JP5201667B2 - Leather-like sheet and method for producing the same - Google Patents

Description

  The present invention relates to a silver-like or nubuck-like leather-like sheet excellent in fastness and fullness and a method for producing the same.

  The leather-like sheet having a polymer elastic body layer on the surface is called with names such as a silvered tone, a silver rubbing tone, a nubuck tone, etc. depending on the presence or absence of the napped state, the number of napped hairs, and the napped length, etc. It is often used for furniture, automobile seats, etc. These leather-like sheets are generally produced by applying a polymer elastic body to a base material in which a nonwoven fabric is impregnated with a polymer elastic body (for example, Patent Document 1).

  However, when applying the polymer elastic body, there is a problem that the fastness is lowered because the dye contaminated with the polymer elastic body in the nonwoven fabric is transferred to the surface by the heat or solvent used. In addition, the drapeability is lowered due to the presence of the polymer elastic body, and it has been difficult to obtain a soft texture with low resilience from the rubbery resilience.

  On the other hand, what consists of a nonwoven fabric which does not impregnate a polymer elastic body can solve the said subject. For example, a leather-like sheet composed of an unimpregnated layer and an impregnated layer has been proposed (for example, Patent Document 2). According to this method, a rubber-like repulsion can be suppressed as compared with a leather-like sheet based on a nonwoven fabric impregnated with a polymer elastic body, and a leather-like sheet having a low rebound and excellent texture can be obtained. However, on the contrary, the form stability is lowered, and there is a problem that the leather-like sheet is distorted by long-term use and easily loses its shape. Therefore, it has been difficult to simultaneously achieve drapeability, flexible texture and form stability.

In addition, there exists a method of improving form stability by laminating | stacking a high-strength woven or knitted fabric on the nonwoven fabric used as a base material (for example, patent document 3). If this method is used, it is assumed that the bagging of the constant load method is excellent because it has a high form retentivity with respect to the load, but the bagging of the constant elongation method is insufficient because it is difficult to recover once it is stretched. No form stability has been achieved. Moreover, when the said technique was used, there existed a problem which the polymer elastic body apply | coated to the nonwoven fabric was easy to peel. Furthermore, when the polymer elastic body is applied, the polymer elastic body penetrates into the nonwoven fabric and the texture becomes hard, and the effect of using the nonwoven fabric not impregnated with the polymer elastic body is reduced.
Japanese Patent Application Laid-Open No. 7-133592 JP 2004-197232 A JP-A-10-131058

  An object of the present invention is to provide a leather-like sheet having excellent dry cleaning fastness, a soft texture, and excellent form stability.

The present invention has the following configuration in order to solve the above problems. That is, the leather-like sheet of the present invention includes a nonwoven fabric layer in which 0.0001 to 0.5 decitex ultrafine fibers are entangled with each other and is substantially made of a nonwoven fabric made of a fiber material, and unconstrained ultrafine fibers. It consists of a mixed layer provided with a polymer elastic body, and the unconstrained ultrafine fibers are continuous with the fibers constituting the nonwoven fabric .

Moreover, the manufacturing method of the leather-like sheet | seat of this invention manufactures the leather-like sheet | seat of this invention by the following processes.
A. Step of entanglement of ultrafine fiber-generating fibers having a single fiber fineness of 1 to 10 dtex, which can generate ultrafine fibers having a single fiber fineness of 0.0001 to 0.5 dtex, with a needle punch B. Step of generating ultrafine fiber nonwoven fabric layer by generating high-velocity fiber of 0.0001 to 0.5 dtex and then performing high-speed fluid treatment at a jet pressure of 10 MPa or more. B. buffing the nonwoven fabric in the ultrafine fiber nonwoven fabric layer Step of dyeing the ultrafine fiber nonwoven fabric layer A process of applying a polymer elastic body to the sheet surface to form a mixed layer of unconstrained ultrafine fibers and a polymer elastic body

  Since the leather-like sheet of the present invention is excellent in fastness, form stability, and wear resistance, it can be suitably used for clothing, furniture, car seats, miscellaneous goods and the like.

  The single fiber fineness of the nonwoven fabric constituting the leather-like sheet of the present invention consists of ultrafine fibers of 0.0001 to 0.5 dtex. The single fiber fineness is preferably 0.001 to 0.3 dtex, more preferably 0.005 to 0.15 dtex. If the single fiber fineness is less than 0.0001 dtex, the strength of the leather-like sheet decreases, which is not preferable. In addition, when the single fiber fineness exceeds 0.5 dtex, the surface quality of the leather-like sheet is lowered, the entanglement of the fibers is insufficient, and the shape stability is lowered, and the problem such as hardening of the texture is caused. Is also undesirable. In addition, a fiber having a single fiber fineness of less than 0.0001 dtex or a fiber having a single fiber fineness of more than 0.5 dtex may be included as long as the effect of the present invention is not impaired. The content of fibers having a single fiber fineness of less than 0.0001 dtex and fibers having a single fiber fineness of more than 0.5 dtex is preferably 30% or less of the fibers constituting the nonwoven fabric, and more preferably 10% or less. Most preferably, it is not included at all.

  The single fiber fineness referred to in the present invention is a value obtained by randomly selecting 100 fiber cross sections and measuring the cross sectional area, then calculating the number average of 100 fiber cross sectional areas, and calculating the fineness from the specific gravity of the fiber. Use. In addition, the value calculated | required according to JISL1015 8.14.2 (1999) is used for the specific gravity of a fiber.

  The nonwoven fabric in the present invention is one in which ultrafine fibers are entangled with each other. The form stability of the leather-like sheet is improved by entanglement of fibers. In the present invention, it is preferable that the ultrafine fibers are entangled with each other to such an extent that the nonwoven fabric shape can be maintained even when home washing is performed without fixing with a polymer elastic body or the like. Thereby, it is possible to obtain excellent bagging resistance and to obtain a dense surface appearance. In particular, when the fiber length is 1 cm or more, the effect of improving the form stability is remarkable. In a conventional leather-like sheet made of ultrafine fibers, when the fiber length is 1 cm or more, the leather-like sheet of the present invention usually has a structure in which the ultrafine fibers are entangled in a bundle of fibers. The sheet has a structure in which ultrafine fibers are intertwined with each other to such an extent that fiber bundles can hardly be confirmed. In addition, the fiber entangled in the state of the fiber bundle may be contained in the range which does not impair the form stability and abrasion resistance which are the effects of this invention.

