JP5843781B2 - Impact resistant polyolefin composition - Google Patents

Description

The present invention relates to an impact resistant thermoplastic polyolefin composition. In particular, the present invention relates to a composition comprising a propylene polymer component, a copolymer of two or more ethylenes and a C ₃ -C ₁₀ -α-olefin.

  In the technology of thermoplastic polymer compositions, to achieve a good balance of stiffness (high flexural modulus) and impact resistance, propylene polymers, generally homopolymers of propylene polymers or copolymers with small amounts of comonomers Combining elastomeric ethylene copolymers is known. It is also desirable to achieve heat shrinkage for certain applications. In fact, these properties provide high form stability to the final products obtained from these compositions.

In particular, WO 03/075511 and WO 2005/121240 include a copolymer of a propylene polymer component, ethylene and one or more C ₄ -C ₁₀ -α-olefins, other elastomeric or plastomer based polyolefins and mineral fillers. Polyolefin compositions with low heat shrinkage and excellent mechanical properties are described. As shown in the examples of these documents, using the technical solution disclosed therein, flexural modulus significantly greater than 1000 MPa only when about 20 wt% mineral based filler is added. A value is obtained. Also, the melt flow rate (MFR) of these high flexural modulus compositions is relatively small.

WO03 / 075511 WO2005 / 121240

Select a specific propylene polymer and ethylene / alpha-olefin copolymer, other characteristics, by combining the ratio of the various components, the desired mechanical properties (especially flexural modulus and Aizo' preparative impact strength) of the balance of the composition It was revealed that low glossiness, favorable fluidity in the molten state, and low heat shrinkage can be achieved.

  Due to their mechanical and physical properties, the polyolefin compositions according to the invention are used in particular in the automotive field, in particular in the manufacture of door trims.

Accordingly, the present invention is all expressed in weight percent,
A) 50-85%, preferably 60-80%, of a polypropylene component consisting of a propylene homopolymer, a propylene copolymer with other α-olefins, or combinations thereof,
The polypropylene component contains at least 85% by weight of propylene, has an MFR-L value of 110 g / 10 min or more, preferably 120 g / 10 min or more, and preferably 2500 g / 10 min at the maximum, to xylene at room temperature Having a solubility of less than 20% by weight;
B) a copolymer of ethylene and one or more C ₄ -C ₁₀ -α-olefins containing 3 to 20%, preferably 2 to 15%, 15 to 35% C ₄ -C ₁₀ -α-olefins. The solubility in xylene at room temperature is greater than 50% by weight and the intrinsic viscosity of the xylene soluble fraction is preferably 2.5-4 dl / g;
C) a copolymer component comprising 10 to 35%, preferably 10 to 25%, of one or more ethylene and propylene copolymers and optionally 0.5 to 5% by weight of diene, with an ethylene content of 60% or more A polyolefin composition comprising: a solubility in xylene at room temperature of greater than 50% by weight, and an intrinsic viscosity of the xylene-soluble fraction, preferably 2-4 dl / g,
The amounts of A), B) and C) are values relative to the total weight of A) + B) + C)
Weight ratio _B 2 / _{C 2} in ethylene content _{C 2} of the ethylene content _{B 2} and C) in in B) is 1.4 or less, preferably 1.3 or less, more preferably 1.2 or less, the lower limit Relates to a polyolefin composition wherein is preferably 0.8.

  From the above definition it is clear that "copolymer" includes polymers containing multiple types of comonomers.

  If necessary, the composition according to the invention can comprise a mineral filler D).

  However, it is not necessary to add a large amount of filler. On the contrary, it is preferable to add a very small amount of such a filler, that is, 0.3 to 5 parts by weight of the mineral filler D) with respect to 100 parts by weight of A) + B) + C). .

  The compositions according to the invention may also contain nucleating agent E) if necessary in an amount of 0.01 to 0.5 parts by weight, preferably 100 parts by weight of A), B) and C) and if necessary D) Can be included.

  The MFR value of the composition of the present invention is preferably 20 g / 10 min or more, or 25 g / 10 min or more, for example in the range of 20-60 g / 10 min, in particular in the range of 25-60 g / 10 min.

  Therefore, the composition of the present invention can be easily converted into various kinds of final products and semi-finished products by injection molding method due to its relatively high MFR value and the above balanced properties.

  The mixing of various propylene homopolymers and / or copolymers with different MFR-L values determines the MFR-L value of component A).

