WO2012046878A1

WO2012046878A1 - Leather having antifouling property

Info

Publication number: WO2012046878A1
Application number: PCT/JP2011/073595
Authority: WO
Inventors: 麻実子菊地
Original assignee: ミドリホクヨー株式会社
Priority date: 2010-10-06
Filing date: 2011-10-06
Publication date: 2012-04-12
Also published as: JPWO2012046878A1; JP5753181B2

Abstract

Provided is a wear-resistant, flexible overcoat layer for natural leather, said layer being formed primarily from an acrylic resin, having an anti-fouling property against grime associated with automobile interiors, and having a characteristic whereby grime adheres thereto in an easily removable state. The overcoat layer having an antifouling property is characterized by comprising an acrylic resin (10-16% by weight, solid content), an acrylic silica resin (13-22% by weight, solid content), an acrylic polysiloxane resin (25-35% by weight, solid content), an acrylic urethane resin (6-15% by weight, solid content), an urethane resin (4-10% by weight, solid content), a carbodiimide crosslinking agent (5-15% by weight, solid content), a silicone texturizing agent (8-24% by weight, solid content), and a leveling agent/thickener (1-5% by weight) (the total solid content is 100% by weight).

Description

Antifouling leather

The present invention relates to antifouling leather.

Natural leather is used as the skin material for automobile interior parts such as car seats. This is because it is preferred as a high-quality material with high customer satisfaction by touch and vision.
The leather used as a car seat has been developed as a car seat to withstand the environment where it is used as a car seat. Car interiors such as effective car seats are made by applying leather on the surface of leather such as base coat, color coat and top coat after tanning the leather to give flexibility and wear resistance. The parts are almost complete.
As automobiles are used by many people, the demand for car seats has also diversified. Dirt adhering to the car seat due to dyes of clothes worn by automobile users, or splashes and spilled residue from coffee and coffee ketchup etc. in the automobile by automobile users, dust in the air that is the usage environment There are problems such as dust, dirt from automobile exhaust gas soot (carbon black), and the like. Measures against car seats are needed.
Such requirements and countermeasures are required as antifouling leather, unlike coating the surface of leather, and imparting characteristics such as flexibility and abrasion resistance to the surface. A separate solution is required.
In order to meet this demand, it is necessary to develop antifouling leather. The demand for antifouling leather is also caused by the demand for car seats. Specifically, the conventional car seat has used a dark color for maintenance purposes. However, recently, car seats using light-colored colors are highly popular due to design requirements, and as countermeasures against them, it is necessary to prevent dirt from being attached and dirt to be inconspicuous, and to maintain the initial state as much as possible. It has become.
The antifouling imparted leather means leather that has been processed into a state in which deposits are difficult to adhere as described above, and are easily separated when adhered.

As this antifouling leather, the surface of the topcoat layer is overcoated with a chemical obtained by adding a leveling agent to a specific substance (strongly hydrophilic phospholipid 2-methacryloyloxyethylerylphosphorylcholine). An invention can be mentioned (patent document 10 Unexamined-Japanese-Patent No. 2010-116488). This protects the surface of the topcoat layer with the above-mentioned chemicals, thereby imparting antifouling properties to the surface of the topcoat layer.
There are inventions that impart water repellency to the surface of the topcoat layer with a fluorine compound (Patent Document 11 JP 2000-054000 A, Patent Document 12 JP 2009-520087 A, Patent Document 13 JP 08-113800 A Such). This is an invention in which the attached contaminants are washed away with water and returned to the initial state. It is hard to attach the said deposit | attachment which is the characteristic of antifouling property leather, and it cannot be said that it was processed in the state which is easy to leave | separate when adhering, From that point, it is antifouling property leather I can't say that.

As described above, in the present invention, materials used for the top coat layer of natural leather that has been conventionally developed will be described below.
A polyurethane resin is used as a material for forming the top coat layer of the car seat. In addition, the use of acrylic resin is also being studied. Anti-fouling and adherence to dirt in automobiles, although it is expected that the material of acrylic resin will be a topcoat layer that has the characteristics of a substance that is difficult to adhere and easily detached when attached. There is no invention of a topcoat layer that seeks a characteristic capable of removing the stained dirt.

As a resin used for the top coat layer of natural leather, it is known to use acrylic acid ester or methacrylic acid ester or a copolymer containing them (Patent Document 1, JP-A-2008-501830, Patent Document 2). JP 2006-89725, JP-A-8-48732, JP-A-8-48732, JP-A-6-17100, JP-A-4-165000, JP-A-60-141709. Publication, Patent Document 7 US Pat. No. 4,314,800, Patent Document 8 US Pat. No. 4,491,645, Patent Document 9 US Pat. No. 2,746,837).
Acrylic ester or methacrylic ester or a copolymer containing these, which is a resin coating used for the top coat layer, has been noted for its superiority in terms of strength and the like, and has utilized this advantage.
There is an invention that uses an acrylic resin that is included as a composition that does not include a silica matting agent that causes dirt adhesion.
Natural leather is used as a material for car interior parts such as car seats, and it is preferred as a high-quality material.
It is desired to use antifouling leather for acrylic resin, acrylic acid ester, methacrylic acid ester, or the like, which is a resin used for such a top coat layer.
There is a need to provide a new antifouling leather aiming at imparting antifouling properties to a top coat layer of natural leather that has been invented in the past.

Natural leather has a difficulty in maintaining the state of natural leather unless sufficient attention is paid to the conditions and maintenance during use. It is inevitable that the sebum of automobile drivers and users adheres to car seats in the car, and that the dyes of clothes worn (such as jeans dyes) adhere to car seats. Splashes due to coffee or ketchup that are food and drink in the vehicle, and dirt and dust in the air that is the use environment, dirt due to soot (carbon black) of automobile exhaust gas, etc. cannot be avoided. These deposits have the property of being easily adhered and have the property of being difficult to separate from the adhered surface. In particular, car seats have to use dark colors for maintenance, and may not meet the design requirements. In the case of a light-colored car seat, the problem of maintenance is an issue, and it is required to make it possible to make it a natural leather state as much as a dark-colored car seat. The following methods are being considered as countermeasures.

The inventors have made the following invention.
A top that has antifouling properties for dirt inherent to automobile interiors, and that has the property of easily removing attached dirt, and is provided with wear resistance and coating strength. In addition to strength, by adding acrylic resin, acrylic silica resin and acrylic polysiloxane resin together as a coat layer, and further adding a polyurethane resin component, an isocyanate crosslinking agent component and a silicone-based tactile agent, The present inventor is able to obtain a topcoat layer having antifouling property for dirt inherent to the interior of an automobile and having wear resistance and flexibility, which has a characteristic of easily removing attached dirt. Et al. Confirmed by experiment and invented (Japanese Patent Application No. 2009-092344). However, this cannot be said to be sufficient as antifouling leather.

Special table 2008-501830 gazette JP 2006-89725 A JP-A-8-48732 JP-A-6-17100 Japanese Patent Laid-Open No. 4-165000 JP-A-60-141709 U.S. Pat. No. 4,314,800 U.S. Pat. No. 4,491,645 US Pat. No. 2,746,837 JP 2010-116488 A JP 2000-054000 A Special Table 2009-520087, JP-A-8-113800

The problem to be solved by the present invention is that the topcoat layer in the coating layer of natural leather, the conventionally known topcoat layer, or the previously known overcoat layer newly provided on the surface of the topcoat layer As a premise of forming as a resin centered on acrylic resin, it has a further antifouling property against dirt inherent in automobiles, and the attached dirt adheres in a state that is easy to remove It is intended to provide a coating layer of natural leather having wear resistance and flexibility. In the inventions of the present inventors, this is not sufficient, and it provides (1) further improving the antifouling performance, and (2) maintaining the physical properties (such as wear resistance) necessary for automobile seat leather. That is.

