JPH0224372A - Curable coating material - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance and mechanical properties of a nitrogenous alkyd resin coating film without detriment to the pigment dispersibility of the coating material by using a specified epoxy resin-modified nitrogenous alkyd resin as a vehicle component. CONSTITUTION:An epoxy resin-modified nitrogenous alkyd resin of a hydroxy value of 30-200 is obtained by performing an addition reaction of an epoxy resin with a nitrogenous alkyd resin of a number-average MW of 200-5000, obtained by condensing a polybasic acid (e.g., maleic acid) with an amine compound having at least two active hydrogen atoms in the molecule, of formula I-III (wherein R1-6 are each H, an alkyl, an aryl or a cycloalkyl; R7 is R1, -CnH2n-OH group; n is 1-4; m is 0-4; when m is 0, at least two of R1-4 are hydrogen atoms, and either of R5-6 is a hydrogen atom; and when m is 1, at least one of R1-4 is a hydrogen atom) and, optionally, a polyhydric alcohol (e.g., ethylene glycol) and a fatty acid (e.g., dimer acid) at 150-250 deg.C for 1-15hr. The resin is dissolved or dispersed in an organic solvent and/or water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a curable paint whose vehicle component is an epoxy resin modified product of a nitrogen-containing alkyd resin having a nitrogen atom in its main skeleton.

(Prior art) Alkyd resin paints whose vehicle component is an alkyd resin (fatty acid modified) made by reacting a polybasic acid and a polyhydric alcohol (and fatty acids may also be used together) are:
It is low cost, has excellent paint workability, adhesion, and texture (especially in solid color finishes), and is used in a wide range of fields.

However, in today's era of rapid technological innovation, the level of performance required for paints is inevitably high.
Regarding alkyd resin paints, the pigment dispersibility and pigment dispersion stability (finished appearance such as gloss and sharpness of the paint film) are poor, and the adhesion, corrosion resistance, chemical resistance, and mechanical Performance such as physical characteristics is inferior.

In response to this, the present applicant proposed a nitrogen-containing alkyd resin in which nitrogen atoms were introduced into the main skeleton of the alkyd resin (Japanese Patent Laid-Open No. 6
However, the nitrogen-containing alkyd resin paint was not satisfactory in fields where high corrosion resistance, mechanical properties, and other coating film performances are required.

(Problems to be Solved by the Invention) The purpose of the present invention is to provide a composition that improves the corrosion resistance and mechanical properties of a nitrogen-containing alkyd resin coating without deteriorating the pigment dispersibility of the coating. It has been done.

(Means for Solving the Problems) The present invention relates to an amine compound containing an average of two or more active hydrogens in one molecule, a polybasic acid, and, if necessary, a polyhydric alcohol and a fatty acid. The present invention relates to a curable paint characterized in that a vehicle component is an epoxy resin-modified nitrogen-containing alkyd resin obtained by modifying a nitrogen alkyd resin with an epoxy resin.

The epoxy resin-modified nitrogen-containing alkyd resin, which is the vehicle component of the paint of the present invention, is obtained by condensing a component that contains a polybasic acid and an amine compound as essential components, and further contains a polyhydric alcohol and a fatty acid as necessary. It is made by modifying a nitrogen-containing alkyd resin with an epoxy resin.

Polybasic acids are composed of polycarboxylic acid compounds having two or more carboxyl groups in one molecule, such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecynylsuccinic acid, and these compounds. Aliphatic saturated dibasic acids such as anhydrides, aliphatic unsaturated dibasic acids such as maleic acid, fumaric acid, itaconic acid and their anhydrides, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid and aromatic polybasic acids such as their anhydrides, tetrahydrofucric acid, methylcyclohexenetricarboxylic acid, hexahydrophthalic acid, Himic acid, Hett's acid, tetrachlorophthalic acid, cyclohexanedicarboxylic acid, methylhexahydrophthalic acid, Examples include alicyclic polybasic acids such as hexahydrotrimellitic acid and their anhydrides, and one selected from these
fffi or two or more types can be used.

The amine compound to be reacted with a polybasic acid has in its molecule an active hydrogen that can react with the carboxyl group in the polyhydrochloric acid compound, and has an average of 2 or more active hydrogens, preferably an average of 2 to 6 active hydrogens per molecule. It has a range of . The above active hydrogen means an active hydrogen atom contained in a functional group such as 0H1NH (C-NH-C bonded secondary amine group), NHI (C-NH, bonded primary amino group), etc. .