In such cases, the MFR-L value of A) is derived from the correlation between the MFR of the known polyolefin composition and the MFR of each component, based on the amount of the single polymer and the MFRL value, respectively. For example, in the case of the bipolymer components A ¹ and A ² , this correlation is expressed as:
ln MFR ^A = [WA ¹ / ( WA ¹ + WA ² )] × ln MFR ¹ + [WA ² / (WA ¹ + WA ² )] × ln MFR ²
Where WA ¹ and WA ² represent the weights of the components A ¹ ) and A ² ), respectively, MFR ^A represents the calculated MFR of A), MFR ¹ and MFR ² represent the components A ¹ ) and A ² ), respectively. Represents the MFR of A ² ).

Therefore, the MFR-L value of a single polymer is less than 100 g / 10 min. Therefore, the definition of the MFR-L value of component A) includes the above calculated value. The amount of fraction (XI) insoluble in xylene at room temperature of component B) preferably satisfies the following formula:

(XI) <1.14 × B ₂ −34

Wherein, B ₂ in the amount of ethylene in component B), is obtained in weight percent relative to the weight of B).

The amount of component (A) soluble in xylene at room temperature is 20% or less, preferably 10% by weight or less, as described above. Usually component (A) comprises (i) a propylene homopolymer, preferably having a solubility in xylene at room temperature of less than 10% by weight, more preferably less than 5%, even more preferably less than 3%, (ii) propylene and at least Selected from a copolymer of a kind of α-olefin of the formula H ₂ CH═CHR, wherein R is H or a C _2-8 linear or branched alkyl group, or a combination of (i) and (ii) It is.

  Preferably the copolymer of propylene (ii) comprises at least 90% propylene and its solubility in xylene at room temperature is preferably less than 15% by weight, more preferably less than 10%, even more preferably less than 8% . The α-olefin is preferably ethylene, butene-1, pentene-1,4-methylpentene-1, hexene-1, octene-1, or a combination thereof, and more preferably propylene ( The copolymer of ii) is a copolymer of propylene and ethylene.

  As mentioned above, components (B) and (C) are partially soluble in xylene at room temperature. The content of the component (B) or (C) soluble in xylene at room temperature is preferably about 50 to 95% by weight, more preferably 55 to 95% by weight.

The C ₄ -C ₁₀ -α-olefin in component (B) is generally an olefin of formula H ₂ CH═CHR where R is a C _2-8 linear or branched alkyl group. ). Representative examples of the C ₄ -C ₁₀ -α-olefin of component (B) include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene and 1-octene. Is particularly preferred.

  The composition of the present invention can be produced by melt blending components (A), (B) and (C), and if necessary, components (D) and / or (E).

All compositions of the present invention are expressed in weight percent,
A ^I) 60 from 85%, a propylene homopolymer, a propylene copolymer or polypropylene component comprising a combination of these, with other α- olefins, comprising at least 85 wt% propylene, MFR-L values 20g / 10 minutes or more, and the solubility in xylene at room temperature is less than 20% by weight;
B ^I ) a copolymer of 15-40% ethylene and one or more C ₄ -C ₁₀ -α-olefins, containing 15-35% by weight C ₄ -C ₁₀ -α-olefins, to xylene at room temperature A masterbatch composition (I) having a solubility greater than 50% by weight and an intrinsic viscosity of the xylene soluble fraction of 2.5 to 4 dl / g is mixed with other polyolefin components and, if necessary, component (D ) And / or (E).

The preferred polymer type and comonomer type and amount for the masterbatch component (A ^I ) and the fraction soluble in xylene at room temperature are the same as those described above for component (A).

The type and amount of comonomer for the masterbatch component (B ^I ) and the amount of fraction soluble in xylene at room temperature are the same as those described above for component (B).

  The DSC melting peak melting enthalpy value ΔHm that can be detected at a temperature between 100 and 130 ° C. of the masterbatch composition (I) is preferably 1 J / g or more.

  In general, components (A), (B) and (C) can be produced separately by known polymerization methods.

  The masterbatch composition (I) is preferably produced by sequential polymerization. Specifically, the masterbatch composition (I) is produced in a separate process in which components (A) and (B) are continuous, and the first process is a previous process. It is preferred to produce by sequential polymerization consisting of at least two sequential steps performed in separate steps except that it is performed in the presence of the polymer formed and the catalyst used. This catalyst is added only in the first step, but its activity is so high that it is maintained in all subsequent steps.

