, and further 40 or less, it will be described later. Thus, it is preferable that the clocking fastness measured is 4th grade or higher when dry and 3rd grade or higher when wet.

Hereinafter, the present invention will be described more specifically with reference to examples. The scope of the present invention is not limited by the examples.

[Example 1]
It contains polyethylene terephthalate (cation-dyeable PET) modified with tetrabutylphosphonium salt of sulfoisophthalic acid as the thermoplastic resin of the sea component as the thermoplastic resin of the sea component and the thermoplastic resin of the island component. A non-woven fabric of sea-island composite long fibers in which sea-island composite long fibers having a mass ratio of sea component / island component = 25/75 were three-dimensionally entangled was prepared.

Then, the first polyurethane was imparted by impregnating the polyurethane emulsion into the sea-island composite long fiber nonwoven fabric and drying it in a drying oven at 150 ° C. As the polyurethane emulsion, an emulsion containing a self-emulsifying type polyurethane that forms a crosslinked structure with a crosslinking agent after drying and blended with a carbodiimide-based crosslinking agent was used. Then, the sea component contained in the sea-island type composite long fiber is extracted and removed by dip nip while immersing the non-woven fabric of the sea-island type composite long fiber provided with the first polyurethane in 95 ° C. hot water for 20 minutes, By drying in a drying furnace at 120 ° C., a raw material for an artificial leather raw machine including a nonwoven fabric of cationic dyeable polyester fibers impregnated with the first polyurethane and the first polyurethane was obtained. Then, the nonwoven fabric provided with the first polyurethane was sliced in the thickness direction and divided into two to obtain an artificial leather raw machine. The obtained artificial leather raw machine includes a non-woven fabric that is an entanglement of a fiber bundle containing a single fiber of a cationic dyeable PET fiber having a single fiber fineness of 0.2 dtex, and a first polyurethane applied to the voids of the non-woven fabric. The content ratio of the first polyurethane was 10% by mass and the thickness was 0.65 mm.

Next, 2nd polyurethane was provided to the artificial leather raw machine. Specifically, a DMF solution of polyurethane (solid content 5%) was passed through a 55 mesh gravure roll and a backup roll on one surface of the artificial leather raw machine, and dried. The coating amount was 2.00 g / m ² at the time of drying. The first polyurethane did not dissolve or swell due to the application of the polyurethane DMF solution.

Then, a silicone solution (amino-modified silicone, solid content: 27.0%) is passed through a 150 mesh gravure roll and a backup roll on one surface of the artificial leather production machine to which the second polyurethane is applied. Worked and dried. The coating amount was such that 0.14 g / m ^{2 of} amino-modified silicone adhered during drying.

Then, the surface provided with the second polyurethane and silicone is buffed using sandpaper of # 240, # 400, and # 600 at a speed of 3.0 m / min. Got leather. In a dye solution at 90 ° C. containing Nichilon® Red-GL (manufactured by Nissei Kasei Co., Ltd.) 9.4% owf as a cationic dye and 90% acetic acid 1 g / L as a dyeing assistant. The bath was immersed for 40 minutes at a bath ratio of 1:30 and dyed red. And the process of soaping at 70 ° C. using a hot water bath containing 2 g / L of Solgin R as an anionic surfactant in the same dyeing bath was repeated twice. And after soaping, the dyed suede-like artificial leather was obtained by drying. 1 to 4 are SEM photographs of cross sections of the obtained suede-like artificial leather.

The obtained suede-like artificial leather was evaluated according to the following evaluation method.

<Measurement of napped fiber layer thickness>
An SEM photograph was obtained in which an arbitrary cross section parallel to the thickness direction of the suede-like artificial leather was photographed at 100 times with a scanning electron microscope. And the obtained SEM photograph was expanded to A4 size. And as shown in FIG. 4, in the SEM photograph expanded to A4 size, the curve A was drawn along the boundary with the 1st layer connected with the napped fiber layer. Moreover, the curve B was drawn along the boundary which connects the vertex of the napped fiber which forms a napped fiber layer. The straight line B was drawn along the apex of the napped fibers that were in focus on the cross section of the suede-like artificial leather. A plurality of straight lines Pn (P ₁ , P ₂ , P ₃ ... P ₁₂ ) parallel to the thickness direction were drawn at 100 μm intervals along the curves A and B. And the length of the line segment from the curve A to the curve B on the straight line Pn was measured, respectively. And the length of the line segment on each 12 different straight lines Pn was calculated | required, and those average values were calculated | required. The average value was similarly measured in five SEM photographs, and the average value of each average value was taken as the thickness of the napped fiber layer.

