JP4155697B2 - Matte coating composition for polyolefin moldings - Google Patents

Description

【００５４】
（III）塗装
上記艶消し塗料を塗膜厚さが約20〜30μmとなるようポリオレフィン系成型品に塗装し、80℃にて30分間乾燥した。
【００５５】
（IV）性能評価
（付着性）
上記条件にて作成した試験片を48時間放置後、碁盤目テープ剥離試験を実施し、塗膜の剥がれを評価する。また、試験片を温水（40℃）中に196時間放置した後、碁盤目テープ剥離試験を実施し、塗膜の剥がれを評価した。
【００５６】
【表２】

【００５７】
（耐薬品摩耗性）
幅約30mm、長さ200mmの試験片をとり、HSL0849に規定される摩擦試験機II型の試験台に取り付け、表３の薬品に浸積した白綿布（カナキン3号）を摩耗子の接触面にかぶせて固定し、摩耗子の荷重を2N（200ｇf）として試験片上100mmの間を毎分30回往復する速さで往復摩擦し、白綿布汚染及び材料の摩耗の程度を外観目視判定した。結果を表３に表示する。
【００５８】
【表３】

【００５９】
（エアバッグ作動テスト）
エアバッグカバーに於ける本発明の塗料による塗装品を、初期状態で-35℃〜85℃にてエアバッグ作動テストをし、塗膜状態を評価した。また、熱老化後（110℃，1000時間）、オゾン劣化後（50pphm，40℃，200時間）、湿劣化後（50℃，95％RH，1000時間）、冷熱サイクル後（-30℃（冷却），50℃，95％RH（温熱），80℃（加熱）を24時間で1サイクル実施し、50サイクル）の各老化テスト後の塗装品を-35℃〜85℃にてエアバッグ作動テストをしたところ、実施例１〜８のすべてについて、初期状態、各劣化試験後とも設定されたテア部が破断し、開口フラップ部が回動しても、塗料が剥がれたり、割れて飛散しないことが確認できた。
【００６０】
【発明の効果】
以上詳述したように、本発明のポリオレフィン系成型品用艶消し塗料組成物は、１コートでもポリオレフィン系成型品へ強固に密着し、エアバッグ作動時のカバー材の飛散を防止できる。また、得られる塗膜は表面に高級な艶消し感（奥行き感、スエード感）を与えるとともに、当該艶消し状態を長期間保持できるため、エアバッグカバー等の特殊な環境下（低温度領域）で作動するポリオレフィン系成型品の表面塗装に好適に使用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention is a coating composition that can be suitably used for automobile interior parts, and particularly for small covers that operate in a special environment (low temperature range) such as an air bag cover, a polyolefin-based molded product even without a primer. In addition, the present invention relates to a coating composition that provides a high-quality matte feeling with excellent wear resistance.
[0002]
[Prior art and problems to be solved by the invention]
Automotive interior parts made of polyolefin resin, such as airbag covers, are matte painted to give a high-class feel. However, polyolefin resin does not have a functional group that binds to the coating resin, so even if it is applied directly, it has poor adhesion, resulting from coating cracking due to aging and coating cracking during low-temperature airbag operation. At present, the cover material is scattered. For this reason, two-coat coating, in which a primer such as chlorinated polypropylene is applied in advance before applying the paint, is very complicated and time-consuming to manufacture, and is expensive in terms of cost. Therefore, there is a demand for a one-coat type coating composition that can prevent the coating film from changing with time even without a primer.
[0003]
When the surface is matted, inorganic fine powders such as silica, silicon earth, alumina, calcium carbonate, magnesium carbonate, acrylic resin and organic fine powders such as acrylic resin fine powder are used for the paint. Since the fine powder does not have a functional group that can be integrated with the binder resin and is merely held in a mechanically bonded state, it has poor high-quality feeling and soft touch. In addition, there are disadvantages such as the matte fine powder falling off due to frictional wear on the painted surface and increasing gloss.
[0004]
The present invention has been made to solve such a problem, and even with a single coat firmly adhered to a polyolefin-based molded product, prevents scattering of the cover material when the airbag is activated, and has a high-quality texture on the surface ( An object of the present invention is to provide a matte coating composition for polyolefin-based molded articles that gives a sense of depth and suede.