  This polymerization may be continuous or batchwise, but in a known manner, in the liquid phase in the presence or absence of an inert diluent, or in the gas phase, or gas-liquid mixing Done by law.

  However, the reaction time, pressure, and temperature of these polymerization steps are not so important, but the temperature is highest when the temperature is 50 to 100 ° C. The pressure may be atmospheric pressure or higher.

The molecular weight is adjusted with known regulators, in particular with hydrogen.
The polymerization is preferably performed in the presence of a stereoselective Ziegler-Natta catalyst. This catalyst is known.

Known conventional molecular weight self-adjusting agents such as chain transfer agents (eg hydrogen or ZnEt ₂ ) can be used. Examples of preferred Ziegler-Natta catalysts include supported catalyst systems comprising a trialkylaluminum compound and, if necessary, an electron donor, Ti halides or halogen-alcolates supported on anhydrous magnesium chloride and, if necessary, an electron donor compound. Examples of the solid catalyst component include. Catalysts having the above characteristics and polymerization methods using such catalysts are well known in the patent literature. Particularly preferred are the catalysts and polymerization processes described in USP 4,399,054 and EP-A-45977. Other examples are found in USP 4,472,524.

These catalysts can also be contacted in advance with a small amount of olefin (prepolymerization). If necessary, the mineral filler (D) added to the composition of the present invention includes talc, CaCO ₃ , silica, mica, wollastonite (CaSiO ₃ ), clay, diatomaceous earth, titanium oxide, and zeolite. Talc is preferred. Usually, the mineral filler is in the form of particles having an average diameter in the range of 0.1 to 5 micrometers.

  Useful nucleating agents (E) include, for example, metal salts of carboxylic acids, dibenzyl sorbitol derivatives, alkali metal salts of phosphoric acid, and the like. Specific examples of the nucleating agent include sodium benzoate, aluminum adipate, aluminum pt-butylbenzoate, 1,3,2,4-dibenzylidene sorbitol, 1,3,2,4-bis (p -Methyl-benzylidene) sorbitol, 1,3,2,4-bis (p-ethylbenzylidene) sorbitol, 1,3-p-chlorobenzylidene-2,4-p-methylbenzylidene) sorbitol, sodium bis (4-t -Butylphenyl) phosphate, sodium bis (4-t-methylphenyl) phosphate, potassium bis (4,6-di-t-butylphenyl) phosphate, sodium 2,2'-methylene-bis (4,6-di-) t-butylphenyl) phosphate, sodium 2,2′-ethylidene-bis (4,6-di-t-butylpheny ) Phosphate, and the like.

  The composition of the present invention may also contain conventionally used additives such as antioxidants, light stabilizers, heat stabilizers, colorants and the like.

  As mentioned above, the composition of the present invention can be obtained by melt blending components (A), (B) and (C), if necessary, components (D) and / or (E), or a masterbatch composition (I ) May be melt blended with other polyolefin components and, if necessary, components (D) and / or (E). Any known mixing device equipped with a mixer such as a closed mixer or an extruder can be used. For example, a Banbury mixer or a single screw bus extruder or a twin screw Maris type or Werner type extruder can be used.

  The present invention also provides a final product, in particular a door trim comprising the above polyolefin composition.

  The practice and advantages of the present invention are illustrated in the following examples. These examples are for illustrative purposes only and do not limit the scope of the invention in any way.

The following analytical methods are used to evaluate the properties of the polymer composition.
Melt flow rate (MFR): ASTM-D1238, condition L (ie 230 ° C., 2.16 kg load)
[Η] Intrinsic viscosity: measured in tetrahydronaphthalene at 135 ° C. Content of ethylene and butene: R. Spectroscopic flexural modulus: ISO178
Tensile strength at break: ISO 527
Elongation at break: ISO 527
Notched Izod impact test: ISO180 / 1A
Glossiness

Ten rectangular test pieces (55 × 60 × 1 mm) of each polymer to be tested were produced by injection molding under the following conditions using an injection press / Batterenfeld BA500CD.
Screw speed: 120rpm
Back pressure: 10 bar
Mold temperature: 40 ℃
Melting temperature: 260 ° C
Injection time: 3 seconds First residence time: 5 seconds
Second residence time: 5 seconds Cooling time (after second residence time): 10 seconds
The value of the injection pressure needs to be sufficient for the mold to be completely filled within the above time.

