JP2595414B2 - Antistatic natural leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to antistatic natural leather.

[0002]

2. Description of the Related Art Conventionally, the antistatic property of a woven or knitted fabric has been achieved by polymerizing a conductive layer such as a carbon-containing backing layer on the back surface. There is known a method in which a conductive layer such as a substance-containing foam layer is polymerized, and further a protective layer such as polyurethane is polymerized on the surface thereof.

[0003]

Now, seats of automobiles and the like,
When the antistatic of natural leather used for shoes or various clothes is performed by polymerizing a conductive layer such as a carbon-containing backing layer on the back surface, as in the case of the above-described woven or knitted fabric, the conductive layer Is partly peeled off during the finishing process of the leather making process, or its conductive layer is brittle just because the conductive material such as carbon is mixed, and therefore,
During use as the product, there is also a disadvantage that the product is partially peeled off or cracked.

In addition, since the conductive layer is located on the back surface of the natural leather, the distance from the surface of the leather, which generates static electricity due to friction, to the conductive layer is increased, so that the discharge effect of the product is reduced. There are drawbacks.

Similarly, when the antistatic of natural leather is performed by directly polymerizing a conductive layer such as a foamed layer containing a conductive substance on the surface of natural leather, as in the case of the synthetic leather,
The amount of conductive material necessary to obtain the desired conductivity is mixed, so that the adhesion of the layer to the natural leather surface is deteriorated, and the strength of the finish coating layer on the surface including the conductive layer is remarkably increased. And has the disadvantage of significantly reducing the quality of the product.

The present inventors have made intensive studies on the development of antistatic natural leather having no such disadvantages, and have accomplished the present invention.

[0007]

According to the present invention, the antistatic natural leather has an adhesive layer 1, 6, 10 containing an acrylic binder on the surface of the natural leather a. The conductive layers 2, 7, 11 containing carbon having a ratio of about 10 MΩ or less, and the protective layer 3 containing pigment.
8, 12 are sequentially laminated.

The protective layers 3, 8 and 12 containing the pigment are further covered with protective layers 4 and 5 containing a solvent-based urethane paint, a protective layer 9 containing a nitrified cotton lacquer, or a protective layer 13 containing a urethane-based binder. It is effective.

[0009]

According to the present invention, static electricity generated by friction on the surface of natural leather, more specifically on the surface of the outer protective layer,
Since it flows into the conductive layer containing carbon and the potential difference on its surface is eliminated, no shock or discomfort is given to the human body.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The antistatic natural leather of the present invention will be described in detail below with reference to the illustrated embodiment. FIG. 1 is a partially enlarged cross-sectional view of a first embodiment used for a seat of an automobile or the like, where a is, for example, natural leather which has been silvered, and b is a finish coating layer provided on a silver surface (surface) of the natural leather a. is there.

The finish coating layer b is formed by sequentially laminating an adhesive layer 1, a conductive layer containing carbon, and protective layers 3 to 5 on the surface of natural leather a. An example of the composition of each layer is as shown in Table 1,
Each layer is formed by spray coating.

[0012]

[Table 1]

When the carbon concentration is less than 15%, the conductivity of the carbon-containing conductive layer 2 is sharply reduced.
It is desirable to ensure conductivity of about 0 MΩ or less. Although the carbon-containing conductive layer 2 contains carbon, the carbon-containing conductive layer 2 is formed on the surface of the natural leather a through the adhesive layer 1 made of an acrylic binder or the like having fine particles. There is no danger that the degree of adhesion will be deteriorated as in the case where it is formed directly on the surface of the substrate.

The carbon-containing conductive layer 2 is protected by protective layers 3 to 5 made of a urethane-based binder having a high film-forming effect, and does not expose the outer surface. There is no defect such as strength.

FIG. 2 is a partially enlarged cross-sectional view of a second embodiment used for safety shoes.
Is a finish coating layer provided on the silver surface (surface) of the natural leather a.

The finish coating layer c is formed by sequentially laminating an adhesive layer 6, a carbon-containing conductive layer 7, and protective layers 8, 9 on the surface of natural leather a. An example of the composition of each layer is as shown in Table 2,
The adhesive layer 6 is formed by roll coating, and the carbon-containing conductive layer 7 and the protective layers 8 and 9 are all formed by spray coating.

[0017]

[Table 2]

If the carbon concentration is less than 15%, the conductivity of the carbon-containing conductive layer 7 rapidly decreases. Therefore, the carbon-containing conductive layer 7 has a conductivity of at least 15% or more and a resistivity of about 10 MΩ or less. It is desirable to secure.

Although the carbon-containing conductive layer 7 contains carbon, the carbon-containing conductive layer 7 is formed on the surface of the natural leather a through the adhesive layer 6 made of an acrylic binder having fine particles. There is no fear that the degree of adhesion is deteriorated as in the case of being formed directly on the surface of the natural leather a.

