WO2019066439A1 - Clear coat composition - Google Patents

Abstract

The present invention relates to a clear coat composition comprising a polyester-urethane copolymer, a urea-dispersed acryl resin, and an acryl polyol, and provides a clear coat composition for allowing a coating to have excellent external appearance characteristics and mechanical properties.

Description

Clearcoat composition

The present invention relates to a clearcoat composition used for coating an automobile exterior.

In the conventional painting process for automobiles, a two-part type paint using an isocyanate-based curing agent for the clear coat or a paint for imparting elasticity to the intermediate layer was used for improving the endurance chipping resistance and impact resistance of the final coat.

In this connection, in the patent document (European Patent Registration No. 152,413), a technique relating to a primer composition for an automotive paint using an epoxy-modified polyester resin and a block isocyanate curing agent is proposed, but in the above patent document, There is a problem that the efficiency of the process is deteriorated.

Therefore, development of a clearcoat composition capable of forming a coating film having excellent mechanical properties such as good coat film appearance, scratch resistance, resistance to chipping, impact and the like is not required, because a separate intermediate layer is not formed.

The present invention provides a clearcoat composition capable of forming a coating film having good appearance characteristics and excellent mechanical properties.

In order to achieve the above object, the present invention provides a clearcoat composition comprising a polyester-urethane copolymer, a urea-dispersed acrylic resin and an acrylic polyol.

The clearcoat composition of the present invention in which the polyester-urethane copolymer, the urea-dispersed acrylic resin and the acrylic polyol are mixed together as described above has not only excellent workability, but also has excellent appearance and mechanical properties There is an excellent advantage.

Hereinafter, the present invention will be described in detail.

The present invention provides a clearcoat composition.

The clearcoat composition of the present invention includes a polyester-urethane copolymer, a urea-dispersed acrylic resin, and an acrylic polyol. Each of the above components will be described in detail below.

[Polyester-urethane copolymer]

The clearcoat composition of the present invention comprises a polyester-urethane copolymer.

The polyester-urethane copolymer includes a repeating unit derived from polyester and a repeating unit derived from polyurethane as a constituent unit, and may be in the form of a random copolymer.

The repeating unit derived from the polyurethane is obtained from a unit derived from a caprolactone polyol and a unit derived from an aliphatic diisocyanate.

The caprolactone polyol is a linear polyester diol derived from caprolactone. Although not particularly limited, the caprolactone polyol may have a weight average molecular weight (Mw; g / mol) of 500 to 1,500. If the weight average molecular weight exceeds 1,500, the workability due to the high viscosity and the hardness of the coating film may be lowered. If the weight average molecular weight is less than 500, the mechanical and chemical properties may be deteriorated.

As the aliphatic diisocyanate, aliphatic or alicyclic hydrocarbon compounds having 2 isocyanate groups (-N = C = O) and 4 to 20 carbon atoms or 4 to 16 carbon atoms may be used alone or in combination of two or more. For example, at least one selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and combinations thereof, but is not limited thereto.

The repeating unit derived from the polyester is obtained from an aliphatic polyhydric alcohol and an aliphatic or alicyclic polybasic acid.

The aliphatic polyhydric alcohol can be used alone or as a mixture of two or more aliphatic compounds having 3 to 12 carbon atoms or 4 to 10 carbon atoms and having at least two hydroxyl groups (-OH). Examples thereof include propanediol, butanediol, Neopentyl glycol, trimethylol propane, and combinations thereof, but is not limited thereto.

The aliphatic or alicyclic polybasic acid may be an aliphatic polybasic acid having 3 to 12 carbon atoms, for example, 4 to 10 carbon atoms, having 2 or more carboxylic acid groups (-COOH), or an aliphatic polybasic acid having 5 to 12 carbon atoms, May be used alone or in admixture of two or more. For example, it may be at least one selected from the group consisting of hexane dicarboxylic acid, cyclohexyldicarboxylic acid, and combinations thereof. However, , But is not limited thereto.

The polyester-urethane copolymer may have a solids content of 50 to 70% by weight and a hydroxyl value of 20 to 140 mgKOH / g, for example 40 to 120 mgKOH / g, or 60 to 80 mgKOH / g. have. The acid value can also be from 1 to 20 mg KOH / g, for example from 2 to 20 mg KOH / g, or from 4 to 10 mg KOH / g. If the hydroxyl value is out of the above range, the coating film may be decomposed or the chipping resistance may be deteriorated. If the acid value is out of the above range, the overall mechanical and chemical properties of the coating film may be deteriorated due to the decrease in the weight average molecular weight.

