KR20210087359A - Artificial leaher - Google Patents

Abstract

The present application relates to artificial leather and an automobile seat comprising the artificial leather. According to the present application, a matting effect can be exhibited even without the use of a matting agent, and excellent abrasion resistance, stain resistance and soft feel are possible.

Description

Artificial leather {ARTIFICIAL LEAHER}

The present application relates to artificial leather and an automobile seat comprising the artificial leather.

In general, a functional seat for a comfortable and pleasant driving is in the spotlight as a car seat. As a material for automobile seats, natural leather, PVC, and PU artificial leather are mainly used. Artificial leather has the advantage of being cheaper than natural leather.

In order to implement a matting effect on the surface of such artificial leather, a lot of matting agent is used. As such a matting agent, silica particles were mainly used, and after mixing them with a coating solution, coating on a substrate and curing, it has a mechanism of matting by making irregularities on the surface. However, when a matting agent is used, although the gloss is effectively reduced, the viscosity of the coating solution increases, the dispersibility of the silica particles decreases, and also the abrasion resistance of the coating layer rapidly decreases.

Therefore, in order to solve this problem, an artificial leather that exhibits a matting effect without the use of a matting agent and has excellent abrasion resistance, stain resistance and soft feel is required.

An object of the present application is to provide an artificial leather which exhibits a matting effect without the use of a matting agent, excellent abrasion resistance, stain resistance and soft feel, and a seat for automobiles comprising the artificial leather.

This application relates to artificial leather. 1 is a view exemplarily showing artificial leather according to an embodiment of the present application. As shown in FIG. 1 , the artificial leather includes a base layer 120 and a surface treatment layer 110 in which a composition for surface treatment is cured on the base layer. The artificial leather of the present application includes a surface treatment layer in which the composition for surface treatment is cured, and thus exhibits a matting effect, and may have excellent abrasion resistance, stain resistance and soft feel.

In one embodiment, the surface treatment layer may be cured using a thermal curing process through the application of appropriate heat or an aging process. Specifically, the surface treatment layer may be formed by performing thermal curing for 30 seconds to 5 minutes at a temperature of 100 ℃ to 140 ℃ after coating on the base layer by a Mayer bar (Mayer bar) coating method. More specifically, the surface treatment layer may be formed by performing thermal curing at a temperature of 110° C. to 130° C. for 1 minute to 3 minutes after coating on the base layer by the above-described coating method. By including the surface treatment layer on the base layer, a matte effect may be exhibited, and abrasion resistance, stain resistance and soft feel may be excellent.

The surface treatment layer has a squeak index of 0.05 or less measured under a squeak test. Specifically, the squeak index of the surface treatment layer measured under the above-described test may be 0.03 or less or 0.01 or less. In addition, the lower limit of the squeak index of the surface treatment layer may be 0.001 or more or 0.005 or more. In addition, the squeak index means that a continuous sound having a high frequency generated during the evaluation method to be described later is expressed as an index. When the squeak index of the surface-treated layer measured under the test satisfies the above-described range, the surface-treated layer may exhibit an excellent soft feel, that is, a soft feel.

In another example, the surface treatment layer may have a coefficient of kinetic friction measured under a squeak test of 0.3 or less. Specifically, the coefficient of kinetic friction of the surface treatment layer measured under the above-described test may be 0.2 or less. In addition, the lower limit of the coefficient of kinetic friction of the surface treatment layer measured under the above test may be 0.01 or more, 0.05 or more, or 0.1 or more. The coefficient of dynamic friction means a ratio of a force (dynamic friction force) that tries to prevent an object from moving in contact with the surface of another object to a reaction force perpendicular to the surface. When the coefficient of kinetic friction of the surface-treated layer measured under the test satisfies the aforementioned range, the surface-treated layer may exhibit excellent soft feel, that is, a soft feel.

In another example, the surface treatment layer may have a gloss, specifically, a glossiness of 4 or less measured under a 60° condition with a BYK (Micro-TRI-gloss) gloss meter. Specifically, the glossiness of the surface treatment layer measured under the above-described conditions may be 3.5 or less, 3 or less, 2.5 or less, 2 or less, or 1.5 or less. The lower limit of the glossiness of the surface treatment layer measured under the above conditions is not particularly limited as long as it is close to 0. When the glossiness of the surface treatment layer measured under the above-described conditions satisfies the above-described range, a matte effect may be exhibited.

