JP2002249635A - Polypropylene resin composition for car exterior and car side molding composed by molding the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polypropylene resin composition excellent in high fluidity, physical properties, dimensional stability, moldability and appearance of its molded article, and a component for car exterior composed by molding this composition. SOLUTION: Prescribed amount of the following components are compounded Component A: a polypropylene resin [die swell ratio (ME)<=1.1] extruded by using an extruder a product composed by melting and kneading a propylene.ethylene block copolymer in which MFR(melt flow rate) of a propylene homopolymer part ranges 250-350 g/10 min and that of the block copolymer ranges 100-140 g/10 min and to which 0.0005-0.005 wt.% peroxide is compounded. Component B: an ethylene.octene random copolymer in which MFR ranges 4-20 g/10 min and the density ranges 0.870-0.880 Component C: an ethylene.butene random copolymer in which MFR ranges 4-20 g/10 min and the density ranges 0.855-0.865 Component D: talc the average particle size of which is 10 μm or less measured by a laser diffraction method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polypropylene resin composition having excellent fluidity, dimensional stability, moldability, void properties, and weld appearance, and an automobile exterior member obtained by molding the composition.

[0002]

2. Description of the Related Art Propylene homopolymer, ethylene
A composite material composed of a polypropylene-based resin such as a propylene random copolymer and an ethylene-propylene block copolymer has excellent mechanical properties, economy, and dimensional stability, and has been applied to automobile side moldings and the like. For example, JP-A-7
-314490, JP-A-9-12805,
JP-A-9-241441, JP-A-2000-959
A propylene-based resin composition such as that disclosed in Japanese Patent Application Laid-Open No. 19-193 is known. However, in recent years, with the improvement of the production cycle and the rationalization of the parts cost, there has been a demand for a material having a higher flow rate, a lower coefficient of linear expansion, less voids in the molded product, and a good weld appearance.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide high fluidity, good physical properties, dimensional stability, and the like. An object of the present invention is to provide a polypropylene-based resin composition having excellent moldability and molded appearance, and an automobile exterior member formed by molding the composition.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies with the aim of solving the above-mentioned problems, and as a result, a propylene / ethylene block copolymer and a trace amount of peroxide were melted by an extruder. By mixing a specific ethylene-octene random copolymer, ethylene-butene random copolymer and talc to the kneaded polypropylene resin, high fluidity, and good physical properties, dimensional stability,
The present inventors have found that a polypropylene-based resin composition excellent in moldability and appearance and an automobile exterior member obtained by molding the composition can be obtained, and have completed the present invention.

That is, according to the present invention, the following component (A) is 35 to 55% by weight, component (B) is 15 to 25% by weight,
Component (C) is 5 to 15% by weight and component (D) is 20 to 2%.
5% by weight and a total of 45% by weight or more of the component (B), the component (C) and the component (D), and the physical properties of the composition are as follows: MFR: 230 ° C., 2.16 kg load) 45 g / 1
A polypropylene resin composition for automotive exterior materials characterized by having a flexural modulus of 1600 MPa or less and a linear expansion coefficient of 5.7 × 10 ⁻⁵ cm / cm · ° C. or less for 0 minutes or more. Component (A): MFR of propylene homopolymer portion is 25
0 to 350 g / 10 min, MFR of the block copolymer is 1
The peroxide is added to the propylene / ethylene block copolymer at a rate of 0.0005 to 140 g / 10 min.
A blend of 0.005% by weight was melt-kneaded with an extruder. A polypropylene resin having a die swell ratio (ME) of 1.1 or less. Ethylene-octene random copolymer having a viscosity of 0.870 to 0.880 (C) component: ethylene-butene random copolymer having an MFR of 4 to 20 g / 10 min and a density of 0.855 to 0.865 ( D) Component: talc having an average particle size of 10 μm or less measured by a laser diffraction method.

Hereinafter, the components (A) to (D) will be described. Component (A): Polypropylene resin The propylene / ethylene block copolymer used in the polypropylene resin (A) has an MFR of 100 to 140 g.
/ 10 minutes is used. When the MFR of the propylene / ethylene block copolymer is less than the above range, the fluidity becomes insufficient. On the contrary, when the MFR of the propylene / ethylene block copolymer exceeds the above range, the void appearance is inferior. The void is a phenomenon that creates a vacuum space inside a molded product, and the generation of a void causes a problem of a defective product.

