JPS5924236B2 - Leather-like sheet material and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nubuck-like or suede-like leather-like sheet material having ultrafine fiber fluff on its surface, and in particular has a high surface fluff density, an elegant appearance, and a soft, lightweight, favorable appearance. The present invention relates to an improved leather-like sheet material that has a high mechanical strength and a sufficient mechanical strength, and a method for producing the same.

A suede-like leather-like product is obtained by laminating fleece made of ultrafine fibers on a knitted fabric, making this into an integral entangled body by colliding with columnar running water, impregnating this with polyurethane resin, coagulating it, and subjecting it to an inner fluffing treatment. has already been proposed.

(JP 52-107368, JP 53-31866,
(Japanese Unexamined Patent Publication No. 53-122869, etc.) However, the intertwined body of microfine fiber fleece has an extremely high density, and as a result, the resulting product is heavy and hard, and is inferior in comfort.

In addition, if you design with these drawbacks in mind and reduce the amount ratio and thickness of the ultra-fine fiber fleece, in this case, the amount of surface fluff will be insufficient and the filled polyurethane will be visible, causing a patchy feeling. The suede effect may not be as good as the original suede effect.

The present invention provides a suede-like leather-like sheet material that has improved these drawbacks.

That is, the present invention is a knitted fabric in which an intertwined layer (5) of ultrafine fibers of 0.5 denier or less and another intertwined fiber layer (B) exist between the two layers (intertwined with each other via Q). It consists of an integrated laminated entangled body and an elastic polymer filled in the voids of the laminated entangled body, and has fluff made of ultrafine fibers constituting the entangled body layer (5) on the surface of the interlaced body layer holes. , and the interlaced body layer (
The apparent density of A) is 0.159/i or more, the entangled body layer (B)
This is a leather-like sheet material characterized by having an apparent density of less than 0.15 g/i.

Also, its manufacturing method.

The interlaced body layer (5) in the present invention has a single yarn denier of 0.5
It consists of an aggregate of ultrafine fibers of denier or less,
Its basis weight is 20-200g, preferably 40-100g
/d is preferred.

It is necessary that the fiber denier is 0.5 denier or less.

That is, in the present invention, the fibers that are fluffed on the product surface are fibers that form interlaced layer holes, and the denier of the constituent fibers is a decisive factor in providing a suede-like touch and appearance, especially an excellent lighting effect. and 0.
If it exceeds 5 denier, it will not be possible to obtain the excellent suede-like leather-like sheet that is the object of the product of the present invention.

As the fibers constituting the holes in the entangled body layer of the present invention, known synthetic fibers such as polyester, nylon, and acrylic fibers, or recycled fibers such as rayon, cupro, and acetate are suitably used.

Various known methods can be applied to apply these ultrafine threads to water droplets.

Most preferably, an ultrafine fleece produced by melt blowing is used as the raw material for the entangled body layer (5).

Further, preferably, paper-made fleece obtained by paper-making an aqueous dispersion of ultrafine short fibers directly spun or dry fleece produced by a carding method are also good raw materials.

The production of ultrafine yarn obtained by direct spinning is, for example, polyester obtained by the spar draw method or acrylic ultrafine yarn obtained by wet spinning from a high concentration stock solution (Japanese Patent Application Laid-Open No. 53-12281).
5), polyester ultrafine yarn produced by rapid cooling method (patent application 52-1)
25747 (Unexamined Japanese Patent Publication No. 54-64119), Patent Application No. 53-
72727 (Japanese Unexamined Patent Publication No. 55-26201)).

Furthermore, latent ultrafine multicomponent yarns such as conventionally known sea-island fibers, mixed fibers, and releaseable fibers can also be applied.

In this case, ultrafine fiber development treatment is required during the process.

These ultrafine fiber layers may be intertwined in advance, or may be intertwined after being laminated with the knitted fabric.

In any case, it is necessary that there be sufficient entanglement between the fibers in the layer and that they be integrated with the intertwined body layer (B) on the back side through the knitted fabric.

That is, even without a binder such as a binder, the entangled body layer (5),
The tangled body layer (B) and the knitted fabric (Q) are integrated and have such an intertwined state that they cannot be easily separated.

The entanglement of the entangled body layer (5) is also important for the amount and nature of the fluff that is raised therefrom.

It is difficult to create sufficient fluff without intermingling,
The quality of the fluff becomes inferior.

The fiber entangled layer (B) in the present invention constitutes the back surface of the sheet-like product.

