JP3133159B2 - Structure for leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel leather structure having a leather-like feeling.

[0002]

2. Description of the Related Art Conventionally, an artificial suede obtained by dyeing, finishing, and processing a leather structure in which ultra-short fibers are entangled through a coarse woven or knitted fabric is known in Japanese Patent Application Laid-Open No. 52-107368. For example, a trademark Ramose manufactured by Asahi Kasei Corporation is known. However, Japanese Patent Application Laid-Open No. 57-82583
JP, JP-A-58-12639, JP-A-53-12
The structure of the conventional product as disclosed in the 2869 publication has a limit in flexibility because the single fiber fineness of the fibers used in the woven or knitted fabric is as large as 0.6 to 3 denier. In addition, conventional products have a different single-fiber fineness used in the woven or knitted fabric and the ultra-fine short fibers entangled with the dyes, and therefore have different dye adsorbing properties. In the case of products, there was a problem that the color was uncomfortable, and the worn parts were noticeable.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a natural leather-like, soft and drape-like texture without color spots.
It is an object of the present invention to provide a novel structure for leather from which a leather-like object with less noticeable surface wear can be obtained.

[0004]

In other words, the present invention relates to a structure in which a woven fabric or a knitted fabric is entangled with ultra-fine short fibers of 0.5 denier or less, wherein the fibers constituting the woven fabric or the knitted fabric are not less than 0.5%. The above-mentioned structure is composed of ultra-fine fibers of 5 denier or less, and the above-mentioned structure is formed by integrating ultra-fine short fibers of 0.5 denier or less on both surfaces of the intermediate layer with a woven or knitted fabric as an intermediate layer to constitute a woven or knitted fabric. This is a structure for leather, characterized in that the fibers to be formed and the ultrafine short fibers are made of the same material. The woven or knitted fabric used in the present invention needs to be constituted by ultrafine fibers of 0.5 denier or less.

[0005] In the case of woven fabrics, ultrafine fibers are used for both warp and weft, or warp or weft. The use of ultrafine fibers for both the warp and the weft is optimal and particularly preferred for obtaining a natural leather-like feel. When ultrafine fibers are used only for the warp or the weft, the bendability in the warp direction and the weft direction are different, and a leather-like product having interesting characteristics is obtained.

[0006] In the case of knitted fabrics, it is particularly preferable to use 100% ultrafine fibers because the texture is closest to that of natural leather. Hardness can be imparted to the woven or knitted fabric by mixing fibers having a normal thickness of 0.5 denier or more other than ultrafine fibers into the woven or knitted structure. However, as the amount of fibers having a normal thickness of 0.5 denier or more increases, the leather-like texture approaches the fabric-like texture. Therefore, if the amount of fibers having a normal thickness of 0.5 denier or more is too large, the purpose of the present invention is deviated.

[0007] The amount of fibers having a normal thickness of 0.5 denier or more is preferably at most 50%, and more preferably 3%.
It is preferably 0% or less. In the woven or knitted fabric used in the present invention, the thickness of the single fiber of the ultrafine fibers is 0.5 denier or less.
It is preferable to use ultrafine fibers of denier or less.

The material of the woven or knitted fabric used in the present invention includes:
Any material such as polyester, polyamide, and acrylic can be used, but the same material as the ultrafine short fibers to be entangled is preferable in consideration of the same color in dyeing. The structure of the woven fabric is not particularly limited, such as plain weave and twill weave, and the knitted material is not particularly limited, such as circular knit and tricot.

The ultra-fine short fibers to be entangled used in the present invention are not particularly limited, such as polyesters, polyamides, and acrylics, and any fibers can be used. The thickness is preferably 0.5 denier or less, and more preferably 0.2 denier or less in order to obtain a leather-like suede surface or a soft feeling. There are various methods for producing the leather structure of the present invention, and for example, it can be produced by the following method. (1) First, a woven or knitted fabric is made using ultrafine fibers having a single fiber fineness of 0.5 denier or less. (2) Ultrafine fibers having a single fiber fineness of 0.5 denier or less are cut into short fibers. (3) Using a papermaking machine, a three-layer structure sheet in which ultrafine short fibers are arranged on both sides of a woven or knitted fabric is produced. Next, the ultrafine fibers and the woven or knitted fabric are three-dimensionally entangled by a water jet to obtain an integrally structured leather structure.

