JPH0555541B2 - - Google Patents

Description

[Detailed description of the invention]

[Background of the Invention] <Industrial Field of Application> The present invention relates to a coated molded body formed from an olefin resin material and coated on the surface of the molded body. More specifically, moldings formed from resin compositions consisting of olefinic resins, copolymers of ethylene with hydroxyl group-containing unsaturated compounds, and copolymers of ethylene and carboxyl group (including acid anhydride groups)-containing unsaturated compounds The present invention relates to a coated molded article in which a coating is applied directly to the surface of a molded article formed from a resin composition made by adding an elastomer component to each of these components. <Prior art> JP-A-63-275656 discloses propylene-based polymers, copolymers of ethylene and unsaturated compounds containing carboxyl groups (including acid anhydride groups), and copolymers of ethylene and unsaturated compounds containing hydroxyl groups. The invention relates to a propylene polymer composition comprising a copolymer with. However, this invention was developed to improve heat resistance and vacuum formability in order to improve the shortcomings of the previous technology, which caused the sheet to sag when vacuum forming a propylene polymer sheet, making it impossible to obtain a good product. The purpose of this invention is to provide a composition that
The amount of the copolymer of ethylene and a carboxyl group-containing unsaturated compound and the copolymer of ethylene and a hydroxyl group-containing unsaturated compound to be blended varies widely. By crosslinking, the heat resistance and vacuum formability are improved. Therefore, in the invention of the composition, there is no recognition of a resin composition that can improve paintability, and there is no description suggesting this. In addition, the range of the amount of the ethylene copolymer containing a polar group is too wide for the purpose of a paintable resin composition, and includes a range in which the purpose cannot be achieved. There is. That is, for the entire range of particularly preferred formulations of this prior art invention, direct application of the paint does not result in satisfactory paint adhesion (see Comparative Example 13). Therefore, it was necessary to newly consider a composition with good paintability from a different perspective than the invention in the prior art. <Problems to be Solved by the Invention> In general, polyolefin resins do not have polar groups in their structures and are highly crystalline, so it is known that paints do not adhere very well to them and their paintability is poor. ing. Therefore, in order to improve this poor adhesion, the surface of the polyolefin resin is modified by applying a primer or plasma treatment in advance to improve the paintability before applying the paint. Was. However, such coating methods have conventionally had the following problems. In other words, the primer coating method requires the use of expensive primers,
The disadvantage is that the painting cost increases due to the increased number of painting processes, but in addition to that,
The need to activate the solvent in the primer created a poor working environment, and there was also a risk of fire and safety. On the other hand, in the plasma processing method, since a high degree of vacuum is required, expensive equipment must be installed, and furthermore, since the method is a batch method, an increase in cost cannot be avoided. Furthermore, the surface after plasma treatment is unstable, and the adhesion of the paint decreases when it comes into contact with foreign matter, which can lead to variations in coating film performance, making handling extremely inconvenient. Therefore, if such primer application and plasma treatment processes could be omitted, it would be possible to simplify the painting process, improve the working environment, and reduce costs. Many studies have also been conducted to try to improve these problems. However, in the end, this goal has not yet been achieved, and with polyolefin resin materials, such primer application and plasma treatment cannot be omitted, and if painting is applied after such treatment, There are many. On the other hand, if paint is applied directly to the resin molded body without any treatment such as primer application, additives such as light stabilizers, antioxidants, and lubricants added to the resin composition may be added to the paint. It is also known that it may reduce adhesion. [Summary of the Invention] <Summary> As a result of intensive research in view of the above problems, the present inventors have found that the above problems can be solved by using a specific resin composition for the object to be coated. Based on this knowledge, we have completed the present invention. That is, the coated molded article of the present invention contains an olefinic resin, 0.01 to 30 parts by weight of a copolymer of ethylene and a hydroxyl group-containing unsaturated compound per 100 parts by weight of the olefinic resin, and ethylene and a carboxyl group ( A molded article formed from a resin composition containing 0.01 to 20 parts by weight of a copolymer with an unsaturated compound (containing an acid anhydride group) (1 to 200 parts by weight of an elastomer component may be further blended). This is a coated molded article characterized in that a paint is directly applied to the surface of the article. <Effects> The coated molded body of the present invention uses specific components in the resin composition forming the molded body, so that the coated molded body of the present invention has the advantage that it is impossible to directly coat olefin resin using the conventional methods. Overturning the common sense that “there is.”
