JP2001248023A - Multicomponent fiber and leather-like sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suede leather-like sheet or a grain side layer-having leather-like sheet excellent in flexibility, filled feeling and surface appearance, having high degree of hand feeling like natural leather and excellent in resistance to perspiration deterioration and resistance to oxidation deterioration and provide a fiber used for the same. SOLUTION: This leather-like sheet comprises an interlaced nonwoven fabric consisting of a microfiber comprising a crystalline polyester and a microfiber comprising a polyester obtained by copolymerizing a dimer acid and/or dimer diol. Deniers, composition ratios, etc., of the two kinds of micro fibers satisfy specific relations. The leather-like sheet has napping of the micro fiber or a grain side layer on its surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sense of fulfillment, flexibility,
Also, the present invention relates to a leather-like sheet having an excellent surface appearance, a natural leather-like high-grade feel, and excellent sweat resistance and oxidation resistance. The leather-like sheet is suitable for a vehicle seat. The present invention also relates to a method for producing a leather-like sheet, and a multicomponent fiber used for the method.

[0002]

2. Description of the Related Art Conventionally, as a suede-like leather-like sheet, a sheet in which microfiber naps are present on the surface of a nonwoven fabric substrate provided with a polymer elastic body is known. However, this leather-like sheet is inferior in fullness as compared with natural leather, has a strong rebound, and has a low drape property. Furthermore, the uniformity of the nap on the surface is poor, and as a result, the surface appearance is poor. Moreover, when such a leather-like sheet is manufactured, polyurethane is generally used as a polymer elastic body to be applied to a nonwoven fabric substrate, and the polyurethane is dissolved in a polar organic solvent represented by dimethylformamide, and this solution is converted into a nonwoven fabric. A method of impregnating a large amount and wet-solidifying to give polyurethane to a nonwoven fabric has been used. Dimethylformamide used as a solvent in such a method is harmful to the human body and has a problem of environmental pollution. As a technique for solving such a problem, there has been proposed a leather-like sheet formed of only fibers without using a polymer elastic body and having a structure closer to that of natural leather. For example, Japanese Patent Application Laid-Open No. 61-201086 discloses a process of removing sea components from a nonwoven fabric made of sea-island composite fibers that generates microfibers (A) made of an inelastic polymer and microfibers (B) made of an elastic polymer. A method for producing a leather-like sheet including a step of melting or dissolving an elastic polymer is described. However, it is difficult for the leather-like sheet manufactured by this method to have a texture with an excellent balance between flexibility and fullness. Further, in the case of this method, the step of dissolving the elastic polymer to bond the fibers and the step of removing the sea component are separate, which is not good in efficiency. JP-A-10-37057 discloses a blend composition in which a core is a polyester elastomer, a sheath is polyester or polyamide having a melting point higher than that of the polyester elastomer as an island component, and a polyolefin-based polymer is disposed as a sea component. There has been proposed a method for producing a leather-like sheet base fabric using a core-sheath type conjugate fiber composed of a polyester elastomer of a core portion as a binder component. However, the artificial leather produced by such a method is only a cloth-like material having a poor sense of fulfillment or a hard paper-like material. Although the reason is not clear, the polyester elastomer and polyester or polyamide in the fiber bundle generated after removing the polyolefin-based polymer are sufficiently heat-fused because the heat-fusible component is arranged in the core, The heat fusion between the fiber bundles becomes insufficient, resulting in a fabric-like material with a poor sense of fulfillment. If the heat fusion between the fiber bundles is increased by changing the fusion conditions, etc. This is presumed to be due to the fact that wearing becomes intense, and only paper-like materials having poor flexibility are obtained. Furthermore, since a polyetherester block copolymer is used as the polyester elastomer, durability such as resistance to oxidation deterioration is poor, which is not preferable.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a material which is formed of only fibers or fibers and a small amount of resin without using a large amount of a solution of a polyurethane polar organic solvent as in the prior art. , Excellent surface appearance, natural leather-like high-class texture, and sweat-deterioration resistance,
An object of the present invention is to provide a leather-like sheet having excellent oxidation resistance and suitable for a vehicle seat. Another object of the present invention is to provide an environment-friendly leather-like sheet which can be dyed with a disperse dye not containing a heavy metal such as chromium.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve the above object, and as a result, have used the basic technical idea of fixing the main ultrafine fiber with another ultrafine fiber as a binder. It was found that the above purpose could be achieved if it was, and it was important to use a specific resin as the resin forming the two types of ultrafine fibers, and two types of extrafine fibers were generated. The number of islands of these ultrafine fibers in the multicomponent fiber, the thickness and the ratio of the number of ultrafine fibers (a) as the main fibers and the number of ultrafine fibers (c) as the binder fibers, the ultrafine fibers (a) as the main fibers and the binder It has been found that the ratio of the ultrafine fibers (c) to be fibers is important as a suitable condition. It is particularly important for the artificial leather to use a specific resin as the resin forming the binder fiber in terms of sweat resistance and oxidation resistance. It has been found that the above objects can be achieved by making these specific.

In principle, the present invention relates to a method of bonding a microfiber (a) serving as a main body and a microfiber (c) serving as a binder, as a specific method for generating the microfiber (a) and the microfiber (c). From non-woven fabric consisting of composite fiber (multi-component fiber),
This is a method in which the ultrafine fibers (c) are simultaneously swollen with an organic solvent and partially adhered when the extraction component is removed with an organic solvent, whereby the ultrafine fibers (a) can be adhered while maintaining flexibility. , Both fulfillment and flexibility can be achieved. Furthermore, by using a resin having a specific structure for the ultrafine fiber (c), an artificial leather having excellent durability can be obtained.

That is, the present invention relates to a specific fiber used in such a method, that is, the cross section of the fiber has a sea-island structure, the island component is a crystalline polyester (A), and the sea component is extracted. It is composed of a mixture in which a dispersing component consisting of polyester (C) is present in a dispersing medium component consisting of possible resin (B), and the following conditions (1) to
(5) (1) The polyester (C) is a dicarboxylic acid component mainly containing an aromatic dicarboxylic acid, a diol component mainly containing an alkylene glycol having 2 to 4 carbon atoms, a dimer diol component and / or A copolymer containing a dimer acid component as a constituent component, wherein the content of the dimer diol component and / or the dimer acid component in the copolymer is 50 to 95% by weight; The weight ratio of the crystalline polyester (A) / polyester (C) is 95/5 to 50/50, and (3) the thickness of each island made of the crystalline polyester (A) is 0.00
5 to 0.6 decitex, (4) the thickness of each island made of polyester (C) is 0.0001 to 1 detex, and (5) the number of islands made of crystalline polyester (A) / polyester The multicomponent fiber satisfies that the ratio of the number of islands composed of (C) is 2/1 or less.

