JPH093274A - Bumper for vehicle - Google Patents

Abstract

PURPOSE: To obtain a bumper for vehicle comprising a resin composition obtained by blending a specific phosphorus compound with a specific propylene- based polymer and an ethylene-propylene copolymer, excellent in rigidity and impact resistance and having a low linear expansion coefficient. CONSTITUTION: This bumper comprises a resin composition obtained by blending (A) 40 to 85wt.% of a propylene homopolymer or art ethylene-propylene copolymer of which ethylene content is <=10mol%, with (B) 15 to 60wt.% of an ethylene-propylene copolymer of which ethylene content is 15 to 90mol% and (C) 0.005 to 5 pts.wt [based on 100 pts.wt components (A)+(B)] of a compound of the formula [R1 is a direct bond, S or a 1-14C (cyclo)alkylidene; R2 and R3 are each H or a 1-18C (cyclo)alkyl; M is a metal; n is 1-6 as a valence of M].

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new vehicle bumper made of a polypropylene resin composition.

[0002]

2. Description of the Related Art In recent years, polypropylene-based resins have been widely used as a raw material for bumpers for vehicles such as automobiles from the viewpoints of lightness, moldability and recyclability. This is because by blending polypropylene with an ethylene-propylene copolymer (EPR) and an inorganic filler and compounding them, a material having both high rigidity and impact resistance, which was insufficient with polypropylene polymer alone, can be obtained. It depends on how it became.

On the other hand, the coefficient of linear expansion is the most important characteristic in the design of a vehicle bumper. That is, when there is a large difference between the linear expansion coefficient of metal (1 × 10 ⁻⁵ cm / cm K) and the linear expansion coefficient of resin, a gap is created between the body and the bumper, resulting in a poor appearance.

The coefficient of linear expansion of polypropylene resin is generally as large as 12 × 10 ⁻⁵ cm / cm · K, and when it is used as a bumper, as described above, due to the fluctuation of the outside temperature, it becomes There is a gap in the surface and the appearance is poor.

Further, a means for controlling the linear expansion coefficient of the polypropylene resin by controlling the internal structure of the resin molding has been proposed, but the effect of reducing the linear expansion coefficient by such means is not sufficient. However, the physical properties as a material for the bumper were not sufficiently satisfied.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bumper which is made of polypropylene resin and has a reduced coefficient of linear expansion while maintaining the rigidity and impact resistance of the resin. is there.

[0007]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive research to solve such problems.

As a result, a resin composition obtained by adding a specific phosphate compound to a specific resin composition has an extremely low coefficient of linear expansion and is excellent in rigidity and impact resistance, and is a bumper for vehicles. As a result, they have found that they are extremely useful, and have completed the present invention.

That is, the present invention provides (1) 40 to 85% by weight of a propylene homopolymer and / or an ethylene-propylene copolymer having an ethylene content of 10 mol% or less (hereinafter, also referred to as PP component), and ( 2) 15 to 60% by weight of an ethylene-propylene copolymer having an ethylene content of 15 to 90 mol% (hereinafter, also referred to as an EP component), and the total amount of the polymers of (1) and (2) above 100 parts by weight. On the other hand, it is a vehicle bumper (hereinafter, also simply referred to as a bumper) made of a resin composition containing 0.005 to 5 parts by weight of the phosphate compound represented by the following general formula [I].

[0010]

Embedded image

(Wherein R ₁ represents a direct bond, a sulfur atom or an alkylidene group having 1 to 14 carbon atoms or a cycloalkylidene group, and R ₂ and R ₃ each represent a hydrogen atom or the same or different kind having 1 to 18 carbon atoms. Is an alkyl group or a cycloalkyl group, M is a metal atom, and n is an valence of the metal atom and is an integer of 1 to 6.) The PP component of the polymer composition constituting the bumper of the present invention is Propylene homopolymer and / or ethylene content is 1
It is an ethylene-propylene copolymer of 0 mol% or less. Here, when an ethylene-propylene copolymer is used as the PP component, the copolymer may be either a block copolymer or a random copolymer, but in consideration of rigidity and impact resistance, the block copolymer may be used. Polymers are preferred. Further, as the PP polymer, a propylene homopolymer and the block copolymer may be used alone,
You may mix and use it in arbitrary ratios.

