JP2597439B2 - Organic coating compositions and painted products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic coating composition which contains a resin as a coating film forming element and is suitable for use as a metal material for forming a coating film having excellent adhesion and rust prevention. , Containing resin as a film-forming element,
The present invention relates to a coated product having a coating film excellent in adhesion and rust prevention on a metal material surface .

[0002]

2. Description of the Related Art Metal materials such as steel materials and aluminum alloy materials are used for various purposes such as building materials, structures such as automobiles, aircrafts and vehicles, and electric products. The metal material is coated with an organic coating composition. Organic coating compositions have many advantages in that the coatings are tough, moderately flexible, and inexpensive, and therefore are often used for coating metal materials.

[0003] Before applying an organic coating composition to a metal material, a chemical conversion treatment with degreasing, phosphoric acid or the like is generally performed. Degreasing is performed to clean the metal surface and remove contaminants, and chemical conversion treatment is performed to enhance the adhesion of the coating composition to the metal surface and the corrosion resistance of the metal.

[0004]

Since metal materials such as steel plates are easily rusted and corrode easily, they are coated with a rust preventive in advance, but still have insufficient rust prevention. In addition, at the time of coating, the rust inhibitor is removed by degreasing, so that it is necessary to perform a chemical conversion treatment after degreasing. Even if a rust inhibitor is coated, the coating film has good adhesion and an organic coating composition that enhances rust prevention properties. Increase. However, such coating compositions have not been found before.

Accordingly, the present invention provides an organic coating composition suitable for use as a metal material, which forms a coating film having excellent adhesion and rust resistance on the surface of the metal material without performing degreasing or chemical conversion treatment. As a first subject. Further, the present invention is applicable to a metal material used to form a coating film having excellent adhesion, rust resistance and water resistance on the metal material surface without performing degreasing or chemical conversion treatment.
Second, to provide a suitable organic coating composition.
Subject. Still another object of the present invention is to provide a coated product having a coating film formed on the surface of a metal material without performing degreasing or chemical conversion treatment and having excellent adhesion and rust prevention.

[0006]

Means for Solving the Problems In order to solve the above first problem, the organic coating composition of the present invention is suitable for use in metal materials containing a resin as a film forming element.
The organic coating composition contains a biological calcium compound (hereinafter, referred to as "raw Ca-compound") having a particle size of 400 mesh or less for improving adhesion and rust prevention of the coating film. It is characterized by the following.

In order to solve the second problem, an organic coating composition according to the present invention, which contains a resin as a film-forming element, has a particle size of 400 mesh or less.
Raw Ca- compounds and it contains a coupling agent having, or 4 which is surface treated with a coupling agent
It contains a raw Ca-compound having a particle size of 00 mesh or less . The organic coating composition of the present invention has a surface treatment with a coupling agent of 400 mesh or less.
When it contains a raw Ca-compound having a particle size , it may further contain a coupling agent. The third section above
In order to solve the problem, the painted product of the present invention includes a metal material,
An organic coating film formed on the metal material surface;
Having the organic coating film, a film forming element
Resin to improve the adhesion and rust prevention of the coating film
Contains raw Ca-compounds.

The coating composition of the present invention can form a film having excellent adhesion to a metal material and excellent rust resistance to the metal material without subjecting the metal material to be coated to degreasing or chemical conversion treatment. . Further, when another paint is applied on the film to form a film, the adhesion to the film thereon is good. Therefore, the coating composition of the present invention comprises
Used as a primer, paint, etc.

The resin used as a coating film forming element in the present invention includes, for example, an isocyanate compound having two or more isocyanate groups in a molecule (hereinafter, simply referred to as “isocyanate compound”), an epoxy resin, an acrylic resin, Resins such as an epoxy resin modified with a brittleness modifier such as polyester resin and rubber; and those containing a thermoplastic elastic polymer such as rubber, thermoplastic elastomer, and vinyl acetate resin. As the coating film forming element, an appropriate resin may be used depending on the use of the coating composition and the like. For example, only one of the above-mentioned resins and thermoplastic elastic polymers is used, or two or more are used in combination. Examples of the combination when used in combination include a modified resin of an epoxy resin and a reactive elastomer, and a polymer blend of an isocyanate compound and a polyester resin. When two or more compounds of the resin and the thermoplastic elastic polymer are used in combination, the ratio is appropriately set depending on the combination of the resins and the like, and is not particularly limited.