Its basis weight is 5-150, preferably 10-100g/
cr 1 yen is suitable.

This layer is important in controlling the overall physical properties and texture of the product.

The fibers constituting this can be synthetic fibers such as polyester, nylon, and acrylic, recycled fibers such as rayon, cupro, and acetate, and natural fibers such as cotton.

The denier can be selected depending on the desired physical properties and texture, but in order to obtain a suede-like leather-like texture, it is desirable to use a lower denier, preferably a single yarn denier of 1.0 denier or less. .

Since these fibers exist as a tangled layer, they have appropriate bulkiness and fiber gaps, and when filled with polyurethane, the product exhibits excellent physical properties.

This fiber entangled layer (B) is integrated with the entangled layer (A) via a knitted fabric (Q).

This tangled body layer (B) is formed by forming a known fiber fleece and mechanical fiber entangling treatment in the same manner as the above-mentioned tangled body layer (5).

The knitted fabric (0) in the present invention is embedded inside the sheet-like product of the present invention and is an important component that influences the physical properties such as strength and shape retention of the sheet-like product.

For the purpose of the present invention, the basis weight is 10 to 100. ! ir/m, and has openings such as stitches, textures, and voids that can intertwine with the fibers constituting the aforementioned entangled body layers (4) and (B), and also has openings that meet the purpose. A material with the necessary mechanical properties can be selected.

The basic properties of the sheet-like material of the present invention, such as tensile strength and elongation, tear strength, and bursting strength, are determined by the knitted fabric (Q).

Preferred specific examples include woven fabrics such as plain weave and twill weave, tricot,
Any material that has a reinforcing effect can be applied, such as knitted fabrics such as circular knitting, crossed filament yarns, and bonded fabrics.

The material of the fiber is not particularly limited, and polyester, nylon, acrylic, rayon, cupro, acetate, cotton, etc. can be used.

The elastic polymer filled in the voids of the laminated entangled body of the present invention is
NBR, SBR, polyurethane elastomer, etc. are used.

In particular, polyurethane elastomer is most preferred from the viewpoint of physical properties.

These elastic bodies are applied to the entangled body by a known method, but
In particular, it is desirable to impregnate and apply the organic solvent solution, then immerse it in a non-solvent to remove the solvent, so-called wet coagulation, and apply it in a microporous state.

When using dry coagulation, it can be applied by reducing the amount applied.

The filling rate of the elastic polymer is 10 to 20 for the laminated tangled body.
A suitable content is 0% by weight, particularly preferably 40 to 90% by weight, which provides an excellent feel.

It is also important to control the amount of elastic polymer in order to obtain the soft feel that is the objective of the present invention.

When filling polyurethane elastomer using the wet coagulation method, reducing the amount of polyurethane filled tends to make it more flexible. Generally, it is desirable that the amount is 20% by weight or more (based on the fiber), preferably 40 to 90% by weight.

This indicates that there is a limit to obtaining a more preferable texture by adjusting the filling rate.

In order to solve this problem, we have found that the design of the tangled fiber body serving as the base is extremely effective.

That is, the most distinctive feature of the present invention is the setting of the apparent density of the fibers of the tangled body layer, which will be described below.

In the present invention, the apparent density of the entangled body layers (5) and (B) is the apparent density of the fibers that constitute the entangled body layer,
The apparent density of the entangled body layer is measured by the following method.

The thickness of the sheet product of the present invention is measured under a load of 20 g/(i, and then the elastic polymer is removed by solvent extraction, and the obtained laminated entangled product is sampled in a predetermined area. 5) Layers, (B)
Peel into 3 parts of the layer and (0 knit fabric).

At this time, if the entanglement is strong and separation is difficult, the intertwined points are cut and peeled off.

Next, the weights of layer (5) and layer (B) are measured to obtain the basis weight g/crit.

Separately, take an enlarged cross-sectional photograph of the sheet-like material, and calculate the thickness of both layers in the sheet-like material (5) and (B) based on the total thickness measured previously.

The apparent density of both layers can be obtained by dividing the above basis weight by the obtained thickness.

More simply and accurately, the interlaced body layers (A), (B)
and knitted fabrics (Q) If the amount of raw materials used (fabric weight) is known, it is easy to track thickness changes and area changes during the manufacturing process and measure the thickness composition of the final product. Calculation is possible.