<Measurement of the number of bundles of bundled fibers in the first layer>
An SEM photograph was obtained in which an arbitrary cross section parallel to the thickness direction of the suede-like artificial leather was photographed at 300 times with a scanning electron microscope. And in the SEM photograph image | photographed by 300 time, the fiber bundle which the cross section which exists in the 1st layer which is a 120 micrometer thickness area | region from the boundary line of a napped fiber and a fiber bundle as shown in FIG. Identified. Then, the porosity of each fiber bundle was determined using image processing software image-plus. And among the porosity of each fiber bundle, the number of fiber bundles with less than 7% porosity where the fiber bundles are converged was counted. Then, the ratio of the number of fiber bundles having a porosity of less than 7% to the number of specified fiber bundles was obtained. Similarly, in the five SEM photographs, the ratio of the number of fiber bundles having a porosity of less than 7% was determined, and the average of these was used as the ratio of the number of bundled fiber bundles in the first layer.

<Measurement of the number of bundled bundles of the second layer>
In the lower layer portion of the region below the first layer as shown in FIG. 1, similarly to the “measurement of the ratio of the number of bundled fiber bundles in the first layer”, the porosity in the five SEM photographs is the same. The ratio of the number of fiber bundles less than 7% was obtained, and the average value of these was used as the ratio of the number of bundled fiber bundles in the second layer.

<Clocking fastness>
The clocking fastness when dry and wet was measured using an Atlas clock meter CM-5 (manufactured by ATLAS ELECTRIC DEVICES CO). In the case of fastness of clocking at the time of drying, a dry cotton white cloth is attached to a glass friction element, and a load of 900 g of the cotton white cloth attached to the friction element is provided on the surface on which the napped fiber layer of the suede-like artificial leather is formed. And made 10 reciprocations. Then, the cotton white cloth was removed, cellotape (registered trademark) was attached on the contaminated portion, and a 1.5 pound cylindrical load was rolled back and forth once, and then the cellotape was peeled from the cotton white cloth. On the other hand, in the case of fastness to clocking when wet, a wet white cotton cloth with excess water removed after being immersed in distilled water is attached to a glass friction element, and a napped fiber layer of a piece of suede-like artificial leather is attached. A cotton white cloth attached to a friction element was contacted with a load of 900 g on the surface formed with 10 and reciprocated 10 times. Then, after removing the cotton white cloth and drying at 60 ° C. or less, the cellophane was affixed on the contaminated portion, and a 1.5 pound cylindrical load was rolled back and forth once, and then the cellotape was peeled off from the cotton white cloth. Then, the fastness of clocking at the time of drying and wetness was determined by a gray scale for contamination (grade 5 to 1) of the color change of the cotton white cloth.

<Evaluation of fluff loss>
A metal plate serving as a load and a polyethylene sheet having a thickness of 1 mm were laminated in this order on the upper surface of the red rubber plug No. 20 having a diameter of 63 mm to produce a friction element having a total weight of 400 g. Then, the polyethylene sheet side of the friction element was covered with a white cloth (cotton mixed broad (E / C = 65/35)) and wound, and fixed with a rubber band in a state where the wrinkles were stretched. Then, a white cloth of a friction element was brought into contact with the surface on which the raised fiber layer of the suede-like artificial leather was formed, and the section of 25 cm was reciprocated four times at a speed of one reciprocation for 4 seconds. The load is only the weight of the friction element. Then, the adhesion of the dropped fiber (fluff) to the white cloth after 4 reciprocations was determined according to the following criteria. In addition, for example, the middle of the fourth grade and the fifth grade was judged as 4.5 grade.
Grade 5: No fluff adhered to the white cloth, and the level of contamination gray scale was Grade 5.
Grade 4: Very small fluff was sparsely attached to the white cloth, and the level was 4-5 grade for contamination gray scale.
Grade 3: Small fluff was sparsely attached to the white cloth, and it was at the gray scale grade 4 level for contamination.
Second grade: Small fluff adhered to the white cloth moderately, and the gray scale for contamination was grade 3-4.
1st grade: Many large and small fluffs adhered to the white cloth, and the level was 3rd grade or less of the gray scale for contamination.

<L ^* value>
Using a spectrophotometer (manufactured by Hitachi High-Tech Science Co., Ltd .: U-3010), L ^* a ^* b * of the surface of the napped fiber layer of the dyed suede-like artificial leather cut out according to JISZ 8729 The brightness L ^* was determined from the coordinate values of the color system. The value is an average value of three points measured by uniformly selecting an average position from the test piece.

