JPH0464633B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an improved water-dispersible resin composition for coating, and more particularly, a specific amount of anticorrosion pigment is added to an alkyd resin or its derivative, and the mixture is thoroughly mixed and then immersed in water. This invention relates to a resin composition which is dispersed and has excellent antirust properties. [Prior Art and Problems to be Solved by the Invention] Conventionally, various rust-preventing pigments have been used for the purpose of coating metal materials to prevent rust. Most of these are oil-based paints, and the vehicle component is a mixture of alkyd resin, boiled oil, or natural resin, and components such as coloring pigments, extender pigments, and anti-rust pigments are kneaded into the vehicle component. It is a thing of form. However, the organic solvents contained in such oil-based paints are not preferable from the viewpoint of resource saving and safety. Water-based paints are one type of paint that satisfies these needs, and as research has progressed more and more in recent years, they are gaining ground as resource-saving paints. By the way, with the progress of recent improvement research, water-based resins are gradually approaching the level of oil-based resins (solvent-based resins) in terms of anti-corrosion ability, but the essential characteristics of water-based resins are The problem is that the water-based resin, which also serves as the vehicle in the paint, is an emulsifier and has a large amount of hydrophilic groups (hydrophilic functional groups), so the water absorption of the paint film is high.
Therefore, since the generation and progression of rust cannot be suppressed, the rust-preventive power is reduced, and as a result, water-based paints are generally inferior in rust-preventive power compared to oil-based paints. Recently, soap-free emulsions that do not use emulsifiers have been known in the literature, but the stability of the resulting aqueous dispersions is poor, and it is therefore difficult to say that they are of practical use. On the other hand, although water-soluble resins are superior to emulsions in terms of anti-corrosion properties, they are treated with a large amount of hydrophilic functional groups such as carboxyl groups and hydroxyl groups to make the polymer water-soluble. Therefore, it can be said that this is also undesirable from the point of view of anti-corrosion ability. Therefore, various types of rust-preventing pigments are widely used in order to improve their rust-preventing ability.However, since many of these rust-preventing pigments are polyvalent metal salts, for example, amine-neutralized pigments are commonly used. In the case of type water-soluble resins, so-called metal crosslinks are likely to be formed between carboxyl groups, hydroxyl groups, etc. in the resin and these polyvalent metal ions, and as a result, polymer aggregation is caused. Similarly, in the case of water-dispersed resins such as dispersions and emulsions, polyvalent metal ions as anticorrosion pigments tend to crosslink with hydrophilic groups on the surface of polymer particles and cause polymer aggregation. This results in poor stability as a paint, which limits the practical use of antirust pigments used in water-based paints.
In the end, the actual situation is that the water-based paint is not preferable in terms of improving rust prevention ability. By the way, anti-corrosion pigments are usually mixed together with a vehicle as a pigment component during the preparation of paints, but for the reasons mentioned above, the finished paints are poor in stability and even worse. “Watering” during storage of paint, sedimentation of pigments,
The reality is that there are many problems such as "color separation", thickening and gelation, and the tendency to "fading" and "blotting" the paint film. [Means for Solving the Problems] However, as a result of intensive studies by the present inventors to solve or eliminate the various problems and drawbacks of conventional water-based paints as described above, the present inventors decided to use an emulsifier. Instead, the rust-preventive pigment is thoroughly mixed with the resin in advance so that the rust-preventive pigment is incorporated into the polymer particles, and then the hydrophilic groups in the resin are utilized or an emulsifier is added only at this point. Furthermore, by dispersing the resin (polymer particles) containing the rust-preventive pigment in water by both the use of hydrophilic groups and the addition of an emulsifier, it is possible to eliminate conventional rust-preventive pigment-containing resins (polymer particles). We have discovered a water-dispersible resin composition for coating that has excellent anti-rust properties, which greatly improves the stability of the paint, which was a drawback of water-based paints, and can also be used as a water-dispersible paint with excellent corrosion resistance. He has completed his invention. That is, the present invention provides a water-dispersible resin composition comprising an alkyd resin or its derivative (A) and an anticorrosion pigment as essential components, and furthermore, 100% by weight of the alkyd resin or its derivative (A). 