The isocyanate compound used in the present invention includes, for example, urethane prepolymer. The urethane prepolymer preferably has, for example, an amine equivalent of 450 to 1500, and has an amine equivalent of 5 to 5.
Those having a number of from 00 to 800 are more preferable. Urethane prepolymers having these amine equivalents are, for example, 100
It has a number average molecular weight of 0-4000. If the amine equivalent (or the number average molecular weight) is below the above range, the molecular weight is small and the toughness after crosslinking may be lacking. The isocyanate compound used in the present invention is not particularly limited as long as it has two or more isocyanate groups. Examples of the urethane prepolymer include isocyanate derivatives such as tolylene diisocyanate urethane prepolymer, methylene diphenyl diisocyanate urethane prepolymer, hexamethylene diisocyanate urethane prepolymer, xylylene diisocyanate urethane prepolymer, and isophorone diisocyanate urethane prepolymer. Listed, each used alone,
Or two or more are used together.

The isocyanate compound is cured by moisture in the atmosphere such as air, or cured by a curing agent to form a three-dimensional crosslinked structure. As the curing agent, for example, a compound having one or more active hydrogens (sometimes referred to as an active hydrogen compound) is used. Specific examples of such compounds include, for example,
Examples thereof include aromatic polyamines, aliphatic polyamines, polyols, polycarboxylic acids, polyamides, and phenols, and any one of them is used alone, or two or more are used in combination. When using a curing agent, the ratio is not particularly limited, but is calculated and added as a stoichiometric ratio of the isocyanate compound and the active hydrogen compound, it is theoretically preferable to add an ideal amount to the system .

The epoxy resin is not particularly limited as long as it is a compound having two or more epoxy groups in a molecule. Examples thereof include bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolak type epoxy resin, These modified resins and the like can be mentioned, and each is used alone or in combination of two or more. The epoxy resin has an epoxy equivalent of 180 to 70.
The thing of 0 is preferable and the thing of 180-200 of epoxy equivalent is more preferable. If the epoxy equivalent is less than the above range, the molecular weight may be low and brittleness may be exhibited. If the epoxy equivalent is more than the above range, the molecular weight may increase and solidification may occur, resulting in poor handling.

When an epoxy resin is used as a coating film forming element, an appropriate curing agent, curing accelerator and the like are used as necessary. Examples of the curing agent include dicyandiamide, hydrazide, imidazole, aromatic polyamine, aliphatic polyamine, thiol, and polymercaptan. Examples of the curing accelerator include tertiary amine, carboxylic acid, phenol, and tertiary amino acid. An addition product of a compound having a group and an epoxy resin is used. The amount of the hardener is calculated, for example, based on the stoichiometric ratio of the epoxy group to the active hydrogen compound, and the amount to be added is determined. The curing accelerator is, for example, 1 to 10% by weight (based on the total weight of the epoxy resin).
And the ratio of Further, for example, a liquid rubber such as a reactive elastomer, a modified epoxy resin modified with them, or the like can be added as a brittleness modifier of the epoxy resin. For example, acrylic modification, CTBN modification, SB
The modified epoxy resin such as R-modified or urethane-modified is added at a ratio of 5 to 100 parts with respect to 100 parts by weight of the epoxy resin (unmodified product) (hereinafter, "parts by weight" is simply referred to as "parts"). .

The acrylic resin used in the present invention is, for example, mainly ethyl acrylate, methyl methacrylate,
Acrylic polymers composed of starting monomers such as styrene acrylate, and in some cases, those starting monomers, and a polymer obtained by copolymerizing a monomer having a functional group such as a glycidyl group, a methylolamide group, or an amino group, It is composed of a combination of a curing agent (or a crosslinking agent) and a catalyst.

The thermoplastic elastic polymer used in the present invention includes, for example, chloroprene rubber, SBR (styrene-butadiene binary random copolymer), SBS (styrene-butadiene-styrene block copolymer), SBR
IS (styrene-isoprene-styrene block copolymer), EVA (ethylene-vinyl acetate copolymer), α
-There is no particular limitation as long as it is a thermoplastic elastomer such as an olefin.