<Pilling properties>
Piling (pilling) of the surface on which the napped fiber layer of the test piece of suede-like artificial leather is formed in accordance with JIS L 1076 (Pilling test method for woven and knitted fabrics) A method (method using an ICI type pilling tester) The occurrence of was evaluated. Specifically, a 100 mm × 120 mm test piece was wound around a rubber tube for a pilling test with the napped fiber layer facing outward. A set of four test pieces wound around a rubber tube is put into a cubic rotary box with a cork plate lined at a side of 23 cm inside the ICI-type pilling tester. Or rotated for 20 hours. Then, the test piece was removed from the rubber tube, and the test piece was compared with a standard picture of pilling judgment, and the grade of occurrence of pilling was judged from grade 5 (good) to grade 1 (bad).

<appearance>
The raised surface of the obtained suede-like artificial leather was evaluated as follows. The tactile sensation of the surface was confirmed on five monitors, and the uniformity and roughness were judged according to the following criteria.
A: Three or more people judged that the surface was uniform and had a good appearance with no roughness.
B: Three or more people determined that the surface was inhomogeneous and rough and rough.

<Texture>
The obtained suede-like artificial leather was folded, and the difference in waist and flexibility compared with the suede-like natural leather was judged by five monitors based on the following criteria.
A: Three or more people judged that the texture was excellent in balance between fulfillment and flexibility.
B: Three or more persons determined to have a hard texture.

The results are shown in Table 1.

[Example 2]
In the same manner as in Example 1, except that the second polyurethane solution was applied at a coating amount of 1.25 g / m ² instead of being applied at a coating amount of 2.00 g / m ² at the time of drying. Suede artificial leather was manufactured and evaluated. The results are shown in Table 1.

[Example 3]
In the same manner as in Example 1, except that the second polyurethane solution was applied at a coating amount of 0.75 g / m ² instead of being applied at a coating amount of 2.00 g / m ² at the time of drying. Suede artificial leather was manufactured and evaluated. The results are shown in Table 1.

[Example 4]
In Example 1, isophthalic acid 6 having a single fiber fineness of 0.1 dtex and no cationic dyeability was used instead of the nonwoven fabric which is an entangled fiber bundle containing a single fiber of a cationic dyeable PET having a single fiber fineness of 0.2 dtex. A nonwoven fabric that is an entangled body of fiber bundles containing single fibers of mol% -modified PET is formed, and the content of the first polyurethane is changed to 14 mass% instead of 10 mass%, and the second polyurethane solution is dried. It was produced artificial leather except for coating with the coating amount of 1.25 g / m ^2, instead of coating with the coating amount of 2.00 g / m ² in the same manner at the time. Then, instead of dyeing the suede-like artificial leather with a cationic dye, it was dyed with a disperse dye and dyed by alkali reduction, acid washing, and water washing treatment to obtain a napped artificial leather. Then, the obtained napped-tone artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 5]
In Example 1, a single fiber fineness of 0.1 dtex containing 5.0% by mass of carbon black instead of a nonwoven fabric which is an entangled fiber bundle containing a single fiber of cationic dyeable PET having a single fiber fineness of 0.2 dtex. A non-woven fabric which is an entanglement of a fiber bundle containing a single fiber of 6 mol% of isophthalic acid-modified PET is formed and changed to 14 mass% instead of 10 mass% of the first polyurethane, and the second polyurethane A suede-like artificial leather was produced in the same manner except that the above solution was applied at a coating amount of 1.25 g / m ² instead of coating at a coating amount of 2.00 g / m ² at the time of drying. Then, instead of dyeing the suede-like artificial leather with a cationic dye, it was dyed with a disperse dye and dyed by alkali reduction, acid washing, and water washing treatment to obtain a napped artificial leather. Then, the obtained napped-tone artificial leather was evaluated in the same manner as in Example 1.
The results are shown in Table 1.

[Example 6]
In the same manner as in Example 1, except that the second polyurethane solution was applied at a coating amount of 0.40 g / m ² instead of being applied at a coating amount of 2.00 g / m ² at the time of drying. Suede artificial leather was manufactured and evaluated. The results are shown in Table 1.

[Example 7]
In Example 1, instead of a non-woven fabric which is an entangled fiber bundle containing a single fiber of a cationic dyeable PET having a single fiber fineness of 0.2 dtex, a single unit of 6 mol% modified isophthalic acid having a single fiber fineness of 1.0 dtex is used. A nonwoven fabric which is an entangled body of fiber bundles containing fibers was formed, and napped-tone artificial leather was obtained in the same manner as in the examples. Then, the obtained napped-tone artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 1]
In Example 1, a suede-like artificial leather was produced and evaluated in the same manner except that the step of applying the second polyurethane and silicone was omitted. The results are shown in Table 1.

[Comparative Example 2]
In Example 3, instead of buffing after the step of applying the second polyurethane and silicone, a suede-like artificial leather was produced in the same manner except that buffing was performed before the step of applying the second polyurethane and silicone. evaluated. The results are shown in Table 1.

