JP3437222B2 - Painted automotive parts - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article for automobile parts.
For automotive parts coated with paint directly applied to the surface
It is about. [0002] Conventionally, fenders, door panels, bumpers
ー, spoiler, mat guard, side molding, wheel
Outer caps and instrument panels, such as
Profiles used as levers, knobs, lining, etc.
In many cases, automotive resin components made of resin
The part has been painted and finished for practical use. Only
However, automotive parts made of propylene-based resin
Since there is no polar group in the structure of
It is difficult to obtain a practical level of paint adhesion strength with cloth
won. Therefore, the automotive parts are often preformed
The surface of the car parts that have been removed by TCE (trichloroethane)
Grease and apply primer or plasma treatment.
By doing so, the paint adhesion performance has been improved. [0003] However, this problem
In the painting method such as
There was a title. First, TCE degreasing treatment
Under the Protocol, use will be banned after 1995. Ma
In addition, in the primer coating method, expensive primers are used.
Use must be done and painting constants will increase
This has the disadvantage of increasing painting costs,
In addition, it is necessary to volatilize the primer solvent.
With the danger of fire, there was also a problem with safety. one
On the other hand, plasma processing requires a high vacuum
Expensive equipment must be installed,
Perhaps because of the batch type, it is possible to avoid rising costs
I didn't come. In addition, recent automotive parts with complicated shapes
Makes it difficult to perform uniform treatment and comes in contact with foreign matter
And paint adhesion are reduced, resulting in uneven coating film performance.
In some cases, handling was very inconvenient. Follow
In the coating of automotive parts made of propylene resin,
Eliminates TCE processing, primer application, and plasma processing
If it can be omitted, simplification of the painting process and
Is it possible to improve and reduce costs?
Many studies have attempted to omit these steps.
Research has been done. However, made of propylene resin
Automotive components are manufactured using such TCE treatment and primer coating.
Paint without leaving fabric or plasma treatment indispensable
Is often given. In addition, such processing
If not, the strength of the coating film is insufficient,
The efficiency was low, and the application was often limited. [Summary of the Invention] The present inventors have set out to achieve the above object.
As a result of repeated studies,
Automobile parts molded using the resin composition directly apply paint
Despite the application, it has practically sufficient paint adhesion performance,
Complete the present invention by finding that it has one mechanical strength
Reached. That is, for an automobile coated with the coating of the present invention.
The component consists of the following components (a), (b), (c), (d) and (e),
In some cases, either component (f) or component (g) or
Is a resin composition consisting of each component containing both as essential components.
And X-ray photoelectron spectroscopy (XPS / ESCA)
Of oxygen atoms to carbon atoms on the surface of the molded body
When the concentration is 0.5% or more, the flexural modulus is 7,000 kg /
cm ^Two A molded article for automobile parts satisfying the above condition
Characterized in that a coating film is formed directly on the surface of
Things. Component (a): contains 4 to 30% by weight of a room temperature xylene-soluble component having an ethylene content of 20 to 70% by weight, has an MFR of 1 to 200 g / 10 minutes for the whole copolymer, and has an ethylene content of 3 to 3%. Component (b): at least one elastomer selected from ethylene-based elastomers and styrene-based elastomers Component (b): 10 to 50% by weight Component (c): Mooney viscosity ML _{1 + 4} (100 ° C.) of 5 or less, MFR (230 ° C., 2.16 kg) of 30 g / 10 min or more, propylene content of 20 to 35% by weight Ethylene / propylene copolymer rubber 1 to 15% by weight Component (d): Terminal Component (e): Talc having an average particle size of 5 μm or less, aluminum borate whisker having an average particle size of 2 μm or less and an average aspect ratio of 5 or more, At least one filler selected from the group consisting of the potassium titanate whisker, the magnesium sulfate whisker (magnesium oxysulfate whisker: MgSO 4 .5 Mg (OH) 2 .3H 2 O), the titanium oxide whisker and the calcium carbonate whisker 3 to 40% by weight Component (f): Ethylene / unsaturated carboxylic acid copolymer 0 to 25% by weight Component (g): Oxyacid compound 0 to 10% by weight [Specific description of the invention] [I] Production of polymer composition (1) Raw material (a) Constituent component (essential component) Component (a): propylene / ethylene block copolymer Used in automotive parts coated with the present invention
Propylene / ethylene block of component (a) in the resin composition
Copolymer has a ethylene content of 20 to 70% by weight.