(1) The inventors have improved the following points and completed a new natural leather that imparts antifouling properties to the coating film. In the present invention, the following two layers were formed by fully exhibiting the performance of the acrylic resin, which is considered to be antifouling in the topcoat layer.
(A) Acrylic resin (3 to 15% by weight, solid content), acrylic silica resin (15 to 20% by weight, solid content), acrylic polysiloxane resin (15 to 20% by weight, solid content), acrylic urethane resin (10 ~ 15 wt%, solid content), urethane resin (8-13 wt%, solid content), isocyanate cross-linking agent (20-30 wt%, solid content) and silicone-based tactile agent (8-15 wt%, solid content) An antifouling-imparting leather characterized in that a coating layer comprising (total solid content of 100% by weight) is provided as a top coat layer of natural leather.
(A) Acrylic resin (3 to 15% by weight, solid content), acrylic silica resin (15 to 25% by weight, solid content), acrylic polysiloxane resin (20 to 40% by weight, solid content), urethane resin (5 to 5%) 15 wt%, solid content) and an isocyanate cross-linking agent (20 to 35 wt%, solid content) (more than 100 wt% in total solid content) provided as a top coat layer of natural leather Anti-fouling leather to give natural leather.
(2) Base coat and color coat are applied to the surface of natural leather, the top coat is formed on the surface of the color coat, and an antifouling coating film is formed to impart antifouling properties to the top coat. It is by doing. This was able to obtain a certain evaluation in terms of antifouling imparted leather. However, the following problems were pointed out.
(3) (a) Is it possible to expect further improvement in antifouling performance?
The antifouling performance is evaluated as follows. A dry (wet) and wet (wet) jeans fabric is rubbed against the sample to make it soiled and then wiped off. After the dirt is attached and after wiping, the degree of the dirt is visually determined using a gray scale. It is judged that the larger the value is, the less dirty (high antifouling property). After wet dirt adheres, it is grade 3 (the highest grade is grade 5), and I would like this point to be improved. In addition, the evaluation after wet wiping is extremely high in grades 4 to 5, but in order to develop a coating film having a higher level of antifouling performance, it is necessary to introduce a stricter evaluation method. .
(A) The point of abrasion resistance (Weisen beak) is not sufficient. Specifically, the friction element is brought into contact with the test piece and reciprocated, and evaluation is performed by the number of times until the coating film is peeled off and the base is visible. This value is not enough compared to leather that does not consider antifouling, so I would like you to improve it.
(4) In order to point out the problem (a), it was considered that a new topcoat layer was obtained by improving the components and amount of the conventional topcoat layer to solve the problem.
Specifically, in place of using a urethane resin, the use of an acrylic urethane resin mixed with an antifouling acrylic resin and the use of an acrylic resin were studied.
Also, the silica matting agent used as a matting agent has sharp irregularities and causes dirt adhesion, so avoid using it and considering the use of acrylic polysiloxane resin in terms of a smooth and antifouling matting agent did. We tried to improve the water repellency by using silicone touch.
However, with respect to the problem (a), the antifouling coating film (antifouling coating film) has a low coating film strength, and therefore, when used as a top coat, the conventional high wear resistance is the main focus. Compared to the top coats that have been developed, it has proved difficult to avoid being fragile.
Therefore, an overcoat layer is provided on the surface of the topcoat layer, which has been used conventionally and has no effect in terms of antifouling, but is superior in terms of wear resistance, thereby preventing the overcoat layer. If it is a dirty coating, the topcoat layer will retain sufficient wear resistance, and the overcoat layer will be a coating with antifouling properties to solve the problem of insufficient wear resistance. I thought it was possible. According to this solution, although the wear resistance is improved by the top coat, the overcoat layer responsible for the antifouling performance may be lost due to friction and the antifouling performance may be reduced. The coating film strength is weak, and there is no problem because part of the coating is not scraped off and remains antifouling. Compared to the case where an antifouling coating film is formed as a top coat layer on the surface of a soft color coat, it is advantageous also in terms of durability of the antifouling performance.
(5) The coating film component and the amount of the component are to be solved by various combinations and have been found to be effective for the following types of coating layers.
(6) (A) The coating film layer using the isocyanate type crosslinking agent which is a conventional crosslinking agent is as follows.
The coating layer of claim 1 comprises an acrylic silica resin (13 to 19% by weight, solid content), an acrylic polysiloxane resin (25 to 31% by weight, solid content), and an acrylic urethane resin (9 to 13% by weight, solid content). , Urethane resin (5 to 9% by weight, solid content), isocyanate-based crosslinking agent (20 to 26% by weight, solid content), silicone-based tactile agent (8 to 12% by weight, solid content), leveling agent and thickener An antifouling leather coating layer comprising (3 to 8% by weight) (total solid content is 100% by weight).
(7) (A) An overcoat layer using a carbodiimide-based crosslinking agent as the crosslinking agent and not using an acrylic resin is as follows.
The coating layer of claim 2 comprises an acrylic silica resin (13 to 22% by weight, solid content), an acrylic polysiloxane resin (25 to 35% by weight, solid content), an acrylic urethane resin (9 to 15% by weight, solid content) ), Urethane resin (6 to 10% by weight, solid content), carbodiimide cross-linking agent (6 to 15% by weight, solid content), silicone-based tactile agent (9 to 13% by weight, solid content), leveling agent / thickening agent An antifouling leather coating layer comprising an agent (3 to 8% by weight) (total solid content is 100% by weight).
(8) (c) A coating film layer using a carbodiimide-based crosslinking agent and an acrylic resin as a crosslinking agent is as follows.
The coating layer of claim 3 comprises an acrylic resin (10 to 16% by weight, solid content), an acrylic silica resin (13 to 22% by weight, solid content), an acrylic polysiloxane resin (25 to 35% by weight, solid content), Acrylic urethane resin (6-15% by weight, solid content), urethane resin (4-10% by weight, solid content), carbodiimide crosslinking agent (5-15% by weight, solid content), silicone tactile agent (8-24) And a leveling agent / thickening agent (1 to 5% by weight) (over 100% by weight in total solid content).
(9) to (11) A natural leather characterized in that the antifouling leather coating layer (6) to (8) is used as a topcoat layer.
(12) to (14) A natural leather characterized in that the antifouling leather coating layer (6) to (8) is used as an overcoat layer.
(15) In the case of the topcoat layer and the overcoat layer, the antifouling performance of the antifouling leather by the conventionally used acrylic resin or resin containing an acrylic resin component is improved, and the wear resistance is improved. We succeeded in measuring. Specifically, the antifouling performance (wet) of the antifouling leather is improved from the third grade to the fifth grade (4th grade to fifth grade after wiping) compared to the conventional antifouling leather, and the wear resistance is dry 230 It was improved from 300 times to 300 times and from wet 100 times to 230 times.

A new top coat layer was provided on the surface of the color coat layer as a natural leather coating layer. As a result, the layer made of a resin mainly made of acrylic resin exhibits antifouling properties for dirt inherent to the interior of conventional automobiles, and a new carbodiimide cross-linking agent is used for the topcoat layer. Dirt can be made difficult to enter. Moreover, the state of cross-linking was improved and the film strength could be improved. The water repellency could be improved by increasing the amount of silicone-based tactile agent used. As a result, it was possible to make it easy to repel dirt on the denim and to make it difficult to adhere, and it was possible to make the structure easy to wipe off even after adhering.
Furthermore, by forming a coating layer of the above composition as an overcoat layer on the surface of a conventional top coat with excellent wear resistance, excellent antifouling properties (stains are difficult to adhere to and have not been observed). The soil had a property of being easily removed and attached, and in addition, a coating layer of natural leather having excellent wear resistance and flexibility could be obtained.

FIG. 1 is a diagram showing a friction tester to be used.
FIG. 2 is a view showing a friction element of a friction tester used for a soil test method.
FIG. 3 is a view showing a test piece for measuring a color difference between a portion without dirt and a portion with dirt by a colorimeter.
[FIG. 4] A view showing a test piece for measuring a color difference between two parts by wiping off a part of dirt on a part where dirt is adhered.
FIG. 5 is a cross-sectional view of a coating layer. (A) FIG.
(B) It is a figure without antifouling overcoat.
FIG. 6 is a surface view of the coating layer after contamination (jeans, wet),
(A) It is a figure without antifouling overcoat.
(B) It is a figure with antifouling overcoat.

The natural leather manufacturing process is as follows.
The process of producing natural leather consists of a preparation process for tanning leather, a tanning process with chromium or a chromium-free tanning agent, and a reprocessing with a synthetic tanning agent such as formaldehyde condensates of aromatic sulfonic acids (mainly naphthalene and phenol sulfonic acids). Natural leather manufactured by a series of processes consisting of a tanning / dyeing / greasing process followed by a drying process and a finishing process. The retanning / dying / greasing process and the subsequent drying process are setters. Process, dry drying process, taste-removal process, vibration process and buffing process. After going through the backing process, improving the wear resistance and adjusting the color when natural leather is used for car seats and automotive interior parts. For example, the following three layers of coating are formed. A series of processes for producing natural leather is completed through a process of forming a base coat layer, a process of embossing, a process of forming a color coat layer, a process of forming a top coat layer, a vibration process, and a blanking process. .
Although these steps are being improved with respect to individual conditions and combinations of steps, the operations performed in each step are independent and almost determined, and are known steps.