Good paint adhesion can be exhibited even when the paint is directly applied to the molded body without prior surface modification treatment such as primer coating or plasma treatment. In addition, even if additives such as commonly used resin light stabilizers, antioxidants, and lubricants are added to the resin composition, the paint adhesion strength will not decrease and good paint adhesion will be achieved. It is extremely useful industrially. [Specific description of the invention] [] Resin composition (1) Constituent components The resin composition forming the coated molded article of the present invention is basically formed from the constituent components shown in (a) to (c) below. has been done. (a) Olefin resin The olefin resin used in the present invention includes ethylene, propylene,
-butene, 3-methyl-1-butene, 4-
Methyl-1-pentene, 1-hexene, 1
- A homopolymer of α-olefins represented by pentene etc., or a copolymer of these α-olefins, and in addition, it is a JIS
−The flexural modulus measured according to K7203 is
1000~20000Kg/ ^cm2 , preferably 2000~
18000Kg/cm ² , particularly preferably 3000-15000
Kg/cm ² of resin may be mentioned. The melt flow rate (MFR) of this copolymer resin is not particularly limited, but the value measured in accordance with ASTM-D1238 is usually 0.01 to 200 g/10 minutes, preferably 0.1 to 100 g/10 minutes. Optimally within this range. Specifically, for example, polyethylene resins such as so-called low-pressure polyethylene, medium-pressure polyethylene, high-pressure polyethylene, linear low-density polyethylene, stereoregular polypropylene, stereoregular poly-1-butene, stereoregular polyethylene, etc. Examples include stereoregular poly-α-olefin resins such as 4-methyl-1-pentene. Among these olefin resins, stereoregular polypropylene (hereinafter simply referred to as "propylene resin") is preferred. Among this propylene resin, propylene and other α
Copolymers with -olefins are preferred, particularly copolymers with ethylene. The copolymer may be a random copolymer or a block copolymer, but a block copolymer is particularly preferred. These olefin resins can be used alone or as a mixture of two or more of the above resins, and can usually be appropriately selected from commercially available resins. (b) Copolymer of ethylene and hydroxyl group-containing unsaturated compound The copolymer of ethylene and hydroxyl group-containing unsaturated compound used in the coated molded article of the present invention may be branched or It refers to all compounds having a structure in which hydroxyl group-containing unsaturated compounds are copolymerized with ethylene in a linear carbon chain, either irregularly or regularly. Specifically, the content of the hydroxyl group-containing unsaturated compound is 0.1 to 50% by weight, preferably 0.5 to 50% by weight.