The raw Ca-compound is a biologically-derived compound, for example, a compound formed by calcification among compounds containing calcium. Specific examples of the raw Ca-compound include, for example, shells (eg, scallop, clams, clams, clams), egg shells, hydroxyapatite (hereinafter, referred to as “HAp”), limestone (limestone), and the like. Only one of these can be used alone, or two or more can be used in combination. These are appropriately washed, crushed, for example, grain size 400 mesh (Taira
-Standard sieve) or powder having an average particle diameter of 10 µm or less. When the particle size exceeds the range , there is a possibility that the adhesive performance may be reduced. However, in the present invention, light calcium carbonate, white luster (ultrafine calcium carbonate (high purity product of light calcium carbonate)), calcium compound reagent, etc., which are made by performing chemical synthesis, are made of raw Ca-
Not included in compounds. Also, HAp obtained by chemical synthesis is not a raw Ca-compound, and the effect of the present invention is not achieved.

HAp is represented, for example, by a typical structural formula of M ₁₀ (ZO ₄ ) ₆ (OH) ₂ [where M
Is an inorganic filler represented by Ca, Pb; Z is As, P, V], and is generally Ca ₁₀ (PO ₄ ) ₆ (OH) ₂
It is. HAp used in the present invention is usually 0.1 to 0.1.
Although it contains impurities of about 5 ppm, there is no problem in performance. The coating composition of the present invention comprises the raw C
a-compound is surface-treated with a coupling agent (hereinafter, a coupling agent for surface-treating raw Ca-compound is referred to as “coupling agent A”) and / or a coupling agent as a compounding component (Hereafter, Cotin
The coupling agent used as a compounding component of the rubber composition is referred to as “coupling agent B”), since the water resistance of the formed film is improved.

For surface treatment of the raw Ca-compound with the coupling agent A, for example, a coupling agent (ie,
In the present invention, aluminum and silane are dissolved in a solvent such as water or an organic solvent, and raw Ca-
A method of adding the compound, dispersing and stirring in a slurry state, treating for 2 to 3 days, removing the supernatant, drying the residual solvent, and controlling the particle size before the treatment is adopted. It is not limited to this.

Examples of the coupling agents A and B include silane coupling agents such as vinyl silane, epoxy silane, methacryl silane, amino silane, and mercapto silane; and aluminum coupling agents such as aluminum alcoholate and aluminum chelate. Each used alone or
Two or more are used together.

The amount of the raw Ca compound which has been surface-treated with the coupling agent or has not been subjected to the surface treatment is not particularly limited. Preferably, the ratio is 8 parts. If the ratio is out of this range, the effect of adding the raw Ca-compound may not be exhibited. The addition amount of the coupling agent B is not particularly limited, but is preferably, for example, 1 to 10 parts with respect to 100 parts of the resin. If the ratio is out of this range, sufficient adhesiveness, adhesive strength, water-resistant adhesiveness, water-resistant adhesive strength, or the like may not be obtained, or foaming may occur.

Further, various reactive elastomers and the like are added to the coating composition of the present invention, if necessary, for improving adhesion. These blending amounts are, for example, 5 to 100 parts with respect to 100 parts of the resin. When the isocyanate compound and the epoxy resin are used in combination as the coating film forming element in order to improve the adhesion, the compounding amount of the isocyanate compound and the epoxy resin is, for example, 5 to 25 parts of the epoxy resin with respect to 100 parts of the isocyanate compound. Is done.

The coating composition of the present invention comprises an organic coloring pigment such as a nitroso pigment, an azo pigment or a phthalocyanine pigment; titanium white, carbon black, red iron, ultramarine,
It is possible to include an inorganic coloring pigment such as zinc white. The addition amount of the coloring pigment is appropriately set according to the color of the coating film, and is, for example, a ratio of 0 to 300 parts with respect to 100 parts of the resin.

The coating composition of the present invention is prepared by dissolving it in a suitable solvent (the raw Ca-compound does not dissolve) or dispersing it in a suitable dispersion medium. As the solvent used, for example, alcohol solvents,
Ketone solvents, ester solvents, aromatic hydrocarbon solvents, and the like. The amount of solvent is, for example, from 20 to 600% by weight, based on the total weight of the coating composition.
If the ratio is out of this range, there is a possibility of uneven coating, cracking, blistering or peeling of the coating film.