Examples of the amine compound include general formula (I) (I) where R,, R,, R1 and R4 are the same or different,
Each represents a hydrogen atom, an alkyl group, an aryl group, or a cycloalkyl group, n represents an integer of 1 to 4, and m represents 0.
Indicates an integer of ~4, provided that when m is 0, R,, R,
, R1 and R4 are hydrogen atoms. Further, when m is 1, at least one of R1, R1, R, and R4 has a hydrogen atom.

An amine compound having a primary amino group and/or a secondary amino group represented by the general formula (II) represents a hydrogen atom, an alkyl group, an aryl group, or a cycloalkyl group, and n and m are the same as above. Indicates the meaning, provided that when m is 0, one of Ro and Ro is a hydrogen atom.

An alkanolamine compound having one hydroxyl group and a primary amino group or a secondary amino group in one molecule represented by the general formula (III) 0H-CnHall In the formula, R- is a hydrogen atom, an alkyl group, or an aryl group. group, cycloalkyl group, -C1H, n-OH group, and n has the same meaning as above.

Examples include polyhydric alkanolamine compounds having two or more hydroxyl groups in one molecule represented by:

In the above general formulas (I), (II) and (Ill), examples of the "alkyl group" include methyl, ethyl, n
-propyl, 1so-propyl, n-butyl, 1s
o-butyl, 5ee-butyl, tert-butyl, n
-hexyl, 2-ethylhexyl, lauryl, etc., among which preferred is a lower alkyl group of CI to 4. Moreover, as the "cycloalkyl group", a cyclohexyl group is preferably mentioned. Furthermore, examples of the "aryl group" include phenyl group, tolyl group, xylyl group, and the like.

Specific examples of general formula (1) include NH, -C2H
,-Nl(,, N H□-C-H4NHC2H4-NHa, N H2+
C2H--N Hh Cz H--N Ha.

NH2-C, H6-NH-C, H, -NH,, (Cz
Hs ) t N C-Ha -NH- and the like.

Further, as a specific example of the general formula (IT), example λ0H-C
H, -NH,, 0H-C, H, -NH,, OH-CH* -NHCHs.

0H-C, H4-NH-CH,.

0H-C, H, -NH-C, H%, OH-Cm H4-NH-Cs Ht, 0H-C*
H, -NH-CI H, CH3,0H-C, H, -NH
-C, H,, CH, -CH,, 0H-C, H@-NH2, 0H-C, H, -NH-CH,, 0H-CI H@-Nl(-C* H,, OH-Cs
H* -N H-Cs H-1OH-C-H--N H
-Cz H4CHs, 0H-C, H, -NH-C4H,
, CH* -CH-1 OH-C2H, -NH-C, H, -NH□.

OH+C2H4-N1 month TC-H4N Hz, CHS
-CH-CH2-NH-C, H4-NH.

CH etc.

Further, as specific examples of the general formula (Ill), for example, (OH-Cz H4)7NH1 (CHa-CH-CH2)yNH5 H (CH=　　　　CH-CH2)-rN　CH-5CH (OH-C, H41, -N, (CH--CH-CHx hN H etc.

The ratio of both components in the condensation reaction of the above polybasic acid and amine compound is as follows: polybasic acid/amine compound (
The molar ratio) is suitably in the range of 0.5 to 1.2, particularly preferably 0.7 to 1.0, and the ratio of the amine compound used is Demonstrates excellent pigment dispersibility, hydrolysis resistance, weather resistance, and adhesion to materials based on the total amount of compounds (including the total amount in systems that use polyhydric alcohols and fatty acids below). From this point of view, 0.5 to 55% by weight, preferably 0.5 to 40% by weight, particularly preferably 1 to 20% by weight is desirable.

Examples of polyhydric alcohols that can be used as necessary include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butanediol, neopentyl glycol, 1.2-1.3-12.3-11. 4-butylene glycol, bentanediol, 2.3-dimethylpropanediol, 1.6-12.5-hexanediol, hydrogenated bisphenol A, cyclohexane dimetatool,
trimethylene glycol, tetramethylene glycol,
Examples include hexamethylene glycol, trimethylolethane, trimethylolpropane, glycerin, diglycerin, dipene querrythritol, and sorbitol, and one or more selected from these can be used.

