JP2000212880A - Production of artificial leather having nap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing artificial leather having nap, capable of compensating decrease in resilience, dimensional stability and abrasion resistance due to being made to be lightweight, thin and flexible. SOLUTION: This method for producing artificial leather having nap is to laminate one web layer A made of <=1.5 dtex ultra fine fiber on the other web layer B made of polyester fiber melt-spun at 2,000-4,000 m/min, having (20-100)×10-3 birefringence and not subjected to drawing and heat treatment at a temperature equal to or higher than the secondary transition temperature of a polyester in a weight ratio (the layer A/the layer b) of (20/80)-(90/10) and to subject the double layered product to the following treatments in a numerical order: (1) subjecting the double layered product to needling with a sewing and knitting machine having stitching needles so as for stitch-like loop coupling to be formed in a state of stripes on the surface of the layer B, not subjected to lamination treatment; (2) heat treatment at a temperature equal to or higher than the secondary transition temperature of polyester fiber forming the layer B; (3) imparting polymer elastomer; (4) raising the nap; (5) dyeing and finishing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing artificial leather having naps having excellent rebound resilience, dimensional stability and abrasion resistance.

[0002]

2. Description of the Related Art In the field of clothing, with the diversification of fashions, there is a shift to lighter, thinner fabrics and more flexible. In particular, in artificial leather with a nonwoven fabric substrate as a substrate, if lightweight and thin, softness is easily obtained, but strength, shape stability tends to decrease, and if emphasis is placed on strength,
It was lightweight, hard to thin, and lacked the balance of product characteristics.

[0003]

As a means for solving these problems, the present inventors have disclosed JP-A-63-2196.
No. 2 proposes a technique using a new entangled structure completely different from the nonwoven fabric structure obtained from the conventional needle punch or water jet punch technique, and although the above problems can be solved to some extent, The problem that the resilience of the product was insufficient due to the softening and that the product was easily wrinkled remained.

The present invention is to provide a method for producing artificial leather having naps, which has improved such problems, that is, lightweight, thin fabric, rebound resilience, dimensional stability and abrasion resistance accompanying softening. is there.

[0005]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the production method of artificial leather having a napped of the present invention, the web layer consisting of ultrafine fibers 1.5dtex and ^{(A), 20 × 10 -3} ~100 taken off at a melt spinning rate 2000～4000M / min A polyester fiber web layer (B) having a birefringence of × 10 ^-3 , but not subjected to a stretching treatment and a heat treatment at or above the secondary transition temperature,
After laminating at a ratio of (A) / (B) = 20/80 to 90/10% by weight, the layers are passed in the order of the following steps (1) and (2), and then the following steps (3), (4) and ( The processing is performed in the order of 5).

(1) A step of passing through a sewing machine having stitching needles and needling so that a striped stitch-like loop entanglement is formed on the non-laminated surface of the laminated web layer (B) ( 2) Polyester fiber 2 forming web layer (B)
Step of performing a heat treatment at a temperature equal to or higher than the next transition point temperature (3) Step of providing an elastic polymer (4) Step of raising the brush.

(5) Dyeing and finishing process

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has been made intensely studied on the above-mentioned problems, that is, a method for producing artificial leather having naps, which has improved resilience, dimensional stability and abrasion resistance due to lightening, thin fabric and softening. A three-dimensional entangled body obtained by laminating a web (A) using ultrafine fibers and a web (B) of polyester fibers drawn at a melt spinning speed of 2000 to 4000 m / min and having a specific category of birefringence. Surprisingly, it has been found that such a problem can be solved at once by treating the fibrous structure with special conditions and subjecting it to leather processing.

Examples of the polymer forming the ultrafine fibers and / or ultrafine fiber bundle used in the present invention include polyamides such as nylon 6, nylon 66, nylon 12, and copolymerized nylon, polyethylene terephthalate, copolymerized polyethylene terephthalate, and poly (ethylene terephthalate). Polyesters such as butylene terephthalate, copolymerized polybutylene terephthalate, polypropylene terephthalate and copolymers thereof can be used.