When the ethylene content (content of the polymer portion of ethylene) in the ethylene-propylene copolymer used as the PP component exceeds 10 mol%, the effect of reducing the coefficient of linear expansion due to the action with the phosphate compound decreases. It is not preferable because Further, in order to exert the effect of reducing the linear expansion coefficient more within the above range, the ethylene content is more preferably 8 mol% or less.

As the PP component, those produced by a known method can be used without particular limitation as long as they have the above-mentioned characteristics.

Of these, the PP component has a melt flow index (MI) of 5 to 100 and a flexural modulus of 100.
Those of 0 N / mm ² or more are preferably used.

The EP component of the polymer composition of the present invention is an ethylene-propylene copolymer having an ethylene content of 15 to 90 mol%. That is, when the ethylene content of the EP component is less than 15 mol%, and 90 mol%
If it exceeds, the effect of improving the impact resistance of the bumper is not sufficient and the object of the present invention cannot be achieved. The EP
The content of the components is more preferably 20 to 80 mol% for improving the impact resistance.

The EP component has a flexural modulus of 200 N.
Particularly preferred is an elastomer having a flexibility of not more than / mm ² .

The method for producing the EP component used in the composition of the present invention is not particularly limited, but, for example, by copolymerizing ethylene and propylene and, if necessary, a non-conjugated diene with a Ziegler type catalyst. Obtainable.

Examples of the non-conjugated diene include cyclopentadiene, tricyclopentadiene and 5-methyl-2,5.
-Norbornadiene, 5-methyl-2-norbornene,
5-ethylidene-2-norbornene, 5-isopropenyl-2-norbornene, 5-isopropylidene-2-norbornene, cyclooctadiene, vinylcyclohexene, 1,5,9-cyclododecatriene, 1,4-hexadiene, 1 , 6-octadiene, 1,7-octadiene,
Examples thereof include 1,8-nonadiene, 1,9-decadiene, 3,6-dimethyl-1,7-octadiene, and the like, with preference given to 5-ethylidene-2-norbornene and cyclopentadiene.

The EP component is composed of a vanadium compound and / or a titanium compound in a hydrocarbon solvent and a periodic table I.
It can also be produced using a catalyst composed of a group IV organic metal compound.

Among these, as the vanadium compound, trivalent to pentavalent vanadium soluble in an inert organic solvent is preferably used, and halides of vanadium, oxyhalides, chelate complexes with oxygen-containing compounds, vanadic acid esters, etc. Is preferred. More specifically, vanadium tetrachloride, vanadium oxytrichloride, vanadium tris acetylacetate, vanadic acid trisethoxide, vanadate tri-n
-Butoxide, vanadic acid tri-n-butoxymonochloride, vanadium tetrachloride and / or a reaction composition of vanadium oxytrichloride and alcohol, and the like. These are used alone or as a mixture of two or more kinds.

As the titanium compound, a titanium trichloride catalyst dissolved in a solid or a solvent, or a titanium trichloride or titanium tetrachloride compound supported on magnesium chloride or the like is used. It is also possible to use these compounds in combination with a third component such as an electron donor.

The method for producing the copolymer using the above titanium compound is not particularly limited, but the following methods can be given as examples of methods that can be suitably adopted.

That is, the following components A and B, or further C and / or DA A: titanium compound B: organoaluminum compound C: electron donor D: iodine compound represented by the general formula (i) RI (i (However, R is an iodine atom or an alkyl group having 1 to 7 carbon atoms or a phenyl group.) Prepolymerization of propylene in the range of 0.1 to 500 g-polymer / g-titanium compound. To obtain a catalyst-containing prepolymer,
Then, in the presence of the catalyst-containing prepolymer, 1-butene is polymerized and propylene is polymerized, and then random copolymerization of a mixture of propylene and ethylene is sequentially performed to obtain a high molecular weight powder, and further an organic peroxide. The method of decomposing is preferable.