In the present invention, the apparent density of the entangled body layer is 0.15 g/c.
wt or more, the apparent density of the entangled body layer (B) is 0.15 g/d
It is particularly necessary that the

In order to obtain a suede-like leather-like surface, which is one of the objects of the present invention, as mentioned above, the denier of the fibers forming the surface fuzz is 0.5 denier or less, preferably 0.2 denier or less. In addition to that, it turns out that the amount of fluff is extremely important.

In order to increase the amount of fluff on the surface, in the present invention, it has been found that it is most effective to set the apparent density of the entangled body layer to be a dog.

For a product with good appearance, its apparent density should be 0.15.
It has been found that it is particularly effective to set the g/cri or more, preferably 0.18 g/ff1 or more.

A low density will give a poor appearance.

In order to achieve the other object of the present invention, which is a product that is soft and light to wear, has a texture, a feeling of leather-like fullness, and a feeling of elasticity, the entangled body layer (
The apparent density of B) is less than 0.15 g/i, preferably 0.
It has been found that a range of 12 to 0.01 g/ffl is suitable.

In the present invention, by setting the apparent densities of the entangled body layers (4) and (a) to the above-mentioned apparent densities independently, an extremely excellent suede-like appearance that has both an excellent appearance and desirable flexibility and texture can be obtained. A leather-like sheet material was obtained.

Further, in the present invention, the ratio of the thicknesses of the entangled body layer (5) and the entangled body layer (B) is important.

The thickness ratio of (A):(B) is preferably in the range of 1:5 to 3:1, preferably 1:2 to 2:1 in order to fully obtain the effects of the present invention.

If the thickness of the entangled body layer is too thick compared to that of (B), it is difficult to obtain a soft texture.

On the other hand, if it is too small, the appearance will deteriorate, such as insufficient fluffing or the inner knitted fabric appearing exposed.

This ratio can be satisfied by selecting the above-mentioned range of basis weight of each layer.

The leather-like sheet product of the present invention can be produced by various methods.

The entangled body layer is obtained by mechanically intertwining sheets made of ultrafine fibers having a single filament of 0.5 denier or less.

In order to achieve an apparent density of 0.15 g/i or more, it is preferable to apply a high-speed stream of water to the web obtained by the melt blowing method to entangle the web.

A method for manufacturing a web using the melt blowing method is disclosed in Japanese Patent Application Laid-Open No. 1987-
48921 and the like can be applied.

The average fineness of the fibers that make up the meltblown web is 0.1.
In the case of polyethylene terephthalate of ~0.02 denier, the pressure is 30 k from a nozzle with a diameter of 0.2.
When water of y/cr/l is jetted and applied to the entire surface of the web, the apparent density is 0.3~o, B/d.
Becomes the property of

Further, when a polyethylene terephthalate sheet having a 0.2 denier and a cutting length of 5X is subjected to the above-mentioned entangling treatment, a sheet having an apparent density of 0.28 g/i is obtained.

Processing the same <0.1 denier, formed sheet of acrylic fiber to cut length 3 gave an apparent density of 0.397 cd.

The tangled body layer is a tangled body having an apparent density of less than 0.159/u, and is obtained, for example, by interlacing fibers having a normal denier.

Although this material is effective in providing a lightweight feel, it is insufficient in flexibility.

A preferred method is to obtain an entangled layer from multicomponent fibers such as composite fibers and mixed fibers, and extract and remove soluble components during the process.

In this case, it is particularly effective to design the fineness of the component fibers remaining after extraction to be fine denier.

A more preferred method is a method using a mixed paper sheet as a raw material.

Two types of short fibers with different solubility are mixed as a slurry,
This is a method in which a sheet is obtained by papermaking, which is subjected to an entanglement treatment, and then one component is extracted and removed at an appropriate stage of the process.

For example, a mixture of short fibers of polyester, nylon, or acrylic with polyvinyl alcohol fibers that are insoluble in cold water and soluble in hot water is suitable for this purpose.

Any combination of fibers with different solubility will suit this purpose.

In this case, a desired final apparent density can be obtained by adjusting the mixing ratio.

Generally, the mixing ratio of the removed components is preferably 20% or more, preferably 40% or more of the total.

Although the denier of the non-extracted fibers at this time is arbitrary, it is extremely effective to use thin fibers of 0.5 denier or less in obtaining a soft texture.

In the production of the sheet of the present invention, the sheet serving as the raw material described above is made into a knitted fabric (a three-layer sheet with C1 as an intermediate layer, and then preferably made into an integrated entangled laminate by colliding the entire surface with a high-speed columnar water stream) is most suitable.

A specific example of this confounding method is USP3508308.3620
903, etc.