[0007] The present invention also relates to a method for producing a leather-like sheet from the above-mentioned multi-component fiber, that is, a non-woven fabric is formed from such a multi-component fiber, and the multi-component fiber is produced from the obtained non-woven fabric. A method for producing a leather-like sheet, comprising extracting and removing a resin (B) in a fiber and fuzzing the surface of the nonwoven fabric or forming a resin layer on the surface of the nonwoven fabric.

Further, the present invention relates to a leather-like sheet produced by such a method, that is, a leather-like sheet composed of a fiber bundle composed of ultrafine fibers of crystalline polyester. The fiber comprises a dicarboxylic acid component mainly composed of an aromatic dicarboxylic acid, a diol component mainly composed of an alkylene glycol having 2 to 4 carbon atoms, a dimer diol component and / or
Or a leather-like sheet characterized by being fixed by a polyester-based ultrafine fiber comprising a copolymer containing a dimer acid component as a constituent component, and preferably, an ultrafine fiber comprising a crystalline polyester (A). A leather-like sheet comprising a fiber bundle composed of a) and ultrafine fibers (c) composed of polyester (C), wherein the fiber bundle satisfies the following conditions (1) to (5). It is a characteristic leather-like sheet. (1) A polyester (C) in which a dicarboxylic acid component mainly containing an aromatic dicarboxylic acid, a diol component mainly containing an alkylene glycol having 2 to 4 carbon atoms, a dimer diol component and / or a dimer acid component Wherein the content of the dimer diol component and / or dimer acid component in the copolymer is 5 to 60% by weight, and (2) the crystalline polyester in the cross section of the fiber bundle. The weight ratio of (A) / polyester (C) is 95/5 to 50/50, and (3) the thickness of each island made of crystalline polyester (A) is 0.00
5 to 0.6 decitex, (4) the thickness of each island made of polyester (C) is 0.005 to 1 decitex, and (5) the number of islands made of crystalline polyester (A) / polyester (C) The ratio of the number of islands is not more than 2/1

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. First, FIG. 1 shows an example of a cross section of the multicomponent fiber of the present invention. In the figure, 1 is a crystalline polyester (A) which is an island component and becomes a main fiber, 2 is a polyester (C) which is a dispersing component and a binder fiber, and 3 is a dispersing medium component and an extractable resin (B). ). In the leather-like sheet of the present invention, the dispersion medium component of the sea component constituting the fiber is extracted with a solvent from the non-woven fabric made of such a multicomponent fiber. In this extraction step, the ultrafine fiber ( c)
By swelling the polyester (C) constituting (hereinafter referred to as binder fiber) and pressing the nonwoven fabric, the ultrafine fiber (a) (hereinafter referred to as main fiber) is partially adhered to the binder fiber or the binder fibers. Fix between fiber bundles. However, if adhesion occurs more than necessary between the fiber bundles and within the fiber bundles, a paper-like sheet is obtained. In order to achieve a natural leather-like fullness, flexibility, and surface appearance, it is important to appropriately bond between and within fiber bundles. In this regard, the resin constituting the binder fiber is particularly important. At the same time, the resin constituting the main fiber is also important.

As the resin constituting the main fiber of the present invention, a crystalline polyester (crystalline polyester (A)) is used because of its proper adhesiveness to the binder fiber and its ability to be dyed with a disperse dye. As a specific example,
Examples include polyester polymers in which a dicarboxylic acid unit such as a terephthalic acid unit or a 2,6-naphthalenedicarboxylic acid unit is combined with a glycol unit such as ethylene glycol, propylene glycol, or butylene glycol.

Further, if necessary, a small amount of other dicarboxylic acid units or oxycarboxylic acid units may be present together with the terephthalic acid unit and the 2,6-naphthalenedicarboxylic acid unit. Other dicarboxylic acid units and oxycarboxylic acid units include isophthalic acid, sodium sulfoisophthalate, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-
Units composed of aromatic dicarboxylic acids such as oxybenzoic acid and aromatic oxycarboxylic acids; aliphatic dicarboxylic acids such as adipic acid, sebacic acid and 1,4-cyclohexanedicarboxylic acid, and alicyclic dicarboxylic acids can be mentioned. .

Further, the crystalline polyester (A) may have a small amount of other glycol units in addition to the above-mentioned glycol units. Other glycol units include diols such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S; and polyoxyalkylene glycol units.

The crystalline polyester (A) contains a polycarboxylic acid such as trimellitic acid and a polyol such as glycerin, trimethylolpropane and pentaerythritol within a range that does not substantially impair the linear structure. Is also good.

Among the above-mentioned crystalline polyesters (A), the glass transition temperature is 50 ° C. or higher, particularly 60 ° C., from the viewpoint of improving the dyeing fastness and durability of the leather-like sheet.
Crystalline polyesters having a temperature of at least ℃ are preferred. The glass transition temperature is measured by a differential calorimeter (DSC). Further, the multicomponent fiber used in the present invention is a composite spin of the crystalline polyester (A) and the polyester (C). From the viewpoint of heat resistance during spinning of the polyester (C), the spinning temperature is 290. It is preferable that the temperature is not higher than ° C. As such a preferred crystalline polyester,
80 mol% or more of the glycol unit which is a constitutional unit of the polyester is composed of at least 80 mol% of the ethylene glycol unit and the dicarboxylic acid unit, and terephthalic acid units,
More preferably, the glycol unit is ethylene glycol, the dicarboxylic acid unit is a mixture of terephthalic acid units and isophthalic acid units or phthalic acid units, and the molar ratio of terephthalic acid units to isophthalic acid units or phthalic acid units is 95. / 5 to 85/15 crystalline polyester. That is, it is a polyethylene terephthalate or polyethylene terephthalate-based copolymer, particularly preferably a polyethylene terephthalate-based copolymer in which isophthalic acid and / or phthalic acid is copolymerized, in which the latter isophthalic acid and / or phthalic acid is copolymerized. When the polyethylene terephthalate copolymer is used, the control of the adhesion between the main fiber and the binder fiber is further facilitated, and a leather-like sheet excellent in texture, such as fullness, flexibility and surface appearance, is obtained.

