JPS635518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides appearance and texture similar to natural leather;
In particular, it relates to a leather-like sheet material that has a solid feel and flexibility similar to natural leather.

In the past, many proposals have been made regarding leather-like sheet materials as substitutes for natural leather, but no sheet material that has both flexibility and solid feel similar to natural leather has yet appeared. This is because conventional techniques for constructing leather-like sheets have not been able to produce sheets with a good balance between the flexibility of the base layer and the resilience of the surface coating layer. In other words, it has been proposed for a long time to use special ultrafine fibers to obtain a flexible base layer, but it is difficult to balance the fibers, the resin contained therein, and the surface coating layer, and the flexibility is poor. However, there were drawbacks such as the lack of a solid feel and the appearance of blood-like protrusions on the surface that could not be removed. In order to solve these conventional drawbacks, we have conducted extensive research and have arrived at the present invention.

An object of the present invention is to provide a leather-like sheet material that is extremely flexible, has a solid feel similar to natural leather, and has excellent appearance and color tone.

That is, the leather-like sheet material of the present invention has a nonwoven fabric in which at least 500 fiber bundles made of fine fibers with an average single fiber size of 0.0001 to 0.1 denier are entangled, and a resin mainly composed of an elastic polymer is added to the nonwoven fabric in a fiber-to-resin ratio. At least two surface non-porous layers composed of a resin mainly composed of an elastic polymer are laminated on a base sheet containing a weight ratio of 85:15 to 52:48, and a laminated resin film is formed. The shaped article is stretched by 100% and has a slow recovery behavior with an elastic recovery rate of at least 50% after 1 minute of elongation, and at least one layer of the non-porous surface is colored, and the top layer of the non-porous layer is colored. The surface is a leather-like sheet material finished with a leather-like appearance, and the sheet material has a thickness that is coated with a softener.
Drape coefficient at 0.6mm is in the range of 0.40-0.59 and moisture permeability is at least 700g/m ² /24hrs
This is a leather-like sheet material having the flexibility and solid feel of natural leather.

The fibers constituting the base sheet material of the leather-like sheet material of the present invention are multicomponent fibers made of at least two types of polymers having different physical or chemical properties, which are processed by chemical, physical or mechanical treatment. A special fiber obtained by modification, the special fiber is a fiber composed of fiber bundles of fine fibers with an average single fineness of 0.0001 to 0.1 denier, preferably a multicomponent fiber obtained by extraction treatment with an average single fineness of approximately The fiber is a fiber bundle of at least about 500 fine fibers in the range of 0.0001 to 0.03 denier, and the fineness of the fiber bundle is about 0.5 to 15 denier. The base sheet material of the present invention is obtained by entangling such fiber bundles and making the resulting nonwoven fabric contain a resin mainly composed of an elastic polymer, and the resin content is determined by the ratio of the resin to the fibers. at 15:85-48:52, preferably 20:
The base sheet material has a weight ratio of 80 to 45:55.
If the resin content is outside the range of 15-48,
It is inferior in terms of flexibility and solid feel.

Furthermore, since the surface coating layer of the leather-like sheet product of the present invention has a large effect on the texture, especially the drape coefficient, a resin that does not have rapid resilience or stretch elasticity recovery is used. i.e. 100% elongation,
It consists of at least two non-porous layers composed of a resin mainly composed of an elastic polymer with a slow recovery behavior that has an elastic recovery rate of at least 50% after 1 minute of release, and the surface non-porous layer is small. In both cases, one layer is a colored layer. The total thickness of the surface non-porous layer is approximately 3
~50μ. However, if the thickness cannot be measured, for example, if the thickness of the surface non-porous layer is not uniform depending on the location, a thickness with a resin amount of approximately 3.5 to 60 g/ ^m2 is used, depending on the specific gravity of the resin. be done. The resins or resin compositions forming each non-porous layer have different resin compositions or resin types, and the resins or resin compositions have different dye distribution behavior when dyed under the same conditions. The non-porous layer on the side that contacts the base sheet is preferably made of a resin or a masking material capable of adsorbing at least 50 mg/g of dye, especially from the viewpoint of the depth and clarity of color tone and the balance in crease formation. It is a resin composition containing powerful additives such as pigments.