4-30 weight% of normal temperature xylene soluble matter which is amorphous
%, Preferably 6 to 25% by weight of resin
Also, the MFR of the entire copolymer resin (230 ° C., 2.16
kg) is 1 to 200 g / 10 min, preferably 10 to 10 g.
0 g / 10 min and the total ethylene content is 3 to 2
It is 1% by weight, preferably 3 to 18% by weight. This
Here, the ethylene content is measured by infrared spectroscopy, etc.
It is a value determined at normal temperature,
Dissolve the sample by immersing it in 500 g of boiling xylene for 20 minutes
After cooling to room temperature, the precipitated solid phase is
Value calculated from the solid phase weight obtained by filtration with a filter.
MFR was measured according to JIS-K7210.
It is. The ethylene content of this copolymer resin and the room temperature
If the xylene solubles are less than the above range,
Poor impact resistance when painted automotive parts
On the other hand, those exceeding the above range have rigidity
Shortage. The production of this copolymer resin is usually
Is used. This propylene-ethyl
The ren block copolymer significantly impairs the effects of the present invention.
To the extent that other unsaturated monomers {e.g., butene-1,
Α-olefins such as hexene-1, vinyl acetate
Nyl ester, (meth) acrylic acid (ester) or anhydrous
Contains unsaturated organic acids such as maleic acid or derivatives thereof
Terpolymers (graft type, random type,
Any type of lock type may be used). here
Of the propylene / ethylene block copolymer of component (a)
The compounding amount is 40 to 80% by weight, preferably 50 to 70 weight
%. If the amount of component (a) is less than the above range, molding
If the above range is exceeded, physical balance and paint
It is not suitable because the mounting performance is reduced. Component (b): Elastomer Used in automotive parts coated with the present invention.
The elastomer of the component (b) in the resin composition is ethylene
Propylene binary copolymer rubber (EPM), ethylene pro
Pyrene / non-conjugated diene terpolymer rubber (EPDM), d
Styrene, propylene, butene-1 terpolymer rubber, etc.
Tylene elastomer, hydrogenated styrene / butadiene
・ Styrene block copolymer and hydrogenated styrene
Styrene-based elastomers such as soprene block copolymer
At least one selected from: ethylene·
Propylene binary copolymer rubber (EPM) has propylene content
Is 20 to 55% by weight, preferably 20 to 50% by weight,
Knee viscosity ML _{1 + 4} (100 ° C) is 15-100, especially
Preferably it is 15-90. In addition, ethylene
Propylene / non-conjugated diene terpolymer rubber (EPDM)
In this case, those having an iodine value of 20 or less are preferable. ethylene·
Propylene / butene-1 terpolymer rubber is propylene
And butene-1 content is 20 to 55 weights respectively.
%, Preferably 25-50% by weight, and 3-15% by weight
%, Preferably 5 to 12% by weight. here,
The content of each component is usually determined by infrared spectroscopy or NMR.
It is a value measured by a method or the like. Also, for example, hydrogenation
Styrene-butadiene-styrene block copolymer and
Hydrogenated styrene-isoprene block copolymer is
Styrene / butadiene fully or partially hydrogenated, respectively
-Styrene block copolymer, styrene-isoprene
Block copolymer, styrene / isoprene / styrene
So-called styrene / ethylene / butyl copolymer of rock copolymer
-Styrene block copolymer, styrene-ethylene /
Propylene block copolymer, styrene / ethylene / p
Propylene / styrene block copolymer, etc.
Its hydrogenation rate is 95% or more, but 99% or more
preferable. The styrene content is preferably 5 to 50% by weight.