[0010] The leather structure thus obtained is subsequently impregnated with polyurethane and dyed, and a suede-like leather-like material or a surface layer after impregnation with polyurethane is further provided with a polyurethane coating layer. It can be a grainy leather-like material. The polyurethane coating layer for forming a grainy surface is preferably formed by coating a polyurethane solution or an aqueous dispersion emulsion.

The leather structure of the present invention can be provided with a rubber-like substance such as polyurethane to prevent hair loss. For example, a polyether polyurethane represented by polytetramethylene glycol, a polyester polyurethane represented by polybutylene adipate and a polycarbonate polyurethane are preferably used, and a solution or an aqueous dispersion emulsion thereof is impregnated into a structure, It can be applied by wet or dry coagulation. In this case, the amount of the polyurethane to be applied is preferably 40% or less based on the weight of the fiber, and in order to obtain the desired texture of the present invention, the amount of the polyurethane is preferably small, more preferably 10% or less. .

The leather structure of the present invention can be dyed to obtain a leather-like final product. The first feature of the leather structure of the present invention is that a leather-like material having a very soft texture is obtained. Since natural leather has a structure in which only microfibers are branched and entangled, the texture is extremely soft. In addition, it is plastically deformed with respect to deformation. For example,
If you crush natural leather by hand, it will be retained in its original form and will not recover. After that, it can be easily restored to its original shape by spreading it by hand. Such properties are unique to natural leather and different from fabrics. Such properties can be obtained because natural leather is composed of an entangled body composed of only ultrafine fibers.

On the other hand, a leather-like material in which a woven or knitted fabric is used as an intermediate layer and microfine short fibers are three-dimensionally entangled has a natural suede-like appearance because the surface is composed of microfine fibers. The texture that is said to be drapable is inevitably a fabric-like texture because the texture of the woven or knitted fabric in the middle layer appears as the texture of the leather-like material.
However, it has been found that when the woven or knitted fabric using the ultrafine fibers is the intermediate layer, a natural leather-like feeling is obtained instead of a fabric-like feeling. This is one of the major features of the present invention.

Another feature of the present invention is that ultrafine short fibers entangled with a woven or knitted fabric can be dyed in the same color when dyeing. In the case of a structure for thin leather, that is, when the amount of the ultrafine short fibers used is small relative to the woven or knitted fabric, the color of the woven or knitted fabric is not changed unless the intermediate layer of the woven or knitted fabric and the ultrafine short fibers are dyed in the same color. It appears on the surface and does not have a predetermined color tone, and it also gives a sense of discomfort. In addition, when a part of the woven or knitted fabric is exposed on the surface due to abrasion of the ultrafine short fibers, even a small abrasion portion becomes very noticeable when the color is different. The present invention has solved this problem, and the woven or knitted fabric can be dyed in the same color if the microfibers that are entangled with the same material have an approximate thickness.
The above problem is solved.

[0015]

The present invention will be described in more detail with reference to the following examples. The physical properties were measured by the following methods. (1) Flexibility JIS L1096 45 ° cantilever method. MD
Average value of (length direction) and CD (width direction). (2) Wrinkle resistance JIS L1096 A method (wire method). Average value of MD (length direction) and CD (width direction).

[0016]

EXAMPLE 1 A plain woven fabric was obtained by using 100 denier / 1000 filament false twisted polyester ultrafine fibers for warp and weft. The weaving density was 55 lines / inch and the basis weight was 80 g / m ² in both processes. The fabric was relaxed in hot water of 90 ° C. or higher, and set to a predetermined width by a setter. Using a papermaking machine, a three-layer structure sheet was prepared in which the obtained woven fabric was used as an intermediate layer and ultra-fine short fibers were arranged on both sides.
As the ultrafine fibers, polyester having a denier of 0.1 and a length of 5 mm was used. The weight of the ultrafine short fibers on both sides of one layer and three layers was 50 g / m ² .