In order to satisfy the above-mentioned requirements, the leather-like sheet material of the present invention has its tissue structure relaxed within a range that does not impair the structure of the sheet material by kneading and twisting after forming the leather-like sheet material. . In addition, flexibility can be increased by adding a softening agent that does not damage the structure of the sheet, such as polyethylene oxide, polypropylene oxide, ethylene oxide-propylene oxide copolymer, wax, or cationic surfactant. Furthermore, at the same time, these processing agents can give the leather a deep feel similar to that of natural leather.

The fiber bundle made of fine fibers of 0.0001 to 0.1 denier used in the present invention is made from multicomponent fibers made of at least two types of polymers with different physical or chemical properties, and these fibers are entangled to form a nonwoven fabric. After that, the fiber form is modified into a fiber bundle of fine fibers by chemical, physical, or mechanical treatment before or after incorporating the resin. Examples of raw materials for multicomponent fibers include polyamides such as 6-nylon, 66-nylon, and 6,10-nylon, polyesters such as polyethylene terephthalate, polyolefins such as polyethylene, polypropylene, and polybutene, acrylonitrile polymers, Spinnable polymers such as polyvinyl alcohol, polyvinyl chloride, styrene polymers, cellulose derivatives, and regenerated cellulose are used, but when obtaining special fibers by extraction processing, the utilized fiber components, that is, the extraction residual fiber components, are used. needs to be a spinnable polymer, but the extracted fiber component may be a polymer that is independently non-spinnable. These spinnable polymers or spinnable polymers and non-spinnable polymers are spun by combining at least two types of polymers having different physical or chemical properties. In this case, the fiber morphology is observed as a so-called sea-island fiber in which at least one type of polymer is dispersed as a micro cross section and at least one other type of polymer is dispersed as a dispersion medium component in the cross section of the fiber, or At least one type of polymer must be a so-called conjugated fiber, which is observed with other polymers arranged regularly or irregularly with respect to each other. However, adhesive fibers obtained by spinning fine fibers and binding them with a glue can also be used as a raw material for obtaining the leather-like sheet material of the present invention. Such multicomponent fibers are subjected to treatments such as stretching, crimping, and cutting as necessary. The multicomponent fibers are then made into a fiber laminate, made into a fiber-entangled nonwoven fabric by methods such as needle punching or fluid jetting, and the multicomponent fibers are processed by chemical, physical or Mechanically treated to produce modified special fibers. That is, in the case of sea-island fibers, the dispersion medium component (or sea component) is treated with a solvent to dissolve and remove it, and the dispersion component (or island component) is made into independent fine fibers, thereby obtaining a fiber bundle made of fine fibers. In the case of bonded fibers, either of the components may be treated with a solvent, or each component may be separated by heat or mechanical action. When separating each component, the action of a poor solvent or swelling agent for either component may be utilized. Then, a fiber bundle in which the average fineness of fine fibers is 0.0001 to 0.1 denier is obtained. Furthermore, in the case of the above-mentioned adhesive fibers, the sizing agent is removed to obtain fiber bundles. The fiber bundle thus obtained is preferably one in which the fine fibers constituting it have a small fineness. In other words, if the fineness is large and the fiber bundles are thick, blood streaks will appear on the surface of the product, which will impair its appearance and increase its stiffness, resulting in a product that does not have the solid feel of natural leather. becomes. From this point of view, preferred special fibers are fiber bundles of at least about 500 fine fibers with an average single fineness in the range of 0.0001 to 0.03 deniers, and fibers with a fineness of about 0.5 to 15 deniers as a fiber bundle. . It is industrially advantageous to make such special fibers from sea-island fibers.

In addition, for resins mainly composed of elastic polymers contained in entangled nonwoven fabrics, the recovery rate after 1 minute when stretched 100% is at least 50%, or the rebound recovery after 1 minute when folded in half. Resins having a degree of at least 90 degrees are preferred. This elastic recovery behavior is achieved not only by the inherent elasticity of the resin, but also by resins that exhibit elastic behavior due to the formation structure such as resin sponging, which exhibits elastic behavior due to plasticization, or even resins whose elastic behavior increases. be done. Such resins include, for example, synthetic rubbers such as polyurethane, polyurethaneurea, polyurea, acrylic acid ester polymers or copolymers, acrylonitrile-butadiene copolymers, styrene-butadiene copolymers, polyisoprene, polybutadiene, natural rubbers, Examples include vinyl chloride polymers or copolymers, polyesters, and the like. In particular, when producing flexible and firm sheets, polymers consisting of an elastic component (soft segment) and inelastic component (hard segment) are easy to adjust, such as adjusting flexibility and resilience, and adjusting the state of the sponge structure. This is preferable in this respect. Such polymers include polyurethane elastomers, polyurethane urea elastomers, and polyester elastomers. These polymers may be used by selecting one or more polymers having appropriate stiffness depending on the desired feel performance of the leather-like sheet material.

