JP2000144022A - Matte anionic electrodeposition coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an anionic electrodeposition coating composition which forms a film excellent in finished appearance and performance. SOLUTION: This coating composition contains the following curable resin components: (A) 29.9-84 wt.% water-dispersible resin having alkoxysilyl groups on the side chain, with an acid value of 15-80 KOHmg/g, a hydroxyl number of 30-200 KOHmg/g and a solubility parameter of 9.0 to 11.6; (B) 0.1-20 wt.% resin having an acid value of 0-200 KOHmg/g, a hydroxyl number of 30-200 KOHmg/g and a solubility parameter of 9.1 to 13.1, with the solubility parameter being greater than that of the resin A by 0.1-1.5; and (C) 15-50 wt.% crosslinking agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anionic electrodeposition coating composition capable of forming a matte coating film having excellent finished appearance and various performances.

[0002]

2. Description of the Related Art Conventionally, anodized aluminum materials are often used in building materials such as sashes because of their light weight, high strength, and excellent corrosion resistance. In addition, the aluminum material is coated with a matte electrodeposition coating in order to impart properties such as mortar resistance and stain resistance, and to create a calm atmosphere.

[0003] As an electrodeposition coating composition for forming a matte coating film, one described in JP-A-2-255871 is known. The coating composition comprises a water-dispersible vinyl copolymer having an alkoxysilyl group in a side chain and a melamine resin which is not completely compatible with the copolymer.

[0004] As a method of forming an electrodeposition coating film on an aluminum profile used for building materials such as sashes, usually, a plurality of molded aluminum profiles are suspended by a fixture such as a jig. Then, while transporting this product, degreasing, washing and etching (caustic soda aqueous solution, etc.)
Treatment, water washing treatment, neutralization treatment, anodizing treatment (sulfuric acid bath),
It is carried out by a water washing treatment, an electrolytic coloring film treatment and a water washing treatment as required, a sealing treatment (hot water washing), an electrodeposition coating, and a water washing treatment and baking as required.

In the above method, an etching solution (alkali material) or an anodizing solution (acid material) attached to a jig is applied to the surface of an aluminum material before electrodeposition coating or the surface of a coating film after electrodeposition coating. There is a problem in that it hangs down and adheres, which adversely affects the electrodeposition coating film.

As an electrodeposition paint which solves the above-mentioned problems, the present applicant disclosed in Japanese Patent Application Laid-Open No. Hei 10-46065 a matte using a resin having a lower solubility parameter than a water-dispersible alkoxysilyl group-containing resin. An anionic electrodeposition coating was proposed. However, in the above-mentioned matte anion type electrodeposition coating, the die formed when extruding the molten aluminum through a die into an adapted aluminum material such as a building material appears on the surface of the electrodeposited coating film. The problem that the finished appearance was inferior remained.

[0007] In addition, in the treatment of the electrolytic colored film, there is still a problem that unevenness in the treatment due to the coloring agent (adhering liquid) is easily picked up and the finished appearance of the coated film is inferior.

[0008]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, use a water-dispersible resin having a larger solubility parameter than a matting base resin. As a result, it has been found that a matte coating film excellent in matte finish appearance can be provided, and the present invention has been completed.

That is, the present invention relates to the following component (A): water having an acid value of 15 to 80 KOH mg / g and a hydroxyl value of 30 to 200 KOH mg / g and having a solubility parameter of 9.0 to 11.6 having an alkoxysilyl group in a side chain. Dispersible resin 29.9 to 84% by weight (B) A resin having an acid value of 0 to 200 KOH mg / g, a hydroxyl value of 30 to 200 KOH mg / g, and a solubility parameter of 9.1 to 13.1, and used. Resin having a solubility parameter value of (B) 0.1 to 1.5 greater than the solubility parameter value of resin (A) used 0.1 to 20% by weight (C) Crosslinking agent 15 to 50% by weight , As a curable resin component.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The water-dispersible resin (A) used in the coating composition of the present invention has an acid value of 15 to 80 KOH mg / g, preferably 20 to 70 KOH mg / g, and a hydroxyl value of 30 to 2 KOH.
00KOHmg / g, preferably 40-150KOHm
It is a copolymer having a g / g alkoxysilyl group in the side chain. The weight average molecular weight of this product is about 10,000 to 20
A range of 10,000 is preferred. When the acid value is less than 15 KOHmg / g, the water dispersibility is reduced. On the other hand, when the acid value is more than 80 KOHmg / g, the compatibility with the resin (B) is improved. The finished appearance of the coating film deteriorates. Hydroxyl value is 30KOH
When the amount is less than mg / g, the curability is reduced.
Exceeding OH mg / g is undesirable because a large amount of unreacted hydroxyl groups remain in the coating film, resulting in poor durability and the like.