The above-mentioned manufacturing method is described in JP-A-5-320468.
The details are described in Japanese Patent Publication No.

In the above method, when the propylene-ethylene random copolymer component is polymerized, the propylene-based monomer unit in the copolymer is 20 to 85 m.
ol%, preferably 40-85 mol% and ethylene-based monomer units 15-80 mol%, preferably 1
5 to 60 mol%, more preferably 20 to 50 mol
It is recommended to mix propylene and ethylene so as to be in the range of%.

The molecular weight distribution (Mw / Mn) represented by the ratio of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the EP component used in the present invention is 1.0 to 8, preferably It is preferably 1.5 to 5, more preferably 1.5 to 4. If the Mw / Mn is less than 1.0, it is difficult to produce it using a Ziegler-based catalyst, while if it exceeds 8, the coefficient of linear expansion of the resulting composition tends to increase.

As the phosphate compound represented by the above general formula [I] used in the present invention, the alkylidene group represented by R ₁ is methylene, ethylidene, isopropylidene,
Butylidene, hexylidene, cyclohexylidene, octylidene, nonylidene, cyclooctylidene, and R
_The alkyl group represented by ₂ and R ₃ is methyl, ethyl,
Isopropyl, n-butyl, isobutyl, s-butyl,
t-butyl, n-amyl, t-amyl, hexyl, heptyl, n-octyl, 2-ethylhexyl, t-octyl, nonyl, decyl, undecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl group, cycloalkyl group, cyclopentyl, Cyclohexyl, cyclohexyl, cycloheptyl, cyclooctyl, 1-methylcyclohexyl group, the metal atom represented by M is Li, N
a, K, Be, Mg, Ca, Sr, Ba, Zn, Cd,
Al, Ge, Sn, Pb, Ti, Zr, Sb, Cr, B
i, Mo, Mn, Fe, Co, Ni, particularly preferably L
Group Ia metals such as i, Na and K, Mg, Ca, Sr and Ba
Examples of the phosphate compounds include Group IIa metals such as Al and Group IIIb metals such as Al. The phosphate compound is not particularly limited, but an example of the compound is 2,2-methylenebis (4,6-di-t-butylphenyl) phosphate represented by the following formula [II].
Sodium and the like can be mentioned.

[0028]

Embedded image

In the present invention, the proportion of the PP component in the polymer composed of the PP component and the EP component is 40 to 85% by weight. When the proportion of the PP component is less than 40% by weight, the coefficient of linear expansion becomes large and the object of the present invention cannot be achieved. Further, even when the proportion of the PP component exceeds 85% by weight, not only the coefficient of linear expansion increases but also the impact resistance decreases, so that the object of the present invention cannot be achieved.

Considering the effect of reducing the coefficient of linear expansion and impact resistance, the PP component is 60 to 80% by weight and the EP component is 20% by weight.
It is particularly preferable that the content is ˜40% by weight.

Further, in the present invention, in order to further enhance the rigidity of the obtained vehicle bumper, it is preferable to add an inorganic filler. The mixing ratio of the inorganic filler is P
It is 1 to 30 parts by weight based on 100 parts by weight of the P component and the EP component. When the proportion of the inorganic filler is less than 1 part by weight, the effect of enhancing the rigidity is insufficient, and when the proportion of the inorganic filler exceeds 30 parts by weight, the effect of reducing the linear expansion coefficient and the impact resistance. Sex tends to decrease. Further, in consideration of the effect of reducing the linear expansion coefficient and the impact resistance, the compounding ratio of the inorganic filler is preferably 3 to 25 parts by weight.

In the present invention, the filler preferably used is, for example, calcium carbonate, glass beads, silica, clay, talc, mica, glass flake, glass fiber,
Examples thereof include wollastonite, barium sulfate, potassium titanate and the like. Among them, those containing a plate-like, needle-like, or fibrous filler are preferable because the coefficient of linear expansion is reduced.