  The nonwoven fabric may be made of short fibers or long fibers. The short fiber nonwoven fabric is preferable in terms of a high-quality surface, but the long fiber nonwoven fabric is preferable in that the manufacturing process can be simplified. Moreover, in the case of a short fiber nonwoven fabric, it can classify | categorize into a dry nonwoven fabric and a wet nonwoven fabric from the manufacturing method, However, Since a dry nonwoven fabric can form a high quality surface, it is preferable.

  Although the fiber length in the case of a short fiber is not specifically limited, 20 mm or more is preferable and 30 mm or more is more preferable. Moreover, 100 mm or less is preferable and 70 mm or less is more preferable. When the fiber length is 20 mm or more, the wear resistance is improved, and when the fiber length is 100 mm or less, the surface quality tends to be improved. Furthermore, for the purpose of improving the surface quality, it is also a preferable aspect to mix ultrafine fibers of 0.1 mm or more and less than 20 mm in ultrafine fibers of 20 mm to 100 mm.

  The fiber length referred to in the present invention is the number average of 300 measured fiber lengths after 100 fibers are extracted from each of three arbitrary locations and the fiber length is measured.

  In the case of a long-fiber non-woven fabric, a non-woven fabric obtained by a spunbond method can be used, and if it is collected in the form of a continuous filament, part of the fiber is cut in the process of forming a leather-like sheet. May be.

  In the present invention, the nonwoven fabric is substantially made of a fiber material. Thereby, when apply | coating a polymeric elastic body to the surface, the bleeding of dye etc. which are contaminated in the polymeric elastic body impregnated with the nonwoven fabric can be suppressed, and fastness and discoloration resistance can be improved. It also has excellent flexibility.

  The term “substantially made of a fiber material” as used in the present invention means a material that does not substantially contain a polymer elastic body. The term “substantially free of polymer elastic body” means that the nonwoven fabric contains no polymer elastic body at all and also contains a small amount of polymer elastic body as long as the effects of the present invention are not impaired. It is acceptable. Specifically, the polymer elastic body contained in the leather-like sheet is preferably 5% by weight or less, more preferably 3% by weight or less, still more preferably 1% by weight or less, and quite high. Most preferably, no molecular elastic body is contained. When the polymer elastic body is 5% by weight or less, a decrease in fastness can be suppressed.

  The nonwoven fabric layer of the present invention preferably has a bagging resistance value of 4 to 8 mm obtained by JIS L 1061 (1987) B-1 method (constant load method). More preferably, it is 7 mm or less, More preferably, it is 6 mm or less. When the value of the bagging resistance in the constant load method is 8 mm or less, it becomes difficult to lose its shape particularly in a portion where force is easily applied. On the other hand, the smaller this value is, the better the bagging resistance is. However, in the present invention, emphasis is placed on the feeling of wear of the clothing and the moldability of the molded body, and the object is to provide an item with excellent familiarity. Therefore, it is preferably 4 mm or more, more preferably 5 mm or more.

  The nonwoven fabric layer of the present invention preferably further has a bagging resistance value of 4 to 8 mm obtained by JIS L 1061 (1987) B-2 method (constant elongation method). More preferably, it is 7 mm or less, More preferably, it is 6 mm or less. When the value of the bagging resistance in the constant elongation method is 8 mm or less, it becomes difficult to lose the shape particularly in a portion that is easily stretched. In the present invention, the emphasis is on wear feeling of clothing and moldability in a molded body, and it is intended to provide an item having excellent familiarity, so that it is preferably 4 mm or more, more preferably 5 mm or more. It is.

  In particular, by making the bagging resistance of the constant elongation method and the constant load method compatible within a specific range, it is possible to provide clothing and materials that can be used for a long time without being out of shape. Moreover, peeling from the silver surface layer hardly occurs, and a high-quality leather-like sheet can be obtained. In order to obtain a textured leather-like sheet with silver, it is common to form a silver surface layer made of a polymer elastic body layer such as polyurethane on the surface layer. When a polymer elastic body is present in the nonwoven fabric layer, there is a problem that dyes contaminating the polymer elastic body migrate and the fastness is lowered, but in the present invention, the fastness is hardly lowered. Therefore, this is a preferred embodiment in that the effect of the present invention can be further exhibited.

  Here, if the elongation rate of the nonwoven fabric layer is 5% or more, it is particularly preferable in that the bagging resistance by the constant elongation method can be improved. The higher the elongation rate, the better the tendency. However, when it is 25% or less, the bagging resistance by the constant load method is improved, which is preferable.

  Furthermore, it is preferable that the elongation rate is in the range of 5 to 25% in both the vertical direction and the horizontal direction. If only one of them is present, either the above-described constant elongation method or constant load method, or both of them tend to be inferior in bagging resistance. Therefore, it is preferable that both be in the range of 5 to 25%. The ratio of the elongation ratio in the vertical direction and the horizontal direction is important for the bagging resistance of the constant elongation method and the constant load method to be within the numerical range of the present invention, and the elongation ratio in the vertical direction is divided by the elongation ratio in the horizontal direction. The value is preferably in the range of 0.6 to 1.3, more preferably 0.6 to 1.1, and even more preferably 0.7 to 1.0. When it is 0.6 or more and 1.3 or less, good bagging resistance can be obtained without the load or elongation being biased in a certain direction.

  The elongation rate referred to in the present invention is a load of 14.7 N applied to a test piece width of 5 cm (grip interval 20 cm) defined by JIS L 1096 (1999) 8.14.1 A method (constant speed elongation method). The elongation rate (%) in the case (2.94 N per 1 cm width of the test piece).

  The nonwoven fabric layer of the present invention preferably has an elongation recovery rate in any one direction of 80% or more, more preferably 85% or more, and further preferably 90% or more. An elongation recovery rate of 80% or more is preferable because it is less likely to lose its shape due to repeated elongation. In addition, it is more preferable that both the vertical direction and the horizontal direction are 80% or more. By being excellent in the elongation recovery rate in any direction, it is possible to improve the bagging resistance particularly in the constant elongation method of the present invention. Here, the elongation recovery rate is defined by the JIS L 1096 (1999) 8.14.2 A method (grab interval 20 cm).

  In the present invention, the formation direction of the nonwoven fabric layer is the vertical direction and the width direction is the horizontal direction. The formation direction can be generally determined from a plurality of elements such as the orientation direction of the constituent fibers, streak traces or treatment traces by needle punching or high-speed fluid treatment, and the texture of the knitted or knitted fabric. If it is impossible to estimate and judge the vertical direction for reasons such as conflicting judgments due to these multiple factors, lack of clear orientation, or streak traces, the maximum tensile strength The vertical direction is the vertical direction, and the direction perpendicular thereto is the horizontal direction.