In particular, those having 10 to 50% by weight are preferable. Of these elastomers, those outside the above range
Is unsuitable because of poor coating performance and physical property balance. Also,
Preferably, the elastomer is substantially amorphous,
Those having a crystallinity of 5% or less are preferred. These manufacturing methods
The shape and shape are not particularly limited. Where the amount of component (b) is
10-50% by weight, preferably 20-40% by weight, painted
In terms of performance, it is particularly preferable that the content be 20 to 35% by weight.
No. If it is less than the above range, the coating strength and impact resistance are inferior, and
Exceeding the above range will result in inferior heat resistance rigidity and surface hardness.
Not suitable. Component (c): ultra-low viscosity ethylene / propylene
Binary copolymer rubber Used in automotive parts coated with the present invention
Ultra-low viscosity ethylene propylene of component (c) in the resin composition
Binary copolymer rubber has Mooney viscosity ML _{1 + 4} (100
° C) is 5 or less and MFR (230 ° C, 2.16 kg) is 3
0 g / 10 min or more, preferably 40 g / 10 min or more
Therefore, the propylene content is 20 to 35% by weight.
You. MFR (230 ° C, 2.16kg) is 30g / 10
If it is smaller than the minute, the effect on improving the coating performance will be lost
If the amount exceeds 10% by weight,
There is no problem with coating performance, but lower the balance of physical properties
Not suitable for The amount of the component (c) is 1 to 1
It is 5% by weight, preferably 2 to 10% by weight. Component (d): diempo having a hydroxyl group at a terminal
Rimmer or its hydrogenated product Used in automotive parts coated with the present invention
Diene having a hydroxyl group at the terminal of component (d) in the resin composition
As the polymer or its hydrogenated product, for example,
There is roxypolybutadiene. Specifically, there are few at the end
Both have one hydroxyl group and a molecular weight of 200 to 100,0
00, preferably 500-50,000, particularly preferred
Is liquid, semi-solid, solid at room temperature from 800 to 10,000
Of polymers. The average number of hydroxyl groups per molecule is
Generally 1.0 to 10.0, especially 1.5 to 5.0
Preferably, the hydroxyl value is generally between 15 and 250, preferably
Those having 25 to 125 (KOH mg / g) are preferred. The diene polymer having a hydroxyl group at a terminal is
Using 1,3-diene as a raw material, a known method, for example,
It can be manufactured by radical polymerization, anion polymerization, etc.
Can be. Specifically, for example, Japanese Patent Application Laid-Open No. 51-7139
The method described in Japanese Patent Laid-Open No. 1 can be exemplified. The above la
When manufacturing by the dical polymerization method, hydrogen peroxide
Polymerization of diene monomers using as initiator
Can be easily obtained. Further, according to the anionic polymerization method,
When producing conjugated dienes, conjugated dienes can be prepared according to well-known methods.
An anionic polymerization catalyst, such as an alkali metal or organic
Obtained by polymerizing with an alkali metal compound
Alkali metal bound to at least one of both ends
For example, monoepoxy compounds
Substance, formaldehyde, acetaldehyde, acetone,
Or halogenoalkylene oxide, polyepoxydi
Should be reacted. Raw monomers for these polymers
Uses at least one conjugated diene monomer
Is done. Conjugated diene monomers include 1,3-butadi
Ene, 1,3-pentadiene, isoprene, chloroprene
, 2,3-dimethyl-1,3-butadiene, 1-
Nyl-1,3-butadiene and the like can be mentioned. The diene polymer having a hydroxyl group at the terminal
As the hydrogenated product of the above, there is a di-terminal having a hydroxyl group at the above-mentioned terminal.
The enpolymer is prepared by a conventional method, for example, as described in JP-A-51-71.