[0010] These ultrafine fibers are obtained by direct spinning using a single component, or after forming a composite fiber using the above polymer as an ultrafine fiber component, at least one component is dissolved and removed or by physical action. Any of those obtained by peeling, dividing, and the like can be used. The cross-sectional shape of the ultrafine fibers is not particularly limited, and additives such as a light-proof agent, a pigment, a matting agent, an antistatic agent, and a flame retardant may be added to the ultrafine fiber-forming polymer as needed. Can be used.

The thickness of the ultrafine fibers is 1.5 dtex or less, preferably 1.0 dtex or less, more preferably 0.5 dt, from the viewpoints of color development, texture, touch and the like.
ex and the following are used. The lower limit of the thickness of the ultrafine fibers is 0.0
The effect of the present invention can be sufficiently exerted even with about 001 dtex, and a mixture of ultrafine fibers having different thicknesses may be used. In order to form a uniform entangled layer (A) of such ultrafine fibers, the above-mentioned conjugate fibers are usually made into short fibers having a length of 20 mm or more, preferably 40 mm or more, and a web is made with a card / cloth wrapper. It is preferable to perform ultra-fine processing during processing.

An important component of the present invention is that the web has a birefringence of 20 × 10 ^{−3 to} 100 × 10 ⁻³ drawn at a melt spinning speed of 2000 to 4000 m / min, more preferably 2500. A web made of polyester fibers having a birefringence of 30 × 10 ^{−3 to} 60 × 10 ⁻³ drawn at a speed of ３3500 m / min, but not subjected to a stretching treatment and a heat treatment at a second transition temperature or higher. (B) is laminated. When the birefringence deviates from these categories, it becomes difficult to obtain the good resilience characteristics aimed at by the present invention.

As the polymer for forming such polyester fibers, polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate or copolymers based on them are preferably used.
By subjecting the undrawn yarn fiber to a heat treatment at a temperature higher than the temperature at which crystallization is possible, that is, at a temperature higher than the secondary transition temperature of the polyester fiber, rebound resilience is exhibited. Therefore, in the present invention, it is important to make the web in a state where the heat treatment is not performed at a temperature higher than the secondary transition temperature of the polyester fiber, and this web (B) is laminated with the above-mentioned ultrafine fiber web (A). Is what you do. The cross-sectional shape of the polyester fiber is not particularly limited, and the thickness of the fiber may be appropriately determined in consideration of the flexibility and thickness of the product. The laminating ratio is as follows: the ultrafine fiber web (A) /
Polyester fiber web (B) = 20 / 80-90 / 1
0% by weight, preferably 30/70 to 80/20% by weight,
More preferably, it is 40/60 to 70/30% by weight.
When the content of the ultrafine fiber web (A) is less than 20% by weight, the formation of a strasp stitch-like loop-like entanglement covering the surface of the entangled layer (B) of polyester fibers is reduced, and the abrasion resistance and flexibility are reduced. And the ultrafine fiber web (A) has 9
If the content exceeds 0% by weight, the degree of coating is increased, but the rebound resilience effect is undesirably reduced. The web can be used either in a state in which the wraps delivered from the cross-wrapper layer are simply laminated, or in a state in which the laminated wraps are lightly needled.

According to the present invention, the ultrafine fibers substantially penetrate in the entangled layer (B) of the polyester fibers and penetrate therethrough. It is important to coat in a stripe form with a strasp stitch-like loop-like entanglement. A method for producing such a fiber-entangled structure can be achieved by passing the above-described laminated web through a sewing machine having stitching needles. In this case, the polyester fiber entangled layer (B)
Stitching needle from the non-laminated surface of
By processing continuously so as to be extracted, the stitching needles hook the microfine fibers in a bundle, penetrate through the polyester fiber web (B), and are pulled out as a loop on the non-laminated surface. A stitching needle sticks inside, hooks the ultrafine fibers in a bundle, penetrates through the polyester fiber web, and is pulled out as a loop on the non-laminated surface of the polyester fiber, so that the striped continuous in the vertical direction A net-like loop-like entanglement is formed. That is, an advanced fiber entangled structure having a continuous mesh-like loop-like entanglement in which the non-laminated surface of the polyester fiber has a striped continuous mesh-like entanglement in the vicinity of the surface of the ultrafine fiber layer is in a nonwoven fabric state. The number of fiber bundles that penetrate the web and are pulled out as a non-loop
It is possible to change by changing the stitching needle conditions, and if you want to obtain a high-powered product,
The number of fiber bundles is reduced, and the stitching length formed by the mesh-like loop is preferably 0.5 mm or more and 5.0 mm or less, more preferably 1.0 mm or more and 3.0 mm or less. If it is less than 0.5 mm, it is difficult to obtain a uniform basis weight, and if it exceeds 5.0 mm, the strength is reduced and dimensional changes are likely to occur. Further, the interval between the continuous mesh-like loop-like entanglements of the stripe is preferably 5 or more and 24 or less, more preferably 10 or more and 20 or less. If it is less than 5 lines / in, the strength is reduced, and if it exceeds 24 lines / in, it is difficult to obtain a uniform network loop.