45% by weight, particularly preferably 1 to 40% by weight, and the melt flow rate (MFR) measured in accordance with JIS-K6760 is
0.1~1000g/10min, preferably 0.5~700
g to 10 minutes, particularly preferably 1 to 500 g/10
It includes polymers that are liquid, semi-solid, and solid at room temperature. Such a copolymer of ethylene and a hydroxyl group-containing unsaturated compound can be produced by a well-known method such as a high-pressure radical polymerization method using ethylene and a hydroxyl group-containing unsaturated compound as raw materials. In the case of production by the high-pressure radical polymerization method, ethylene, a hydroxyl group-containing unsaturated compound, and a radical polymerization initiator are placed in a reaction zone maintained at a pressure of 1000 to 3000 atm and a temperature of 90 to 300°C, for example. Continuously feed the unsaturated compound at a ratio of 1:0.0001 to 1:0.1 to obtain an ethylene copolymer at a conversion rate of 3 to 20%, and continuously take out the copolymer from the reaction zone. Manufactured by Examples of such hydroxyl group-containing unsaturated compounds include 2-hydroethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, Examples include poly(ethylene glycol) monomethacrylate. In addition to the above-mentioned ethylene and hydroxyl group-containing unsaturated compound components, third copolymerization monomer components include unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and methyl methacrylate; styrene, α-methylstyrene, and vinyltoluene. Vinyl aromatic compounds such as: Nitrile compounds such as acrylonitrile and methacrylonitrile; Vinyl pyridines such as 2-vinylpyridine and 4-vinylpyridine; Vinyl ethers such as methyl vinyl ether and 2-chloroethyl vinyl ether:
Examples include vinyl halides such as vinyl chloride and vinyl bromide; vinyl esters such as vinyl acetate; acrylamide; and they can also be used as ternary or multicomponent copolymers. These copolymers can be used alone or as a mixture of multiple types. (c) Copolymer of ethylene and unsaturated compound containing carboxyl group (including acid anhydride group) Ethylene and unsaturated compound containing carboxyl group (including acid anhydride group) used in the coated molded article of the present invention From a structural standpoint, a copolymer with ethylene is a copolymer of unsaturated compounds containing carboxyl groups (including acid anhydride groups) randomly or regularly in branched or linear carbon chains. Refers to all things that have a structure that Specifically, the content of unsaturated compounds containing carboxyl groups (including acid anhydride groups) is 0.1 to
40% by weight, preferably 0.5 to 35% by weight, particularly preferably 1 to 30% by weight, and the melt flow rate (MFR) measured according to JIS-K6760 is 0.1 to 1000.
g/10 minutes, preferably 0.5-700g-10 minutes,
Particularly preferably 1 to 500g/10 minutes,
Includes polymers that are liquid, semi-solid, or solid at room temperature. This ethylene/carboxyl group (including acid anhydride group)-containing unsaturated compound copolymer is
Using ethylene and an unsaturated compound containing carboxyl groups (including acid anhydride groups) as raw materials,
It can be produced by a well-known method such as high-pressure radical polymerization. In the case of production by the high-pressure radical polymerization method, ethylene, an unsaturated compound containing a carboxyl group (including an acid anhydride group), and a radical polymerization initiator are heated at a pressure of, for example, 1000 to 3000 atm and a temperature of 90 to
In a reaction zone maintained at 300°C, the ratio of ethylene to an unsaturated compound containing a carboxyl group (including an acid anhydride group) is 1:0.0001 to 1:1.
Ethylene copolymer is produced by continuously supplying the ethylene copolymer at a conversion rate of 0.1% to 3% to 20%, and continuously taking out the copolymer from the reaction zone. Ru. Specific examples of such unsaturated compounds containing carboxyl groups (including acid anhydride groups) include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid,
Examples include unsaturated carboxylic acids such as citraconic acid, tetrahydrophthalic acid, norbornene-5,6-dicarboxylic acid, and anhydrides thereof, and acid anhydrides thereof. Among these specific examples, acrylic acid and methacrylic acid are preferred. In addition to the above-mentioned ethylene and carboxyl group (including acid anhydride group)-containing unsaturated compound component, as a third copolymerization monomer component, unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and methyl methacrylate;
Vinyl aromatic compounds such as styrene, α-methylstyrene, and vinyltoluene; Nitrile compounds such as acrylonitrile and methacrylonitrile; Vinyl pyridines such as 2-vinylpyridine and 4-vinylpyridine; Methyl vinyl ether, 2-chloroethyl vinyl ether, etc. vinyl ether; vinyl chloride;
Examples include vinyl halides such as vinyl bromide, vinyl esters such as vinyl acetate, acrylamide, etc., and it is also possible to use them as ternary or multicomponent copolymers. These copolymers can be used alone or as a mixture of multiple types. (d) Elastomer component The elastomer component used in the coated molded article of the present invention is as follows:
At least one type of elastomer selected from styrenic and olefinic elastomers is optimal. Styrenic elastomers The styrene elastomers mentioned above include elastomeric random or block copolymers of styrene compounds such as styrene and α-methylstyrene and conjugated dienes such as 1,3-butadiene and isoprene, and copolymers of these copolymers. It is a hydrogen additive. Among these styrene-based elastomers, block copolymers of a styrene-based compound and a conjugated diene are preferred, and those whose general formula is represented by the following formula are optimal. General formula (A-B) _o+1 , or A-(B-A) _o , or B-(A-B) _o+1 (A in the above formula is a polymer block made of a styrene compound, and B is These are conjugated diene polymer blocks, n is an integer of 1 to 20, and the proportion of the A block to the entire molecule is 1 to 50% by weight.) The average molecular weight of these copolymers is 10,000.