The hydrogenation is carried out by the method described in
It can be obtained by Regarding the degree of hydrogenation,
Hydrogenate all or partly the double bond contained in the rimer
In particular, the iodine value is usually 0 to 2
0.0, particularly preferably 0 to 5.0 (g / 100 g)
New Diene polymers having hydroxyl groups at their terminals and
And their hydrogenated products, alone or in mixtures
Can also be used as The amount of component (d) is 0.01 to 10
% By weight, preferably 0.1 to 7% by weight, particularly preferably
0.5 to 5% by weight. The amount of component (d) is within the above range
If less, the reproducibility of paint adhesion is poor,
The degree is weak. The amount of component (d) is within the above range.
Exceeding the surroundings is not only uneconomical, but also results in
The paint strength is reduced,
Further, the strength as an automobile member cannot be maintained. Component (e): Filler Used in automotive parts coated with the coating of the present invention.
The filler of component (e) in the resin composition has an average particle size of 5 μm.
m or less, preferably 37,000 cm in specific surface area.
^Two / G or more, and substantially the entire length is 15 μm or less.
The average particle size is 0.8 to 2.2 μm and the average aspect ratio
Is 5 or more, the average particle size is 2 μm or less, and the average
Aluminum borate whiskers having a spectacle ratio of 5 or more;
Potassium titanate whisker, magnesium sulfate whisker
Scar (magnesium oxysulfate whisker:
MgSO4 / 5Mg (OH) 2.3H2O)
Select from tan whiskers and calcium carbonate whiskers
At least one type of filler
You. The talc used in the present invention is, for example,
Pulverize the stone with an impact mill or micron mill
After finely pulverizing with a micron mill and a jet type pulverizer,
Manufactured by classifying and adjusting with an ecron or micron separator
It was done. Here, raw talc is metal impurity from China
This is preferable because the amount of material components is small. Furthermore, the specific surface area is 37,
000cm ^Two / G, the average aspect ratio is less than 5,
When talc having an average particle size of more than 5 μm is used,
Impact strength and coating of automotive parts injection molded with resin composition
The appearance of the packaging is inferior and is not preferred. In whiskers,
If the average particle size exceeds 2 μm, the appearance of painted automotive parts
In addition, the dimensional stability at high temperatures is poor and unsuitable. Above all
It is more preferable to use LUC in combination with each of the whiskers. here
The average particle size is measured by the liquid phase sedimentation light transmission method.
Therefore, as a measuring device, for example, SA-manufactured by Shimadzu Corporation
There is a CP type, and the specific surface area is measured by the air permeation method.
As an example, the SS-100 model manufactured by Shimadzu Corporation
The aspect ratio is measured by microscopy or the like.
It is. These fillers are surfactants, coupling agents, etc.
Surface treatment may be applied to the
It is effective for improving the degree and paintability. Here, the component (e)
3 to 40% by weight, preferably 3 to 35 weight%
%, Especially 3 to 30% by weight. Component (e)
If the blending amount is less than the above range, the rigidity and dimensions
Poor legal stability. Exceeding the above range, coating of automotive parts
The appearance and impact strength are remarkably poor and unsuitable. (B) Additional components Used in automotive parts coated with the present invention.
The resin composition basically contains the above constituent components (essential components).
Although it is a combination, to further improve paintability
Other than the above-mentioned essential components (a) to (e)
In addition, the following additional components (components (f) and (g))
Can be blended. Component (f): Ethylene / unsaturated carboxylic acid copolymer Used in automotive parts coated with the present invention.
Ethylene / unsaturated carboxylic acid as component (e) in the resin composition
The copolymer is a copolymer of ethylene and an unsaturated carboxylic acid.
It is. As the unsaturated carboxylic acid, a compound having 3 to 3 carbon atoms
8, preferably 3 to 5 unsaturated carboxylic acids, specifically
Is acrylic acid, methacrylic acid, itaconic acid, maleic anhydride
Inic acid, maleic acid monomethyl ester, maleic acid
Noethyl ester or the like is used. These unsaturated cals
Among boronic acids, acrylic acid and methacrylic acid are particularly preferred.
Used. Ethylene used in the present invention
The carboxylic acid copolymer is composed of ethylene and unsaturated as described above.