The fact that the microfibers are substantially bundled means that when the stitching needle pulls out the microfibers, a part of the polyester fiber is slightly mixed and pulled out to form a loop. .

The above-mentioned sewing machine means a marimo-type sewing machine which does not use a warp or a weft, and the present inventors have proposed a nonwoven fabric structure obtained by a conventional needle punch or water jet punch technique. Japanese Patent Laid-Open Publication No. Sho 63-21962 proposes artificial leather having naps using a new entangled structure which is completely different from that of Japanese Patent Application Laid-Open No. 63-21962. However, they have poor resilience and tend to wrinkle, and need to be improved one step. However, they have found that the above-mentioned fiber entangled structure can solve the problem.

In order to further increase the entanglement or make the surface denser, the fiber entangled body may be subjected to an entanglement treatment such as a needle punch or a water jet punch. In addition, as long as the effects of the present invention are not impaired, a plurality of webs or the fiber entangled layers (A) / (B) of the same fiber or other fibers as the loop-forming fibers are formed on the loop-shaped surface of the fiber entangled body. The layers may be laminated and subjected to an entanglement treatment such as a needle punch or a water jet punch.

In the present invention, rebound resilience and dimensional stability are imparted by subjecting the fiber entangled structure to a heat treatment in an atmosphere at or above the secondary transition temperature of the polyester fiber. As the temperature, it is preferable that the treatment is performed in an atmosphere of 20 ° C. or more, more preferably 40 ° C. or more than the secondary transition temperature of the polyester, specifically, preferably 92 to 230 ° C., more preferably 120 ° C. or more. , 200
It is better to process at a temperature of not more than ℃ The heating means may be either dry heat or wet heat. The rate of exposure to the atmosphere and the rate of cooling may be rapid or slow, but the former gives a preferable result.

When conjugate fibers are used to obtain ultrafine fibers, if the melting point of the component for removing the conjugate fibers falls within the above temperature range, the conjugate fibers in the fiber entangled structure are heated in advance to 90 ° C. or more. It is preferable that the material is made extremely fine by chemical or physical treatment so as not to be applied, and then heat-treated at a second transition temperature or higher. Further, in order to make the texture of the final product more flexible, terephthalic acid and ethylene glycol are mainly used as the components for removing the composite fiber, and 6 to 12 with respect to the total acid content.
Using a copolyester containing at least one selected from the group consisting of mol% of 5-sodium sulfoisophthalate acid and 0 to 10 mol% of isophthalic acid, ultra-fine treatment in a process after heat treatment at a second transition temperature or higher. Is preferred. That is, the polymer elastic body is applied after the heat treatment described below, and in the step after coagulation, the microfine fiber and the polymer elastic body are substantially treated by treating with a heated alkali solution and performing ultrafineness. The polyester fiber of the fiber entangled layer (B) becomes non-adhesive and is appropriately alkali-reduced, which is preferable for softening the texture of the final product.

The heat-treated fiber entangled structure may be subjected to a densification treatment or a polyvinyl alcohol, aqueous polyurethane solution or the like to maintain its form, if necessary, through a heated press roll or the like. Next, a polymer elastic body is provided to these fiber entangled structures. Polyether-based, polyester-based,
Polyurethanes such as polyester / polyether copolymers and polycarbonates, or resins known per se such as polyvinyl chloride, polyacrylate, butadiene-styrene, nitrile and chloroprene synthetic rubbers and natural rubbers Can all be used.

