JPH07173778A - Suede-tone artificial leather - Google Patents

Abstract

PURPOSE:To obtain a suede-tone artificial leather having excellent appearance and handle and improved coloring properties and pilling resistance. CONSTITUTION:In this suede-tone artificial leather which comprises a yarn bundle and an elastic material and has napped colored fibers on the surface, the yarn bundle is composed of thin yarns (A) having 0.02-0.2 denier and ultrafine yarns (B) which have an average fineness <=1/5 that of the thin yarns (A) and <0.02 denier fineness, the thin yarns and the ultrafine yarns are uniformly mixed and dispersed in the cross section of the yarn bundle, the ratio of the number of the yarns (A/B) is 2/1-2/3, the elastic polymer is not substantially contained in the interior of the yarn bundle and the ratio of the number of the yarns (A/B) constituting the napped fibers is >=3/1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like artificial leather having a good appearance and excellent color developability, texture and pilling resistance, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a suede-like artificial leather is known in which naps made of fiber bundles are present on the surface of a base made of fiber bundles and an elastic polymer. In this way, in the field of suede-like artificial leather, high quality is required, and all aspects of appearance (suede feel), texture (flexible touch), color development, and physical properties such as pilling resistance are all required. There is a demand for satisfying high quality products. Specifically, in order to obtain a suede-like artificial leather with an excellent appearance, a method of making the fibers constituting the artificial leather extremely thin is generally used, but when the fibers are made extremely thin, it becomes dull. It has a defect that it can be dyed only in a whitish color, a product having a vivid color cannot be obtained, and the coloring property is inferior. Further, in order to make the texture (touch) of the artificial leather extremely soft and good, it is carried out so that the elastic polymer is not substantially present inside the fiber bundle constituting the artificial leather. However, if there is no elastic polymer inside the fiber bundle,
A problem arises that the napped fibers are easily pulled out and so-called pilling resistance deteriorates.

In order to improve the color developability of such a fiber napped suede-like artificial leather, Japanese Patent Publication No. 55-506 discloses that a dyeable resin is applied to the surface of the fiber napped sheet for dyeing. Further, a dyeing method of dyeing with a dye which becomes water-soluble by being reduced in the presence of an alkali and oxidizing and fixing the dye has been proposed in JP-B-61-25834 and JP-B-61-46592. Further, in order to improve the pilling resistance of the fiber napped suede-like artificial leather, a method of dissolving a part of the polymer at the root of the napped fiber with a solvent of the polymer and fixing the root of the napped fiber on the surface is disclosed in Japanese Patent Laid-Open No. No. 57-154468.

Further, as an ultrafine fiber bundle in which ultrafine fibers having different finenesses are mixed, in the mixed spun fiber, the distribution of the size of the island component is within a quarter of the radius from the outer periphery, and the fineness DS of the island component, A fiber structure in which the fineness DC of the island component existing within 2/3 of the radius from the center satisfies DC ≧ 1.5DS is disclosed in JP-A-63-243314, and polyurethane is provided inside a bundle of ultrafine fiber bundle fibers. And a microfiber sheet having an average diameter of 1.0 μm or less and an aspect ratio of 500 to 2200 dispersed in and around the bundle is disclosed in JP-A-3-260150.
In the publication, as the island component, 0.02-0.2 denier fine fibers (A) and 0.001-0.01 denier ultrafine fibers (B) are contained in a weight ratio of 30 / 70-. A polyamide ultrafine fiber-generating fiber mixed and dispersed at a ratio of 70/30 and a suede-like artificial leather obtained from this fiber are disclosed in Japanese Patent Laid-Open No. 5-1.
Each is described in Japanese Patent No. 56579.

[0005]

However, the method for improving the color developability as described in JP-B-55-506, JP-B-61-25834, and JP-A-61-46592 is not suitable for color development. Although it can be improved itself,
The appearance, touch and feel of the fiber nap surface were deteriorated. Further, the technique disclosed in Japanese Patent Laid-Open No. 63-243314 has the appearance that ultrafine fibers of different thickness are localized, and the fineness difference of the island component ultrafine fibers cannot be increased depending on the method. It was difficult to achieve both the color development and the color development. The technique described in JP-A-5-156579 has a slight improvement in color developability as compared with the technique described in JP-A-63-243314, but the ratio of ultrafine fibers (B) having a small fineness. However, since the napped surface has a large number of ultrafine fibers, the color development is still insufficient. Even with this technique, it is possible to selectively cut and remove the ultrafine fibers on the napped surface by adopting harsh conditions as a condition for raising the napped surface, but under such harsh conditions. If adopted, the fine fibers (A) are also damaged and cut at the same time, so that a suede-like artificial leather having a good appearance cannot be obtained. In addition, JP-A-5
In the method described in Japanese Patent Publication No. 7-154468, since polyurethane is present inside the ultrafine fiber bundle, it is unavoidable that the texture becomes hard. It is an object of the present invention to provide a suede-like artificial leather which has a good appearance and texture, and which is excellent in color development and pilling resistance, and a method for producing the same.