The coating film which is the subject of the present invention is the top coat layer on the surface, and how to form a paint made of a resin that forms the top coat layer is an important technical theme.
The top coat layer is formed on the base coat layer and the color coat layer. Regarding the explanation of the present invention, a base coat layer forming step, a color coat layer forming step, and a top coat layer forming step will be described.

(1) The base coat layer corresponds to the lowermost layer of the paint film layer, and is a layer for preparing to flatten the unevenness on the surface of the leather and stably form the layer on the upper part. In forming this layer, a composition comprising a resin, a pigment, an auxiliary agent, a crosslinking agent, a tactile agent and water is applied to the surface of the leather. The ratio of the resin, pigment, auxiliary agent, cross-linking agent, and tactile agent, which is a solid content, is 45 to 75:10 to 30: 0 to 15: 0 to 20: 0 to 10 (total 100%, weight ratio). As the resin, a two-component polyurethane resin is used. A pigment of a color to be colored is used as the pigment. Auxiliaries include surfactants, thickeners, regulators, matting agents and the like. Resins, pigments, auxiliaries, touching agents and leveling agents, and the water content are 20 to 40:80 to 60 (total 100%, weight ratio). As a coating method, brush coating, spraying, curtain coating, and roll coating are appropriately selected and used in a state containing an aqueous solution. The coating amount is 40 to 150 g / m ² , and water is evaporated by applying warm air to the surface after coating. The film thickness is 10 to 50 μm.
Next, embossing is performed. Embossing is a process that creates unevenness on the leather surface with a high-pressure press, and gives various patterns (textures) to the leather. Next, the leather fibers are loosened and the texture is adjusted by an emptying process and a vibration process.

(2) The color coat layer is an intermediate layer of the coating film, and is a layer for causing pigments and dyes for coloring the leather to exist, and is provided on the upper part of the base coat as viewed from the leather. In forming this layer, a composition comprising a resin, a pigment, an auxiliary agent, a crosslinking agent, a tactile agent and water is applied to the surface of the leather. The ratio of the resin, pigment, auxiliary agent, cross-linking agent, and tactile agent, which is a solid content, is 45 to 75:10 to 30: 0 to 15: 0 to 20: 0 to 10 (total 100%, weight ratio). As the resin, a two-component polyurethane resin is used. A pigment of a color to be colored is used as the pigment. Auxiliaries include surfactants (leveling agents, etc.), thickeners, regulators and the like. Resins, pigments, auxiliaries, touching agents, and the water content are 20 to 40:80 to 60 (total 100% by weight). As a coating method, brush coating, spraying, curtain coating, and roll coating are appropriately selected and used in a state containing an aqueous solution. The coating amount is 20 to 70 g / m ² , and water is evaporated by applying warm air to the surface after coating. The film thickness is 5 to 25 μm.

(3) A top coat layer is formed on the surface of the color coat layer.
The following topcoat layers were employed.
"Base coat layer on the surface of natural leather, color coat layer on the surface, urethane resin (45 to 59 wt%, solid content), isocyanate cross-linking agent (22 to 30 wt%, solid content), silica matting agent on the surface (10 to 16% by weight, solid content), silicone tactile agent (5 to 9% by weight, solid content), leveling agent / thickening agent (1 to 3% by weight, solid content) Leather with antifouling property consisting of a coating layer consisting of
Specific contents and properties are shown as Comparative Example 1.
In the present invention, the performance required as a topcoat layer for overcoating the antifouling coating film is wear resistance, and the composition is not limited to the above composition as long as it has sufficient wear resistance. Regarding the abrasion resistance of the topcoat layer, if the result measured by the Weisenbeak method is 170 times or more dry and 100 times or more wet, it can be used favorably as leather for car seats. However, for the purpose of improving the wear resistance of the antifouling coating film formed as the overcoat layer, it is required to be superior to the wear resistance of the overcoat layer.

Comparative Example 2 shows an example of a conventional topcoat layer mainly composed of an acrylic resin to improve the antifouling property.

Comparative Example 3 shows another example of a conventional topcoat layer mainly composed of an acrylic resin to improve the antifouling property.

(A) The coating layer using the isocyanate type crosslinking agent which is a conventional crosslinking agent is as follows.
The coating layer of claim 1 comprises an acrylic silica resin (13 to 19% by weight, solid content), an acrylic polysiloxane resin (25 to 31% by weight, solid content), and an acrylic urethane resin (9 to 13% by weight, solid content). , Urethane resin (5 to 9% by weight, solid content), isocyanate-based crosslinking agent (20 to 26% by weight, solid content), silicone-based tactile agent (8 to 12% by weight, solid content), leveling agent and thickener This is a coating layer comprising (3 to 8% by weight) (total solid content is 100% by weight).
The specific properties when the coating layer of claim 1 is formed as a topcoat layer on the surface of the color coat layer and when it is formed as an overcoat layer on the topcoat layer of the comparative example 1 are described in Example 1. Shown in

(A) The coating layer which uses an isocyanate type crosslinking agent for a crosslinking agent and does not use an acrylic resin is as follows.
“(Claim 1) As components containing acrylic resin, acrylic silica resin (13 to 19% by weight, solid content), acrylic polysiloxane resin (25 to 31% by weight, solid content), acrylic urethane resin (9 to 13% by weight) %, Solid content), it is possible to obtain a matte coating film made of acrylic resin. "
At the same time, it is useful for preventing dirt associated with the use of automobiles such as car seats, and even if dirt is attached, the result is easy to remove.
The coating film strength is improved as compared with the case of using only acrylic resin as acrylic urethane resin (9 to 13% by weight, solid content) and urethane resin (6 to 9% by weight, solid content). By using an isocyanate-based crosslinking agent (20 to 26% by weight, solid content), the crosslinking state is improved.
Since the use of the silica matting agent has sharp irregularities and causes the adhesion of dirt, an acrylic polysiloxane resin having a matting effect and smooth and difficult to adhere to dirt is employed to enhance the antifouling property.
By using a silicone-based tactile agent (8 to 24% by weight, solid content), it is possible to improve tactile sensation and slipperiness, which are problems due to components formed mainly from an acrylic resin. Further, water repellency is imparted to make it difficult to adhere dirt.
The specific properties when the coating layer of claim 1 is formed as a topcoat layer on the surface of the color coat layer are shown in Example 1.
As a result, antifouling performance (after dry contamination) is grade 4-5, antifouling performance (after dry wiping) is grade 4-5, antifouling performance (after wet contamination) is grade 2, antifouling performance (after wet contamination) ) Was graded 3 to 4, and it was confirmed that the same or higher effects were obtained.
It is a dry (times) 170 when used as a top coat for wear resistance, and a wet (times) 100 when used as a top coat for wear resistance.

(A) The coating layer which uses a carbodiimide type crosslinking agent for the crosslinking agent and does not use an acrylic resin is as follows.
Claim 2 is as follows.
Acrylic silica resin (13-22% by weight, solid content), Acrylic polysiloxane resin (25-35% by weight, solid content), Acrylic urethane resin (9-15% by weight, solid content), Urethane resin (6-10) % By weight, solid content), carbodiimide-based crosslinking agent (6-15% by weight, solid content), silicone-based tactile agent (9-13% by weight, solid content), leveling agent / thickening agent (3-8% by weight) A coating layer comprising (total solid content of 100% by weight).
The specific properties when the coating layer of claim 2 is formed as a topcoat layer on the surface of the color coat layer and when it is formed as an overcoat layer on the topcoat layer of Comparative Example 1 are described in Example 2. Shown in
As a result, antifouling performance (after dry contamination) is grade 4-5, antifouling performance (after dry wiping) is grade 4-5, antifouling performance (after wet contamination) is grade 3, antifouling performance (after wet wiping) ) Was grade 4, and it was confirmed that the same or higher effect was obtained.
Carbodiimide is used as a cross-linking agent to maintain a dense state and prevent water from entering, thereby improving water resistance and suppressing entry of dirt substances (such as dyes) dissolved in water into the coating film. It was dry (times) 180 when used as a top coat, and wet (times) 110 when used as a top coat in terms of abrasion resistance.

Components containing acrylic resin include acrylic silica resin (13-22% by weight, solid content), acrylic polysiloxane resin (25-35% by weight, solid content), acrylic urethane resin (9-15% by weight, solid content) The effect of using is the same as in the first embodiment.
Further, the effect of using acrylic urethane resin (9 to 15% by weight, solid content) and urethane resin (6 to 10% by weight, solid content) is the same as in Example 1. A major feature of Example 2 is the use of a carbodiimide-based crosslinking agent (6 to 15% by weight, solid content), which improves the crosslinking state and makes it difficult for dirt substances to enter the coating film.
The use of a silica matting agent causes dirt adhesion. Acrylic polysiloxane resin is used and an antifouling matting agent is used.
By using a silicone-based tactile agent (8 to 24% by weight, solid content), it is possible to improve tactile sensation and slipperiness, which are problems due to components formed mainly from an acrylic resin. Further, water repellency is imparted to make it difficult to adhere dirt.