-1000000, preferably 50000-250000. Specific examples of these styrene-based elastomers include styrene-butadiene random copolymer, styrene-isoprene random copolymer, styrene-butadiene-styrene triblock copolymer, styrene-isoprene-styrene triblock copolymer, and polystyrene block copolymer. styrene-butadiene radial block copolymer with terminals, styrene-isoprene radial block copolymer with polystyrene blocks,
Examples include styrene/conjugated diene block copolymers such as butadiene multiblock copolymers, styrene/isoprene block copolymers, and hydrogenated products thereof. Preferred among these styrene elastomers are hydrogenated styrene/conjugated diene block copolymers. Olefin Elastomer The above olefin elastomer may be a copolymer of α-olefins such as ethylene, propylene, 1-butene, or 1-hexene, or a copolymer of these with a non-conjugated diene, or a copolymer of 1-hexene or the like. It is a homopolymer of high-grade α-olefin, and is an elastomer-like polymer with a Mooney viscosity measured at 100℃.
ML ₁₊₄ is usually 1-200, preferably 5
-150, particularly preferably 7-100. Among these olefin elastomers, ethylene elastomers are particularly preferred in terms of quality and stability. Specifically, ethylene/propylene copolymer rubber (EPM), ethylene/1-butene copolymer rubber, ethylene/propylene/1
-Butene copolymer rubber, ethylene/propylene/non-conjugated diene copolymer rubber (EPDM), ethylene/1-butene/non-conjugated diene copolymer rubber, ethylene/propylene/1-butene/non-conjugated diene copolymer rubber, etc. . Specific examples of the non-conjugated diene include dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, dicyclooctadiene, methylene norbornene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene,
-methylene-2-norbornene, 5-methyl-1,4-hexadiene, 7-methyl-1,6-octadiene, and the like. Among these elastomer components,
In particular, olefin elastomers are preferably used because they are less likely to cause surface roughening of the molded product. (e) Additional components In the resin composition forming the coated molded article of the present invention, the above (a) to (c) or (a) to (d) may be added to the extent that the effects of the present invention are not significantly impaired. )
In addition to the essential components, additional components as shown below can be included. The additional components include, for example, inorganic fillers, specifically natural silica such as quartz,
Synthetic silica manufactured by wet or dry methods, natural silicates such as kaolin, mica, talc, and asbestos, synthetic silicates such as calcium silicate and aluminum silicate, metal hydroxides such as magnesium hydroxide and aluminum hydroxide, and alumina. , metal acid compounds such as titania, metal powders such as calcium carbonate, aluminum, bronze, carbon black, glass fiber, oxygen fiber, potassium titanate, calcium sulfate, zinc oxide, silicon titanide, sapphire, beryllia, boron carbide, carbonized There are whiskers such as silicon. Also included are lubricants, plasticizers or fluidity improvers, and other additives, such as colorants, stabilizers, dispersion aids, molecular weight regulators, crosslinking agents, and nucleating agents. (2) Quantitative ratio The quantitative ratio of the above-mentioned components constituting the resin composition used in the present invention is usually as follows: (b) to 100 parts by weight of the olefinic resin of the (a) component.