Of course, it is also possible to entangle the sheets in advance, and other entanglements other than columnar water jets may also be used as the entanglement means.

Needle punching can also be used as an interlacing method.

In this case, the knitted fabric of the intermediate layer may be partially damaged, so care must be taken not to lose its reinforcing effect.

The obtained laminated entangled product then undergoes processes such as fluffing, filling with an elastic polymer, and dyeing to obtain the intended leather-like sheet product.

These steps can be sufficiently carried out by employing known methods.

The invention also provides highly favorable advantages for the implementation of these processes.

That is, entangled bodies of melt-blown webs and paper sheets made of ultra-fine yarns provide an excellent suede-like surface as described above, but when the fiber density of these entangled bodies exceeds 0.25, elastic polymers are used. There was a disadvantage that the impregnating property of the material was extremely poor.

Not only is there a productivity problem of slow impregnation speed, but also when adopting a three-layer structure with an intermediate fabric as in the present invention,
The elastic polymer may not be completely filled inside.
There was a problem in that the binding (adhesive bonding) effect by the elastic polymer was insufficient and the peel strength between the layers was weak.

The present invention provides an effective solution to this problem.

The present invention will be explained below by way of examples.

Example 1 Polyethylene terephthalate was spun using the melt blow method, and ultrafine fibers with a distribution of single filament fineness of 0.04 to 0.07 denier were collected on a net, and the fabric weight was 70 jj
／ Got a web prisoner of @'.

Separately from this (: This is 0.3 denier polyester fiber cut to 5% length, a predetermined amount of cold water insoluble hot water soluble single yarn 2 denier, polyvinyl alcohol short fiber to cut length 4) were mixed, and this was made into paper from a water slurry to obtain a sheet (B) having a basis weight of 13 og/m''.

Fabric weight: 409 made of 75d/36f polyester yarn
/rrl' plain weave as an intermediate layer and web on the surface (8)
A three-layer laminate was obtained by placing the sheet (B) on the back side.

The three-layer laminate was placed on a net moving at a speed of 0.5 m/7 min, and nozzles with a diameter of 0.2% were arranged at intervals of 2 in the width direction at 56 IIL on the net, and pressurized water of 20 kg/i was directed downward. At the same time, the net was forcibly drained using a dewatering box installed at the bottom of the net to promote entanglement.

At this time, move the nozzle in the width direction with a stroke of 2cIfL, 20
Reciprocating motion was performed 0 times/min.

This treatment was carried out by alternating the front and back sides of the laminate twice.

The obtained entangled body was impregnated with a polyvinyl alcohol aqueous solution and dried.

8% by weight of polyvinyl alcohol was deposited.

Next, I sanded the front and back sides with 240 mesh sandpaper.

Next, 20% of carboxymethyl cellulose was applied to the layer side surface.
The aqueous solution was coated and dried.

CMC adhered to the surface in the form of a film, and the amount of adhesion was 23% by weight.

Next, polyether-based polyurethane elastomer 15
%DMF (N,N-dimethylformamide) solution and wet coagulated in a 20% DMF aqueous solution.

Subsequently, it was thoroughly washed with hot water to dissolve and remove the polyvinyl alcohol short fibers, polyvinyl alcohol glue, and CMC coating agent.

Next, dye with disperse dye at 130°C for 90 minutes.
Further, reduction cleaning was performed in the usual manner.

After drying, (5) the side surface was brushed, resulting in a product with extremely elegant suede-like fuzz.

The properties of the obtained product were as follows.

Example 2 Polyethylene terephthalate was spun using a conventional spinning device and drawn using a spur draw method to produce a 0.2 denier ultrafine yarn, which was cut into 5 mm lengths.

These short fibers and PVA fibers that dissolve in water at temperatures of 60°C or higher (
1 denier, length 671! ? +! ) A total of 100 parts was dispersed in 50,000 parts of room temperature water at different mixing ratios to prepare a slurry for papermaking.

A dispersion aid was added to the slurry.

The following three types of sheets were obtained by forming sheets from this slurry.

These paper sheets were laminated on both sides of a 50 denier/24 filament PET fiber tricot having a basis weight of 50 g/m, and were entangled and integrated by jetting a high-pressure, high-speed water stream in the same manner as in the example.

The combination of paper sheets and the physical properties of the resulting integral entangled body were as follows.

The obtained laminated entangled body samples/I61-6 were processed in the same manner as in Example 1 to obtain suede-like products.

The amount of polyurethane in each sample was between 59 and 63% by weight.