The carbon-containing conductive layer 7 is protected by a protective layer 8 made of a urethane-based binder or the like having a high film-forming action and a protective layer 9 containing a nitrocellulose lacquer. There is no defect such as discoloration or strength due to the above.

FIG. 3 is a partially enlarged cross-sectional view of a third embodiment used for clothing, in which a is, for example, natural silvered leather, d
Is a finish coating layer provided on the silver surface (surface) of the natural leather a.

The finish coating layer d is composed of an adhesive layer 10, a carbon-containing conductive layer 11, protective layers 12, 13 on the surface of the natural leather a.
Are sequentially laminated. An example of the composition of each layer is as shown in Table 3, and each layer is formed by spray coating.

[0023]

[Table 3]

If the carbon concentration is less than 15%, the conductivity of the carbon-containing conductive layer 11 rapidly decreases. Therefore, the carbon-containing conductive layer 11 has a conductivity of at least 15% and a resistivity of about 10 MΩ or less. It is desirable to secure.

Although the carbon-containing conductive layer 11 contains carbon, the carbon-containing conductive layer 11 is formed on the surface of the natural leather a through the adhesive layer 10 made of an acrylic binder or the like having fine particles. There is no fear that the degree of adhesion is deteriorated as in the case of being formed directly on the surface of the natural leather a.

The carbon-containing conductive layer 11 has a protective layer 12 made of a urethane-based binder having a high film-forming effect.
13 and does not expose the outer surface, so that there is no defect such as discoloration or strength due to the contamination of carbon.

[0027]

As is apparent from the above description,
According to the present invention, the following effects can be obtained.

The static electricity generated by friction on the surface of the natural leather (more specifically, the surface of the finish coating layer) flows smoothly to the conductive layer containing carbon, and the potential difference on the surface is eliminated. No pleasure. Also, unlike the case where the carbon-containing conductive layer is formed by polymerization on the back surface of natural leather, there is no occurrence of cracking or cracking when the carbon-containing conductive layer is partially peeled off during the finishing treatment in the leather making process. Further, unlike the case where the carbon-containing conductive layer is formed by polymerization directly on the surface of natural leather, there is no possibility that the degree of adhesion is deteriorated or the quality is deteriorated.

Since the carbon-containing conductive layer has a carbon concentration of not less than 15% and a resistivity of about 10 MΩ or less at a paint resin solid content ratio of 15% or more, the conductivity is rapidly reduced as in the case of less than 15%. The desired conductivity can be ensured without any problem. The carbon-containing conductive layer contains carbon, but is formed on the surface of natural leather via an adhesive layer containing an acrylic binder, which is different from the case where the conductive layer is formed directly on the surface of natural leather. Very good adhesion. Since the carbon-containing conductive layer is covered with the pigment-containing protective layer and is not exposed on the outer surface, there is no discoloration due to carbon.

When the pigment-containing protective layer is coated with a protective layer containing a solvent-based urethane paint, a protective layer containing a nitrified cotton lacquer, or a protective layer containing a urethane-based binder,
It is clear that the surface protection of natural leather is further improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a first embodiment of an antistatic natural leather of the present invention used for a seat of an automobile or the like.

FIG. 2 is a partially enlarged sectional view of a second embodiment of the antistatic natural leather of the present invention used for safety shoes.

FIG. 3 shows a third example of the antistatic natural leather of the present invention used for clothing.
It is a partial expanded sectional view of an example.

[Explanation of symbols]

 a Natural leather b-d Finish coating layer 1,6,10 Adhesive layer 2,7,11 Carbon-containing conductive layer 3-5 Protective layer 8,9 Protective layer 12,13 Protective layer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiharu Kubota 6363 Matsuo Arai, Iida City, Nagano Prefecture, Miyauchi Industrial Co., Ltd. 72) Inventor's Market Hiroshi 6363 Matsuo Arai, Iida City, Nagano Prefecture, Miyauchi Industries Co., Ltd. (72) Inventor Muneyuki Shimaoka 6363 Matsuo Arai, Iida City, Nagano Prefecture, Miyauchi Industries Co., Ltd. JP-A-81149 (JP, A) JP-A-2-17734 (JP, A) JP-A-62-90238 (JP, A) JP-A-62-158042 (JP, A) JP-A-3-47913 (JP, Y2) )

Claims (3)

(57) [Claims] 1. An adhesive layer containing an acrylic binder on a surface of natural leather, and a carbon concentration of 15% or less of a paint resin solid content ratio.
% Antistatic natural leather, which is formed by sequentially laminating a carbon-containing conductive layer having a resistivity of about 10 MΩ or less and a protective layer containing a pigment. 2. The antistatic natural leather according to claim 1, wherein a protective layer containing a solvent-based urethane paint or a protective layer containing a nitrified cotton lacquer covers the protective layer containing the pigment. 3. The antistatic natural leather according to claim 1, wherein the protective layer containing a urethane binder covers the protective layer containing the pigment.