JP2002201573A - Leathery sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leathery sheet comprising a joined type conjugated staple fiber hardly being peeled or split in the longitudinal direction of the fiber even after a carding treatment and a needle-punching treatment, and a high-molecular elastomer, and having excellent feeling. SOLUTION: This leathery sheet comprises a nonwoven fabric composed of the joined type conjugate staple fiber consisting of two kinds of polymer components of A and B, and the high-molecular elastomer. The component A is a polytrimethylene terephthalate-based polyester, and the fiber has a cross- section structure of a laminated structure consisting of five or more total layers of the components A and B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a leather-like sheet. More specifically, the present invention relates to a leather-like leather having excellent texture, comprising a multilayered fiber and a polymer elastic body, which does not substantially peel or split in the longitudinal direction of the fiber even after card processing and needle punching. The present invention relates to a sheet manufacturing method.

[0002] A leather-like sheet composed of a composite staple fiber having a multilayer bonded structure and an elastic polymer is known, and one component is extracted or decomposed and removed from a fiber having a sea-island cross-sectional structure composed of a dispersion component and a dispersion medium component. For the use of non-woven fabric consisting of ultrafine fibers formed by, it can be produced without using an organic solvent or a high-concentration alkaline aqueous solution for extracting or decomposing and removing the dispersion medium component, which has become a problem in recent years, In addition, there is an advantage that no waste corresponding to the sea component to be removed is generated. The components constituting such a composite staple fiber have been subjected to many studies from the viewpoint of process passability and splitting properties for softening by subsequent fine denier, and, in particular, polyethylene terephthalate-based resin and nylon-based resin 2 made of resin
Component systems are preferably used. When observing the cross section of a leather-like sheet made of such a composite staple fiber,
Composite staple fibers comprising a polyethylene terephthalate-based resin and a nylon-based resin having excellent flexibility are further divided in the leather-like sheet, and exhibit a soft texture.

[0003]

As described above, a leather-like sheet having excellent flexibility can be formed from a composite staple fiber comprising a polyester resin and a nylon resin. However, in order to separate the two components, it is necessary to carry out a trace amount reduction of polyethylene terephthalate with an aqueous alkali solution, use of a water jet stream, or strong physical rubbing treatment. However, in the case of an alkaline aqueous solution or its neutralized waste liquid is generated, in the case of actually using a water jet flow, the surface of the leather-like sheet splits well, but the splitting becomes poorer as it goes inside. In particular, it is not suitable for thick artificial leather used for sports shoes and bags, etc., and only thin materials can be manufactured, in which case it is actually difficult to express complete splitting, and splitting is sufficient When a physical force such as that described above is applied, the texture of the obtained leather-like sheet is greatly impaired, and each has its own problems.

[0004] In the case of such a fiber, the bonded portion of the fiber is peeled off during the carding and needle punching of the fiber in the process of manufacturing a nonwoven fabric used for artificial leather.
There is also a disadvantage that splitting makes it difficult to form a nonwoven fabric. Further, since a nylon-based resin is used as one component, it has a soft texture, but there is a difficulty in recycling used or discarded resin waste during manufacturing. Also, when trying to produce so-called suede-like or napback-like artificial leather, the disperse dye for dyeing the polyester-based fiber component and the acid dye for dyeing the nylon-based fiber component, especially a vivid color Chromium or cobalt-based metal complex hydrochloric acid dyes must be subjected to multi-stage dyeing in order to exhibit the following problems. Therefore, if a leather-like sheet composed of a composite staple fiber composed of a polyester-based resin and / or a polyolefin-based resin and an elastic polymer can be produced without using a nylon-based resin, it is more preferable in terms of process and environment. . However, on the other hand, even if a multi-layer laminated composite fiber staple is formed from polyethylene terephthalate and its modified product, and a leather-like sheet is made from this, the texture is as compared to the case where a nylon resin is used for one component. Flexibility and fulfillment,
It has been found that the texture as a leather-like sheet such as surface wrinkles is extremely poor.

