JPH0120194B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a new and useful acrylic coating composition, and more particularly, the present invention relates to a new and useful acrylic coating composition, and more specifically, it is made by blending a crosslinking agent component with a specific silicone monomer-containing acrylic copolymer, and has particularly good weather resistance, water repellency, and This invention relates to an acrylic coating composition with excellent stain resistance. In recent years, acrylic paints have been used in various fields due to their outstanding performance.
The performance required for this purpose is also diverse, and recently, the standards for weather resistance, water repellency, and stain resistance have become even higher in fields such as automobiles, home appliances, and building exteriors. , even higher grade than the current one.
It is hoped that the things that have been promoted will appear. However, as a result of intensive studies to obtain an acrylic paint that meets the above-mentioned requirements, the present inventors found that trialkylsiloxyalkyl (meth)acrylate and/or triphenylsiloxyalkyl (meth)acrylate was used as a vinyl monomer. We discovered that a copolymer used as one component can surprisingly improve these required performances,
The present invention has now been completed. That is, the present invention uses acrylic copolymers ()
component and a crosslinking agent () component,
This acrylic copolymer () has the general formula (A) [However, R ₁ in the formula represents a hydrogen atom or a methyl group, R ₂ represents an aryl group or an alkyl group of C ₁ to _{C 18} , and n is an integer of 1 to 3. ] 0.01 to 95% by weight of trialkylsiloxyalkyl acrylate, trialkylsiloxyalkyl methacrylate, triphenylsiloxyalkyl acrylate and/or triphenylsiloxyalkyl methacrylate, (B) hydroxyl group-containing vinyl monomer (b-1), 5 to 70% by weight of at least one vinyl monomer selected from the epoxy group-containing vinyl monomer (b-2) and the carboxyl group-containing vinyl monomer (b-3), and (C) is the above (A). and vinyl monomers other than (B) are the remaining amount, that is, these (A), (B) and
An acrylic coating composition obtained by copolymerizing these monomer mixtures in the presence of a radical generator, using the monomer mixture consisting of (C) so that the total amount is 100% by weight. This is what we provide. Here, the vinyl monomer (A) is
For example, it refers to those obtained by reacting trialkylchlorosilane or triarylchlorosilane with a hydroxyl group-containing vinyl monomer (b-1) such as those listed below in the presence of a hydrochloric acid scavenger such as triethylamine or pyridine. Typical examples include trimethylsiloxyethyl (meth)acrylate, trimethylsiloxypropyl (meth)acrylate, trimethylsiloxybutyl (meth)acrylate, triethylsiloxyethyl (meth)acrylate, tributylsiloxypropyl (meth)acrylate, or trimethylsiloxypropyl (meth)acrylate. Examples include enylsiloxyalkyl (meth)acrylate. If the amount of these vinyl monomers (A) used is less than 0.01% by weight, the effect of the monomer cannot be expected, and on the other hand, if the amount exceeds 95% by weight, the effect of the monomer can be sufficiently obtained, but crosslinking It is not preferable to have a point in the copolymer (2), which results in insufficient mechanical properties, and therefore 0.01 to 95% by weight, especially 0.1
A range of 90% by weight is suitable. In addition, the hydroxyl group-containing vinyl monomer (b-
1), hydroxyalkyl (meth)acrylates such as β-hydroxyethyl (meth)acrylate, β-hydroxypropyl (meth)acrylate or β-hydroxybutyl (meth)acrylate or N-methylolated (meth)acrylamide; Unsaturated carboxylic acids such as (meth)acrylic acid, maleic acid, fumaric acid or itaconic acid and "Cardilla E" (Siel Chemical Co., Ltd.)