0.05 to 20 parts by weight of the rust preventive pigment (B) is added to the alkyd resin or its derivative (A) and mixed thoroughly, and then the alkyd resin or its derivative (A) is added with a hydrophilic group and/or an emulsifier ( C) and dispersed in water,
The present invention provides a water-dispersible resin composition for coating that has excellent antirust properties. The water-dispersible resin composition of the present invention contains an anti-rust pigment inside the polymer particles, and therefore, the conventional method of blending and mixing the anti-rust pigment with a vehicle when preparing a paint is different from the conventional method. In comparison, first of all, it is excellent in stability, and moreover, the paint obtained using the resin composition of the present invention has a coating film that has excellent rust-preventing power without impairing the inherent ability of the rust-preventing pigment. It gives Here, the alkyd resin (A) described above is not particularly limited as it can be prepared according to any known and commonly used method, but for example, oil or fatty acid (a-1), polyol (a-
2) Various raw materials such as a polybasic acid (a-3), a C ₆ to C ₁₈ monobasic acid (a-4), and an epoxy resin (a-5) are charged into a reaction vessel and heated under a nitrogen gas atmosphere. The reaction is carried out at a temperature ranging from 140 to 300°C, preferably from 150 to 250°C, until the desired acid value is reached. The acid value of the finished resin is 70 or less, preferably
If it is less than 50 but exceeds 70, the corrosion resistance and water resistance of the paint film will be poor, and therefore the rust prevention ability will be deteriorated, and the stability of the paint will also be poor. So I don't like it. Typical raw materials used to prepare the alkyd resin (A) include tung oil, linseed oil, dehydrated castor oil, safflower oil, soybean oil, castor oil, tall oil, rice bran oil, and So-called drying oils, semi-drying oils such as coconut oil, and their fatty acids [hereinafter abbreviated as oils or fatty acids (a-1)]. ] or a mixture of two or more selected from the following, and examples of the polyol (a-2) include ethylene glycol, propylene glycol,
Polyethylene glycol or polypropylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butylene glycol, 1,4-butylene glycol, with an average molecular weight () of 400 to 20,000;
2,2,4-trimethyl-1,3-pentanediol, 1,6-hexanediol, cyclohexanedimethylol, dimethylolpropionic acid, glycerin, trimethylolethane, trimethylolpropane, tris(2-hydroxyethyl)isocyanurate , pentaerythritol, dipentaerythritol, etc., and further representative examples of the polybasic acid (a-3) include phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, and hymic acid. , maleic acid, fumaric acid, adipic acid, sebacic acid, dimer acid, trimellitic acid, pyromellitic acid or their acid anhydrides, as well as benzoic acid, p-tert-butylbenzoic acid, isooctanoic acid, isodecanoic acid. Alternatively, a C ₆ to _{C 18} monobasic acid (a-4) such as cyclohexanoic acid can also be used in combination. Furthermore, “Epicron 850, 1050, 3050,
4050 or 7050" [epoxy resin manufactured by Dainippon Ink and Chemicals Co., Ltd.] "Epicoat 828, 834,
1001, 1004, 1007 or 1009" (all epoxy resins manufactured by Schiel, Netherlands), or "DER660, 661J, 662, 664J, 667J, 668 or 669J" (all epoxy resins manufactured by Dow Chemical, USA) ), bisphenol-type epoxy resins such as ``Epicron 750'' or ``Unox
201 or 289” (American Union
Cycloaliphatic epoxy resin, such as epoxy resin manufactured by Carbide Corporation, "Epicron N-740 or 775"
Phenol volak type epoxy resin such as "Epicote 812" or "Epolide 40E, 200E or 400E" [epoxy resin manufactured by Kyoei Co., Ltd.], or polyethylene glycol type epoxy resin such as "BF-1000" [manufactured by Adeka Argus Chemical Co., Ltd.] Various epoxy resins (a-5) such as epoxidized polybutadiene, such as epoxy resin manufactured by Co., Ltd.
It can be used for the preparation of
[The above products are manufactured by Dainippon Ink and Chemicals Co., Ltd.], "Hital 2181 or 2300N" [The above products are manufactured by Hitachi Chemical Co., Ltd.]