[0005]

Means for Solving the Problems The present inventors have found that even after card treatment and needle punching treatment, the fiber can be formed into a nonwoven fabric without substantially peeling and splitting in the longitudinal direction of the fiber, and as one component, a nylon-based material can be used. A leather-like sheet with excellent texture that is mainly or more flexible than a nylon-based resin without using a resin, and silver-finished artificial leather and suede-like processed Or with the task of obtaining nubuck-like standing hair artificial leather,
As a result of intensive studies, the present invention has been reached.

That is, the present invention relates to a leather-like sheet comprising a bonded nonwoven fabric comprising a composite staple fiber comprising two kinds of polymer components A and B or a fiber obtained by peeling off the joint thereof and a polymer elastic body. In the bonded staple fiber, the component A is a polytrimethylene terephthalate-based polyester, and the total number of layers of the component A and the component B is 5
It is a leather-like sheet which is a fiber having a cross-sectional structure of a multi-layer laminated structure having more than one layer. Preferably, the component B
Is a leather-like sheet of polyethylene terephthalate polyester.

The present invention also relates to a method for producing a leather-like sheet with silver, wherein the following steps (1) to (4) are performed in that order. is there. (1) Component A is a polytrimethylene terephthalate-based polyester, component B is a polymer different from component A, and component A and component B have a multilayer bonding structure in which the total number of layers is 5 or more. Manufacturing a nonwoven fabric made of bonded composite staple fibers, (2) applying a polymer elastic body to the nonwoven fabric, and (3) splitting the bonded composite staple fibers in the surface layer by buffing the surface. (4) forming a silver surface layer on the surface of the nonwoven fabric;

[0008] The present invention is also a method for producing a raised leather-like sheet, which comprises performing the following steps (1) to (3) in that order. (1) Component A is a polytrimethylene terephthalate-based polyester, component B is a polymer different from component A, and component A and component B have a multilayer bonding structure in which the total number of layers is 5 or more. Manufacturing a non-woven fabric made of bonded composite staple fibers, (2) applying a polymer elastic material to the non-woven fabric, and (3) buffing the surface of the non-woven fabric to form a multi-layer bonded and bonded composite staple on the surface layer of the non-woven fabric. The process of splitting the fiber,

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The bonded type composite staple fiber used in the present invention is composed of two kinds of polymer components, component A and component B, wherein component A is polytrimethylene terephthalate (hereinafter also referred to as PTT). It is important that the polyester is a polyester. Here, as the PTT-based polyester, besides homopolytrimethylene terephthalate, copolymerized polytrimethylene terephthalate can be mentioned.

In this case, the main acid component is terephthalic acid,
The main glycol component is trimethylene glycol,
If necessary, one or more other dicarboxylic acid components, oxycarboxylic acid components, and other glycol components may be contained as copolymerized units. In this case, as other dicarboxylic acid components, aromatic dicarboxylic acids such as diphenyldicarboxylic acid and naphthalenedicarboxylic acid or ester-forming derivatives thereof; dimethyl 5-sodium sulfoisophthalate, bis (2-sodium sulfoisophthalate) (2 -Hydroxyethyl) and the like, or a metal sulfonate group-containing aromatic carboxylic acid or a derivative thereof; oxalic acid, adipic acid, sebacic acid, dodecanedioic acid, or another such aliphatic dicarboxylic acid or an ester-forming derivative thereof. Examples of the oxycarboxylic acid component include p-oxybenzoic acid, p-β-oxyethoxybenzoic acid, and ester-forming derivatives thereof.

As the glycol component, aliphatic diols such as diethylene glycol, 1,4-butanediol, 1,6-hexanediol and neopentyl glycol;
Examples thereof include 1,4-bis (β-oxyethoxy) benzene, polyethylene glycol, and polybutylene glycol. As used herein, terephthalic acid means that 50% by mole or more, preferably 80% by mole or more of terephthalic acid is occupied by terephthalic acid. The main glycol component is trimethylene glycol by trimethylene glycol. It means that trimethylene glycol accounts for 50 mol% or more, preferably 80 mol% or more.