Further, in the above polymer composition, when 3 to 25 parts by weight of talc having an average particle size of 10 μm or less to 0.7 μm or more is used as an inorganic filler, the coefficient of linear expansion is not impaired without impairing impact resistance. It is more preferable because it can be reduced. Considering the coefficient of linear expansion and impact resistance, the mixing ratio of talc is 5
Most preferably, it is 15 parts by weight.

Further, in the present invention, the phosphate compound represented by the general formula [I] is added in an amount of 0.005 to 100 parts by weight based on the total amount of the above-mentioned PP component and EP component.
It is mixed in a ratio of 5 parts by weight. Such compounding amount is 0.00
If it is less than 5 parts by weight, the effect of reducing the linear expansion coefficient in combination with the polymer component is not sufficient. On the other hand, even if added in excess of 5 parts by weight, the effect of reducing the linear expansion coefficient is saturated, which is economically disadvantageous. Considering the effect of reducing the linear expansion coefficient, it is particularly preferably 0.05 to 3 parts by weight.

In the present invention, another type of polymer may be contained within a range that does not significantly impair the rigidity and impact resistance of the polymer composition. The addition amount is 40 parts by weight or less, particularly 30 parts by weight or less, based on 100 parts by weight of the total amount of the polymer,
Further, it is preferably 10 parts by weight or less.

The above-mentioned other kinds of polymers to be added are not particularly limited, but examples thereof include high-density polyethylene, low-density polyethylene, linear polyethylene, ethylene-butene copolymer, and propylene-butene copolymer. Examples include polymer, polybutene-1, polybutadiene, polystyrene, styrene-butadiene copolymer, hydrogenated styrene-butadiene copolymer, hydrogenated styrene-isoprene copolymer and the like.

Furthermore, the polymer composition further comprises
Antioxidants, antistatic agents, lubricants, ultraviolet absorbers, pigments and the like, which are additives used in general polymers, may be contained.

In the present invention, the method for producing the polymer composition constituting the bumper is not particularly limited. As a typical production method, for example, after blending the respective components constituting the polymer composition, mixed by a mixer such as a tumbler, a mixer, a gelation mixer, and then,
A method of melt kneading and granulating in a temperature range of 180 to 300 ° C. using a single-screw or twin-screw extruder can be adopted.

In the present invention, the bumper manufacturing method is also as follows:
Although a general molding method can be used without any restriction, it is most preferable to perform molding by injection molding, gas-assisted injection molding, compression molding and blow molding. It is also possible to directly add the above-mentioned respective components in a mixed state to a molding machine as a material for a bumper.

The structure and shape of the molded body of the bumper of the present invention are not particularly limited, and solid bodies, hollow bodies, laminated bodies and the like can be manufactured without any limitation.

[0041]

EFFECT OF THE INVENTION The bumper of the present invention has a coefficient of linear expansion of 8 × 10 ⁻⁵ cm / in spite of being a polypropylene resin composition.
It is as small as cm · K or less, and has excellent rigidity and impact resistance.

Therefore, when it is mounted on the body of an automobile, it does not cause distortion between itself and the steel plate due to temperature changes, and has good designability and shock absorption. Further, it has excellent properties such as light weight, moldability and recyclability, and is extremely useful industrially.

[0043]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

In the examples and comparative examples, the weight average molecular weight, linear expansion coefficient, flexural modulus, Izod impact value, vehicle body mounting test and falling ball impact strength test method are as follows.

(1) Weight average molecular weight It was measured by the gel permeation chromatography (GPC) method. Water-based GPC-150 was performed at 135 ° C. using o-dichlorobenzene as a solvent. The column used was TSK gel GMH6 manufactured by Tosoh Corporation.
-HT, gel size 10-15 μm. The calibration curve has a weight average molecular weight of 950, 290 as a standard sample.
0, 10,000, 50,000, 49.8 million, 2.7 million and 6.75 million polystyrenes were used.

(2) Coefficient of linear expansion It was performed according to JIS K7197. The test apparatus is TMA100 manufactured by Seiko, and the load is 1 g, and the measurement temperature range is -3.
It was carried out at 0 to 80 ° C.

(3) Flexural Modulus The flexural modulus was determined according to ASTM D-790.