Co., Ltd., glycidyl esters of branched fatty acids), monoglycidyl esters of monovalent carboxylic acids such as octylic acid glycidyl ester or coconut oil fatty acid glycidyl ester, or monoglycidyl ethers such as butyl glycidyl ether. Adducts with monoepoxy compounds; or low molecular weight polyester resins having polymerizable unsaturated bonds are typical examples, and the epoxy group-containing vinyl monomer (b-2) is glycidyl (meth). acrylate, methylglycidyl (meth)acrylate or allylglycidyl ether; "Epiclon 200, 400,
441, 850 or 1050” (Dainippon Ink & Chemicals Co., Ltd.)
epoxy resin), “Epicote 1001 or 1004”
(epoxy resin manufactured by Ciel Chemical Co., Ltd.), “Araldite
A polyepoxy compound having at least two or more epoxy groups in one molecule, such as "6071" (epoxy resin manufactured by Ciba Geigy) or "Chitsonox 221" (epoxy resin manufactured by Chitso Corporation), and (meth)
An epoxy group-containing adduct obtained by addition reaction with an unsaturated carboxylic acid such as acrylic acid, maleic acid, fumaric acid or itaconic acid in equimolar amounts; or a low molecular weight polyester having a polymerizable unsaturated bond and an epoxy group. Representative examples include resins, and examples of the carboxyl group-containing vinyl monomer (b-3) include unsaturated carboxylic acids such as (meth)acrylic acid, maleic acid, fumaric acid, and itaconic acid. It is something. These vinyl monomers (B) are important as they provide crosslinking points in the copolymer (), and if the amount used is less than 5% by weight, sufficient coating performance cannot be expected. On the other hand, if it exceeds 70% by weight, the crosslinking density becomes too high and the coating film becomes brittle, which is undesirable. Therefore, 5 to 70% by weight, particularly 10 to 60% by weight is suitable. Furthermore, typical vinyl monomers (C) include aromatic vinyl compounds such as styrene, vinyltoluene or α-methylstyrene; methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate; (meth)acrylic acid esters such as acrylate or isobutyl (meth)acrylate; diesters of maleic acid or fumaric acid with C ₁ to C ₁₈ monohydric alcohols; (meth)acrylamide or N-alkoxymethylated ( (meth)acrylamides such as meth)acrylamide, N,N-
These include dialkylaminoalkyl (meth)acrylates, phosphoric acid group-containing (meth)acrylates, and the like. The usage amount and combination of these vinyl monomers (C) are as described above for (A) and (B), respectively.
For example, when the above-mentioned hydroxyl group-containing vinyl monomer (b-1) is used as the crosslinking point-providing monomer, the amount of the crosslinking agent()
Since polyisocyanates, amino resins, etc. are used as components, phosphoric acid group-containing (meth)acrylates, N, N, etc. are used as the vinyl monomer (C).
-The use of small amounts of dialkylaminoalkyl (meth)acrylates is extremely effective in accelerating the curing reaction of the copolymer () component, that is, as an internal catalyst. Containing vinyl monomer (b-1) is also extremely effective as a similar internal catalyst when used in a small amount. For this purpose, from the viewpoint of storage stability and pigment dispersion stability, it is preferable to keep the amount of these monomers within the range of about 0.05 to 5% by weight, but usually the vinyl monomers ( The amount of C) used is the residual weight % obtained by subtracting the total weight % of each monomer (A) and monomer (B) described above from 100 weight %. In order to obtain the acrylic copolymer () constituting the composition of the present invention, the above-mentioned monomers are used in a known and commonly used method, such as a solution polymerization method using a radical generator. can be done. As the radical generator, any of those commonly used in the polymerization of acrylic monomers can be used, but representative ones include azobisisobutyronitrile and di-tert.
- butyl peroxide or benzoyl peroxide, and as solvents, aromatic hydrocarbons such as toluene or xylene; acetate esters such as ethyl acetate, butyl acetate or cellosolve acetate; methyl ethyl ketone or methyl isobutyl ketone. Ketone system;
Alcohols such as butanol or isobutanol; or cellosolves such as methyl cellosolve or ethyl cellosolve can be used. However, when using polyisocyanates having free isocyanate groups as the crosslinking agent component, for example, alcohol-based solvents should not be used because they are reactive with the isocyanate groups. In addition, if necessary, mercaptans, α-methylstyrene, “dipentene T” (Nippon Terpene Chemical Co., Ltd.)
It is also possible to use commonly used chain transfer agents such as those manufactured by Co., Ltd. The acrylic copolymer () obtained in this way has a number average molecular weight (n) within the range of 500 to 50,000, and the ratio of the number average molecular weight (n) to the weight average molecular weight (w), w/n. In the present invention, it is preferably within the range of 1.5 to 20. If n of the copolymer () is less than 500, the physical properties of the coating film may not be sufficient, and in order to obtain the physical properties of the coating film, the hydroxyl value (hereinafter referred to as (referred to as "OH value") is undesirable because it makes the coating film brittle.