The component B used in combination with the PTT resin which is the component A which can be used in the bonded type composite staple fiber in the present invention is a resin excellent in recyclability of non-nylon and non-amide resin, Resin S
Any resin can be arbitrarily selected according to its use and performance as long as it is a resin capable of forming a bonded type composite staple fiber by combining in consideration of the balance between the P value and the melt viscosity. Further, in the case of a suede-like or nubuck-like upholstery leather-like sheet, preferably, chromium,
Dyeing is possible without using a metal complex hydrochloric acid dye containing a metal such as cobalt. Examples thereof include polyester polymers such as polyethylene terephthalate and polybutylene terephthalate, polyolefin polymers such as polyethylene and polypropylene, polystyrene polymers, and polyvinyl alcohol polymers.
Examples thereof include a vinyl alcohol-ethylene copolymer, and one or more kinds of each component can be used. For a suede-like or nubuck-like upholstery leather-like sheet, it is preferable to use a polyester-based polymer for the above reasons. Further, among these, the leather-like sheet with silver, the suede-like or nubuck-like napkin-like sheet, and the texture of the obtained leather-like sheet are excellent, so that a polyethylene terephthalate-based polymer can be suitably used as the component B. .

The weight ratio of component A to component B is not critical as long as the desired multilayered cross-sectional structure is formed, but from the viewpoint of the flexibility of the obtained leather-like sheet, component A is preferably used. / Weight ratio of component B is 90/10 to 10/90
And more preferably 80/20 to 20/8.
It is in the range of 0. When one of the weight ratios of the two polymers of the component A and the component B is less than 10%, when the components A and B are alternately arranged before being discharged from the die, the amount of one of the polymers is reduced. Because of the small amount, it tends to be difficult to form a target cross section.

In the present invention, it is important that the cross-sectional structure of the fiber is a multilayer lamination type having 5 or more layers of the components A and B, more preferably 9 to 50 layers. However, the fibers forming the leather-like sheet to be manufactured do not necessarily have to be split, and exhibit excellent flexibility even when they are not split. If the number of layers is four or less, the obtained leather-like sheet has poor flexibility, which is not preferable. In the case of a petal-shaped cross-section, the spacing between the two components becomes narrower toward the center, and one component is substantially connected at the center, so the flexibility of the obtained leather-like sheet is multi-layered. Inferior to type. In addition, the hollow petal type is remarkably inferior to the physical force of the fiber as compared with the multilayer bonding type, and may cause cracking in the card and needle processes. Further, in the petal type and the hollow petal type, the progress of the entanglement in the needle process is slower than in the multilayer lamination type, so that the obtained leather-like sheets have inferior physical properties such as tension, tearing and peeling.

In the present invention, in order to produce a multi-ply bonded staple fiber having a cross-section of a laminated type, the component A and the component B are melted, and these are alternately arranged by a conventional method. And ejected from the nozzle hole. Component A and component B
Both polymers are alternately arranged, and in the portion in contact with the component B and the metal of the die, the ends are rounded due to the surface tension of the component B until the polymer is discharged from the pores inside the die, By flowing the component A into the clearance there, it is also possible to obtain a bonded composite staple fiber having a coating in which the entire outer periphery of the cross section is coated with the component A, and to improve the processability in card processing and needle punch processing. They can be used together as a means.

The fineness of the single yarn of the bonded composite staple fiber is not particularly limited, and the fineness can be arbitrarily selected depending on the use. However, since the texture of the obtained leather-like sheet is excellent, the fineness is 0.5 dtex to 10 dtex. Decitex, more preferably 2 to 7 decitex.
Also, the cut length can be arbitrarily selected depending on the use. The thickness of one layer of each of the component A and the component B constituting the bonded composite staple fiber used in the present invention is preferably 0.05 to 1.5 dtex, and the cross-sectional shape of each layer is defined by the long side and the short side. A rectangle or a trapezoid having a ratio of 2.0 to 20 is preferable in that the effects of the present invention can be highly and reliably achieved.