The basis weight of the nonwoven fabric layer is preferably 50 g / m ² or more, more preferably 80 g / m ² or more, and further preferably 100 g / m ² or more. It is preferably 500 g / m ² or less, more preferably 400 g / m ² or less, and even more preferably 300 g / m ² or less. If it is 50 g / m ² or more, a dense surface layer can be easily formed. Moreover, if it is 500 g / m < ² > or less, a texture becomes flexible and higher abrasion resistance can be obtained.

  In addition, the nonwoven fabric layer mentioned above shall refer to the thing containing the laminated knitted fabric, when the woven / knitted fabric mentioned later is laminated | stacked.

  The fibers constituting the nonwoven fabric layer are preferably made of inelastic fibers. Specifically, fibers made of polyester, polyamide, polypropylene, polyethylene or the like are preferably used. Elastic fibers such as polyether ester fibers and polyurethane fibers such as so-called spandex are not preferable.

  The polyester is not particularly limited as long as it can be fiberized. Specifically, for example, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polycyclohexylene dimethylene terephthalate, polylactic acid, polyethylene-2,6-naphthalenedicarboxylate, polyethylene-1,2-bis (2-chlorophenoxy) ethane-4,4′-dicarboxylate and the like. Of these, the most commonly used polyethylene terephthalate or a polyester copolymer mainly containing ethylene terephthalate units is preferably used.

  Examples of the polyamide include polymers having an amide bond such as nylon 6, nylon 66, nylon 610, nylon 12, and the like.

  To these polymers, inorganic particles such as titanium oxide particles may be added to the polymer in order to improve the concealing properties, lubricants, pigments, heat stabilizers, ultraviolet absorbers, conductive agents, heat storage materials, It can also be added according to various purposes such as antibacterial agents.

  In the present invention, it is preferable that a nonwoven fabric and a woven or knitted fabric are laminated as the nonwoven fabric layer in terms of obtaining good bagging resistance. When there is no woven or knitted fabric, it is possible to improve the bagging resistance in the constant load method, for example, by applying a large amount of the polymer elastic body. However, as the texture hardens, the bagging resistance in the constant elongation method tends to decrease. Here, the woven or knitted fabric refers to a woven fabric and a knitted fabric. However, since the knitted fabric tends to be inferior in form stability as compared with the woven fabric, the woven fabric is more preferably a woven fabric.

  The fiber used in the woven or knitted fabric is not particularly limited, but is selected in consideration of the fact that it greatly affects the stretch rate and the bagging resistance of the leather-like sheet, and is preferably a fiber having stretchability. Moreover, in order to prevent the irritation | stimulation by the exposure to the surface, it is preferable that it is an inelastic fiber. In consideration of recyclability, dyeability, and the like, it is more preferable to select the fibers constituting the leather-like sheet, that is, the fibers constituting the nonwoven fabric and the woven / knitted fabric to be a single material.

  Here, the single material refers to a range of materials that can be dyed with the same dye at a level that does not cause any practical problems. Polytrimethylene terephthalate and the like and copolymers thereof are included, but nylon 6 which causes a problem in fastness is not included. Conversely, if it is a single polyamide material, it means nylon 6, nylon 66, nylon 12, etc. that can be dyed with an acid dye, and copolymers thereof.

  Moreover, it is preferable that the elongation rate of a woven / knitted fabric is 5 to 40% of any one direction, It is more preferable that it is 10 to 30%, It is further more preferable that it is 10 to 25%. In particular, an elongation rate of 5% or more is preferable in that the bagging resistance of the constant elongation method can be improved. Moreover, when it is 40% or less, it is preferable at the point which can improve the bagging-proof property of the constant load method of a nonwoven fabric layer, and can prevent the drape property and form stability deterioration. In addition, it is a preferable aspect from the viewpoint of obtaining favorable bagging resistance that both the vertical direction and the horizontal direction are in the above range.

  Furthermore, when the woven or knitted fabric is laminated, the elongation rate of the nonwoven fabric layer is greatly affected by the elongation rate. Therefore, the value obtained by dividing the elongation rate in the vertical direction by the elongation rate in the horizontal direction is 0.6 to 1.3. Therefore, it is preferable that the warp direction elongation rate and the horizontal direction elongation rate of the woven or knitted fabric be in the range of 0.6 to 2.5. Here, it is effective to make the woven or knitted fabric larger than the nonwoven fabric with respect to a value obtained by dividing the elongation rate in the vertical direction by the elongation rate in the horizontal direction. This is because the stretch rate in the horizontal direction can reflect the influence of the woven or knitted fabric relatively strongly, whereas the stretch rate in the vertical direction tends to decrease due to the process tension.

  The structure of the woven or knitted fabric is not particularly limited, and examples of the woven fabric include plain weave, twill weave and satin weave, and examples of the knitted fabric include warp knitting and weft knitting. Of these, a plain weave is preferable from the viewpoint of cost and smoothness, but a crest or the like can be appropriately selected from the viewpoint of improving the air flow rate.

Further, the basis weight of the woven or knitted fabric can be appropriately adjusted according to the basis weight of the intended leather-like sheet. In the case of clothing use, it is preferably 10 g / m ² or more, more preferably 30 g / m ² or more. Further, it is preferably 300 g / ^{m 2} or less, more preferably 200 g / ^{m 2} or less. If the basis weight of the woven or knitted fabric is less than 10 g / m ² , the form of the woven or knitted fabric is unstable, the handleability is deteriorated, and if it exceeds 300 g / m ² , the drapeability of the leather-like sheet is preferably reduced. Absent.

  The weight ratio of the woven or knitted leather-like sheet is preferably 10% or more of the entire leather-like sheet, and more preferably 20% or more. Moreover, it is preferable that it is 50% or less, and it is more preferable that it is 40% or less. When the weight ratio is 10% or more, it becomes easy to reflect the bagging resistance and the characteristics of the woven or knitted fabric on the leather-like sheet. However, when the weight ratio exceeds 50%, the obtained leather-like sheet has a texture like a woven or knitted fabric, and it is difficult to obtain a high-grade feeling as a leather-like sheet, and the bagging resistance is also deteriorated.

