JP2003171883A - Suede tone leather like sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suede tone leather like sheet having a writing (a handwriting effect), high quality appearance and touch, and also a sufficient strength jointly, and useful for using by dyeing with a dark color such as black. <P>SOLUTION: This suede tone leather like sheet is characterized by laminating (A) a layer consisting of very fine fibers (a) of ≤0.01 decitex, mass-dyed with ≥3 pts.wt. carbon black based on 100 pts.wt. resin component constituting the very fine fibers with (B) a layer consisting of very fine fibers (a) of ≤0.01 decitex, mass-dyed with <3 pts.wt. carbon black based on 100 pts.wt. resin component constituting the very fine fibers or not mass dyed-very fine fiber (b) in a weight ratio of (a)/(b)=(10/90)-(90/10) range, incorporating elastic fibers in an interlaced nonwoven fabric made as one unit and covering the surface of the (A) layer side with raised standing hairs. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like leather-like sheet which has a writing (handwriting effect), has a high-grade appearance and touch, and is used by being dyed in a dark color such as black.

[0002]

2. Description of the Related Art Suede-like leather-like sheets are currently used in various applications, but suede-like leather-like sheets that are dyed in dark colors in particular have the following characteristics from the technical background. It was Suede-like leather-like sheet with a high-quality appearance similar to natural leather A fine fiber with a fiber diameter similar to collagen fibers that make up natural leather provides a high-quality appearance, but because the fiber diameter is thin, it can be pulled The tearing property is deteriorated, and the coloring caused by dyeing is diffused due to the diffuse reflection of light, resulting in a dull color and a dark color is difficult to appear. Suede-like leather-like sheet in which a dark color is obtained In order to obtain a dark color, by using a fiber having a large fiber diameter in order to increase the color developability of the constituent fibers, it is possible to obtain sufficient tensile and tear physical properties, It has a hard texture, a rough appearance, and tends to lack a high-class feel.

[0003]

Means for Solving the Problems The present inventors have found a suede-like leather-like sheet which has a high-class appearance and a fullness similar to that of natural leather, and has sufficient physical properties as a leather-like sheet and a sufficient dark color. As a result of earnest studies, it is possible to achieve the object by laminating carbon black-adhered ultrafine fibers for achieving a high-quality appearance and dark color and ultrafine fibers with a low carbon adhering amount for obtaining sufficient physical properties. And completed the present invention. That is, the present invention is 0.0
A layer (A) consisting of ultrafine fibers (a) having a particle size of 1 decitex or less and having 3 parts by weight or more of carbon black for 100 parts by weight of the resin component constituting the ultrafine fibers.
And a layer made of ultrafine fibers (b) which is 0.1 decitex or less and which is or is not raw-coated with carbon black in an amount of less than 3 parts by weight with respect to 100 parts by weight of a resin component constituting the ultrafine fibers. (B) is the weight ratio (a) /
(B) = 10/90 to 90/10, the elastic polymer is contained in the entangled and integrated nonwoven fabric laminated in the range of
Further, the suede-like leather-like sheet is characterized in that the surface on the (A) layer side is covered with raised naps.
Further, the fineness of the ultrafine fibers (b) is preferably thicker than that of the ultrafine fibers (a). Further, the ratio of the carbon part (Ca) by which the ultrafine fiber (a) is deposited and the carbon part (Cb) by which the ultrafine fiber (b) is deposited is Cb / Ca = 0.
It is preferably ˜0.5.