In another example, the surface treatment layer may have an adhesive force measured under a tape-crosscut test of greater than 4B. In addition, the upper limit of the adhesion force of the surface treatment layer measured under the above-described test may be 5B or less. When the adhesive force of the surface treatment layer measured under the above-described test satisfies the aforementioned range, excellent adhesion may be exhibited.

In another example, the surface treatment layer may have a wear resistance of 4 or higher as measured under a Taber abrasion test. In addition, the upper limit of the abrasion resistance of the surface treatment layer measured under the above-described test may be 5 or less. The surface treatment layer measured under the above-described test may exhibit excellent wear resistance in the above-described range.

The composition for surface treatment included in the surface treatment layer includes a first water dispersion type polyurethane resin and a second water dispersion type polyurethane resin. As used herein, the term “water-dispersible polyurethane resin” refers to a material in which a polyurethane resin that is not soluble in water is dispersed in water in a particulate state.

The first water-dispersible polyurethane resin may have an average particle diameter of 1 μm to 10 μm. Specifically, the average particle diameter of the first water-dispersible polyurethane resin may be 1.5 μm to 8.5 μm, 2 μm to 7 μm, or 2.5 μm to 5.5 μm. When the average particle diameter of the first water-dispersible polyurethane resin satisfies the above-mentioned range, a height difference is generated due to the difference in particle diameter with the second water-dispersible polyurethane resin, and a concave-convex structure can be formed on the surface during curing, which results in It exhibits a matte effect, and may have excellent abrasion resistance, stain resistance and soft feel.

As the second water-dispersible polyurethane resin, a particle diameter smaller than that of the first water-dispersible polyurethane resin may be used. For example, the second water-dispersible polyurethane resin may have an average particle diameter of 1 nm to less than 1000 nm. Specifically, the average particle diameter of the second water-dispersible polyurethane resin is 10 nm to 850 nm, 20 nm to 700 nm, 30 nm to 550 nm, 40 nm to 400 nm, 50 nm to 250 nm, or 60 nm to 100 nm can be When the average particle diameter of the second water-dispersible polyurethane resin satisfies the above-described range, a difference in height is generated due to the difference in particle size with the first water-dispersible polyurethane resin, thereby forming a concave-convex structure on the surface during curing. It exhibits a matte effect, and may have excellent abrasion resistance, stain resistance and soft feel.

In one example, the average particle diameter difference (βd) of the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin is 0.1 μm to less than 14 μm, 0.5 μm to 12 μm, 1 μm to 10 μm, 1.5 μm to 8 μm or 2 μm to 6 μm. When the average particle diameter difference between the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin satisfies the above-mentioned range, a height difference is generated and a concave-convex structure can be formed on the surface during curing, thereby exhibiting a matting effect, It can have good abrasion resistance, stain resistance and soft feel.

For this reason, the composition for surface treatment of the present application may not include a matting agent. The composition for surface treatment includes the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin each satisfying the above-mentioned particle size, thereby exhibiting a matting effect without the use of a matting agent, and has excellent wear resistance, stain resistance and soft feel. can be excellent

In one example, the surface treatment layer may have a concave-convex structure by the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin. As used herein, the term “concave-convex structure” refers to a structure in which the convex portion 111 and the concave portion 112 are repeated to have a predetermined pattern. For example, the uneven structure may be formed due to a height difference between the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin. Due to this, the surface treatment layer may exhibit a matting effect by increasing the surface roughness, thereby exhibiting an excellent matting effect, and may have excellent abrasion resistance, stain resistance and soft feel.

For example, the concave-convex structure may have a convex portion in a region in which the first water-dispersible polyurethane resin exists, and a concave portion in a region in which the second water-dispersion polyurethane resin exists.

In one example, the average height (h ₁₁₂₎ at an average concave-convex structure, the convex portion the height (h ₁₁₁₎ and the concave portion of the difference between the surface treatment layer may be less than 0.5 ㎛ to 2 ㎛. Specifically, the average height difference may be 0.7 μm to 1.8 μm, 0.9 μm to 1.6 μm, 1.1 μm to 1.4 μm, or 1.2 μm to 1.3 μm. When the average height difference between the convex portion and the concave portion of the concave-convex structure of the surface treatment layer satisfies the above-described range, a matting effect may be exhibited, thereby exhibiting an excellent matte effect, abrasion resistance, stain resistance, and soft feel.