Further, as the fatty acids, drying oil (including semi-drying oil) fatty acids (iodine value of about 100 or more), non-drying oil fatty acids (iodine value of less than about 100), and these fats and oils can be used. Drying oil fatty acids include, for example, safflower oil fatty acids, linseed oil fatty acids, soybean oil fatty acids, sesame oil fatty acids, poppy oil fatty acids, eno oil fatty acids, hempseed oil fatty acids, grape kernel fatty acids, corn oil fatty acids, tall oil fatty acids, Examples include sunflower oil fatty acids, cottonseed oil fatty acids, walnut oil fatty acids, tung oil fatty acids, dehydrated castor oil fatty acids, rice bran oil fatty acids, and dimer acids thereof, and non-drying oil fatty acids include, for example, coconut oil fatty acids. The amount of these fatty acids used is 0 to 60% by weight, preferably 5 to 60% by weight, more preferably 10 to 60% by weight, based on the total amount of the polybasic acid component, polyhydric alcohol component, and the fatty acid. A range of 45% by weight is suitable.

The nitrogen-containing alkyd resin is prepared by adding a polybasic acid and an amine compound, and further including a polyhydric alcohol and a fatty acid as necessary, under the same conditions as for a normal alkyd resin, for example, 150%
It can be produced by reacting at ~250°C for 1 to 15 hours.

The nitrogen-containing alkyd IM resin thus obtained is equivalent to 1 kg of resin.
There are an average of 0.08 or more, preferably an average of 0.1 to 3.
It has a range of 0 carboxyl and/or amino functional groups. When the number of functional groups is less than 0.08 on average,
Since there is a large amount of epoxy resin that does not chemically bond with the nitrogen-containing alkyd resin, the storage stability of the paint may be poor, and the paint film may have poor gloss, adhesion to materials, corrosion resistance, mechanical properties, chemical resistance, etc. The nitrogen-containing alkyd resin can also have a number average molecular weight in the range of about 200 to 5000, preferably about 300 to 3000.

Next, the epoxy resin, which is a modified resin of the nitrogen-containing alkyd resin, is a polyepoxide having an average of two or more epoxy groups per molecule, and a polyepoxide having an average of one or more epoxy groups per molecule, which is obtained by modifying the polyepoxide with a monobasic acid. It is an epoxide with an epoxy group. Examples of polyepoxides include epoxy fl fat obtained from bisphenol and shrimp halohydrin, epoxy resins obtained from hydrogenated bisphenol and shrimp halohydrin, or bisphenol and β-shrimp halohydrin. Particularly preferred among these are epoxy resins obtained from bisphenol and ebihalohydrin.
2, Epicote 152, Epicote 154, Epicote 1001, Epicote 1002, Epicote 1003,
Epicote 1055, Epicote 1004, Epicote 1007, Epicote 1009, Epicote 1010,
Ciba Geigy Araldite 6071, Araldite 6084, Araldite 6097, Araldite 60
99, Araldite 7004, Ebicuron N-730, Ebicuron N-740 manufactured by Dainippon Ink Co., Ltd., and the like.

In addition to the above, a) polyglycidyl ethers of novolak resins, b) polyglycidyl ethers of polyhydric alcohols such as ethylene glycol, propylene glycol, glycerin, and trimethylolpropane, C) adipic acid, phthalic acid,
Polyglycidyl ethers of polycarboxylic acids such as dimer acid, d) alicyclic olefins, polyepoxides obtained by epoxidizing l,2-polybutadiene, and the like can be used. These polyepoxides are preferably used in combination with the epoxy resin in an amount that does not impair its corrosion resistance (generally, 50 parts by weight or less per 100 parts by weight of the epoxy resin).

As the monobasic acid for modifying the polyepoxide, for example, the fatty acid used in the nitrogen-containing alkyd resin can be used.

The blending ratio of epoxy resin is 100% nitrogen-containing alkyd resin.
About 1 to 50 parts by weight, preferably about 3 to 3 parts by weight
It is in the range of 0 parts by weight. If the blending ratio is less than about 1 part by weight, coating film performance such as adhesion to materials, corrosion resistance, chemical resistance, flexibility, etc. will be insufficient; on the other hand, if the blending ratio is about 50 parts by weight,
If the amount exceeds 1 part by weight, the pigment dispersibility will be poor, resulting in defects such as spots, color separation, and blurring of the paint film, or separation of the pigment component and resin component will occur during storage of the paint, causing the pigment component to leak into the storage container. It is not preferable because it settles to the bottom of the container and hard cakes, making redispersion difficult.