On the other hand, when it exceeds 50,000, defects are likely to appear in the appearance, gloss, texture, or painting workability of the coating film, which is not preferable. On the other hand, the above-mentioned w/n represents the behavior of the molecular weight distribution, and is related to the difficulty of separating the solvent from the paint film, pigment dispersibility, and painting workability, and when this ratio is less than 1.5, the paint Although it is effective for improving workability and solvent separation, pigment dispersibility deteriorates, and conversely, when this ratio exceeds 20, it often causes problems in painting workability and solvent separation. Undesirable. Next, the crosslinking agent (), which is another component constituting the composition of the present invention, can be used in combination with each functional group in the vinyl monomer (B) described above.
Examples include the following. First, when a vinyl monomer containing a hydroxyl group is used as the vinyl monomer (B), polyisocyanates or amino resins are preferable as the crosslinking agent (). Aromatic diisocyanates such as diisocyanate, diphenylmethane diisocyanate or xylylene diisocyanate; aliphatic diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate or trimethylhexane diisocyanate; isophorone diisocyanate, methylcyclohexane-2,4-(or 2,6-) ) diisocyanate, cycloaliphatic diisocyanates such as 4,4'-methylenebis(cyclohexyl isocyanate or 1,3-di(isocyanatemethyl)-cyclohexane), and each of these diisocyanates with ethylene glycol, propylene glycol, neopentyl glycol or trimethylol. Polyhydric alcohols such as propane; extremely low molecular weight polyester resins (including oil-modified types) that have functional groups that react with isocyanate groups; or adducts with water, etc., in the form of biurets, or Polymers (including oligomers) of the above-mentioned diisocyanates, and furthermore, polymers of the above-mentioned polyisocyanates blocked with known and commonly used blocking agents such as lower monohydric alcohols or methyl ethyl ketoxime. However, from the viewpoint of the weather resistance of the coating film, it is recommended to use polyisocyanates other than aromatic diisocyanates, which do not yellow due to ultraviolet rays, or their various derivatives. The blending ratio of polyisocyanates and the acrylic copolymer () is as follows:
A range of OH/NCO=1/0.5 to 1/1.5 (equivalent ratio) is preferable from the viewpoint of coating film performance. On the other hand, typical amino resins include those made by adding formaldehyde or its equivalent substance to urea, melamine, benzoguanamine, or acetoguanamine, and then etherifying it with a C ₁ to C ₈ monohydric alcohol. However, these amino resins can be used singly or as a mixture of two or more, and if necessary, they can also be used in combination with a small amount of epoxy resin to further improve corrosion resistance and adhesion. Known and commonly used acid catalysts such as phosphoric acid can also be used as curing accelerators. The blending ratio of these amino resins and the acrylic copolymer is preferably 60 to 90% by weight of the latter copolymer to 10 to 40% by weight of the former resin. Next, when an epoxy group-containing vinyl monomer is used as the vinyl monomer (B), the crosslinking agent () is preferably a carboxyl group-containing resin or polycarboxylic acids, among which the carboxyl group-containing resin is Any material having a carboxyl group in the molecule may be used, but polyester resins (including oil-modified types), unsaturated acid-containing polymers such as acrylic acid or fumaric acid (some styrene monomers) may be used. ), epoxy resins containing two or more epoxy groups in one molecule may be reacted with excess polycarboxylic acid to leave free carboxyl groups, or rosin/maleic anhydride. Resins such as adducts are representative, but in order to provide sufficient physical properties, the resin preferably has an acid value of at least 15. On the other hand, polycarboxylic acids are the optimal crosslinking agent () component when the composition of the present invention is used as a powder coating, and representative examples of these include maleic acid, fumaric acid, succinic acid, These include adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, brassylic acid, phthalic acid, trimellitic acid, or pyromellitic acid, and among these, those with long carbon chains produce less smoke during baking. It has the advantage of Then, these carboxyl group-containing resins, polycarboxylic acids, etc. and acrylic copolymers ()