The present invention will be described in detail below. The suede-like leather-like sheet that constitutes the present invention comprises ultrafine fibers (a) having a content of 0.01 decitex or less, and 3 parts by weight or more of carbon black per 100 parts by weight of the resin component constituting the ultrafine fibers. ) And less than 0.1 decitex and less than 3 parts by weight of the ultrafine fibers (b) which have been or have not been dyed with carbon black based on 100 parts by weight of the resin component constituting the ultrafine fibers. It consists of entangled and integrated nonwoven fabric and elastic polymer impregnated and solidified into it. Hereinafter, the nonwoven fabric impregnated with the elastic polymer and solidified is simply referred to as a sheet. The fineness of the ultrafine fibers (a) constituting the leather-like sheet needs to be 0.01 decitex or less, and preferably 0.005 to 0.0001.
It is the range of decitex. If it exceeds 0.01 decitex, the napped surface feels rough, a fine texture cannot be obtained, and the high-grade appearance is deteriorated.
If it is less than 0.0001 decitex, the color developability after dyeing tends to be further lowered, and a sufficient dark color may not be obtained. The fineness of the ultrafine fibers (b) is 0.
It should be 1 decitex or less, and preferably,
The fineness is in the range of 0.1 to 0.001 decitex.
If it exceeds 0.1 decitex, it will become entangled, which will cause
That is, due to the fibers pushed up into the layer made of the ultrafine fibers (a), the appearance is deteriorated, and if it is less than 0.001 decitex, sufficient physical properties of the leather-like sheet may not be obtained. Further, the ultrafine fibers (a) and the ultrafine fibers (b) are
The fiber diameters may be the same as long as each is 0.01 decitex or less. The fineness referred to in the present invention is an average fineness, and as will be described later, it is obtained from the average diameter of the fibers observed from an electron micrograph in the state where the ultrafine fiber-generating fibers are changed to the ultrafine fibers.

As a method for producing ultrafine fibers, cross-sections are obtained by a spinning method such as a mixed spinning method or a composite spinning method using two or more kinds of polymers having no compatibility and different solubility or degradability. Obtaining ultrafine fiber-generating fibers with a sea-island structure or a dividable laminating structure, extracting or decomposing and removing part of the fibers (eg, sea components), and exfoliating the laminating part to produce ultrafine fibers Or a method of making a fiber fine by blowing out with a high-speed gas immediately after discharging the fiber-forming polymer from the melt spinning nozzle, a so-called melt blow method, or the like, a known ultrafine fiber manufacturing method can be used.
From the viewpoint of controlling the fiber thickness and the stability of the ultrafine fibers, the method of passing through the ultrafine fiber-generating fibers is preferable.

The resin constituting the ultrafine fibers is not particularly limited, but it is polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and aromatic polyesters such as copolymerized polyesters mainly containing these, and nylon. Polymers selected from known resins such as polyamides such as -6, nylon-66 and nylon-610, and polyolefins represented by polyethylene, polypropylene and the like can be mentioned.
Among them, the aromatic polyesters and polyamides are preferable in that natural leather-like artificial leather can be obtained and dyeability is excellent.

Carbon black is added to these resins to the extent that the stability during spinning is not impaired. The ultrafine fibers (a) constituting the present invention are characterized by having 3 parts by weight or more of carbon black with respect to 100 parts by weight of the resin constituting the fibers. The amount of carbon black is preferably used in the range of 3 to 15 parts by weight,
It is more preferably used in the range of 4 to 10 parts by weight. 1
If it exceeds 5 parts by weight, for example, the ultrafine fibers of the island component obtained by mixed spinning tend to be brittle, and the strength of the leather-like sheet obtained tends to decrease. When the amount is less than 3 parts by weight, the blackness of the obtained fiber is low, and when the ultrafine fiber satisfying the conditions of the present invention is used, it is difficult to obtain a sufficiently dark color.

On the other hand, the ultrafine fibers (b) constituting the present invention
Has less than 3 parts by weight of carbon black with respect to 100 parts by weight of the resin constituting the fiber. Further, it is preferably 2 parts by weight or less. If the amount is 3 parts by weight or more, a suede-like leather-like sheet having sufficient strength cannot be obtained when the structure of the present invention is used. More preferably, the ratio of the carbon part (Ca) for depositing the ultrafine fiber (a) to the carbon part (Cb) for depositing the ultrafine fiber (b) is Cb.
/ Ca = 0 to 0.5, most preferably 0 to 0.
It is 3. As a result, it is possible to obtain a suede-like leather-like sheet that has both a darkness on the surface and high strength and is flexible and hard to stretch due to its structure that closely resembles natural leather and has an excellent fulfillment feeling. Here, the reason why the strength of the suede-like leather-like sheet is improved by laminating the layer (B) composed of the ultrafine fibers (b) will be described below. When the number of parts by weight of carbon black is increased to obtain a dark color, the melt viscosity of the resin containing it increases. In particular, in the case of a method in which the number of islands, that is, the fiber diameter, is determined by the melt viscosity ratio of the resin that becomes the island component and the resin that becomes the sea component, such as the mixed spinning method, in order to obtain the blackness. In addition, when the amount of carbon black added is increased, it is necessary to reduce the degree of polymerization of the resin that constitutes the fiber to lower the melt viscosity in order to keep the melt viscosity of the carbon black-blended resin constant. According to this method, since the polymerization degree of the resin is lowered, the strength of the fiber becomes low. As described above, in order to obtain a suede-like leather-like sheet made of ultrafine fibers having a dark color and high quality, it is necessary to sacrifice the strength. In the ultrafine fiber (b) of the present invention, by reducing the addition amount of carbon black, it is not necessary to lower the melt viscosity until the strength of the fiber becomes low even if the degree of polymerization of the resin constituting the fiber is increased. By further using a fiber having a relatively large fiber diameter as the ultrafine fiber (b) of the present invention, a further improvement in fiber strength can be achieved.