[0006]

The present invention provides a suede-like artificial leather in which fiber naps are present and dyed on the surface of a substrate composed of a fiber bundle and an elastic polymer. Fine fiber (A) having a fiber bundle of 0.02 to 0.2 denier, and an ultrafine fiber (B) having a fineness of 1/5 or less of the average fiber degree of the fine fiber (A) and less than 0.02 denier.
And the ratio of the number of A and the number of B (A / B) is 2 /
The ratio of the number of A and the number of B in the napped fibers is 1 to 2/3 and the elastic polymer is not substantially contained in the fiber bundle, and when the napped surface is viewed from above. (A / B) is 3/1 or more, which is a suede-like artificial leather.

The suede-like artificial leather of the present invention is, for example,
The following steps (a) to (f) (a) in the sea component polymer that can be dissolved or decomposed and removed, the average fineness as an island component is 0.02 to 0.2 denier.
Fine fibers (A) and ultrafine fibers (B) having a fineness of less than 1/5 of the average fineness of the fine fibers (A) and less than 0.02 denier.
And are preferably almost uniformly mixed and dispersed in the fiber cross section, and the ratio (A / B) of the numbers is 2/1 to 2/3.
A process for producing fine fibers and ultrafine fiber-generating fibers [hereinafter referred to as ultrafine fiber-generating fibers or fibers (C)] that can be transformed into a bundle of fine fibers (A) and ultrafine fibers (B) , (B) a step of producing an entangled nonwoven fabric made of the fiber (C), (c) a step of impregnating the entangled nonwoven fabric with an elastic polymer liquid and wet coagulation, (d) a fine fiber of the fiber (C) It can be obtained by sequentially performing the step of converting into a fiber bundle composed of ultrafine fibers, (e) the step of forming naps on at least one surface, and (f) the step of dyeing the obtained fiber napped sheet.

In the ultrafine fiber-generating fiber (C) of the present invention, the polymer constituting the island component, that is, the fine fiber (A)
Examples of the polymer constituting the ultrafine fibers (B) include melt-spinnable polyamides such as 6-nylon and 66-nylon, and polyethylene terephthalate.
And at least one polymer selected from melt-spinnable polyesters such as polybutylene terephthalate, cationic dyeable modified polyethylene terephthalate, and the like. The fine fibers (A) and the ultrafine fibers (B) may be the same polymer or different polymers.

On the other hand, the polymer constituting the sea component has a different solubility or degradability with respect to the island component and the solvent or the decomposing agent (the polymer constituting the sea component is more soluble or degradable), Polymers with a low affinity for the components and a melt viscosity lower than the melt viscosity of the island component under spinning conditions, or a polymer with a low surface tension
And selected from easily soluble polymers such as polyethylene, polystyrene, modified polystyrene, and ethylene-propylene copolymer, and easily degradable polymers such as polyethylene terephthalate modified with sodium sulfoisophthalate or polyethylene glycol. It is at least one type of polymer.

The attached drawing is a schematic cross-sectional view of an ultrafine fiber-generating fiber (C). As shown in the drawing, the ultrafine fiber-generating fiber (C) is contained in the sea component polymer (1),
The island component includes two groups of fine fibers (A) having a large average fineness and ultrafine fibers (B) having a small average fineness,
The fine fibers (A) and the ultrafine fibers (B) are preferably in a state where they are substantially uniformly dispersed over the entire cross section in the cross section of the fiber, preferably without being locally unevenly distributed. That is, fibers in which the fine fibers (A) and the ultrafine fibers (B) are unevenly distributed are not preferable in the present invention. In the present invention, the fine fibers (A) and the ultrafine fibers (B) differ not only in the average fineness but also in the fineness of the individual fibers constituting them.