From the viewpoint of the feeling and durability of the product, polyurethane resins such as polyether, polyester, polyester / polyether copolymer, and polycarbonate are particularly preferably used. As a removal component,
As the polymer elastic body when the above-mentioned copolymerized polyester is used, a polyurethane-based resin such as a polyether-based resin and a copolymer-based or polycarbonate-based resin is particularly preferable in consideration of alkali resistance.

These resins are adjusted to an appropriate concentration, and the entire fiber-entangled structure is immersed in the resin and impregnated with the resin, or applied by a method such as reverse roll coating, gravure coating, or knife coating. Allow to solidify. Of course, if necessary, a coloring agent, an antioxidant, an antistatic agent, a dispersant, a softener,
Even if additives such as a coagulation regulator, a flame retardant, an antibacterial agent and a deodorant are blended and imparted, the effects of the present invention are not impaired.

Thereafter, the non-stitch-like loop-shaped entangled surface of the fiber entangled structure is subjected to a raising treatment. As such a raising method, a dry buffing method using a sandpaper, a brush, a grindstone or the like or a wet buffing method can be used.

When the above-mentioned copolymerized polyester is used as a removing component, after the elastic polymer is imparted, ultrafineness is achieved by dissolving and removing the copolymerized polyester using hot water and hot water of caustic soda, and one of the polyester fibers is removed. After performing a partial weight loss treatment, perform a brushing treatment, then dye,
By performing the finishing treatment, the artificial leather having raised hairs of the present invention having rebound resilience, hardly wrinkling, improved dimensional stability and abrasion resistance can be obtained. A woven fabric, a knitted fabric, a film, or the like may be integrally attached to the non-piled surface of such artificial leather to add product strength.

In the method of the present invention, the birefringence is a value measured by a Senarmont method and a convensator method using D-line color light with a Na bulb.

[0026]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples. However, the validity and the scope of rights of the present invention are limited thereby.
There is no restriction. Rather, they bring about the following applications and developments.

Example 1 Fiber thickness of polyethylene terephthalate 1.0 d
staple (A) and polyethylene terephthalate (I) with tex, cut length of about 38 mm, and shrinkage of about 15 peaks / in.
V = 0.72), spinning temperature 285 ° C., take-off speed 3
Birefringence melt-spun at 100 m / min is 45 × 10 ^-3
Converge 60D-48f filament, cut length about 5
A staple (B) having a length of 1 mm and a shrinkage of about 12 peaks / in was prepared. The staples were separately passed through a card cross wrapper (A) = 100 g / m ² , (B) = 50 g / m
We were prepared of m ² web. This web is laminated and placed on a marimo-type sewing machine having stitching needles so that the stitching needles pierce from the web (B) side. The stitch length is 1.3 mm using a needle gauge of 18 needles / in. After processing, the fibers forming the web layer (A) penetrate in the thickness direction of the web layer (B) in the form of a bundle, and the penetrating fiber bundle is vertically oriented on the non-laminated surface of the web layer (B). A stitch-like loop-shaped entanglement of 18 filaments / in was continuously formed into a sheet having a knitted shape on one surface and a nonwoven fabric shape on the other surface.

After lightly needle-punching the nonwoven fabric surface of this sheet, the sheet is treated in hot air at 150 ° C. for 50 seconds, and further passed through a press roll heated to 90 ° C. to give a basis weight of 230 g / g.
m ² sheets were obtained. The sheet was immersed in a polyvinyl alcohol solution, impregnated so that the solid content per sheet was 20 parts, and dried.

Next, this sheet is impregnated with an ester / ether-based polyurethane solution so that the solid content per fiber becomes 30 parts, wet coagulated, desolventized in hot water, and dried. A sheet in which a polymer elastic body was provided to a fiber entangled body composed of 67 parts of 0 dtex ultrafine fibers and 33 parts of polyester fibers was obtained.