Next, examples of the resin component that is extracted and removed or decomposed and removed that constitutes the ultrafine fiber-generating fiber include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, polystyrene,
At least one polymer selected from polymers such as styrene-acrylic monomer copolymers, styrene-ethylene copolymers, and copolyesters can be used. Among them, polyethylene, polystyrene, copolymers containing these as a main component, and the like are preferable in terms of easy extraction.

Next, a method for forming a base material using the above ultrafine fibers or ultrafine fiber generating fibers will be described. As a method for forming a non-woven fabric, a known method, for example, a step of producing an entangled non-woven fabric composed of ultrafine fiber-generating fibers, a step of impregnating and coagulating the entangled non-woven fabric with an elastic polymer solution,
This can be achieved by sequentially performing a step of modifying the ultrafine fiber-generating fiber into an ultrafine fiber. Of course, the step of modifying to ultrafine fibers and the step of impregnating and solidifying the elastic polymer may be reversed.

As a method for producing an entangled nonwoven fabric using ultrafine fiber-generating fibers, the ultrafine fiber-generating fibers are subjected to treatments such as spinning, drawing, heat treatment, crimping and cutting by a conventionally known method. A raw cotton of the same fiber is produced, and the raw cotton is defibrated with a card and formed into a random web or a cross wrap web with a weber.

At this time, a fiber layer made of ultrafine fiber-generating fibers to form the ultrafine fibers (a) and a fiber layer made of ultrafine fiber-forming fibers to form the ultrafine fibers (b) are formed. Laminated, but using the web as a fiber layer,
Laminate the webs to the desired weight. The lamination weight ratio of the web composed of the fibers which will form the ultrafine fibers (a) and the web composed of the fibers which will form the ultrafine fibers (b) is such that the ultrafine fibers (a) and the ultrafine fibers (b) are formed. After (a) / (b) = 90/10 to 10/90
And preferably (a) / (b) = 15 / 85-5
Laminate so that the ratio becomes 0/50. The weight ratio of (a) is 10
When it is less than%, the layer (A) made of the ultrafine fibers (a) becomes thin, and a large amount of the ultrafine fibers (b) appears on the surface during entanglement, so that the ultrafine fibers (a) and (b) This causes problems such as unevenness of the surface color and deterioration of the external appearance due to the mixture of. On the other hand, when the weight ratio of (a) exceeds 90%, the effect of improving the strength by the fiber layer (B) is weakened and sufficient strength cannot be obtained. More preferably, the ratio of the carbon part (Ca) for depositing the ultrafine fiber (a) and the carbon part (Cb) for depositing the ultrafine fiber (b) is in the range of Cb / Ca = 0 to 0.5. , (A) / (b) = 15/85 to 50/50, the suede-like leather-like sheet of the present invention has a texture similar to natural leather, a well-balanced fullness, color-forming property, and strength. It becomes possible.

