JP3162846B2 - Nubuck sheet material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material widely used for shoes, bags, bags, clothing, furniture, vehicles, and the like, and in particular, has a smooth texture and moderate slime like natural leather. The present invention relates to a nubuck-like sheet material having a matte tone and a velvet-like softness, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a nubuck-like sheet material, a synthetic sponge layer is formed by wet coagulation of a solution layer of a synthetic polymer or dry foaming of a synthetic polymer to form a porous sponge layer, followed by grinding and removing the skin layer on the surface. After exposing a part of the fine pores and applying an elastic polymer to a fiber aggregate such as woven fabric, knitted fabric, or non-woven fabric, buffing the surface with sandpaper etc. to shorten the hair length What was done is Tokiko 60
No. 43475 and JP-B-61-32432. However, these are all suede-like appearances and touches of natural leather, which are completely different from nubuck appearances and touches. On the other hand, those in which natural leather powder or collagen is mixed into a polyurethane resin layer formed on a base material to obtain an appearance and texture similar to natural leather are disclosed in JP-B-63-23644 and JP-B-6-1988.
It is known from JP 3-31567. These leather-like sheets merely contain natural leather powder or collagen powder, do not have fiber nap on the surface, and do not have the appearance and touch of nubuck.

In order to improve the drawbacks of the conventional synthetic leather, a nap sheet having a fiber nap on the surface of a fibrous sheet containing a polymer mainly composed of an elastic polymer in a fiber assembly has been proposed. The surface portion is mainly non-fibrous, has an average particle size of 10 μm or less, and has an apparent bulk density of 0.
Nubuck napping hair having a surface in which a region consisting of a mixture of collagen powder of 1 to 0.3 g / cm ² and a polymer mainly composed of polyurethane and having no or little fiber nap and a region mainly consisting of fiber nap are mixed. If the sheet is
No. 136280.

[0004]

However, although this nubuck raised sheet can improve the drawbacks of the conventional synthetic leather and can obtain a nubuck raised sheet,
There is almost no slime peculiar to nubuck of natural leather, it is far from nubuck of natural leather, and after dry cleaning, slime peculiar to nubuck is completely lost, and the dry cleaning resistance is poor. Was.

The present invention improves the drawbacks of these conventional synthetic leathers and nubuck raised sheets, has a smooth texture and slimy like natural leather nubuck, and loses its slimy feeling even after dry cleaning. It is intended to provide a nubuck-like sheet material having a matte tone and a velvet-like softness.

[0006]

That is, the present invention relates to a sheet material comprising a fibrous base in which a polymer mainly composed of an elastic polymer is contained in a fiber assembly, and a fiber nap formed on a surface of the fibrous base material. The surface portion of the sheet material is made of a mixture obtained by adding 5 to 100 parts by weight of a spherical fine powder having an average particle diameter of 10 μm or less to 100 parts by weight of a polymer mainly composed of polyurethane, and a region having no or little fiber napped, The present invention relates to a nubuck sheet material characterized in that a region mainly composed of fibrous naps is mixed, and a fibrous base material in which a polymer mainly composed of an elastic polymer is contained in a fiber aggregate, After applying a polymer solution mainly composed of polyurethane containing a spherical fine powder having a diameter of 10 μm or less, heating and drying, the surface is embossed to form irregularities, and then the irregular surface is subjected to a brushing treatment. The present invention relates to a method for producing a characteristic nubuck sheet material.

The fiber aggregate used in the present invention includes a woven fabric, a knitted fabric, or a fiber entangled fabric made of any fiber such as ordinary fiber, ultrafine fiber and / or bundled fiber thereof, and special porous fiber. It is a sheet-like material mainly composed of fibers such as non-woven fabric, and non-woven fabric is particularly preferable. The nonwoven fabric is used by three-dimensionally bonding fiber webs by needle punch, high-speed fluid flow, or the like. These woven fabrics, knitted fabrics, synthetic fibers such as polyester, polyamide, polyacrylonitrile, polyolefin, polyvinyl alcohol, etc., synthetic fibers such as regenerated cellulose,
Natural fibers or fibers of a special form, for example, ultrafine fibers such as polyester, polyamide and polyacrylonitrile, or multicomponents that can be modified into ultrafine fiber bundle fibers or special porous fibers by dissolving and removing at least one component. Fibers selected from fibers are used. In particular, in the present invention, the fibers forming the nap are 0.5 dr.
The following ultrafine fibers are preferred.