  The ratio of the light beam reflected from the surface of the measurement specimen was measured with a gloss meter at an incident angle of 60 °. The values shown in Table III correspond to the average gloss of 10 test pieces for each test polymer.

  The gloss meter to be used is a photometer Zane Toner ZGM1020 type or 1022 type with an incident angle set to 60 °. The measurement principle is described in ASTM-D2457. The apparatus is calibrated using a sample having a known gloss level.

Xylene soluble and insoluble fractions 2.5 g of polymer and 250 cm ³ of xylene are placed in a glass flask equipped with a freezer and a magnetic stirrer. The temperature is raised to the boiling point of the solvent over 30 minutes. The clear solution thus obtained is then placed under reflux and stirred for a further 30 minutes. The closed flask is placed in an ice-water bath for 30 minutes and then placed in a constant temperature water bath at 25 ° C. for another 30 minutes. The solid thus produced is filtered through a quick filter paper. A 100 cm ³ filtrate is placed in a pre-weighed aluminum container, which is heated on a hot plate under a stream of nitrogen to evaporate the solvent. The container is then placed in a furnace under vacuum at 80 ° C. and waits until a constant weight is reached. The weight percent of polymer soluble in xylene at room temperature is then calculated.

  The weight percent of the polymer insoluble in xylene at room temperature is considered the crystallizable portion of the polymer. This value also substantially corresponds to the isotacticity index determined by extraction with boiling n-heptane, which by definition is the isotacticity index of polypropylene.

Heat shrinkage in the vertical and horizontal directions Using a 100 x 200 x 2.5 mm plate using an injection molding machine "Sandlet Series 7-190" (190 indicates that the clamping force is 190 tons) Mold.
The injection conditions are as follows.
Melting temperature = 250 ° C .;
Mold temperature = 40 ° C .;
Injection time = 8 seconds;
Residence time = 22 seconds;
Screw diameter = 55mm

The plate is measured with calipers 48 hours after molding. The shrinkage rate is given by the following equation.
Longitudinal shrinkage = (200−measured value) / 200 × 100
Lateral shrinkage = (100−measured value) / 100 × 100
In the formula, 200 is the length (mm) in the vertical direction of the plate measured immediately after molding.
100 is the horizontal length (mm) of the plate measured immediately after molding.
The measured value is the length of the plate in the relevant direction.

Measurement of melting peak and melting enthalpy (ΔHm) by differential scanning calorimetry (DSC) The apparatus used is a Perkin Elmer Diamond DSC. The polymer sample is heated to 230 ° C. at a rate of 10 ° C./min and maintained in a nitrogen stream at 230 ° C. for 5 minutes, then cooled to 20 ° C. at a rate of 10 ° C./min and maintained at this temperature for 5 minutes. To crystallize the sample. The sample is then melted again to 230 ° C. at a heating rate of 10 ° C./min. This melting scan is recorded to obtain a thermogram from which the strongest peak temperature and melting enthalpy between 100-130 ° C. is read.

Preparation of Master Batch Composition (I) Three master batch compositions are prepared. The solid catalyst component used in the polymerization is a highly stereoselective Ziegler-Natta catalyst component supported on magnesium chloride as described in Example 5, lines 48-55 of European Patent EP 728769. Triethylaluminum (TEAL) is used as a cocatalyst and dicyclopentyldimethoxysilane (DCPMS) is used as an external donor.

  The solid catalyst component is contacted with TEAL and DCPMS at 12 ° C. for 24 minutes. The weight ratio between TEAL and the solid catalyst component and the weight ratio between TEAL and DCPMS are 20 and 10, respectively.

This catalyst system is then prepolymerized in a suspension in liquid propylene at 20 ° C. for about 5 minutes and then charged to the first polymerization reactor.

Polymerization Polymerization is carried out continuously in two connected reactors with means for transferring the product from one reactor to the next reactor. The first reactor is a liquid phase reactor and the second reactor is a fluidized bed gas phase reactor. Component (A ^I ) is produced in the first reactor and component (B ^I ) is produced in the second reactor.

Component (A ^I ) is a propylene homopolymer, Component (B ^I ) is an ethylene / butene-1 copolymer.

  The temperature and pressure are kept constant throughout the reaction period.

  Hydrogen is used as an automatic molecular weight regulator.

  The gas phase (propylene, ethylene, butene, and hydrogen) is continuously analyzed by gas chromatography.

  Table I shows the polymerization conditions and the molar ratio of the reactants, and the composition of the resulting copolymer.