After laminating a fiber layer composed of ultrafine fiber-generating fibers to form the ultrafine fibers (a) and a fiber layer composed of ultrafine fiber-forming fibers to form the ultrafine fibers (b), The weight of the fiber per unit width of the laminate is appropriately selected according to the intended final application field and is generally preferably in the range of 100 to 3000 g / m ² . For the purpose of cost reduction, the nonwoven fabric of about twice the required weight is impregnated with the elastic polymer solution and coagulated, and then divided in the thickness direction with a band knife or the like to efficiently perform 2 times at a time. It is also possible to manufacture a single substrate. In this case, (a) / (b) / (a) and (b) / (a) /
There are two possible stacking methods of (b). There is no particular limitation, but when performing the entanglement treatment by the needle punching method, the laminated (a) / (b) / (a) is easier to obtain a finer napped surface, and the obtained suede-like leather It is preferably used because the sheet has a density gradient structure in the thickness direction and has a texture closer to that of natural leather.

After laminating the webs, an entangled nonwoven fabric is formed by performing an entanglement treatment using a known means, for example, a needle punching method. The number of needle punching and the needle punching conditions vary depending on the shape of the needle used and the thickness of the web, but generally 200 to 2500 punches / cm ^2.
It is better to set within the range.

The entangled nonwoven fabric may be subjected to a surface smoothing treatment by a known method such as hot pressing, if necessary, prior to the elastic polymer-containing treatment. When the fiber constituting the entangled nonwoven fabric is a sea-island type ultrafine fiber-generating fiber having polyethylene as a sea component and polyester or polyamide as an ultrafine island component, for example, the polyethylene of the sea component is melted by hot pressing, It is particularly preferable because the entangled nonwoven fabric having extremely excellent surface smoothness can be obtained by fusing the fibers together. When the fibers constituting the entangled non-woven fabric are not multi-component fibers capable of dissolving and removing one component to be modified into ultrafine fibers, prevent the elastic polymer to be contained from sticking to the fibers and making the texture harder. In order to do so, it is preferable that the fiber surface is covered with a temporary filling substance such as polyvinyl alcohol before the impregnation treatment, and the temporary filling substance is removed after applying the elastic polymer. Further, even when the ultrafine step is performed before or after the elastic polymer impregnation / coagulation step, a more flexible sheet can be obtained by applying the temporary filling substance at the stage of the entangled nonwoven fabric before the ultrafine step. .

As the elastic polymer to be contained in the entangled nonwoven fabric, a known one can be used, but a polyurethane resin is preferably used from the viewpoint of texture. The preferred polyurethane resin is selected from the group consisting of polyester-based diols, polylactone-based diols, polycarbonate-based diols, polyether-based diols, etc. obtained by reacting a diol with a dicarboxylic acid or its ester-forming derivative as a soft segment. Further, there is a so-called segmented polyurethane obtained by using at least one kind of polymer diol having a number average molecular weight of 500 to 5,000, and reacting this with a diisocyanate compound and a low molecular chain extender.

The diol compound constituting the soft segment is preferably a compound having 6 to 10 carbon atoms from the viewpoint of durability or leather-like texture.
Examples thereof include 3-methyl-1,5-pentanediol, 1,6-hexanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, and 1,10-decanediol. Representative examples of the dicarboxylic acid include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, azelaic acid and sebacic acid, and aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid.

The number average molecular weight of the polymer diol is 500.
If it is less than the above range, flexibility is lacking and a natural leather-like texture cannot be obtained, which is not preferable. When the number average molecular weight of the polymer diol exceeds 5,000, the concentration of urethane groups decreases, and it is difficult to obtain a polymer diol having a well-balanced flexibility, durability, heat resistance and hydrolysis resistance.
Examples of the diisocyanate compound include diphenylmethane-4,4′-diisocyanate, tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane-4,
4'-diisocyanate and the like can be mentioned. Examples of the low molecular chain extender include ethylene glycol, propylene glycol, butanediol, hexanediol,
Examples thereof include low molecular weight compounds having two active hydrogen atoms having a molecular weight of 300 or less, such as N-methyldiethanolamine and ethylenediamine. If necessary, a coagulation regulator, a stabilizer and the like may be added to the elastic polymer, and two or more kinds of polymers may be used in combination. Further, a coloring agent such as carbon black may be added.