[0017] Various additives may be blended and used in the bonded staple fiber as required. For example, catalysts, color inhibitors, heat-resistant agents, flame retardants, optical brighteners,
Matting agents, coloring agents, gloss improving agents, antistatic agents, fragrances, deodorants, antibacterial agents, anti-mite agents, inorganic fine particles and the like may be included. Further, the additives may be blended in either one of the components A and B, or both.

The nonwoven fabric used in the method of the present invention may be of the above-mentioned joined type composite staple fiber, having an appropriate thickness and a sense of fulfillment, and having a soft texture. Can be arbitrarily selected depending on the use and the like, and is not particularly limited.
It is preferably about 3.0 mm,
More preferably, it is about mm. The apparent density of the nonwoven fabric is preferably 0.1 to 0.6 g / cm ³ in order to obtain a leather-like sheet having a soft texture,
More preferably, it is 0.15 to 0.50 g / cm ³ . When the apparent density is greater than 0.6 g / cm ³ ,
The resulting sheet tends to have a rubber-like texture.
On the other hand, if the apparent density is less than 0.1 g / cm ³ , the resilience and the feeling of waist are inferior, and the texture tends to be impaired.

The nonwoven fabric used in the method of the present invention is subjected to a treatment such as adhesion of a known compound such as a silicone-based or fluorine-based oil agent, a water-repellent agent, a softening agent, an antistatic agent, a light-resistant stabilizer, or an ultraviolet absorber. It can be carried out. In addition, other fibers may be added to the nonwoven fabric in addition to the above-described bonded staple fibers. Examples of the fiber entanglement method used when manufacturing the nonwoven fabric include a needle punch method and a water entanglement method.
It is preferable because a three-dimensional entangled nonwoven fabric more similar to a leather-like sheet can be obtained.

The elastic polymer used in the method of the present invention comprises:
What is necessary is just a polymer elastic body that has been conventionally used when producing a leather-like sheet. Examples of such a polymer elastic body include a polyurethane resin, an acrylic resin, a polyamide resin such as a polyamide elastomer, a polyester resin such as a polyester elastomer, a polystyrene resin having elasticity, and a polyolefin resin having elasticity. Of these, polyurethane-based resins and acrylic resins are preferably used because they give the leather-like sheet obtained an excellent texture.

As a method for applying the resin, a non-woven fabric is impregnated with a dimethylformamide solution such as polyurethane,
Wet coagulation in water, dewatering, so-called wet coagulation method, and solidification or gelation of resin by hot air, steam, microwave, hot water bath, etc. either alone or in combination of multiple treatments with impregnating emulsion A preferred example is an emulsion method for drying. If the wet coagulation method is adopted, a more natural leather-like texture can be obtained. Further, if an emulsion such as a polyurethane emulsion or an acrylic emulsion, particularly an aqueous emulsion dispersed only with water is used, the leather-like sheet obtained by the method of the present invention can be produced without using an organic solvent. It is preferable because it is a method for producing a leather-like sheet that has a small load on the environment. When these emulsions have a thermosensitive gelling property, the emulsion particles can be thermosensitively gelled without causing migration, and can be uniformly applied. The emulsion can be made thermogelling by emulsifying it with a nonionic surfactant having a low HLB as a surfactant to be emulsified, or by adding a substance called a migration inhibitor to the emulsion as a thermosensitive gelling agent. Examples of the heat-sensitive gelling agent to be added include, for example, inorganic salts such as calcium chloride and a polyethylene glycol-type nonionic surfactant, polyvinyl methyl ether, polypropylene glycol, a silicone polyether copolymer, and a polysiloxane. One or more of these can be used.