(4) Izod impact strength It was performed at 23 ° C. according to ASTM D-256.

(5) Vehicle body mounting test A bumper was prepared by injection molding. After mounting the obtained bumper on the vehicle body, raise the temperature to 80 ° C at 2 ° C / min, and
After the lapse of time, the state of close contact between the vehicle body and the bumper at the same temperature was observed. As a result, those having a clearance of less than 2 mm from the vehicle body were marked with ◯, those having a clearance of 2 mm or more and less than 5 mm were marked with Δ, and those having a clearance of 5 mm or more were marked with x.

(6) Falling ball impact strength Using a DuPont impact tester, a steel plate adhesion test was carried out under the conditions of a hammer 1/4 inch R, a hammer cradle 3/2 inch R, a load of 5 kg and a load drop height of 1 m. Identical test piece used-
After the condition was adjusted to 30 ° C., the test piece was placed on a strike core base and a strike core was applied to drop the load. As a result, those that did not break or crack were represented by O, those that cracked were represented by Δ, and those that had broken were represented by X.

Further, the propylene homopolymer used as the PP component in Examples and Comparative Examples (hereinafter referred to as H-PP
Abbreviated) and an ethylene-propylene block copolymer (hereinafter abbreviated as B-PP), an ethylene-propylene copolymer used as an EP component (hereinafter abbreviated as EPR), an inorganic filler (hereinafter referred to as a filler). (Abbreviation) is as follows.

H-PP: polypropylene manufactured by Tokuyama Corporation ME180: MI = 30 g / 10 min, ethylene content 0 mol% B-PP: polypropylene SH6 manufactured by Tokuyama Corporation
80: MI = 30 g / 10 min, ethylene content
3.3 mol% EPR-1: manufactured by the following method.

(Preliminary Polymerization) A glass autoclave reactor having an internal volume of 1 liter equipped with a stirrer was sufficiently replaced with nitrogen gas, and then 400 ml of heptane was inserted. Keeping the temperature inside the reactor at 20 ° C., diethylene glycol dimethyl ether 0.18 mmol, ethyl iodide 22.7 mm
ol, diethyl aluminum chloride 18.5mmo
l, and titanium trichloride (TOS-
17 ") 22.7 mmol was added, and then propylene was continuously introduced into the reactor for 30 minutes so that the amount of propylene was 3 g per 1 g of titanium trichloride. The temperature during this period was kept at 20 ° C. After stopping the supply of propylene, the inside of the reactor was sufficiently replaced with nitrogen gas, and the obtained titanium-containing polypropylene polymer was washed with purified heptane four times. As a result of the analysis,
2.9 g of propylene was polymerized per 1 g of titanium trichloride.

(Main Polymerization) Step 1: Polymerization of 1-butene A stainless autoclave reactor having an internal volume of 1 liter equipped with a stirrer was sufficiently replaced with nitrogen gas, and then 400 ml of heptane was inserted. Keeping the temperature inside the reactor at 20 ° C, diethylene glycol dimethyl ether 0.18 m
mol, ethyl iodide 22.7 mmol, diethylaluminum chloride 18.15 mmol, titanium-containing polypropylene obtained by prepolymerization was added as titanium trichloride, and 22.7 mmol was added, and 1-butene was added to 50 g per 1 g of titanium trichloride. Thus, it was continuously introduced into the reactor for 2 hours. The temperature during this period was kept at 20 ° C. 1
-After stopping the supply of butene, the inside of the reactor was sufficiently replaced with nitrogen gas to obtain a titanium-containing poly-1-butene polymer.
As a result of the analysis, 14 g of 1-butene was polymerized per 1 g of titanium trichloride.