  In addition, the nonwoven fabric layer as used in the field of this invention is a layer which has the nonwoven fabric which consists essentially of a fiber material, Comprising: The mixed layer of the unconstrained extra fine fiber and polymer elastic body mentioned later were excluded from the leather-like sheet | seat of this invention. Say part. Therefore, values such as the physical properties of the nonwoven fabric layer in the present invention are the nonwoven fabric before applying the polymer elastic body to form the mixed layer, or until the polymer elastic body layer cannot be clearly observed with the naked eye from the leather-like sheet. Any part removed by grinding or the like may be measured, and any part may be included in the scope of the present invention.

  The leather-like sheet of the present invention is characterized in that it has a layer (mixed layer) in which a polymer elastic body is imparted to unrestrained ultrafine fibers and these are mixed. By applying a polymer elastic body to the unconstrained fibers, it becomes possible to obtain a softer texture than when a polymer elastic body is applied to the constraining fibers. The unconstrained fiber means a fiber having a degree of freedom that allows the direction to be easily changed by rubbing the fiber with a hand or the like before the polymer elastic body is applied. The part which raised the nonwoven fabric entangled by fluid processing etc. by raising with a cloth and sandpaper is mentioned. However, in the state of the “mixed layer” provided with the polymer elastic body, it is “restrained” by the polymer elastic body. It also includes simply intersecting ultrafine fibers that are not substantially entangled. When using the napping formed by raising process as a non-restraining fiber, the length is preferably 0.1 to 5 mm. More preferably, it is 0.5 mm or more, More preferably, it is 1 mm or more. Further, it is more preferably 4 mm or less, and further preferably 3 mm or less. If it is 0.1 mm or more, it is easy to form a mixed layer. On the other hand, if it is 5 mm or less, it is not necessary to thicken the mixed layer, and a leather-like sheet having a soft texture can be obtained. The unconstrained fibers are preferably continuous with the fibers constituting the fabric from the viewpoint of obtaining a peel strength and a feeling of unity. For example, as described above, the fibers are obtained by raising the fabric. Is preferred.

  The polymer elastic body is preferably porous in that a more flexible texture can be obtained. The polymer elastic body is not particularly limited, but polyurethane and the like are preferable in that both flexibility and physical properties can be achieved. There is no restriction | limiting in particular as a kind of polyurethane, For example, polyether diol type, polyester diol type, and polycarbonate diol type polyurethane can be used. Moreover, a crosslinking agent, proteins such as collagen and fibroin, weathering agents such as antioxidants and ultraviolet absorbers, pigments, dyes, flame retardants, water repellents and the like can be included as necessary.

  In the leather-like sheet according to the present invention, since there is a mixed layer composed of unconstrained ultrafine fibers and a polymer elastic body, the polymer elastic body is compared with a leather-like sheet formed of a layer composed only of the polymer elastic body. However, it is possible to obtain excellent wear resistance and flexibility without easily peeling. The present invention is preferably a textured leather-like sheet with silver in that the effect can be more exhibited, but it is also possible to buff the mixed layer into a nubuck-like leather-like sheet.

The basis weight of the leather-like sheet of the present invention is preferably 130 g / m ² or more, more preferably 150 g / m ² or more, and further preferably 170 g / m ² or more. Moreover, Preferably it is 550 g / m < ² > or less, More preferably, it is 500 g / m < ² > or less, More preferably, it is 450 g / m < ² > or less. It is preferable that the basis weight of the leather-like sheet is 130 g / m ² or more because the shape stability is improved and a good rebound is easily obtained. Moreover, when the fabric weight of a leather-like sheet | seat is 550 g / m < ² > or less, since there exists a tendency for the workability to various uses to improve, it is preferable.

  The leather-like sheet is preferably dyed, particularly in the case of clothing, furniture, car seats and the like. In the present invention, since the nonwoven fabric is substantially made of a fiber material and hardly contains a polymer elastic body, there is almost no dye contaminated by the polymer elastic body even when it is dyed. Therefore, it is possible to suppress the bleeding of the dye that occurs when the polymer elastic layer is formed, and it is possible to obtain high dry cleaning fastness in addition to the suppression of discoloration. In particular, when the fiber is made of polyester, the disperse dye used for dyeing the polyester is likely to contaminate the polymer elastic body, which is a preferable embodiment in that the effect becomes more remarkable.

  It is preferable that the fiber constituting the nonwoven fabric layer of the present invention is a polyester that is dyed as described above, and the contamination of the fastness to dry cleaning is grade 3 or higher. More preferably, it is quaternary or higher. If it is 3rd grade or higher, it is possible to prevent contamination of other dyed articles in dry cleaning. In addition, the pollution of the dry cleaning fastness said by this invention means the pollution measured by JISL0860 (1996) A method.

  The leather-like sheet of the present invention has other dyes, softeners, texture modifiers, anti-pilling agents, antibacterial agents, deodorants, water repellents, light resistance, in addition to those described above, within the scope not departing from the effects of the present invention. Functional agents such as agents and antifungal agents may be included.

  Next, an example of the manufacturing method which obtains the leather-like sheet | seat of this invention is described.

  In the leather-like sheet of the present invention, the production method of so-called ultrafine fibers constituting the nonwoven fabric is not particularly limited, and other than the usual filament spinning method, the nonwoven fabric such as the spunbond method, the melt blow method, the electrospinning method, the flash spinning method, etc. The method of manufacturing as may be sufficient. In addition, as a means for obtaining ultrafine fibers, a method of directly spinning ultrafine fibers may be used, but ultrafine fibers having a single fiber fineness of 1 to 10 dtex can be generated, and ultrafine fibers having a single fiber fineness of 0.0001 to 0.5 dtex can be generated. A method of spinning a mold fiber (hereinafter referred to as an ultrafine fiber generating fiber) and then generating an ultrafine fiber is preferred.

  Here, as a method of obtaining ultrafine fibers using ultrafine fiber generation type fibers, specifically, a method of removing sea components after spinning sea-island type fibers, or splitting after spinning of split-type fibers Thus, it is possible to adopt means such as a method of ultra-thinning.

  Among these means, in the present invention, it is preferable to produce ultrafine fibers from the viewpoint that ultrafine fibers can be obtained easily and stably. Further, when a leather-like sheet is used, the same kind is used. It is more preferable to manufacture with an island-in-sea fiber in that an ultrafine fiber made of the same kind of polymer that can be dyed with a dye can be easily obtained.

It does not specifically limit as a method of obtaining a sea-island type fiber, For example, the method etc. which are described in the following (1)-(4) are mentioned.
(1) A method of spinning by blending two or more polymers in a chip state.
(2) A method in which a polymer of two or more components is kneaded in advance to form a chip and then spun.
(3) A method in which two or more polymers in a molten state are mixed in a spinning machine pack using a static kneader or the like.
(4) A method for producing using a composite die such as JP-B-44-18369 and JP-A-54-116417.