The compounding ratio with epoxy group/carboxyl group is preferably 1/0.7 to 1/1.5 (equivalent ratio). Furthermore, when a carboxyl group-containing vinyl monomer is used as the vinyl monomer (B), any crosslinking agent () may be used as long as it has at least two epoxy groups in the molecule. Among them, the most representative one is the epoxy group-containing vinyl monomer (b-
Acrylic copolymer containing 2) as an essential component (may partially contain styrene monomer),
Free epoxy groups obtained by adding an excess amount of an epoxy compound having at least two epoxy groups in the molecule to polyester resins (including oil-modified types) or polycarboxylic acids having an acid value of at least 15. Oligoepoxy ester with residual or “Epicron 1050 or
4050” (manufactured by Dainippon Ink and Chemicals Co., Ltd.), “Epicote 1001” (manufactured by Ciel Chemical Co., Ltd.), “Araldite 6071”
(manufactured by Ciba Geigy) or “Denacol EX”
-611'' (manufactured by Nagase Sangyo Co., Ltd.). The blending ratio of these epoxy group-containing acrylic copolymers, epoxy-excess oligoepoxy esters, epoxy resins, etc. and the acrylic copolymer () is carboxyl group/epoxy group = 1/0.7 to 1/1.5 ( In such a curing system, the curing time can be shortened by using a known and commonly used catalyst such as imidazole or BF ₃ complex as a curing accelerator. . The composition of the present invention thus obtained can be used as it is as a clear paint, or can be further mixed with a pigment to be used as an enamel paint. Furthermore, various commonly used additives can be mixed into the composition of the present invention, if necessary.
For example, use of cellulosic compounds such as nitrocellulose or cellulose acetate butyrate, plasticizers, or polyester resins to further increase the level of thinner resistance, dryness, texture, or flexibility. It is also possible to use paint additives such as leveling agents, ultraviolet absorbers or pigment dispersants. Furthermore, as a coating method, a commonly used method such as brush coating, spray coating, or roll coating can be adopted, and as a curing method, a wide range of methods from normal temperature drying to heat drying can be used to cure the copolymer constituting the composition of the present invention. Optimal curing conditions can be designed depending on the combination of components and crosslinking agent components. The composition of the present invention thus obtained can be used in a wide variety of applications, in the form of a solution or in the form of a powder, for precoating metals, including automobiles, home appliances, and architectural exteriors. Its effects are remarkable in fields where weather resistance, water repellency and stain resistance are required. Next, the present invention will be specifically explained with reference to Reference Examples, Examples, and Comparative Examples. In the following, all parts and percentages are based on weight unless otherwise specified. Reference Example 1 (Preparation example of hydroxyl group-containing acrylic copolymer) 500 parts of trimethylsiloxyethyl acrylate,
200 parts of a monomer mixture consisting of 185 parts of β-hydroxyethyl methacrylate, 200 parts of styrene, 65 parts of butyl methacrylate, and 50 parts of methyl methacrylate, 500 parts of toluene, 200 parts of isobutyl acetate, and azobisisobutyronitrile (AIBN). 5 parts and 10 parts of tert-butyl perbenzoate (t-BPB) were charged into a four-necked flask equipped with a stirrer, an inert gas inlet, a thermometer, and a condenser, and maintained at 90°C for 1 hour. 30
The temperature was raised to 115°C over a few minutes, and at the same temperature, 800 parts of the remaining monomer mixture, 300 parts of isobutyl acetate, and t-
3 parts of a mixture consisting of 10 parts BPB and 5 parts AIBN
It took a while to drip and was kept at the same temperature for 10 hours to obtain a non-volatile content of 49.8%, a viscosity (Gardner viscosity at 25°C; the same applies hereinafter) U, an acid value of 1.0, and an OH value.