The coating composition of the present invention may contain, if necessary, other components in addition to the above components, such as an antioxidant, an ultraviolet absorber, a fungicide, a leveling agent, a dispersant, a plasticizer, and an emulsifier. One or more components such as a matting agent, which are added to a conventional coating composition, are added. In order to prepare the coating composition of the present invention, for example, a method of adding a raw Ca-compound and a pigment to a resin component dissolved in a solvent (solvent) and dispersing the same with a high-speed stirrer or the like is adopted.

The coating composition of the present invention is applied to an object to be coated as it is or after being appropriately diluted with the above-mentioned solvent. As a coating method, for example, a brush coating, a spatula coating, a roll coater, a flow coater, a dipping coating, a spray gun, a calendar coater, a spray coater and the like can be used in the same manner. Drying and baking for forming a film can be performed in the same manner as a conventional coating material. After application, the coating film can be formed without drying, or after drying and further baking, and then applying another coating composition (or paint).

As another coating composition to be applied thereon, for example, a top coating agent (top coating agent) and the like can be mentioned. The film formed by the coating composition of the present invention preferably has a thickness of, for example, 3 to 150 μm in consideration of adhesion and rust prevention. The coating composition of the present invention has no particular limitation on the object to be applied, but exhibits an excellent effect when applied to a metal material as compared with a conventional paint. That is, a rust is hardly generated on the painted surface of the metal material, and a film that is hardly peeled off from the metal material is formed.
There are no particular restrictions on the type of metal material, for example, steel,
An aluminum alloy material, a stainless steel material, a zinc material and the like can be mentioned. It is not necessary to apply a pretreatment such as degreasing or chemical conversion treatment to the object to be applied.

[0027]

When the raw Ca-compound is added to the coating composition, the raw Ca-compound interacts with the oxide film on the metal surface. It is thought to cause an interaction. When the raw Ca-compound is surface-treated with a coupling agent, the water resistance of the formed coating film is improved.

When a coupling agent is added as a component of the coating composition, the adhesion and water resistance of the formed coating film are further improved. From the viewpoint of further improving the water resistance, the coating composition preferably contains a raw Ca-compound surface-treated with a coupling agent and also contains a coupling agent as a compounding component.

[0029]

EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. -Preparation Example 1 (Preparation of raw Ca-compound)-The scallop shell was immersed in methanol for 24 hours, further immersed in tap water for 24 hours, and washed sufficiently for 10 hours in a non-circulating heater-type thermostat. The water from which water had been removed for more than an hour was pulverized with a ball mill and sieved to obtain scallop shell powder (hereinafter sometimes simply referred to as "scallop") passing through 400 mesh (Tyler standard sieve; the same applies hereinafter).

Preparation Example 2 (Preparation of raw Ca compound) KBM-403 (glycidoxypropyltrimethoxysilane manufactured by Shin-Etsu Chemical Co., Ltd.) which is a silane coupling agent
Was weighed, and 97 g of water was added thereto to prepare a 3 wt% silane coupling agent aqueous solution. There, HAp
(Product name "hydroxyapatite BC" manufactured by Nitta Gelatin Co., Ltd., average particle size 10 μm or less, particle size distribution 4 to 12
(particles in the range of μm) (the quantitative ratio of the silane coupling agent to the HAp powder was 100 parts of the aqueous solution of the silane coupling agent and 50 parts of the raw Ca-compound powder) to form a slurry. The supernatant was removed, and the remaining moisture was removed by heating and drying in a thermostat. Dry H
Ap is finely pulverized, and the particle diameter is determined before treatment (average particle diameter 1).
0 μm or less, particles having a particle size distribution of 4 to 12 μm). The HAp powder surface-treated with the silane coupling agent in this manner is referred to as a silane-treated HAp powder.

Preparation Example 3 (Preparation of Raw Ca Compound) Preparation Example 2 except that the scallop shell powder obtained in Preparation Example 1 was used instead of the HAp powder in Preparation Example 2.
A scallop shell powder surface-treated with a silane coupling agent was obtained in the same manner as described above. This is called scallop shell powder after silane treatment.