[0005]
[Means for Solving the Invention]
As a result of intensive studies to achieve the above object, the present inventors have
(A) at least (a-1) an acrylic graft polyester resin having a glass transition point of −60 to −30 ° C. and (a-2) a binder resin comprising a chlorinated polyolefin graft acrylic resin having a glass transition point of 30 to 60 ° C. ,
(B) a hydroxyl group-containing polyurethane resin fine powder,
(C) By using a matte coating composition for a polyolefin-based molded article containing a polyisocyanate compound having two or more isocyanate groups at the terminal, it adheres to the polyolefin-based molded article in one coat and has a high-quality texture on the surface. The present inventors have found that a coating film that gives (feeling of depth, feeling of suede) and prevents scattering of the cover material when the airbag is actuated can be obtained.
[0006]
That is, the matte coating composition for polyolefin-based molded products of the present invention is characterized in that (A) two types of resins having different glass transition points are used in combination as a binder resin. As a result, it is possible to obtain a coating film that adheres to the polyolefin-based molded product with one coat and does not scatter even when the airbag is activated.
[0007]
In the present invention, it is preferable that the (B) hydroxyl group-containing polyurethane resin fine powder used as a matting agent has a hydroxyl value of 100 to 250. Prior to its use, (C) the polyisocyanate compound is added to the coating composition of the present invention. The hydroxyl group of the polyurethane resin fine powder reacts with the isocyanate group to form a strong and integral coating film together with the binder resin. Therefore, the obtained coating film does not change with time over a long period of time.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the matte coating composition for polyolefin-based molded articles of the present invention will be described in detail.
[0009]
[I] Matte coating composition for polyolefin moldings The matting coating composition for polyolefin moldings of the present invention comprises:
(A) a binder resin,
(B) a hydroxyl group-containing polyurethane resin fine powder;
(C) a polyisocyanate compound having two or more isocyanate groups at the terminal.
[0010]
Hereinafter, each component of the matte coating composition for polyolefin-based molded article of the present invention will be described in detail.
[0011]
(A) Binder resin The binder resin used in the present invention is a mixture of at least two types of graft polymerization resins having different glass transition points, and at least one of them is (a-1) having a glass transition point of −60 to An acrylic graft polyester resin at -30 ° C is used, and the other is (a-2) a chlorinated polyolefin graft acrylic resin having a glass transition point of 30-60 ° C.
[0012]
By using the graft polymerization resin in combination, it is possible to obtain a coating film that adheres to the polyolefin-based molded product in one coat and does not scatter even when the airbag is activated. Hereinafter, (a-1) and (a-2), which are essential components of the binder resin, will be described in detail.
[0013]
(a-1) Acrylic graft polyester resin
(a-1) is a polyester resin obtained by graft polymerization of an acrylic resin component, and the acrylic resin component is preferably 10 to 30%. If the acrylic resin component is 10% or less, the solvent resistance may be poor, and if it is 30% or more, the flexibility may be lowered.
[0014]
In order to obtain an acrylic graft polyester resin in the present invention, an acrylic monomer is mixed in an amount of 10 to 45 parts by weight with respect to 100 parts by weight of the polyester resin, and a polymerization initiator such as azobisisobutyronitrile or benzoyl peroxide, Preferably, in order to allow the grafting to proceed efficiently, the reaction may be carried out by heating for about 1 to 10 hours in the range of about 60 to 150 ° C. in the presence of a peroxide polymerization initiator such as benzoyl peroxide.
[0015]
The polyester resin is obtained by polycondensation (esterification) of a polyhydric alcohol and a polybasic acid or an anhydride thereof. Polyhydric alcohols include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, neopentyl glycol, butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexane Dimethanol, 2,2-dimethyl-3-hydroxypropyl-2,2-dimethyl-3-hydroxypropionate, 2,2,4-trimethyl-1,3-pentanediol, polytetramethylene ether glycol, polycaprolactone Polyols, glycerin, sorbitol, anisole, trimethylolpropane, trimethylolbutane, hexanetriol, pentaerythritol, dipentaerythritol, and their multimers (dimers, octamers, etc.) and the like. It can be used in combination Le two or more. Polybasic acid or its anhydride includes phthalic acid, phthalic anhydride, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, methyltetrahydrophthalic acid, methyltetrahydrophthalic anhydride, hymic anhydride , Trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, isophthalic acid, terephthalic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, adipic acid, azelaic acid, sebacic acid, succinic acid, succinic anhydride, Examples include dodecenyl succinic acid and dodecenyl succinic anhydride, and two or more of these can be used in combination.