Such an ultrafine fiber-generating fiber (C) is
A polymer constituting the ultrafine fibers (B) and a sea component polymer are mixed at a predetermined mixing ratio, melted in the same melting system, and a polymer constituting the fine fibers (A) melted in another system. Is spun by repeating the joining-splitting a plurality of times at the spinning head to form a mixed system of the two, or by spinning the fibers by defining the fiber shape in the spinneret part and joining them. That is, the polymer forming the ultrafine fibers (B) and the sea component polymer are mixed at a predetermined mixing ratio, and the mixed polymer melted in the same melting system is used as the sea component, and the polymer forming the fine fibers (A) is an island. It can be obtained by composite spinning so that the components are almost uniformly dispersed in the sea component.

Here, the polymers constituting the fine fibers (A) and the ultrafine fibers (B) may be the same or different as described above, but the fineness of the fine fibers (A) is 0. .02 ~
Fineness of 0.2 denier, ultrafine fiber (B) is fine fiber (A)
The average fineness is less than 1/5 and less than 0.02 denier, and the ratio (A / B) of the number is in the range of 2/1 to 2/3. When the fineness of the fine fibers (A) is smaller than 0.02 denier, the product has insufficient color developability, and when it is larger than 0.2 denier, it becomes difficult to secure the appearance quality. Further, in the present invention, it is preferable that the fine fibers (A) have a substantially uniform fineness from the viewpoint of appearance and texture, and specifically, the finest fibers (A) among the finest fibers are the most fine fibers in the fiber bundle. The fineness ratio with thick fibers is preferably in the range of 1: 1 to 1: 3.

The ultrafine fibers (B) prevent pilling by being entangled with the fine fibers (A), and have a fineness of the fine fibers (A) from the viewpoint of maintaining both appearance quality and color development. 1/5 or less of the average fineness of less than 0.02 denier, preferably the average fineness of the fine fibers (A) is 1/10 or less 1/50 or more and 0.01 denier or less and 0.001 denier or more. More preferably, the average fineness is 0.01 denier or less and 0.0015 denier or more.
If the fineness of the ultrafine fibers is too fine, the effect of preventing pilling is low. Therefore, the preferable lower limit is 0.001 denier and the more preferable fineness is 0.0015 denier or more. Extra fine fiber (B)
Generally, as described above, the method of mixing the polymers and melting them under the same conditions is used, so that the variation in the fineness between the fibers is large, but in the present invention, 1/5 of the average fineness of the fine fibers (A).
The following and less than 0.02 denier are the ultrafine fibers (B).

Further, since the ultrafine fibers (B) are obtained from a mixed polymer stream in which polymers are mixed and dissolved in the same melting system, the fiber length is finite, but in view of pilling prevention effect, it is long. 5 mm or more is preferable. The fiber length of the ultrafine fibers (B) can be changed by selecting the combination of polymers at the time of spinning. When the above-mentioned polyester-based or polyamide-based polymer or the like is used as the constituent polymer, a fiber having a sufficiently long fiber length can be obtained. In the present invention, it is preferable that the fiber bundle substantially consists of the fine fibers (A) and the ultrafine fibers (B) described above, but if the amount is a small amount, the fine fibers (A) and the ultrafine fibers ( There may be fibers with a fineness that does not fall into the category of B). Fine fibers (A) existing in one fiber bundle cross section
The range of 15 to 100 is preferable in terms of color developability and appearance.

In the present invention, both the fine fibers (A) and the ultrafine fibers (B) are mixed in the napped fiber forming fiber bundle before buffing, but the ultrafine fibers (B) are used in the buffing for forming the napped hair. ) Is easier to cut, so the number ratio (A / B) of the fine fibers (A) to the ultrafine fibers (B) on the outermost surface of the nap becomes larger than the number ratio (A / B) on the base layer. . The coloring property depends on the thickness and number of fibers on the outermost surface of the napped hair, and the outermost surface of the napped hair is more preferable as the proportion of the fine fibers (A) is higher, and (A / B) is 3/1 or more. , Is necessary for obtaining good color development. It is possible to make the number of ultrafine fibers (B) existing on the outermost surface of the napped hair substantially 0 by selecting the napped treatment condition, in which case (A / B) becomes infinite, but Under the industrial nap treatment conditions, the outermost napped surface (A / B) ratio is 100.
/ 1 or less.