The method of incorporating the elastic polymer in the entangled nonwoven fabric is not particularly limited, but from the viewpoint of the balance of the texture, the entangled nonwoven fabric is directly impregnated with the elastic polymer solution and, if necessary, squeezed with a mangle. Alternatively, a method in which the elastic polymer solution is soaked while being coated with a coater is preferable. From the viewpoint of soft texture like natural leather, the weight ratio of the fibers constituting the non-woven fabric (fibers after ultrafine fiberizing treatment in the case of ultrafine fiber generation type fibers) to the elastic polymer is 20/80 to 95. / 5 is preferable, and more preferably 25/75 to 90/10. If the ratio of the fibers is too low, the leather-like sheet will have a rubber-like texture, which is not preferable, and if the ratio of fibers is too high, the texture will be paper-like, and the desired natural leather-like texture cannot be obtained.

After containing the elastic polymer in the entangled nonwoven fabric, in the case of the elastic polymer and the sea-island type ultrafine fiber-generating fiber, it is a non-solvent for the island component of the ultrafine fiber-generating fiber and the sea component. On the other hand, by treating with a solvent or a liquid acting as a decomposing agent, the ultrafine fiber-generating fiber is modified into an ultrafine fiber bundle, and a sheet composed of an ultrafine fiber entangled nonwoven fabric and an elastic polymer is obtained. Needless to say, a sheet may be formed by a method of modifying the ultrafine fiber-generating fiber into an ultrafine fiber bundle prior to containing the elastic polymer. The thickness of the sheet thus obtained is not particularly limited, but is usually in the range of 0.5 to 3.0 mm in many cases. This is due to the convenience of the production line,
If it is less than 0.5 mm, problems such as difficulty in design may occur due to elongation in the intermediate process, and if it exceeds 3.0 mm, problems such as difficulty in entanglement of nonwoven fabric and difficulty in impregnation with elastic polymer may occur. May occur. The unit weight is one
There is no limitation as it is determined by the design of the sheet, such as the double-picking. The specific gravity is also not particularly limited, but it is preferably 0.3 to 0.7 g / cm ³ . If it is less than 0.3 g / cm ³ , the strength of the sheet tends to be insufficient, and if it exceeds 0.7 g / cm ³ , the texture tends to be hard. "Light" that has been generally recognized as leather
It tends to be difficult to express that feature.

The surface raising of the obtained sheet of the entangled nonwoven fabric of ultrafine fibers and the elastic polymer can be carried out by a known method such as buffing or styling. The length of fluff that is raised affects the appearance such as touch and gloss, so the conditions for buffing and bristling, for example, the count of sandpaper used for buffing, the speed of shaving,
A desired fluff length can be obtained by adjusting the pressing pressure and the like.

The suede leather-like sheet thus obtained is dyed by a known method. Due to the effect of carbon black, the napped suede surface can effectively obtain a dark color without damaging the texture with a small amount of dye, and has a high-grade appearance due to the lighting effect made of ultrafine fibers. In addition, the layer of fibers forming the back side, which contains little or no carbon black, provides suede-like artificial leather having sufficient strength. The artificial leather thus obtained is suitably used not only as a material for clothing but also as a material for sports gloves which requires mechanical strength.

[0023]

EXAMPLES The present invention will now be described with reference to specific examples, but the present invention is not limited to these examples. The parts in the examples relate to weight unless otherwise specified. The strength and elongation are measured according to JIS L-1096, and the proceeding direction during production of the base material is the longitudinal direction, and the direction perpendicular thereto is the transverse direction. In terms of thickness, JIS L-
240 g / c measured by the method shown in 1096
It is the thickness under m ² load. Further, the touch, texture and appearance (lighting, blackness, density difference between front and back surfaces) were judged by the inventors by taking into consideration the touch and gloss, and expressed as good: ◯, normal: Δ, poor: ×. .

Fiber production example Nylon-6 and polyethylene in a chip state of 50: 5
Carbon black mixed with a weight ratio of 0 and melt-spun by an extruder to give polyethylene a relative viscosity of 3.2 and 2.1, and nylon kneaded into the nylon when spinning a sea-island cross-section spun fiber of sea component. (Hereinafter CB) is nylon 1
4 parts by weight (hereinafter referred to as d
a short fiber with a length of 51 mm was produced. The produced short fibers are referred to as fiber A, fiber B, fiber C, and fiber D, respectively. The cross section of an arbitrary fiber bundle after the sea component of the obtained fiber was dissolved and removed to form an ultrafine fiber was observed with an electron micrograph magnified 200 times, and calculated from the average diameter of the island component. The results are shown in Table 1. The average fineness of the fibers A, B, C and D is 0.003 dtex, 0.
004 dtex, 0.080 dtex and 0.095
It was dtex.