  The polymer particles exiting the second reactor are subjected to steam treatment to remove reactive monomers and volatile materials and then dried.

  The polymer particles are then placed on a rotating drum where 0.05 wt.% Paraffinic oil ROL / OB30 (density according to ASTM-D1298: 0.842 kg / l (20 ° C.), pour point of ASTM-D97: −10 ° C), 0.15 wt% Irganox (R) B215 (consisting of about 34% Irganox (R) 1010 and 66% Irgaphos (R) 168), and 0.04 wt% DHT-4A Mix with (hydrotalcite).

  Irganox 1010 described above is 2,2-bis [3-[, 5-bis (1,1-dimethylethyl) -4-hydroxyphenyl) -1-oxopropoxy] methyl] -1,3-propanediyl- 3,5-Bis (1,1-dimethylethyl) -4-hydroxybenzenepropanoate and Irgaphos 168 is tris (2,4-di-tert-butylphenyl) phosphite.

  The polymer particles are then extruded from a screw extruder under nitrogen at a melting temperature of 200-250 ° C.

  The characteristics of the polymer composition shown in Table II were obtained by measuring the polymer thus extruded.

Examples 1 to 3 (Examples 1 to 2: the present invention, Example 3 to Reference Example)
Masterbatch compositions 1-3 prepared as described above are extruded under the above conditions and mechanically mixed with the other ingredients. The ratio of the polyolefin component used in these examples is calculated from the amount of components A), B) and C) of the final composition obtained by collecting the contributions of the polyolefin component and the correlation of the MFR logarithm values described above. Table III shows the calculated MFR-L values for A).

The following polyolefin components are used.
PP-1: a propylene homopolymer having an MFR-L value of 2000 g / 10 min and a solubility in xylene at room temperature of 2.3% by weight;
PP-2: a propylene homopolymer having an MFR-L value of 2 g / 10 min and a solubility in xylene at room temperature of 2.2% by weight;
Heco: 47.4% by weight, a propylene homopolymer having an MFR-L value of 100 g / 10 min and a solubility in xylene at room temperature of 3.5% by weight,
An ethylene / propylene copolymer comprising 46.9% by weight of 70% by weight of ethylene, having a solubility in xylene at room temperature of 66% by weight and an intrinsic viscosity of 2.5 dl / g of the xylene-soluble fraction; An ethylene / propylene copolymer containing 5.7% by weight, 34% by weight ethylene, having a solubility in xylene at room temperature of 90% by weight and an intrinsic viscosity of 2.6 dl / g of the xylene soluble fraction. Polyolefin composition (heterophasic blend).

  The two ethylene / propylene copolymers of the Heco component together constitute component C) of the composition of the present invention (final composition). Thus, the ethylene content of C) is 66.2% by weight, the solubility of C) in xylene at room temperature is 69% by weight, and the intrinsic viscosity of the xylene soluble fraction is about 2.5 dl / g. .

  In addition to the above polyolefin components, talc and nucleating agent corresponding to components D) and E), respectively, are added.

  The talc D) used is Neotalc UN105 from Neotalc Industries. The amount of D) in the compositions of all examples is 1 part by weight per 100 parts by weight of A) + B) + C).

  Sodium-2,2'-methylene-bis (4,6-di-t-butylphenyl) -phosphate (trade name NA11, manufactured by Asahi Denka Kogyo) is used as the nucleating agent E). The amount of E) in the compositions of all examples is 0.2 parts by weight per 100 parts by weight of A) + B) + C) + D).

  The properties of the final composition thus obtained are shown in Table III.

Claims (12)