  In the present invention, any method can be used for satisfactory production, but the method (4) or a method similar thereto is preferred in that the polymer can be easily selected.

  In the method (4), the cross-sectional shape of the island fiber obtained by removing the sea-island fiber and the sea component is not particularly limited. For example, the shape is round, polygonal, Y-shaped, H-shaped, X-shaped. Examples include a shape, a W shape, a C shape, and a π shape.

  The number of polymer species to be used is not particularly limited, but it is preferably 2 to 3 components in consideration of spinning stability and dyeability. Particularly, the sea component is 1 component and the island component is 1 component. It is preferable to be composed of a total of two components. The component ratio at this time is preferably 0.3 or more by weight ratio of island fibers to sea-island fibers, more preferably 0.4 or more, and even more preferably 0.5 or more. Moreover, it is preferable that it is 0.99 or less, 0.97 or less is more preferable, and 0.8 or less is further more preferable. If it is less than 0.3, the removal rate of sea components increases, which is not preferable in terms of cost. On the other hand, if it exceeds 0.99, the island components tend to be joined together, which is not preferable in terms of spinning stability.

  Further, the method for producing the sea-island type fiber is not particularly limited. For example, after the undrawn yarn spun at a spinning speed of usually 2500 m / min or less using the die shown in the method (4) above is taken up. , Wet heat, dry heat, or both, and a method of drawing in one to three steps, or a method of drawing at a spinning speed of 4000 m / min or more.

  Next, the obtained ultrafine fiber or ultrafine fiber-generating fiber is formed into a web. As the method, when the non-woven fabric is a short fiber non-woven fabric, a dry method using a card, a cross wrapper, a random weber or the like, or a wet method such as a papermaking method can be employed. In the case of a long-fiber nonwoven fabric, a spunbond method can be employed.

  In this invention, the dry method which combined the 2 types of entanglement methods of a needle punch method and a high-speed fluid process is preferable at the point which can manufacture the nonwoven fabric which consists of a fiber material easily.

In the case of the dry method, the apparent density of the web is preferably 0.12 g / cm ³ or more, and more preferably 0.15 g / cm ³ or more, by needle punching with respect to the web obtained from the ultrafine fiber generating fiber. To do. Further, it is preferably 0.30 g / cm ³ or less, more preferably 0.25 g / cm ³ or less. If the apparent fiber density is less than 0.12 g / cm ³ , the fiber entanglement is insufficient, and it is difficult to obtain good values for physical properties such as tensile strength, tear strength, and abrasion resistance. The upper limit of the apparent fiber density is not particularly limited, but if it exceeds 0.30 g / cm ³ , problems such as breakage of the needle needle and remaining of the needle hole are not preferable.

  Moreover, when performing needle punching, it is preferable that the single fiber fineness of an ultrafine fiber generation type | mold fiber is 1 dtex or more, and 2 dtex or more is more preferable. Further, it is preferably 10 dtex or less, more preferably 8 dtex or less, and further preferably 6 dtex or less. When the single fiber fineness is less than 1 dtex or exceeds 10 dtex, the entanglement by the needle punch becomes insufficient, and it becomes difficult to obtain good physical properties.

In the present invention, it is preferable that the needle punch not only has a role as a temporary fixing for obtaining process passability but also has a role of sufficiently entanglement of fibers. Therefore, the driving density is preferably 100 / cm ² or more, more preferably 500 / cm ² or more, and still more preferably 1000 / cm ² or more. Moreover, it is preferable to use a 1 barb type in terms of excellent surface quality.

  On the other hand, in the case of the spunbond method, a polymer is melted and discharged from a die to form a continuous filament, which is spun at a speed of 2000 to 8000 m / min by a pulling action such as an ejector and collected on a moving collection device. Thus, a long fiber web can be obtained.

  The obtained long fiber web is preferably entangled without being wound from the viewpoint of cost, but can also be wound once from the viewpoints of transportability, handleability, adjustment of production speed, and the like. In this case, from the viewpoint of imparting a certain form stability for winding, press treatment can be performed under heating at 80 to 240 ° C., but needle punching is performed in the same manner as described above in terms of excellent texture and quality. Preferably it is done.

  The short fiber or long fiber web thus obtained is preferably shrunk by dry heat treatment or wet heat treatment, or both, and further densified.

  Next, the web made of ultrafine fiber generating fibers is made into an ultrafine fiber web by ultrafine treatment, and the ultrafine fiber web is entangled with each other by high-speed fluid treatment to obtain a nonwoven fabric. The high-speed fluid treatment may be performed after the ultrafine processing, or the high-speed fluid processing may be performed simultaneously with the ultrafine processing. Further, high-speed fluid processing may be performed simultaneously with the ultrafine processing, and then further high-speed fluid processing may be performed. When the high-speed fluid treatment is performed at the same time as the ultrafine treatment, it is preferable to perform the high-speed fluid treatment at least after the ultrafine treatment is mostly completed in order to further promote the entanglement between the ultrafine fibers. It is more preferable to perform high-speed fluid processing after performing ultrafine processing.

  The ultrafine treatment method is not particularly limited, and examples thereof include a mechanical method and a chemical method. The mechanical method is a method of making ultrafine fiber generating fibers fine by applying a physical stimulus. Specifically, for example, in addition to the method of giving an impact such as the needle punch method or the water jet punch method, a method of pressurizing between rollers, a method of performing ultrasonic treatment, and the like can be mentioned. Moreover, as a chemical method, the method of giving a change of swelling, decomposition | disassembly, melt | dissolution, etc. with a chemical | medical agent with respect to at least 1 component which comprises a sea-island type fiber, for example is mentioned. In particular, the method of producing a web with ultrafine fiber-generating fibers using an alkali-degradable polymer as a sea component, and then treating the web with a neutral to alkaline aqueous solution to make it ultrafine does not use an organic solvent. Since it is preferable, it is one of the preferable embodiments of the present invention. The neutral to alkaline aqueous solution here is an aqueous solution having a pH of 6 to 14. For example, an aqueous solution containing an organic or inorganic salt and exhibiting a pH in the above range can be preferably used. Examples of the organic or inorganic salts include alkali metal salts such as sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate and sodium hydrogen carbonate, and alkaline earth metal salts such as calcium hydroxide and magnesium hydroxide. Further, if necessary, amines such as triethanolamine, diethanolamine, monoethanolamine, a weight loss accelerator, a carrier, and the like can be used in combination. Of these, sodium hydroxide is preferable in terms of price and ease of handling. Further, after the neutral to alkaline aqueous solution treatment described above is applied, it is preferably neutralized and washed as necessary to remove residual chemicals and decomposition products, and then dried.