Products] or various phenolic resins such as "Nicanol 70P" [all products manufactured by Mitsubishi Gas Chemical Co., Ltd.]; various products such as "Betsukasite J-896 or P-720" [all products manufactured by Dainippon Ink and Chemicals Co., Ltd.] Petroleum resin; "TSR165 or YR3168" [all silicone resins containing terminal hydroxyl groups, manufactured by Toshiba Silicone Co., Ltd.] or "SF8427 or 8428" [all silicone resins containing terminal hydroxyl groups, manufactured by Toray Silicone Co., Ltd.] , "SF8421" [epoxy group-containing silicone resin manufactured by Toray Silicone Co., Ltd.],
Or various silicone resins such as "SF8418" (carboxy-modified silicone resin manufactured by the same company);
Furthermore, nitrocellulose, cellulose acetate butyrate, cellulose acetate propionate, cellulose acetate phthalate, acetylcellulose, cellulose propionate, cellulose butyrate, methylcellulose, ethylcellulose, butylcellulose, benzylcellulose, carboxymethylcellulose, phdroxyethylcellulose, hydroxypropylcellulose Alternatively, various cellulose derivatives such as hydroxycypropyl methylcellulose can also be used for modification. Furthermore, the general formula [However, R in the formula represents a hydrogen atom or a methyl group, and _R2 represents an alkyl group consisting of _C1 to _C18 . ] Various glycidyl (meth)acrylates, including (meth)acrylic esters shown by
Methoxyethyl (meth)acrylate, methoxybutyl (meth)acrylate, diethylaminoethyl methacrylate, styrene, α-methylstyrene,
vinyltoluene, vinylpyridine, butadiene,
Aqueous solutions such as isoprene, chloroprene, (meth)acrylonitrile, or (meth)acrylic acid, itaconic acid, (meth)acrylamide, N-methylacrylamide, N-ethylacrylamide, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, acrolein such as hydrophilic or hydrophilic monomeric compounds,
So-called α, β ethylenically unsaturated monomers;
PME2000, PME4000 or 80−PME P−
4000" [polyethylene glycol monomethacrylate manufactured by Nippon Oil & Fats Co., Ltd.] or "NK-ester M-90G or M-230G" [methoxypolyethylene glycol methacrylate manufactured by Shin-Nakamura Chemical Co., Ltd.] Polyalkylene glycol (meth)acrylate monomeric compounds may also be used for modification. Therefore, in the present invention, the above-mentioned alkyd resin derivative (A) includes the above-mentioned alkyd resin, epoxy resin, phenol resin,
Typical examples include those modified with various modifying resins such as petroleum resins, silicone resins, cellulose derivatives, or acrylic resins, or with the various modifying monomeric compounds listed above. Such modification can further improve adhesion, gloss, drying properties, hardness, flexibility, etc. of the coating film, and can be expected to further improve water dispersibility. To give an example of such a modification method, α,β-ethylenically unsaturated monomer (a-
6) and 70 to 9.5 parts by weight of polyalkylene glycol (meth)acrylate (a-
An example of a method is to copolymerize 20 to 0.5 parts by weight of 7) by a conventional method. The appropriate polymerization temperature in this case is 50 to 180°C, preferably 80 to 150°C, and in such copolymerization, the alkyd resin (A) is dissolved in a water-soluble solvent. What we do from
This is desirable because the reaction can be easily controlled. Typical solvents mentioned above that can be used include ethanol, n-propanol, iso-propanol, 3-methoxy-3-methylbutanol, n-butanol, iso-butanol, sec-butanol, tert-butanol, methyl cellosolve, ethyl cellosolve, iso-butyl cellosolve,
Examples include n-butyl cellosolve, methyl carbitol, ethyl carbitol, n-propyl carbitol, or n-butyl carbitol, and polymerization initiators such as benzoyl peroxide, azobisisobutyronitrile, tert-butyl hydroxide, Di-tert-butyl oxide, cumene hydroperoxide, tert-butyl pervezoate, etc. can be used. The oil or fatty acid (a-1) described above is used in a range of 0 to 60 parts by weight, with the total amount of each of the raw materials (a-1) to (a-4) being 100 parts by weight (the same applies hereinafter). If the amount exceeds 60 parts by weight, the stability of the resulting aqueous dispersion and, ultimately, the stability of the coating material will deteriorate, which is not preferable. Next, the polyol (a-2) described above is 5 to 40
It is used in parts by weight. Further, the polybasic acid (a-3) described above is used in an amount of 10 to 50 parts by weight. Furthermore, the above-mentioned C ₆ to C ₁₈ monobasic acid (a-
4) is used in a range of 0 to 15 parts by weight. Next, each of the above-mentioned modifying resins or each modifying monomeric compound including the above-mentioned epoxy resin (a-5) is applied to the above-mentioned (a-1) to (a-