The epoxy resin-modified nitrogen-containing alkyd resin used in the present invention is prepared by combining the nitrogen-containing alkyd resin and the epoxy resin under conventionally known reaction conditions (epoxy group and carboxyl group or amino group) at a temperature of about 130 to 200°C. 1~
It can be produced by continuing the addition reaction for 6 hours.

The curable paint of the present invention can be either an organic solvent system using mainly an organic solvent as the solvent (or dispersion medium or diluent) or an aqueous system using mainly water (which may also contain a small amount of organic solvent). It is preferable to prepare the above-mentioned epoxy resin-modified nitrogen-containing alkyd resin according to these forms. That is, in an organic solvent system, the hydroxyl value is 30 to 200, particularly 30 to 150, and the acid value is 30 or less. It is preferable to adjust the hydroxyl value in an aqueous system to 30 to 200, especially 30 to 1.
50, and the acid value is preferably adjusted to 10 to 200.

Further, among the above-mentioned epoxy resin-modified nitrogen-containing alkyd resins, those modified with fatty acids (particularly dry or semi-drying oil fatty acids) can form a cured coating film alone without blending with the following crosslinkable resin.

Further, in the curable paint of the present invention, a crosslinkable resin can be blended with the nitrogen-containing alkyd resin and crosslinked and cured in a three-dimensional network by heating. The crosslinkable resin is a compound having a functional group (eg, hydroxyl group, alkyl ether group, incyanate group, etc.) that crosslinks with the hydroxyl group in the nitrogen-containing alkyd resin. Specifically, 1 selected from methylolated or monohydric alcohols (1 to 5 carbon atoms)
Examples include alkyl etherified melamine resins, urea resins, and benzoguanamine resins that have been modified with more than one species. Examples of isocyanate compounds include tolylene diisocyanate, an adduct of tolylene diisocyanate and trimethylolpropane, diphenylmethane diisocyanate, methylene diisocyanate, hexamethylene diisocyanate, an adduct of hexamethylene diisocyanate and trimethylolpropane, xylylene diisocyanate, and lysine diisocyanate. And so on. Furthermore, the incyanate group may be blocked with a blocking agent, such as phenol, thiourea, methanol, propatool, n-butanol, t-butanol, ethyl acetoacetate, dimethyl malonate, ε- Examples include caprolactam.

In the curable paint of the present invention, the blending ratio of the epoxy resin-modified nitrogen-containing alkyd resin and the crosslinkable resin is based on the total amount of the epoxy resin-modified nitrogen-containing alkyd resin and the crosslinkable resin. Resin 95-60
% by weight, especially 85-70% by weight, crosslinkable resin 5-40% by weight, especially 15-30% by weight are preferred.

The curable paint of the present invention is a liquid paint that uses an organic solvent and/or water as a solvent or dispersion medium.
Hydrocarbons such as xylene, naphtha, mineral spirits, octane, and cyclohexane, alcohols such as methanol, ethanol, butanol, cyclohexanol, and heptatool, and ethers such as dioxane, methyl cellosolve, butyl cellosolve, and methyl calpitol and butyl calpitol. ethyl acetate, butyl acetate, methyl cellosolve acetate, cellosolve acetate, carpitol acetate and other ester systems, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone and other ketone solvents. In addition, water-based paints can be mixed with basic substances such as ammonia, trimethylamine, triethylamine, monoethanolamine, jetanolamine, triethanolamine, dimethylethanolamine, diethylethanolamine, morpholine, and other amine compounds, caustic soda. It can be obtained by neutralizing with a hydroxide such as caustic potash, ammonia, etc., and dissolving or dispersing them in water (containing an organic solvent and water may also be used).

In addition to one of the above-mentioned components, the curable paint of the present invention can also contain coloring pigments, extender pigments, metallitter pigments, anti-sagging agents, curing accelerators, etc., which are already known per se.