A resin solution of 40% was obtained. Reference Example 2 (Preparation example of epoxy group-containing acrylic copolymer) 450 parts of trimethylsiloxyethyl acrylate,
Glycidyl methacrylate 300 parts, styrene 136
1000 parts of a monomer mixture consisting of 64 parts of butyl methacrylate and 50 parts of dibutyl fumarate;
500 parts of xylene, 50 parts of AIBN, 10 parts of di-tert-butyl peroxide (D-t-BPO) and tert
-40 parts of butyl peroctate (t-BPOc) was mixed in advance with 500 parts of xylene and D-
After 20 parts of t-BPO was added dropwise for 5 hours at 125℃,
Maintained at the same temperature for 10 hours, non-volatile content 50.5%, viscosity G
A resin solution with -H and an epoxy value of 0.105 was obtained. Reference Example 3 (Preparation example of carboxyl group-containing acrylic copolymer) 300 parts of xylene, 500 parts of butanol and D-t
- 10 parts of BPO was charged, and while maintained at 125°C, a monomer mixture consisting of 123 parts of methacrylic acid, 300 parts of styrene, 227 parts of butyl methacrylate, 150 parts of butyl acrylate, and 200 parts of triethylsiloxypropyl acrylate, and 200 parts of xylene,
50 copies of AIBN, 30 copies of t-BPOc and D-t-
A mixture consisting of 10 parts of BPO was added dropwise over 5 hours and kept at the same temperature for an additional 15 hours to reduce the non-volatile content to 50.0.
%, viscosity Y and acid value 40 was obtained. Reference Example 4 (Preparation example of acrylic copolymer containing hydroxyl group and epoxy group) 500 parts of toluene, 300 parts of butyl acetate and D-t
- After charging 10 parts of BPO and maintaining it at 120℃, 300 parts of tributylsiloxyethyl acrylate, 50 parts of methylglycidyl methacrylate, 93 parts of β-hydroxyethyl methacrylate, 83 parts of β-hydroxyethyl acrylate, methyl methacrylate
A monomer mixture consisting of 200 parts and 274 parts of butyl acrylate, 200 parts of toluene, 10 parts of AIBN, t
- A mixture of 30 parts of BPB and 5 parts of D-t-BPO was added dropwise over 5 hours and kept at the same temperature for an additional 15 hours to produce a resin with a nonvolatile content of 50.0%, a viscosity of Z ₁ , an OH value of 35, and an epoxy value of 0.017. A solution was obtained. Reference Example 5 (Preparation example of acrylic copolymer containing hydroxyl group and carboxyl group) Triphenylsiloxypropyl methacrylate
700 parts, β-hydroxyethyl methacrylate 185
parts, 200 parts of a monomer mixture consisting of 20 parts of methacrylic acid and 95 parts of butyl methacrylate;
After charging a mixture of 200 parts of toluene, 400 parts of butyl acetate, 5 parts of AIBN, and 5 parts of benzoyl peroxide (BPO) and keeping it at 90°C for 1 hour,
The temperature was raised to 120°C over 30 minutes, and the remaining monomer mixture was mixed with 400 parts of toluene, 10 parts of AIBN, and t-
5 parts of a mixture consisting of 20 parts of BPOc and 10 parts of BPO
Drop it over time and keep it at the same temperature for 15 hours to obtain a non-volatile content of 50.0%, viscosity V, OH value 40 and acid value 6.
A resin solution was obtained. Reference Example 6 (Preparation example of acrylic copolymer containing epoxy group and carboxyl group) 500 parts of xylene and 10 parts of D-t-BPO were charged and the temperature was raised to 120°C to prepare 58 parts of trimethylsiloxypropyl methacrylate and 300 parts of glycidyl methacrylate. , 300 parts of styrene, butyl methacrylate
150 parts, butyl acrylate 150 parts, acrylic acid 2
and 40 parts of methyl methacrylate, and 500 parts of xylene, 50 parts of AIBN, D
- A mixture of 5 parts of t-BPO and 10 parts of t-BPOc was added over 5 hours and kept at the same temperature for an additional 15 hours to obtain a nonvolatile content of 51.0%, viscosity P, and epoxy value.
A resin solution with an acid value of 0.105 and an acid value of 4 was obtained. Reference Example 7 (Preparation example of acid-excessive polyester) 104 parts of neopentyl glycol, 146 parts of adipic acid
and 134 parts of trimethylolpropane.
The temperature was raised to 160°C and then to 210°C over 3 hours. After that, the temperature was maintained at the same temperature until the acid value was 10 or less, and 444 parts of phthalic anhydride was gradually added, being careful not to generate heat, until the system became transparent and the acid value decreased.