Step 2: Copolymerization of Propylene-Ethylene A stainless steel autoclave reactor having an internal volume of 2 liters was sufficiently replaced with nitrogen gas, then 1 liter of liquid propylene and 0.70 mmo of diethylaluminum chloride.
1 was added and the internal temperature of the autoclave was raised to 60 ° C.
0.087 mmol of titanium-containing 1-polybutene polymer was added as titanium trichloride, and propylene was polymerized at 60 ° C. for 10 minutes. During this time, hydrogen was not used. Then, the internal temperature of the autoclave is rapidly lowered to 55 ° C., and at the same time, ethyl aluminum sesquiethoxide (EtAl (O
Et) ₂ ) 0.50 mmol and a mixed solution of 0.014 mmol of methyl methacrylate were added and ethylene was supplied so that the ethylene gas concentration in the gas phase would be 8 mol%, and propylene and ethylene were mixed at 55 ° C. for 2 hours. Polymerization was carried out. During this period, the ethylene gas concentration was maintained at 8 mol% while confirming with a gas chromatograph.

During this time, hydrogen was not used. After polymerization,
Unreacted monomer was purged to obtain a fine particle polymer. No adhesion was observed in the polymerization tank or on the stirring blade.
The yield was 146 g, and the polymerization ratio of all polymers was 6900.
It was g-polymer / g-titanium trichloride. Table 1 shows the results
It was shown to.

[0057]

[Table 1]

Then, to 30 kg of the obtained polymer, 1,3-bis- (t-butylperoxyisopropyl) benzene was added as an organic peroxide in a ratio shown in Table 2, and
Add 0.1 phr of antioxidant, mix for 1 minute with Henschel mixer, and 230 ℃ with 50φmm single screw extruder.
Melt-kneading was carried out under the conditions described above to obtain MI and Mw / Mn pellets shown in Table 2.

EPR-2: 1-of EPR-1 production method
Production of EPR-1 except that the polymerization amount of 1-butene was 15 g per 1 g of titanium trichloride in the polymerization of butene, and the ethylene gas concentration was 12 mol% in the copolymerization of propylene and ethylene. The same operation as the method was performed. The results are shown in Table 1. Further, the same amount of organic peroxide as shown in Table 2 was melt-kneaded in the same manner as in the production method of EPR-1.

EPR-3: manufactured by Mitsui Petrochemical Tuffmer S4030: MI = 0.4 g / 10 min, ethylene content 45 mol% EPR-4: manufactured by Nippon Synthetic Rubber EP02P: MI = 3.
0 g / 10 min, ethylene content 76 mol% EPR-5: In the propylene polymerization of the EPR-1 production method, in the copolymerization of propylene and ethylene, the ethylene gas concentration was 2 mol%
The same operation as in the method for producing R-1 was performed. The results are shown in Table 1.

Further, the same amount of organic peroxide as shown in Table 2 was melt-kneaded in the same manner as in the production method of EPR-1.

Filler-1: Asada Milling Fine talc
MMR: average particle size 1.0 μm

[0063]

[Table 2]

Examples 1 to 3 Ethylene content 3.3 mol%, MI 30 g / 10 mi
n, a propylene-ethylene copolymer (B-PP),
Ethylene content 23mol%, MI 4g / 10mi
n, flexural modulus 80 N / mm ² , ethylene-propylene copolymer (EPR-1) having a molecular weight distribution of 2.1, talc (filler-1) having an average particle size of 1.0 μm, phosphoric acid 2,2 -Methylenebis (4,6-di-t-butylphenyl)
Sodium (Asahi Denka Kogyo product name: ADEKA STAB NA-
11, abbreviated as compound-1 in the table) at a ratio shown in Table 3 and a cylinder temperature of 250 ° C. in a φ45 mm twin-screw extruder.
Was melt-kneaded.

A bending test piece and an Izod impact test piece were produced from the obtained composition by a 50 ton injection molding machine under the conditions of a cylinder temperature of 190 ° C. and a mold temperature of 30 ° C. After leaving these for 48 hours at room temperature, the linear expansion coefficient and the flexural modulus were measured using a bending test piece, and the impact value was measured using an Izod impact test piece. In addition, the composition
Ton injection molding machine, cylinder temperature 190 ℃, mold temperature 30 ℃, thickness about 3mm, width about 65mm, length 1
A 700 mm bumper was produced. This was heat stabilized at 80 ° C. for 1 hour. Further, after standing at room temperature for 48 hours, a vehicle body mounting test and a falling ball impact strength measurement were performed.