The propylene homopolymer portion of the propylene / ethylene block copolymer has an MFR of 250 to 35.
It is 0/10 minutes. If the MFR of the propylene homopolymer portion of the propylene / ethylene block copolymer is less than the above range, the fluidity becomes insufficient and the MFR
However, if it exceeds the above range, the void characteristics are inferior. The ethylene content in the propylene / ethylene block copolymer is
Usually, it is 1 to 10% by weight, preferably 2 to 8% by weight.

The propylene / ethylene block copolymer has a die swell ratio (ME: 190 ° C., L / D = 8).
However, what is 1.1 or less is used. If the ME of the propylene / ethylene block copolymer exceeds the above range, the weld appearance will be poor. Here, the die swell ratio (ME) is one of the product characteristics when the resin is extruded from the pores into a strand, and will be described in detail in Examples.

In the production of the propylene / ethylene block copolymer, a highly stereoregular catalyst is used. As the catalyst, a titanium trichloride composition obtained by reducing titanium tetrachloride with an organoaluminum compound and further treating with various electron donors and electron acceptors is combined with an organoaluminum compound and an aromatic carboxylic acid ester. Methods (JP-A-56-100806, JP-A-56-1207)
No. 12, JP-A-58-104907),
And a method for a supported catalyst in which titanium tetrachloride and various electron donors are brought into contact with magnesium halide (Japanese Patent Laid-Open No.
-63310, JP-A-63-43915, JP-A-63-43915
3-83116) can be exemplified. Gas phase fluidized bed, solution process in the presence of the catalyst,
It is obtained by polymerizing using propylene and ethylene by applying a production process such as a slurry method.

The amount of the above-mentioned propylene / ethylene block copolymer to be compounded is 3 in the propylene resin composition of the present invention.
0 to 55% by weight. If the amount is less than the above range, the fluidity is poor. If the amount exceeds the above range, rigidity is increased, linear expansion coefficient is increased, and dimensional stability is poor.

In the preparation of the component (A), propylene
As the peroxide to be added to and mixed with the ethylene block copolymer, an organic peroxide or an inorganic peroxide can be exemplified. Specific examples of the organic peroxide include benzoyl peroxide, t-butyl perbenzoate, and t-butyl perbenzoate.
Butyl peracetate, t-butyl peroxyisopropyl carbonate, 2,5-di-methyl-2,5-di-
(Benzoylperoxy) hexane, 2,5-di-methyl-2,5-di- (benzoylperoxy) hexyne-
3, t-butyl-di-peradipate, t-butylperoxy-3,5,5-trimethylhexanoate, methyl-ethylketone peroxide, cyclohexanone peroxide, di-t-butyl peroxide, dicumyl Peroxide, 2,5-di-methyl-2,5-di- (t-butylperoxy) hexane, 2,5-di-methyl-2,5-di- (t-butylperoxy) hexyne-3 1,3-bis- (t-butylperoxyisopropyl) benzene, t-butylcumyl peroxide,
1,1-bis- (t-butylperoxy) -3,3,5
-Trimethylcyclohexane, 1,1-bis- (t-butylperoxy) cyclohexane, 2,2-bis- (t
-Butylperoxy) butane, p-menthane hydroperoxide, di-isopropylbenzene hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide, p-cymene hydroperoxide, 1,1,3,3-tetra -Methylbutyl hydroperoxide, 2,5-di-methyl-2,5
-Di- (hydroperoxy) hexane and the like. These may be used alone or in any combination of two or more. Of these, preferred are 2,5-di-methyl-2,5-di- (t-butylperoxy) hexane and 2,5-di-methyl-2,5-di- (t-butylperoxy). ) Hexin-3,1,3-bis- (t-butylperoxyisopropyl) benzene, particularly preferred is 1,3-bis- (t-butylperoxyisopropyl) benzene. Specifically, potassium persulfate, ammonium persulfate, barium peroxide and the like can be used as the inorganic peroxide, but an organic peroxide is preferred from the viewpoint of the thermal decomposition temperature.