In one example, the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin may be reactants formed by reacting an isocyanate compound, a polyol, a neutralizing agent, an organic acid, water, and a chain extender. Specifically, the reactant of each of the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin is synthesized by reacting the isocyanate compound, polyol, and organic acid together to synthesize a prepolymer, followed by adding a neutralizing agent, water and a chain extender. can be created

The isocyanate compound is for polyurethane synthesis. For example, an aromatic isocyanate and/or an aliphatic isocyanate may be used as the isocyanate compound.

Specifically, the aromatic isocyanate may be at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, phenylene diisocyanate, torylene diisocyanate, and derivatives thereof, but is not limited thereto.

In addition, the aliphatic isocyanate may be at least one selected from the group consisting of isophorone diisocyanate, cyclohexane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and derivatives thereof, but is not limited thereto.

The polyol is for synthesizing polyurethane, and is a liquid polymer material having two or more hydroxyl (-OH) groups attached to a hydrocarbon chain. As the polyol, at least one compound selected from the group consisting of a polyester polyol, a lactone polyol, a polycarbonate polyol, and a polyether polyol may be used, but is not limited thereto.

The neutralizing agent is to make the polyurethane ionic to enable water dispersion. The neutralizing agent includes ethylamine, butylamine, dimethylamine, diisopropylamine, dimethylethylamine, benzylamine, ethanolamine, diethanolamine, triethanolamine, trimethylamine, triethylamine, tributylamine, diethylethanolamine One or more compounds selected from the group consisting of , dimethylethanolamine and diisopropanolamine may be used, but the present invention is not limited thereto.

The organic acid is for introducing an ion group into the chain to enable water dispersion of the polyurethane. As the organic acid, one or more compounds selected from the group consisting of dimethylol propionic acid and dimethylol butanioxane may be used, but the present invention is not limited thereto.

The chain extender is for increasing the molecular weight of the polyurethane. The chain extender includes dimethyl hydrazine, 1,6-hexamethylene bishydrazine, hydrazine monohydrite, ethylene diamine, 1,3-propanediamine, 1,4-butanediamine, 1,6-hexamethylene diamine, diaminophenyl One or more compounds selected from the group consisting of methane and isophorone diamine may be used, but are not limited thereto.

In another example, the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin may control the desired average particle diameter by adjusting the weight average molecular weight, but is not limited thereto.

For example, the first water-dispersible polyurethane resin may have a weight average molecular weight of 5000 to 20000, 7000 to 19000, 9000 to 18000, 11000 to 17000, or 13000 to 16000. The first water-dispersible polyurethane resin may satisfy the above-mentioned average particle diameter in the micrometer range by satisfying the above-described weight average molecular weight.

In addition, the second water dispersion type polyurethane resin may have a weight average molecular weight of 30000 to 50000, 32000 to 48000, 34000 to 46000, 36000 to 44000, or 38000 to 42000. The second water dispersion type polyurethane resin may satisfy the above-mentioned average particle diameter in the nanometer range by satisfying the above-described weight average molecular weight.

The first water-dispersible polyurethane resin may be included in the composition for surface treatment in an amount of 300 to 500 parts by weight based on 100 parts by weight of the second water-dispersible polyurethane resin. Specifically, the content of the first water-dispersible polyurethane resin relative to 100 parts by weight of the second water-dispersible polyurethane resin is 320 parts by weight to 470 parts by weight, 340 parts by weight to 440 parts by weight, 360 parts by weight to 410 parts by weight or It may be 380 parts by weight to 390 parts by weight. Since the first water-dispersible polyurethane resin has a content in the above-described range compared to 100 parts by weight of the second water-dispersible polyurethane resin, it exhibits a matting effect without the use of a matting agent, and has excellent abrasion resistance, stain resistance and soft feel. have.

The composition for surface treatment may further include an additive. Specifically, the composition for surface treatment may further include one or more additives selected from the group consisting of a thickener, an antifoaming agent, a wetting agent, and a curing agent. More specifically, the composition for surface treatment may be of a two-component type.

As the type of each of the additives, any type known in the art may be used. In addition, the content of each of the additives may be appropriately selected in consideration of the purpose and use of the present application.

For example, as the curing agent, a compound including at least one functional group selected from the group consisting of an aziridine group, an isocyanate group, and a carbodiimide group per molecule may be used.