[0025]

[Table 1]

Example 1 The short fibers consisting of the fibers B and A obtained in the above fiber production example were defibrated with a card and made into a web with a webber, and B / A / B was used.
After being laminated at a weight ratio of = 25/50/25, a entangled nonwoven fabric was obtained by performing needle punching at 700 punch / cm ² using a needle punching machine. This fibrous sheet was impregnated with a solution of poly-3-methylpentane adipate / polyethylene glycol copolymer polyurethane resin in dimethylformamide, and after wet coagulation, polyethylene, which is a sea component of the fiber, was extracted with toluene at 80 ° C. Four
A sheet of 20 g / m ² , a thickness of 1.1 mm, and a ratio of polyurethane resin to fibers of 30/70 was obtained. The obtained sheet is sliced in two in the thickness direction, and the sliced surface is buffed with sandpaper to adjust the thickness to 0.5 mm.
The surface made of the fibers B was buffed to obtain a sheet 1 having a raised surface made of the nylon ultrafine fibers. Furthermore, as a result of slicing into two in the thickness direction and measuring the specific gravity of each, the specific gravity of the one mainly composed of the fiber B is 0.40.
At 1 g / cm ³ , the sheet mainly composed of the fiber D had a specific gravity of 0.359 g / cm ³ , and a sheet having a specific gravity gradient was obtained. The sheet 1 thus obtained was subjected to a Wins dyeing machine to obtain a black metal-containing complex salt dye (IRGARAN BLACK GL).
Was dyed at 90 ° C. for 1 hour under the condition that owf was 3%. The obtained suede-like leather-like sheet had a sufficient degree of blackness, the density of the front surface was higher than that of the back surface, and the color tone was natural. In addition, due to the fine-grained lighting effect, it had a high-class appearance, touch, and a rich texture. The results are shown in Table 2.

Example 2 Using the fibers B and C obtained in the fiber production example, B / C =
A unit weight of 189 g / m ² , a thickness of 0.5 mm, and the same method as in Example 1 except that the layers were laminated at a weight ratio of 30/70.
A sheet having a polyurethane resin / fiber ratio of 30/70 was obtained. Further, the surface made of the fibers B was buffed to obtain a napped sheet 2. Furthermore, when the specific gravity was measured by slicing into two in the thickness direction, the specific gravity of the one mainly composed of the fiber B was 0.395 g / cm ³ , and the specific gravity of the one mainly composed of the fiber C was measured. Is 0.370 g / cm ³
Met. The obtained sheet 2 was dyed to obtain a suede-like leather-like sheet. The obtained leather-like sheet had a sufficient degree of blackness, the surface density was higher than that of the back surface, and the color tone was natural. In addition, it had a high-class appearance due to fine-grained lighting effects, a touch, and a rich texture. The results are shown in Table 2.

Example 3 Using the fibers B and C obtained in the fiber production example, B / C /
B = 25/50/25, except that the layers were laminated in the same manner as in Example 1, but with a basis weight of 424 g / m ² and a thickness of 1.
A sheet having a size of 1 mm and a polyurethane resin / fiber ratio of 30/70 was obtained. The obtained sheet was sliced in two in the thickness direction, the sliced surface was buffed with sandpaper to adjust the thickness to 0.5 mm, and the surface made of the fiber B was buffed to make the nylon ultrafine fiber. A sheet 3 having a napped surface was obtained. Further, as a result of slicing into two in the thickness direction and measuring the respective specific gravities, the specific gravity of the one mainly composed of the fiber B is 0.393 g / cm ³ , and the specific gravity of the one mainly composed of the fiber C. Is 0.375 g / cm ³
Met. The obtained sheet 3 was dyed under the same conditions as in Example 1 to obtain a suede-like leather-like sheet. The obtained suede-like leather-like sheet had a sufficient degree of blackness, the density of the front surface was higher than that of the back surface, and the color tone was natural. Also,
It had a high-class appearance, touch, and a rich texture due to the fine-grained lighting effect. The results are shown in Table 2.