It may contain a third component in addition to the carboxylic acid.
As the third component such as ethyl acrylate, acrylic
Isobutyl luate, normal butyl acrylate, methacrylate
Unsaturated carboxylic acid esters such as methyl luate, vinyl acetate
C4 to C9 carboxylic acids such as vinyl esters such as
Tell is used. These ethylene and unsaturated carboxylic acids
As the copolymer, the ethylene content is 50 to 99% by weight,
Preferably 70-98% by weight, and the unsaturated carboxylic acid
Present in an amount of 50-1% by weight, preferably 30-2% by weight
It is desirable to have. Also ethylene / unsaturated carb
Acid copolymer is ethylene component and unsaturated carboxylic acid component
When a third component is contained in addition to
0% by weight, preferably 0-30% by weight.
Is desirable. The amount of the component (e) is from 0 to 25% by weight.
%, Preferably 0.5 to 10% by weight. Component (g): Phosphorus oxyacid compound Used in automotive parts coated with the present invention.
The phosphorus oxyacid compound as the component (g) in the resin composition has a phosphorus atom
Structure in which an oxygen atom is directly bonded to the structure (phosphorus oxyacid structure)
And a phosphoric ester structure among them.
Preferably, it is particularly preferable to use acidic phosphorus.
Acid ester derivatives can be mentioned. Specific examples and
For example, monobutyl phosphate, dibutyl phosphate
, Di (2-ethylhexyl) phosphate, monophosphate
(Isodecyl) ester, di (isodecyl) phosphate
And mono (lauryl) phosphate. This
Here, the compounding amount of the phosphorus oxyacid compound as the component (g) is from 0 to 10
% By weight, preferably 0.1 to 7, particularly preferably 0.5
~ 5% by weight. If more than 10% by weight, balance of physical properties
And is unsuitable. (C) Optional Components The resin composition of the present invention usually contains a pigment for coloring.
To be blended or to improve other various performances,
Components (a) to (e), which are the essential constituents described above, and additional components
Optional components other than the components (components (f) and (g))
Can be. The optional components include an antioxidant, an antistatic
Additives such as antiseptics, flame retardants, dispersants, etc.
I can do it. Furthermore, within a range that does not significantly impair the effects of the present invention.
Various resins other than the above components (a) to (g)
Stormer, glass fiber, glass balloon, carbon fiber, etc.
Various fillers and the like can be blended. Among them, next
The straight-chain ethylene copolymer to be described is
Performance can be further improved.
It is particularly preferable among the components. Furthermore, light stability
As the agent, a benzoate compound or having a molecular weight of 500 or less
At least one selected from the above hindered amine compounds
Gives high weather resistance by adding seeds
be able to. When blending a light stabilizer, the
The total amount is 0.01 to 100 parts by weight of the whole composition.
2.5 parts by weight. [II] Production of molded article for automobile parts (1) Production of resin composition The automobile member coated with the present invention has the components (a) to
By blending each component of (g) according to the above quantitative ratio,
The obtained resin composition is subjected to a single screw extruder, a twin screw extruder,
Barry mixer, roll, Brabender plastgra
Kneading and granulation using a conventional kneader such as
Can be manufactured. Usually, the dispersion of each component is good.
It is necessary to select a kneading and granulation method to be improved.
The mixture is kneaded and granulated using a screw extruder. At this time, the component (a)
To (g) may be simultaneously kneaded, and the performance may be improved.
Each component is divided to achieve, for example, first, components (a) to
Part or all of component (e) is kneaded, and then
Knead and granulate by mixing the remaining components separately or simultaneously
You can do it. Kneading is generally performed at 190 to 250 ° C.
Or at a temperature of 200 to 240 ° C, generally 0.1 to 3
For about a minute. (2) Molding Using the resin composition thus obtained, various molding methods
Used in the present invention by molding by
Thus, an automobile member can be obtained. Molding is done in the usual way
Can do it. That is, injection molding, injection compression molding
Shape, compression molding, extrusion molding (sheet molding, blow molding), etc.