The component copolymer of ethylene and hydroxyl group-containing unsaturated compound is 0.01 to 30 parts by weight, preferably
The amount is in the range of 0.05 to 25 parts by weight, particularly preferably 0.1 to 20 parts by weight, and the copolymer of ethylene and the unsaturated compound containing carboxyl group (including acid anhydride group) as component (c) is in the range of 0.01 to 25 parts by weight. It is in the range of 20 parts by weight, preferably from 0.05 to 10 parts by weight, particularly preferably from 0.1 to 7 parts by weight. If the blending amount of component (b), a copolymer of ethylene and an unsaturated compound containing a hydroxyl group, is less than the above range, the adhesion of the paint may be poorly reproducible or the adhesion strength of the paint may be weak. Undesirable. On the other hand, when the above range is exceeded, the amount of the expensive polymer added increases, which increases the cost of the resin composition, and also causes delamination and bleed-out of the polymer, which reduces the adhesion of the paint. This is not preferable because it causes a decrease in the temperature. In addition, if the copolymer of component (c), ethylene and an unsaturated compound containing carboxyl groups (including acid anhydride groups), is less than the above range, the adhesive strength may be very weak depending on the paint to be applied. This is not desirable. On the other hand, if the amount exceeds the above range, not only will the cost of the resin composition increase due to the large amount of the expensive polymer added, but also results that will not be proportional to the amount of the polymer added. In addition, the crosslinking density of the polymer increases due to delamination or the reaction with the above-mentioned copolymer of ethylene and hydroxyl group-containing unsaturated compound, resulting in decreased paintability, poor painted appearance, and moldability. This is not preferable because it reduces the Further, it is convenient to further blend the elastomer component (d) into the resin composition having the above-mentioned blending ratio of the constituent components, since rigidity, impact resistance, etc. can be adjusted. Therefore, from the viewpoint of mechanical strength, the elastomer component should be added to 1 part by weight per 100 parts by weight of the olefin resin.
It is preferable to use up to 200 parts by weight, preferably 5 to 150 parts by weight, particularly preferably 10 to 100 parts by weight. (3) Mixing The resin composition that forms the molded article of the present invention is produced by mixing the above-mentioned components. There is no particular restriction on the mixing order of each of these components, and any method can be used, such as mixing the above components at the same time, mixing any two components in advance, and then mixing the remaining components. Good too. As a mixing method, any conventionally known kneading machine can be used, such as a Brabender blastograph, a single-screw or twin-screw extruder, a high-intensity screw kneader, a Banbury mixer, a kneader, and a roll. [] Molded object The molded object of the present invention can be obtained by molding the above resin composition by various molding methods. Molding can be performed by a conventional method. That is, any molding method such as injection molding, compression molding, extrusion molding (sheet molding, blow molding), etc. may be used. It is particularly effective for molded articles injection molded into complex shapes. [] Coating As a coating method for forming the coated molded article of the present invention, a conventional coating process excluding surface modification processes such as primer application and plasma treatment can be adopted. That is,
A paint is applied to a molded article obtained by forming and processing the above resin composition either directly or after degreasing if necessary. In the present invention, "directly painting" means applying the paint without applying the conventional primer application or plasma treatment, and unless it deviates from the technical concept of the present invention, it is necessary to apply some kind of paint before applying the paint. This does not exclude surface treatment. One example of such surface treatment is degreasing treatment. This type of degreasing treatment is a normal operation that is generally performed just before applying paint, and this removes the unavoidable adhesion to the surface of the molded product during the process from molding the resin composition to painting. It is possible to wash and remove dirt from hands, machine oil, etc. Specifically, there are cleaning methods using organic solvents or their vapors, water, steam, acids, alkaline aqueous solutions, surfactant aqueous solutions, etc. Among these, cleaning methods using organic solvent vapors and various aqueous solutions are preferably used. Furthermore, the means for applying the paint include spraying, brushing, roller application, and the like, and any of these methods can be employed. As the paint that can be used in this painting process, commonly used paints such as acrylic paints, epoxy paints, polyester paints, urethane paints, alkyd paints, etc. can be used. Among these, acrylic paints and urethane paints are preferred, and acrylic paints are particularly preferred. [] Painted resin molded body The molded body painted in this way is coated with paint to a thickness of generally 10 to 100 μm, preferably 20 to 70 μm, and the coating film is firmly adhered. We manufacture various industrial parts such as automobile exterior parts such as automobile bumpers, mudguards, side moldings, wheel caps, and spoilers, automobile interior parts such as instrument panels, levers, knobs, and interior linings, pots, vacuum cleaners, It can be used for electrical appliances such as washing machines, refrigerators, lighting equipment, audio equipment, and everyday miscellaneous goods such as color boxes and storage cases. [Example] The present invention will be described in more detail below with reference to Examples and Comparative Examples. The molding conditions and test methods for obtaining test samples from the resin compositions produced in each example are as shown below. Note that "parts" in the experimental examples are parts by weight. <Molding conditions> Molding machine Injection molding machine M40A-SJ manufactured by Meiki Seisakusho Molding temperature 230℃ Molded product Flat plate (65 mm x 65 mm x 2 mm) Three-point bending modulus test piece (90 mm x 10 mm x 4 mm) Flexural modulus JIS K Measured in accordance with -7203. Measured in accordance with MFR ASTM D-1238. <Painting> Paint Painting was performed using a one-component acrylic paint and a one-component urethane paint. Painting method Mix each paint individually and use an air spray gun to obtain a coating thickness of approximately 40 μm in a grid test.