The amount of resin applied to the obtained leather-like sheet can be appropriately selected according to the application, but is generally preferably from 5 to 150% by weight, more preferably from 15 to 120% by weight, based on the weight of the nonwoven fabric. Is more preferable,
More preferably, it is 30 to 100% by weight. If the amount of resin adhered is less than 5% by weight, the resulting sheet will lack a sense of fulfillment, and the texture of the leather-like sheet will tend to be poor. On the other hand, if it exceeds 150% by weight, the obtained sheet tends to be hard and the texture of the leather-like sheet tends to be poor. Further, the obtained leather-like sheet may be subjected to a kneading treatment or a softening agent treatment as necessary to improve flexibility.

The sheet made of the nonwoven fabric and the elastic polymer obtained as described above has excellent flexibility and a sense of fulfillment,
It can be suitably used for mattresses, bag lining materials, clothing interlinings, shoe cores, cushioning materials, car interior materials, wall materials, carpets, etc., and has physical properties, texture and appearance similar to natural leather alone. However, by applying a coat layer made of polyurethane or the like to the sheet thus obtained by a known finishing method, a silver-finished artificial leather can be obtained. The obtained sheet is dyed as necessary, and the surface of the multi-layer bonded and joined composite staple fiber is split by buffing the surface to obtain a suede-like or nubuck-like artificial raised leather. it can.

As a method for forming a silver surface layer on the obtained sheet, for example, after impregnating the nonwoven fabric with a solution of a polymer elastic material, drying after coagulation, and preferably by buffing or the like After smoothing the surface of the nonwoven fabric and splitting the fibers of the surface layer, a dimethylformamide solution of polyurethane is applied and solidified in water to form a microporous layer, or without forming the microporous layer. And a method of directly applying a polyurethane resin solution or urethane resin aqueous emulsion dissolved in an organic solvent with a coating machine such as gravure, and drying to form a silver surface layer.

Alternatively, a polyurethane resin solution or a urethane resin aqueous emulsion for forming a skin layer and, if necessary, an intermediate layer and / or an adhesive layer with the nonwoven fabric, is coated on release paper and dried. After impregnating with the solution of the molecular elastic material or the emulsion liquid, drying is performed following coagulation, and the surface is smoothed by buffing and the fiber is split directly into the nonwoven fabric, or on the above-mentioned microporous layer, or separated. A method in which a solution-based or water-based adhesive is applied on the surface layer formed on the pattern paper and a transfer surface is formed to form a silver surface layer can be used. From the environmental point of view, the above-mentioned release paper-making surface is a silver surface layer,
It is more preferable to use an aqueous emulsion for both the intermediate layer and the adhesive layer. The water-based emulsion is most preferably a completely solvent-free type, but may contain about 0.1 to 10% by weight of an organic solvent if necessary. Also in this case, it is preferable to use an alcohol such as ethyl alcohol or isopropyl alcohol, which hardly burdens the environment, as the organic solvent.

The thickness of the grain surface layer is 10 to 500 μm for the microporous layer and 3 to 30 μm for the outermost skin layer.
0 microns is preferred. When forming a silver layer as described above, by splitting the multi-layer bonded and joined composite staple fibers present on the surface of the nonwoven fabric, the silver layer formed on the surface is made smooth and excellent. Since it is possible to form a wrinkled wrinkle and obtain a leather-like sheet with a tone similar to that of natural leather with a silver tone, it is preferable to perform a process such as buffing even when forming a grain surface layer.

In the composition for forming a grain surface layer, the composition for forming an intermediate layer, the composition for forming an adhesive layer, and the composition for forming a microporous layer, a coloring agent such as a pigment, a thickening agent, a crosslinking agent, and a crosslinking accelerator are included. Agents, water repellents, penetrants, antioxidants, light stabilizers, ultraviolet absorbers, hydrolysis stabilizers and the like can also be used. The thus obtained artificial leather with silver tone can be suitably used as artificial leather with silver used for sports shoes, men's shoes, bags, belts, cases and the like.