The intrinsic viscosity of the crystalline polyester (A) of the present invention is 0.50 when measured at 30 ° C. in a mixed solvent of phenol / tetrachloroethane (1/1 weight ratio).
It is preferably in the range of ~ 1.00 dl / g. More preferably, it is in the range of 0.55 to 0.80 dl / g. 0.50 dl / g intrinsic viscosity of crystalline polyester
If it is less than 1, the mechanical properties of the leather-like sheet are inferior and are not preferred. On the other hand, if it exceeds 1.00 dl / g, the spinnability of the multicomponent fiber of the present invention is undesirably reduced.

In the present invention, in order to achieve a natural leather-like high-grade texture excellent in a sense of fulfillment, flexibility and surface appearance, it is important to appropriately bond between and within fiber bundles. Further, it is necessary to have a sweat resistance and an oxidation resistance which are not deteriorated or discolored for a long time at a high temperature of 50 ° C. or more where sweat is present. In order to achieve the above conditions, it is important to select the polyester (C) constituting the binder fiber of the present invention. Extraction and removal of the dispersion medium component (B) in the sea component of the multicomponent fiber from the nonwoven fabric having excellent sweat deterioration resistance, oxidation deterioration resistance, and light deterioration resistance, and composed of multicomponent fibers. At this time, it is important that most of the polyester (C) swells without being dissolved by the solvent used for the extraction, and that the bonding points once bonded between the fiber bundles or within the fiber bundles are not easily separated. As a polyester (C) satisfying such conditions, as a result of trial and error, a dicarboxylic acid component mainly containing an aromatic dicarboxylic acid, a diol component mainly containing an alkylene glycol having 2 to 4 carbon atoms, and a dimer Diol component and / or
Alternatively, it has been found that a copolymer containing a dimer acid component as a component is particularly suitable.

The polyester (C) will be described in more detail. Examples of the aromatic dicarboxylic acid component constituting the polyester (C) include a terephthalic acid unit, a naphthalenedicarboxylic acid unit, and a diphenyldicarboxylic acid unit. If necessary, it may have a small amount of other dicarboxylic acid units or oxycarboxylic acid units in addition to the terephthalic acid unit, naphthalenedicarboxylic acid unit, and diphenyldicarboxylic acid unit. Other dicarboxylic acid units and oxycarboxylic acid units include isophthalic acid, sodium sulfoisophthalate, diphenoxyethanedicarboxylic acid, β-
Aromatic dicarboxylic acids and aromatic oxycarboxylic acids such as hydroxyethoxybenzoic acid and p-oxybenzoic acid; aliphatic dicarboxylic acids and alicyclic dicarboxylic acids such as adipic acid, sebacic acid and 1,4-cyclohexanedicarboxylic acid; Unit.

The polyester (C) has 2 carbon atoms.
Examples of the alkylene glycols 4 to 4 include glycol units such as ethylene glycol, propylene glycol, and butylene glycol. If necessary, it may have a small amount of other glycol units together with the above-mentioned glycol units. Examples of other glycol units include units such as diols such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S.

As a characteristic component constituting the polyester (C), a dimer acid component and / or a dimer diol component is used. The dimer acid refers to a polymerized fatty acid containing a dimer mainly, which is obtained by polymerizing a higher fatty acid containing linoleic acid such as safler oil, soybean oil, linseed oil, and tall oil by a known method. The dimer diol can be obtained by reducing the dimer acid by a known method. In the present invention, any of the dimer acid component and the dimer diol component constituting the polyester (C) may be used, and the dimer acid component and the dimer diol component may be used in an arbitrary composition ratio. The total content of the dimer acid component and / or the dimer diol component in the polyester (C) is 5 to 60.
% By weight. It is preferably from 10 to 50% by weight, more preferably from 15 to 45% by weight. When the content is less than 5% by weight, the obtained leather-like sheet becomes cloth-like, which is not preferable. When the content is more than 60% by weight, the obtained leather-like sheet becomes paper-like, which is not preferable. The total content of the dimer acid component and / or the dimer diol component in the present invention refers to the total weight of the dimer acid and the dimer diol used to synthesize the polyester (C) with respect to the weight of the polyester (C) ( When only one of the dimer acid and the dimer diol is used, it means the ratio of one of the two used).

In the present invention, since a leather-like sheet having particularly good mechanical properties can be obtained, the polyester (C)
Has an intrinsic viscosity of 0.1 when measured at 30 ° C. in a mixed solvent of phenol / tetrachloroethane (1/1 weight ratio).
It is preferably in the range of 90 to 2.5 dl / g, more preferably in the range of 1.10 to 2.3 dl / g.

The polyester (C) may optionally contain an antioxidant such as a hindered phenol compound, a light stabilizer such as a hindered amine compound, and an ultraviolet absorber such as a benzotriazole compound or a benzophenone compound. May be.

In the present invention, the composite form in the multicomponent fiber is important. For example, the binder fibers are present so as to be located around the individual main fibers, that is, the binder fibers are not unevenly distributed in one section of the fiber cross section, but are arranged in the fiber cross section so as to cover around the individual main fibers. It is preferable that they are uniformly dispersed in order to appropriately adjust the adhesion within the fiber bundle and between the fiber bundles. It is necessary for the binder fibers to partially adhere to each other.
It is preferable that the binder fibers and the fibers in which the binder fibers adhere to each other are present so as to partially adhere to the main fibers in order to maintain the fullness and surface appearance of the leather-like sheet.

Further, in the present invention, the thickness of each island of the crystalline polyester (A) and the thickness of each island of the polyester (C) constituting the cross section of the multicomponent fiber are important. The average thickness of each island made of the crystalline polyester (A) is 0.005 to 0.6 dtex,
The average is preferably in the range of 0.01 to 0.5 dtex, more preferably 0.03 to 0.4 dtex. When the individual thickness of the island made of the crystalline polyester (A) is smaller than 0.005 decitex on average, the obtained leather-like sheet has physical properties such as tensile strength and tear strength, and the obtained leather sheet is disperse dye. Is unfavorable because of poor color developability when dyed with. On the other hand, if the thickness of each island is larger than 0.6 dtex on average, it is not preferable because the leather-like sheet obtained has poor surface appearance and flexibility. The average thickness of the individual islands of the polyester (C) is 0.
0001 to 1 decitex. Preferably, the average is 0.0005 to 0.1 decitex, and more preferably, the average is 0.001 to 0.05 decitex.
The average thickness of each island of polyester (C) is 0.00
When the thickness is smaller than 01 decitex, when removing the extracted component with a solvent, the adhesion between the binder fibers in the fiber bundle and between the fiber bundles increases, and the resulting leather-like sheet becomes paper-like, which is not preferable. The average thickness of each island is 1
When the thickness is larger than the decitex, the binder fibers in the fiber bundle and between the fiber bundles are insufficiently adhered to each other when the extraction component is removed by the solvent, and the resulting leather-like sheet becomes cloth-like, which is not preferable. In the present invention, the islands made of polyester (C) may be observed as if the islands adhere to each other during the extraction treatment, and at first glance the thickness of the ultrafine fibers (C) is increased. The thickness of the ultrafine fibers (C) when the ultrafine fibers (C) adhere to each other means the thickness before the adhesion.