Specifically, the compound having an aziridine group refers to a compound including a hetero three-membered ring composed of 2 carbon atoms and 1 nitrogen atom, and 3-(3-methoxyphenyl)-3-(trifluoromethyl)-dia ziridine (3-(3-methoxyphenyl)-3-trifluoromethyl)-diaziridine); 3-(trifluoromethyl)-3-phenyldiaziridine (3-(trifluoromethyl)-3-phenyldiaziridine); propane-2,2-diyldibenzene-4,1-diyldiaziridine-1-carboxylate; propane-2,2-diyldibenzene-4,1-diyl diaziridine-1-carboxylate; 1,1'-(butylphosphoryl)diaziridine (1,1'-(butylphosphoryl)diaziridine); oxydiethane-2,1-diyldiaziridine-1-carboxylate; 3,3-bis(1,1-difluorohexyl)-[1,2]diaziridine (3,3-bis(1,1-difluoro-hexyl)-[1,2]diaziridine); 1-aziridine propanoic acid (1-Aziridinepropanoicacid); 2-methyl-2-[[3-(2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propaneylester (2-methyl-2-[[3- (2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propanediylester); 2-ethyl-2-[[3-(2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propaneylester (2-ethyl-2-[[3- (2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propanediylester); 2-ethyl-2-[[3-(2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propanediylbis(2-methyl-1-aziridinepropano ate) (2-ethyl-2-[[3-(2-methyl-1-aziridinyl)-1-oxopropoxy]methyl]-1,3-propanediylbis(2-methyl-1-aziridinepropanoate)); Pentaerythritol tris[3-(1-aziridinyl)propionate]), pentaerythritol tris(3-aziridinopropionate) (pentaerythritol tris( 3-aziridinopropionate)) and combinations thereof.

The compound having an isocyanate group is, for example, toluene diisocyanate, diphenylmethane diisocyanate, modified diphenylmethane diisocyanate, naphthalene diisocyanate, phenylene diisocyanate, hexamethylene diisocyanate, lysine isocyanate, cyclohexane diisocyanate, 3 -Isocyanetomethyl-3,5,5-trimethylcyclohexyl isocyanate, isophorone diisocyanate, methylenediphenyl isocyanate, xylene diisocyanate, tetramethylxylene diisocyanate, norbornene diisocyanate, triphenylmethane triisocyanate, poly It may include at least one selected from the group consisting of phenyl polymethylene polyisocyanate, polyisocyanate containing carbodiimide group, polyisocyanate containing allophanate group, polyisocyanate containing isocyanurate group, and combinations thereof. .

The compound having a carbodiimide group may be polycarbodiimide.

In addition, the curing agent may be included in the composition for surface treatment in an appropriate amount to perform a curing reaction. For example, the curing agent is 5 parts by weight to 15 parts by weight, specifically, 6 parts by weight to 14 parts by weight, 7 parts by weight to 13 parts by weight, or 8 parts by weight to 11 parts by weight based on 100 parts by weight of the composition for surface treatment. It may be included in the composition for surface treatment.

As the base layer, a known base layer used in the artificial leather industry may be used, and for example, may be a fiber layer including natural or synthetic leather. The synthetic leather may be synthetic leather including polyvinyl chloride (PVC), polyurethane (PU), and polyester. After heat curing, the thickness of the surface treatment layer may be 4 μm to 24 μm. Specifically, after thermal curing, the thickness of the surface treatment layer may be 5 μm to 21 μm, 6 μm to 18 μm, 7 μm to 15 μm, or 8 μm to 12 μm. In the present specification, the thickness of the surface treatment layer may mean the maximum thickness of the surface treatment layer in which the convex portion and the concave portion are formed. When the surface treatment layer formed on the base layer has a thickness in the above-described range, a matte effect may be exhibited, and abrasion resistance, stain resistance and soft feel may be excellent.

The present application also relates to a seat for an automobile. The automobile seat includes the artificial leather described above, and the details of the artificial leather may be identically applied to those described in the artificial leather.

The automobile seat includes the artificial leather. By including the artificial leather in the automobile seat, a matte effect may be exhibited, and abrasion resistance, stain resistance and soft feel may be excellent.

The artificial leather of the present application and the automobile seat including the artificial leather may exhibit a matting effect without the use of a matting agent, and may have excellent abrasion resistance, stain resistance and soft feel.