The product evaluation results were as follows.

Example 3 Nylon 6 was spun using the melt-blowing method to produce a fabric with a fabric weight of 8, consisting of ultra-fine yarn with a single yarn fineness of 0.02 to 0.05 denier.
A web (5) of 0 g/lri was obtained.

On the other hand, a nylon 6 press-crimped yarn with a diving shrinkage rate of 12% and a single yarn fineness of 1.0 denier was cut into a length of 50 mm.
A dry nonwoven fabric was obtained by carding and needle punching in a conventional manner.

After shrinking under water, it was glued, then cut into a 1 mm thick sheet using a slicing machine, and then ground using an emery paper puff machine.

Next, the glue was extracted and removed to give a thickness of 0.5 mm and a basis weight of 4.
A sheet of 5 g/rrl was obtained.

In addition, the same nylon 6 thread was cut into a length of 5 mm, made into a water slurry, and a sheet (Q) having a thickness of 0.4 mm and a basis weight of 80 g/71 t was obtained using a papermaking method.

A tricot fabric with a basis weight of 409/m made from nylon 6 of 70 denier and 24 filaments is used as an intermediate layer, and a web (5) is laminated on the surface and a sheet (g) is laminated on the back side.
Next, the entanglement treatment was performed in the same manner as in Example 1.

It was further processed in the same manner as in Example 1 to obtain a suede-like leather-like sheet.

This product was highly flexible, had a dense layer of fine fluff on its surface, and had excellent lighting effects.

The degree of flexibility determined by the 45° cantilever method was 42 mrrt.

In addition, when the apparent density of the fibers of the entangled body layer (5) was measured, it was o, 37 g/cr; t, and the apparent density of the entangled body layer (B) was 0.
．． It was 11.9/i.

The amount of polyurethane filled was 55% by weight based on the fibers.

The thickness of the product was 0.90 mm.

On the other hand, as a comparative example, a product was obtained by performing the same treatment on a product using the above-mentioned nylon tricot as the intermediate layer and the above-mentioned paper-made sheet (Q) on the back side with the web layer on the front side.

Although the surface of this product had an excellent suede appearance, its texture was hard and cardboard-like, far from the texture of suede leather.

The degree of flexibility determined by the 45° cantilever method was 85 degrees.

The polyurethane filling amount was 52% by weight based on the fibers.

The apparent density of the entangled body layer (5) is o, 3sg/i. The apparent density of the entangled body layer (B) was 0.28 g/ffl.

The product thickness was 0.95 mrtt.

Example 4 Short acrylic fibers with a single yarn denier of 0.15 and a cut length of 3 mm were made from a water slurry to obtain a sheet.

30 parts by weight of the same acrylic short fibers and cold water swollen, hot water soluble PVA short fibers (single yarn 4 denier, cut length 6 mm) 7
A mixed sheet (B) was obtained by mixing with 0 parts by weight and making paper from the water slurry.

Weight 40g made from 75d/36f polyester
/m of tricot was laminated with Shea) (A) on one side and Shea) (Bl) on the other side, and the entangling treatment was performed in the same manner as in Example 1 so that the sheets became a fluff layer on the surface of the product. Ta.

It was then impregnated with an aqueous polyurethane dispersion and dried.

The PVA fibers were then removed by extraction in hot water and further dyed with a cationic dye in a conventional manner.

When the surface of the product (sheet A side) was puffed with emery paper, elegant fluffs were generated and a suede-like surface was obtained.

The product exhibited a highly flexible leather-like texture, which was favorable.

The flexibility determined by the 45° cantilever method was 50 mvt.

The thickness of the product was 0.75 mm, and the apparent density of the fibers of the entangled body layer (5) was 0.25 g/ci, which was calculated from the basis weight of the materials used and the measured thickness of the cross section.

The apparent density of the entangled body layer (B) was o, o69/crA.

Example 5 Single yarn denier obtained by melt blowing method is 0.03~
A polyethylene terephthalate microfiber web (5) with a distribution of 0.07 was prepared.

Composite yarn with a multicore sheath-core cross section obtained by composite spinning method (
Sheath component: polystyrene, core component: polyethylene terephthalate, number of core components: 8, sheath:core component weight ratio 1:1) was stretched to 2.8 times in warm water, and then heat set at 130°C to obtain a single yarn denier. A composite filament of 4.0 was obtained.

This was cut into a length of 4 mm, and a paper sheet (5) having a basis weight of 12 og/rrl was obtained by a paper making method as a water slurry.