The means for incorporating the resin into the entangled nonwoven fabric include a resin solution, a dispersion such as an emulsion or paste, or a liquid in which another type of resin is finely dispersed in a solution of at least one type of resin. So-called wet coagulation, which involves impregnating a non-woven fabric with resin, and then treating it with a non-solvent resin (including solvent-non-solvent systems), electrolyte solution, etc., so-called dry coagulation, which involves treating it with dry heat or a non-solvent vapor atmosphere, or a combination of both. By solidifying, the resin is made to exist within the entangled nonwoven fabric in a porous or non-porous manner. Furthermore, in order to avoid excessive rebound in texture and to reduce bending stiffness to give a solid feel similar to natural leather, the ratio of fiber to resin should be 85:15 to 52:48, preferably 80:20 to 55. The amount of resin impregnated is selected to be suitable for the desired leather-like sheet material. For example, it is determined as appropriate based on the bending stiffness of the special fiber, the density of the entangled nonwoven fabric, the stiffness of the resin, processability, etc.

Next, the resin mainly composed of an elastic polymer constituting the surface coating layer of the leather-like sheet article of the present invention is composed of at least two layers, and the layer on the side in contact with the base sheet article is composed of at least two layers. The resin constituting the resin has an elongation of 100% or more, and the recovery rate at 100% elongation is at least 50%, or the rebound recovery rate after 1 minute when folded in two is at least 90 degrees. Resins with good recovery behavior are preferred. This elastic recovery behavior is not limited to the inherent elasticity of the resin, but may also be the elastic behavior exhibited by plasticization. Examples of resins that exhibit such elastic recovery behavior include polyurethane, polyurethaneurea, polyurea, vinyl chloride polymer or copolymer, polyester, polyamide, and synthetic rubber. Polymers consisting of an elastic component (soft segment) and an inelastic component (hard segment) are preferred from the viewpoint of easy adjustment of elasticity or elasticity. Such polymers include non-crosslinked polymers that are polymerized or polymerized from a polymeric diol, an organic diisocyanate or an organic triisocyanate, and a chain extender having at least two active hydrogen atoms, such as a diol, triol, diamine or triamine. Alternatively, a crosslinked polyurethane elastomer or polyurethane urea elastomer, or a polyester elastic resin comprising a polymer diol, a diol having an aromatic ring such as bisphenol A, and a chain extender may be mentioned. These elastic resins may contain other elastic polymers, such as acrylic ester polymers or copolymers, acrylonitrile-butadiene copolymers, or non-elastic polymers, such as modified polyamides, cellulose derivatives, methacrylic resins, and other common materials. Addition within a range that does not impair elasticity (satisfying the above conditions) also brings about favorable results in terms of abrasion resistance, dyeability, creases, mold fixation, etc.

Furthermore, the surface coating layer of the present invention does not necessarily need to be entirely composed of an elastic resin; for example, if necessary, the outermost layer or a layer near the outermost surface may be made of a resin that does not satisfy the above elasticity conditions. Applying it as a continuous film or applying it as a thin film also brings about favorable results in terms of mold fixing properties, crease resistance, and the like.

On the other hand, it is important that the bottom layer or the layer near the bottom that is in contact with the base sheet is made of a resin or resin composition that has a dye adsorption capacity of at least 50 mg/g, which will reduce the depth of color and irritation of the product. It is preferable for the following reasons. Furthermore, adding an inorganic or organic additive with a hiding power, such as a pigment, to this layer is also effective in hiding blood lines.