  As the high-speed fluid treatment, a water jet punch treatment using a water flow is preferable from the viewpoint of the working environment. In the water jet punching process, water is preferably performed in a columnar flow state. The columnar flow is usually obtained by ejecting water from a nozzle having a diameter of 0.06 to 1.0 mm at an injection pressure of 1 to 60 MPa. In order to obtain a nonwoven fabric with efficient entanglement and good surface quality, the nozzle diameter is preferably 0.06 to 0.15 mm, and the interval is preferably 5 mm or less, the diameter is 0.08 to 0.14 mm, and the interval is 1 mm or less is more preferable. The nozzle plates of these configurations do not need to be the same when processing multiple times, for example, using a nozzle plate including nozzles with a large hole diameter and a small hole diameter, using a nozzle plate with a different structure in combination, It is also possible to use a nozzle plate outside the above range. When the diameter of the nozzle exceeds 0.15 mm, the entanglement between the ultrafine fibers decreases and the surface smoothness also decreases, which is not preferable. Therefore, a smaller nozzle hole diameter is preferable, but if it is less than 0.06 mm, nozzle clogging is likely to occur, and this is not preferable because the cost is increased due to the necessity of highly filtering water. Further, if the nozzle interval exceeds 5 mm, the generated streaks tend to stand out, which is not preferable. In order to achieve uniform entanglement in the thickness direction and / or to improve the smoothness of the nonwoven fabric surface, it is preferable to repeat the high-speed fluid treatment a plurality of times.

  The jetting pressure of the fluid is appropriately selected depending on the basis weight of the ultrafine fiber web to be processed, and the higher the basis weight, the higher the pressure. Furthermore, in order to highly entangle the ultrafine fibers and obtain the desired physical properties such as tensile strength, tear strength, and abrasion resistance, it is preferable to perform the treatment at least once with an injection pressure of 10 MPa or more. The pressure is more preferably 15 MPa or more, and further preferably 20 MPa or more. The upper limit of the pressure is not particularly limited, but the cost increases as the pressure increases, and in the case of a low-weight nonwoven fabric, the nonwoven fabric is likely to be non-uniform, and fluff may be generated by cutting the fibers. Is 40 MPa or less, more preferably 35 MPa or less.

  Note that at least one process means that the process is performed by one nozzle head (one injector) including a nozzle plate having a plurality of nozzle holes. When processing is continuously performed with a plurality of nozzle heads, the number of times of the plurality of nozzle heads is processed, and the number is not counted once.

  In the case of ultrafine fibers obtained from ultrafine fiber generation type fibers, it is common that the ultrafine fibers are intertwined in a bundled fiber bundle, but by performing high-speed fluid treatment under the above conditions, It is possible to obtain an ultrafine fiber nonwoven fabric in which ultrafine fibers are entangled with each other to such an extent that entanglement in a fiber bundle state is hardly observed. As a result, the fiber bundles are once entangled with each other, and in addition to this, the ultrafine fibers are entangled, and a nonwoven fabric substantially made of a fiber material having excellent shape stability can be obtained. In addition, you may perform a water immersion process before performing a high-speed fluid process. Furthermore, in order to improve the quality of the surface of the nonwoven fabric, a method of relatively moving the nozzle head and the nonwoven fabric, a method of inserting a wire mesh between the nonwoven fabric and the nozzle, and performing a watering treatment can be performed.

  In addition, as a method of performing ultrafine treatment and high-speed fluid treatment at the same time, for example, a method of using sea-island fibers using a water-soluble polymer as a sea component, and removing sea components and entanglement of ultrafine fibers by a water jet punch , Using sea-island fibers using an alkali-soluble polymer as a sea component, and after decomposing the sea component through an alkali treatment liquid, performing a final removal of the sea component and entanglement treatment of ultrafine fibers by a water jet punch, Etc.

  When laminating a nonwoven fabric and a woven or knitted fabric, the laminating method is not particularly limited and can be performed by adhesion, entanglement, or the like. In this case, it can be carried out by needle punching or high-speed fluid treatment according to the method for producing the nonwoven fabric, but laminating by high-speed fluid treatment is particularly preferred because damage to the woven or knitted fabric can be prevented.

  The nonwoven fabric layer thus obtained is then raised. As the raising method, buffing with a needle cloth raising or sandpaper can be adopted, but buffing is preferable because fine napping is formed and a uniform surface is obtained.

  In order to improve the quality, it is preferable to dye the nonwoven fabric. The dyeing method is not particularly limited, and the dyeing machine to be used may be any of a liquid dyeing machine, a thermosol dyeing machine, a high-pressure jigger dyeing machine, etc., but the liquid dyeing is advantageous in that the texture of the obtained leather-like sheet is excellent. It is preferable to dye using a machine. Moreover, when laminating a woven fabric and a non-woven fabric having excellent extensibility, the woven fabric may be stretched by process tension, and the longitudinal elongation rate of the leather-like sheet may be lowered. In this case, it is preferable to relax by imparting a stagnation effect with a liquid dyeing machine or the like in terms of improving the extensibility in the vertical direction.

  In addition, a water repellent, a penetrating agent, a softening agent, a resin, fine particles, and the like can be added as necessary. As the means, a pad method, a method using a liquid dyeing machine or a jigger dyeing machine, or spraying can be used. The method of spraying can be selected as appropriate.

Next, a polymer elastic body is applied. At this time, the polymer elastic body is preferably 10 to 300 g / m ² with respect to the nonwoven fabric layer, and the thickness is preferably 30 to 150 μm from the viewpoint of texture and crease.

  There is no restriction | limiting in particular as a method to apply | coat to a base material, The method of apply | coating directly on the surface of a base material and the method of bonding both after forming a base material and a film | membrane separately are employable. As a method of directly applying to the surface of the substrate, methods such as reverse roll coating, knife coating, gravure coating, slit coating, and spraying can be used. Among these, the gravure coating method is preferably employed because a mixed layer of fibers and a polymer elastic body can be formed more easily. In addition, after forming the substrate and the film separately, pasting them together, for example, forming the film alone and then integrating it with the substrate, or transferring the film onto the substrate after forming the film on the release paper However, in this case, since it is necessary to form a mixed layer with the fiber, it is necessary to form a fluidized state after overlapping with the nonwoven fabric layer. As a method for solidifying the polymer elastic body, any of a dry method and a wet method may be used as long as the object of the present invention is satisfied.