On the other hand, if necessary, before or after dyeing the sheet obtained by the above-mentioned method by a known method such as conventionally used for producing a leather-like sheet,
By buffing the surface with emery paper or the like to split the multi-layer bonded and joined staple fibers present on the sheet surface, it is possible to obtain a suede-like or nubuck-like artificial raised leather. Further, when producing suede-like or nubuck-like raised artificial leather in this way, if necessary, the polymer elastic body on the surface is dissolved with an organic solvent to form a smooth surface, or the fluff is fixed. Alternatively, the resin emulsion may be subjected to a gravure treatment or a coating treatment, and if necessary, a treatment such as smoothing the surface by hot pressing or the like, or fixing fluff. The suede-like or nubuck-like artificial raised leather thus obtained is suitably used for sports shoes, men's shoes, women's shoes, bags, gloves and the like.

[0029]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In Examples,% and parts are numerical values based on weight unless otherwise specified. In the following examples, the evaluation of the flexibility and texture of the leather-like sheet was performed by the following method.

[Flexibility] Leather-like sheet is 10 × 10 cm
And a pure bending tester (KATOTEKKO KE
Using S-FB2-L), the bending rigidity in the direction perpendicular to the sheet winding direction was measured.

[Hand] The hand was evaluated by a sensory test conducted by 20 randomly selected panelists. The evaluation results mean ；: good, Δ: slightly poor, ×: poor.

Example 1 Homopolytrimethylene terephthalate (2
Melt flow rate at 85 ° C. 10 g / min),
As the component B, homopolyethylene terephthalate (285)
(Melt flow rate at 20 ° C./° C.), the layers were alternately arranged in 11 layers at a weight ratio of 65/35, then discharged from a die and spun at a spinning temperature of 285 ° C. After spinning, the film is stretched and mechanically crimped.
mm to obtain a composite staple fiber having a sectional shape of the type shown in FIG. The fineness of the obtained composite staple fiber was 3.0 decitex. Using this composite staple fiber, card processing was performed to produce a web. As a result, no process trouble occurred in the production of the web, and good passability was exhibited. Further, a needle punching treatment was performed, but the process passability was good.

The thus obtained nonwoven fabric of 240 g / m ² was subjected to a shrinkage treatment in a hot water bath at 70 ° C., and a density of 0.22
g / cm ³ , and then impregnated with an aqueous polyurethane emulsion Bondic 1310NS (polyurethane emulsion manufactured by Dainippon Ink and Chemicals, Incorporated) so that the solid content after drying is 60% by weight of the nonwoven fabric. Surface smoothing and specific gravity matching were performed by a 150 ° C. hot press. The obtained sheet was a leather-like sheet having an excellent texture, an excellent flexural rigidity of 5.3 (gfcm ² / cm), an excellent flexibility, and an evaluation of “O”.

Comparative Example 1 A modified polyethylene terephthalate obtained by modifying 0.5 mol% of terephthalic acid with 5-sodium sulfoisophthalic acid as component A was used in the same manner as in Example 1 except that the fineness of 3.1 dtex was obtained as shown in FIG. A composite staple fiber having a cross section of the type was obtained. Further, a nonwoven fabric was produced in the same manner as in the card treatment and the needle punch treatment. The card passability and needle punch passability on the way were good. The thus obtained 240 g / m ² nonwoven fabric was subjected to a shrink treatment in a hot water bath at 70 ° C. to give a nonwoven fabric having a density of 0.22 g / cm ³ , and then an aqueous polyurethane emulsion bondic 1
310NS (Polyurethane emulsion manufactured by Dainippon Ink and Chemicals, Inc.) is 60% by weight of the non-woven fabric by weight of solid content after drying.
After drying, the surface was smoothed and the specific gravity was adjusted by hot pressing at 150 ° C. The obtained sheet was harder than Example 1 and had a flexural rigidity of 13.3.
(Gfcm ² / cm), the leather-like sheet having a texture evaluation of “x”.

Example 2 Modified polytrimethylene terephthalate obtained by modifying 10 mol% of trimethylene glycol with ethylene glycol as the component A (melt flow rate at 285 ° C. 10
g / min) and a modified polyethylene terephthalate obtained by modifying 0.5 mol% of terephthalic acid with 5-sodium sulfoisophthalic acid as the component B (melt flow rate at 285 ° C. 15 g / min) and a weight ratio of 75
After alternately arranging nine layers at a ratio of / 25, the mixture was discharged from a die and spun at a spinning temperature of 285 ° C. After spinning, it was stretched, mechanically crimped, and then cut into 51 mm to obtain a composite staple fiber having a multilayer laminated cross-sectional structure. The fineness of the obtained composite staple fiber was 4.0 dtex. Using this composite staple fiber, card processing was performed to produce a web. As a result, no process trouble occurred in the production of the web, and good passability was exhibited. Further, a needle punching treatment was performed, but the process passability was good.

The thus obtained 300 g / m ² ,
13 parts of a polyurethane composition mainly composed of polyether-based polyurethane, 86 parts of dimethylformamide and 1 part of a silicone-based coagulation regulator were added to a nonwoven fabric having a density of 0.27 g / cm ^3.
Of dimethylformamide 3 at 40 ° C.
After solidifying the polyurethane in a 0% aqueous solution, wash it with water,
It was dried in a hot air dryer at 100 ° C. to obtain a leather-like sheet. The obtained sheet has an excellent flexural rigidity with a good texture.
The leather-like sheet was excellent in flexibility of 3 (gfcm ² / cm) and had a texture evaluation of “○”. After buffing one side of the obtained sheet to adjust the thickness to 1.3 mm, the sheet was surface-treated with an emery buffing machine, and further, Nippon Kayaku Co., Ltd. disperse dye Kayalon Polyye.
3.0% ow using ster Red AUL-S
Dyeing was performed with a circular dyeing machine at 130 ° C. under the conditions of a concentration f and a bath ratio of 1/20. After drying, a buffing treatment was performed to finish, and a suede-like artificially raised artificial leather was obtained. The obtained suede-tone artificial leather was excellent in appearance and texture, and uneven dyeing of fibers was not observed.

Comparative Example 2 A composite staple fiber having a cross section similar to that of Example 2 having a fineness of 4.0 dtex was obtained in the same manner as in Example 1 except that nylon 6 was used as the component A. Further, a nonwoven fabric was produced in the same manner as in the card treatment and the needle punch treatment. The card passability and needle punch passability on the way were good. After the thus obtained nonwoven fabric having a density of 300 g / m ² and a density of 0.26, a leather-like sheet was obtained by applying a polyether-based polyurethane in the same manner as in Example 2. The obtained sheet has a flexural rigidity of 9.1 (gfcm ^2).
/ Cm) and a leather-like sheet with a texture evaluation of “△”. After one surface of the obtained sheet was buffed and adjusted to a thickness of 1.3 mm, the sheet was surface-treated with an emery buffing machine and further stained with a circular dyeing machine at 130 ° C. under the same conditions as in Example 2. After drying, buffing treatment was performed to obtain a suede-like raised artificial leather. The obtained suede-tone artificial leather was a sheet inferior in appearance, in which uneven dyeing of fibers was conspicuous.

Example 3 Modified polyethylene terephthalate obtained by modifying 0.5 mol% of terephthalic acid with 5-sodium sulfoisophthalic acid as the component A (melt flow rate 1 at 285 ° C.)
5 g / min), and homopolytrimethylene terephthalate (melt flow rate 1 at 285 ° C.)
(0 g / min), the layers were alternately arranged in 11 layers at a ratio of 60/40, and then spun by discharging from a die.
After spinning, it was stretched, mechanical crimped, and then cut to 51 mm to obtain a bonded composite staple fiber. The fineness of the obtained composite staple fiber was 3.3 dtex. Using this composite staple fiber, card processing was performed to produce a web. As a result, no process trouble occurred in the production of the web, and good passability was exhibited. further,
Needle punching was performed, but the process passability was good.

The aqueous polyurethane emulsion Resamine W-1 was added to the thus obtained 350 g / m ² nonwoven fabric.
800 (aqueous polyurethane emulsion manufactured by Dainichi Seika Kogyo Co., Ltd.) was impregnated so that the solid content after drying was 80% by weight of the nonwoven fabric, and after drying, surface smoothing and specific gravity matching were performed by a 150 ° C. hot press. . The obtained sheet has a flexural rigidity with an excellent texture of 8.3 (gfcm ² / cm).
The leather-like sheet was excellent in flexibility and texture evaluation was "O". After buffing the surface of the obtained sheet so as to exhibit smoothness and good folding wrinkles,
A 50-μm-thick polyurethane film colored with a white pigment on a release paper surface was bonded on one side using an aqueous adhesive to obtain an artificial leather with silver. The resulting artificial leather with silver tone was a sheet that was soft and excellent in texture.

Comparative Example 3 Eleven layers were alternately arranged under the same conditions as in Example 3 except that polypropylene was used as the component B, then spun by discharging from a die, spun, stretched, and subjected to mechanical crimping. And then cut to 51 mm to obtain a composite staple fiber. The obtained composite staple fiber had a single yarn fineness of 3.3 denier. When a web was prepared by performing card processing using the composite staple fiber, the card device was clogged, and a good web could not be obtained continuously.

[0041]

According to the method of the present invention, a nonwoven fabric made of a bonded composite staple fiber having excellent process passability and a conventional composite bonded staple fiber using nylon, which has an excellent texture and made of an elastic polymer, are used. Thus, it is possible to obtain a leather-like sheet while reducing the environmental load as compared with the conventional one while having the same or higher flexibility.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross section of a multi-layer bonded type composite staple fiber used in the method of the present invention.

[Explanation of symbols]

 1: (A) polytrimethylene terephthalate 2: (B) polyethylene terephthalate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D06M 15/564 D06M 15/564 4L047 // D02G 1/00 D02G 1/00 Z F-term (Reference) 3B154 AA07 AA17 AB22 BA25 BB58 DA09 DA19 4F055 AA02 AA03 BA12 DA07 DA08 EA04 EA13 EA24 FA15 GA03 HA04 4L033 AA07 AB07 AC11 AC15 CA50 4L036 MA05 MA35 PA01 PA03 RA04 UA21 4L041 AA07 BA04 BA05 CA09 A34 BA06 BC03 DD01 CC16 DA00

Claims (4)

[Claims] 1. A leather-like sheet comprising a non-woven fabric comprising a bonded staple fiber comprising two types of polymer components A and B or a fiber obtained by peeling off a joint thereof and a polymer elastic body. The composite staple fiber is a component A
A leather-like sheet which is a polytrimethylene terephthalate-based polyester and is a fiber having a cross-sectional structure of a multilayer laminated structure in which the total number of layers of component A and component B is 5 or more. 2. The leather-like sheet according to claim 1, wherein the component B is a polyethylene terephthalate-based polyester. 3. A method for producing a grain-finished leather-like sheet, comprising the steps of performing the following steps (1) to (4) in that order. (1) Component A is a polytrimethylene terephthalate-based polyester, component B is a polymer different from component A, and component A and component B have a multilayer bonding structure in which the total number of layers is 5 or more. Manufacturing a nonwoven fabric made of bonded composite staple fibers, (2) applying a polymer elastic body to the nonwoven fabric, and (3) splitting the bonded composite staple fibers in the surface layer by buffing the surface. (4) forming a silver surface layer on the surface of the nonwoven fabric; 4. A method for producing a raised leather-like sheet, wherein the following steps (1) to (3) are performed in that order. (1) Component A is a polytrimethylene terephthalate-based polyester, component B is a polymer different from component A, and component A and component B have a multilayer bonding structure in which the total number of layers is 5 or more. Manufacturing a non-woven fabric made of bonded composite staple fibers, (2) applying a polymer elastic material to the non-woven fabric, and (3) buffing the surface of the non-woven fabric to form a multi-layer bonded and bonded composite staple on the surface layer of the non-woven fabric. Process of splitting fibers