The coating was applied by spraying so that the peel strength test was approximately 100 μm. After that, acrylic paint
The urethane paint was baked and dried at 100°C for 60 minutes, and at 120°C for 60 minutes. <Paint adhesion evaluation> Checkerboard test Using a single-edged razor, draw 11 vertical and horizontal parallel lines perpendicular to the surface of the test piece at 2mm intervals to create a checkerboard pattern.
Make 100 pieces. On top of that, cellophane adhesive tape (JIS
Z1522) was sufficiently crimped, maintained at approximately 30 degrees to the coating surface, and peeled off at once toward the viewer.The partial tails surrounded by the grid were observed, and the number of grid marks that did not peel off was recorded. Peel strength The upper half of the test piece was treated to prevent paint from adhering to it, and then each paint was applied to the lower half to increase the film thickness.
It was applied to a thickness of 100 μm and baked and dried.
Cellophane adhesive tape (e.g. made by Nichiban) was applied to the test piece.
24mm) to the entire surface, and make a 1cm wide cut vertically extending all the way to the substrate. The side to which the paint film was not attached was peeled off by hand, and the load was recorded when it was attached to a tensile testing machine and peeled off in a 180 degree direction at a speed of 50 mm/min. In addition, when the coating film was broken, it was described as broken. Examples 1 to 22 and Comparative Examples 1 to 13 Production of resin moldings The components shown in Tables 1 and 2 were blended and melt-kneaded at 200°C using a twin-screw extruder to form pellets. This pellet was used to injection mold a flat plate and a test piece for three-point bending modulus measurement. The ingredients in Tables 1 and 2 are as follows. <Olefin resin: component (a)> Block PP (1): A propylene/ethylene block copolymer with an ethylene content of 8.2% by weight, a flexural modulus of 10000 Kg/cm ² , and an MFR of 33 g/10 min. Block PP (2): A propylene-ethylene block copolymer with an ethylene content of 13% by weight, a flexural modulus of 6000 Kg/cm ² and an MFR of 30 g/10 min. Block PP: Propylene-ethylene random copolymer with ethylene content of 3.4% by weight, flexural modulus of 10500 Kg/cm ² and MFR of 15 g/10 min. Single PP: Flexural modulus is 13000Kg/ ^cm2 and MFR
Polypropylene which is 25g/10min. HDPE: Flexural modulus is 9000Kg/cm ² and MFR is
20g/10min high density polyethylene. <Copolymer with ethylene/hydroxyl group-containing unsaturated compound: component (b)> (MFR was measured in accordance with JIS-K6760) EHM (1): 2-hydroxy obtained by high-pressure radical polymerization method Ethyl methacrylate content 10% by weight,
Ethylene/2-hydroxyethyl methacrylate copolymer with MFR of 7g/10 minutes. EHM (2): 2-hydroxyethyl methacrylate content 10% by weight, obtained by high-pressure radical polymerization method,
Methyl acrylate content 10% by weight, MFR
13g/10min ethylene/2-hydroxyethyl methacrylate/methyl acrylate terpolymer. EHM (3): 2-hydroxyethyl methacrylate content 10% by weight, obtained by high-pressure radical polymerization method,
Methyl acrylate content 10% by weight, MFR
100g/10min of ethylene/2-hydroxyethyl methacrylate/methyl acrylate copolymer. <Ethylene and carboxyl groups (including acid anhydride groups)
Copolymer with containing unsaturated compound: component (c)> (in addition,