The fiber assembly includes at least one elastic polymer selected from the group consisting of elastic polymers such as polyurethane, acrylic polymer, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer and synthetic rubber. A fibrous base material is obtained by incorporating a polymer mainly composed of coalesced materials. The method of incorporating the polymer mainly composed of the elastic polymer into the fiber assembly can be performed by applying an aqueous dispersion (emulsion) or a solution of the polymer mainly composed of the elastic polymer to the fiber assembly and impregnating the fiber assembly. There may be. The method of coagulating and depositing the polymer can also be employed by any method such as a dry method or a wet method, but in a mixed solution of a solvent and a non-solvent of the elastic polymer from the viewpoint of the balance between the flexibility and the sense of fulfillment of the obtained fiber napped sheet. It is preferable to use a wet coagulation method for coagulating the mixture into a porous structure.

The spherical fine powder used in the present invention includes inorganic spherical fine powders such as silica fine powder, glass fine powder, glass fine hollow spheres, crosslinked vinyl chloride resin, crosslinked acrylic resin, crosslinked polyolefin resin. Spherical fine powder of a crosslinked synthetic resin such as a phenolic resin, a melamine resin, a urea resin, and a benzoguanamine resin can be used. From the viewpoints of adhesion to the elastic polymer and retention of spherical fine powder (prevention of falling off), spherical fine powder of a crosslinked synthetic resin is particularly preferred. Also, among the crosslinked synthetic resins, phenolic resins, melamine resins,
Urea resins and benzoguanamine resins are particularly preferred.
Examples of the phenol-based resin, melamine-based resin, urea-based resin, benzoguanamine-based resin, and the like include phenol-formaldehyde condensate, melamine-formaldehyde condensate, urea-formaldehyde condensate, and benzoguanamine-melamine-formaldehyde condensate. Specific products include Nippon Shokubai Co., Ltd. Eposter MS, Eposter M30, Eposter S12, Nippon Kasei Co., Ltd. organic filler, organic filler P-4.
And the like. The above spherical fine powders can be used alone or in combination of two or more.

The average particle size of the spherical fine powder must be 10 μm or less, and when the average particle size is larger than 10 μm, the surface becomes rough and the sliminess peculiar to nubuck of natural leather cannot be obtained. It is. Further, the apparent bulk density of the spherical fine powder is preferably 0.1 to 0.6 g / cm ³ , and 0.1 g / c
When it is smaller than m ³ , the strength of the spherical fine powder tends to decrease, and the strength of the coating film tends to decrease, and the slimy feeling similar to nubuck of natural leather tends to be lost. On the other hand, when the apparent bulk density is more than 0.6 g / cm ³ , the bulkiness of the spherical fine powder decreases, and it becomes difficult to obtain a slimy feeling similar to nubuck of natural leather.

The mixing ratio of the spherical fine powder and the polymer mainly composed of polyurethane is 5 to 100 parts by weight based on 100 parts by weight of the polymer mainly composed of polyurethane.
5 parts per 100 parts by weight of a polymer mainly composed of polyurethane
When the amount is less than 10 parts by weight, the same slimy feeling as nubuck of natural leather cannot be obtained. On the contrary, when the amount exceeds 100 parts by weight, the amount of the spherical fine powder is too large, and the spherical fine powder is a polymer mainly composed of polyurethane. It is not firmly fixed and loses the slimy feeling similar to natural leather nubuck due to dry cleaning.

The polyurethane constituting the polymer mainly composed of polyurethane is selected from the group consisting of polymer diols having an average molecular weight of 500 to 2500, for example, polyester diol, polyether diol, polyester ether diol, polycaprolactone diol, polycarbonate diol and the like. And at least one or more polymer diols, and organic polyisocyanates, for example, aliphatic diisocyanates, aliphatic diisocyanates having a cyclic group,
Aromatic diisocyanate, alicyclic diisocyanate, aromatic triisocyanate, triphenylmethane 4,4 ', 4 "-
Polyurethane obtained by reacting at least one kind of organic polyisocyanate selected from the group of triisocyanate and the like with a low molecular compound having at least two active hydrogen atoms as a chain extender can be used. This polyurethane is preferably soft with a 100% modulus of 20 to 60 kg / cm ² so as not to impair the feel of the fibrous base material.