The amount of the peroxide is 0.00
It is adjusted to be from 0.5 to 0.005% by weight. The compounding amount is 0.
If the content exceeds 005% by weight, the flowability of the obtained polypropylene resin composition for automotive exterior materials is improved, but the void property is inferior. If the content is less than 0.0005% by weight, the weld appearance is inferior. Selected from a limited range.

Component (B): Ethylene / octene random copolymer As the ethylene / octene random copolymer, an ethylene copolymer also called an ethylene / octene elastomer or an ethylene / octene copolymer rubber is used. 60-70% by weight, octene content 30-
Those with 40% by weight are preferred.

The density of the ethylene / octene random copolymer is 0.870 to 0.880 g / cm ³ . The density is a value measured according to JIS-K7112. If it exceeds 0.880 g / cm ³ , there arises a problem that the linear expansion coefficient becomes large and the dimensional stability is lacking. MF
R is in the range of 4 to 20 g / 10 minutes from the viewpoint of balancing the fluidity of the obtained automobile exterior member and the moldability during injection molding. When the MFR exceeds 20 g / 10 minutes, the fluidity is improved, but the void property is inferior. If it is less than 4 g / 10 minutes, the coefficient of linear expansion becomes large, resulting in a disadvantage that the dimensional stability is lacking. The use of the above-mentioned ethylene / octene random copolymer is not limited to one kind, but may be a mixture of two or more kinds having different densities and MFRs.

In the production of the ethylene / octene random copolymer, a titanium compound such as a titanium halide, a vanadium compound, an organic aluminum-magnesium complex such as an alkylaluminum-magnesium complex, an alkylalkoxyaluminum complex, an alkylaluminum, or A so-called Ziegler-type catalyst such as alkylaluminum chloride can be polymerized by a metallocene compound described in WO-91 / 04257 and the like, but a more preferable copolymer is obtained particularly when polymerized using a vanadium compound and a metallocene compound. . As the polymerization method, polymerization can be performed by applying a production process such as a gas-phase fluidized bed, a solution method, and a slurry method.

The blending amount of the ethylene / octene random copolymer in the resin composition of the present invention is adjusted to 15 to 25% by weight. If the amount is less than 15% by weight, the fluidity is less reduced, but the rigidity is high, the linear expansion coefficient is large, and the dimensional stability is poor.

Component (C): Ethylene / butene random copolymer As the ethylene / butene random copolymer, an ethylene-based copolymer also called an ethylene / butene elastomer or an ethylene / butene copolymer rubber is used. Those having 65 to 75% by weight and a butene content of 25 to 35% by weight are preferred.

The density of the ethylene / butene random copolymer is 0.855 to 0.865 g / cm ³ . 0.8
If it exceeds 65 g / cm ³ , there occurs a problem that the coefficient of linear expansion increases and the dimensional stability is lacking. The MFR is in the range of 4 to 20 g / 10 minutes from the viewpoint of balancing the fluidity of the obtained automobile exterior member and the moldability during injection molding. When the MFR exceeds 20 g / 10 minutes, the fluidity is improved, but the void property is inferior. In less than 4 g / 10 minutes,
The linear expansion coefficient becomes large, and the dimensional stability is poor. Further, the use of the above-mentioned ethylene / butene random copolymer is not limited to one kind, and the density, M
It may be a mixture of two or more different types such as FR.
The method for producing the ethylene / butene random copolymer is the same as that for the ethylene / octene random copolymer described above.

Ethylene / butene random copolymer (C)
Is adjusted to 5 to 15% by weight. 15% by weight
If it exceeds, the resulting rigidity of the resin composition for automotive exterior materials is excellent, but the fluidity is reduced. If it is less than 5% by weight, the decrease in fluidity is small, but the rigidity is increased and
The linear expansion coefficient becomes large, and the dimensional stability is poor.

(D) Talc Talc having an average particle size of 10 μm or less as measured by a laser diffraction method is used. The measurement of the average particle size is based on JIS
It is measured according to R1620 and can be determined by a particle size analyzer (for example, LA920W manufactured by Horiba, Ltd.). If the average particle size exceeds 10 μm, the linear expansion coefficient becomes large, resulting in a problem of lack of dimensional stability.

The amount of talc is adjusted to 20 to 25% by weight. If it exceeds 25% by weight, the dimensional stability of the resulting polypropylene resin composition for automotive exterior materials is good, but the rigidity of the material itself is too high. If the content is less than 20% by weight, the linear expansion coefficient becomes large and the dimensional stability is poor.