The reaction was stopped when the temperature reached 215 to 220, and a part of the reaction product (hereinafter abbreviated as polyester (p-7)) was mixed with toluene/butanol/methyl isobutyl ketone (MIBK) = 60/20. A resin solution (hereinafter abbreviated as polyester (p'-7)) having a nonvolatile content of 50%, a viscosity Q, and an acid value of 108 was obtained by diluting with a mixed solvent of /20. The rest was taken out as is. Reference Example 8 (Example of Preparation of Epoxy Group-Terminated Polyester) Acid-excessive polyester prepared in Reference Example 7 (p-
7) Pour 400 parts and raise the temperature to 180℃, add 96 parts of "Epiclon 200" and 2 parts of 2-methylimidazole, and stop the reaction by keeping at the same temperature until the acid value becomes 5 or less. The resin solution was diluted with a mixed solvent of toluene/butanol/MIBK=60/20/20 to obtain a resin solution having a nonvolatile content of 50.0%, a viscosity U, an acid value of 3, and an epoxy value of 0.110. Reference Example 9 (Preparation example of comparative product) Except that 300 parts of isobutyl acrylate and 200 parts of isobutyl methacrylate were used instead of 500 parts of trimethylsiloxyethyl acrylate.
The same procedure as in Reference Example 1 was carried out to obtain a resin solution having a nonvolatile content of 50.9%, a viscosity W, an acid value of 1.0, and an OH value of 40. Reference Example 10 (same as above) except that 250 parts of isobutyl acrylate and 200 parts of isobutyl methacrylate were used instead of 450 parts of trimethylsiloxyethyacrylate.
A resin solution having a nonvolatile content of 49.9%, a viscosity M and an epoxy value of 0.105 was obtained in the same manner as in Reference Example 2. Reference Example 11 (Same as above) The same procedure as Reference Example 3 was carried out except that the same amount of isobutyl acrylate was used instead of triethylsiloxypropyl acrylate, and the nonvolatile content was 50.5.
%, viscosity Z and acid value 40 was obtained. Reference example 12 (same as above) 200 parts of isobutyl acrylate and 100 parts of tributylsiloxyethyl acrylate instead of 300 parts
Except for using isobutyl methacrylate in
Performed in the same manner as Reference Example 4, with a non-volatile content of 50.1% and a viscosity of
A resin solution with Z ₂ , OH value of 35, and epoxy value of 0.017 was obtained. Reference Example 13 (Same as above) The same procedure as Reference Example 5 was conducted except that 300 parts of isobutyl acrylate and 400 parts of isobutyl methacrylate were used instead of 700 parts of triphenylsiloxypropyl methacrylate.
A resin solution with a viscosity of 50.2%, a viscosity of X, an OH value of 40, and an acid value of 6 was obtained. Reference Example 14 (Same as above) The same procedure as Reference Example 6 was performed except that the same amount of isobutyl acrylate was used instead of trimethylsiloxypropyl methacrylate, and the nonvolatile content was 49.8.
%, viscosity R, epoxy value 0.105 and acid value 4 was obtained. Examples 1 to 14 and Comparative Examples 1 to 6 In order to evaluate various physical properties of the acrylic copolymer solutions obtained in each of the above reference examples, the formulations listed in Table 1 were applied to a conventional coating method. Therefore, each paint was obtained separately, and then physical property tests were conducted on each item as shown in the same table. The results are summarized in the same table.

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Claims (1)

[Claims] 1 (A) General formula [However, R ₁ in the formula represents a hydrogen atom or a methyl group, R ₂ represents an aryl group or an alkyl group of C ₁ to _{C 18} , and n is an integer of 1 to 3. ] Trialkylsiloxyalkyl acrylate, trialkylsiloxyalkyl methacrylate, triphenylsiloxyalkyl acrylate and/or triphenylsiloxyalkyl methacrylate...0.01 to 95% by weight
and (B) hydroxyl group-containing vinyl monomer (b-1), epoxy group-containing vinyl monomer (b-2), and carboxyl group-containing vinyl monomer (b-
3) At least one vinyl monomer selected from the group consisting of...5 to 70% by weight; (C) Vinyl monomers other than the above (A) and (B)...the above (A) and (B) ) and a vinyl monomer mixture consisting of 100% by weight subtracted from 100% by weight in the presence of a radical generator. An acrylic coating composition comprising a crosslinking agent () that is reactive with the functional groups contained in the acrylic paint composition.