Further, the ratio of the number of islands composed of the crystalline polyester (A) / the number of islands composed of the polyester (c) is 2/1 or less. Preferably, it is 1/2 or less, more preferably, 1/5 or less. The ratio of the number of islands is 2
When the ratio exceeds / 1, the binder fibers in the fiber bundle and between the fiber bundles are insufficiently adhered to each other when the extraction component is removed with the solvent, and the obtained leather-like sheet becomes cloth-like, and the fibers are not sufficiently fixed. Fluff easily occurs. The lower limit of the ratio of the number of islands is the crystalline polyester (A)
There is no particular limitation as long as the weight ratio of / polyester (C) and the thickness of each island composed of crystalline polyester (A) and polyester (C) satisfy the conditions of the present invention.

The crystalline polyester (A) constituting the main fiber and the polyester (C) constituting the binder fiber
Is 50/50 to 95/5, preferably 60/4.
It is in the range of 0 to 85/15. When the proportion of the polyester (C) exceeds 50% by weight, the tensile strength of the leather-like sheet is increased.
The mechanical properties such as tear strength and the coloring properties are inferior. On the other hand, when the proportion of the polyester (C) is less than 5% by weight, the leather-like sheet has a poor sense of fulfillment and surface appearance, which is not preferable. Further, the ratio of the total weight of the crystalline polyester (A) and the polyester (C) in the multicomponent fiber is preferably 40 to 80% by weight in view of spinning stability and economy.

The dispersing medium component resin (B) constituting the sea component of the multicomponent fiber is different from the crystalline polyester (A) and the polyester (C) in solubility in a solvent.
A polymer having a low affinity for the crystalline polyester (A) and the polyester (C), and having a lower melt viscosity than the crystalline polyester (A) and the polyester (C) under spinning conditions, or Preferably, the polymer has a low surface tension. Specific examples thereof include, for example, polyethylene, polypropylene, ethylene propylene copolymer, ethylene octene copolymer, ethylene vinyl acetate copolymer, polystyrene, styrene acrylonitrile copolymer, selected from polymers such as styrene ethylene copolymer. At least one polymer is included.

In the leather-like sheet of the present invention, an appropriate crystalline polyester or polyester is selected as the crystalline polyester (A) or the polyester (C) according to the intended use. In order to supplement the surface appearance and mechanical properties of the leather-like sheet, a resin liquid may be used. As the resin liquid to be used, the one that migrates to the surface by heating after impregnating the nonwoven fabric, and at least partially adheres to the main fiber, or the one that gelates by heating after impregnating the nonwoven fabric, to the entire nonwoven fabric Those which are uniform and at least partially adhere to the main fiber are used. For example, known aqueous urethane resin dispersions, aqueous acrylic resin dispersions, urethane solutions and the like can be used. The amount of the resin to be applied is 25 parts by weight or less, preferably 15 parts by weight or less, more preferably 10 parts by weight or less based on 100 parts by weight of the total weight of the main fiber and the binder fiber. When the applied amount exceeds 25 parts by weight, the flexibility of the obtained leather-like sheet is impaired, and it is not preferable from an environmental point of view.

The leather-like sheet of the present invention can be obtained by combining the following steps. That is, it can be obtained by sequentially performing the following steps (a) to (d). (A) The island component is a crystalline polyester (A), and the sea component is
A multi-component having a sea-island structure, which is a mixture in which a dispersion component composed of the polyester (C) is present in a dispersion medium component composed of the extractable resin (B), and which satisfies the conditions (1) to (4). A process for producing a base fiber, (b) a process for producing an entangled nonwoven fabric comprising the fiber, and (c) a sea component (B) in the fiber.
Extracting the main fiber and the binder fiber by extracting it with a solvent or the like, and simultaneously swelling the binder fiber with a solvent to fix the nonwoven fabric, (2) forming nap of the fiber bundle on at least one surface, or A step of forming a resin layer on one side, and the above step (b)
Between (c) and (c), if necessary, the following steps (e) to (g)
May be added, or the following step (h) may be added after the above step (2). (E) a step of shrinking the nonwoven fabric, (f) a step of temporarily fixing the nonwoven fabric with a water-soluble glue or the like, and (g) impregnating and drying a small amount of the resin solution to migrate the resin solution to the surface of the nonwoven fabric. Fixing in a state, (h) dyeing the obtained sheet

Next, the process of the present invention will be described in detail. First, the multicomponent fiber used in the present invention is obtained by mixing the polyester (C) constituting the binder fiber and the dispersion medium polymer (B) in the sea component at a predetermined mixing ratio and melting them in the same melting system. And spinning a crystalline polyester (A) constituting a main fiber melted in another system by spinning and splitting a plurality of times at the spinning head to form a mixed system of the two or spinning a spinneret. It is obtained by a method in which the fiber shape is defined in the section and the fibers are merged and spun. That is,
A crystalline polyester constituting a main fiber by mixing a polyester (C) constituting a binder fiber and a dispersion medium polymer (B) in a sea component at a predetermined mixing ratio and melting the mixed polymer in the same melting system as a sea component. The main fiber and the binder fiber are almost uniformly distributed in the sea component polymer (B), and the binder fiber is formed around the main fiber by compound spinning such that (A) is substantially uniformly dispersed in the sea component as an island component. Can be obtained.

The obtained multi-component fiber is drawn, and if necessary, subjected to processing steps such as crimping, heat setting, and cutting to obtain a fineness of 2%.
繊 維 15 denier fiber.