(C) A coating layer using a carbodiimide-based crosslinking agent and an acrylic resin as a crosslinking agent is as follows.
“(Claim 3)
Acrylic resin (10-16 wt%, solid content), acrylic silica resin (13-22 wt%, solid content), acrylic polysiloxane resin (25-35 wt%, solid content), acrylic urethane resin (6-15 wt%) %, Solid content), urethane resin (4 to 10% by weight, solid content), carbodiimide crosslinking agent (5 to 15% by weight, solid content), silicone tactile agent (8 to 24% by weight, solid content) and leveling A coating layer comprising an agent / thickening agent (1 to 5 wt%) (total solid content is 100 wt%). "
Example 3 shows specific properties when the coating layer of claim 3 is formed as a topcoat layer on the surface of the color coat layer and when it is formed as an overcoat layer on the topcoat layer of Comparative Example 1. And 4.
In Example 3, grade 5 for antifouling performance (after dry contamination), grade 5 for antifouling performance (after dry wiping), grades 3 to 4 for antifouling performance (after wet wiping), antifouling performance (after wet wiping) ) Was grade 4-5, and it was confirmed that the same or higher effects were obtained.
It was dry (times) 170 when used as a top coat for wear resistance, and wet (times) 100 when used as a top coat for wear resistance.
In Example 4, antifouling performance (after dry contamination) 4 to 5 grade, antifouling performance (after dry wiping) 5 grade, antifouling performance (after wet contamination) 3 to 4 grade, antifouling performance (wet) After wiping off, it was grade 4, and it was confirmed that the same or higher effect was obtained.
It was dry (times) 180 when used as a top coat in terms of wear resistance, and wet (times) 110 when used as a top coat in terms of wear resistance.

Components mainly formed of acrylic resin include acrylic resin (10 to 16% by weight, solid content), acrylic silica resin (15 to 22% by weight, solid content), acrylic polysiloxane resin (25 to 35% by weight, solid content) Min) and acrylic urethane resin (6 to 15% by weight, solid content).
A frosted state can be obtained by adding an acrylic silica resin, an acrylic polysiloxane resin, and an acrylic urethane resin to the acrylic resin, and at the same time, compared to the case of using only the acrylic resin, the acrylic silica resin and the acrylic resin By using an acrylic polysiloxane resin or an acrylic urethane resin, it is useful for preventing dirt associated with the use of an automobile such as a car seat, and at the same time, it is easy to remove even if dirt is attached.
As an acrylic urethane resin (9 to 15% by weight, solid content) and a urethane resin (4 to 10% by weight, solid content), flexibility is improved as compared with the case of using only an acrylic resin. By using a carbodiimide-based crosslinking agent (5 to 15% by weight, solid content), the crosslinking state is improved.
The use of a silica matting agent causes dirt adhesion. Adopt acrylic polysiloxane resin and use antifouling matting agent.
By using a silicone-based tactile agent (8 to 24% by weight, solid content), it is possible to improve tactile sensation and slipperiness, which are problems due to components formed mainly from an acrylic resin. Further, water repellency is imparted to make it difficult to adhere dirt.

By forming the above coating layer as a top coat layer on the surface of the color coat layer, the antifouling performance of the antifouling leather with an acrylic resin or a resin containing an acrylic resin component could be improved. Furthermore, by forming the above coating layer as an overcoat layer on the surface of the topcoat layer of Comparative Example 1, it was possible to improve the abrasion resistance in addition to the antifouling property. With respect to the adhesion of the denim dirt, it was possible to make the dirt easy to repel, to make it difficult to adhere, and to make the structure easy to wipe off even after adhering. When a carbodiimide cross-linking agent was used, when the cross-linking was formed, the overcoat layer had a high cross-linking speed and a high cross-linking density. As a result, it was possible to make it difficult for dirt to enter the overcoat layer. The state of cross-linking was improved and the coating film strength could be improved. In addition, the coating film using carbodiimide crosslinking agent has a difficulty in recoating (recoating) because the affinity of the coating film is low, but by overcoating, color correction is completed at the top coat stage and overcoating. By not coloring the coating layer, there is no need for recoating (overcoating). The antifouling performance (wet) of antifouling leather is improved from 2nd grade to 4th grade (4th grade to 5th grade after wiping) compared with conventional antifouling leather, and wear resistance is 230 to 300 times or more dry. Improved from wet 100 times to 230 times.

A cross-sectional view of the coating layer by an optical microscope is shown in FIG.
The left side shows the state of a conventional antifouling top coat. The right side shows an overcoat layer with an antifouling coating.

The surface figure (FIG. 6) of the coating layer after the contamination by an optical microscope (jeans, wet) is shown.
The left side is a surface view when a conventional coating film that is not an antifouling coating film is formed. The right side is a surface view when a coating film is formed by the antifouling coating film of the present invention. It can be seen that the left side is heavily soiled. The right side shows that there is little dirt on the whole and that dirt is collected in part. The dirt is considered to be a dye or the like.

Hereinafter, each component for forming a natural leather coating film will be described in order to form a top coat layer and an overcoat layer.

About Acrylic Resin Component Conventionally known acrylic resin components can be used.
Specifically, it includes (1) (a) a component composed of acrylic acid ester and / or methacrylic acid ester, and (b) a component composed of acrylic acid and / or methacrylic acid, and is obtained by emulsion polymerization of these components. Polymer. In addition, the components contained in the components (c) to (e) described below can include any components.
(C) a component consisting of glycidyl acrylate and / or glycidyl methacrylate, (d) a component consisting of hydroxyethyl acrylate and / or hydroxyethyl methacrylate, and (e) a component consisting of ethylene glycol dimethacrylate and / or diethylene glycol dimethacrylate. is there. It is a polymer obtained by mixing the above components and emulsion polymerization.

(1) The above-mentioned components (a) to (e) are mixed and emulsion polymerization is performed as follows.
(A) a component comprising an acrylic ester and / or a methacrylic ester (the carbon number of the alcohol component in the ester is 1-8),
(B) a component comprising acrylic acid and / or methacrylic acid,
(C) a component comprising glycidyl acrylate and / or glycidyl methacrylate,
(D) a component composed of hydroxyethyl acrylate and / or hydroxyethyl methacrylate, and (e) a component composed of ethylene glycol dimethacrylate and / or diethylene glycol dimethacrylate.
The total amount of the solid content of the component a obtained is 90 to 99% by weight, and the solid content of one component selected from the components b, c, d and e is 10 to 1% by weight (solid content is 100% by weight in total) . Emulsion polymerization of these in the presence of a surfactant in the form of an aqueous solution containing hydrogen peroxide, ascorbic acid and alkali persulfate in the presence or absence of iron sulfate (II) at a pH of less than 7. Thus, an acrylic resin component can be obtained (JP-A-60-141709, JP-A-4-165000).
The acrylic monomer will be described. The acrylic monomer is not particularly limited as long as it is capable of radical polymerization, and examples thereof include 1 to carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, octyl, 2-ethylhexyl of acrylic acid or methacrylic acid. Methacrylic acid alkyl ester or acrylic acid ester having 8 alkyl groups.
The starting materials (b) to (e) are known substances, and the compounds are used.

(2) An example of graft polymerization is as follows.
A graft polymer in which ethyl methacrylate is graft-polymerized on a basic polymer composed of ethyl acrylate / methacrylic acid, and each weight ratio is 69.65: 0.35: 30.
An emulsified solution consisting of 3.1 g of sodium salt of para-toluenesulfonate having 15 carbon atoms, 0.62 g of ammonium peroxysulfonate, 0.84 mg of FeSO _{4 and} 566 g of water, containing 300 g of ethyl acrylate and 1.51 g of methacrylic acid as Warm to 0 ° C. and mix with 0.31 g of Na ₂ Fe ₂ O _{5 in} the presence of nitrogen gas, an inert gas. The temperature is raised to 103 ° C. for 8-10 minutes. Then 129 g of ethyl methacrylate are added dropwise within 15 minutes. In the final stage, the mixture is stirred for 60 minutes at 90 ° C., cooled, the dispersion is taken out, and ammonia is blown in to obtain a transparent film-like graph and polymer.
Similarly, an emulsion comprising 272 g of ethyl acrylate, 8 g of methacrylic acid as an emulsifier, 3 g of sodium salt of p-toluenesulfonate having 15 carbon atoms, 0.62 g of ammonium peroxysulfonate, 0.8 mg of FeSO ₄ and 566 g of water, Warm to 0 ° C. and mix with 0.31 g of Na ₂ Fe ₂ O _{5 in} the presence of nitrogen gas, an inert gas. The temperature is raised to 95 ° C. for 8-10 minutes. Then 129 g of ethyl methacrylate are added dropwise within 15 minutes. In the final stage, a graft polymer obtained by graft polymerization of ethyl methacrylate on a basic polymer composed of ethyl acrylate / methacrylic acid, each having a weight ratio of 68.25: 2: 30 is obtained (Japanese Patent Laid-Open No. 6-17100). No., JP-A-8-48732).