Next, the sheet is placed on a paper mesh 1
A nonwoven stitch-like loop-shaped entangled surface was raised with a buffing device equipped with 80C / # to prepare a greige fabric. Using a circular type liquid jet dyeing machine, the greige was dyed with a black disperse dye at 120 ° C. for 45 minutes, and a finishing agent was applied.
After passing through a tumbler kneader, drying and softening were performed simultaneously. The thus obtained product is obtained by laminating a polyester fine fiber entangled layer and a polyester fiber entangled layer, polyurethane is provided in these entangled layers, and the polyester fine fibers are bundled to form a polyester fiber entangled layer. The layer penetrated in the thickness direction, the stitch-like loop-like entanglement was continuously formed in the vertical direction on the non-laminated surface of the polyester fiber entangled layer, formed in stripes, and the other surface had nap on the surface of the ultrafine fiber. The artificial leather was resilient and hard to wrinkle, was thin, and had little abrasion resistance and little dimensional change even in dry cleaning.

Example 2 Polyethylene terephthalate in the island component, polystyrene in 55 parts and the sea component, fiber thickness of 3 dtex consisting of 45 parts,
A staple (A) of a composite fiber having 36 island component fibers, a cut length of about 51 mm, and a shrinkage of about 12 ridges / in, and a staple (B) used in Example 1 were prepared. Pass the staples separately through a card cross wrapper (A) = 16
0 g / m ² , (B) = 50 g / m ² , and passed through a marimo-type sewing machine having stitching needles in the same manner as in Example 1, and passed through the web layer (A) in the thickness direction of the web layer (B). ) Is formed in a bundle and penetrates, and the penetrating composite fiber bundle forms a continuous stitch-like loop of 18 filaments / in in the vertical direction on the non-laminated surface of the web layer (B). Then, a sheet formed in a stripe shape with one surface being a knitted shape and the other surface being a nonwoven fabric was produced.

After lightly punching the nonwoven fabric surface of the sheet, the sheet was treated in hot air at 120 ° C. for 40 seconds, and further passed through a press roll heated to 90 ° C. to obtain a basis weight of 260 g / g.
m ² sheets were obtained. This sheet was immersed in a polyvinyl alcohol solution, impregnated so that the solid content per sheet was 15 parts, and dried.

Then, the operation of immersing in a trichlorethylene solution and pressing with a mangle was repeated to remove the polystyrene and dried, and the sheet was impregnated with an ester / ether-based polyurethane solution so that the solid content per fiber resistance was 32 parts. And wet coagulation, desolvation in hot water, depolyvinyl alcohol treatment and drying, 0.05 dtex
A sheet obtained by adding a polymer elastic body to a fiber entangled body composed of 64 parts of ultrafine fibers and 36 parts of polyester fibers was obtained.

Next, the sheet is placed on a paper mesh 1
A nonwoven stitch-like loop-like entangled surface was raised by a buffing apparatus equipped with 80C / # to prepare a greige machine. The greige was dyed with a black disperse dye at 120 ° C. for 45 minutes using a circular type liquid jet dyeing machine, and after applying a finish, the greige was passed through a tumbler kneader, followed by drying and softening at the same time. . The thus obtained product is obtained by laminating a polyester fine fiber entangled layer and a polyester fiber entangled layer, polyurethane is provided in these entangled layers, and the polyester fine fibers are bundled to form a polyester fiber entangled layer. The layer was penetrated in the thickness direction, the stitch-like loop-like entanglement was continuously formed in the vertical direction on the non-laminated surface of the polyester fiber entangled layer, and formed in the form of a stripe. It was artificial leather that was soft on thin ground, had moderate rebound resilience, hardly wrinkled, had abrasion resistance, and had little dimensional change even in dry cleaning.

Example 3 The island component was polyethylene terephthalate (IV = 0.6
9), 55 parts and 5 mol of 8 mol% of the sea component to the total acid component
Polyester obtained by copolymerizing sodium sulfoisophthalic acid and 1 mol% of isophthalic acid, a composite comprising 45 parts of a fiber having a thickness of about 3 dtex, 36 island component fibers, a cut length of about 51 mm, and a shrinkage number of about 12 peaks / in. A fiber staple (A) and a polyester fiber staple (B) used in Example 1 were prepared.

The staples were separately passed through a card cloth wrapper (A) = 170 g / m ² , (B) = 50 g
/ M ² . This web is laminated and placed on a marimo-type sewing machine having stitching needles so that the stitching needles pierce from the web (B) side. The stitch length is 1.3 mm using a needle gauge of 18 needles / in. processed.