Preparation Example 4 (Preparation of Raw Ca Compound) Surface preparation with a silane coupling agent in the same manner as in Preparation Example 2 except that egg shell powder was used instead of HAp powder. The obtained egg shell powder was obtained. This is referred to as egg shell powder after silane treatment. -Preparation Example 5 (Preparation of raw Ca-compound)-In Preparation Example 2, instead of the silane coupling agent, an aluminum-based coupling agent [aluminum chelate ALCH (trade name, manufactured by Kawaken Fine Chemical Co., Ltd. (compound name: ethyl acetoacetate)] HAp powder surface-treated with a coupling agent was obtained in the same manner as in Preparation Example 2, except that aluminum diisopropylate)) was used, and acetone was used instead of water as a solvent.
This is called HAp powder after Al-based coupling agent treatment.

Example 1 As an epoxy resin, a bisphenol type epoxy resin manufactured by Dainippon Ink and Chemicals, Inc .: epoxy equivalent 19
0) was used. As a curing agent for the epoxy resin, Araldite hardener (liquid aromatic diamine type) manufactured by Ciba-Geigy Corporation was used.

In addition, the silane coupling agent used in Preparation Example 2, titanium oxide (JR-60 manufactured by Teikoku Kako Co., Ltd.)
2) and thinner [xylene: IPA (isopropyl alcohol): butyl alcohol: MEK (methyl ethyl ketone): butyl cellosolve = 5: 2: 1: 1: 1
(Weight ratio) of the mixed solvent]. First, an epoxy resin, a pigment titanium oxide, and a silane-treated HAp powder are kneaded five times with a three-roll mill, and the kneaded product is mixed with the above-described coupling agent and thinner with stirring, and further mixed with a curing agent to form an organic material. A coating composition was obtained.

-Examples 2 to 11- An organic coating composition was obtained in the same manner as in Example 1 with the formulations shown in Tables 1 and 2. Comparative Example 1 A comparative coating composition was obtained in the same manner as in Example 1, except that the raw Ca-compound and the coupling agent were not used.

Comparative Example 2 A comparative coating composition was obtained in the same manner as in Example 1 except that the raw Ca-compound was not used. -Comparative Example 3-A comparative coating composition was prepared in the same manner as in Example 1 except that a synthetic lead HAp was used instead of the raw Ca-compound, and that no coupling agent was used. I got something.

Further, among the coupling agents in Tables 1 and 2, the silane coupling agent is the same silane coupling agent used in Preparation Example 2, and the Al-based coupling agent is The same aluminum-based coupling agent as used. An aluminum alloy plate (A3003P of Japanese Industrial Standard H4000) not subjected to degreasing and chemical conversion treatment of the coating composition obtained as described above.
Was applied with a roll coater, dried at 80 ° C. for 10 minutes, and then cured at 150 ° C. for 1 hour to a thickness of 35 μm.
Was formed. The obtained coated plate was examined for adhesion, rust prevention and water resistance of the coating film, and the results are shown in Tables 1 and 2. Cross-cut the painted plate with 1mm intervals with an adhesive cutter knife to make 100 square 1mm squares, strongly adhere the adhesive tape to these 100 squares, peel off quickly, and check the number of remaining squares. Evaluation was made according to the following criteria.

Xxx: 80-100 remaining square shapes. ○: The remaining square shape is 70 to 79 pieces. …: The remaining square shape is 60 to 69 pieces. ×: The remaining square shape is 59 or less. The rust-preventive coated plate was exposed to warm water at 40 ° C. for 30 days, the coating film was peeled off, and the state of rust on the object to be coated on the surface was visually observed and examined, and evaluated according to the following criteria.

Xxx: No rust is observed. XX: Some rust is generated. …: Rust is generated on about 1/3 of the painted surface. ×: Rust is generated on almost all of the painted surface. Water resistance The water resistance was determined by exposing the test piece to warm water at 40 ° C. for 30 days and examining the initial and after 30 days of the adhesion retention rate. Less than 80%…: Retention rate of 60% or more, less than 70% ×: Retention rate of less than 60%.

[0040]

[Table 1]

[0041]

[Table 2]

Example 12 As an acrylic resin, UPICACOAT AC3006 (trade name, manufactured by Mitsubishi Gas Chemical Company, Inc.) (acid value: 64.7 mgKOH /
g) was used. As a crosslinking agent, the company's brand name "TETR
AD-X "(a room temperature curing or low temperature baking type crosslinking agent of an acrylic resin) was used. The same titanium oxide, thinner, and coupling agent as those used in Examples 1 to 11 were used. Using these components at the ratios shown in Table 3, an organic coating composition was obtained in the same manner as in Example 1.