The multicomponent fibers are defibrated with a card and formed through a webber to form a random or cross-wrapped web. If necessary, other fibers may be mixed. The resulting fibrous web is laminated to the desired weight and thickness.
Next, needle punching is performed by a known method to obtain a needle punched nonwoven fabric. The number of punches is usually 200-25
The range is 00 punches / cm ² .

Next, the fiber-entangled nonwoven fabric is heated to a temperature in the range of 50 to 150 ° C., more preferably in a hot water bath at a temperature in the range of 50 to 95 ° C., to shrink the fiber-entangled nonwoven fabric. It is preferred that By contracting, the leather-like sheet is significantly enhanced. The shrinkage is determined by the type of the crystalline polyester (A) constituting the main fiber and the polyester (C) constituting the binder fiber, spinning conditions, stretching conditions, etc. In order to do so, the area shrinkage is 10 to 60%
It is preferably in the range of, more preferably 20 to
It is in the range of 50%.

If necessary, a step of temporarily fixing the nonwoven fabric with a water-soluble glue or the like or a method of impregnating a small amount of resin liquid is used. When using the method of impregnating the resin liquid,
A method of migrating a water-dispersible resin onto the surface of the nonwoven fabric when drying the resin liquid, impregnating with a thermosensitive gelling resin solution, and exposing it to hot water or steam atmosphere to form a thermosensitive gel and disperse water throughout the nonwoven fabric A method for uniformly gelling the resin is used.

Next, the sea component (B) of the fiber is extracted and dissolved and removed with a solvent to generate a main fiber and a binder fiber. At the same time, the binder fiber is swollen with a solvent to fix the nonwoven fabric. By combining the removal and the pressing with a roll or the like, the nonwoven fabric can be fixed. For example, by using polyethylene as a dispersion medium polymer in the sea component, dissolving the polyethylene with toluene heated to 90 ° C., squeezing the polyethylene with a roll, and fixing the nonwoven fabric at the same time, a sheet excellent in flexibility and fullness. Can be obtained. Regarding the degree of swelling of the binder fiber during the extraction treatment, it is preferable that the weight of the fiber before swelling increases by 15% or more due to swelling in order to achieve the object of the present invention, and more preferably 30 to 10%.
This is the case where it increases by 0%. If the degree of swelling is too high, unnecessarily high adhesion between the fibers occurs, and the fibers themselves are dissolved in a large amount. Of course, in the present invention, it is preferable that the main fiber does not substantially swell upon extraction, and the swelling degree is preferably less than 20%. When polypropylene is used as the dispersion medium polymer, dichlorobenzene is a typical example of the solvent, and ethylene propylene copolymer, ethylene octene copolymer, ethylene vinyl acetate copolymer, polystyrene, styrene acrylonitrile copolymer, styrene In the case of an ethylene copolymer or the like, heated toluene is used. By adjusting the temperature of the extraction treatment, the degree of swelling of the binder fibers can be adjusted to the above-mentioned preferred range. The degree of pressing is a degree generally used when the liquid impregnated in the nonwoven fabric is removed by pressing between rollers, for example, preferably 1 to 3.
-20 kg / cm range, more preferably 2-10 kg
Although the range of / cm is adopted, the influence of the degree of pressing can be almost ignored unless a high compression that deviates from common sense is applied.

Next, at least one surface of the sheet made of the ultrafine fiber entangled non-woven fabric and the resin used as required is subjected to a raising treatment to form a fiber fiber raised surface mainly composed of ultrafine fibers, thereby producing a suede-like leather-like material. A sheet or a resin layer is laminated on at least one side to form a leather-like sheet with a silver surface. As a method for forming the fiber raised surface, a method of buffing using a sandpaper or the like is used after adjusting the thickness of the fibrous substrate to a desired thickness or before adjusting the thickness. If the thickness has not been adjusted, the thickness is adjusted to a desired thickness. Similarly, in the case of a leather-like sheet on which a resin layer is laminated, the thickness is adjusted. As the resin layer laminated on the surface, an elastic polymer layer represented by a polyurethane layer is preferably used. The surface of the nonwoven fabric can be melted by heating the surface and pressing the smooth surface to form a resin layer. Next, the obtained suede-like leather-like sheet or grain surface-like leather-like sheet is dyed as necessary.
This is a dye mainly composed of a disperse dye or the like, and is performed by a usual dyeing method. Further, the leather-like sheet can be subjected to a finishing treatment such as kneading softening treatment and brushing as necessary to obtain a natural leather-like leather-like sheet.

The leather-like sheet obtained by the present invention is excellent in flexibility, fullness, surface appearance, natural leather-like high-grade texture, and excellent in sweat resistance, oxidation resistance and the like. As a type or a type with silver, it is suitable for seats for vehicles, interiors, and the like, and can be used for clothing, accessories, shoes, bags, various gloves, and the like.

[0037]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, parts and% relate to weight unless otherwise specified.

[Number of islands and thickness] The cross section of the multicomponent fiber or fiber bundle was observed with an optical microscope, and the number of islands of the crystalline polyester (A) and the polyester (C) was counted. Next, the respective weight ratios of the crystalline polyester (A) and the polyester (C) in the multi-component fiber are determined, and the thickness (denier) of the multi-component fiber is multiplied by each weight ratio to obtain a value. Was divided by the number of each island.

[Sweat Resistance Deterioration Test] The nap-finished leather-like sheet after dyeing was immersed in an artificial sweat solution for dyeing fastness test.
After squeezing and drying at a squeezing ratio of 70%, a dry heat treatment was performed at 70 ° C. for 3 weeks, and this was subjected to a Gakushin friction tester equipped with a canvas,
The appearance after 30 reciprocations under a load of 500 g weight was evaluated on the following three scales. ；: No change in appearance was observed. Δ: Some pilling occurred on the surface. ×: The surface becomes ragged.

[Oxidative Deterioration Resistance Test] Tensile strength was measured after the dyed-finished fur-like leather-like sheet was exposed to a hot air atmosphere at 120 ° C. for 10 days. The results were evaluated on the following three levels. ：: strength retention; greater than 80% Δ: strength retention; 60 to 80% ×: strength retention; less than 60%

[Hand] The leather-like sheets of the suede type obtained in Examples and Comparative Examples were arbitrarily selected.
The texture was evaluated by 0 panelists. The texture was evaluated on a four-point scale with respect to three items: flexibility, sense of fulfillment, and overall texture. (Flexibility) 4; Flexible 3; Lack of flexibility 2; Feel hard 1; Hard (Feeling of satisfaction) 4; Good 3; Lack of feeling of fullness 2; 4) It is a natural skin-like 3; Somewhat poor 2; It cannot be said that it is a natural skin-like 1;

[Tear Strength] 5.1 of JIS-L1079
It measured by the method based on the C method of 4.