4) is used in a range of 0 to 50 parts by weight based on 100 parts by weight of the total amount of each raw material. Among these various modifying resins or various modifying monomeric compounds, epoxy resin (a-5)
When using the alkyd resin (A), it may be added together with the other raw materials (a-1) to (a-4) from the beginning when preparing the alkyd resin (A), or it may be added during the reaction. It can be either. For example, when using the silicone resin mentioned above, when preparing the alkyd resin (A), (a-
It is desirable to react together with each of the other raw materials 1) to (a-4), and when using the cellulose derivatives listed above, it is preferable to mix them directly with the alkyd resin (A) or to react them together with the other raw materials listed above. It may be dissolved in a water-soluble solvent and then mixed with the alkyd resin (A). Note that these various modifying resins or various modifying monomeric compounds may be used alone or in combination of two or more. The water-dispersible resin composition of the present invention is prepared by blending 0.05 to 20 parts by weight of the anticorrosive pigment (B) to 100 parts by weight of the alkyd resin or its derivative (A) obtained in this way and thoroughly mixing the composition. However, as the rust-preventing pigment (B), any one selected from known and commonly used pigments can be used as long as it has anti-corrosion properties. Representative examples include various chromate compounds such as basic lead chromate, zinc chromate, strontium chromate, and barium chromate; various lead-based compounds such as calcium leadate, red lead, and lead cyanamide; Various phosphate compounds such as zinc phosphate, ammonium tripolyphosphate, and zinc phosphite; Various molybdate compounds such as basic zinc molybdate and calcium molybdate; Various types such as barium metaborate, calcium metaborate, and calcium borosilicate. Borate-based compounds; mica-like iron oxide (MIO), chemical formula: MeO・Fe ₂ O ₃ (however, Me in the formula
shall represent a divalent metal atom such as Ca, Sr, Ba, Mg, Zn or Mn. ); Various basic tungstate compounds such as zinc tungstate and calcium tungstate; or chemical formula Zn-RNO ₂ (wherein R represents an alkyl group); The anticorrosive pigment (B) can be used alone or as a mixture of two or more kinds. As mentioned above, the appropriate amount of these anti-rust pigments (B) is within the range of 0.05 to 20 parts by weight; if the amount is less than 0.05 parts by weight, the rust-preventing power of the coating film will be poor. On the other hand, if it exceeds 20 parts by weight, the water resistance and moisture resistance of the coating film will deteriorate, which is not preferable. The water-dispersible resin composition of the present invention utilizes a hydrophilic functional group in the resin, that is, a hydrophilic group such as a carboxyl group, a hydroxyl group, a polyether group, or an amide bond. or by adding an emulsifier (C), or by using the hydrophilic group and adding an emulsifier (C) at the same time and dispersing it in water. When dispersing in water using the hydrophilic groups in the resin, some or all of the carboxyl groups are preliminarily removed using ammonia, triethylamine, dimethylaminoethanol, morpholine, N-methylmorpholine, 2-amino- It may be neutralized with an organic amine such as 2-methylpropanol; or an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide. Typical emulsifiers (C) mentioned above include sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alcohol ether, glycerin fatty acid ester, and propylene glycol. Fatty acid esters, polyoxyethylene castor oil derivatives, polyoxyethylene alkyl phenyl ethers, alkyl phosphates, various nonionic types such as polyoxyethylene phosphates, alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate ester salts, alkyl sulfosuccinic acid esters There are various anionic salts such as acid salts and N-acylsarcosine salts, and these may be used alone or in combination of two or more. It is desirable to use these emulsifiers by sufficiently mixing them into the resin. The type and amount of the emulsifier (C) to be used should be determined from the viewpoint of the stability of the dispersed particles and the performance of the coating film, and are not particularly limited in the present invention. The water-dispersible resin composition of the present invention thus obtained can be used as is for rust-preventing paint, or