A mixture of a spherical fine powder and a polymer mainly composed of polyurethane is applied to the surface of a fibrous base material as a dispersion liquid in which the spherical fine powder is dispersed in a polymer solution. Colorants such as dyes and pigments, stabilizers, antistatic agents, leveling agents, and the like are added to the coating solution depending on the purpose. As a method of applying, any method can be used as long as it is a commonly used application method such as a roll application method, a spray application method, a knife application method, or the like, which uses a roll such as a notched roll or a smooth surface roll. it can.

The amount of the mixture of the spherical fine powder and the polymer mainly composed of polyurethane on the surface of the sheet material formed with fiber nap is 1 to 20 g / weight of the spherical fine powder.
m ² , preferably in the range of ^{2 to} 15 g / m ² . If the amount of the spherical fine powder applied is less than 1 g / m ² , the entire surface does not have a fine matte surface and not only does not provide a smooth touch, but also a slimy feeling similar to nubuck of natural leather. It cannot be obtained. On the other hand, when the application amount of the spherical fine powder increases, the appearance and touch of the obtained sheet material do not deteriorate, but not only the film strength is reduced and the durability is deteriorated, but also the same as the nubuck of natural leather when dry-cleaned. The slimy feeling is completely lost.

The surface of the fibrous base material on which the mixture of the spherical fine powder and the polymer mainly composed of polyurethane is applied, regardless of whether the surface is a raised surface or a non-raised surface, the nubuck sheet material of the present invention can be used. can get. However,
In order to obtain a better nubuck feeling, it is necessary to form the fiber nap by raising the fibrous base material in advance before applying the mixture of the spherical fine powder and the polymer mainly composed of polyurethane. preferable.

The brushing treatment before applying the mixture of the spherical fine powder and the polymer mainly composed of polyurethane can be carried out by a conventionally known method.
Sand cloth, sand net, sand roll, brush,
In addition to buffing with a needle cloth, a grindstone, or the like, a flocking process of electrostatically flocking short fibers is also included. Buffing is preferred in that uniform nap is easily obtained, and buffing using sandpaper is particularly preferred.

The surface coated with the mixture of the spherical fine powder and the polymer mainly composed of polyurethane has a seemingly smooth surface, but when observed under magnification with an electron microscope or the like, the surface is not a smooth surface, but is almost entirely spherical. Hemispherical irregularities derived from the body are observed. The fine hemispherical irregularities are important for the touch, slime, appearance of solidness, color depth, and matte appearance of the nubuck-like sheet material of the present invention. The proportion of the polymer that has been high and the valleys of the hemispherical irregularities are almost completely filled with the polymer, the touch, slimy, profound feeling, color depth, matte appearance like nubuck of natural leather I can't get it.

A mixture of a spherical fine powder and a polymer mainly composed of polyurethane is applied to a fibrous base material, impregnated with the mixture, heated and dried or wet-coagulated, and then the sheet surface is subjected to a raising treatment. However, it is important that the brushing process is not to raise the entire surface uniformly, but to have a surface in which the fiber raised portion and the spherical fine powder application portion with almost no raised are mixed, such as embossing and rubbing It is preferable to perform a raising treatment on the surface after the uneven pattern is imparted. The fiber napped part and the non-napped part are not clearly separated in a pattern shape, and the state in which they are mixed and mixed together is preferable for obtaining a touch and slimy feeling closer to the nubuck of natural leather. .

The method of raising the brush after applying the mixture of the spherical fine powder and the polymer mainly composed of polyurethane includes sandpaper, sandcloth, and the like in the same manner as the raising of the fibrous base material before coating.
It can be processed by buffing with a sand net, sand roll, brush, needle cloth, whetstone, etc., but it is necessary to avoid raising the brush under strong conditions such as grinding and removing all the spherical fine powder applied to the surface, When a polymer mixture containing a spherical fine powder is applied to the surface of a previously brushed surface, it is preferable to lightly raise or trim the hair using a sandpaper, a brush, or the like having a gentle action.