All of these are known substances and can be purchased and used as appropriate. Specifically, Clariant's Merio Resin A-966, Merio Resin A-967, Aqualen. Top 2005, Aqualen. Top2006, Lanxess, SB300, Hydrochlor CR-15, BASF Corial
Examples include binder and LEPTON PROTECTOR SR.

Acrylic silica resin A homogenized mixture of silica and acrylic resin is used.
An example is as follows.
A coating composition in which at least one surface-modified silicon dioxide is mixed based on an acrylate and adjusted to a structural viscosity (JP 2006-002152 A, JP 2006-002151 A).
The silicon dioxide is selected from the group consisting of precipitated silica, pyrogenic silica, silica gel, modified pyrogenic silica and mixtures of said silicon dioxide. The surface of silicon dioxide is modified with at least one polymer, which is referred to as surface modified silicon dioxide. The silica produced on the basis of pyrogenic silica is in this case a silica that can be produced on the basis of pyrogenic silica described in DE 2414478.
In the surface modification, in the case of silicon dioxide whose surface is chemically modified by an organic component, at least a part of the surface of at least a part of the silicon dioxide particles is coated with a surface modifier.
A paint formulation was prepared, surface-modified silicon dioxide was added, and the finished paint formulation was stored at 23 ° C. and 50% relative humidity for 1 day before being slightly stirred and sheared (6 Rotation / minute). The slightly sheared state corresponds to the kinematic viscosity measured at room temperature at 6 revolutions / minute using a Haake viscometer 6R. The strongly sheared state corresponds to the kinematic viscosity measured at room temperature with a Haake viscometer 6R at 60 revolutions / minute.
The paint formulation was slightly sheared after producing the paint formulation, adding surface-modified silicon dioxide, and storing the finished paint formulation at 23 ° C. and 50% relative humidity for 1 day. Under the viscosity of the paint formulation according to the invention measured in the state (6 revolutions / min), the paint formulation is produced and the finished paint formulation is stored for one day at 23 ° C. and 50% relative humidity And up to 15% lower than the viscosity of the same coating formulation without surface-modified silicon dioxide, measured in a slightly sheared state (6 rev / min).
The paint formulation is preferably a thixotropic, solvent-containing painter paint having a thixotropy index TI 6/60 of 2.4 and an aqueous dispersion paint adjusted to structural viscosity, preferably 1 It contains at least one surface-modified silicon dioxide having a thixotropic index TI 6/60 of ≧ 6 and a proportion of 0.5 to 15% by weight, preferably 1 to 10% by weight.
Typical paint formulations in the sense of the present invention are based on alkyd resins, adjusted to thixotropes, solvent-containing paints, and structural viscosities based on acrylates, acrylates / polyurethanes or mixtures thereof. An aqueous dispersion paint or an aqueous dispersion clear paint, adjusted to a matte paint formulation.

These are all known substances and can be purchased and used as appropriate. Specific examples include Hydrolac AD-1 manufactured by Lanxess, RA-2398, RA-8895 manufactured by Sthal, and the like.

Components of acrylic polysiloxane resin A mixture of acrylic resin and polysiloxane results in a uniform state. A specific example is as follows.
For example, the following acrylic polysiloxane resins are known (Japanese Patent Laid-Open No. 2007-09953).
“The following general formula (I)
[Wherein R ¹ , R ² and R ³ are each a monovalent hydrocarbon group or monovalent halogenated hydrocarbon group having 1 to 20 carbon atoms, and Y is an organic group containing a radical reactive group or an SH group. X is a hydrogen atom, a monovalent lower alkyl group or a group represented by the formula R ¹ R ² R ⁴ Si (R ⁴ is R ¹ or Y, and R ¹ , R ² and Y are the same as above. M is an integer of 1 to 10,000, and n is an integer of 1 or more. ] One or two or more oil-in-water emulsions of the organopolysiloxane represented by formula (2)

(Wherein R ⁵ is a hydrogen atom or a methyl group, R ⁶ is an alkyl group having 1 to 18 carbon atoms or an alkoxy-substituted alkyl group), and is selected from acrylic monomers and methacrylic monomers The monomer or mixed monomer containing 70% by mass or more of the total amount of the component (2), the organopolysiloxane of the component (1) and the component of the component (2) A monomer or mixed monomer is added so as to have a mass ratio of 5:95 to 95: 5 to obtain a graft copolymer emulsion obtained by emulsion graft copolymerizing the component (2) with the organopolysiloxane. Further, it is mixed with the following polysiloxane.
The following average composition formula (III)

^{_{^{_{_{R 7 a R 8 b Si (}}}}} OH) p (OX) q O (4-a-b-p-q) / 2
(However, R ⁷ represents an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R ⁸ represents a substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and X represents 1 to 6 carbon atoms. Represents a monovalent hydrocarbon group, a, b, p, q are 0.50 ≦ a ≦ 1.80, 0 ≦ b ≦ 1.00, 0 <p ≦ 1.50, 0 ≦ q ≦ 0.50, respectively. , 0.50 ≦ a + b ≦ 1.80, 0 <p + q ≦ 1.50, 0.50 <a + b + p + q ≦ 2.0 represents a positive number satisfying the range.)
The coating composition which mix | blended the silicone resin shown by these, and a radically polymerizable vinyl monomer, and mix | blended the silicone resin containing emulsion obtained by emulsion polymerization.

These are known substances that can be purchased and used as appropriate.
Specific examples include A-1000 and A-2000 manufactured by Lanxess.

About Acrylic Urethane Resin The combination of acrylic urethane resins is as follows (Japanese Patent Laid-Open No. 05-209150) as an example of the following cases.
Mix and homogenize acrylic resin and polyurethane resin.
The acrylic resin is as follows.
I. 20-50 parts by weight of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, or 4-hydroxyacrylate Hydroxybutyl or a mixture thereof;
II. 30 to 70 parts by weight of styrene or methyl methacrylate, or a mixture thereof;
III. 9.5-30 parts by weight of butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, or mixtures thereof; and IV. 0.5 to 20 parts by weight of a maleic acid half ester having 4 to 8 carbon atoms in an acrylic acid, methacrylic acid or alcohol component; 25-60 parts by weight of 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxy methacrylate Propyl, or mixtures thereof; and V. 0.1 to 10 parts by weight of a maleic acid half ester having 4 to 8 carbon atoms in an acrylic acid, methacrylic acid or alcohol component; 10-30 parts by weight of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, or 4 methacrylates -Hydroxybutyl or mixtures thereof;
Polyurethane (a) (2) (which includes the prepolymers described above) has the formula Q (NCO) _{2 wherein} Q is an aliphatic hydrocarbon group having 4 to 12 carbon atoms, A cycloaliphatic hydrocarbon group having 6 to 15 carbon atoms, an aromatic hydrocarbon group having 6 to 15 carbon atoms, or an araliphatic hydrocarbon group having 7 to 15 carbon atoms. It is produced from diisocyanates having Examples of suitable diisocyanates include tetramethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 4,4'-diisocyanatodicyclohexylmethane, 4,4'-diisocyanato-dicyclohexylpropane- (2,2), 1,4-diisocyanatobenzene, 2,4- and 2,6-diisocyanatotoluene, 2,4'- and 4,4'-diisocyanatodiphenylmethane, 4,4-6-diisocyanato-diphenylpropane- (2,2), p-xylylene diisocyanate, and α, α, α ', α'- Tetramethyl-m- or -p-xylylene diisocyanate Sulfonates, and mixtures of these compounds.

These are known substances that can be purchased and used as appropriate.
Specific examples include Lanxess, Hydrolac TS, Sthal, WT-7371, CT-13-373, CT-13-372, Chuo Rika Co., Ltd., SU-U0603, SU-U0505, and the like. .