Alternatively, it can be used in a form in which known and commonly used additive components such as pigments, plasticizers, solvents, or colorants are added, but furthermore, modified amino resins,
This does not in any way preclude the use of a wide range of water-soluble or water-dispersible resins such as epoxy resins, polyester resins, or acrylic resins. For example, it can be used as a baking paint in combination with a melamine resin, and especially when a drying oil or its fatty acid is used in the composition of the present invention, it is useful as a paint for drying at room temperature when a metal dryer is added. . These coating compositions can be applied by dipping, brushing, spraying, or rolling methods, and can be applied to ferrous and nonferrous metals as well as other surfaces such as wood, paper, plastics, or ceramics. It can also be applied to [Example] Next, the present invention will be explained in more detail with reference to Reference Examples, Examples, and Comparative Examples, where all parts and percentages are based on weight unless otherwise specified. Reference Example 1 [Preparation example of alkyd resin or its derivative (A)] Into a reaction pot equipped with a stirrer, a thermometer, and an inert gas inlet tube, 400 g of safflower oil and 180 g of pentaerythritol were charged, and lithium hydroxide was added. In addition, the mixture was heated at 260°C for 3 hours to cause a reaction. After confirming the ester conversion, 310 g of phthalic anhydride and p-tert-
110 g of butylbenzoic acid was added and reacted by heating to 210°C to obtain an alkyd resin (A) having an acid value of 10. Hereinafter, this will be abbreviated as resin (A-1). Reference Example 2 (same as above) Using the same apparatus as Reference Example 1, 350 g of linseed oil fatty acid and 400 g of "Epicron 4050" were subjected to a condensation reaction until the acid value reached 15, and then
Cool to 180℃, add 100g of phthalic anhydride and 150g of neopentyl glycol, and cool to 220℃.
The mixture was reacted for 3 hours to obtain an epoxy ester resin with an acid value of 20. Hereinafter, this will be abbreviated as resin (A-2). Reference Example 3 (same as above) Using the same apparatus as Reference Example 1, 350 g of dehydrated castor oil fatty acid and 400 g of "Epicron 4050" were added.
Condensation reaction was carried out at 200℃ until the acid value reached 15, then cooled to 180℃, and 100g of phthalic anhydride was added.
and 150g of neopentyl glycol
The reaction was carried out at 220°C for 3 hours to obtain an epoxy ester resin with an acid value of 5. Hereinafter, this resin (A
-3). Reference example 4 (same as above) Tall oil fatty acid was added to the same apparatus as in reference example 1.
450g, 193g of glycerin, 307g of phthalic anhydride
and 50g of maleic anhydride and heated to 190℃.
The mixture was heated to react to obtain an alkyd resin having an acid value of 5. Next, this resin was diluted with 519 g of ethyl cellosolve, and 50 g of "CAB551-0.01" (cellulose acetate butyrate manufactured by Eastman Kodak, USA) was added and heated to 130°C, and 100 g of styrene was added thereto. , 60 g of methyl methacrylate, 60 g of n-butyl acrylate, and 40 g of methacrylic acid were added dropwise to react with 13 g of tert-butyl perbenzoate over 3 hours. Four hours after the completion of the dropping, a viscous and transparent alkyd resin (A) was obtained. Hereinafter, this will be referred to as resin (A-4).
It is abbreviated as Reference Examples 5 to 10 (same as above) Using the same apparatus as in Reference Example 1, the respective alkyd resins and epoxy ester resins obtained in Reference Examples 1 and 3 were acrylic-modified under the conditions shown in Table 1. Various alkyd resin derivatives (A) were prepared. In addition, each compounding number in the same table shall be a weight part.

[Table] ** Polyethylene glycol monomethacrylate
*** Di-tert-butyl peroxide reference example 11 (same as above) Using the same apparatus as in reference example 1, 450 parts of tall oil fatty acid, 193 parts of glycerin, and phthalic anhydride were added.
190 by charging 307 parts and 50 parts of maleic anhydride.
The alkyd resin having an acid value of 5 was obtained by heating and reacting at ℃. Next, this resin was diluted with 519 parts of ethyl cellosolve, and 50 parts of "CAB551-0.01" (cellosolve acetate butyrate manufactured by Eastman Kodak, USA) was added and heated to 130°C. After that, 100 parts of styrene, 60 parts of methyl methacrylate, and n-butyl acrylate were added.