Any of these molding methods may be used.
Injection molding, injection compression molding (P
(Less injection). Ma
In addition, the molded article for automobile parts molded by the above-described method is curved.
Elasticity is 7,000kg / cm ^Two Above, preferably
7,500-30,000 kg / cm ^Two Especially preferred
Is 8,000-25,000 kg / cm ^Two Of
If the flexural modulus of the molded body is less than the above range,
The range of application as an automobile member is limited. The above molding
In order for the flexural modulus of the body to be above the range,
Restricting the blending of various elastomer components or blending fillers
It is obtained by controlling. (3) Surface condition of molded article for automobile parts Table for carbon atoms on the molded article surface molded by the above method
Surface oxygen atom concentration (O / C: atomic ratio) is 0.5% or more,
Preferably, it must be 0.7% or more. Here surface
The oxygen atom concentration is determined by X-ray photoelectron spectroscopy (XPS / ESC
Based on A), for example, ESCA 100 manufactured by Shimadzu Corporation
0 MgKα was used as an X-ray source by an X-ray photoelectron spectrometer.
Obtained by performing elemental analysis of the material surface using
It is. At this time, the oxygen atom concentration is defined as oxygen (O) atom and carbon
(C) means the abundance ratio of atoms (O / C), _1s Sensitivity officer
Number 1.00, O _1s Surface sensitivity assuming a sensitivity coefficient of 2.85
Data using the analysis data processing system ESPA 1000.
Data processing. Oxygen atom concentration (O
/ C: atomic ratio) is less than the above range, the paintability is insufficient.
It becomes. The range of the above surface oxygen atom concentration (O / C: atomic ratio)
In order to achieve the above requirements, the components (b), (c) and (d)
Control the properties and blending amount of component (f), depending on the case.
It is obtained by doing. [III] Coating The automotive member coated with the coating of the present invention has a surface
Apply paint directly to the surface to form a coating film directly on the surface of the molded body
It is obtained by doing. Direct coating on the surface of the molded body
As a coating method for forming
TCE degreasing, primer coating, plasma treatment, etc.
Steps excluding the surface modification step can be adopted. You
That is, directly on the automobile member molded with the resin composition,
A paint is applied. As a means of applying paint,
Spraying, brushing, roller coating
Although there are cloths, etc., any method is adopted in the method of the present invention.
be able to. Paints that can be used in the method of the invention
As paints that are generally widely used, for example,
Krill paint, epoxy paint, polyester paint,
Urethane paint, alkyd paint, melamine paint, etc.
Can be mentioned. Acrylic in these paints
Paint, polyester paint, urethane paint, alk
It is preferable to use pad paints and melamine paints.
The painted automotive parts of the present invention generally have a coating composition of 10-1.
Applied in a thickness of 00 μm, preferably 15-70 μm
The coating film has a residual number of usually 100 in a cross-cut adhesion test.
400 g / cm or more, especially 700 to 2,000 g /
cm, it is firmly adhered with a peel strength of
ー, door panel, bumper, spoiler, mat gar
Door, side molding, wheel cap, instrument
Sufficient coating performance for top panel and other automotive components
You. The thus obtained coated paint of the present invention
Molded body for automobiles made of conventional polypropylene resin
Unlike molded products, it is practical only by applying paint directly
Has enough coating strength and its flexural modulus is 7,000k
g / cm ^Two Above, preferably 7,500 to 30,000
kg / cm ^Two And particularly preferably 8,000 to 25,000.
0kg / cm ^Two And beautiful appearance, practical
Has good impact strength. EXAMPLES The present invention will be more specifically described with reference to the following experimental examples.
explain. The coating and evaluation methods performed here are shown below.
It is as follows. (1) Painting Paint Examples 1 to 7 and Comparative Examples 1 to 3 are acrylic melamine-based paints.
Example 8 uses a polyester urethane paint.
Painting. Painting method Mix each paint individually and use an air spray gun.