1 is a view exemplarily showing artificial leather according to an embodiment of the present application.
2 is a photograph of artificial leather according to an embodiment of the present application.
3 is a photograph taken at a magnification of 1000 using a scanning electron microscope of the artificial leather prepared in Example.
4 to 6 are photographs of artificial leather according to Comparative Example 1, Comparative Example 2, and Comparative Example 3 of the present application, respectively.

Hereinafter, the present application will be described in detail through Examples, but the scope of the present application is not limited by the Examples below.

Example

Preparation of composition for surface treatment

Based on 100 parts by weight of the total weight, 70 parts by weight of the first water-dispersible polyurethane resin having an average particle diameter of 4 μm (PUR MATT series, Alberdink boley), and the second water-dispersing polyurethane resin having an average particle diameter of 70 nm (DLC series, Covestro ) 18 parts by weight of a thickener (viscoplus 3030, TEGO) 0.5 parts by weight, an antifoaming agent (024, BYK) 0.5 parts by weight, a wetting agent (surfonyl 104, EVONIK) 1 part by weight and a curing agent (desmodur N3900, COVESTRO) 10 parts by weight are mixed at room temperature to prepare a composition for surface treatment in the form of a mixture.

manufacture of artificial leather

The surface treatment composition prepared above is applied to a fiber layer made of a polyvinyl chloride resin material, which is a base layer, and after thermal curing at 120° C. for 2 minutes and drying, the average height difference between the convex and concave parts on the base layer is An artificial leather having a surface treatment layer having a thickness of 1.2 μm was prepared. The artificial leather prepared in Example was photographed and shown in FIG. 2 .

In addition, Figure 3 is a photograph taken at a magnification of 1000 using a scanning electron microscope of the artificial leather prepared in Example. As shown in FIG. 3 , it was confirmed that the intervals of irregularities formed on the surface of the artificial leather prepared in Example were not uniform and irregular.

Comparative Example 1

Preparation of composition for surface treatment and artificial leather

The composition and artificial for surface treatment in the same manner as in Example 1, except that the silica matting agent (Acematt 3300, EVONIK) was used in an amount of 8 parts by weight based on 100 parts by weight of the second water-dispersible polyurethane resin instead of the first water-dispersible polyurethane resin. leather was made. The artificial leather prepared in Comparative Example 1 was photographed and shown in FIG. 4 .

Comparative Example 2

Preparation of composition for surface treatment and artificial leather

A composition for surface treatment and artificial leather were prepared in the same manner as in Example 1, except that the second water-dispersible polyurethane resin was not used. The artificial leather prepared in Comparative Example 2 was photographed and shown in FIG. 5 .

Comparative Example 3

Preparation of composition for surface treatment and artificial leather

A composition for surface treatment and artificial leather were prepared in the same manner as in Example 1, except that the first water-dispersible polyurethane resin was not used. The artificial leather prepared in Comparative Example 3 was photographed and shown in FIG. 6 .

Experimental Example 1. Glossiness evaluation

The glossiness of the surface-treated layers prepared in Examples and Comparative Examples was measured at 60° with a BYK (Micro-TRI-gloss) gloss meter, and the results are shown in Table 3 below.

Experimental Example 2. Adhesion evaluation

It was evaluated by the tape-crosscut test method. Specifically, a 1 mm interval 10 x 10 grid was made, and the degree of adhesion of the surface treatment layer after attaching and peeling the tape (TESA 4965) to the cut site was compared, and the results are shown in Table 3 below.

Evaluation criteria are shown in Table 1 below.

rank coating degree 5B The coating does not come off and the grid remains clean 4B Peel off within 5% of the total area of the grid 3B Exfoliation of more than 5% and no more than 15% of the total area of the grid 2B Exfoliation of more than 15% and no more than 35% of the total area of the grid 1B Exfoliation of more than 35% and no more than 65% of the total area of the grid 0B Exceeding 65% of the total area of the lattice peels off

Experimental Example 3. Dynamic friction coefficient and squeak evaluation

Using a universal testing machine, each of the two pieces of artificial leather according to the Examples and Comparative Examples was stacked up and down so that the surface treatment layers faced each other, and a 4.5 kg weight was combined on the upper portion of the artificial leather located above, and then the weight was set to 100. Pulling at a speed of mm/min was repeated three times. At this time, the required force deviation (ΔF) and the average force (F _a ) are calculated, the coefficient of kinetic friction (μ) shown in the following general formula (1) and the squeak index shown in the following general formula (2) are calculated, and the result is shown in Table 3 below. In the case of the force deviation (ΔF), the average value of the calculated values for each number of executions was used.