Table 2 shows the resins (polyester (C)) used in the following Examples and Comparative Examples. The resins used as the polyester (A) and the resin (B) used as the sea component in the examples and comparative examples are as follows. PET; polyethylene terephthalate, intrinsic viscosity 0.6
5 g / dl IPA copolymerized PET; crystalline polyester composed of terephthalic acid / isophthalic acid (molar ratio: 90/10) and ethylene glycol, intrinsic viscosity 0.65 g / dlPE;
Mitsui Chemicals, Inc. Polyethylene Mirason FL60

[0044]

[Table 1]

Example 1 20 parts of polyester (1) [binder fiber] and 40 parts of PE were melted in the same melting system as a sea component, and 80 parts of PET (intrinsic viscosity: 0.65 g / dl) were melted as an island component. Fiber] is spun so that the number of islands of the main fiber becomes 25 by a method of spinning while defining the fiber shape at the spinneret portion with a fiber melted in another system, and a multicomponent fiber having a fineness of 13 dtex is obtained. Obtained. At this time, when the cross section of the fiber was observed, the number of islands of polyester (1) was about 720,
The ratio of the number of islands to the number of islands of polyester (1) was 0.035. The obtained fiber was drawn three times, mechanically crimped, cut into a fiber length of 51 mm, defibrated with a card, and then made into a web with a cross wrapper webber. Next, needle punching was performed to obtain a fiber-entangled nonwoven fabric. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric.
The shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 100] is 24% in the vertical direction and 25% in the horizontal direction.
Met. After drying the shrunk nonwoven fabric, the nonwoven fabric is impregnated with an aqueous urethane emulsion so that 5 parts of a solid content of an aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Inc.) is added to the nonwoven fabric.
It dried with the hot air of 0 degreeC. Then, the PE in the multicomponent fiber
Was removed by treatment with toluene at 90 ° C., at which time 4 kg /
The liquid was squeezed by passing between rollers with a pressure of cm. Then, a fibrous base material having a thickness of about 1 mm comprising PET and polyester (1) was obtained. In addition, PE of the main fiber
The fineness (calculated value) of the T fiber was 0.13 decitex, and the fineness (calculated value) of the fiber composed of the polyester (1) as the binder fiber was 0.0011 decitex. One surface of the fibrous base material is buffed with sandpaper to adjust the thickness to 0.75 mm, and the other surface is treated with an emery buffing machine to form an extremely fine nap surface, and further dispersed with a circular jet dyeing machine. After dyeing brown using, a leather-like sheet having a specific gravity of 0.48 was obtained. The feeling of fulfillment and flexibility was excellent, the nap was uniform, and the surface appearance was excellent. Further, as shown in Table 4, the results of the sweat resistance test and the oxidation resistance test were also good.

Example 2 Separately, 20 parts of polyester (2) [binder fiber] and 40 parts of PE were melted in the same melting system as a sea component, and 80 parts of IPA copolymerized PET [main fiber] was melted as an island component. The melted fiber was spun so that the number of islands of the main fiber was 25 by a method of spinning while defining the fiber shape at a spinneret, to obtain a multicomponent fiber having a fineness of 13 dtex. At this time, when observing the cross section of the fiber, the number of islands of polyester (2) was about 740, and the ratio of the number of islands of PET / the number of islands of polyester (2) was 0.034. The obtained fiber is stretched three times and mechanically crimped to give a fiber length of 51.
It was cut into mm, defibrated with a card, and made into a web with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. Shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 10
0] was 26% in the vertical direction and 26% in the horizontal direction.
After drying the shrinked nonwoven fabric, the nonwoven fabric is impregnated with an aqueous urethane emulsion so that the solid content of the aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Inc.) is added to the nonwoven fabric at 3 parts. And dried with hot air. Next, the PE in the multi-component fiber was removed by treatment with toluene at 90 ° C., and at this time, the solution was squeezed with a roller under the same pressing conditions as in Example 1. Then, a fibrous base material having a thickness of about 1 mm comprising PET and polyester (2) was obtained. The fineness (calculated value) of the main fiber was 0.13.
The fineness (calculated value) of the fiber composed of decitex and polyester (2) as the binder fiber was 0.0011 decitex. One surface of the fibrous base material is buffed with sandpaper to adjust the thickness to 0.75 mm, and the other surface is treated with an emery buffing machine to form an extremely fine nap surface, and further dispersed with a circular jet dyeing machine. After dyeing brown using, a leather-like sheet having a specific gravity of 0.49 was obtained. The feeling of fulfillment and flexibility was excellent, the nap was uniform, and the surface appearance was excellent. Further, as shown in Table 4, the results of all the durability tests were good.

Example 3 Separately, 20 parts of polyester (3) (binder fiber) and 40 parts of PE were melted in the same melting system as the sea component, and 80 parts of IPA copolymerized PET (main fiber) were melted in the same system as the island component. The melted fiber was spun so that the number of islands of the main fiber was 25 by a method of spinning while defining the fiber shape at a spinneret, to obtain a multicomponent fiber having a fineness of 13 dtex. At this time, when observing the cross section of the fiber, the number of islands of polyester (3) was about 660, and the ratio of the number of islands of PET / the number of islands of polyester (3) was 0.038. The obtained fiber is stretched three times and mechanically crimped to give a fiber length of 51.
It was cut into mm, defibrated with a card, and made into a web with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. Shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 10
0] was 23% in the vertical direction and 24% in the horizontal direction.
After drying the contracted nonwoven fabric, the nonwoven fabric is impregnated with an aqueous urethane emulsion so that 100 parts of the nonwoven fabric is provided with 3 parts of a solid content of an aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Incorporated). 13
It dried with the hot air of 0 degreeC. Observation of the non-woven fabric after drying showed that the urethane resin adhered to the non-woven fabric near the non-woven fabric surface. Next, the PE in the multicomponent fiber was removed by treatment with hot toluene at 90 ° C., and the solution was squeezed under the same conditions as in Example 1, and the PET and polyester (3) having a thickness of about 1 mm were formed. A fibrous substrate was obtained. The fineness (calculated value) of the main fiber was 0.13 dtex, and the fineness (calculated value) of the fiber composed of the polyester (3) as the binder fiber was 0.0012 dtex. One side of the fibrous base material is buffed with sandpaper and the thickness is 0.75mm
After the thickness was adjusted, the other surface was treated with an emery buffing machine to form an extremely fine nap surface, and further dyed brown using a disperse dye with a circular jet dyeing machine, and finished with a specific gravity of 0.1. 50 leather-like sheets were obtained. The feeling of fulfillment and flexibility was excellent, the nap was uniform, and the surface appearance was excellent.
Further, as shown in Table 4, the results of the sweat resistance test and the oxidation resistance test were also good.