When the (A / B) ratio in the substrate layer is 2/1 or more, (A / B) in the outermost surface of the nap is large, which is preferable from the viewpoint of color developability, but the ultrafine fibers (B) are used. Since the pilling prevention effect due to the entanglement with the fine fibers (A) is greatly reduced, the pilling property of the product is deteriorated. When the (A / B) ratio in the base layer is 2/3 or less, the buffing should be repeated slowly and many times in order to make the (A / B) ratio of the outermost surface of the naps 3/1 or more. Since it must be done, productivity will be poor, and if buffing is performed under strong conditions to improve productivity, fine fibers (A) will also be cut, so a suede-like product with a high-class feeling cannot be obtained. . Therefore, the ratio (A / B) of the number of the fine fibers (A) and the ultrafine fibers (B) in the substrate is
It is extremely important that the ratio is within the range of 2/1 to 2/3 in order to maintain both the appearance quality and the color developability and pilling resistance.

The fineness, the number and the fiber length of the ultrafine fibers (B) can be adjusted by changing the combination of the polymer constituting the ultrafine fibers (B) and the sea component polymer, the melt viscosity, the surface tension and the like. it can. Generally, if the mixing ratio of the polymer constituting the ultrafine fibers (B) to the sea component polymer is increased, the fineness of the ultrafine fibers (B) hardly changes, but the number increases, and if the melt viscosity and the surface tension are increased, the fineness will increase. It is large, the number is small, and the fiber length tends to be short. Based on this tendency, the fineness, the number and the fiber length of the ultrafine fibers (B) in the fibers (C) are determined by appropriately combining the polymer constituting the ultrafine fibers (B) and the sea component polymer and the actual spinning temperature and speed. It can be predicted by performing test spinning according to

The total ratio of the fine fiber (A) component and the ultrafine fiber (B) fiber component in the ultrafine fiber-generating fiber (C) is
40 to 80% by weight is preferable in terms of spinning stability and economy.

The ultrafine fiber-generating fiber (C) is processed into a fiber having a fineness of 2 to 10 denier through a treatment process such as stretching, crimping, heat setting, and cutting, if necessary. The fineness and the average fineness referred to in the present invention are easily obtained from the cross section of the ultrafine fiber-generating fiber (C), that is, a microscopic photograph of the cross section of the ultrafine fiber-generating fiber (C) is taken to obtain the fine fiber (A). It is calculated by counting the number of each of the ultrafine fibers (B) and dividing the weight of each of the fine fibers (A) and the ultrafine fibers (B) constituting the fiber (C) having a length of 9000 m by the respective number. . By the same method, the fiber (C) is transformed into a fiber bundle of the fine fiber (A) and the ultrafine fiber (B), and the fineness of the fine fiber (A) and the ultrafine fiber (B) and Average fineness is required. Regarding the fiber length of the ultrafine fibers (B), the suede-like artificial leather is treated with dimethylformamide or the like to remove the contained elastic polymer, and then the fiber bundle is taken out and observed by a microscope. It is easy to see whether or not

The ultrafine fiber-generating fiber (C) is defibrated with a card to form a random web or a cross-wrap web through a webber, and the obtained fibrous web having a desired weight,
Stack to thickness. Then, a entanglement treatment is performed by a known method such as needle punching or high-speed fluid flow punching to obtain a nonwoven fabric. When forming a non-woven fabric, a small amount of fibers other than the ultrafine fiber-generating fiber (C) may be added if necessary. If necessary, the non-woven fabric may be temporarily fixed by applying a resin capable of being dissolved and removed, for example, a polyvinyl alcohol-based resin.

Next, the fiber-entangled nonwoven fabric is impregnated with an elastic polymer,
Solidify. The elastic polymer impregnated into the fiber-entangled nonwoven fabric is, for example, polyester diol, polyethylene diol,
Average molecular weight of at least one selected from polyether ester diol, polycarbonate diol, etc. 5
Aromatic, alicyclic, fat such as polymer diol of 00-3000 and 4,4'-diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate At least one kind of diisocyanate selected from group-type diisocyanates and at least one low molecular weight compound having two or more active hydrogen atoms such as ethylene glycol and ethylenediamine in a predetermined molar ratio. It is a polyurethane obtained by reaction. Polyurethane is used as a polymer composition to which a polymer such as synthetic rubber or polyester elastomer is added, if necessary.