[Comparative Example 3]
In Example 1, instead of buffing after the step of applying the second polyurethane and silicone, buffing was performed before the step of applying the second polyurethane, and the solution of the second polyurethane was 2.00 g / d in the dry state. was coated at a coat weight of 0.40 g / m ^2, instead of coating with the coating amount of m ^2, but omitting the step of applying the silicone in the same manner to produce a suede-like artificial leather was evaluated . The results are shown in Table 1.

[Comparative Example 4]
In Example 4, a suede-like artificial leather was produced and evaluated in the same manner except that the step of applying the second polyurethane and silicone was omitted. The results are shown in Table 1.

[Comparative Example 5]
In Example 4, a suede-like artificial leather was produced and evaluated in the same manner except that a DMF solvent and silicone were added instead of the second polyurethane. The results are shown in Table 1.

From the results in Table 1, the suede-like artificial materials obtained in Examples 1 to 7 having napped fiber layers having a thickness of 100 μm or more and having a higher number of bundled fiber bundles in the first layer than in the second layer It can be seen that all of the leathers had a fasting clocking degree of 4 or more when dry, a grade of 3 or more when wet, and a fluff removal rating of 3.5 or more. Moreover, it was excellent in pilling property, appearance, and texture. On the other hand, in the suede-like artificial leather of Comparative Example 1 in which the step of applying the second polyurethane and silicone is omitted, the napped fiber layer is thinner than the suede-like artificial leather of Example 1, and the first layer The number of bundles of bundled fibers was also low. The fastness to clocking was 2.5 when wet, and the fluff removal rating was 3.5. In addition, the suede-like artificial leather of Comparative Example 2 buffed before the step of applying the second polyurethane and silicone has a napped fiber layer that is thinner than the suede-like artificial leather of Example 3, and the first The ratio of the number of bundles of bundled fibers in this layer was also low. The fastness to clocking was grade 3 when dry and grade 2.0 when wet, and the pilling property, appearance and texture were inferior.

The suede-like artificial leather obtained by the present invention is preferably used as a skin material for clothing, shoes, furniture, car seats, miscellaneous goods, and the like.

Claims

A napped artificial leather comprising a non-woven fabric which is an entangled body of fiber bundles containing a single fiber having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elastic body applied to the non-woven fabric,
In a cross section in the thickness direction, a napped fiber layer having a thickness of 100 μm or more, which is a surface layer including a single raised fiber, a first layer that is a 120 μm thick region connected to the napped fiber layer, and the first layer A second layer that is a region connected to the layer,
The ratio of the number of bundled fiber bundles, which is the ratio of the number of bundled fiber bundles to the total number of fiber bundles, included in each of the first layer and the second layer, is higher than that of the second layer. Napped artificial leather with higher layers.
The napped artificial leather according to claim 1, wherein the ratio of the number of bundles of bundled fibers in the first layer is 50% or more, and the ratio of the number of bundles of bundled fibers in the second layer is 20% or less.
The napped artificial leather according to claim 1 or 2, wherein the bundle of bundled fibers has a porosity of less than 7%.
The napped artificial leather according to any one of claims 1 to 3, wherein a lightness L * value in a color coordinate space (L * a * b * color space) of the surface on the napped fiber layer side is 50 or less.
The napped artificial leather according to any one of claims 1 to 4, wherein the single fibers forming the bundle of bundles of fibers are fixed by a second polymer elastic body that has penetrated into an internal space of the bundle of bundles of bundles. .
The napped artificial leather according to any one of claims 1 to 5, comprising 0.5 to 3.0 g / m 2 of the second polymer elastic body in a planar direction.
The napped artificial leather according to any one of claims 1 to 6, wherein at least one of the napped fiber layer and the first layer contains silicone.
The napped artificial leather according to any one of claims 1 to 7, wherein the single fiber includes cationic dyeable PET dyed with a cationic dye.
The napped artificial leather according to any one of claims 1 to 8, wherein the single fiber includes PET colored with a pigment.
It is a manufacturing method of napped artificial leather according to claim 1,
An artificial leather raw machine comprising a non-woven fabric that is an entangled body of long fiber bundles containing a single fiber having a single fiber fineness of 0.05 to 1 dtex, and a first polymer elastic body imparted to the voids of the non-woven fabric is prepared. And a process of
Providing a second polymer elastic body and silicone on at least one surface of the artificial leather raw machine;
Buffing the one surface to which the second polymer elastic body and silicone are applied, and a method for producing napped artificial leather.
The method for producing napped artificial leather according to claim 10, further comprising a step of dyeing with a cationic dye after the step of buffing.