The talc having an average particle size of 10 μm or less can be obtained by mechanically pulverizing naturally produced talc and classifying it more precisely. Further, the material once coarsely classified may be further classified. As a method of mechanical pulverization, pulverization can be performed using a pulverizer such as a jaw crusher, a hammer crusher, a roll crusher, a screen mill, a jet pulverizer, a colloid mill, a roller mill, and a vibration mill. These milled talcs are adjusted to the average particle size indicated in the present invention,
Once or repeatedly, wet or dry classification is performed using a cyclone, a cyclone air separator, a micro separator, a cyclone air separator, a sharp cut separator or the like. In particular, it is preferable to perform a classification operation using a sharp cut separator. These talc, for the purpose of improving the adhesiveness or dispersibility with the polymer, various organic titanate-based coupling agent, organic silane coupling agent, unsaturated carboxylic acid, or a modified polyolefin grafted with an anhydride thereof, Those surface-treated with fatty acids, fatty acid metal salts, fatty acid esters and the like may be used.

The amounts of the components (A) to (D) in the polypropylene resin composition for automotive exterior materials according to the present invention are, as described above, 35-55% by weight of the component (A) and (B) The component is selected from a range of 15 to 25% by weight, and the component (C) is selected from a range of 5 to 15% by weight.
The component (B), the component (C) and the component (D) are prepared such that the total amount of the components is 45% by weight or more. 45% by weight
If it is less than 1, a problem occurs that the linear expansion coefficient becomes large and the dimensional stability is lacking.

In the polypropylene resin composition of the present invention, if necessary, other additional components other than the above-mentioned essential components (A) to (D) may be added as long as the effects of the present invention are not significantly impaired. Can be arbitrarily added. Such additional components include phenolic and phosphorus antioxidants,
Hindered amine-based, benzophenone-based, benzotriazole-based weathering deterioration inhibitor, nucleating agent such as organic phosphorus compound,
Dispersants represented by metal salts of stearic acid, coloring substances such as quinacridone, perylene, phthalocyanine, titanium oxide, carbon black, etc .; whiskers such as fibrous potassium titanate, fibrous magnesium oxysulfate, fibrous aluminum borate, calcium carbonate, etc. And substances such as carbon fiber and glass fiber.

Hereinafter, a method for producing the polypropylene resin composition will be described. (1) Kneading The polypropylene-based resin composition of the present invention is obtained by uniformly mixing and kneading the above-mentioned components (A) to (D). Although there is no particular limitation on the method, dry blending is performed using a commonly used mixer such as a Henschel mixer or a tumbler, and a single-screw extruder, a twin-screw extruder, a Banbury mixer, a roll, a Brabender plastograph, a kneader, or the like is used. It is manufactured by kneading at a set temperature of 180 to 250 ° C. Among these, it is preferable to manufacture using an extruder, especially a twin-screw extruder.

(2) Molding The molding method of the polypropylene resin composition of the present invention is as follows.
Although not particularly limited, an injection molding method, an injection compression molding method that is generally performed in the synthetic resin field,
It is molded by applying a molding method such as a hollow molding method. In view of the effect of the invention to be achieved, it is suitable to use the injection molding method. Particularly, since it has excellent fluidity, it is advantageously applied to the production of products having a thin and long shape.

The polypropylene resin composition of the present invention produced by the above method has good workability at the time of injection molding and exhibits the following physical properties such as excellent flexural modulus and linear expansion coefficient.
And achieves a good molded appearance. (A) MFR: 45 g / 10 min or more (b) Flexural modulus: 1600 MPa or less (c) Linear expansion coefficient: 5.7 × 10 ⁻⁵ cm / cm · ° C. or less

The automobile exterior member of the present invention is obtained by applying various molding methods such as injection molding to the above-mentioned polypropylene-based resin composition of the present invention. Specifically, the ratio of the length L to the thickness t (L / t)
Are widely used as side moldings (front side moldings and rear side moldings) for automobiles having a thin and long shape having a thickness of 200 or more, over fenders and the like.