Next, the pressure 45 ejected from many nozzles
The three-layer structure sheet was entangled with a water flow of kg / cm ² to form an integral structure for leather. Then, it is impregnated in water-dispersed polyurethane and dried to obtain a solid content of 5%.
% Of polyurethane was obtained. This was dyed and reduced under normal polyester conditions to obtain a leather-like product.

The obtained leather-like material is extremely soft, and when squeezed with a hand, is kept in its original shape and does not recover to its original shape, but is easily returned to its original shape when spread by hand. It behaved very similar to the properties of
Further, the urethane-impregnated sheet obtained next was used as a sumika.
Using a disperse dye of lon Red S2GF, it was dyed with a circular dyeing machine at 130 ° C. for 1 hour at a bath ratio of 1/30. 80 ° C using thiourea dioxide and NaOH,
After reducing and washing for 30 minutes, a leather-like material colored red was obtained.

Next, the leather-like material was abraded with a Martindale abrasion tester. At the time of 20,000 wears with a load of 9 KPA, the woven fabric embedded in the inner intermediate layer was partially exposed on the surface. However, since the fibers of the exposed woven fabric and the ultra-fine short fibers were the same color, there was no unusual feeling particularly at the exposed portions. In addition, if not carefully observed, it was not understood that the fabric was exposed on the surface.

Table 1 summarizes the evaluated feelings and the like.

[0021]

[Comparative Example 1] The above-mentioned example was conducted except that a 100 denier / 48 filament polyester fiber having a normal thickness was used as a warp and a weft, and a woven fabric having a density of 55 / inch and a basis weight of 80 g / m ² was used. A structure for leather was obtained under the same conditions as in Example 1, and then a leather-like product was obtained.

The obtained leather-like product had a rebound resilience more than that of the above-mentioned Example 1, and had a texture similar to that of a fabric. Next, dyeing was performed under the same conditions as in Example 1 above.
After reduction washing, a leather-like material colored in red was obtained. Further, the obtained leather-like article was subjected to an abrasion test under the same conditions as in Example 1 above. At the time of 20,000 times of wear, the woven fabric embedded in the inner intermediate layer is partially exposed on the surface, and the fibers of the woven fabric are dyed darker red than the ultrafine short fibers. It was a big thing.

Table 1 shows the feeling of this product.

[0024]

Example 2 Using the urethane impregnated sheet obtained in Example 1, the surface was buffed with emery paper, and then a 20% solution of dimethylformamide (hereinafter, referred to as DMF) of a polyethylene adipate polyurethane was gravure rolled. After coating, it was wet-solidified in water to form a foam coating layer.

Next, a 25% solution of the polyurethane used above in DMF was gravure coated on the coating layer, and the DMF was evaporated to dry solidify. Further, pressing was performed with a heated embossing roll to form a natural leather-like grain, which was lightly rubbed and finished. The grainy leather-like material thus obtained was extremely soft, and when squeezed by hand, formed wrinkles like natural leather, and was retained in its original form and did not recover. When it was spread by hand, it exhibited a unique behavior that easily returned to its original shape. The hand data of this product is shown in Table 1.

[0026]

Example 3 Ultrafine short fibers were arranged on both sides of a knitted product using a papermaking machine to prepare a three-layer structure sheet. The knitted fabric used was 100 denier / 1000 filament, ultra-twisted polyester ultrafine fibers. Using a 28-gauge circular knitting machine, an inner fabric having a basis weight of 80 g / m ² was prepared. As the ultrafine fibers, polyester having a denier of 0.1 and a length of 5 mm was used. The basis weight of both sides of the three-layered sheet is 50 g / m ^{2 for one} layer and for the three layers.
Met.