Furthermore, the curable paint of the present invention can be applied by curving, flow coating, spray (air, airless) coating, electrostatic coating, dip coating, curtain flow coater, electrodeposition coating, etc. Non-volatile concentration is 10-7
A wide range of 0% by weight is acceptable, and the coating film thickness is suitable to be 15 to 40μ, even if it is a dry coating. ~20
(at 0° C. for 10 to 40 minutes). The objects to be coated include, for example, untreated metal, metal whose surface has been treated with phosphates, chromates, etc., already coated with primer or intermediate coating,
Examples include objects that have been coated with a top coat, such as plastic (especially polyamide resin), wood, and glass.

(Action and Effect of the Invention) In the present invention, the epoxy resin component in the epoxy resin-modified nitrogen-containing alkyd resin is chemically bonded to the nitrogen-containing alkyd resin, and the pigment dispersibility and pigment dispersion of the nitrogen-containing alkyd resin component are stabilized. It exhibits the effect of reinforcing the corrosion resistance and mechanical properties of the nitrogen-containing alkyd resin component without deteriorating its properties, and the effect is remarkable.

(Example) Production examples, examples, and comparative examples of the epoxy resin-modified nitrogen-containing alkyd resin used in the present invention will be described below.3 Production Example 1 Ethylene glycol 7.3 parts by weight, methylpropanol amine 5.2 parts by weight parts, bentol 16.4 parts by weight, adipic acid 17.1 parts by weight, isophthalic acid 24.3 parts by weight,
A mixture consisting of 16.4 parts by weight of tall oil fatty acid and 3 parts by weight of xylene was reacted in a nitrogen gas atmosphere at 160 to 230°C with stirring for about 12 hours, and then 4.8 parts by weight of Epicoat 1001 was added. The reaction was carried out at .degree. C. for 4 hours, and 8.7 parts by weight of phthalic anhydride was further added by half-esterification to obtain an epoxy-modified nitrogen-containing alkyd resin (A-1) used in the present invention. The resin (A
Regarding -1), the hydroxyl value is 70, the acid value is 43, the polybasic acid/polyhydric alcohol (molar ratio) is 0.9, the alkanolamine content is 4.9% by weight, and the fatty acid content is 18.1% by weight. %, and the epoxy content was 4.8% by weight.

Production Example 2 20.4 parts by weight of trimethylolpropane, 8.5 parts by weight of ethyldibrobanolamine, 30.0 parts by weight of phthalic anhydride, 29.9 parts by weight of linseed oil fatty acid, Epicoat 10
A mixture consisting of 16.7 parts by weight of 04 and 3 parts by weight of xylene was reacted in the same manner as in Production Example 1 above to prepare an epoxy-modified nitrogen-containing alkyd resin (A-2) used in the present invention. Regarding the resin (A-2), the hydroxyl value is 45,
Acid value is 8, polybasic acid component/polyhydric alcohol component (molar ratio) is 0.95, fatty acid content (oil length) is 30% by weight, alkanolamine content is 5.4% by weight, epoxy content is 16 It was .7% by weight.

Production Example 3 24.2 parts by weight of neopentyl glycol, 8.7 parts by weight of triethanolamine, 30.4 parts by weight of phthalic anhydride,
A mixture consisting of 23.7 parts by weight of soybean oil fatty acid, 3 parts by weight of xylene, and 13.0 parts by weight of Ebicor 1007 was reacted in the same manner as in Production Example 1 to prepare the epoxy-modified nitrogen-containing alkyd resin (A) used in the present invention. -3) was created. Regarding the resin (A-3), the hydroxyl value is 110, the acid value is 3, and the polybasic acid component/polyhydric alcohol component (molar ratio) is 0.
．． 71, fatty acid content (oil length) is 30% by weight, alkanolamine content is 8.7% by weight, epoxy content is 13
% by weight.

Production Example 4 A mixture consisting of 27.8 parts by weight of neopentyl glycol, 9 parts by weight of trimethylolpropane, 35 parts by weight of phthalic anhydride, 27.2 parts by weight of soybean oil fatty acid and 3 parts by weight of xylene was prepared in the same manner as in Production Example 1. By reacting, an alkyd resin for comparative example was prepared.

Production Example 5 When a mixture consisting of 90 parts by weight of the alkyl resin, 210 parts by weight of triethanolamine and 3 parts by weight of xylene prepared in Production Example 4 was reacted under the same conditions as Production Example 1, gelation occurred during the reaction. Therefore, the reaction was stopped.