Urethane resin The two-part aliphatic polyurethane is as follows.
The two-component aliphatic polyurethane referred to here is aqueous and is used as a paint.
When forming a coating film on natural leather, an aqueous polyol and an aqueous polyaliphatic isocyanate are mixed and reacted at the time of use.
Although the two-part aliphatic polyurethane has a problem of pot life in which it is necessary to proceed with processing such as coating work within a certain time, in the case of the present invention, processing of natural leather takes about 6 hours. It does not cause any problems as work. The finished coating film has an advantage that a stabilized one is obtained and the coating film does not turn yellow.
The aqueous polyaliphatic isocyanate is produced as follows.
Aliphatic isocyanates such as 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,5-diisocyanato-2,2-dimethylpentane, 2,2,4- and 2,4,4- Modification of aliphatic isocyanates such as isocyanates such as trimethyl-1,6-diisocyanatohexane, 1,10-diisocyanatodecane, etc. to modify uretdione groups, isocyanurate groups, urethane groups, allophanate groups, burette groups and / or The polyisocyanate mixture is prepared by reacting with a polyisocyanate having an oxadiazine group and reacting with a polyalkylene oxide polyether alcohol containing an ethylene oxide unit (described in Japanese Patent No. 2961475).
As the aqueous polyol, dimethylolbutanoic acid, dimethylolpentanoic acid, dimethylolheptanoic acid, dimethyloloctanoic acid, and dimethylolnonanoic acid, which are carboxyl group-containing diols, can be used. Among them, dimethylolbutanoic acid, dimethylolheptanoic acid, and dimethylolnonanoic acid are preferable from the viewpoint of industrial cost and the like, and dimethylolbutanoic acid is most preferable. A carboxyl group-containing diol can be obtained by a known synthesis method, and is usually obtained by subjecting an alkylaldehyde to an aldol condensation of a formalin in the presence of a basic catalyst and then oxidizing a aldehyde group by acting a peroxide ( (It is described in Japanese Patent No. 349396, JP-A-8-359884, etc.).
NCO / OH when mixing is in the range of 1.3 to 1.5.
The polyisocyanate component is completely reacted with the polymer polyol and the low molecular weight chain extender to obtain a polyurethane. A solvent that can be optionally separated thereafter is used.
Also, the group that can be neutralized is converted to a salt form and a dispersion is produced using water. Depending on the degree of neutralization and ionic group content, the dispersion can be dispersed very finely so as to have a substantially solution appearance.

These are all known substances and can be purchased and used as appropriate. Specifically, Lanxess, HAT, 51UD, 61UD, 85UD, HydrololHW, Stahl, RU-6125, RU-13045, RU-22063, RU-22063, WT-13-486, WT-13-985 WT-2524, WT-13-492, manufactured by Toupe, UW Clear # 7, manufactured by BASF, FinishPF, FinishPUM, FinishPFM, FinishPUMN, MattingHS, MattingMA, and Prol9595 manufactured by Clariant.

About Isocyanate Crosslinking Agent The aqueous polyaliphatic isocyanate can be used as the crosslinking agent. This crosslinking agent is well known, and is described in, for example, Japanese Patent No. 2961475.
By using an OH group comprising dimethylol alkanoic acid and polytetramethylene ether glycol, an aqueous polyurethane resin coating having a number average molecular weight of about 18000 to 35000 is obtained as an aqueous polyurethane resin (Japanese Patent No. 349396, JP-A-8- 359844). The number average molecular weight of the polyurethane resin is usually from 12,000 to 20000, more preferably in the range of 35,000, and about 70000 aqueous polyurethane is obtained. Here, the number average molecular weight is a numerical value obtained by dissolving 1% by weight of a polyurethane resin in tetrahydrofuran, measuring it by GPC (gelation chromatography), and converting it to polystyrene. The measurement of molecular weight uses this measuring method thereafter.
The molecular weight of the polyaliphatic isocyanates and polyols involved in the reaction is adjusted according to the final polyurethane molecular weight target.
Aliphatic isocyanates such as 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,5-diisocyanato-2,2-dimethylpentane, 2,2,4- and 2,4,4- Modification of aliphatic isocyanates such as isocyanates such as trimethyl-1,6-diisocyanatohexane, 1,10-diisocyanatodecane, etc. to modify uretdione groups, isocyanurate groups, urethane groups, allophanate groups, burette groups and / or A polyisocyanate mixture can be produced by reacting with a polyalkylene oxide polyether alcohol containing an ethylene oxide unit and containing a polyisocyanate having an oxadiazine group.

These are all known substances and can be purchased and used as appropriate. Specifically, Lanxess, XL-50, LS-3486, Stahl, XR-5350, WU-5336, RH-6777, Toupe, UW Finefix HD. Can be mentioned.

The carbodiimide that is a crosslinking agent is as follows.
A polyisocyanate (a1.4) which is tetramethylxylylene diisocyanate (TMXDI) in which the carbodiimide structural unit of -N = C = -N- (I) having a molecular weight of 5 to 200 mmol / kg is 1 or more with respect to polyurethane. An aqueous dispersion introduced into polyurethane by 1) (Japanese Patent Laid-Open No. 2001-512154).
(I) Ia) Polyurethane (Ia) or Ib) Ibi) which has a carbodiimide group and has substantially no carboxyl group in addition to the hydrophilic group which causes dispersibility in water. And a physical mixture comprising a polyurethane (Ibi) substantially free of carbodiimide or carboxyl groups and Ibii) substantially free of carbodiimide (Ibii) free of hydrophilic groups causing water dispersibility And (II) a cohesive aqueous phase P.I having no carbodiimide group. A latent crosslinkable aqueous polyurethane dispersion containing a cohesive aqueous phase (P.II) containing a polycarboxylic acid dissolved in water at 25 ° C. at 25 ° C. in water. No. 2002-523538).
(1) Latent crosslinkable aqueous polyurethane dispersion containing: I) Ia) Polyurethane (Ia) having a carbodiimide group in addition to a hydrophilic group that provides water dispersibility and having substantially no carboxyl group Or Ib) Ibi) a polyurethane (Ibi) having a hydrophilic group that provides water dispersibility and substantially free of carbodiimide or carboxyl groups, and Ibii) having a hydrophilic group that substantially causes water dispersion. Disperse phase (PI) containing a physical mixture of unmodified carbodiimide (Ibii), II) other polymer (II) having carboxyl groups and substantially free of carbodiimide groups Dispersion layer (P.II) (2001-512155).

These are all known substances and can be purchased and used as appropriate. Specific examples include Lanxess, Baydem Fix UCL, Stahl, XR-5570, and XR13-906.

Silicone-based tactile agent The corn-based tactile agent is added so that the tactile sensation of the natural leather film is in a preferable state in the finished state where the top coat film is formed. Examples include hydroxypolydimethylsiloxane, aminopolydimethylsiloxane, hydroxypolydiethylsiloxane, polydimethylpolyepoxide polysiloxane, hydroxypolydiphenylsiloxane, aminopolydiethylsiloxane, dialkylsiloxane (the alkyl group is a monovalent fat having 1 to 10 carbon atoms) Group hydrocarbon, and examples thereof include a methyl group, an ethyl group, and a decyl group. The molecular weight of the reactive silicone is about 200 to 10,000, preferably 300 to 9000, more preferably 1000 to 5000.
As the silicone, a known silicone resin represented by the following general formula (IV) can be used.

R is CH ₃ or C ₆ H ₅ .
n is an integer of 10 or more and 100 or less.
A modified silicone can be used.
Modified silicone means a polydialkyl-substituted polysiloxane having a functionality of 2 to 3. The alkyl groups each have 1 to 10 carbons and the functional group may be a group such as carbinol, amino, thiol, epoxy. Hydroxypolydimethylsiloxane (eg, Dow DC1248, QA-3667, Shin-Etsu Chemical X-22-160C), aminopolydimethylsiloxane (Dow DC-536 Geneshi Polymer GP-4), polydialpolyepoxide Examples include polysiloxane.
Their molecular weight is about 200 to 10,000.

These are all known substances and can be purchased and used as appropriate. Specifically, Rosils LA2229W manufactured by Lanxess, AQUADERM addtiveSF, AQUADERM addtiveGF, Rosil2000, HM183 manufactured by Stahl, HM51760, HM2812, HM21-720, HM182-H, HM183-362H Fine touch SD, Clariant's Melio WF-5233, WF-5226conc can be mentioned.

The leveling agent and thickener are as follows. Lanxess, Leveler MA-1020, FluidH
Stahl LA-746, LA1653, RM-4442
Towpe UW Additive RO
Union Paint Co., Ltd. 74-96 Leveler-LV3

In order to confirm the effect of the present invention, a dirt test and an abrasion resistance test are performed.