Spray so that the coating thickness is about 25 μm and 60 μm
-Coated. Baking process (2) Evaluation method (a) Evaluation of paint adhesion Crosscut test Apply a single-edged razor to the surface of the test specimen painted with a thickness of 25 μm.
11 vertical and horizontal parallel lines at 2mm intervals
Make 100 grids by drawing. Cellophane adhesive on it
(JIS-Z1522) is pressed tightly enough to
At about 30 degrees, peel off at a stretch and pull
Observe the state of the part surrounded by
The number was recorded. In addition, the hot water resistance test was performed using 4 painted test pieces.
The same evaluation was performed after immersion in hot water of 0 ° C. for 240 hours.
I decided to. Peel strength Apply a single-edged razor to the surface of the test specimen painted with a thickness of 60 μm.
Using a 1cm width to make a straight cut, the strip of the coating
At a speed of 20 mm / min with a tensile tester (180 °
Pull it upside down) and read the load when peeling off.
Was. (B) Evaluation of mechanical strength Flexural modulus It was measured in accordance with JIS K-7203. The measurement temperature is
23 ° C. Izod impact strength (with cutting notch) Measure according to JIS K-7110 (cutting notch)
Was. The measurement temperature is -30C. (C) Measurement of Surface Oxygen Concentration Determined by X-ray photoelectron spectroscopy (XPS / ESCA)
You. : ESCA 1000 X-ray photoelectron component manufactured by Shimadzu Corporation
Material surface using MgKα as X-ray source by optical device
Is determined by performing elemental analysis of Oxygen atom concentration
The degree is the presence of oxygen (O) and carbon (C) atoms on the material surface
Means ratio (O / C), C _1s Sensitivity coefficient of 1.00,
O _1s Data for surface analysis with a sensitivity coefficient of 2.85
Data processing using System ESPA 1000
Put out. Examples 1 to 7 and Comparative Examples 1 to 2 Component (a), component (b), component (c), component (d) below
(e), component (f) and component (g) are blended in the ratio shown in Table 1.
And tetrakis [methylene-3- (3 ', 5'-di
-T-butyl-4'-hydroxyphenyl) propione
Methane) to 100 parts by weight of the total amount of components (a) to (g)
0.1 parts by weight with respect to each other.
Were sufficiently mixed (however, the filler component (e) -2
The whisker part is excluded.
Feed). After that, use a twin screw extruder manufactured by Kobe Steel
After kneading and granulating under a temperature condition of 215 ° C.,
The whisker part of the filler component (e) -2 is extruder
Feeding was done separately from the latter half. ) Remove the pellet
Supply to the Crew In-line type injection molding machine to measure physical properties
Test specimen and paintability evaluation sheet (120 mm × 120
mm × 3 mmt) at a temperature of 210 ° C. and evaluated.
Was. The molding cycle in this case was a total of 45 seconds and 5 seconds respectively.
It was 0 seconds. Table 1 shows the evaluation results. Ingredient (a) Ethylene-soluble at room temperature xylene with an ethylene content of 35% by weight
%, The total ethylene content is 3% by weight, and the MFR is
30g / 10min propylene / ethylene block
Polymer Component (b) b-1: Mooney viscosity ML _{1 + 4} (100 ° C) is 25,
Ethylene / propylene copolymer with 26% by weight of propylene
Rubber b-2: Mooney viscosity ML _{1 + 4} (100 ° C) 88
Ethylene / propylene / ethyl with propylene content 28% by weight
Ridennorbornene terpolymer rubber b-3: styrene content 20% by weight, MFR (230 ° C.,
2.16 kg) 20 g / 10 min styrene / ethylene /
Butylene / styrene block copolymer Component (c) c-1: Mooney viscosity ML _{1 + 4} (100 ° C) is 5 or less
(Not measurable), MFR 45 g / 10 min, propylene content
25% by weight ethylene / propylene copolymer rubber c-2: Mooney viscosity ML _{1 + 4} (100 ° C) is 5 or less
(Not measurable), MFR 70 g / 10 min, propylene content
23% by weight of an ethylene / propylene copolymer rubber Component (d) A butadiene having a molecular weight of about 2,9
00, manufactured by hydrogenating a diene polymer having a hydroxyl value of about 84
The iodine value was 1.0 (g / 100 g) and the hydroxyl value was 8
Hydrogenation of 3.7 (KOHmg / g) diene polymer
Component (e) e-1: specific surface area is 39,800 cm ^Two / G, substantially
The total length is 10 μm or less, and the average particle size is 1.8.