The weight-average molecular weight (Mw) of the polyester-urethane copolymer is not particularly limited, but may be 2,000 to 6,000 in order to optimize the chipping resistance and other physical properties.

[Urea-dispersed acrylic resin]

The clearcoat composition of the present invention comprises a urea-dispersed acrylic resin.

The urea-dispersed acrylic resin may be contained in an amount of 20 to 200 parts by weight based on 100 parts by weight of the polyester-urethane copolymer. The urea-dispersed acrylic resin may be added to the clearcoat composition The urea-dispersed acrylic resin may be contained in an amount of 50 to 100 parts by weight.

The urea-dispersed acrylic resin is one in which urea particles are physically dispersed in an acrylic resin, and 1 to 10 parts by weight of urea particles are dispersed and distributed in 90 to 99 parts by weight of acrylic resin based on 100 parts by weight of solid content of urea-dispersed acrylic resin Lt; / RTI > For example, 3 to 10 parts by weight of urea particles may be dispersed and distributed in 90 to 97 parts by weight of the acrylic resin. When the urea particles are contained in an amount exceeding the above range, the flowability of the clearcoat composition is improved, but the appearance (surface texture) of the coating film may be lowered. When the urea particles are less than the above- There is a problem that the improvement of the flowability at the level can not be achieved.

By dispersing the urea particles in the acrylic resin as described above, it is possible to form a pseudo-crosslinked network structure in the paint by hydrogen bonding present in the urea particles, whereby the sagging of the composition relative to the vertical part of the coating film There is an effect to be improved. Here, flowability refers to the degree to which the composition flows when the clearcoat composition is applied and then vertically set, and the improvement in flowability means that the composition does not flow downward and the thickness remains uniform.

The acrylic resin is not particularly limited as long as urea particles can be dispersed in the acrylic resin and the appearance of the coating film using the clearcoat composition can be improved by the glass transition temperature (Tg) property. However, the glass transition temperature (Tg) of the acrylic resin may be 10 to 50 ° C or 20 to 40 ° C. If the glass transition temperature (Tg) is outside the above range, the physical properties of the coating film may be deteriorated.

At this time, the acrylic resin may be prepared by copolymerizing an ethylenic unsaturated monomer having a hydroxy group and an ethylenic unsaturated monomer having no hydroxy group.

Examples of the ethylenic unsaturated monomer having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, allyl alcohol, methacryloyl or caprolactone Examples of the ethylenic unsaturated monomer having no hydroxy group include methyl (meth) acrylate, ethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (Meth) acrylate, t-butylcyclohexyl (meth) acrylate, acrylonitrile, or methacrylonitrile.

In addition, the acrylic resin may be obtained by reacting an aromatic vinyl compound such as styrene, hydroxyalkyl methacrylate, alkyl (meth) acrylate and caprolactone.

As a specific production method, a known polymerization method such as solution radical polymerization can be used. For example, the monomer mixture and the radical polymerization initiator can be added dropwise while stirring in a solvent at a polymerization temperature of 50 to 200 DEG C for 2 to 10 hours have.

The urea particles may be obtained by reacting an aliphatic diisocyanate with an amine compound.

As the aliphatic diisocyanate, aliphatic or alicyclic hydrocarbon compounds having two isocyanate groups and having 4 to 20 carbon atoms, for example, 4 to 16 carbon atoms may be used alone or in combination of two or more. For example, hexamethylene di Isocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and combinations thereof.

The amine compound may be at least one selected from the group consisting of, for example, benzylamine, methylbenzylamine, ethylbenzylamine, methyl aniline, ethyl aniline, diphenylamine and naphthalamine.

The amine compound may be a primary amine such as ethanolamine, methoxypropylamine, 3,4-dimethoxyphenylethylbutylamine, hexylamine, octylamine, decylamine or stearylamine.