A polyurethane-based polymer is dissolved in a solvent or dispersed in a dispersant to prepare a polymer liquid.
The fiber-entangled non-woven fabric is impregnated, treated with a polymer non-solvent and wet-solidified to obtain a fibrous substrate. Additives such as colorants, coagulation regulators, and antioxidants are added to the polymer liquid, if necessary. The amount of polyurethane or polyurethane composition in the fibrous substrate is 10 to 5 by weight as solid content.
The range of 0% is preferable.

The fibrous substrate impregnated with the polyurethane polymer and solidified is used as an ultrafine fiber component (B) and a fine fiber component (A).
And a liquid which is a non-solvent for the polyurethane polymer and a solvent or a decomposing agent for the sea component of the ultrafine fiber-forming fiber (C). For example, when (A) and (B) are nylon or polyethylene terephthalate and the sea component is polyethylene, toluene is used, and (A) and (B) are nylon or polyethylene terephthalate and the sea component is In the case of an easily decomposable polyester, an aqueous solution of caustic soda is used. By this treatment, the sea component polymer is removed from the ultrafine fiber generating fiber (C), and the ultrafine fiber generating fiber (C) is transformed into a fiber bundle composed of the ultrafine fiber (B) and the fine fiber (A). . The elastic polymer is substantially absent inside the fiber bundle thus modified. When the non-woven fabric is temporarily fixed with a resin capable of being dissolved and removed, a method of dissolving and removing the resin is used before or after this treatment step.

Next, if necessary, this substrate is sliced into a plurality of sheets in the thickness direction, and at least one surface of the substrate is raised to form a fiber napped surface mainly containing ultrafine fibers. The method of forming the fiber nap surface is sand paper.
A known method such as buffing according to the above is used.

Next, the suede-like fibrous substrate thus obtained is dyed. The dyeing is carried out using a dye mainly composed of an acid dye, a metal complex salt dye, a disperse dye, etc., depending on the kind of fiber.
Dyeing is carried out by an ordinary dyeing method. The dyed suede-like fibrous base material is subjected to finishing treatment such as scuffing, softening treatment and brushing to obtain a suede-like artificial leather product.

The suede-like artificial leather obtained by the present invention is
It has a good appearance and texture, as well as excellent color development and pilling resistance.

[0027]

EXAMPLES The embodiments of the present invention will now be described with reference to specific examples, but the present invention is not limited to these examples. The parts and% in the examples relate to weight unless otherwise specified.

Example 1 6 parts of 6-nylon [microfiber (B)] and polyethylene 3
5 parts and 6-nylon 6 melted in the same melting system
The number of islands [fine fibers (A)] is 50 by the method of spinning 0 parts [fine fibers (A)] melted in another system by defining the fiber shape in the spinneret part. To obtain ultrafine fiber-generating fibers (C) having a fineness of 10 denier. At this time, when the cross section of the fiber (C) was observed, the average number of the ultrafine fibers (B) was about 50, and the fine fibers (A) and the ultrafine fibers (B) were almost uniformly dispersed. The obtained fiber is stretched 3.0 times and crimped, and then the fiber length is 51 m.
After cutting into m and defibrating with a card, a web was made with a cross wrap webber. Next, a fiber entangled nonwoven fabric having a basis weight of 650 g / m 2 was obtained by needle punching. During these steps, the fibers underwent spontaneous shrinkage to approximately 4.5d. This fiber-entangled nonwoven fabric was impregnated with a composition liquid of 13 parts of a polyurethane composition mainly composed of polyether polyurethane and 87 parts of dimethylformamide (hereinafter referred to as DMF), coagulated and washed with water, and then an ultrafine fiber generating fiber (C The polyethylene in) was extracted and removed in toluene to obtain a fibrous substrate having a thickness of about 1.3 mm, which was composed of 6-nylon ultrafine fibers, bundled fibers composed of fine fibers, and polyurethane.

When the cross section of the fiber bundle of this fibrous substrate is observed with an electron microscope, the average fineness of the fine fibers (A) is 0.054.
Denier and almost no variation in fineness, all the ultrafine fibers (B) were 0.01 denier or less and 0.001 d or more, and the average fineness was 0.0045 denier. The fiber length of the ultrafine fibers (B) was mostly 5 mm or more. Buffing one side of this substrate to a thickness of 1.2
After adjusting the thickness to 0 mm, the other surface was treated with an emery buffing machine to form a napped surface of ultrafine fibers, and further Irgalan.
It was stained with Red 2GL (Chiba Geigy) at a concentration of 4% owf. When the napped surface of the suede-like artificial leather obtained by finishing is magnified 500 times with an electron microscope and observed, the (A / B) number ratio is 8/1, which is extremely good for coloring. It was excellent. Furthermore, the appearance and texture were extremely good.