  In the case of a leather-finished leather-like sheet having a silver surface layer, a surface treatment for improving wear resistance and the like can be performed as necessary after forming a silver surface layer of a polymer elastic body. In addition, in the case of a leather-like sheet having a suede or nubuck-like nap, it can be obtained by raising the surface of the laminated sheet obtained by the above-mentioned production method with sandpaper or a brush.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, the following method was used for the measuring method of each physical-property value in an Example.

(1) Fiber basis weight, fiber apparent density The fiber basis weight (g / m ² ) was measured by the method described in JIS L 1096 8.4.2 (1999). In addition, as thickness (mm), a dial thickness gauge (manufactured by Ozaki Mfg. Co., Ltd., trade name “Peacock H”) was randomly measured at 10 locations to obtain an average value and rounded off to the third decimal place. Was used to determine the apparent fiber density (g / cm ³ ) by dividing the basis weight value by the thickness value and rounded off to the second decimal place.

(2) Elongation rate, elongation recovery rate The elongation rate was measured by JIS L 1096 (1999) 8.14.1 A method (constant speed elongation method) (the gripping interval is 20 cm).

  Further, the elongation recovery rate was determined by the JIS L 1096 (1999) 8.14.2 A method (repetitive constant speed extension method) (repeated constant speed extension method) (the gripping interval is 20 cm).

(3) Bagging resistance The bagging resistance was evaluated by JIS L 1061 (1987) B-1 method (constant load method) and B-2 method (constant elongation method).

(4) Fiber length 100 fibers were each extracted from arbitrary three places, and fiber length was measured. The number average of 300 measured fiber lengths was determined.

(5) Single fiber fineness After 100 cross-sectional areas were selected at random using an optical microscope and the cross-sectional area was measured, the number average of 100 cross-sectional areas was determined. From the average value of the obtained fiber cross-sectional area and the specific gravity of the fiber, the fineness was obtained by calculation. The specific gravity of the fiber was measured based on JIS L 1015 (1999).

(6) Fastness to dry cleaning Contamination was evaluated by A method based on the dyeing fastness test method for dry cleaning specified in JIS L 0860 (1996).

Production Example 1
A low viscosity component composed of 100% polyethylene terephthalate having an intrinsic viscosity of 0.50 and a high viscosity component composed of polyethylene terephthalate having an intrinsic viscosity of 0.75 are bonded to the side-by-side at a weight composite ratio of 50:50 and spun and stretched. A composite fiber of 56 dtex 12 filaments was obtained. This was twisted at 1300 T / m and then woven at a density of 94 × 65 / 2.54 cm.

  Subsequently, it processed at 85-98 degreeC with the softener, and it processed at 115 degreeC with the liquid dyeing machine, Then, it set by the tenter at 3% of overfeed rate and 180 degreeC.

The density of the obtained woven fabric was 123 × 89 pieces / 2.54 cm, the basis weight was 64.1 g / m ² , the elongation was 18.9% in length, and 22.4% in width.

Production Example 2
A false twisted yarn made of polyethylene terephthalate with 56 dtex 24 filaments was used as warp, and the weft was plain-woven using the same fibers as used in Production Example 1, and woven at a weaving density of 93 × 80 / 2.54 cm. . Thereafter, a relaxation treatment was performed in the same manner as in Production Example 1.

The density of the obtained woven fabric was 118 × 84 pieces / 2.54 cm, the weight per unit area was 70.9 g / m ² , and the elongation was 5.0% vertical and 34.3% horizontal.

Example 1
A web was prepared by passing sea island type composite short fibers having a single fiber fineness of 3 dtex, 36 islands, and a fiber length of 51 mm consisting of 45 parts by weight of polystyrene as a sea component and 55 parts by weight of polyethylene terephthalate as an island component through a card machine and a cross wrapper. . The obtained web was subjected to needle punching at a driving density of 2500 / cm ² using a 1 barb type needle punching machine to obtain a composite short fiber nonwoven fabric having an apparent fiber density of 0.22 g / cm ³ . Next, it is immersed in an aqueous solution of 5% by weight of polyvinyl alcohol (PVA) having a polymerization degree of 500 and a saponification degree of 88% heated to 95 ° C. for 2 minutes. The impregnation was carried out at the same time as the amount of adhesion was reduced. Thereafter, the nonwoven fabric was dried at 100 ° C. to remove moisture. Next, the composite short fiber nonwoven fabric was treated with trichlene at a liquid temperature of 30 ° C. until the polystyrene was completely removed, thereby expressing ultrafine fibers having a single fiber fineness of 0.046 dtex from the composite short fibers. The resulting sheet was split into two pieces perpendicular to the thickness direction using a standard splitting machine manufactured by Murota Manufacturing Co., Ltd., and an ultrafine fiber web having a fiber basis weight of 90.5 g / m ^2. Got.

On the other hand, on the paper web made of polyethylene terephthalate having a single fiber fineness of 0.33 dtex, a fiber length of 5 mm, and a basis weight of 33 g / m ² produced by the paper making method, the fabric produced in Production Example 1 is overlapped while being stretched 10% in the vertical direction. Water jet 3 times at a processing speed of 7 m / min and a jet pressure of 9 MPa in a water jet punching machine having a nozzle head with a nozzle diameter of 0.1 mm from the paper making web side and 0.6 mm spacing nozzle plates inserted Punch processing was performed.

  Next, the ultrafine fiber web was stacked so that the woven fabric obtained in Production Example 1 was in the center, and from the ultrafine fiber web, using the same water jet punch machine as above, at a treatment speed of 7 m / min, 17 MPa It processed 3 times with the injection pressure, and it processed 3 times similarly from the back side.

  Using the wide belt sander manufactured by Kikukawa Iron Works, the ultrafine fiber nonwoven fabric side of the laminated sheet thus obtained was buffed with silicon carbide abrasive sandpaper having a particle size of P500, and used as unconstrained fibers. Napped hair was formed. Furthermore, it dye | stained black with the disperse dye with the liquid-flow dyeing machine. Table 1 shows the results of evaluating the nonwoven fabric layer obtained here.

Next, a dimethylformamide (hereinafter, DMF) solution of polyurethane in which a black pigment was dispersed was applied to the napped surface with a gravure so that the solid content was 5 g / m ^2, and wet coagulated.

  When the cross section of the leather-like sheet thus obtained was observed with an electron microscope, it was confirmed that ultrafine fibers and urethane were mixed in the surface layer. In addition to excellent form stability, contamination of fastness to dry cleaning was grade 3.