A mixture of 60 parts of methacrylic acid, 40 parts of methacrylic acid, and 13 parts of tert-butyl perbenzoate was added dropwise over 3 hours to cause a reaction. Four hours after the completion of the dropwise addition, a viscous and transparent vinyl-modified alkyd resin (A) was obtained. Hereinafter, this will be abbreviated as resin (A-11). Examples 1 to 11 and Comparative Examples 1 to 7 Antirust pigments were added to 100 parts of the alkyd resins and derivatives thereof obtained in Reference Examples 1 to 11 at the composition ratios shown in Tables 2 and 3. A water-dispersible resin composition for coating was prepared by adding the following. At this time, there are two methods: first adding a rust preventive pigment to the alkyd resin or its derivative and thoroughly mixing it, and then dispersing it in water (dispersion method); Two methods were used: a method of adding rust pigment (dispersion method); The dispersibility and stability of each of the water-dispersible resin compositions for coating were evaluated, and the results are summarized in Table 2. Test Examples 1 to 15 For reference, 100 parts of each of dispersion Nos. 1 to 18 shown in Tables 2 and 3,
50 copies of "100ED" [Sei no Bengara, Toda Kogyo Co., Ltd.] and "NS-200" [calcium carbonate, manufactured by Nitto Funka Co., Ltd.]
10 parts of each were mixed and kneaded and dispersed, and then 1 part of 5% cobalt naphthenate was added to each separately to prepare an air-dry red rust paint (Samples Nos. 1 to 13 and
15). Apart from this, dispersion No. shown in Table 2.
For Sample No. 10, the paint was formulated in the same manner as in Samples Nos. 1 to 13 and 15, and a portion of barium metaborate was also added to prepare a red rust paint (Sample No. 14). Various paints are applied to an untreated steel plate that has been degreased with toluene to a dry film thickness of 15 to 20 μm.
A cured coating film was obtained by drying at 25°C for 5 days. The paint stability and film performance of each paint and film were evaluated. The results are summarized in Table 4.

[Table] ** Polyethylene glycol nonyl phenol ether *** Evaluation was based on the state of the dispersion when it was left at 50°C for 3 days.

【table】

【table】

〔Effect of the invention〕

As is clear from the above results, the aqueous dispersion of the resin composition of the present invention is stable, whereas the one obtained by adding a rust preventive pigment after dispersion is inferior in stability. In addition, while the paint obtained using the resin composition of the present invention has excellent antirust ability and stability, the paint obtained by adding a rust preventive pigment after dispersion in water or when blending the paint Paints obtained by adding anti-rust pigments are less stable. As described above, the water-dispersible resin composition for coating of the present invention is extremely useful.

Claims (1)

[Claims] 1. Add 0.05 to 20 parts by weight of the anti-rust pigment (B) to 100 parts by weight of the alkyd resin or its derivative (A) and mix thoroughly, and then add the above-mentioned alkyd resin or its derivative. Using the hydrophilic groups present in (A),
and/or an emulsifier (C) and dispersed in water, the water-dispersible resin composition for coating has excellent antirust properties. 2 The alkyd resin (A) described above contains 0 to 60 parts by weight of oil or fatty acid (a-1), polyol (a-2)
5 to 40 parts by weight of polybasic acid (a-3), 10 to 50 parts by weight of polybasic acid (a-3), and 0 to 15 parts of C ₆ to C ₁₈ monobasic acid (a-4).
Parts by weight, and the above (a-1) to (a-4)
0 per 100 parts by weight of each raw material
Using ~50 parts by weight of epoxy resin (a-5), react so that the ratio of the number of hydroxyl groups/number of carboxyl groups in each of the above-mentioned raw materials (a-1) to (a-4) is 1.0 to 2.0. Claim 1 characterized in that it can be obtained at least
The composition described in Section. 3 The alkyd resin derivative (A) described above contains 0 to 60 parts by weight of oil or fatty acid (a-1), 5 to 40 parts by weight of polyol (a-2), and polybasic acid (a-3).
10 to 50 parts by weight of C ₆ to C ₁₈ monobasic acid (a-4)
0 to 15 parts by weight of, and (a-1) to
Using 0 to 15 parts by weight of epoxy resin (a-5) per 100 parts by weight of each of the raw materials (a-4), and each of the above-mentioned (a-1) to (a-4). In the presence of 10 to 90 parts by weight of an alkyd resin obtained by reacting so that the ratio of hydroxyl groups/carboxyl groups in the raw materials is 1.0 to 2.0,
Vinyl-modified alkyd obtained by copolymerizing 9.5 parts by weight of α,β-ethylenically unsaturated monomer (a-6) and 20 to 0.5 parts by weight of polyalkylene glycol (meth)acrylate (a-7) The composition according to claim 1, characterized in that it is a resin.