After the raising treatment, a kneading process can be further performed. By this kneading process, the texture of the nubuck tone sheet material of the present invention becomes softer, and the region consisting of the fiber nap and the region having no or little fiber nap are mixed and integrated, so that the nubuck of the natural leather is further mixed. Appearance and texture close to are preferable. Further, in the case of the surface having the irregularities formed by embossing, the feeling of the irregularities becomes mild by the kneading process, and the appearance is closer to the appearance and texture of natural leather. As a means of the kneading process, either hand kneading or mechanical kneading may be used, and as the machine kneading, a kneading machine that mechanized the hand kneading operation may be used, or a kneading machine using rotation like a dryer may be used. May be. From the viewpoint of wrinkling and workability, kneading using a tumbler dryer utilizing rotation is preferred. The kneading conditions when using a rotary kneading machine are 70 to 1
Kneading at a rotation speed of about 20 to 30 rpm / min for about 30 to 60 minutes in an atmosphere of 00 ° C. is preferable.

In the production of the nubuck-like sheet material of the present invention, ordinary dyeing treatment and treatment with various treatment agents such as an antistatic agent and a softening agent can be performed at any stage of the production process.

[0022]

The nubuck sheet material of the present invention has an average particle size of 10 μm per 100 parts by weight of a polymer mainly composed of polyurethane.
m or less, and a region in which 5 to 100 parts by weight of a spherical fine powder is added and which has no or few fiber naps and a region mainly composed of fiber naps are mixed together, such as nubuck of natural leather. A nubuck-like sheet material having a smooth texture and sliminess, without losing its sliminess even after dry cleaning, and having a matte tone and a velvet-like softness.

[0023]

【Example】

Example 1 As an entangled nonwoven fabric made of polyamide as a fibrous sheet,
Polyester polyurethane containing a brown colorant 17
% DMF (dimethylformamide) solution and coagulated and desolvated in a 15% DMF aqueous solution at a temperature of 25 ° C. to obtain a sheet in which the entangled nonwoven fabric contains polyurethane in a microporous state. The sheet was used as a sheet-like material which was dyed brown by the Wins dyeing method using a brown acid dye.
The surface of this fibrous sheet was raised with a 180 mesh sandpaper to form a raised fiber surface.
On the raised surface of this fibrous sheet, 100 parts by weight of a 30% solution of polycaprolactone-based polyurethane in DMF, 20 parts by weight of a brown coloring material, an average particle diameter of 5 μm and an apparent bulk density of 0.1
A mixture mainly composed of polyurethane consisting of 3 parts by weight of spherical fine powder of urea-formaldehyde condensate of ³ g / cm ³ and 20 parts by weight of DMF was applied by knife coating to a wet basis weight of 60 g / m ² , and heated at 100 ° C. After drying for 3 minutes, a surface coating layer was formed. Then, the surface coating layer surface was heated and press-embossed with a leather embossing roll to obtain a leather-like sheet. The surface of this leather-like sheet is 24
Lightly buffed with 0 mesh sandpaper,
The sheet was further rubbed at 90 ° C. for 40 minutes with a tumbler rubbing machine to obtain a nubuck-like sheet material. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 2 Amount of spherical fine powder of urea-formaldehyde condensate added 6
A nubuck-like sheet material was obtained in the same manner as in Example 1 except that the amount was changed to parts by weight. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 3 In the same manner as in Example 1 except that 6 parts by weight of a benzoguanamine-formaldehyde condensate spherical fine powder was added instead of adding 3 parts by weight of a urea-formaldehyde condensate spherical fine powder. A nubuck-like sheet material was obtained. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 4 In the same manner as in Example 1 except that 6 parts by weight of a melamine / formaldehyde condensate spherical fine powder was added instead of adding 3 parts by weight of a urea / formaldehyde condensate spherical fine powder. A nubuck-like sheet material was obtained. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 5 Same as Example 1 except that 6 parts by weight of spherical fine powder of benzoguanamine / melamine / formaldehyde condensate was added instead of adding 3 parts by weight of spherical fine powder of urea / formaldehyde condensate. To obtain a nubuck-like sheet material. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 6 A nubuck sheet material was prepared in the same manner as in Example 1 except that 6 parts by weight of silica fine powder was added instead of 3 parts by weight of urea-formaldehyde condensate spherical fine powder. I got The resulting nubuck-like sheet material has a smooth texture and slimy like natural leather nubuck, though slightly inferior to slimy feel and feel compared to the case of using the spherical fine powder of the crosslinked synthetic resin, and is dry-cleaned. After that, it did not lose its slimy feeling, had a smooth tone similar to that of natural leather, had a slight nap, and had a moderate matting effect and a natural feel.