[0016]
As an acrylic monomer, for example,
(1) ethylenic monomer having a hydroxyl group such as hydroxymethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, N-methylolacrylamine,
(2) ethylenic monomers having a carboxyl group such as acrylic acid, methacrylic acid (MAA), crotonic acid, itaconic acid, fumaric acid, maleic acid, and the like, and
(3) Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl acrylate, isopropyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, lauryl (meth) acrylate, acrylic Examples include compounds such as alkyl (meth) acrylates such as n-octyl acid and n-dodecyl acrylate. In addition, ethylenic monomers such as styrene and (meth) acrylonitrile that can be copolymerized with these monomers can be used in combination.
[0017]
The acrylic graft polyester resin preferably has a glass transition point of -60 to -30 ° C. When the glass transition point is −60 ° C. or lower, the curability is poor, and when it is −30 ° C. or higher, the coating film is hard and easily broken.
[0018]
The acrylic graft polyester resin preferably has a molecular weight of 15,000 to 45,000. When the molecular weight is 15,000 or less, the oil and fat contamination is poor, and the formed coating film may be brittle, and when it is 45,000 or more, the flexibility may decrease, which is not preferable.
[0019]
The acrylic graft polyester resin preferably has a hydroxyl value of 2 to 15. When the hydroxyl value is 2 or less, fat and oil contamination is poor, while when the hydroxyl value is 15 or more, the water resistance decreases, which is not preferable.
[0020]
(a-2) Chlorinated polyolefin graft acrylic resin
(a-2) is an acrylic resin obtained by graft polymerization of chlorinated polyolefin, and plays a role as a binder with a polyolefin-based molded product. For this reason, the coating composition which adhere | attaches firmly on a polyolefin-type molded article even with 1 coat is obtained.
[0021]
The chlorinated polyolefin graft acrylic resin preferably contains 10 to 30% of the chlorinated polyolefin component. If the chlorinated polyolefin component is 10% or less, the adhesion to the polyolefin molded product is lowered and the flexibility is poor, and if it is 30% or more, the solvent resistance is poor and the formed coating film is brittle. This is not preferable.
[0022]
The chlorinated polyolefin graft acrylic resin used in the present invention is obtained by reacting a chlorinated polyolefin with at least one of the ethylenic monomers listed in (1) to (3) of (a-1) by a usual method. Can be obtained. In addition to the ethylenic monomers, ethylenic monomers such as styrene and (meth) acrylonitrile that can be copolymerized with these monomers can be used in combination.
[0023]
As an example of a preferred synthesis method, 100 parts by weight of a 25% toluene solution of chlorinated polyolefin (Hardylene 14LLB: manufactured by Toyo Kasei Kogyo Co., Ltd.) is heated to 95 ° C., 49 parts of methyl methacrylate, 15 parts of iso-butyl methacrylate A mixed solution of 5 parts of styrene, 5 parts of styrene, 5 parts of β-hydroxypropyl methacrylate, 1 part of methacrylic acid, 1 part of benzoyl peroxide and 2.2 parts of azobisisobutyronitrile was added dropwise for 3 hours, and azo was added after 1 hour and 2 hours. Add bisisobutyronitrile, respectively.
[0024]
The chlorinated polyolefin graft acrylic resin used in the present invention preferably has a glass transition point of 30 to 60 ° C. When the glass transition point is 30 ° C. or lower, the adhesion is poor, and when it is 60 ° C. or higher, it is not preferable because it is hard and easily broken.
[0025]
The chlorinated polyolefin graft acrylic resin preferably has a molecular weight of 30,000 to 45,000. When the molecular weight is 30,000 or less, the solvent resistance may be inferior, and when it is 45,000 or more, the flexibility may be lowered.
[0026]
(a-3) Binder resin mixing ratio
The mixing ratio of (a-1) acrylic grafted polyester resin and (a-2) chlorinated polyolefin grafted acrylic resin is preferably 20:80 to 60:40 by weight. When the chlorinated polyolefin graft acrylic resin is less than 40%, the coating film becomes soft and the coating film strength decreases. On the other hand, when it exceeds 80%, the formed coating film is poor in flexibility, and there is a possibility that the coating film cracks and is scattered when the airbag cover or the like is operated at a low temperature.