MFR was measured in accordance with JIS-K6760) EAA (1): Ethylene-acrylic acid copolymer obtained by high-pressure radical polymerization, with an acrylic acid content of 13% by weight and an MFR of 7 g/10 minutes. EAA(2): Ethylene/acrylic acid copolymer with acrylic acid content of 20% by weight and MFR of 300g/10 minutes obtained by high-pressure radical polymerization method. <Elastomer component: component (d)> EPM (1): Ethylene-propylene copolymer rubber with Mooney viscosity ML ₁₊₄ (100°C) of 70 and specific gravity of 0.86. EPM(2): Ethylene-propylene copolymer rubber with Mooney viscosity ML ₁₊₄ (100℃) of 24 and specific gravity of 0.86. EPDM: Ethylene-propylene-ethylidenenorbornene copolymer rubber with Mooney viscosity ML ₁₊₄ (100℃) of 47 and specific gravity of 0.86. SEBS: A hydrogenated product of styrene-butadiene block copolymer rubber with a number average molecular weight of 70,000 and a specific gravity of 0.91. <Additive: component (e)> Phenolic antioxidant: "Irganox 1010" manufactured by Ciba Geigy {Tetrakis [Methylene-
3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane). HALS (hindered amine light stabilizer): "Sanol 770" manufactured by Sankyo Co., Ltd. (bis-2,2,6,6-tetramethyl-4-piperidinyl sebacate). Lubricant: "Nyutron" (oleic acid amide) manufactured by Nippon Fine Chemical Co., Ltd. Coating of resin molding After degreasing the flat plate molded by the above resin molding process with trichloroethane vapor for 30 seconds, using an air gun. Paint was applied. After baking and drying, it was left at room temperature for 48 hours and then a grid test was conducted. Tables 1 and 2 show the results of the elastic modulus and paint adhesion of the resin compositions obtained. In the composition shown in Comparative Example 3, the flexural modulus could not be measured by the measuring method based on JIS-K7203 because it was too soft. Furthermore, during painting, the flat plate of the test piece was severely deformed during baking and drying after coating, and the surface of the flat plate also became uneven, making it impossible to evaluate. In addition, from the formulations of Comparative Examples 4 to 7 in Tables 1 and 2, it can be seen that the paint adhesion is good without the additive (e), but when the additive is added, the paint adhesion is poor. It can be seen that there is a rapid decline. However, compared to these, it can be seen that the formulations of Examples 16 and 20 to 22 exhibit considerably stronger paint adhesion despite the addition of component (e).

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Claims (1)

[Claims] 1. Olefin resin, said olefin resin 100
0.01 to 30 parts by weight of a copolymer of ethylene and an unsaturated compound containing a hydroxyl group and 0.01 to 20 parts by weight of a copolymer of ethylene and an unsaturated compound containing a carboxyl group (including acid anhydride) based on the weight part 1. A coated molded article, characterized in that a paint is directly applied to the surface of the molded article formed from a blended resin composition. 2 Olefin resin, said olefin resin 100
0.01 to 30 parts by weight of a copolymer of ethylene and an unsaturated compound containing a hydroxyl group, and 0.01 to 20 parts by weight of a copolymer of ethylene and an unsaturated compound containing a carboxyl group (including acid anhydride) based on the weight part. and a coated molded article, characterized in that a paint is directly applied to the surface of a molded article formed from a resin composition containing 1 to 200 parts by weight of an elastomer component.