The water-dispersible resin (A) comprises an alkoxysilyl group-containing unsaturated monomer, a hydroxyl group-containing unsaturated monomer and a carboxyl group-containing unsaturated monomer as essential monomer components, and optionally contains other unsaturated monomers. Those copolymerized with-are preferably used.

The following are examples of these monomer components.

(1) Unsaturated monomers containing an alkoxysilyl group: for example, γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropylmethyldimethoxysilane, γ- (meth) acryloxypropyltrimethoxysilane Ethoxysilane, vinyltrimethoxysilane, etc. (2) Hydroxyl-containing unsaturated monomer: for example, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and, in addition, Plaxel FM1
(Manufactured by Daicel Chemical Industries, trade name, caprolactone-modified (meth) acrylic acid hydroxyesters), Praxel F
Hydroxyl group-containing unsaturated monomers such as M2 (same as left), plaxel FM3 (same as left), plaxel FA1 (same as left), plaxel FA2 (same as left), plaxel FA3 (same as left), etc. (3) carboxyl group-containing unsaturated monomer: for example ,
(4) Other unsaturated monomers: for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, (meth) acrylic acid, maleic acid, etc. C1-18 of (meth) acrylic acid such as hexyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, and cyclohexyl (meth) acrylate
Alkyl or cycloalkyl esters, aromatic vinyl monomers such as styrene, (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N-
(Meth) acrylamide such as methylol (meth) acrylamide and derivatives thereof, (meth) acrylonitrile compounds, etc. The mixing ratio of these monomers is 0.1% in terms of the total amount of unsaturated monomers containing an alkoxysilyl group. 20 to 20% by weight, preferably 0.5 to 10% by weight, 3 to 40% by weight of the hydroxyl-containing unsaturated monomer, preferably 5 to 30% by weight, 2 to 30% by weight of the carboxyl-containing unsaturated monomer, Preferably 4 to 10% by weight, and if necessary, 0 to 94.9% by weight, preferably 5 to 9% by weight of another unsaturated monomer.
It is in the range of 0 to 90.5% by weight.

The solubility parameter (SP value) of the water-dispersible resin (A) is 9.0-11.6, especially 9.1-1.0.
A range of 9.7 is preferred.

In the specification of the present invention, the solubility parameter
What is a tar (solubility parameter)
Is a measure of the intermolecular interaction of liquid molecules.
When the SP value of the monomer raw material is known, the SP of the monomer raw material is calculated using the following equation.
The SP value was determined, and this SP value was used as the SP value of the copolymer. When the SP value of the monomer material is unknown, the resin whose SP value is to be determined is dispersed and dissolved using a variety of organic solvents having a known SP value so that the solid content is 1% by weight. The SP value of the organic solvent when an organic solvent resin liquid that is not separated is obtained, and, when two or more organic solvents are present, the average value of the SP values of those organic solvents is referred to as the SP value of the copolymer. did.

The SP value of the monomer raw material is described in J. paint
technology, vol. 42, 176 (19
70). The SP value of the monomer mixture is calculated using the following equation.

SP = SP1 × fw1 + SP2 × fw2 +... SPn × fwn In the above equation, SP1, SP2,..., SPn are SP values of each monomer, fw1, fw2,.・ Fwn
Represents the weight fraction of each monomer relative to the total amount of monomers.