[0027]
Any binder resin other than (a-1) and (a-2) may be used in combination as long as the physical properties of the coating film are not significantly impaired. In this case, the mixing ratio of the other binder resin is 50% (weight ratio) or less with respect to the entire binder resin.
[0028]
(B) Hydroxyl group-containing polyurethane resin fine powder In the present invention, the hydroxyl group-containing polyurethane resin fine powder has a role as a matting agent. The hydroxyl group-containing polyurethane resin fine powder preferably has a hydroxyl value of 100 to 250. Since the hydroxyl group is urethane-bonded to the (C) polyisocyanate compound, which is a curing agent, the polyurethane resin fine powder becomes a strong integral coating film together with the binder resin, so that the matte fine powder agent is less likely to fall off, and for a long time. And a good matte state is maintained.
[0029]
When the hydroxyl value of the polyurethane resin fine powder is 100 or less, the bonding force due to the functional group is small and the frictional wear resistance is lowered, which is not preferable. Moreover, when the hydroxyl value is 250 or more, the adhesiveness of the resin is increased, and the feel is uncomfortable. More preferably, the hydroxyl value is 150 to 200.
[0030]
Further, the hydroxyl group-containing polyurethane resin fine powder preferably has a glass transition point (Tg) of 0 to 30 ° C. When Tg is 0 ° C. or lower, chemical resistance is poor, and when it is 30 ° C. or higher, the coating film is hard and easily broken, which is not preferable.
[0031]
The hydroxyl group-containing polyurethane resin fine powder preferably has an average particle size of 10 to 100 μm, and more preferably 20 to 70 μm. When the average particle size is 10 μm or less, a sufficient matte feeling cannot be obtained, and when the average particle size is 100 μm or less, the smoothness of the coating film is lowered, which is not preferable.
[0032]
Next, a method for producing such a hydroxyl group-containing polyurethane powder will be described. First, at least one aliphatic dibasic acid and at least one aliphatic dihydric alcohol are reacted to form a polyester polyol having a molecular weight of about 500 to 3000. Examples of the aliphatic dibasic acid include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, corkic acid, azelaic acid, sebacic acid and the like. Examples of the aliphatic dihydric alcohol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and hexanediol.
[0033]
Next, a polyester urethane resin having a molecular weight of about 4,000 to 40,000 is synthesized by subjecting the polyester polyol to a chain extension reaction using at least one of the above-mentioned aliphatic dihydric alcohols and at least one of the diisocyanate compounds. Examples of the diisocyanate compound include xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and tolylene diisocyanate.
[0034]
Next, using a three-necked flask having a stirrer, a reflux condenser, and a dropping funnel, the polyester urethane resin and the dispersion aid are heated to about 70 to 90 ° C. together with a dispersion medium while stirring, thereby producing a polyester. Disperse the urethane resin and dissolve the dispersion aid. Furthermore, a polyisocyanate, a reaction catalyst and a curing accelerator are added and reacted for 1 to 4 hours while maintaining at 70 to 90 ° C. As a result, a suspension of the hydroxyl group-containing polyurethane resin fine powder having a particle size of 10 to 100 μm is obtained.
[0035]
In this case, examples of usable polyisocyanates include aliphatic polyisocyanates such as hexamethylene diisocyanate (HMDI), alicyclic polyisocyanates such as isophorone diisocyanate (IPDI), hydrogenated diphenyl diisocyanate, and diphenylmethane-4,4′-. And aromatic polyisocyanates such as diisocyanate (MDI) and hydrogenated MDI.
[0036]
(C) Polyisocyanate Compound The coating composition of the present invention is a two-component, one-coat type paint to which a curing agent is added prior to its use, and the polyisocyanate compound has a role as a curing agent. In the present invention, a polyisocyanate compound having two or more isocyanate groups at the terminal is used. As such polyisocyanate, the same polyisocyanate as exemplified in (B) hydroxyl group-containing polyurethane resin fine powder can be used.
[0037]
[II] Method for Preparing Matte Coating Composition for Polyolefin Molded Article (A) Binder resin and (B) Hydroxyl group-containing polyurethane resin fine powder respectively prepared as described above, (A) + (B) Mixing is performed so that (B) is preferably 20 to 80 parts by weight, more preferably 30 to 50 parts by weight with respect to 100 parts by weight (solid content weight). This mixing ratio also has a great influence on the properties of the coating film. When the proportion of (B) is less than 20 parts by weight, the chemical resistance is poor, and when it exceeds 80 parts by weight, the coating strength is lowered.