Example 4 20 parts of polyester (4) [binder fiber] and 40 parts of PE were melted in the same melting system as a sea component, and 80 parts of IPA copolymerized PET [main fiber] were melted in another system as an island component. The melted fiber was spun so that the number of islands of the main fiber was 25 by a method of spinning while defining the fiber shape at a spinneret, to obtain a multicomponent fiber having a fineness of 13 dtex. At this time, when observing the cross section of the fiber, the number of islands of polyester (4) was about 750, and the ratio of the number of islands of PET / the number of islands of polyester (4) was 0.033. The obtained fiber is stretched three times and mechanically crimped to give a fiber length of 51.
It was cut into mm, defibrated with a card, and made into a web with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. Shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 10
0] was 24% in the vertical direction and 25% in the horizontal direction.
After drying the contracted nonwoven fabric, the nonwoven fabric is impregnated with an aqueous urethane emulsion so that 100 parts of the nonwoven fabric is provided with 3 parts of a solid content of an aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Incorporated). 13
It dried with the hot air of 0 degreeC. Then, the PE in the multicomponent fiber
Was removed by treating with hot toluene at 90 ° C., and the solution was squeezed under the same conditions as in Example 1 to obtain a fibrous base material of PET and polyester (4) having a thickness of about 1 mm. The fineness (calculated value) of the main fiber was 0.13 dtex, and the fineness (calculated value) of the fiber made of the polyester (4) as the binder fiber was 0.0011 dtex. One surface of the fibrous base material is buffed with sandpaper to adjust the thickness to 0.75 mm, and the other surface is treated with an emery buffing machine to form an extremely fine nap surface, and further dispersed with a circular jet dyeing machine. After dyeing brown using, a leather-like sheet having a specific gravity of 0.49 was obtained.
The feeling of fulfillment and flexibility was excellent, the nap was uniform, and the surface appearance was excellent. Further, as shown in Table 4, the results of the sweat resistance test and the oxidation resistance test were also good.

Comparative Example 1 As a sea component, 20 parts of polyester (5) [binder fiber] and 40 parts of PE were melted in the same melting system.
PET (intrinsic viscosity 0.65 g / dl) 80 as an island component
The part [main fiber] melted by another system is spun so that the number of islands of the main fiber becomes 25 by a method of defining the fiber shape at the spinneret and spinning, and a multi-component having a fineness of 13 decitex. A system fiber was obtained. At this time, when the cross section of the fiber was observed, the number of islands of polyester (5) was about 640,
The ratio of the number of islands of T to the number of islands of polyester (5) is 0.039.
Met. The obtained fiber was drawn three times, mechanically crimped, cut into a fiber length of 51 mm, defibrated with a card, and then made into a web with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. The shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 100] is 24% in the vertical direction and 2% in the horizontal direction.
5%. After drying the contracted nonwoven fabric, the nonwoven fabric 1
The nonwoven fabric was impregnated with an aqueous urethane emulsion and dried with hot air at 130 ° C. such that three parts of a solid content of an aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Inc.) were added to 00 parts. Next, the PE in the multicomponent fiber was removed by treatment with toluene at 90 ° C., and squeezed at a pressure of 4 kg / cm as in Example 1, to a thickness of about 1 mm consisting of PET and polyester (5). Was obtained. The fineness (calculated value) of the main fiber is 0.13
The fineness (calculated value) of the fiber composed of decitex and polyester (5) as the binder fiber was 0.0013 decitex. One surface of the fibrous base material is buffed with sandpaper to adjust the thickness to 0.75 mm, and the other surface is treated with an emery buffing machine to form an extremely fine nap surface, and further dispersed with a circular jet dyeing machine. After dyeing brown using, a leather-like sheet having a specific gravity of 0.48 was obtained. The feeling of fulfillment and flexibility was excellent, the nap was uniform, and the surface appearance was excellent. However, as shown in Table 4, the results of the sweat resistance test and the oxidation resistance test were considerably inferior.

Comparative Example 2 As a sea component, 20 parts of a polyester (6) [binder fiber] and 40 parts of PE were melted in the same melting system.
Spinning is performed so that the number of islands of the main fiber becomes 25 by a method in which 80 parts of PET [main fiber] is melted by another system as an island component and the fiber shape is defined by a spinneret to spin. A decitex multicomponent fiber was obtained. At this time, when the cross section of the fiber was observed, the number of islands of the polyester (6) was about 850, and the number of islands of PET / polyester (6)
Was 0.029. The obtained fiber is stretched three times, mechanically crimped, cut into a fiber length of 51 mm,
After defibrating with a card, the web was formed with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. The shrinkage ratio ((length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 100) was 29% in the vertical direction and 29% in the horizontal direction. After drying the shrinkable nonwoven fabric, 100 parts of the nonwoven fabric was mixed with an aqueous emulsion (Bondick 1 manufactured by Dainippon Ink and Chemicals, Inc.).
The nonwoven fabric was impregnated with the aqueous urethane emulsion so as to give 3 parts of the solid content of 310), and dried with hot air at 130 ° C. Next, the polyethylene in the multi-component fiber was removed by treatment with toluene, and the solution was squeezed under the same conditions as in Example 1. As a result, PET and polyester (6)
Thus, a fibrous substrate having a thickness of about 1 mm was obtained. The fineness (calculated value) of the main fiber was 0.14 decitex, and the fineness (calculated value) of the fiber made of polyester (6), which is a binder fiber, was 0.0010 decitex. One surface of the fibrous base material is buffed with sandpaper to a thickness of 0.
After adjusting the thickness to 75 mm, the other surface is treated with an emery buffing machine to form a very fine nap surface, and further dyed brown using a disperse dye with a circular jet dyeing machine, finished, and finished with specific gravity A leather-like sheet of 0.53 was obtained. Because the adhesion between fibers is more than necessary, the resulting leather-like sheet is
Some were paper-like and hard, and the tear strength was poor as shown in Table 3 below.