[General formula 1]

[General Formula 2]

In Formulas 1 and 2, W is the weight of the weight, ΔF is the deviation of the force required to pull the weight, and F _a is the average force required to pull the weight.

Experimental Example 4. Abrasion resistance evaluation

Using a Taber abrasion tester (Taber Abraser, Erichsen, 5135 Rotary platform abraser), the artificial leather of Examples and Comparative Examples was repeated 2000 times using a wear wheel CS-10 under a load of 1000 g, and the results are shown in Table 3 below. indicated.

Evaluation criteria are shown in Table 2 below.

rank degree of wear 5th grade No signs of wear and tear 4th grade Traces of wear are confirmed, but the amount is small and indistinct 3rd grade There is slight wear on the surface but no foam layer, or
Traces of wear and loss of prints, wrinkles, and gloss should be within 10% of the friction area. 2nd grade There is surface abrasion, and the foam layer is visible or the amount is within 50%. Grade 1 The foam layer is exposed on most of the friction part due to severe abrasion

Example Comparative Example 1 Comparative Example 2 Comparative Example 3 glossiness 1.2 1.2 0.7 15 adherence 5B 4B 0B 5B coefficient of friction 0.2 0.3 0.4 0.4 squeak 0.006 0.1 0.3 0.6 wear resistance 5 One One 3

It was confirmed that the artificial leather prepared in Examples had excellent soft feel and excellent abrasion resistance because the coefficient of kinetic friction and squeak of the surface treatment layer were lower than those of the artificial leather prepared in Comparative Examples 1 to 3.

In addition, it was confirmed that the artificial leather prepared in Examples had superior adhesion compared to the artificial leather prepared in Comparative Examples 1 and 2, and the glossiness of the surface treatment layer was lower than that of the artificial leather prepared in Comparative Example 3.

110: surface treatment layer
111: convex portion
112: recess
120: base layer
h ₁₁₁ : the height of the convex part
h ₁₁₂ : height of the recess

Claims (13)

base layer;
and a surface treatment layer in which the composition for surface treatment is cured on the base layer,
The surface treatment layer is artificial leather having a squeak index of 0.05 or less measured under a squeak test. The artificial leather according to claim 1, wherein the surface treatment layer has a coefficient of kinetic friction measured under a squeak test of 0.3 or less. The artificial leather of claim 1, wherein the surface treatment layer has a glossiness of 4 or less measured under a condition of 60° gloss. The method according to claim 1, wherein the composition for surface treatment comprises: a first water-dispersible polyurethane resin having an average particle diameter of 1 µm to 10 µm; and
Artificial leather comprising a second water-dispersible polyurethane resin having an average particle diameter of 1 nm to less than 1000 nm. The artificial leather according to claim 1, wherein the composition for the surface treatment layer does not contain a matting agent. [Claim 5] The artificial leather according to claim 4, wherein the surface treatment layer has an uneven structure by the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin. The artificial leather according to claim 6, wherein the concave-convex structure has a convex portion in a region where the first water-dispersible polyurethane resin exists, and a concave portion in a region where the second water-dispersion type polyurethane resin exists. The artificial leather according to claim 7, wherein an average height difference between the convex portion and the concave portion in the concave-convex structure is 0.5 μm to less than 2 μm. The artificial leather according to claim 4, wherein the first water-dispersible polyurethane resin and the second water-dispersible polyurethane resin are reactants of an isocyanate compound, a polyol, a neutralizing agent, an organic acid, water, and a chain extender. The artificial leather of claim 4, wherein the first water-dispersible polyurethane resin is included in an amount of 300 to 500 parts by weight based on 100 parts by weight of the second water-dispersible polyurethane resin. [Claim 5] The artificial leather according to claim 4, further comprising one or more additives selected from the group consisting of a thickener, an antifoaming agent, a wetting agent and a hardener. The artificial leather according to claim 1, wherein the base layer is a fiber layer comprising natural or synthetic leather. A seat for a vehicle comprising the artificial leather according to claim 1 .

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