Resin (B) used in the coating composition of the present invention
Has an acid value of 0 to 200 KOH mg / g, particularly 0 to 150 KOH
KOHmg / g, hydroxyl value is 30 ~ 200KOHmg / g
g, especially in the range of 40 to 150 KOH mg / g, and the SP value of the water-dispersible resin (A) is larger by 0.1 to 1.5, especially 0.1 to 1. A value larger by 0 is preferable. It is preferable that the water-dispersible resin (B) does not contain an alkoxysilyl group. Acid number 20
If it exceeds 0 KOHmg / g, the performance of the coating film deteriorates. When the hydroxyl value is less than 30 KOH mg / g, the curability is lowered. On the other hand, when the hydroxyl value is more than 200 KOH mg / g, a large amount of unreacted hydroxyl groups remains in the coating film, so that the durability and the like are undesirably deteriorated.

On the other hand, when the SP value is less than 0.1, the compatibility between the water-dispersible resin (A) and the water-dispersible resin (B) is improved, so that a low-gloss matte coating film or a dice pattern is concealed. On the other hand, if the ratio is more than 1.5, the compatibility between the water-dispersible resin (A) and the water-dispersible resin (B) is remarkably deteriorated, and the storage stability of the paint is deteriorated.

The SP value of the water-dispersible resin (B) itself is 9.
The range of 1-13.1, especially 9.2-11.2.

Examples of the water-dispersible resin (B) include vinyl resins, polyester resins, fluorine resins, rubber resins, and modified resins thereof. These resins can be used alone or in combination of two or more.

Examples of monomer raw materials used in the above-mentioned vinyl resin include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate. Acrylate, tertbutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate, etc. Alkyl or cycloalkyl esters of (meth) acrylic acid, alkoxyalkyl esters of (meth) acrylic acid such as methoxybutyl (meth) acrylate, methoxyethyl (meth) acrylate, and ethoxybutyl (meth) acrylate Esters, esters of aromatic alcohol such as benzyl (meth) acrylate and (meth) acrylic acid, (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N-methylol (meth) acrylamide, etc. (Meth) acrylamide and its derivatives, (meth) acrylonitrile compounds,
(Meth) acrylic acid, 2-hydroxyethyl (meth)
Hydroxyalkyl (meth) acrylates such as acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate; polyethylene glycol mono (meth) acrylate; Plaxel FM1 (trade name, manufactured by Daicel Chemical Industries, Ltd .; Hydroxyl-containing unsaturated monomers such as caprolactone-modified (meth) acrylic acid hydroxyesters, Placcel FM2 (same as left), Placcel FM3 (same as left), Placcel FA1 (same as left), Placcel FA2 (same as left), and Placcel FA3 (same as left). Epoxy group-containing (meth) acrylic monomers such as glycidyl (meth) acrylate, perfluorobutylethyl (meth) acrylate, perfluoroisononylethyl (meth) acrylate, perfluorooctyl Ethyl (meth) a Relay - such bets Pa - fluoroalkyl (meth) acrylate - DOO acids such acrylic monomers such as -
Styrene, α-methylstyrene, vinyltoluene,
Examples thereof include vinyl aromatic compounds such as p-chlorostyrene and p-tert-butylstyrene, vinyl ethers such as ethyl vinyl ether and cyclohexyl vinyl ether, and other vinyl compounds such as vinyl acetate and vinyl chloride. be able to. The vinyl-based resin may be one or two or more of the above-mentioned monomer raw materials depending on the SP value and performance of the resin.
It is obtained by appropriately selecting at least one kind and (co) polymerizing according to a conventionally known radical polymerization method.

The vinyl resin has a weight average molecular weight of about 30.
Those having a range of from 00 to 200,000, particularly from 4000 to 100,000 are preferred. If the weight-average molecular weight is less than about 3000, the weather resistance, alkali resistance, workability and other properties deteriorate, and high gloss tends to be unfavorable. On the other hand, if the weight average molecular weight exceeds 200,000, the smoothness of the coating film decreases, which is preferable. Absent.