[0029]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof. In addition, the measuring method in an Example and the raw material used in the Example are as follows. [I] Measurement method (1) Die swell ratio (ME): The temperature in the cylinder of the melt indexer is set to 190 ° C. As the orifice, length 8.00mm, inner diameter 1.00mmφ, L / D
= 8. Also, a graduated cylinder containing ethanol immediately below the orifice is placed at a position where the distance between the orifice and the ethanol level is 20 ± 2 mm. In this state, the sample is put into a cylinder, and the load is adjusted so that the amount of extrusion per minute is 0.1 ± 0.03 g. 6
After 7 minutes from the extrudate, the extrudate is dropped into ethanol and solidified before being collected. Measure the maximum value and the minimum value of the diameter of the strand-shaped sample of the extruded material at three places of 1 cm from the top, 1 cm from the bottom, and the center,
The average value of the diameter measured at a total of six locations was defined as the ME value.

(2) Melt flow rate (MFR): A
Based on STM-D1238, 2 with a 2.16 kg load
It was measured at a temperature of 30 ° C. (3) Density: based on JIS K7112 (4) Flexural modulus: 23 based on JIS K7203
(5) Linear expansion coefficient: According to the method specified in JIS K7197, temperature rise rate 2 ° C./min, load 4 kPa, measurement range 2
The test was performed at 5 to 80 ° C. (unit: × 10 ⁻⁵ cm / cm ·)
° C). In this evaluation, it can be said that the smaller the coefficient of linear expansion, the better the dimensional stability.

(6) Weld appearance: A flat model molded product having a thickness of 4 mm provided with an opening as shown in FIG.
And the visibility of the weld appearance of part A was visually judged. The criteria were the following three ranks. ：: Weld part is not noticeable △: Weld part is noticeable ×: Weld part is noticeable (7) Void properties: A 4 mm-thick plate model molded article having an opening as shown in FIG. Injection molding was performed, and the number of voids generated therein was determined.

[II] Raw material (1) Polypropylene resin (A) A predetermined amount of 1,3-bis (t-butylperoxy) is added as a peroxide to a propylene / ethylene block copolymer having different MFR and ethylene content. Isopropyl)
After mixing benzene with a super mixer (manufactured by Kawada Seisakusho) for 5 minutes, a continuous kneader (KCM50 manufactured by Kobe Steel) and an extruder (KE65 manufactured by Kobe Steel) were connected, and the temperature was 210 ° C.
(KCM50) and 250 ° C. (KE65) were kneaded and granulated at a set temperature to obtain a polypropylene resin composition. Table 1 shows the physical properties of the starting materials and the die swell ratio (ME) after melt-kneading with the peroxide.

[0033]

[Table 1]

(2) Ethylene / α-olefin random copolymer Ethylene / octene random copolymer (component (B)) and ethylene / butene random copolymer (component (C))
Are collectively referred to as an ethylene / α-olefin random copolymer. The ethylene-octene random copolymer is α
—Olefin is shown as octene, and ethylene-butene random copolymer is shown as α-olefin as butene. Table 2 shows the MFR and density of each component.

[0035]

[Table 2]

(3) Table 3 shows the average particle size of talc (D).

[0037]

[Table 3]

Examples 1 to 3 and Comparative Examples 1 to 10
The raw materials shown in Tables 1 to 3 were blended at the composition ratios shown in Table 4.
Further, 0.1 part by weight of tetrakis [methylene-3- (3′5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane (IRGANOX1010 manufactured by Ciba-Geigy) and 100 parts by weight of stearin After mixing 0.3 parts by weight of magnesium oxide and mixing with a super mixer (manufactured by Kawada Seisakusho) for 5 minutes, the mixture is kneaded and granulated with a twin-screw kneader (KCM50 manufactured by Kobe Steel) at a set temperature of 210 ° C. As a result, a polypropylene resin composition was obtained. Thereafter, various test pieces were prepared at a molding temperature of 210 ° C. using an injection molding machine having a mold clamping pressure of 100 tons, and the measurement was performed in accordance with the various measurement methods described above. Table 5 shows the evaluation results.

[0039]

[Table 4]

[0040]

[Table 5]

As is clear from the evaluation results in Table 5, Comparative Examples 1 and 6 have lower MFR and lower fluidity than Comparative Examples of the present invention, and Comparative Example 3 has too high a flexural modulus and Comparative Example 2 ,
7, 9, and 10 have a large coefficient of linear expansion and are inferior in dimensional stability.
Comparative Example 4 was inferior in weld appearance, and Comparative Examples 5 and 8
Is inferior in void properties. The cause is that at least one of the components is out of the requirements described in the claims of the present invention, and the necessity of the requirements can be understood.