The results are shown in Table 3.

Example 4 In Example 1, the propylene-ethylene block copolymer was replaced with an ethylene content of 0 mol% and an MI of 30 g /
A test was conducted in the same manner as in Example 1 except that 10 min of propylene homopolymer (H-PP) was used. The results are shown in Table 3.

Examples 5-7 In Example 1, the ethylene content was changed to 3 instead of EPR-1.
5 mol%, MI 4g / 10min, flexural modulus 40N
/ Mm ² , ethylene-propylene copolymer having a molecular weight distribution of 2.3 (EPR-2), ethylene content 45 mol% M
I is 0.4 g / 10 min, flexural modulus is 30 N / m
m ² , ethylene-propylene copolymer having a molecular weight distribution of 4.6 (EPR-3), ethylene content 76 mol%, MI
Of 3 g / 10 min, flexural modulus of 40 N / mm ² and molecular weight distribution of 2.3 (E-propylene copolymer (E
A test was conducted in the same manner as in Example 1 except that PR-4) was used. The results are shown in Table 3.

Examples 8-10 In Example 1, 2,2-methylenebis (4,6) phosphate was used.
Table 3 shows the blending ratio of -di-t-butylphenyl) sodium.
A test was conducted in the same manner except that the ratio was set to. The results are shown in Table 3.

Examples 11 to 13 Tests were conducted in the same manner as in Example 1 except that the mixing ratio of the filler-1 was changed to the ratio shown in Table 3. The results are shown in Table 3.

[0071]

[Table 3]

Comparative Examples 1 to 3 In Example 1, B-PP, EPR-1 and phosphoric acid 2,
A test was performed in the same manner as in Example 1 except that the mixing ratio of 2-methylenebis (4,6-di-t-butylphenyl) sodium was changed to the ratio shown in Table 4. The results are shown in Table 4.

Comparative Examples 4 to 6 In Example 1, the ethylene content was changed to 1 instead of EPR-1.
2 mol%, MI 6 g / 10 min, flexural modulus 200
N-mm ² , ethylene-propylene copolymer having a molecular weight distribution of 2.0 (EPR-5), 2,2-methylenebis (4,6-di-t-butylphenyl) sodium phosphate, para-t Aluminum butylbenzoate (trade name: AL-PTBBA * 500 manufactured by Shell Chemical Co., Ltd., abbreviated as compound-2 in the table) and 1,3-2,4-di (paramethylbenzylidene) sorbitol (trade name manufactured by Shin Nippon Rika Co., Ltd .: Tests were carried out in the same manner as in Example 1 except that Geol MD, abbreviated as compound-3 in the table) was used. The results are shown in Table 4.

Comparative Example 7 A test was conducted in the same manner as in Example 1 except that the mixing ratio of the filler-1 was changed to the ratio shown in Table 4. The results are shown in Table 4.

[0075]

[Table 4]

Claims (2)

[Claims] (1) 40-85% by weight of a propylene homopolymer and / or an ethylene-propylene copolymer having an ethylene content of 10 mol% or less, and (2) an ethylene-propylene having an ethylene content of 15-90 mol%. The phosphate compound represented by the following general formula [I] is added in an amount of 0.005 to 5 with respect to 15 to 60% by weight of the copolymer and 100 parts by weight of the total amount of the polymers of (1) and (2). A vehicle bumper made of a resin composition mixed in a ratio of parts by weight. Embedded image (In the formula, R ₁ is a direct bond, a sulfur atom or a carbon number of 1 to 1.
4 represents an alkylidene group or a cycloalkylidene group, wherein R ₂ and R ₃ are each a hydrogen atom or a carbon number of 1 to 1.
8 are the same or different alkyl groups or cycloalkyl groups of 8, M is a metal atom, and n is an valence of the metal atom and is an integer of 1 to 6. ) 2. The total amount of the polymers (1) and (2) is 10
The vehicle bumper according to claim 1, comprising a resin composition in which an inorganic filler is mixed in an amount of 1 to 30 parts by weight with respect to 0 parts by weight.