Comparative Example 1 The same procedure as in Example 1 was carried out except that only the fiber A obtained in the fiber production example was used, and the basis weight was 175 g / m ² , the thickness was 0.5 mm, and the ratio of the polyurethane resin to the fiber was 1. 30/7
I got 0 sheets. The surface of the obtained sheet was raised by buffing to obtain a napped sheet 4, and then dyed to obtain a suede-like leather-like sheet. The obtained leather-like sheet has low blackness,
It was a dark gray. The color density was the same on both the front and back sides. It also had a high-class appearance and touch due to its fine-grained lighting effect. The results are shown in Table 2.

Comparative Example 2 Using the fibers B and D obtained in the fiber production example, B / D =
A unit weight of 184 g / m ² , a thickness of 0.5 mm, and the same method as in Example 1 except that the layers were laminated at a weight ratio of 50/50.
A sheet having a polyurethane resin / fiber ratio of 35/65 was obtained. A napped sheet 5 was obtained by buffing the surface of the obtained sheet made of fibers B. Furthermore, as a result of slicing into two in the thickness direction and measuring the specific gravity of each, the specific gravity of the one mainly composed of the fiber B is 0.389 g / cm ³ ,
The specific gravity of the one mainly composed of fiber D is 0.345 g
It was / cm ^3. The obtained sheet 5 was then dyed to obtain a suede-like leather-like sheet. The obtained leather-like sheet had a sufficient degree of blackness, but the back side had a higher degree of blackness and had an unnatural hue. In addition, although it had a high-class appearance due to a fine-grained lighting effect, a touch, and a full-feeling texture, its strength was low. The results are shown in Table 2.

Comparative Example 3 Using the fibers C and D obtained in the fiber production example, D / C =
A unit weight of 193 g / m ² and a thickness of 0.5 mm were obtained in the same manner as in Example 1 except that the layers were laminated at a weight ratio of 50/50.
A sheet having a polyurethane resin / fiber ratio of 30/70 was obtained. A napped sheet 6 was obtained by buffing the surface of the obtained sheet made of fibers D. Furthermore, as a result of slicing into two in the thickness direction and measuring the specific gravity of each, the specific gravity of the one mainly composed of the fiber D is 0.403 g / cm ³ ,
The specific gravity of the one mainly composed of fiber C is 0.367 g
It was / cm ^3. The obtained sheet 6 was then dyed to obtain a suede-like leather-like sheet. The obtained leather-like sheet had a sufficient degree of blackness, the surface density was higher than that of the back surface, and the color tone was natural. However, the appearance,
The texture was rough with the touch, and a high-class feeling was not obtained. The results are shown in Table 2.

[0032]

[Table 2]

[0033]

According to the present invention, a dark color can be obtained even with a relatively small amount of dye, it has a writing (handwriting effect), has a high-class appearance and touch, and has a soft texture and stretch-preventing effect similar to natural leather. A suede-like leather-like sheet having the above properties can be obtained.

Claims (3)

[Claims] 1. A layer (A) consisting of ultrafine fibers (a) which is 0.01 decitex or less and which is originally deposited with 3 parts by weight or more of carbon black per 100 parts by weight of a resin component constituting the ultrafine fibers. And less than 0.1 decitex and less than 3 parts by weight of carbon fiber to 100 parts by weight of the resin component constituting the ultrafine fiber, which are or are not undyed with the carbon black. The layer (B) has a weight ratio (a) / (b) = 10/90 to 90 /.
A suede leather which is laminated in the range of 10 and contains an elastic polymer in the entangled and integrated nonwoven fabric, and the surface of the (A) layer side is covered with raised naps. Like sheet. 2. The fineness of the ultrafine fiber (b) is that of the ultrafine fiber (a).
The suede-like leather-like sheet according to claim 1, which is a thicker fiber. 3. The ratio of carbon by weight (Ca) for depositing ultrafine fibers (a) to carbon by weight (Cb) for depositing ultrafine fibers (b) is Cb / Ca = 0 to 0.5. A suede-like leather-like sheet according to claim 1 or 2.