The test results of the obtained suede-like artificial leather are shown in Table 1 together with the results of Comparative Examples.

[0031]

[Table 1]

Comparative Example-1 35 parts of polyethylene as a sea component and 6-as an island component
Except for using ultrafine fiber-generating fiber having a fineness of 10 denier spun to have 50 islands by a method in which 65 parts of nylon is melted in another system and the fiber shape is regulated by the spinneret part to perform spinning. Was treated in the same manner as in Example 1 to obtain a dyed suede-like artificial leather. When the cross section of the ultrafine fiber bundle that constitutes the base of this suede-like artificial leather is observed with an electron microscope, the average fineness of the fine fibers (A) is 0.063 denier, which is equivalent to the ultrafine fibers (B) specified in the present invention. The corresponding fibers were virtually absent. The resulting product was good in color development but inferior in pilling resistance.

Comparative Example-2 6 parts of 6-nylon as a sea component [microfiber (B)] and 50 parts of polyethylene were melted in the same melting system,
The number of fine fibers (A) is 50 by a method in which 35 parts of 6-nylon [fine fibers (A)] as an island component is melted in another system and the fiber shape is regulated by the spinneret part. A suede-like artificial leather dyed in the same manner as in Example 1 was obtained except that the ultrafine fiber-forming fiber having a fineness of 10 denier spun so that the above was used. When the cross section of the ultrafine fiber bundle constituting the base of this suede-like artificial leather is observed with an electron microscope, the average fineness of the fine fibers (A) is 0.034 denier and there is almost no variation in the fineness, and the ultrafine fibers (B) are It was 0.007 denier or less and 0.001 or more, and the average fineness was 0.004 denier. When the cross section of the ultrafine fiber-generating fiber was observed with an electron microscope, the number of ultrafine fibers (B) was about 180. The napped surface of the obtained suede-like artificial leather was magnified 500 times with an electron microscope and observed under a photograph. As a result, the ratio of (A / B) was 2.2 / 1. Met.
Further, there was no problem in terms of pilling resistance.

Example 2 Polyethylene terephthalate 5 parts [microfiber (B)] and polyethylene 30 parts were melted in the same melting system,
The number of fine fibers (A) is 50 by the method of spinning 65 parts of polyethylene terephthalate [fine fibers (A)] melted in another system by defining the fiber shape in the spinneret part. The resulting fiber was spun to obtain an ultrafine fiber-generating fiber having a fineness of 10 denier. At this time, when observing the cross section of the fibers, the average number of the ultrafine fibers (B) was about 50, and the fine fibers (A) and the ultrafine fibers (B) were almost uniformly dispersed.
The obtained fiber was stretched 3.0 times and crimped,
The fiber was cut to a length of 51 mm, defibrated with a card, and then made into a web with a cross lap webber. After this web is punched by a needle, the area is shrunk by 40% in hot water and the weight is 820g.
A fiber entangled non-woven fabric of / m2 was used. The fiber-entangled nonwoven fabric was impregnated with a composition liquid of 13 parts of a polyurethane composition mainly composed of polyether polyurethane and 87 parts of DMF, coagulated and washed with water, and then polyethylene in ultrafine fiber-generating fibers was extracted and removed in toluene. Thus, a 1.3 mm-thick fibrous substrate made of polyethylene terephthalate ultrafine fiber bundle fibers and polyurethane was obtained.

When the cross section of the ultrafine fiber bundle of this fibrous substrate is observed with an electron microscope, the average fineness of the fine fibers (A) is 0.0.
There is almost no variation in fineness at 60 denier, and all the ultrafine fibers (B) are composed of fibers of 0.01 denier or less and 0.0015 d or more, and the average fineness is 0.005 denier. Contained no polyurethane. The fiber length of the ultrafine fibers (B) was mostly 5 mm or more. Buffing one side of this substrate to a thickness of 1.2
After adjusting the thickness to 0 mm, the other surface was treated with an emery buffing machine to form a fine fiber napped surface, and then Resolin
It was stained with Blue 2 BRS at a concentration of 2% owf. The dye adhering to the polyurethane was reduced and washed for finishing. When the napped surface of the obtained suede-like artificial leather was magnified 500 times with an electron microscope and observed,
The number ratio of (A / B) was 8/1, and the color development was extremely excellent. Furthermore, the appearance and texture were extremely good, and the pilling resistance was also excellent.