Examples and Comparative Examples Example 1 The resin (A-1) obtained in Production Example 1 was neutralized in an equivalent amount with diethylamine ethanol to obtain a water-solubilized product, and then the resin (A-1) was
) per 100 parts by weight (solid content) of water-soluble methanol-modified melamine resin (manufactured by Sumimaru Kagaku Co., Ltd., trade name Sumimaru M-
30W) 25 parts by weight (solid content), 125 parts by weight of titanium white pigment (manufactured by Teikoku Kako Co., Ltd., trade name JR-600E), butyl cellosolve and water, mixed and dispersed in a ball mill to obtain a non-volatile content of 50 parts by weight. % of colored paint l were produced.

Example 2 To the resin (A-2) obtained in Production Example 2, (M resin (A-2) 1
Per 00 parts by weight (solid content), butoxymelamine resin (
Manufactured by Mitsui Toatsu, product name Kneepan 20SE) 30 parts by weight (
Solid content), 20 parts by weight of precipitated barium sulfate, 20 parts by weight of Mabiko Yellow XLO, and a solvent (butanol, xylene) were mixed in a sand mill to produce colored paint 2 with a dispersed non-volatile content of 45% by weight.

Example 3, Comparative Example/Per 100 parts by weight of each resin solid content obtained in Production Examples 3 and 4, 25 parts by weight of Kneepan 20SE (solid content),
Carbon black 600E (Nagao Sangyo, product name) 6.
25 and a solvent (imbutanol, xylene), the mixture was applied in a ball mill to an iron plate surface-treated with iron phosphate, and various coating film performance tests were conducted on the coated plate, which was cured by heating.The results are shown in the table below. It was as follows.

Colored paint 4 (blended with the alkyd resin of Production Example 4) was produced.

Performance test results Colored paints 1 to 4 (*l) obtained in the above examples and comparative examples
Painted surface condition: Visual judgment, smoothness, repellency, and presence of dents were examined.

(*2) Corrosion resistance: Cross-cut the paint film to reach the base material, and after testing with a Tsuruto sprayer for 360 hours, apply adhesive cellophane tape to the cut part, peel it off, and remove the paint film from the cut part. The peeling process on both sides was investigated.

(*3) Acid resistance: N/10ta acid aqueous solution was dropped onto a horizontally supported painted surface, and the condition of the painted surface was examined after leaving it for 48 hours. O indicates that no abnormality is observed.

(*4) The same procedure as above (*3) was carried out except that an alkali-resistant 2N15 caustic soda aqueous solution was used. 0 indicates that no abnormality was observed, and △ indicates that whitening, glossy pixelation, etc. were observed.

(*, 5) Bending resistance: radius of curvature 4 with the coating outside
The state of the coated surface when bent with 1 ml of II was examined. ○ indicates that no abnormality was observed; △ indicates that cracking and peeling were observed.

(*6) Solvent resistance: The coated plate was immersed in toluene (20°C) for 5 hours, and then the condition of the coated surface was examined. ○ indicates that no abnormality is observed.

(*7) Adhesiveness: The coated plate was immersed in water at 40°C for 48 hours, then pulled up and left for 1 hour, and then cut in the same manner as in (*8) to examine adhesion.

(*8) Recoatability: Paint each colored paint on the iron plate so that the cured film thickness is 30μ, bake it at 180℃ for 30 minutes, and then recoat the same paint so that the cured film thickness is 20μ. , and was rebaked at 120°C for 30 minutes.

Next, use a razor to reach the substrate to make 100 goblets of size 1 x 1 mm on the paint film, stick adhesive cellophane tape on the surface, and remove the remaining goblin paint film. I looked up the numbers.

(*9) Storage stability: Colored paints stored at 40°C for 20 days were tested. The paint condition was determined by examining the presence or absence of pigment sedimentation; 0 indicates that no abnormality was observed, and Δ indicates that pigment precipitation was clearly observed.

Claims (1)

[Claims] 1. A nitrogen-containing alkyd resin obtained by condensing an amine compound containing an average of two or more active hydrogens per molecule, a polybasic acid, and, if necessary, a polyhydric alcohol and a fatty acid, is modified with an epoxy resin. A curable paint characterized by having an epoxy resin-modified nitrogen-containing alkyd resin as a vehicle component.