Examples 13 and 14 and Comparative Examples 4 and 5 An organic coating composition was obtained in the same manner as in Example 12 with the composition shown in Table 3. Examples 12 to 14 and Comparative Examples 4 and 5
The coating composition was examined for adhesion, rust resistance and water resistance in the same manner as in Example 1 except that the drying and curing conditions were changed. Drying and curing were performed at 80 ° C. for 20 minutes. The results are shown in Table 3.

[0044]

[Table 3]

Example 15 As a urethane resin, Desmocup 11 (trade name, manufactured by Sumitomo Bayer Urethane Co., Ltd.) (blocked polyisocyanate compound: TDI-based branched blocked isocyanate, nonvolatile content 100%, isocyanate group content 2.4)
%). The same curing agent, titanium oxide, thinner, and coupling agent as those used in Examples 1 to 11 were used. A urethane resin, a curing agent, titanium oxide, and HAp were kneaded in the proportions shown in Table 4 in the same manner as in Example 1, and the kneaded product was stirred and mixed with a coupling agent and a thinner to obtain an organic coating composition.

[0046]

Effects of the Invention Organic-based coating composition of the present invention, suitable for resin as film formers including, a metal material applications
The organic coating 1 composition contains a raw Ca-compound having a particle size of 400 mesh or less in order to improve the adhesion and rust prevention of the coating film, so that it is applied to metal materials without performing degreasing and chemical conversion treatment. Even if it does, it forms a coating film excellent in adhesion and rust prevention. When the coating composition contains a coupling agent and / or a raw Ca-compound surface-treated with the coupling agent, a coating film having excellent water resistance in addition to their performance is formed. You. The coated product of the present invention has a metal material and an organic coating film formed on the surface of the metal material, and the organic coating film uses a resin as a film-forming element and adherence of the coating film. In addition, since a raw-Ca compound is included for improving rust prevention, the coating is excellent in adhesion and rust prevention even if a coating is formed on the metal material without performing degreasing or chemical conversion treatment.

[0047]

[Table 4]

As shown in Tables 1 to 4, the coating compositions of the examples formed films having excellent adhesion and rust prevention. Among them, those containing a coupling agent and / or a raw Ca-compound surface-treated with the coupling agent were particularly excellent in water resistance. In contrast, all of the coating compositions of Comparative Examples containing no raw Ca-compound were inferior.

[0049]

The organic coating composition of the present invention
Contains resin as a coating film forming element,
Has a particle size of 400 mesh or less to improve rust resistance
Since including that raw Ca- compounds, excellent coating film form <br/> forming the adhesion and corrosion resistance even when coated without degreasing and chemical conversion treatment. When the coating composition contains a coupling agent and / or a raw Ca-compound surface-treated with the coupling agent, a coating film having excellent water resistance in addition to their performance is formed. You. Painting of the invention
The product comprises a metal material and an organic core formed on the surface of the metal material.
A coating film, and the organic coating film
Uses resin as a coating film forming element,
Since it contains biological calcium compounds to improve rustability,
The coating is formed on the metal without degreasing or chemical conversion.
However, the coating film is excellent in adhesion and rust prevention.

Claims (5)

(57) [Claims] 1. An organic coating composition containing a resin as a coating film forming element and suitable for a metal material, having a particle size of 400 mesh or less for improving adhesion and rust prevention of the coating film. An organic coating composition comprising a biological calcium compound. 2. A coating material comprising: a metal material; and an organic coating film formed on the surface of the metal material. Painted products containing biological calcium compounds to improve rust resistance. 3. The organic coating composition according to claim 1, wherein the biological calcium compound is at least one selected from the group consisting of hydroxyapatite, shells and egg shells. Painted goods. 4. in which biological systems calcium compound is surface treated with a coupling agent, according to claim 1 or 3
The organic coating composition according to claim 2, or the coated product according to claim 2 or 3. 5. The organic coating composition according to claim 1, 3, or 4, which comprises a coupling agent, or the coated article according to any one of claims 2 to 4.