talc e-2 having an average aspect ratio of 6 μm: an average diameter of 0.6 μm and an average aspect ratio of 6
Aluminum borate whisker of 35 Component (f) Acrylic acid content is 15% by weight and MFR (190 ° C.,
2.16 kg) is 7 g / 10 min.
Component (g) Di (2-ethylhexyl) phosphate and di (2-ethyl phosphate)
Table 1 1: 1 mixture of ethylhexyl) esters As shown in Table 1, the compositions shown in Examples 1 to 7
The resin composition with
Nevertheless, practically enough coating strength and mechanical strength
Had a degree. On the other hand, Comparative Examples 1 to 2 What is shown in
In each case, the paintability or mechanical strength was insufficient. Example 8 Using the same resin composition as in Example 1, treatment before painting
With a polyester urethane paint without any
And evaluated. The number of grids attached is 10
0/100, with a peel strength of 1,020 g / cm
Was. The resin composition molded article of the present invention has a specific composition.
Use of propylene-based resin composition
Et al., Resin composition molded with conventional polypropylene resin
Unlike a molded product, it is practically sufficient to apply paint directly.
With sufficient coating strength and sufficient mechanical strength for practical use
Fenders, door panels, bumpers, spoi
Roller, mat guard, side molding, wheel cap
For automobile parts such as lamps and instrument panels
Simplifying the painting process, improving the working environment, and reducing costs
Can be achieved.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-179100 (JP, A) JP-A-5-43748 (JP, A) JP-A-3-277636 (JP, A) JP-A-4-199 198232 (JP, A) JP-A-4-216832 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J ⁷ /04-7/06 C08L 1/00-101/16

Claims (1)

(57) [Claims] [Claim 1] The following components (a), (b), (c), (d) and
(e) In some cases, a resin composition composed of each component having one or both of component (f) and component (g) as an essential component is used as a raw material, and X-ray photoelectron spectroscopy (XPS / ESC
When the concentration of oxygen atoms with respect to carbon atoms on the surface of the molded body measured by A) is 0.5% or more, the flexural modulus is 7,000.
A coated automotive member, characterized in that a coating film is formed directly on the surface of a molded article for automotive parts that satisfies the condition of being not less than kg / cm ² . Component (a): contains 4 to 30% by weight of a room temperature xylene-soluble component having an ethylene content of 20 to 70% by weight, has an MFR of 1 to 200 g / 10 minutes for the whole copolymer, and has an ethylene content of 3 to 3%. Component (b): at least one elastomer selected from ethylene-based elastomers and styrene-based elastomers Component (b): 10 to 50% by weight Component (c): Mooney viscosity ML _{1 + 4} (100 ° C.) is 5 or less, MFR (230 ° C., 2.16 kg) is 30 g / 10 min or more, and propylene content is 20 to 35% by weight. d): a diene polymer having a hydroxyl group at a terminal or a hydrogenated product thereof 0.01 to 10% by weight Component (e): talc having an average particle size of 5 μm or less, an average particle size of 2 μm or less and Aluminum borate whiskers with an average aspect ratio of 5 or more, potassium titanate whiskers, magnesium sulfate whiskers (magnesium oxysulfate whiskers: MgSO4.5Mg (OH) 2.3H2O), titanium oxide whiskers, and calcium carbonate whiskers At least one kind of filler 3 to 40% by weight Component (f): Ethylene / unsaturated carboxylic acid copolymer 0 to 25% by weight Component (g): Phosphorus oxyacid compound 0 to 10% by weight