All expressed in weight%
A) 50 to 85% by weight of a polypropylene component consisting of a propylene homopolymer, comprising at least 85% by weight of propylene,
For each polymer component of the n types of polymer components constituting the polypropylene component, MFR (MFR ¹ ,... MFR ⁿ ) measured under ASTM-D1238, condition L (230 ° C., 2.16 kg load) , respectively ,
The weight ratio (WA ¹ / W ^total ,... WA ⁿ / W ^total ) obtained by dividing the weight of each polymer component (WA ¹ ..., WA ⁿ ) by the total weight (W ^total ) of the polypropylene component was obtained,
Following formula:
ln MFR ^A = [WA ¹ / W ^total ] × ln MFR ¹ + ... + [WA ⁿ / W ^total ] × ln MFR ⁿ
In shown in MFR natural logarithm and MFR values calculated from the sum of the products (ln MFR ^A) of the weight ratio ^(MFR A) is 100 g / 10 minutes or more, at a solubility in xylene at room temperature is less than 20 wt% With some;
B) 3 to 20 wt%, a copolymer of ethylene and one or more _C 4 _{-C 10 -α-} olefin comprises _C 4 _{-C 10 -α-} olefin 15 to 35% by weight, at room temperature Having a solubility in xylene greater than 50% by weight and an intrinsic viscosity of the xylene soluble fraction of 2.5-4 dl / g;
C) a copolymer component comprising from 10 to 35% by weight of one or more copolymers of ethylene with propylene, having an ethylene content of at least 60% by weight and a solubility in xylene at room temperature of greater than 50% by weight; A polyolefin composition comprising: an xylene-soluble fraction having an intrinsic viscosity of 2-4 dl / g,
The amount of A), B) and C) is a value relative to the total weight of A) + B) + C), and the weight ratio B ₂ / C of the ethylene content B _{2 in} B) and the ethylene content C _{2 in} C) Polyolefin composition whose ₂ is 1.4 or less and the minimum is 0.8.
Furthermore, it contains 0.3-5 parts by weight of mineral filler D) with respect to 100 parts by weight of A) + B) + C), and the mineral filler comprises talc, CaCO ₃ , silica, mica, wollastonite ( The polyolefin composition according to claim 1, selected from the group consisting of CaSiO ₃ ), clay, diatomaceous earth, titanium oxide, and zeolite . Relative to 100 parts by weight of A) + B) + C) , or, A) + B) + C ) + relative to 100 parts by weight of D), claims, including nucleating agent E) of 0.01 to 0.5 parts by weight The polyolefin composition according to claim 1 or 2 . The polyolefin composition of claim 1 MFR-L values are on 10 g / 10 minutes or more. The proportion of the fraction (XI) insoluble in xylene at room temperature of component B) is:
(XI) <1.14 × B ₂ −34
(Wherein, B ₂ Component B) in, B) a polyolefin composition according to claim 1 satisfying at which) the amount of ethylene in weight percent relative to the weight of. It is a masterbatch composition used for manufacture of the polyolefin composition of any one of Claims 1-5,
All expressed in weight%
From A ^I) 60 to 85 wt-%, a polypropylene component comprising a propylene homopolymer comprises at least 85 wt% propylene, ASTM-D1238, condition L (230 ° C., measured under a load of 2.16 kg) MFR The L value is 20 g / 10 min or more and the solubility in xylene at room temperature is less than 20% by weight;
B ^I) 15 to 40 wt%, a copolymer of ethylene and _C 4 _{-C 10 -α-} olefins one or more kinds, including a _C 4 _{-C 10 -α-} olefin 15 to 35% by weight, at room temperature solubility in xylene greater than 50 wt.% of, Ri Do from those inherent viscosity of the xylene soluble fraction is 2.5~4dl / g,
The A ^I ) component is at least part of the A) component;
The B ^I ) component becomes the B) component
Masterbatch composition.   The composition according to claim 5, wherein the MFR-L value is 2 g / 10 min or more.   The composition according to claim 5, wherein ΔHm of the DSC melting peak detectable at a temperature between 100 and 130 ° C is 1 J / g or more. A composition according to any one of claims 5-7 obtainable by polymerizing in the presence of a Ziegler-Natta catalyst supported on MgCl _2. It is a manufacturing method of the polyolefin composition of any one of Claims 1-5, Comprising: All are represented by weight%,
From A ^I) 60 to 85 wt-%, a polypropylene component comprising a propylene homopolymer comprises at least 85 wt% propylene, ASTM-D1238, condition L (230 ° C., measured under a load of 2.16 kg) MFR The L value is 20 g / 10 min or more and the solubility in xylene at room temperature is less than 20% by weight;
B ^I) 15 to 40 wt%, a copolymer of ethylene and _C 4 _{-C 10 -α-} olefins one or more kinds, including a _C 4 _{-C 10 -α-} olefin 15 to 35% by weight, at room temperature Having a solubility in xylene of more than 50% by weight and an intrinsic viscosity of the xylene soluble fraction of 2.5 to 4 dl / g,
Only including,
A master batch composition in which the A ^I ) component becomes a part of the A) component and the B ^I ) component becomes the B component, and another polyolefin component containing the remainder of the A) component and the C) component And a melt-blending method. A product comprising the polyolefin composition according to any one of claims 1 to 5 .   The product of claim 11 in the form of a door trim.