Example 2
A leather-like sheet was obtained in the same manner as in Example 1 except that the fabric of Production Example 2 was used.

  As shown in Table 1, the evaluation results of the nonwoven fabric layer obtained here showed that the leather-like sheet of Example 1 had better bagging resistance. In Example 2, the elongation rate of the woven fabric itself was excellent, but it is estimated that the high density of the woven fabric hindered the integration with the nonwoven fabric and the elongation rate of the leather-like sheet was lowered. .

  When the cross section of the leather-like sheet thus obtained was observed with an electron microscope, it was confirmed that ultrafine fibers and urethane were mixed in the surface layer. In addition to excellent form stability, contamination of fastness to dry cleaning was grade 3.

Comparative Example 1
A web was prepared by passing sea island type composite short fibers having a single fiber fineness of 3 dtex, 36 islands, and a fiber length of 51 mm consisting of 45 parts by weight of polystyrene as a sea component and 55 parts by weight of polyethylene terephthalate as an island component through a card machine and a cross wrapper. . The obtained web was subjected to needle punching at a driving density of 2800 pieces / cm ² using a 1 barb type needle punching machine to obtain a composite short fiber nonwoven fabric having an apparent fiber density of 0.25 g / cm ³ . Next, it is immersed in an aqueous solution of 5% by weight of PVA heated to 95 ° C. and having a polymerization degree of 500 and a saponification degree of 88% for 2 minutes. At the same time as the impregnation, shrinkage treatment was performed. Thereafter, the nonwoven fabric was dried at 100 ° C. to remove moisture. Next, the composite short fiber nonwoven fabric was treated with trichlene at a liquid temperature of 30 ° C. until the polystyrene was completely removed, thereby expressing ultrafine fibers having a single fiber fineness of 0.046 dtex from the composite short fibers.

  Next, a DMF solution of polyether polyurethane was impregnated so that the solid content was 30% by weight per ultrafine fiber, and wet coagulated.

  This sheet was split in the thickness direction, and the ultrafine fiber nonwoven fabric side of the laminated sheet obtained in this way was used with a wide belt sander manufactured by Kikukawa Iron Works Co., Ltd. Was brushed. Furthermore, it dye | stained black with the disperse dye with the liquid-flow dyeing machine. Table 1 shows the results of evaluating the nonwoven fabric layer obtained here.

Next, a DMF solution of polyurethane in which a black pigment was dispersed was applied to the raised surface with a gravure so that the solid content was 5 g / m ² and wet coagulated.

  When the cross section of the leather-like sheet thus obtained was observed with an electron microscope, it was confirmed that ultrafine fibers and urethane were mixed in the surface layer. However, it was inferior in form stability, and contamination of fastness to dry cleaning was first grade.

Comparative Example 2
A web was prepared by passing a sea-island type composite short fiber having a single fiber fineness of 3 dtex and a fiber length of 51 mm through a card machine and a cross wrapper, by mixing and spinning 50 parts by weight of polyethylene as a sea component and 50 parts by weight of nylon as an island component. . The obtained web was entangled using a 1 barb type needle punch machine, and then impregnated with a DMF composition of polyether-based polyurethane so that the solid content was 60% by weight per ultrafine fiber. Solidified. Next, the polyethylene was removed by treatment with parklens, and using a wide belt sander manufactured by Kikukawa Iron Works, napping treatment was performed with sandpaper made of silicon carbide abrasive grains having a particle size of P180. Then, it dye | stained black with the acidic dye with the liquid-flow dyeing machine.

  The obtained sheet had a wide gap between the polyurethane and the ultrafine fibers and a low basis weight, and thus had a structure that was very easy to stretch. Table 1 shows the results of evaluating the nonwoven fabric layer obtained here.

Next, a DMF solution of polyurethane in which a black pigment was dispersed was applied to the raised surface with a gravure so that the solid content was 5 g / m ² and wet coagulated.

  When the cross section of the leather-like sheet thus obtained was observed with an electron microscope, it was confirmed that ultrafine fibers and urethane were mixed in the surface layer. Also, the fastness to dry cleaning was grade 3. However, it was inferior in form stability and easily deformed.

Comparative Example 3
A leather-like sheet was obtained in the same manner as in Example 1 except that buffing was not performed. Since the obtained leather-like sheet was a mixed layer composed of entangled fibers and a polymer elastic body, the texture was very hard. Further, since the polymer elastic body hardly permeates, a layer composed only of the polymer elastic body was formed on the surface layer, and it was easily peeled off.

Claims (7)

0.0001 entangled ultrafine fibers mutual dtex, and a non-woven fabric layer having a substantially non-woven fabric made of a fiber material, a mixture layer unconstrained ultrafine fibers elastic polymer is applied The leather-like sheet is characterized in that the unconstrained ultrafine fibers are continuous with the fibers constituting the nonwoven fabric . The leather-like sheet according to claim 1, wherein the nonwoven fabric layer is formed by laminating a nonwoven fabric and a woven or knitted fabric. The leather-like sheet according to claim 1 or 2, wherein the sheet surface has a silver surface. The leather according to any one of claims 1 to 3, wherein the nonwoven fabric layer has a bagging resistance value obtained by JIS L 1061 (1987) B-1 method (constant load method) of 4 to 8 mm. Like sheet. The leather according to any one of claims 1 to 4, wherein the non-woven fabric layer has a bagging resistance value obtained by JIS L 1061 (1987) B-2 method (constant elongation method) of 4 to 8 mm. Like sheet. 6. The polyester according to claim 1, wherein the fibers constituting the nonwoven fabric layer are dyed, and the contamination of the dry-cleaning fastness of the leather-like sheet is grade 3 or higher. The leather-like sheet of description. A method for producing a leather-like sheet, wherein the leather-like sheet according to claim 1 is produced by the following steps.
A. Step of entanglement of ultrafine fiber-generating fibers having a single fiber fineness of 1 to 10 dtex, which can generate ultrafine fibers having a single fiber fineness of 0.0001 to 0.5 dtex, with a needle punch B. Step of generating ultrafine fiber nonwoven fabric layer by generating high-velocity fiber of 0.0001 to 0.5 dtex and then performing high-speed fluid treatment at a jet pressure of 10 MPa or more. B. buffing the nonwoven fabric in the ultrafine fiber nonwoven fabric layer Step of dyeing the ultrafine fiber nonwoven fabric layer A process of applying a polymer elastic body to the sheet surface to form a mixed layer of unconstrained ultrafine fibers and a polymer elastic body