The stain test method is as follows.
The evaluation of the antifouling performance by the gray scale for contamination is JIS L 0805: 2005.
(Gray scale conforming to the standard of grace scale for contamination).
The friction tester used is as shown in FIG.
1 Collect a test piece of 30 mm × 250 mm as a test piece to be tested.
2 Fix the test piece to the test table of the friction tester.
3 Collect dirt-attached cloth (jeans and contaminated cloth) having a shape of width 30 mm × length 50 mm. For jeans, 2550Y manufactured by US Test Fabric is used. This jeans, unlike the one used in the conventional test (Japanese Patent Application No. 2009-092344), has a higher degree of dirt adhesion, and has a higher antifouling performance in order to obtain the same evaluation result as the conventional test. Will be required.
43 Fix the soiled cloth prepared in step 3 to the friction element of the friction tester in the state shown in FIG.
5 Immerse the soiled cloth with friction in water. It is necessary to wipe off excess water with gauze or the like so that it does not drip.
6 Adjust the frictional element wetted with water so that it is in a horizontal position when viewed from the front of the test bench.
7. The friction element performs 100 reciprocations at a reciprocating speed of 30 times / min and a moving distance of 100 mm, applying a load of 500 g.
8 After the test with the friction element, the test piece is removed from the test stand, and the color difference between the unstained part and the soiled part is measured with a colorimeter. The state of the test piece at the time of measurement is as shown in FIG. By comparing the color differences, it can be determined whether the test piece is likely to be soiled or difficult to adhere (antifouling property).
9 Select a colorimeter that can measure Lab. The Lab color difference standard is the CIE color difference formula.
10 Regarding whether or not the attached dirt is easy to remove, in the state where the dirt is attached, half of the part is wiped with a wet cloth (you may use Kimwipe). The color difference between the two is measured with a colorimeter by the same operation as in. The state of the test piece at the time of measurement is as shown in FIG.
11 Color difference is expressed numerically. The smaller the value, the higher the antifouling property.
1.0 or less means a range in which dirt is hardly noticed visually.
0 ~ 1 5th class 1 ~ 3 4th class 3 ~ 6 3rd class 6 ~ 10 2nd class 10 or more 1st class

The methods used by general manufacturers are as follows.
It is the same in that a dirty cloth with dirt is used. In this case, dirt is attached and a dirty cloth in a dry state is used. On the other hand, in the method of the present invention, the soiled cloth is attached and a wet contaminated cloth is used. The results obtained with the present invention are sufficiently reliable as a method for measuring dirt.
The reason why the attached cloth with the dirt adhered and wet is used is based on the assumption that the dirt inside the automobile is close to this state. When dirt is attached to the inside of an automobile, it is unlikely to adhere in a dry state. The case where the dirt is likely to adhere is due to the case where it is wet with rain and the case where the person sweats in summer or the like.
About attaching dirt by a reciprocating motion, it is as follows.
It is intended to reproduce the fact that clothes, bare skin, and car seats rub against each other both when seated in a car and when getting on and off.
The reason why the denim (dye) cloth was adopted was based on the assumption that the dye adheres to the jeans when the person wearing the jeans sits down and gets on and off.

About Abrasion Resistance Abrasion resistance is a performance particularly emphasized in leather for automobile seats. The abrasion resistance was evaluated by a Weisenbeak abrasion test.
(1) Weisen beak abrasion test There are cases where dry cloth and compresses are used.
Evaluation of abrasion resistance when using a dry cloth is as follows.
One test piece having a length of 230 mm and a width of about 60 mm is taken from the vertical direction (head-butt direction) and from the horizontal direction (back-belly direction). Thereafter, the sample is fixed to a Weisenbeak abrasion tester (manufactured by Wyzenbek Tester, SCHAP SPECIALTY MACHINE, INC.), And a dry cloth cotton canvas is used as a friction element and brought into contact with the test piece.
Reciprocal wear is performed, and the wear performance is evaluated by the number of wears in a worn state in which the coating film is peeled off and the base is visible. If it is 170 times or more, it is judged that it is suitable as leather for automobile seats based on experience. Evaluation of abrasion resistance when using a compress is as follows.
After the cotton canvas used for the friction element is sufficiently immersed in water, the friction test is performed. The friction test method is the same as the dry cloth test. If it is 50 times or more, it is determined that it is suitable as leather for automobile seats based on experience.
Test with dry and compress.

Examples will be described in detail below. The present invention is not limited to this.
Reference example 1

About the formation of the base coat layer
(1) A base coat was formed on the surface of a natural leather substrate (with buffing). The procedure is the following example.
The base coat layer is a lowermost layer of the coating film layer, and is a layer for preparing unevenness on the surface of the leather and forming a layer stably on the upper surface. In forming this layer, a composition comprising a resin, a pigment, an auxiliary agent, a tactile agent, a leveling agent and water was applied to the leather surface.
The ratio of resin, pigment, and auxiliary agent to be a solid content was 60:15:25 (total 100%, weight ratio). A two-component polyurethane resin was used as the resin. The pigment of the color to be colored was used as the pigment. As the auxiliary agent, a surfactant, a thickener, a regulator, a matting agent, an anti-tacking agent and the like were used. The ratio of resin, pigment, auxiliary agent, tactile sensation agent and leveling agent, and moisture is 35:65 (total 100%. Weight ratio). As a coating method, brush coating, spraying, curtain coating, and roll coating are appropriately selected and used in a state containing an aqueous solution. The coating amount was 100 g / m ² , and water was evaporated by applying warm air to the surface after coating.
Various required wrinkles were applied by pressing (this time, it was performed on the base coat, but may be performed after the subsequent color coat or top coat).
The leather fiber is loosened and the texture is adjusted by the blanking process and the staking process (also in these processes, it may be performed after the color coat or top coat).
(2) A color coat was formed.
A color coat was formed on the base coat surface. The color coat layer is an intermediate layer of the paint curtain, and is a layer for causing pigments and dyes for coloring the leather to exist, and is provided on the base coat as viewed from the leather. In forming this layer, a composition comprising a resin, a pigment, an auxiliary agent, a crosslinking agent and water is applied to the leather surface. The ratio of the resin, the pigment, the auxiliary agent and the cross-linking agent as solid content is 60: 20: 10: 10 (total 100%, weight ratio). As the resin, a two-component polyurethane resin is used. A pigment of a color to be colored is used as the pigment. Auxiliaries include surfactants (leveling agents, etc.), thickeners, regulators, matting agents, anti-tacking agents and the like. The ratio of resin, pigment, auxiliary agent, tactile sensation, and moisture is 30:70 (total 100%. Weight ratio). As a coating method, brush coating, spraying, curtain coating, and roll coating are appropriately selected and used in a state containing an aqueous solution. The coating amount was 35 g / m ² , and water was evaporated by applying warm air to the surface after coating.

Comparative Example 1
A top coat layer was formed on the surface of the color coat layer formed as described above. The coating amount of the top coat layer was 35 g / m ² .
The component content was as follows.
Urethane resin (52 wt%, solid content), isocyanate cross-linking agent (26 wt%, solid content), silica matting agent (13 wt%, solid content), silicone tactile agent (7 wt%, solid content), leveling agent Thickener (2% by weight, solid content) (over 100% by weight in total).

Comparative Example 2
A top coat layer was formed on the surface of the color coat layer formed as described above. The coating amount of the top coat layer was 35 g / m ² .
The component content was as follows.
Acrylic polysiloxane resin (42% by weight, solids), silica matting agent (10% by weight, solids), isocyanate crosslinking agent (32% by weight, solids) and silicone-based tactile agent (13% by weight, solids), Leveling agent and thickener (3% by weight) (over 100% by weight in total).

Comparative Example 3
A top coat layer was formed on the surface of the color coat layer formed as described above. The coating amount of the top coat layer was 35 g / m ² .
The component content was as follows.
Acrylic silica resin (17 wt%, solid content), acrylic polysiloxane resin (29 wt%, solid content), urethane resin (15 wt%, solid content), and isocyanate cross-linking agent (24 wt%, solid content) and silicone System touch agent (10% by weight, solid content), leveling agent and thickener (5% by weight) (over 100% by weight in total).