The urea-dispersed acrylic resin may have a hydroxyl value of 100 to 200 mgKOH / g and a glass transition temperature (Tg) of 10 to 50 ° C. If the hydroxyl value is less than 100 mgKOH / g, the crosslinking property of the coating film may be deteriorated. On the other hand, if the hydroxyl value is more than 200 mgKOH / g, the water resistance of the coating film may be deteriorated.

The polyester-urethane copolymer and the urea-dispersed acrylic resin may be contained in a weight ratio of 1: 0.2 to 1: 2. For example, from 1: 0.2 to 1: 1, and may also be included in a weight ratio of 1: 0.6 to 1: 1. When the weight ratio of the polyester-urethane copolymer to the urea-dispersed acrylic resin is less than 1: 0.2, the appearance and flowability are deteriorated due to sagging deterioration. When the weight ratio of the polyester-urethane copolymer and the urea-dispersed acrylic resin is less than 1: Can be degraded.

[Acrylic polyol]

The clearcoat composition of the present invention comprises an acrylic polyol.

The acrylic polyol may be an acrylic polyol resin.

The acrylic polyol may be contained in an amount of 80 to 500 parts by weight based on 100 parts by weight of the polyester-urethane copolymer. In addition to hardness, water resistance and weather resistance of the final coating film, physical properties such as impact resistance and chipping resistance Based on the total weight of the composition.

The acrylic polyol may have a hydroxyl value of 50 to 150 mgKOH / g, a glass transition temperature (Tg) of 0 to 50 ° C, and a solid content of 45 to 75% by weight. The hydroxyl value of the acrylic polyol is closely related to the crosslinking density of the coating film, which affects weatherability and hardness, and when the hydroxyl value is out of the range, the weatherability and hardness of the coating film may be lowered.

The polyester-urethane copolymer and the acrylic polyol may be contained in a weight ratio of 1: 0.8 to 1: 5. For example, in a weight ratio of 1: 1 to 1: 3, and may also be contained in a weight ratio of 1: 1.4 to 1: 2.5. If the weight ratio of the polyester-urethane copolymer to the acrylic polyol is less than 1: 0.8, the hardness may be lowered and the gloss may be lowered. If the weight ratio is more than 1: 5, the hardness of the coating film becomes too hard, .

In addition, the acrylic polyol may be obtained by reacting an aromatic vinyl compound such as styrene, hydroxyalkyl methacrylate, alkyl (meth) acrylate and caprolactone.

As a specific production method, a known polymerization method such as solution radical polymerization can be used. For example, the monomer mixture and the radical polymerization initiator can be added dropwise while stirring in a solvent at a polymerization temperature of 50 to 200 DEG C for 2 to 10 hours have.

[Other ingredients]

The clearcoat composition of the present invention may contain a curing agent. The type of the curing agent is not particularly limited, but examples thereof include hexamethylol melamine, hexamethoxymethylmelamine, hexabutoxymethylmelamine, hexamethoxybutoxymethylmelamine, Nymethoxy methyl melamine, and combinations thereof.

In this case, the curing agent may be added in an amount of 5 to 30 parts by weight, for example, 10 to 25 parts by weight, or 15 to 20 parts by weight based on 100 parts by weight of the total amount of the clear coat composition.

If the curing agent is contained in an amount of less than 5 parts by weight, the coating may be backed off and the hardness and water resistance may be deteriorated. When the curing agent is more than 30 parts by weight, the coating film may become hardened and the impact resistance and chipping resistance may be deteriorated.

In addition, the clear coat composition of the present invention may further include a curing catalyst for promoting curing. The curing catalyst is not particularly limited, and examples thereof include dodecylbenzenesulfonic acid, sulfonic acid, dinonylnaphthalene disulfonic acid, dinonylnaphthalenesulfonic acid, Para-toluenesulfonic acid, and combinations thereof.

In this case, the curing catalyst may be used in an amount of 0.5 to 3 parts by weight, for example, 1 to 2.5 parts by weight, or 1.3 to 2 parts by weight based on 100 parts by weight of the total amount of the clearcoat composition.

If the curing catalyst is contained in an amount of less than 0.5 parts by weight, the crosslinking density may be lowered due to the lowering of the curing rate, and the hardness, water resistance and solvent resistance of the coating film may be lowered. Resulting in a problem that the impact resistance, the chipping resistance and the reattachment adherence deteriorate.