Comparative Example 3 As a sea component, 20 parts of polyester (7) [binder fiber] and 40 parts of PE were melted in the same melting system.
PET (intrinsic viscosity 0.65 g / dl) 80 as an island component
The part [main fiber] melted by another system is spun so that the number of islands of the main fiber becomes 25 by a method of defining the fiber shape at the spinneret and spinning, and a multi-component having a fineness of 13 decitex. A system fiber was obtained. At this time, when the cross section of the fiber was observed, the average number of the main fibers was about 500, and the ratio of the number of PET islands / the number of polyester (7) islands was 0.050. The obtained fiber was drawn three times, mechanically crimped, cut into a fiber length of 51 mm, defibrated with a card, and then made into a web with a cross wrapper webber. Next, a fiber entangled nonwoven fabric was obtained by needle punching. This fiber-entangled nonwoven fabric was immersed in a bath containing hot water at 90 ° C. to shrink the nonwoven fabric. The shrinkage ratio [(length of nonwoven fabric after shrinkage / length of nonwoven fabric before shrinkage) × 100] is 20% in the vertical direction and 1 in the horizontal direction.
9%. After drying the contracted nonwoven fabric, the nonwoven fabric 1
The nonwoven fabric was impregnated with an aqueous urethane emulsion and dried with hot air at 130 ° C. such that three parts of a solid content of an aqueous emulsion (Bondick 1310 manufactured by Dainippon Ink and Chemicals, Inc.) were added to 00 parts. Next, the PE in the multicomponent fiber was removed by treating with 90 ° C. toluene at 90 ° C., and the liquid was squeezed using the same pressing conditions as in Example 1. As a result, the thickness of PET and polyester (7) was reduced. About 1
mm of fibrous substrate was obtained. The fineness (calculated value) of the main fiber is 0.12 decitex, and the fineness (calculated value) of the fiber made of the polyester (7) as the binder fiber is 0.001.
It was 5 dtex. One surface of the fibrous base material is buffed with sandpaper to adjust the thickness to 0.75 mm, and the other surface is treated with an emery buffing machine to form an extremely fine nap surface, and further dispersed with a circular jet dyeing machine. After dyeing brown using, a leather-like sheet having a specific gravity of 0.37 was obtained. The fabric-like leather-like sheet was not full.

[0052]

[Table 2]

[0053]

[Table 3]

[0054]

The leather-like sheet of the present invention is excellent in flexibility, fullness, surface appearance, natural leather-like high-class texture, and excellent in sweat resistance and oxidation resistance. give.

[Brief description of the drawings]

FIG. 1 is a schematic view of one example of a cross section of a multicomponent fiber of the present invention.

[Explanation of symbols]

1: Crystalline polyester (A) which is an island component and becomes a main fiber 2: Polyester (C) which is a dispersion component and a binder fiber 3: A resin (B) which is a dispersion medium component and can be extracted

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (reference) // D06M 11/00 D06M 11/00 9/02 C F term (reference) 4F055 AA02 BA02 DA07 EA04 EA12 EA14 EA16 EA24 EA29 EA30 EA31 EA34 EA35 FA15 GA03 HA03 4L031 AA18 AB34 BA32 CA15 DA05 4L041 AA07 BA04 BA06 BA16 BD11 BD15 BD20 CA06 CA10 CA11 CA13 CA36 DD01 DD11 DD14 DD15 EE06 EE07 EE16 EE20 4L047 AA08 AB27 AA02AB27A02A27B

Claims (4)

[Claims] 1. A dispersion comprising a polyester (C) in a dispersion medium component comprising a crystalline polyester (A) wherein the island component is a crystalline polyester (A) and a resin (B) from which the sea component is extractable. The following conditions (1) to (5) (1) The polyester (C) is composed of a mixture in which the component is present, and the polyester (C) has a dicarboxylic acid component having an aromatic dicarboxylic acid as a main component and a carbon number of 2 to 2 4) a copolymer comprising a diol component mainly composed of an alkylene glycol and a dimer diol component and / or a dimer acid component, wherein the dimer diol component and / or the dimer acid component in the copolymer (2) the weight ratio of the crystalline polyester (A) / polyester (C) in the fiber is 95/5 to 50/50, and (3) the crystal. The thickness of each island made of the conductive polyester (A) is 0.005.
0.6 decitex, (4) the thickness of each island made of polyester (C) is 0.0001 to 1 decitex, and (5) the number of islands made of crystalline polyester (A) / polyester ( A multicomponent fiber that satisfies that the ratio of the number of islands composed of C) is 2/1 or less. 2. A non-woven fabric is formed from the multi-component fiber according to claim 1, the resin (B) in the multi-component fiber is extracted and removed from the obtained non-woven fabric, and the surface of the non-woven fabric is fluffed. Alternatively, a method for producing a leather-like sheet, comprising forming a resin layer on the surface of the nonwoven fabric. 3. A leather-like sheet composed of a fiber bundle composed of ultrafine fibers made of crystalline polyester, wherein the ultrafine fibers comprise a dicarboxylic acid component having an aromatic dicarboxylic acid as a main component and a carbon number of 2 or less. Leather-like, characterized in that it is fixed by a polyester-based ultrafine fiber composed of a copolymer comprising a diol component having an alkylene glycol as a main component and a dimer diol component and / or a dimer acid component. Sheet. 4. A leather-like sheet comprising a fiber bundle composed of an ultrafine fiber (a) composed of a crystalline polyester (A) and an ultrafine fiber (c) composed of a polyester (C), wherein the fiber bundle comprises the following: The conditions (1) to (5) (1) wherein the polyester (C) comprises a dicarboxylic acid component mainly containing an aromatic dicarboxylic acid, a diol component mainly containing an alkylene glycol having 2 to 4 carbon atoms, A copolymer comprising a dimer diol component and / or a dimer acid component as a constituent component, wherein the content of the dimer diol component and / or the dimer acid component in the copolymer is 5 to 60% by weight; 2) Crystalline polyester (A) / block copolymer (C) in fiber bundle cross section
(3) The thickness of each island made of the crystalline polyester (A) is from 0. 5 to 50/50.
005-0.6 dtex, (4) the thickness of each island made of polyester (C) is 0.0001-1 dtex, and (5) the number of islands made of crystalline polyester (A) / polyester A leather-like sheet satisfying that the ratio of the number of islands composed of (C) is 2/1 or less.