After lightly needle-punching the nonwoven fabric surface of this sheet, the sheet was treated in hot air at 150 ° C. for 50 seconds, and further passed through a press roll heated to 90 ° C. to give a basis weight of 270 g / g.
m ² sheets were obtained. This sheet was impregnated with an ether-based polyurethane solution so as to have a solid content of 42 parts per fiber-resistant fiber, wet-coagulated, desolventized in hot water, and dried.

Next, immersion and mangle squeezing are repeated for 20 minutes at a concentration of 0.9% by weight of a soda solution at a temperature of 90 ° C. to remove sea components, neutralize, wash with hot water and dry, and add 0.05 dtex. A sheet was obtained in which a polymer elastic body was added to a fiber entangled body composed of 65 parts of ultrafine fibers and 35 parts of polyester fibers.

Next, the sheet was placed on a paper mesh 2
A nonwoven stitch-like loop-shaped entangled surface was raised with a buffing device equipped with 40C / # to produce a greige fabric. The greige was dyed with a black disperse dye at 120 ° C. for 45 minutes using a circular type liquid jet dyeing machine, and after applying a finish, the greige was passed through a tumbler kneader, followed by drying and softening at the same time. .

The product thus obtained is obtained by laminating a polyester fine fiber entangled layer and a polyester fiber entangled layer,
Polyurethane is provided in these entangled layers, and the polyester ultrafine fibers are bundled and penetrate the polyester fiber entangled layer in the thickness direction, and the non-laminated surface of the polyester fiber entangled layer is stitch-like in the vertical direction. Looped intertwined continuously, formed in stripes, the other side of the microfiber surface is soft, thin with naps, moderate rebound resilience, hard to wrinkle, abrasion resistance, dimensions in dry cleaning It was an artificial leather with little change.

Comparative Example 1 The staple (A) of the conjugate fiber used in Example 2 was passed through a card / cloth wrapper to produce a web having a basis weight of 320 g / m ² . This web is passed through a marimo-type sewing machine under the same conditions as in Example 1 to penetrate the composite fiber in a bundle direction in the thickness direction of the web layer. A stitch-like loop-shaped entanglement of 18 filaments / in was continuously formed in the direction, and a sheet was formed in one side, which was formed into a knitted shape and the other surface was formed into a nonwoven fabric.

This sheet was lightly needle-punched, contracted in hot water, squeezed with a mangle, and dried. This sheet was immersed in a polyvinyl alcohol solution, impregnated so that the solid content per sheet was 12 parts, and dried. Next, the operation of immersing in a trichlorethylene solution and squeezing with a mangle is repeated, the polystyrene is removed and dried, and this sheet is impregnated with an ester / ether-based polyurethane solution to a solid content of 28 parts per fiber-resistant fiber, and wet The solidified product was subjected to a solvent removal and a polyvinyl alcohol treatment in hot water and dried to obtain a sheet in which a polymer elastic body was added to a fiber entangled body made of 0.05 dtex ultrafine fibers.

Next, the sheet is subjected to buffing, dyeing, and finishing in the same manner as in Example 2 to provide a polyester fine fiber entangled layer and polyurethane in the entangled layer, and the microfine fibers are bundled. The fine fiber entangled layer penetrates in the thickness direction, and a stitch-like loop-like entanglement is continuously formed in one direction on one surface of the fine fiber entangled layer in a stripe shape, and the other surface is nap of the fine fiber. Was obtained.

Although this artificial leather product was thin and had flexibility and abrasion resistance, the resilience and dimensional stability were inferior to those of Example 1.