[0038]
In addition, you may add an extender pigment, a coloring pigment, a leveling agent, antioxidant, etc. to this coating composition as needed.
[0039]
(A) and (B) are dissolved in a solvent at the above ratio. Usable solvents include organic solvents for ordinary paints such as aliphatic hydrocarbon solvents, ester solvents, ketone solvents and ether solvents.
[0040]
Prior to its use, the matte coating composition for polyolefin-based molded articles of the present invention is added with (C) a polyisocyanate compound as a curing agent. (C) The polyisocyanate compound is added in an equivalent ratio of hydroxyl group: isocyanate group of 50:10 to 130: 10, preferably 75:10 to 110: 10.
[0041]
The matte coating composition for polyolefin-based molded articles of the present invention is applied to a mold so that the coating thickness is 10 to 70 μm, preferably 20 to 30 μm, by a predetermined coating method. A commonly used method can be selected as a coating method, but desirable methods are an air spray method, an airless spray method, a flow coater method, and the like. After coating, by maintaining at 70 to 90 ° C. for 30 minutes to 1 hour, a high-quality coating film with excellent adhesion can be formed on the surface of the polyolefin-based molded product.
[0042]
【Example】
EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to these.
[0043]
Examples 1-8
(I) Preparation of hydroxyl group-containing polyurethane resin fine powder First, 200 g of polyester polyol (“Desmorphen 1700”, manufactured by Nippon Polyurethane Industry Co., Ltd.) and 32 g of ethylene glycol were dissolved in 1100 g of xylene and heated at 80 ° C. for 2 hours.
[0044]
Subsequently, 20 g of coronade HL (hexamethylene diisocyanate: manufactured by Nippon Polyurethane Industry Co., Ltd.) was used for chain extension reaction to obtain a polyester polyurethane resin.
[0045]
Next, using a three-necked flask having a stirrer, a reflux condenser and a dropping funnel, while stirring, 130.5 g of the above polyester urethane resin and a dispersion aid oil-modified alkyd resin (coconut oil-modified, oil length 40%) 10.5 g (phthalkid 133-60 [manufactured by Hitachi Chemical Co., Ltd.]) is heated to about 85 ° C. together with 743.0 g of xylene as a dispersion medium. Thereby, the polyester urethane resin was dispersed and the oil-modified alkyd resin was dissolved.
[0046]
Next, 68.5 g of Colonnade HL (hexamethylene diisocyanate: manufactured by Nippon Polyurethane Industry Co., Ltd.) as isocyanate, 3.5 g of zinc naphthenate (metal content 6%) as reaction catalyst, and 1% of dibutyltin dilaurate as curing accelerator Xylene solution 12.Og was added and reacted at 85 ° C. for 2 hours.
[0047]
Thereafter, 35.0 g of propylene glycol monomethyl ether was added as a reaction terminator, maintained at 85 ° C. for 1 hour, unreacted isocyanate was removed, and 450 g of a suspension of polyurethane beads having a particle diameter of 20 to 70 μm was obtained. Obtained.
[0048]
The suspension was filtered to obtain a hydroxyl group-containing polyurethane resin fine powder. The obtained polyurethane resin fine powder had a hydroxyl value of 180.
[0049]
(II) Preparation of matte paint composition for polyolefin moldings A: Binder resin
(a-1) Acrylic graft polyester resin (Desmorphen 670, manufactured by Nippon Polyurethane Co., Ltd.)
(a-2) Chlorinated polyolefin graft acrylic resin (trade name “Acridick”, manufactured by Dainippon Ink & Chemicals, Inc.)
[0050]
B: Hydroxyl group-containing polyurethane resin fine powder prepared with matting agent (I)
C: Curing agent Multimer of hexamethylene diisocyanate (trade name “Duranate E-402-90T”, manufactured by Asahi Kasei Kogyo Co., Ltd.)
[0052]
According to the composition shown in Table 1, A binder resin and B matting agent were mixed and dispersed in 60 parts by weight of a xylene solvent to prepare a coating composition, and a C curing agent was added immediately before coating.
[0053]
[Table 1]

[0054]
(III) Coating The matte paint was applied to a polyolefin-based molded product so that the coating thickness was about 20 to 30 μm, and dried at 80 ° C. for 30 minutes.