Meanwhile, the clear coat composition of the present invention may further include at least one selected from the group consisting of a leveling agent, a light stabilizer, a storage stability improving agent, and a combination thereof in addition to the above-mentioned curing agent, curing catalyst or organic solvent.

According to another aspect of the present invention, there is provided a molded article comprising at least one coating layer formed from the clear coat composition, wherein the molded article may be a metal or a non-metallic material, for example, an automobile part.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, these examples are intended to further illustrate the present invention, and the scope of the present invention is not limited thereto.

[Example]

[Synthesis Example 1-1] Preparation of polyester-urethane copolymer 1

A thermometer and a stirrer, 7 g of butanediol, 7 g of neopentyl glycol, 4 g of trimethylolpropane, 12 g of cyclohexyldicarboxylic acid and 7 g of hexanedicarboxylic acid were added in this order, and then nitrogen gas The temperature was gradually raised to 210 DEG C while being supplied. After the temperature was elevated, the reaction product was maintained until the solid raw material was completely dissolved and kept in a transparent state. When the temperature of the upper portion of the column was lowered, the xylene was subjected to a refluxing reaction and cooled to an acid value of 10 mgKOH / g or less. Diluted to 24 g. After the intermediate polyester resin was prepared, 20 g of caprolactone polyol, 5 g of hexamethylene diisocyanate and 15 g of propylene glycol monomethyl ether acetate were added at 80 占 폚 or lower, and the reaction was carried out at 100 占 폚. When the content of isocyanate reached '0' as the reaction proceeded, the reaction was terminated. The acid value of the synthesized polyester-urethane copolymer was 5 mgKOH / g, the hydroxyl value was 77 mgKOH / g, and the weight average molecular weight was 5,000.

[Synthesis Example 1-2] Preparation of polyester-urethane copolymer 2

10 g of butanediol, 7 g of neopentyl glycol, 4 g of trimethylolpropane, 11 g of cyclohexyldicarboxylic acid and 6 g of hexanedicarboxylic acid were added in this order to a synthetic four-necked flask equipped with a stirrer, a thermometer and a stirrer, The temperature was gradually raised to 210 DEG C while being supplied. After the temperature was elevated, the reaction product was maintained until the solid raw material was completely dissolved and kept in a transparent state. When the temperature of the upper portion of the column was lowered, the xylene was subjected to a refluxing reaction and cooled at an acid value of 40 mgKOH / g or less. ≪ / RTI > After preparing an intermediate polyester resin, 20 g of caprolactone polyol, 3 g of hexamethylene diisocyanate and 15 g of propylene glycol monomethyl ether acetate were added at 80 캜 or lower, and the reaction was carried out at 100 캜. When the content of isocyanate reached '0' as the reaction proceeded, the reaction was terminated. The acid value of the synthesized polyester-urethane copolymer was 30 mgKOH / g, the hydroxyl value was 150 mgKOH / g, and the weight average molecular weight was 7,000.

[Synthesis Example 2-1] Production of urea-dispersed acrylic resin 1

A synthetic four-necked flask equipped with a thermometer and a stirrer was charged with 70 g of acrylic polyol, 10 g of butyl acetate, 1.6 g of benzylamine, 1.4 g of hexamethylene diisocyanate, and 17 g of cocosol # 100, and the mixture was stirred at 100 rpm do. In this case, the appearance of the coating film may be lowered due to the competitive reaction of acrylic resin, diisocyanate, amine compound, etc. Therefore, nitrogen is injected into the system for suppressing the side reaction, and at the same time, So that the reaction takes place. The temperature rose to 15 ± 2 ℃ due to heat generation. The acrylic polyol used herein had a long chain structure having a hydroxyl group group in the main chain, a hydroxyl value of 140 mgKOH / g and a glass transition temperature (Tg) of 30 ° C.

[Synthesis Example 2-2] Preparation of urea-dispersed acrylic resin 2

70 g of acrylic polyol, 10 g of butyl acetate, 0.8 g of benzylamine, 0.7 g of hexamethylene diisocyanate and 18.5 g of cocosol # 100 were put into a four-necked flask for synthesis equipped with a stirrer, a thermometer and a stirrer, . In this case, since the appearance of the coating film may be degraded due to the competitive reaction of acrylic resin, diisocyanate, and amine compound, nitrogen is injected into the system for suppressing the side reaction and reaction occurs at 10 ± 2 ° C using cold water . The temperature rose to 15 ± 2 ℃ due to heat generation. The acrylic polyol used herein had a long chain structure having a hydroxyl group group in the main chain, a hydroxyl value of 140 mgKOH / g and a glass transition temperature (Tg) of 30 ° C.