Comparative Example 2 The staple (A) of the conjugate fiber of Example 2 and polyethylene terephthalate (IV = 0.7
Using 2), a spinning temperature of 285 ° C. and a take-up speed of 1000 m /
160D-4 having a birefringence of 12 × 10 ^-3 melt-spun in minutes
The 8f filament was converged, and a staple (B) having a cut length of about 51 mm and a shrinkage of about 12 peaks / in was prepared.
The staples were separately passed through a card / cloth wrapper to produce a web of (A) = 160 g / m ² and (B) = 50 g / m ^2. Thereafter, the same treatment as in Example 2 was carried out to obtain a polyester fine fiber. An entangled layer and a polyester fiber entangled layer are laminated, polyurethane is provided in these entangled layers, and ultrafine fibers of polyester are bundled to penetrate the polyester fiber entangled layer in the thickness direction, and the polyester fiber A stitch-like loop-like entanglement was continuously formed in the vertical direction on the non-laminated surface of the entangled layer in the form of stripes, and an artificial leather was obtained in which the other fine fiber surface had naps. This artificial leather product had flexibility and abrasion resistance on a thin ground, but was inferior to Example 1 in resilience and dimensional stability.

[0046]

The artificial leather of the present invention has a stitch-like loop entanglement of an ultrafine fiber bundle and a three-dimensional entanglement of an ultrafine fiber and a polyester fiber having rebound resilience. Artificial leather with excellent rebound resilience, dimensional stability, and abrasion resistance.
It is also applicable to the material field. In addition, the artificial leather of the present invention can also expose a stitch-like loop-like entanglement that is continuous in the vertical direction on one side, so that even if it directly touches bare skin without using a lining, it has a good slip, An artificial leather that is difficult to fray can be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F055 AA01 BA10 BA12 BA16 CA15 EA04 EA11 EA23 EA24 EA27 EA34 FA15 GA01 4L032 AA06 AB04 AB05 AC01 BD05 DA01 EA00 4L047 AA21 AA27 AB08 BA03 BA06 BA09 BB09 CA02 CB01 CB00

Claims (8)

[Claims] 1. A web layer (A) composed of ultrafine fibers of 1.5 dtex or less, and a melt spinning speed of 2000 to 4000 m /
A polyester fiber web layer (B) having a birefringence of 20 × 10 ^{−3 to} 100 × 10 ⁻³ , but not subjected to a stretching treatment and a heat treatment at a temperature not lower than the secondary transition temperature, (A) / (B) = 20/80 to 90/10% by weight, and then passed through the following steps (1) and (2), and then the following steps (3), (4) and (5) A) a method for producing artificial leather having naps, wherein the treatment is performed in the order of (1) Step of needling through a sewing machine having stitching needles so that a stripe-shaped stitch-like loop entanglement is formed on the non-laminated surface of the laminated web layer (B). (2) Web 2 of polyester fiber forming layer (B)
Step of performing a heat treatment at a temperature equal to or higher than the next transition point temperature (3) Step of providing an elastic polymer (4) Step of raising the brush. (5) Dyeing and finishing process 2. The method for producing artificial leather having naps according to claim 1, wherein a step of performing a densification treatment is interposed between the steps (2) and (3). 3. The method according to claim 1, wherein the web layer (B) has a melt spinning speed of 250.
30 × 10 ^-3 -60 picked up at 0-3500 m / min
3. The method for producing artificial leather having naps according to claim 1 or 2, which is a polyester fiber having birefringence of ^10-3 . 4. The raised hair according to any one of claims 1 to 3, wherein the heat treatment performed at a temperature equal to or higher than the secondary transition point of the polyester fiber is performed by exposing to an atmosphere of steam or dry heat at 90 to 230 ° C. Manufacturing method of artificial leather. 5. The method according to claim 1, wherein said polyester fiber is made of polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate or a copolymer thereof. 6. The method according to claim 1, wherein the web layer (A) is formed of a composite fiber which can be made ultrafine, and has been subjected to ultrafine treatment before heat treatment at a second transition temperature or higher. ~ 5
The method for producing artificial leather having raised hair according to any one of the above. 7. The component for removing the ultrafine composite fibers forming the web layer (A) is mainly composed of terephthalic acid and ethylene glycol, and is 6 to 10 parts by weight based on the total acid content.
7. The nap of claim 1, comprising a copolymerized polyester containing at least one selected from 12 mol% of 5-sodium sulfoisophthalate acid and 0 to 10 mol% of isophthalic acid. 8. Manufacturing method of artificial leather. 8. The nap according to claim 1, wherein the web layer (A) is subjected to ultra-fine treatment in a step after heat treatment at a temperature equal to or higher than the second transition temperature. A method for producing artificial leather.