As the polyester resin, for example,
(Anhydride) phthalic acid, isophthalic acid, terephthalic acid, hexahydro (anhydride) phthalic acid, 4-methylhexahydro (anhydride) phthalic acid, 3-methylhexahydro (anhydride) phthalic acid, tetrahydro (anhydride) phthalic acid, (anhydrous ) Polybasic acid components such as trimellitic acid, adipic acid, (anhydrous) maleic acid, (anhydride) succinic acid and (poly) ethylene glycol, (poly) propylene glycol, butylene glycol, neopentyl glyco And a polyol component such as 1,6-hexanediol, trimethylolethane, tris (2-hydroxyethyl) isocyanurate, trimethylolpropane, glycerin and pentaerythritol. Obtained according to the condensation reaction method. In addition to the monomers described above, benzoic acid, P-te
The molecular weight can be adjusted by blending a monobasic acid component such as rt-butylbenzoic acid.

The polyester resin preferably has a weight average molecular weight in the range of about 500 to 100,000. If the weight average molecular weight is less than about 500, the weather resistance, alkali resistance, performance such as processability deteriorates, and the gloss tends to be high, which is not preferable. On the other hand, if it exceeds 100,000, the smoothness of the coating film decreases, which is preferable. Absent.

Crosslinking agent (C) used in the coating composition of the present invention
Is to react with hydroxyl groups of the water-dispersible resin (A) and the water-dispersible resin (B) to form a cured coating film. As the cross-linking agent, conventionally known melamine resins, block polyisocyanate compounds and the like can be used.

The crosslinking agent (C) is compatible with the water-dispersible resin (A) with the aid of a common organic solvent.
Those which are not completely compatible with each other under no solvent are preferred.

The above completely incompatible substances can be defined, for example, as follows.

The water-dispersible resin (A) and the crosslinking agent (C) are mixed with 40
/ 60 weight ratio, after adding 1.0 equivalent of an amine compound to the carboxyl group of the water-dispersible resin (A), and then dispersing in water to obtain an aqueous dispersion having a solid content of about 20% by weight. I do. This is coated on a transparent glass plate so as to have a dry film thickness of 10 μm, and after evaporating the solvent at room temperature to 100 ° C., further at 150 to 200 ° C. for about 5 to 10 μm.
Dry for minutes. If the coating film becomes turbid by visual observation in this state, the crosslinking agent (C) is added to the water-dispersible resin (A).
Can be said to be completely incompatible. More specifically, the light transmittance of the above-mentioned coating film at a wavelength of 4000 angstrom was measured using a spectrophotometer, and the transmittance was 95% or less, particularly 50 to 9%.
When it is in the range of 0%, it can be said that the crosslinking agent is not completely compatible with the water-dispersible resin (A).

As the melamine resin, for example, methanol
It is possible to use those modified with one or more alcohols such as ethanol, propanol, butanol, octyl alcohol, 2-ethylhexyl alcohol and the like. Preferably those modified with C3 or more, especially C4-18 alcohols. The melamine resin may contain, on average, about 2.0 or more, especially about 2.0 to 5.0 ether groups modified with C3 or more alcohol per nucleus of the triazine ring. preferable.

Examples of the block polyisocyanate include those conventionally known, for example, aliphatic and alicyclic polyisocyanate compounds such as isophorone diisocyanate and hexamethylene diisocyanate. Lactones such as ε-caprolactone and those blocked with alcohols such as propanol, butanol, pentanol and benzyl alcohol can be used.

The mixing ratios of the above components (A) to (C) are as follows in terms of total measurement conversion of the three components.

Water-dispersible resin (A): 29.9 to 84% by weight, preferably 55 to 75% by weight. Mixing ratio is 2
If the amount is less than 9.9% by weight, the coating film processability and weather resistance are poor, while if it is more than 84% by weight, the coating film processability and coating film smoothness are poor.

Water-dispersible resin (B): 0.1 to 20% by weight, preferably 1 to 15% by weight. If the blending ratio of the resin (B) is less than 0.1% by weight, the concealing ability of the dice is deteriorated, while if it exceeds 20% by weight, a coating storage stability and a low gloss coating film cannot be obtained.

Crosslinking agent (C): 15 to 50% by weight, preferably 20 to 40% by weight. If the blending ratio of the crosslinking agent (C) is less than 15% by weight, the curability of the coating film is inferior, and a low gloss coating film cannot be obtained. On the other hand, if it exceeds 50% by weight, the weather resistance of the coating film is poor. And a low gloss coating film cannot be obtained.