[Synthesis Example 3] Synthesis of acrylic polyol

19 g of styrene, 34 g of n-butyl methacrylate, 28 g of hydroxyethyl methacrylate and 20 g of 2-oxepanone homopolymer and 20 g of 2- [(2-methyl-1-oxo-2-propenyl) Was added with a peroxide type initiator at a temperature of 140 to 160 ° C to prepare an acrylic polyol through a copolymerization reaction.

[Examples 1 to 3 and Comparative Examples 1 to 7]

The urethane-urethane copolymer prepared in Synthesis Example [1-1] and Synthesis Example [1-2], urea-dispersed acrylic resin prepared in Synthesis Example [2-1] and Synthesis Example [2-2] The acrylic polyols prepared in Synthesis Example 3 were mixed in the compositions shown in the following Table 1, and the final viscosity was adjusted to 35 seconds with Forod Cup # 4 to prepare clearcoat compositions for automobiles. Specifically, a polyester-urethane copolymer, a urea-dispersed acrylic resin, an acrylic polyol and a solvent are stirred at 600 to 800 rpm using a dissolver, and a curing agent, a curing catalyst, a light stabilizer, The clearcoat composition was prepared by stirring at the same rate for 30 minutes.

Next, a specimen coated with the electrodeposition paint in advance was coated with a middle coat, cured at 140 ° C for 20 minutes (film thickness 30 to 40 microns), and then a water-based automotive coating material 1 The base coat (dry film thickness: 12 to 16 microns) and the second base coat (dry film thickness: 10 to 20 microns) were bell coated, and hot air was blown at 80 DEG C for 5 minutes to evaporate the water remaining in the paint . The clearcoat compositions prepared in Examples and Comparative Examples were respectively coated thereon and cured in a general oven at 140 DEG C for 25 minutes to form a final coating film.

ingredient	Example			Comparative Example
	One	2	3	One	2	3	4	5	6	7
Polyester-urethane Copolymer 1	15	20	15	30	15	-	30	23	20	-
Polyester-urethane Copolymer 2	-	-	-	-	-	20	-	-	-	-
Urea-dispersed acrylic resin 1	10	15	15	25	-	15	-	10	-	25
Urea-dispersed acrylic resin 2	-	-	-	-	-	-	-	-	15	-
Acrylic polyol	39	29	34	9	49	29	34	31	29	39
Hardener	16	16	16	16	16	16	16	16	16	16
Curing catalyst	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
Leveling agent	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Light stabilizer 1	One	One	One	One	One	One	One	One	One	One
Light stabilizer 2	One	One	One	One	One	One	One	One	One	One
Aromatic # 100 (solvent)	11	11	11	11	11	11	11	11	11	11
Butyl alcohol (solvent)	5	5	5	5	5	5	5	5	5	5
sub Total	100	100	100	100	100	100	100	100	100	100

1. Acrylic polyol: An acrylic polyol resin (KCC) having a solid content of 70% by weight, a weight average molecular weight (Mw) of 8,000, a hydroxyl value of 120 mgKOH / g and a glass transition temperature (Tg)

2. Hardener: Alkylated melamine resin (cymel 1168, Cytec)

3. Curing catalyst: acid catalyst of dodecylbenzenesulfonic acid type (NACURE 5225, King Industries)

4. Leveling agent: silicone leveling agent (BYK-331, BYK)

5. Light stabilizer 1: benzotriazole series (Tinuvin 384, BASF)

6. Light stabilizer 2: Hinderd Amine Light Stabilizer (Tinuvin 292, BASF)

7. Aromatic # 100 (solvent): Kocosol # 100, (CAS No. 64742-95-6, KE-31662, SK General Chemical)

The appearance and physical properties of the final coating film were measured by the following methods, and the results are shown in Table 2.