The surface coating layer of the leather-like sheet product of the present invention is composed of at least two non-porous layers, preferably at least three non-porous layers in total, and has a total thickness of 3 to 50 μm. From the viewpoint of surface performance, flexibility, drapability, and color tone, it is preferable to keep the

Methods for applying such a non-porous layer to a base material sheet include, for example, applying resin to a release material in order from the surface layer, forming a film and transferring it, or creating a resin layer one by one and transferring it. Alternatively, a dispersion such as a resin solution, resin paste, or emulsion may be applied directly to the surface of the base material sheet by a roll coating method, a knife coating method, or a spray method, in which a dispersion such as a resin solution, resin paste, or emulsion is applied using a roll such as a score roll or a smooth roll. Apply sequentially to form a non-porous layer. It should be noted that the surface of the base material sheet to which the non-porous layer is to be applied should be smoothed or embossed in advance by pressing it against a heating plate to smooth it, so that a clean surface coating layer can be applied and the blood lines can be formed. It is effective in suppressing the occurrence.

The leather-like sheet material produced by the above method is finished by stamping the surface, dyeing, and subjecting it to a softening treatment. In this case, it is preferable to include a softening agent that does not impair the structure of the sheet material, since this increases the flexibility and gives a solid feel similar to natural leather.

As mentioned above, the present invention mainly consists of a base sheet material and a surface non-porous layer, and in this case,
By selecting various conditions appropriately, the thickness of the sheet material was 0.6 mm.
By having a drape coefficient of 0.40 to 0.59 and a moisture permeability of at least 700g/m ² /24hrs, the leather-like material has the solid feel and flexibility of natural leather, which is the object of the present invention. A sheet product is obtained. Furthermore, what is drape coefficient?
According to the method of JISL1096, moisture permeability is JIS
This is a value measured by the method of K6549.

Such a leather-like sheet material is suitable for clothing, interior decoration, boots, etc.

Embodiments of the present invention will be described below with reference to Examples, but the present invention is not limited to these Examples. Note that parts and percentages in the examples refer to weight.

Example 1 50 parts of 6-nylon and 50 parts of polyethylene were spun, and the fiber cross section of the 6-nylon was made into a multicomponent fiber with about 800 finely dispersed components using polyethylene as a dispersion medium component, which was then drawn and wound. Shrink and cut to make staples with a fineness of 4.3 dr, make a web with a cross wrapper, and needle punch to make a staple with a fabric weight of 750 g/
^m2 entangled nonwoven fabric was obtained. The entangled nonwoven fabric was then heat-set, rolled and surface-smoothed to form a 12% polyurethane consisting of 80 parts of polyester polyurethane and 20 parts of polyethylene ether polyurethane.
A dimethylformamide solution (hereinafter referred to as
It was solidified by immersing it in a 30% aqueous solution (DMF).
The obtained sheet material is extracted with a solvent to extract the polyethylene component of the fiber, washed, and dried to convert the multicomponent fiber into a 6-
A base sheet material having a thickness of approximately 1.5 mm was obtained from a fiber-entangled nonwoven fabric modified into special fibers of nylon fine fiber bundles.

Next, the above-mentioned base sheet material was sliced at approximately the center of the thickness to obtain two sheets of approximately 0.8 mm, and the sliced surfaces were puffed with sandpaper to obtain a sheet material of approximately 0.65 mm in thickness. Ta. On the other hand, the surface during solidification was pressed onto a smooth stainless steel surface heated to 125°C to form a smooth base sheet, and a cross-linked polyether polyurethane (dyeing amount 240 mg/g with respect to metal complex dye) was applied to that surface. An aqueous dispersion with a solid content of approximately 16 g/m ² was applied using a roll coater method using a scored roll, dried to provide a first non-porous layer, and then a yellow-brown pigment was added. A 14% solution of non-crosslinked polyester polyurethane was prepared and applied with a score roll at an amount of approximately 5 g/m ² solids to provide a second non-porous layer, forming a non-crosslinked polyethylene ether polyurethane. A solution of (149 mg/g dyeing amount for metal complex dye) is applied in a solid amount of about 2 g/ ^m2 , dried to form a third non-porous layer, and then embossed to create a leather pattern. After applying a polyurethane solution with a smaller dyeing amount than the lower layer on the surface to adjust the gloss, it is dyed brown with a metal complex dye composition, treated with a finishing agent, softened by rolling, and rubbed. A leather-like sheet material was obtained that was soft and had a solid feeling similar to natural leather. This leather-like sheet material has a thickness of 0.60 mm, a basis weight of 237 g/m ² , an apparent density of 0.395 g/cm ³ , and a moisture permeability of 1140
g/m ² /24hrs, and its drapability is 0.51
It had a deep color and no visible fiber veins on its surface, making it a suitable material for clothing.
The surface non-porous layer was laminated from the first layer to the outermost gloss-adjusting polyurethane layer on another polyethylene sheet to obtain a film with a thickness of about 21 μm.
The cut elongation of a film similarly dyed and softened was 275%, 100% elongation, and the elastic recovery rate after 30 seconds and 1 minute of release was 66% and 83%, showing slow recovery. behavior.