Example 7 A nubuck-like sheet material was obtained in the same manner as in Example 1 except that the amount of the spherical fine powder of the urea-formaldehyde condensate was changed to 30 parts by weight. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 8 A spherical fine powder of a urea-formaldehyde condensate having an average particle diameter of 10 μm and an apparent bulk density of 0.21 g / cm ³ was used. Example 1 except that the coating amount of the mixture was 100 g / m ²
A nubuck sheet material was obtained in the same manner as described above. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Example 9 A 15% DMF solution of a polycarbonate-based polyurethane containing a gray colorant was impregnated into a entangled nonwoven fabric made of polyester as a fibrous sheet, and 13% at a temperature of 20 ° C.
After coagulation and desolvation in a DMF aqueous solution, a sheet was obtained in which the entangled nonwoven fabric contained polyurethane in a microporous state. The sheet was used as a sheet which was dyed gray by a high-temperature and high-pressure dyeing method using a gray disperse dye. The surface of the fibrous sheet was subjected to a brush raising treatment with a 240 mesh sandpaper to form a fiber raised surface. On the raised surface of this fibrous sheet, 100 parts by weight of a 20% DMF solution of polycarbonate-based polyurethane and a gray-based colorant 1
A mixture mainly composed of 5 parts by weight of a spherical fine powder of a benzoguanamine / formaldehyde condensate having an average particle size of 2 μm and an apparent bulk density of 0.3 g / cm ³ and 10 parts by weight of DMF and a polyurethane-based mixture is wet-coated by knife coating. Coating was performed so as to be 70 g / m ^2, and drying was performed at 100 ° C. for 3 minutes to form a surface coating layer. Then, the surface coating layer surface was heated and press-embossed with a leather embossing roll to obtain a leather-like sheet. The surface of this leather-like sheet is 2
Lightly buffed with 40 mesh sandpaper, and then tumbled with a tumbler at an ambient temperature of 100 ° C.
It was rubbed for 0 minutes to obtain a nubuck-like sheet material. The resulting nubuck-like sheet material has a smooth texture and slimy like nubuck of natural leather, does not lose its slimy feeling even after dry cleaning, and is smooth and similar to natural leather and slight It had a nap and had a moderate matting effect and a natural feel, and was very similar to the appearance and touch of a nubuck made of natural leather.

Comparative Example 1 A nubuck-like sheet material was obtained in the same manner as in Example 1 except that spherical fine powder of a urea-formaldehyde condensate was not used. The resulting nubuck-like sheet material does not have a smooth texture like nubuck of natural leather or a slimy feeling peculiar to nubuck of natural leather, and has a smooth tone peculiar to natural leather and has a slight nap, and is moderate There was no matting effect, and the appearance and touch of nubuck made of natural leather were far from good.

Comparative Example 2 A nubuck sheet material was obtained in the same manner as in Example 1, except that the amount of the spherical fine powder of urea / formaldehyde condensate was changed to 1 part by weight. The resulting nubuck-like sheet material does not have a smooth texture like nubuck of natural leather or a slimy feeling peculiar to nubuck of natural leather, and has a smooth tone peculiar to natural leather and has a slight nap, and is moderate There was no matting effect, and the appearance and touch of nubuck made of natural leather were far from good.

Comparative Example 3 A nubuck sheet material was obtained in the same manner as in Example 1 except that spherical fine powder of a urea-formaldehyde condensate had an average particle diameter of 30 μm and an apparent bulk density of 0.26 g / cm ^3. Was. The resulting nubuck-like sheet material does not have a smooth texture like nubuck of natural leather or a slimy feeling peculiar to nubuck of natural leather, and has a smooth tone peculiar to natural leather and has a slight nap, and is moderate No matte effect,
The appearance and touch of the nubuck made of natural leather were far from normal.

COMPARATIVE EXAMPLE 4 Instead of adding 3 parts by weight of spherical fine powder of urea-formaldehyde condensate, an average bulk particle size of 7 μm and an apparent bulk density of 0.
A nubuck sheet material was obtained in the same manner as in Example 1 except that 40 parts by weight of 2 g / cm ³ of collagen powder was added. Although the obtained nubuck-like sheet material is slightly inferior to the case of using the crosslinked synthetic resin spherical fine powder in sliminess and feel, it has a smooth texture and slime like nubuck of natural leather, and It had a smooth tone similar to that of leather and had a slight nap and had a moderate matting effect and a natural feel.However, the slimy feeling, feel and matte feeling of this nubuck sheet material were dry. It was completely lost after cleaning.