50d/24f polyester filament fabric weight 5
Web (5
) were stacked, and the paper sheet (B) was further stacked on the back side to form a three-layer sheet.

This material was entangled by jetting water in the same manner as in Example 1.

Next, both sides were buffed and raised with emery paper.

Next, it was impregnated with a PVA aqueous solution and dried.

The amount of PVA deposited was 18%.

Further, the surface of the sheet (5) side was coated with a 20% aqueous solution of CMC and dried.

The amount of coating was 25g.

Next, the polystyrene component of the composite yarn was extracted by immersing it in tetrachloroethane.

Then, it was impregnated with a PVA aqueous solution and dried.

The amount of PVA attached at this time was 10%. Next, it was impregnated with a 15% DMF solution of a polyether polyurethane elastomer, and the solvent was removed in water to solidify it.

Furthermore, all previously used sizing agents were washed away in hot water.

It was dyed with a disperse dye in a conventional manner at 130°C.

The dye contaminating the polyurethane was removed by thorough reduction washing, and the polyurethane was dried.

Finally, when the surface was smoothed with a brush, it showed an elegant suede-like appearance covered with ultra-fine raised fibers.

The texture of the product was flexible, light, and leather-like with a soft and substantial feel.

The degree of flexibility determined by the 45° cantilever method was 4.5 mm.

The amount of polyurethane filled was 63% by weight based on the fibers.

The thickness of the product was 0.87 mm, the apparent density of the entangled body layer on the front side was 0.35.9/i, and the apparent density of the entangled body layer on the back side was 0.0 Fl/~.

Comparative Example A three-layer sheet was prepared by using the melt-blown web (5) of Example 1 on both sides of a polyester plain weave fabric (75d/36f, fabric weight: 40g/m), and this was prepared in the same manner as in Example 1. A product was obtained by performing entanglement treatment and processing and finishing.

At this time, when the impregnation rate of the polyurethane solution was measured, it was found that 15 minutes of immersion time was required to set the polyurethane filling amount to 55% by weight of the fiber.

Further, when the obtained product was subjected to a Scotto kneading test, it was peeled into three layers after 20 kneading cycles.

On the other hand, in the case of Test/I61 in Example 1, the polyurethane impregnation time reached the predetermined polyurethane filling amount in 1 minute.

In addition, no peeling was observed in the Scott Massage Test of the product even after massaging it 200 times.

Claims (1)

[Claims] An entangled layer (5) of ultrafine fibers of 10.5 denier or less and another entangled fiber layer (Bl) are intertwined with each other via a knitted fabric (C) existing between the two layers. It consists of a laminated tangled body that is integrated into one body, and an elastic polymer filled in the voids of the laminate tangled body, and consists of ultrafine fibers that constitute the tangled body layer (5) on the surface of the tangled body layer (A). A leather-like sheet material having fluff and having an apparent density of the entangled body layer (B) of 15 g/i or more and an apparent density of less than 15 glcr!2. Claim 1, characterized in that the ultrafine fibers constituting the entangled body MA) are spun by a melt-blowing method.
The leather-like sheet material described in . 3. The leather-like sheet product according to claim 1, wherein the entangled body layer is an entangled body of a paper sheet. 4 Fiber entangled body layer (Claim 1, 2 or 3, characterized in that Bl is an entangled body of a paper sheet)
The leather-like sheet material described in . 5. The leather-like sheet material according to claim 1, 2, 3, or 4, wherein the elastic polymer is a polyurethane elastomer. 6 Knitted fabrics (with q as the intermediate layer, on the surface of which a fiber sheet consisting mainly of ultrafine yarn with a single fiber denier of 0.5 or less is laminated, and on the back side, two or more types of fibers with different solubility are mixed) A three-layer laminate is formed by arranging a fiber sheet made of a composite or mixed spun fiber of two or more types of polymers with different solubility, and a three-layer laminate is formed by subjecting this laminate to fiber entanglement treatment. are integrated, the ultrafine fibers are fluffed from the surface ultrafine fiber sheet to form an ultrafine fiber entangled layer (5), the interlaced fiber gaps are filled with an elastic polymer, and at least one type of fiber sheet forming the back surface is formed. The method comprises dissolving and removing component fibers or component polymers to form an entangled body layer (B) made of residual components, and the apparent density of the ultrafine fiber entangled layer (5) is set to 0,11/Cr1t or more. ,
A method for producing a leather-like sheet product, characterized in that the apparent density of the entangled layer (B) is less than 0.15 g/d.