Example 2 55 parts of polyethylene terephthalate with a solution viscosity [η] = 0.74 and 45 parts of polyethylene were split and spun, and the fiber cross section of the polyethylene terephthalate became a finely dispersed component of about 670 with polyethylene as the dispersion medium component. Create multicomponent fibers, draw them,
Crimped and cut into staples with a fineness of 5.1 dr,
A web was made using a random webber and needle punched to obtain an entangled nonwoven fabric with a basis weight of approximately 745 g/m ² . Next, the entangled nonwoven fabric was impregnated with a 5% aqueous solution of polyvinyl alcohol, dried and heat-set in a heating zone at 135°C, and further smoothed. A polyurethane composition of 70 parts of polycaprolactone polyurethane and 30 parts of polyacrylic acid ester was added to this entangled nonwoven fabric.
% dimethylformamide solution, coagulate in a 40% dimethylformamide aqueous solution, further extract the polyethylene component of the fiber with hot perchlorethylene, wash to remove polyvinyl alcohol, etc., and dry to obtain a polyethylene terephthalate fine fiber bundle. The thickness of the fiber-entangled nonwoven fabric modified into special fibers is approx.
A 1.6 mm base sheet was obtained.

Next, the surface of the base sheet was smoothed by contacting with the surface of the heating plate, and 50 parts of an easily dyeable polyurethane (dyeing amount: 166 mg/g) dispersion and self-crosslinking polyacrylic ester were dispersed on the smooth surface. 50 parts of the liquid were mixed, and a solids amount of approximately 25 g/m ² was roll coated using a scored roll and dried to form a non-porous layer. Next, a polyether-based polyurethane solution with a solid content of 4 g/m ² was roll-coated with a score roll, dried and embossed, and further,
Approx. solid content of resin solution mainly composed of polyurethane
The gloss was adjusted by coating in an amount of 1.5 g/m ² and dyed with a disperse dye to obtain a brown leather-like sheet. This sheet material is softened and finished to a thickness of 1.55 mm.
Area weight 620g/m ² , apparent density 0.400g/cm ³ , moisture permeability
The weight of this sheet was 1205 g/m ² /24 hrs, and the drape property measured by slicing the surface layer side to 0.6 mm was 0.54, and it had the flexibility and solid feel of natural leather.

This material was suitable for making things such as gloves and soft boots.

Comparative Example Using the resin composition of Example 2, 45 multicomponent fibers having a fineness of 15 dr and a polyethylene terephthalate dispersed component were prepared, and a leather-like sheet material was obtained in the same manner as in Example 2. This product does not have the solid feel of natural leather, and is thick.
The drapability at 0.6 mm was 0.62, and fiber bundles appeared as blood lines on the surface, which was unfavorable in appearance.

Example 3 A mixed fiber was made from 50 parts of 6-nylon and 50 parts of polyethylene. This mixed fiber has a form in which 6-nylon exists as a component of about 1250 microfibers in the cross section of the fiber. This mixed fiber is stretched to improve its fineness.
A web was made from the staples obtained by crimping and cutting the fibers of 4.1 dr, which were then needle-punched to form a nonwoven fabric with a fabric weight of 810 g/m ² . Then, 85 parts of polyester polyurethane and polyether polyurethane were added to the processed nonwoven fabric obtained by impregnating it with a 5% aqueous solution of polyvinyl alcohol, drying it, and heat-setting it.
15 parts were dissolved in dimethylformamide to make a 12% polyurethane solution, impregnated with a composition solution containing a coagulation regulator, coagulated in a 20% dimethylformamide aqueous solution, and the polyethylene component in the fiber was extracted and removed. A sheet material was made by modifying special fibers in the form of nylon fine fiber bundles.