The coating composition of the present invention can be used, for example, as a bath coating, a replenishing coating and a gloss adjusting coating for electrodeposition coatings.

The coating composition of the present invention may optionally contain pigments, dyes, curing catalysts, fluidity modifiers, and the like.

The coating composition of the present invention is preferably applied particularly to the field of aluminum building materials using a colored or uncolored anodized aluminum material.

The coating method of the coating composition of the present invention includes, for example,
The coating composition of the present invention is applied to an anionic electrodeposition coating bath (for example, a solid content of about 5 to 20% by weight, preferably about 6 to 12% by weight).
After immersing the aluminum material in this bath, anion electrodeposition coating is performed so that the dry film thickness is about 5 to 30 microns, and then preferably washed with water (tap water, permeated water, etc.).
After baking (for example, at about 160 to 200 ° C. for about 20 to 4
0 minutes).

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments. The invention is not limited to the embodiments provided.

Production Example of Water-dispersible Resin (A-1) 275 g of isopropyl alcohol was charged into a reaction vessel and kept at 80 ° C. 75 g of styrene, 155 g of methyl methacrylate, 95 g of n-butyl acrylate , 50 g of ethyl acrylate, 75 g of 2-hydroxyethyl acrylate, 35 g of acrylic acid, 15 g of γ-methacryloxypropyltrimethoxysilane and 1 g of azobisdimethylvaleronitrile were added dropwise over 3 hours, and then azobisdimethyl 3 g of valeronitrile was added, and the mixture was kept at 80 ° C. for 3 hours to carry out a reaction.
% By weight of a water-dispersible resin (A) varnish was produced. The resin has a weight average molecular weight of about 30,000, an acid value of 53 KOH mg / g,
The hydroxyl value was 72 KOHmg / g, and the SP value was 9.48. γ-methacryloxypropyltrimethoxysilane was calculated as SP 9.60.

Production Example of Water Dispersible Resin (A-2) In Example 1, 20 g of styrene, 10 g of methyl methacrylate, and 2 g of n-butyl acrylate were used as monomers.
Production was carried out in the same manner as in Example 1 except that 40 g, 105 g of ethyl acrylate, 75 g of 2-hydroxyethyl acrylate, 35 g of acrylic acid, and 15 g of γ-methacryloxypropyltrimethoxysilane were used. The resin has a weight average molecular weight of about 30,000, an acid value of 53 KOH mg / g,
The hydroxyl value was 72 KOHmg / g, and the SP value was 9.12.

Production Example of Water-dispersible Resin (B-1) In Example 1, 75 g of styrene, 245 g of methyl methacrylate, and 45 g of ethyl acrylate were used as monomers.
g, 2-hydroxyethyl acrylate 95 g, and acrylic acid 40 g were used in the same manner as in Example 1. The resin has a weight average molecular weight of about 30,000 and an acid value of 62 KO.
Hmg / g, hydroxyl value 92KOHmg / g, SP value 9.
77.

Production Example of Water-Dispersible Resin (B-2) In Example 1, 75 g of styrene, 120 g of methyl methacrylate, 145 g of n-butyl acrylate, 50 g of ethyl acrylate, 75 g of 2-hydroxyethyl acrylate were used as monomers. The production was carried out in the same manner as in Example 1 except that 35 g of acrylic acid was used. The resin had a weight average molecular weight of about 30,000, an acid value of 53 KOH mg / g, a hydroxyl value of 72 KOH mg / g, and an SP value of 9.38.

Melamine resin (C): Nicalac MX-4
30 (manufactured by Sanwa Chemical Co., Ltd., trade name, melamine core 1)
Per unit, about 3 methyl groups, about 3 butyl groups,
The amount of mononuclear was about 57%).

Example 1 65 g (solid content) of the resin (A-1) and the resin (B-
1) In a mixed resin with 5 g (solid content), 0.4 equivalent of triethylamine with respect to the carboxyl group of the resin was blended, mixed and dispersed, and then 30 g of melamine resin (C) was added thereto. After mixing and dispersing, while stirring, deionized water is gradually added dropwise so as to have a resin solid content of 10% by weight, and then the pH is adjusted with triethylamine so as to be 7.0, and the electrodeposition paint Was manufactured. Further, copolymer (A) 40 / melamine resin (C) 6
The light transmittance of the coating film having a weight ratio of 0 was 95%.