[0042]

As described above, according to the present invention,
Specific ethylene-octene random copolymer, ethylene-butene random copolymer,
Since talc is appropriately selected and used, it is possible to provide a polypropylene-based resin composition for an automotive exterior material having excellent moldability and molded appearance. That is, since the resin composition for an automotive exterior material of the present invention has such excellent properties, a molded article using the resin composition as a raw material can be advantageously applied to the production of an automobile side molding as shown in FIG.

[Brief description of the drawings]

FIG. 1 is a molded product for measuring weld appearance and void characteristics.

FIG. 2 is a sectional view showing a mold used for injection molding of an automobile side molding.

FIG. 3 is a perspective view of a cavity mold used for injection molding of an automobile side molding.

FIG. 4 is a bottom view of an automobile side molding.

FIG. 5 is a sectional view of an automobile side molding.

FIG. 6 is a top view of an automobile side molding.

FIG. 7 is a side view showing an automobile using an automobile side molding.

[Explanation of symbols]

 1. Flat plate molded product 2. Gate 3. Opening 4. 4. cavity mold Core mold 6. Cavity part 7. Gate section 8. Runner section 9. Hot runner section 10. Rib 11. Fender side mall 12. Front door side mall 13. Rear door side mall A. Weld line

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 3/34 C08K 3/34 // (C08L 53/00 (C08L 53/00 23:08) 23:08 ) B29K 23:00 B29K 23:00 B29L 31:30 B29L 31:30 (72) Inventor Yukihito Zanhua 1 Tohocho, Yokkaichi-shi, Mie Japan Polychem Corporation Material Development Center (72) Inventor Mihiro Murayama No. 1, Toho-cho, Yokkaichi-shi, Mie Japan Polychem Corporation Material Development Center (72) Inventor Kentaro Iwanaga 3-36 Imaikecho, Anjo-shi, Aichi Pref. Inoac Corporation Anjo Plant (72) Inventor Kazuto Kadori Tsukasa Fukui (Innoac Corporation Sakurai Office) 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi ) 3D023 AA01 AB01 AC01 AC02 AD02 AD22 4F070 AA12 AA13 AA15 AB08 AB11 AC56 AE08 FA03 FB06 FB07 FC03 FC05 4F071 AA15X AA21X AA75X AA76X AA88X AB26 AD02 AE17 AF20Y AF62Y AH07 AH02 A0107B01 A0107 EK037 EK047 EK057 FD016 FD147 GN00

Claims (3)

[Claims] (1) 35 to 55% by weight of component (A), 15 to 25% by weight of component (B), and 5 to 25% by weight of component (C) shown below.
15% by weight and 20 to 25% by weight of the component (D);
A resin composition containing at least 45% by weight of the total of the component (B), the component (C) and the component (D), and the physical property of the composition is 45 g of a melt flow rate (MFR).
/ 10 minutes or more, a flexural modulus of 1600 MPa or less, and a linear expansion coefficient of 5.7 × 10 ⁻⁵ cm / cm · ° C. or less. Component (A): MFR of propylene homopolymer portion is 25
0 to 350 g / 10 min, MFR of the block copolymer is 1
The peroxide is added to the propylene / ethylene block copolymer at a rate of 0.0005 to 140 g / 10 min.
A blend of 0.005% by weight is melt-kneaded by an extruder. A polypropylene resin having a die swell ratio (ME) of 1.1 or less. Component (B): MFR is 4 to 20 g / 10 minutes, and density is 0. Ethylene-octene random copolymer having a viscosity of 0.870 to 0.880 (C) component: ethylene-butene random copolymer having an MFR of 4 to 20 g / 10 min and a density of 0.855 to 0.865 ( D) Component: talc having an average particle size of 10 μm or less measured by a laser diffraction method. 2. A vehicle exterior member obtained by injection molding the polypropylene resin composition for vehicle exterior material according to claim 1. 3. A length L with respect to a thickness t obtained by molding the polypropylene resin composition for an automotive exterior material according to claim 1.
A side molding for a vehicle having a thin and long shape having a ratio (L / t) of 200 or more.