A top coat layer was formed on the color coat layer formed in Reference Example 1. The coating amount was 35 g / m ² . The component content was as follows.
Acrylic silica resin (16 wt%, solid content), acrylic polysiloxane resin (28 wt%, solid content), acrylic urethane resin (11 wt%, solid content), urethane resin (7 wt%, solid content), isocyanate type Cross-linking agent (23 wt%, solid content) and silicone-based tactile agent (10 wt%, solid content) and leveling agent / thickening agent (5 wt%) (over 100 wt% in total).
The specific properties when the coating layer of claim 1 is formed as a topcoat layer on the surface of the color coat layer are shown in Example 1.
As a result, antifouling performance (after dry contamination) 4-5 grade, antifouling performance (after dry wiping) grade 4-5, antifouling performance (after wet contamination) grade 2, antifouling performance (after wet wiping) ) Was graded 3 to 4, and it was confirmed that the same or higher effects were obtained. It was dry (times) 170 when used as a top coat for wear resistance, and wet (times) 100 when used as a top coat for wear resistance.
Separately, an overcoat layer having the above-described component contents was formed on the topcoat layer formed in Comparative Example 1. The coating amount was 35 g / m ² .
It was confirmed that the effect at this time was the same as the effect in Example 1.
In any case, whether it was used as a topcoat layer or an overcoat layer, the effect of antifouling performance and abrasion resistance was confirmed. When used as an overcoat, the abrasion resistance was 300 dry or more and 250 wet. This effect was confirmed.

Similarly to Example 1, a top coat layer was formed on the color coat layer of Reference Example 1. The coating amount was 35 g / m ² .
The component content was as follows.
Acrylic silica resin (19 wt%, solid content), acrylic polysiloxane resin (32 wt%, solid content), acrylic urethane resin (13 wt%, solid content), urethane resin (8 wt%, solid content), carbodiimide type Cross-linking agent (11% by weight, solid content), silicone-based tactile agent (11% by weight, solid content) and leveling agent / thickening agent (6% by weight) (total solid content is 100% by weight).
Example 2 shows specific properties when the coating layer of claim 2 is formed as a topcoat layer on the surface of the color coat layer.
As a result, antifouling performance (after dry contamination) is grade 4-5, antifouling performance (after dry wiping) is grade 4-5, antifouling performance (after wet contamination) is grade 3, antifouling performance (after wet wiping) ) Was grade 4, and it was confirmed that the same or higher effect was obtained.
It was dry (times) 180 when used as a top coat in terms of wear resistance, and wet (times) 110 when used as a top coat in terms of wear resistance.
Separately, an overcoat layer having the above-described component contents was formed on the topcoat layer formed in Comparative Example 1. The coating amount was 35 g / m ² .
It was confirmed that the effect at this time was the same as that in the case of Example 2.
In any case, whether it was used as a topcoat layer or an overcoat layer, the effect of antifouling performance and abrasion resistance was confirmed. When used as an overcoat, the wear resistance was 300 dry or more and 300 wet or more. This effect was confirmed.

Similarly to Example 1, a top coat layer was formed on the color coat layer of Reference Example 1.
The coating amount was 35 g / m ² .
The component content was as follows.
Acrylic resin (13 wt%, solid content), acrylic silica resin (19 wt%, solid content), acrylic polysiloxane resin (28 wt%, solid content), acrylic urethane resin (12 wt%, solid content), urethane resin (7% by weight, solid content), carbodiimide crosslinking agent (9% by weight, solid content), silicone-based tactile agent (10% by weight, solid content) and leveling agent / thickening agent (2% by weight) 100% by weight in total).
Example 3 shows specific properties when the coating layer of claim 3 is formed as a topcoat layer on the surface of the color coat layer.
As a result, grade 5 for antifouling performance (after dry contamination), grade 5 for antifouling performance (after dry wiping), grades 3 to 4 for antifouling performance (after wet wiping), and antifouling performance (after wet wiping) It was confirmed that it was grade 4 to 5 and had the same or better effect.
It was dry (times) 170 when used as a top coat for wear resistance, and wet (times) 100 when used as a top coat for wear resistance. Separately, an overcoat layer having the above-described component contents was formed on the topcoat layer formed in Comparative Example 1. The coating amount was 35 g / m ² .
It was confirmed that the effect at this time was the same as that in the case of Example 3.
In any case, whether it was used as a topcoat layer or an overcoat layer, the effect of antifouling performance and abrasion resistance was confirmed. When it was used as an overcoat, the abrasion resistance was 280 (dry) or more and 300 (wet) or more. This effect was confirmed.

Similarly to Example 1, a top coat layer was formed on the color coat of Reference Example 1.
The coating amount was 35 g / m ² .
The component content was as follows.
Acrylic resin (12 wt%, solid content), acrylic silica resin (17 wt%, solid content), acrylic polysiloxane resin (24 wt%, solid content), acrylic urethane resin (10 wt%, solid content), urethane resin (6% by weight, solid content), carbodiimide crosslinking agent (8% by weight, solid content), silicone-based tactile agent (21% by weight, solid content) and leveling agent / thickening agent (2% by weight) 100% by weight in total).
Example 4 shows specific properties when the coating layer of claim 3 is formed as a topcoat layer on the surface of the color coat layer.
As a result, antifouling performance (after dry contamination) is grade 4-5, antifouling performance (after dry wiping) is grade 5, antifouling performance (after wet contamination) is grade 3-4, antifouling performance (after wet wiping) ) Was grade 4, and it was confirmed that the same or higher effect was obtained.
It was dry (times) 180 when used as a top coat in terms of wear resistance, and wet (times) 110 when used as a top coat in terms of wear resistance.
Separately, an overcoat layer having the above-described component contents was formed on the topcoat layer formed in Comparative Example 1. The coating amount was 35 g / m ² .
It was confirmed that the effect at this time was the same as that in the case of Example 3.
In any case, whether it was used as a topcoat layer or an overcoat layer, the effect of antifouling performance and abrasion resistance was confirmed. When used as an overcoat, the wear resistance was 300 dry or more and 300 wet or more. This effect was confirmed.

The leather with the coating layers obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was tested for antifouling performance. The results are shown in Table 2.
It was confirmed that Examples 1 to 4 were all better than Comparative Examples 1 to 3. The antifouling performance was the same when each coating layer was formed as a topcoat layer and when it was formed as an overcoat layer.

The leathers coated with the coating layers obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were tested for wear resistance by Weisenbeak. The results are shown in Table 2.
Regarding the abrasion resistance performance of the leather coated with the coating layers obtained in Examples 1 to 4, when each coating layer was used as an overcoat layer, both were better than when used as a topcoat layer. It was confirmed that.

The component compositions of Examples 1 to 4 and Comparative Examples 1 to 3 are shown in Table 1.

Table 2 shows the test results.

INDUSTRIAL APPLICABILITY The present invention is capable of imparting antifouling property to other acrylic resins and can be used as antifouling property imparting leather.

Claims

Acrylic silica resin (13 to 19% by weight, solid content), acrylic polysiloxane resin (25 to 31% by weight, solid content), acrylic urethane resin (9 to 13% by weight, solid content), urethane resin (5 to 9% by weight) %, Solid content), isocyanate-based crosslinking agent (20-26% by weight, solid content) and silicone-based tactile agent (8-12% by weight, solid content) and leveling agent / thickening agent (3-8% by weight) ( An antifouling leather coating layer comprising a total solid content of 100% by weight).
Acrylic silica resin (13-22 wt%, solid content), acrylic polysiloxane resin (25-35 wt%, solid content), acrylic urethane resin (9-15 wt%, solid content), urethane resin (6-10 wt%) %, Solid content), carbodiimide crosslinking agent (6-15 wt%, solid content), silicone tactile agent (9-13 wt%, solid content) and leveling agent / thickening agent (3-8 wt%) ( An antifouling leather coating layer comprising a total solid content of 100% by weight).
Acrylic resin (10 to 16% by weight, solids), acrylic silica resin (13 to 22% by weight, solids), acrylic polysiloxane resin (25 to 35% by weight, solids), acrylic urethane resin (6 to 15% by weight) %, Solid content), urethane resin (4 to 10% by weight, solid content), carbodiimide crosslinking agent (5 to 15% by weight, solid content), silicone tactile agent (8 to 24% by weight, solid content) and leveling An antifouling leather coating layer comprising an agent / thickening agent (1 to 5% by weight) (total solid content is 100% by weight).
A natural leather, wherein the antifouling leather coating layer according to claim 1 is formed as a topcoat layer on the surface of the color coat layer.
A natural leather, wherein the antifouling leather coating layer according to claim 2 is formed as a topcoat layer on the surface of the color coat layer.
A natural leather, wherein the antifouling leather coating layer according to claim 3 is formed as a topcoat layer on the surface of the color coat layer.
A natural leather, wherein the antifouling leather coating layer according to claim 1 is formed as an overcoat layer on the surface of the topcoat layer.
A natural leather, wherein the antifouling leather coating layer according to claim 2 is formed as an overcoat layer on the surface of the topcoat layer.
A natural leather, wherein the antifouling-imparting leather coating layer according to claim 3 is formed as an overcoat layer on the surface of the topcoat layer.