Physical Properties	Example			Comparative Example
	One	2	3	One	2	3	4	5	6	7
Exterior	◎	◎	○	◎	△	△	△	○	△	○
Attachment	◎	◎	◎	◎	◎	○	◎	△	○	◎
Scratchiness	◎	◎	◎	◎	◎	○	○	◎	◎	△
My clan	◎	◎	◎	○	○	△	△	◎	◎	△
Hardness	◎	○	◎	△	○	◎	△	△	○	△
Impact	◎	◎	◎	△	○	○	○	◎	○	△
Water resistance	◎	○	◎	△	△	◎	△	◎	◎	△
Flowability	◎	◎	○	◎	△	△	△	○	△	◎
* Evaluation: ◎ - Excellent, ○ - Good, △ - Medium, X - Bad

(1) Appearance: Measurement of the CF value of the final coating film by applying Wave Scan DOI (BYK Gardner) which is an automobile appearance measuring instrument. The results of the measurement are judged to be ⊚ - excellent (CF 65 or more), good (CF 60 to less than 65), Δ - normal (CF 55 to less than 60) and X-defect (less than CF 55).

(2) Adhesion: 2 mm Cross-cut After making 100 pieces, it was peeled off using a scotch tape. When there was no problem, it was judged as " good & ".

(3) Scratch resistance: A method of measuring resistance to scratching of a finished film using AMTEC-KISTER in an automobile, measuring the gloss of the coating film at 20 degrees before and after the test, ) And then evaluating it (the higher it is more advantageous). When the gloss retention ratio (%) is 70% or more, ⊚ - Excellent, when 60% or more is less than 70% - Good - When 55% or more is less than 60% .

(4) Chipping resistance: After leaving at -20 ° C for 3 hours, 50 g of chipping stone is used to push out 50 g of chipping stone at a pressure of 5 bar. "Good" when less than 1 mm of damage is less than 10, "Good" when less than 10 damage of less than 1 mm and less than 2 mm, 10 (X) when the size is more than 2 mm and less than 3 mm is 10 or more.

(5) Hardness: Measured by the pencil hardness method (hardness measurement not to damage the coating film with each pencil of 3B, 2B, B, HB, F, H, 2H and 3H). The measurement results are shown as ⊚-excellent (HB or more), ∘-good (B), △ -ormal (2B), and X-poor (3B or less).

(6) Impact resistance: No cracks or peeling in the coating when dropped from a height of more than 50 cm using a weight of 500 g. "Good" when there is no coating crack at 50 cm or more, "Good" at 40 cm or more at 50 cm or less, or "30 cm or more at 40 cm or less" Normal (△) ", and when cracks occur at less than 30 cm," Bad (X) "is judged.

(7) Water resistance: Adhesion test and discoloration evaluation after immersing the coated film in a constant temperature bath at 40 ° C for 10 days. When adhesion is good and there is no discoloration, it is evaluated as "good (⊚)" and good adhesion, but "normal (△)" when recovering after discoloration.

(8) Flowability: Perform a medium and clear gradient coating on a steel plate (preprocessing, electrodeposition coating) with a hole diameter of 5 mm and observe the coating on the bottom of the hole. Completion of the starting point where flow generation is observed Record the film thickness after the film thickness as the flow limit film thickness (the lower the value is, the poorer).

Claims (6)

1. Polyester-urethane copolymers,

   Urea-dispersed acrylic resin and

   A clearcoat composition comprising an acrylic polyol.
2. The method according to claim 1,

   Based on 100 parts by weight of the polyester-urethane copolymer,

   20 to 200 parts by weight of the urea-dispersed acrylic resin and 80 to 500 parts by weight of the acrylic polyol.
3. The method according to claim 1,

   Wherein the polyester-urethane copolymer has an acid value of 1 to 20 mgKOH / g, a hydroxyl value of 20 to 140 mgKOH / g, and a weight average molecular weight (Mw) of 2,000 to 6,000.
4. The method according to claim 1,

   Wherein the urea-dispersed acrylic resin has a hydroxyl value of 100 to 200 mgKOH / g and a glass transition temperature (Tg) of 10 to 50 ° C.
5. The method according to claim 1,

   Wherein the acrylic polyol has a hydroxyl value of 50 to 150 mgKOH / g, a glass transition temperature (Tg) of 0 to 50 ° C, and a solid content of 45 to 75% by weight.
6. A molded article comprising at least one coating layer formed from the clearcoat composition of claim 1.