Aluminum material (anodized aluminum material having a film thickness of about 10 microns, maximum die height of 1-2 μm,
The electrodeposition paint of Example 1 was used as an electrodeposition bath having a size of width 20 cm × length 30 cm). Electrodeposition coating was performed in the electrodeposition bath so as to have a film thickness of about 7 μm and about 10 μm. , 1
The aluminum material of Example 1 was obtained by baking at 70 ° C. for 30 minutes.

Example 2 65 g of the above resin (A-2) was used as the resin in Example 1.
An aluminum material was obtained in the same manner as in Example 1, except that a mixed resin of (solid content) and 5 g (solid content) of resin (B-1) was used.

Comparative Example 1 65 g of the above resin (A-1) was used as the resin in Example 1.
An aluminum material was obtained in the same manner as in Example 1 except that a mixed resin of (solid content) and 5 g (solid content) of resin (B-2) was used.

Table 1 shows the results.

[0051]

[Table 1]

Paint storage stability: Paint was placed in a test tube (height 20
cm, capacity: 20 cc) and allowed to stand at 20 ° C. for 7 days, and then the height of the residue settled at the bottom of the container was examined. ◎ is good when the residue is 0.5 mm or less, and ○ is 0.6 mm to 5 residue.
mm indicates almost good, Δ indicates that the residue is slightly poor at 6 mm to 10 mm, and X indicates poor at 11 mm or more.

Test Method for Coating Film Performance Coating smoothness: The coating film surface (wrinkle skin, unevenness, etc.) was visually evaluated. ◎ indicates good, は indicates almost good, △ indicates slightly poor, and × indicates bad.

Die blindness: Evaluated by visual evaluation, gloss and L value.

Visual observation: は indicates good dice eye concealing property, Δ indicates poor dice concealing property, and X indicates extremely poor dice concealing property.

L value: Measured using a variable-angle spectrophotometer GCMS-4 (trade name, manufactured by Murakami Color Research Laboratory). Incident angle 4
The measurement was performed by changing the light receiving angle to 10, 30, 45 (specular reflection angle), and 90 degrees with respect to 5 degrees. As the L value is larger, the coating film becomes whiter and more cloudy, and the dice blinding property becomes better. It is preferable that the variation of the L value due to the light receiving angle is small.

Gloss: Measured using a gonio-gloss meter UGV-50 (trade name, manufactured by Suga Test Materials Co., Ltd.). The measurement angles were 45 degrees, 60 degrees, and 85 degrees. It is preferable that the variation in gloss due to the angle is small.

[0058]

According to the coating composition of the present invention, when a coating film electrodeposited on an aluminum substrate is baked, the resin B component having a high SP value undergoes phase separation with the resin A component having a low SP value, It is presumed that the phase-separated resin B component migrated to the surface of the anodized aluminum base material having high polarity, and material defects such as dice, alumite, and coloring unevenness could be improved.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) C09D 175/04 C09D 175/04 F-term (Reference) 4J038 CG031 CG032 CG071 CG072 CG141 CG142 CH121 CH122 DL001 GA03 GA06 GA15 KA03 MA08 MA10 NA01 PA04

Claims (1)

[Claims] 1. The following component (A): a water-dispersible resin having an acid value of 15 to 80 KOH mg / g and a hydroxyl value of 30 to 200 KOH mg / g and having an alkoxysilyl group in a side chain and having a solubility parameter of 9.0 to 11.6. (B) a resin having an acid value of 0 to 200 KOH mg / g, a hydroxyl value of 30 to 200 KOH mg / g, and a solubility parameter of 9.1 to 13.1, and the resin (B) used 0.1 to 20% by weight of resin whose solubility parameter value is 0.1 to 1.5 larger than the solubility parameter value of the resin (A) to be used. (C) 15 to 50% by weight of crosslinking agent. A matte anion type electrodeposition coating composition characterized by containing as a component.