COMPARATIVE EXAMPLE 3 As a sea component, 5 parts of polypropylene [microfiber (B)] and 35 parts of polyurethane were melted in the same melting system,
The number of fine fibers (A) is 50 by a method in which 60 parts of 6-nylon [fine fibers (A)] as an island component is melted in another system and the fiber shape is regulated by the spinneret part. To obtain ultrafine fiber-generating fibers having a fineness of 10 denier. At this time, observing the cross section with fibers,
The average number of the ultrafine fibers (B) was about 100, and the fine fibers (A) and the ultrafine fibers (B) were dispersed almost uniformly.
The obtained fiber was stretched 3.0 times and crimped,
The fiber length was cut into 51 mm, defibrated with a card, and then made into a web with a cross lap webber. Next, a fiber entangled non-woven fabric having a basis weight of 600 g / m ² was made by a needle punch. This fiber-entangled nonwoven fabric was impregnated with a composition liquid of 4 parts of a polyurethane composition mainly composed of a polyether-based polyurethane and 96 parts of DMF, and at the same time, the polyurethane in the ultrafine fiber-generating fiber was dissolved, coagulated and washed with water. A fibrous substrate having a thickness of 1.3 mm was obtained.

When the cross section of the ultrafine fiber bundle of this fibrous substrate is observed with an electron microscope, the average fineness of the ultrafine fibers (A) is 0.
With 058 denier, there was almost no variation in fineness, the average fineness of the ultrafine fibers (B) was 0.003 denier, and polyurethane was present in a porous state between the ultrafine fibers in the fiber bundle. This fibrous substrate was treated in the same manner as in Example 1 to give a dyed suede-like artificial leather. The product obtained is
The color development was good, but the texture was hard because the ultrafine fibers of the ultrafine fiber bundle were fixed with polyurethane, and the appearance was just a step away.

[0038]

EFFECTS OF THE INVENTION The suede-like artificial leather obtained by the present invention has good appearance and texture, and is excellent in color development and pilling resistance, and is used for clothing, shoes, bags and gloves. it can.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an ultrafine fiber-generating fiber of the present invention.

[Explanation of symbols]

 1 Sea component 2 Island component (fine fiber A) 3 Island component (ultrafine fiber B)

Claims (2)

[Claims] 1. A suede-like artificial leather in which naps made of the fiber bundle are present on the surface of a base made of the fiber bundle and an elastic polymer and dyed, and the fiber bundle constituting the base is , 0.02-0.2 denier fine fibers (A)
And less than 1/5 of the average fineness of the fine fibers (A) and 0.0
It is composed of ultrafine fibers (B) having a fineness of less than 2 denier, the ratio (A / B) of the number is 2/1 to 2/3, and the inside of the fiber bundle substantially contains an elastic polymer. Not
Furthermore, a suede-like artificial leather characterized in that the ratio (A / B) of the number of A's and the number of B's in the fibers constituting the nap is 3/1 or more. 2. A method for producing a suede-like artificial leather in which naps made of the fiber bundle are present on the surface of a substrate made of the fiber bundle and the elastic polymer, and the suede-like artificial leather is dyed. a) to (f) (a) Fine component (A) forming component and fine component (A) having a fineness of 0.02 to 0.2 denier as an island component in a sea component polymer that can be dissolved or decomposed and removed. ) 1 / average fineness
An ultrafine fiber (B) forming component having a fineness of 5 or less and less than 0.02 denier is dispersed in the fiber cross section,
Fine fibers and ultrafine fiber-generating fibers (C) that can be transformed into fiber bundles composed of fine fibers (A) and ultrafine fibers (B) having a ratio (A / B) of the numbers of 2/1 to 2/3. ), (B) a step of producing an entangled nonwoven fabric made of the fiber (C), (c) a step of impregnating the entangled nonwoven fabric with an elastic polymer liquid and wet coagulation, (d) the fiber (C) ) Into a fiber bundle composed of fine fibers (A) and ultrafine fibers (B),
A method for producing a suede-like artificial leather, which comprises sequentially performing (e) a step of forming naps on at least one surface and (f) a step of dyeing the obtained fiber napped suede.