Next, the fabric was entangled in exactly the same manner as in Example 1 to obtain an integral structure, a structure for leather, and a leather-like product.
The obtained leather-like material is extremely flexible, and when squeezed by hand, retains its shape and does not recover its original shape,
The behavior was very similar to that of natural leather, as it easily returned to its original shape when spread by hand. In addition, the obtained leather-like material is dyed in the same color for both ultra-fine short fibers and knitted fabrics.Even if the ultra-fine short fibers are abraded to expose the intermediate layer, there is no sense of incongruity in color, and it is possible to distinguish worn parts. I could not do it. The feeling data of this is shown in Table 1.

[0028]

[Comparative Example 2] A structure for leather was produced under exactly the same conditions as in Example 3 except that a fiber having a normal thickness of 75 denier / 36 filament was used and the basis weight of the knitted fabric was 60 g / m ^2. I got something. The obtained leather-like material had a rebound resilience more than that of the above-mentioned Example 3, and had a texture similar to that of a fabric. The color of the knitted fabric and the ultra-fine short fiber were different, and the knitted fabric was darker. Table 1 shows the value of hand.

[0029]

Example 4 A three-layer sheet was prepared by arranging ultrafine short fibers on both sides of a woven fabric using a papermaking machine. Warp of woven fabric is 10
0 denier / 48 filament false-twisted polyester fiber, weft yarn is 105 denier / 750 filament false-twisted polyester ultra-fine fiber, and weave density is 55 yarns / inch for both weft and 80 g / m ^{2 in} basis weight. used. Relax this fabric in hot water of 90 ° C or higher,
The width was set to a predetermined value with a 180 ° C. setter.

The ultra-fine short fiber is 0.15 denier and 5 m long
m of polyester was used. The basis weight of the three-layered sheet was 25 g / m ² for all three layers. Next, the three-layer structure sheet was entangled with a water flow having a pressure of 60 kg / cm ² ejected from a number of nozzles to form an integrated structure, thereby forming a structure for leather. Next, this structure for leather was impregnated in a water-dispersed polyurethane, and dried to obtain a urethane-impregnated sheet containing 7% polyurethane by solid content. This was dyed and reduced under ordinary polyester conditions to obtain a leather-like product. The obtained leather-like material had different bending easiness in the warp and weft directions, and was more easily bent in the warp direction. Table 1 summarizes the feeling values.

[0031]

Example 5 A three-layer structure sheet was prepared by arranging ultrafine short fibers on both sides of a knit using a papermaking machine. The knitted fabric used was a polyester fine fiber of 105 denier / 750 filament and a polyester fiber of 100 denier / 48 filament. The ratio of the former and the latter is 80:20 and 2
An 8-gauge circular knitting machine was used to make a sheet of jersey with a basis weight of 80 g / m ² . As the ultrafine short fibers, 0.15 denier and 5 mm long polyester were used. The basis weight of the sheet is 25 for both one layer and three layers
g / m ² .

Next, the pressure 60 ejected from many nozzles
The three-layer structure sheet was entangled with a water flow of kg / cm ² to form an integral structure, which was used as a structure for leather. Next, a urethane-impregnated sheet was obtained in the same manner as in Example 4 to obtain a leather-like material.
This was slightly more resilient than the one obtained in Example 2, but had a good feel. Table 1 shows the value of hand.

[0033]

[Table 1]

[0034]

According to the structure for leather of the present invention, it is possible to obtain a very soft and drape-like leather-like material similar to a conventional structure having a deformation of a characteristic of natural leather. it can. In addition, in the case of thin fabrics, the knitted fabric and the ultrafine fibers can be dyed in the same color, so that a natural leather-like product having a unique effect that the feeling of discomfort in color and the problem of exposure of the intermediate layer due to surface wear are less noticeable is obtained. be able to.

Claims (1)

(57) [Claims] 1. A woven or structure knitted and 0.5 denier or less of ultrafine short fibers are entangled, fibers constituting the woven or knitted fabric is 0.5 denier or less of ultrafine fibers, the structure Is a woven or knitted fabric as an intermediate layer
Ultra-fine short fibers of 0.5 denier or less on both surfaces of the intermediate layer
Fibers that are woven or knitted
A structure for leather, wherein the fibers and the ultrafine fibers are made of the same material .