Comparative Example 5 A nubuck-like sheet material was obtained in the same manner as in Example 1 except that the amount of the spherical fine powder of the urea-formaldehyde condensate was changed to 40 parts by weight. Although the obtained nubuck-like sheet material is slightly inferior to the case of using the crosslinked synthetic resin spherical fine powder in sliminess and feel, it has a smooth texture and slime like nubuck of natural leather, and It had a smooth tone similar to that of leather and had a slight nap and had a moderate matting effect and a natural feel.However, the slimy feeling, feel and matte feeling of this nubuck sheet material were dry. It was lost after cleaning.

[0037]

[Table 1]

As is evident from Table 1, excellent touch feeling, slimy feeling, matte feeling and surface strength are obtained, and these properties are not lost even after dry cleaning. Only the embodiment of the present invention retains the appearance and feel. Comparative Example 1, in which no fine powder was added at all, was completely different from nubuck of natural leather in touch feeling, slimy feeling and matte feeling. Comparative Example 2 in which the addition amount was less than 5 parts by weight with respect to 100 parts by weight of polyurethane had a nubuck of natural leather which was better than that of Comparative Example 1 in which fine powder was not added at all, but had a good touch, slimy feeling and matte feeling. Was far away. Comparative Example 3 using fine powder having an average particle size of more than 10 μm
Has a better touch, slimy feeling and matte feeling than in the case of Comparative Example 1, but has a slightly harder touch and a feeling of artificialness, has no slimy feeling and has a rough surface, and is far from natural leather nubuck. Was. Those using collagen powders that are not spherical fine powders have excellent touch feeling, slimy feeling and matte feeling similar to nubuck of natural leather, but the surface strength is slightly inferior, and after dry cleaning, Tactile sensation, slimy feeling and matte feeling were completely lost. Further, when the amount of the spherical fine powder added is polyurethane 10
Comparative Example 5, which contained more than 100 parts by weight with respect to 0 parts by weight, had the same tactile sensation, slimy feeling, matte sensation, and surface strength as those of the example, but after dry cleaning, the above-mentioned tactile sensation and slimy feeling were obtained. The matte feeling was completely lost.

[0038]

According to the present invention, there is provided a nubuck sheet material comprising a fibrous assembly containing a polymer mainly composed of an elastic polymer and a fibrous base formed on the surface of a fibrous base material, The surface portion of the sheet material is made of a mixture obtained by adding 5 to 100 parts by weight of a spherical fine powder having an average particle diameter of 10 μm or less to 100 parts by weight of a polymer mainly composed of polyurethane, and a region having no or little fiber napped, Because it is a mixture of areas mainly composed of fiber naps, it has a smooth texture and slimy like natural leather nubuck, without losing its slimy feeling even after dry cleaning, and in a matte tone A nubuck-like sheet material having a velvet-like soft feeling can be obtained.

Claims (5)

(57) [Claims] Claims: 1. A sheet material comprising a fibrous base material containing a polymer mainly composed of an elastic polymer in a fiber assembly, and a fiber nap formed on the surface of the fibrous base material. A mixture of 5 to 100 parts by weight of a spherical fine powder having an average particle size of 10 μm or less with respect to 100 parts by weight of a polymer mainly composed of Nubuck-like sheet material characterized by having. 2. The nubuck-like sheet material according to claim 1, wherein the spherical fine powder is a spherical fine powder of a crosslinked synthetic resin. 3. The nubuck sheet material according to claim 2, wherein the cross-linked synthetic resin is at least one of a urea resin, a melamine resin, a phenol resin, and a benzoguanamine resin. 4. A fibrous base material in which a polymer mainly composed of an elastic polymer is contained in a fiber assembly, and a polyurethane-based heavyweight containing a spherical fine powder of a crosslinked synthetic resin having an average particle diameter of 10 μm or less. A method for producing a nubuck-like sheet material, comprising applying a combined solution, heating and drying, embossing the surface to form irregularities, and then subjecting the irregular surface to a raising treatment. 5. The method for producing a nubuck-like sheet material according to claim 4, wherein the fibrous base material has a fiber nap formed on a surface thereof.