Next, the above-mentioned sheet material was sliced at approximately the center of the thickness to obtain two sheet materials, and then the sliced surfaces were puffed with sandpaper to obtain a sheet material with a thickness of 0.65 mm and to form a fluffy surface. . On the other hand, the surface of the solidified surface was smoothed by pressing it against a mirror surface of a stainless steel belt heated to 130°C to obtain a base material sheet () with a smooth surface. Easy-to-dye cross-linked polyether polyurethane (dyeing amount 215%) on its smooth surface
A dispersion with a concentration of 40% (g/g) was coated with a scoring roll in an amount of 20 g/m ² as a solid content, dried, and the first
A non-porous layer is created, and then a solution of polyether polyurethane (dyeing amount 139 mg/g) is coated with a scoring roll in an amount of 6 g/m ² as solid content to create a second non-porous layer. After printing, heat embossing and molding are performed.
Next, a third non-porous layer was formed by coating a gloss adjusting resin composition liquid in an amount of about 1.4 g/m ² as a solid content using a scoring roll, and the total non-porous layer had a thickness of about 26 μm. I made it. This sheet material was dyed with a metal complex dye and subjected to a softening agent treatment and a softening treatment to obtain a leather-like sheet material that had the flexibility and solid feel of natural leather.
This sheet material had a deep color and showed no blood lines, which was excellent. Thickness 0.6mm, apparent density 0.42
g/cm ³ , moisture permeability of 1142 g/m ² /24 hrs, and drapeability of 0.50. In addition, a laminated film with a thickness of approximately 26 μm with a surface non-porous layer prepared separately was dyed in the same manner.
Cutting elongation of film measured after softening treatment is
215% and 100% elongation, and the elastic recovery rates 30 seconds and 1 minute after release were 49% and 72%, showing slow recovery behavior.

Example 4 On the smooth surface of the base sheet material obtained in Example 3, a methanol-aqueous solution of modified polyamide was mixed with a polyurethane dispersion at a solid content of about 15 g/1:1. m ² and dried to form a first non-porous layer, then a pigmented polyether polyurethane solution was applied in an amount of about 5 g/m ² solids and dried to form a second non-porous layer. A non-porous layer is formed, and the solid content of the polyether polyurethane solution is about 3
g/m ² and dried to form a third non-porous layer, which was then heated and embossed to give a leather pattern. A polyurethane solution containing methacrylic resin is then applied to give a total non-porous layer thickness of approx.
I made a 23μ one. The sheet material was dyed, treated with a softener and finished with mechanical softening.

The resulting sheet material has a deep color and a thickness of 0.6
Drapability in mm is 0.48, moisture permeability 1310g/
m ² /24 hrs, had no blood lines or unevenness at folded parts, had a solid feel and flexibility similar to natural leather, and was an excellent leather-like sheet material as a material for clothing.

Claims (1)

[Claims] 1. A nonwoven fabric in which at least 500 fiber bundles of fine fibers with an average single fineness of 0.001 to 0.1 denier are entangled, and a resin mainly composed of an elastic polymer is added to the nonwoven fabric in a fiber-to-resin weight ratio. 85:15~52:48 Mainly composed of an elastic polymer having a slow recovery characteristic of at least 50% elastic recovery after 100% elongation and at least 50% of elastic recovery after 1 minute of release from elongation. A leather-like sheet material provided with at least two non-porous layers composed of resin, at least one of the non-porous layers being colored and having a surface finished with a leather-like appearance, the leather-like sheet material Items are softened and thickened
A leather-like sheet having natural leather-like flexibility and a solid feel, characterized by having a drape coefficient in the range of 0.40 to 0.59 at 0.6 mm and a moisture permeability of at least 700 g/m ² /24 hrs. thing. 2. A resin or resin composition in which the total thickness of the surface non-porous layer is 3 to 50μ, and the dye distribution behavior differs when the resin or resin composition forming each non-porous layer is dyed under the same conditions. The leather-like sheet material according to claim 1, wherein the surface non-porous layer is formed by: 3. A patent claim in which the surface non-porous layer is composed of a resin composition in which the non-porous layer on the side in contact with the base sheet has a dye adsorption capacity of at least 50 mg/g or an additive with hiding power is added. The leather-like sheet material according to item 1 or 2. 4. The leather-like sheet material according to any one of claims 1 to 3, wherein the elastic polymer resin constituting the surface non-porous layer is a resin mainly composed of non-crosslinked or crosslinked polyurethane.