[0055]
(IV) Performance evaluation (adhesion)
The test piece prepared under the above conditions is allowed to stand for 48 hours, and then a cross-cut tape peeling test is performed to evaluate the peeling of the coating film. Moreover, after leaving a test piece in warm water (40 degreeC) for 196 hours, the cross-cut tape peeling test was implemented and peeling of the coating film was evaluated.
[0056]
[Table 2]

[0057]
(Chemical wear resistance)
Take a test piece with a width of about 30 mm and a length of 200 mm, attach it to the friction tester II type test bench specified by HSL0849, and wear the white cotton cloth (Kanakin No. 3) immersed in the chemicals shown in Table 3 on the contact surface of the wearer The wear load was 2 N (200 gf) and the friction was reciprocated at a speed of reciprocating 30 times per 100 mm on the test piece at a rate of 30 reciprocations per minute, and the degree of white cotton cloth contamination and material wear was visually determined. The results are displayed in Table 3.
[0058]
[Table 3]

[0059]
(Airbag operation test)
An air bag operation test was conducted on an air bag cover with the paint of the present invention at −35 ° C. to 85 ° C. in the initial state to evaluate the state of the coating film. In addition, after heat aging (110 ℃, 1000 hours), after ozone degradation (50pphm, 40 ℃, 200 hours), after moisture degradation (50 ℃, 95% RH, 1000 hours), after cooling cycle (-30 ℃ (cooling) ), 50 ° C, 95% RH (thermal), 80 ° C (heating) for 1 cycle in 24 hours, 50 cycles)) after each aging test, air bag operation test at -35 ° C to 85 ° C As a result, for all of Examples 1 to 8, the set tear part was broken both in the initial state and after each deterioration test, and the paint does not peel off or crack and scatter even if the opening flap part rotates. Was confirmed.
[0060]
【The invention's effect】
As described in detail above, the matte coating composition for polyolefin molded articles of the present invention can be firmly adhered to the polyolefin molded article even with one coat, and can prevent scattering of the cover material when the airbag is activated. The resulting coating gives a high-quality matte feel (depth, suede) to the surface, and can maintain the matte state for a long time, so it can be used in a special environment (low temperature range) such as an air bag cover. It can be suitably used for surface coating of polyolefin-based molded products that operate at

Claims (6)

(A) at least (a-1) an acrylic graft polyester resin having a glass transition point of −60 to −30 ° C. and (a-2) a binder resin comprising a chlorinated polyolefin graft acrylic resin having a glass transition point of 30 to 60 ° C. ,
(B) a hydroxyl group-containing polyurethane resin fine powder,
(C) A matte coating composition for a polyolefin-based molded article, comprising a polyisocyanate compound having two or more isocyanate groups at the terminal as a main component. The matte coating composition for polyolefin molded articles according to claim 1, wherein the (a-1) acrylic graft polyester resin has an acrylic resin component of 10 to 30%, a molecular weight of 15,000 to 45,000, and a hydroxyl value of 2 to 2. 15 (a-2) chlorinated polyolefin graft acrylic resin, 10-30% chlorinated polyolefin resin component, molecular weight 30,000-50,000, (a-1): (a-2) is a weight ratio A matte coating composition for polyolefin-based molded articles, characterized in that the ratio is 20:80 to 60:40. The matte coating composition for polyolefin-based molded articles according to claim 1 or 2, wherein the (B) hydroxyl group-containing polyurethane resin fine powder comprises a polyurethane resin having a hydroxyl value of 100 to 250. Matte paint composition for goods. The matte coating composition for polyolefin molded articles according to any one of claims 1 to 3, wherein the (B) hydroxyl group-containing polyurethane resin fine powder has an average particle size of 20 to 70 µm. Matte paint composition for molded products. The matte coating composition for polyolefin-based molded articles according to any one of claims 1 to 4, wherein the (B) hydroxyl group-containing polyurethane resin fine powder is 20 to 80% by weight (provided that (A) + (B) = 100% by weight) Matte coating composition for polyolefin-based molded products. The matte coating composition for polyolefin-based molded articles according to any one of claims 1 to 5, wherein the (C) polyisocyanate compound is a ratio of 50:10 to 130: 10 in an equivalent ratio of hydroxyl group: isocyanate group. A matte coating composition for polyolefin-based molded articles, characterized by comprising: