JP3115766B2 - Propylene polymer composition for automotive interior parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propylene polymer composition, and more particularly to a propylene polymer composition, which can provide a molded article having excellent rigidity and impact resistance which can be used for automotive interior parts. It relates to an excellent low density propylene polymer composition.

[0002]

BACKGROUND OF THE INVENTION Propylene polymers are lightweight and have excellent moldability, and can provide molded articles having excellent heat resistance and chemical resistance. Widely used for applications.

Such a propylene polymer is required to have even better low-temperature impact resistance in applications such as home appliance parts and automobile parts, and therefore, for example, ethylene-propylene copolymers may be added to the propylene polymer. Rubber (EP
R) is imparted with impact resistance.

However, as described above, when a large amount of an ethylene / propylene copolymer rubber is added to a propylene polymer, impact resistance at a low temperature can be sufficiently imparted, but fluidity and rigidity decrease. Tend to. Various attempts have been made to prevent such a decrease in the balance of physical properties, such as changing the composition of the ethylene / propylene-based copolymer rubber compounded in the propylene polymer, adding a filler, and the like. For example, Japanese Patent Application Laid-Open No. 62-256
No. 856 discloses a polypropylene composition comprising a propylene / ethylene block copolymer, an ethylene / α-olefin random copolymer, and talc or calcium carbonate, which is excellent in impact resistance, rigidity, paintability and the like. It has been disclosed.

However, automotive parts formed from such a polypropylene composition are excellent in impact resistance, but inferior in fluidity and rigidity. Therefore, for use in automotive interior parts, it is required to impart more excellent fluidity and rigidity to the propylene polymer composition.

The present inventors have developed a propylene polymer having excellent fluidity and excellent impact resistance and capable of forming a molded article having excellent rigidity without impairing the excellent properties inherent in the propylene polymer. As a result of intensive research on the composition, a specific propylene-based block copolymer, a specific ethylene-propylene copolymer rubber, a specific ethylene-butene
-1 A propylene polymer composition obtained by blending a copolymer rubber and a nucleating agent in a specific ratio is excellent in fluidity at low density,
Moreover, they have found that it is possible to provide a molded article having excellent impact resistance and excellent rigidity without impairing the excellent properties inherent to the propylene polymer, and have completed the present invention.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems associated with the prior art as described above, without impairing the excellent properties inherent to propylene polymers, while providing excellent impact resistance and rigidity. It can form a molded article excellent in
An object of the present invention is to provide a low-density propylene polymer composition for automobile interior parts having excellent fluidity.

[0008]

SUMMARY OF THE INVENTION A propylene polymer composition for automotive interior parts according to the present invention comprises a propylene block copolymer [A], an ethylene / propylene copolymer rubber [B],
An ethylene / butene-1 copolymer rubber [C] and a nucleating agent [D].
To 94 parts by weight, ethylene / propylene copolymer rubber [B]
Is 3 to 6 parts by weight, ethylene / butene-1 copolymer rubber [C]
3 to 6 parts by weight (the total amount of the components [A], [B] and [C] is 100 parts by weight), and the nucleating agent [D] is 0.05 to 1.0 part by weight.
And the propylene-based block copolymer [A] contains (a) a structural unit derived from ethylene in an amount of 2 to 15 mol%,
(B) normal temperature n-decane soluble content is 6 to 15% by weight,
(C) Melt flow rate (ASTM D 1238; 230 ° C, 2.16
(measured with kg load) is 30 to 60 g / 10 min, and (d)
The value of the stereoregularity index [IP] obtained from the absorption intensity of Pmmmm and Pw in the ¹³ C-NMR spectrum of the boiling heptane-insoluble component by the following formula (1) is 0.960-0.
995, and the ethylene-propylene copolymer rubber [B] comprises (a) 3 units of structural units derived from ethylene.
(B) a melt flow rate (ASTM D 1238; measured at 230 ° C. under a load of 2.16 kg) of 0.1 to 5 mol%;
-5.0 g / 10 min, and ethylene-butene-1 copolymer rubber [C] contains (a) 85-95 mol% of a constituent unit derived from ethylene, and (b) melt flow. The rate (ASTM D 1238; measured at 230 ° C. under a load of 2.16 kg) is 1.0 to 10.0 g / 10 min, and the nucleating agent [D] is talc and / or a phosphate represented by the following formula (i): It is characterized by being a compound.

[0009]

(Equation 2)

In the formula, [Pmmmm] is an absorption intensity derived from a methyl group of the third unit in a site where five propylene units are continuously isotactically bonded, and [Pw] is a methyl group of a propylene unit. Is the absorption intensity derived from

[0011]

Embedded image

(Wherein R ¹ is oxygen, sulfur or a hydrocarbon group having 1 to 10 carbon atoms, R ² and R ³ are hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, and R ² , R ³ may be different even in the same kind, R ² to each other, may have a ring by bonding R ³ s or R ² and R ^3, M is a monovalent to trivalent metal atom And n is an integer of 1 to 3.) The composition has a density of 0.91 g / cm ^3.
Below, the MFR at 230 ° C. measurement is 30 g / 10 min or more, and the initial flexural modulus at 23 ° C. measurement is 1
It is possible to form a compact having a 5,000 kg / cm ² or more and an Izod impact strength of 8 kg · cm / cm or more when measured at 23 ° C.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The propylene polymer composition for automotive interior parts according to the present invention will be specifically described below.

In the present invention, the term "polymerization" may be used to mean not only homopolymerization but also copolymerization. The term "polymer" means not only homopolymer but also homopolymer. It is sometimes used to include a copolymer.

First, the components forming the propylene polymer composition for automotive interior parts according to the present invention will be described. Propylene-based block copolymer [A] The propylene-based block copolymer [A] used in the present invention contains 2 to 15 structural units derived from ethylene.
Mol%, preferably 4 to 10 mol%. Further, it contains normal-temperature n-decane-soluble components in a proportion of 6 to 15% by weight, preferably 9 to 13% by weight.

The content of the constituent units derived from ethylene as described above is a value measured by a conventional method such as infrared spectroscopy and NMR spectroscopy. 2 g was dissolved in 500 g of boiling n-decane for 5 hours to dissolve, then cooled to room temperature, and the precipitated solid phase was filtered through a G4 type glass filter, dried, and then back calculated from the measured solid phase weight. is there.

Further, the propylene-based block copolymer [A] has a melt flow rate (MFR; 230 ° C., 2.16 k) measured according to ASTM D1238.
g) (30 to 60 g / 10 min), preferably 4
0 to 50 g / 10 minutes.

The propylene-based block polymer [A] used in the present invention contains ¹³ C-
Stereoregularity index [IP] determined from the absorption intensity of Pmmmm and Pw in the NMR spectrum by the following formula (1)
Is 0.960 to 0.995, preferably 0.970
0.995 to 0.995, more preferably 0.980 to 0.995
In the range.

[0019]

(Equation 3)

(Wherein, Pmmmm: absorption intensity derived from the methyl group of the third unit at the site where 5 units of propylene units are continuously isotactically bonded, Pw: absorption intensity derived from the methyl group of the propylene unit) Here, when the boiling heptane-insoluble component of the propylene-based block copolymer is a propylene homopolymer, the insoluble component can be represented, for example, by the following formula (A).

[0021]

Embedded image

3 in 5 chains of propylene units represented by
The absorption intensity in the ¹³ C-NMR spectrum derived from the methyl group of the unit (for example, Me ³ , Me ⁴ ) is Pmmmm, and all the methyl groups (Me ¹ , Me ² ,
Assuming that the absorption intensity derived from Me ³ ...) Is Pw, the stereoregularity of the polypropylene represented by the above formula (A) can be evaluated by the value obtained from the above formula (1).

In the present invention, the boiling heptane-insoluble component N
The MR measurement is performed, for example, as follows. First, polymer sample 3 was placed in a 1-liter flask equipped with a stirrer.
g, 2,6-di-tert-butyl-4-methylphenol 20m
g, 500 ml of n-decane is added and dissolved by heating on an oil bath at 145 ° C. After the polymer sample is dissolved, it is cooled to room temperature over about 8 hours, and then kept on a 23 ° C. water bath for 8 hours. Contains precipitated polymer (23 ° C decane-insoluble component)
The n-decane suspension was separated by filtration through a G-4 (or G-2) glass filter, dried under reduced pressure, and then 1.5 g of a polymer.
Is subjected to Soxhlet extraction using heptane for 6 hours or more to obtain a boiling heptane-insoluble component.

Next, 0.35 g of this insoluble component is dissolved by heating in 2.0 ml of hexachlorobutadiene. After the solution was filtered through a glass filter (G-2), 0.5 ml of deuterated benzene was added, and the solution was charged into an NMR tube having an inner diameter of 10 mm. And, GX-5 manufactured by JEOL Ltd.
¹³ C-NMR at 120 ° C. using a 00 type NMR measuring apparatus
Perform a measurement. The number of integration is 10,000 or more. The value of the stereoregularity index [IP] can be determined from the peak intensity obtained by the above measurement.

The density of the boiling heptane-insoluble component of the propylene block copolymer used in the present invention is usually 0.9%.
00 g / cm ³ or more, preferably 0.905 g / cm ³
That is all.

The propylene block copolymer used in the present invention has a decane-soluble component at 23 ° C. of 6 to 15%, preferably 8 to 14%, more preferably 9 to 13%, particularly preferably 10 to 12%. % Range.

In the present invention, the amount of the propylene-based block copolymer soluble in decane at 23 ° C. is measured as follows. That is, in a 1-liter flask with a stirrer,
A polymer sample (3 g), 2,6-di-tert-butyl-4-methylphenol (20 mg), and n-decane (500 ml) are charged and dissolved in an oil bath at 145 ° C. by heating. After the polymer sample is dissolved, it is cooled to room temperature over about 8 hours, and then kept on a 23 ° C. water bath for 8 hours. The precipitated polymer and the n-decane solution containing the dissolved polymer are separated by filtration through a G-4 (or G-2) glass filter. The solution thus obtained was heated under the conditions of 10 mmHg and 150 ° C. and dried until the polymer dissolved in the n-decane solution was quantified. It is calculated as the weight percentage of the combined sample.

The propylene block copolymer [A] as described above can be produced using a usual stereoregular catalyst. For example, in the presence of a catalyst comprising a halogen-containing titanium compound catalyst component or a transition metal compound catalyst component supported on a carrier and an organoaluminum compound,
It is obtained by, for example, two-stage polymerization of propylene and ethylene. Specifically, first polymerize propylene alone,
Subsequently, by copolymerizing propylene and ethylene, a propylene-based block copolymer can be produced. Such a catalyst may further contain an electron donor as needed, and may be activated by a method such as co-milling. Specific production methods are described in, for example, JP-A-52-98045 and JP-B-57-266.
No. 13 discloses this in detail.

In the present invention, the propylene-based block copolymer [A] contains 2 to 1 structural units derived from ethylene.
5 mol%, normal temperature n-decane soluble content is 6-15
% By weight, and the melt flow rate is 30 to 60 g / 1.
As long as the time is 0 minutes, the whole may be a propylene-based block copolymer or a mixture of a propylene-based block copolymer and polypropylene.

Further, the propylene block copolymer [A] used in the present invention may contain a structural unit derived from another polymerizable monomer as long as the object of the present invention is not impaired. .

Specific examples of such a monomer include butene-1, hexene-1, octene-1, 4-methyl
Examples thereof include α-olefins such as -1-pentene, vinyl esters such as vinyl acetate, unsaturated organic acids such as maleic anhydride, and derivatives thereof.

When these other polymerizable monomers are contained, the propylene-based block copolymer [A] may be a ternary copolymer of ethylene, propylene and these other polymerizable monomers. Alternatively, a mixture of the ternary copolymer and a propylene-based block copolymer containing no other polymerizable monomer may be used.

In the present invention, the propylene block copolymer [A] is used as the propylene polymer. In particular, when the propylene block copolymer [A] as described above is used, mechanical properties such as impact resistance and rigidity are improved. A propylene polymer composition having excellent moldability, which is excellent in balance of mechanical strength and heat resistance and capable of forming a molded article having excellent processing dimensional stability, can be obtained.

In the present invention, the propylene-based block copolymer [A] as described above comprises a propylene-based block copolymer [A], an ethylene / propylene copolymer rubber [B] and an ethylene / butene-1 copolymer. It is used in a proportion of 88 to 94 parts by weight, preferably 90 to 94 parts by weight, based on 100 parts by weight of the total amount of the rubber [C].

Ethylene / propylene copolymer rubber [B] The ethylene / propylene copolymer rubber [B] used in the present invention comprises 35 to 5 structural units derived from ethylene.
0 mol%, preferably 35 to 45 mol%. The content of the constituent unit derived from ethylene is a value measured by a conventional method such as infrared spectroscopy and NMR spectroscopy.

The ethylene / propylene copolymer rubber [B] has a melt flow rate (MFR; 230 ° C., 2.16 kg) measured according to ASTM D1238.
(Measured by load) is 0.1 to 5.0 g / 10 min, preferably 0.5 to 3.0 g / 10 min.

Further, the ethylene / propylene copolymer rubber [B] may be provided in any shape such as a pellet, a crumb, a veil, etc., as long as the kneading performed in forming the composition is not hindered.

In the present invention, the above-mentioned ethylene-propylene copolymer rubber [B] is composed of a propylene-based block copolymer [A], an ethylene-propylene copolymer rubber [B] and an ethylene-butene-1 copolymer. It is used in an amount of 3 to 6 parts by weight, preferably 3 to 5 parts by weight, based on 100 parts by weight of the total amount of the rubber [C].

Ethylene / butene-1 copolymer rubber [C] The ethylene / butene-1 copolymer rubber [C] used in the present invention contains 85 to 9 structural units derived from ethylene.
The content is 5 mol%, preferably 88 to 92 mol%. The content of the constituent unit derived from ethylene is a value measured by a conventional method such as infrared spectroscopy and NMR spectroscopy.

This ethylene / butene-1 copolymer rubber [C]
Has a melt flow rate (MFR; measured at 230 ° C. under a load of 2.16 kg) of 1.0 to 10.0 g / 10 minutes, preferably 3.0, according to ASTM D1238.
~ 6.0 g / 10 min.

Further, the ethylene / butene-1 copolymer rubber [C] may contain structural units derived from the following polymerizable comonomers as long as the object of the present invention is not impaired. .

Specific examples of such a polymer comonomer include butene-1, pentene-1, hexene-1,
Α-olefins such as 4-methyl-1-pentene; and dienes such as ethylidene norbornene, dicyclopentadiene and butadiene.

In the present invention, the above-mentioned ethylene / butene-1 copolymer rubber [C] comprises a propylene-based block copolymer [A], an ethylene / propylene copolymer rubber [B] and an ethylene / butene-1 copolymer. It is used in an amount of 3 to 6 parts by weight, preferably 3 to 5 parts by weight, based on 100 parts by weight of the total amount of the copolymer rubber [C].

Nucleating agent [D] The nucleating agent [D] used in the present invention is talc and / or a specific phosphate compound.

The talc has an average particle diameter of usually 0.2 to 10 μm, as measured by a light transmission method of a liquid phase sedimentation method.
Preferably it is 0.2-5 μm. This talc may be untreated or surface-treated in advance. Specific examples of the surface treatment include a chemical or physical treatment using a treating agent such as a silane coupling agent, a higher fatty acid, a fatty acid metal salt, an unsaturated organic acid, an organic titanate, a resin acid, or polyethylene glycol. be able to.

The use of the surface-treated talc makes it possible to obtain a composition having excellent weld strength, coating properties and moldability. By blending the talc as described above in the propylene polymer composition, a molded article formed from this composition has excellent balance between impact resistance and rigidity at low temperatures, and has good coating properties and dimensions. Excellent stability and appearance.

In the present invention, among such talcs, talc having an average aspect ratio of 3 or more, particularly 4 or more, is preferable.

The specific phosphate compound is represented by the following formula (i)
Is represented by

[0049]

Embedded image

(Wherein, R ¹ is oxygen, sulfur, or a hydrocarbon group having 1 to 10 carbon atoms, R ² and R ³ are hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, and R ² , R ³ may be different even in the same kind, R ² to each other, may have a ring by bonding R ³ s or R ² and R ^3, M is a monovalent to trivalent metal atom And n is an integer of 1 to 3.) As the compound represented by the formula (i), specifically, sodium-2,2'-methylene-bis (4,
6-di-t-butylphenyl) phosphate, sodium
-2,2'-Ethylidene-bis (4,6-di-t-butylphenyl)
Phosphate, lithium-2,2'-methylene-bis (4,6
-Di-t-butylphenyl) phosphate, lithium-2,
2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate, sodium-2,2'-ethylidene-bis (4-
i-propyl-6-t-butylphenyl) phosphate, lithium-2,2'-methylene-bis (4-methyl-6-t-butylphenyl) phosphate, lithium-2,2'-methylene-bis ( 4-ethyl-6-t-butylphenyl) phosphate,
Calcium-bis [2,2'-thiobis (4-methyl-6-t-butylphenyl) phosphate], Calcium-bis [2,2'-thiobis (4-ethyl-6-t-butylphenyl) phosphate] ], Calcium-bis [2,2'-thiobis (4,6-di-t-butylphenyl) phosphate], magnesium-bis [2,2'-thiobis (4,6-di-t-butylphenyl) Phosphate], magnesium-bis [2,2 '
-Thiobis (4-t-octylphenyl) phosphate], sodium-2,2'-butylidene-bis (4,6-dimethylphenyl) phosphate, sodium-2,2'-butylidene-bis (4,6- Di-t-butylphenyl) phosphate, sodium-2,2'-t-octylmethylene-bis (4,6-
Dimethylphenyl) phosphate, sodium-2,2'-
t-octylmethylene-bis (4,6-di-t-butylphenyl) phosphate, calcium-bis [2,2′-methylene-bis (4,6-t-butylphenyl) phosphate],
Magnesium-bis [2,2'-methylene-bis (4,6-di-t
-Butylphenyl) phosphate], barium-bis [2,2'-methylene-bis (4,6-di-t-butylphenyl)
Phosphate], sodium-2,2'-methylene-bis (4-methyl-6-t-butylphenyl) phosphate, sodium-2,2'-methylene-bis (4-ethyl-6-t-butylphenyl) ) phosphate, sodium (4,4'-dimethyl - 6, 6'-di -t- butyl-2,2'-biphenyl) phosphate, calcium (4,4'-dimethyl-6,6'-di - t-butyl-
2,2'-biphenyl) phosphate, sodium-2,2'-
Ethylidene-bis (4-m-butyl-6-t-butylphenyl)
Phosphate, sodium-2,2'-methylene-bis (4,
6-dimethylphenyl) phosphate, sodium-2,
2'-methylene-bis (4,6-diethylphenyl) phosphate, potassium-2,2'-ethylidene-bis (4,6-di-t-
Butylphenyl) phosphate, calcium-bis [2,2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate], magnesium-bis [2,2'-ethylidene-bis (4,6 -Di-t-butylphenyl) phosphate], barium-bis [2,2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate], aluminum-tris [2,2'-methylene -Bis (4,6-di-t-
Butylphenyl) phosphate] and aluminum
-Tris [2,2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate] and mixtures of two or more thereof. Especially sodium-2,2'-
Methylene-bis (4,6-di-t-butylphenyl) phosphate is preferred.

In the present invention, the nucleating agent [D] as described above comprises a propylene-based block copolymer [A], an ethylene / propylene copolymer rubber [B], and an ethylene / butene-1 copolymer rubber [C]. Of 0.05 to 1.0 part by weight, preferably 0.1 to 0.
Used in a proportion of 5 parts by weight.

By mixing the nucleating agent [D] with the propylene-based block copolymer in the above ratio, a propylene polymer composition having low density and excellent rigidity can be obtained. Method for Preparing Propylene Polymer Composition The propylene polymer composition for automobile interior parts according to the present invention comprises a propylene block copolymer [A], an ethylene / propylene copolymer rubber [B], an ethylene / butene -1 Copolymer rubber [C] and nucleating agent [D] are used in specific proportions, and are prepared by a generally used melt-kneading method of a composition. For kneading, for example, a kneading device such as a single-screw extruder, a twin-screw extruder, a twin-screw kneader, a Banbury mixer, or a roll can be used.

The composition according to the present invention is usually used by melting and kneading the above components with a kneading device such as an extruder and then forming the kneaded product into pellets. The order of adding each component to the apparatus during the above preparation is not limited, and may be simultaneous or separate. Further, a master batch kneaded product containing the components [B], [C], and [D] is obtained in advance, and the master batch is blended and compounded while being diluted with the propylene-based block copolymer [A]. Alternatively, the composition according to the present invention may be obtained by molding or molding.

The above components have good kneading properties and can be easily kneaded to form a composition. The propylene polymer composition according to the present invention obtained as described above has a low density and excellent fluidity, and has a conventional propylene polymer or a propylene polymer-ethylene / propylene copolymer rubber composition. The rigidity and impact resistance at low temperatures are not impaired.

The propylene polymer composition according to the present invention comprises:
In addition to the components described above, other components may be contained within a range that does not impair the object of the present invention. As such other components, a thermoplastic resin or a thermosetting resin can be mentioned. Specifically, polyethylene, polybutene-1, etc.
-Olefin homopolymer, α-olefin copolymer, α
-Copolymers of olefins and vinyl monomers, modified olefin polymers such as maleic anhydride-modified polypropylene,
Nylon, polycarbonate, ABS, polystyrene,
Examples thereof include polyvinyl chloride, polyphenylene oxide, petroleum resin, and phenol resin.

Further, the following rubbers and latex can be mentioned. Polybutadiene, polyisoprene, 1,2-polybutadiene acrylonitrile / butadiene rubber, polyisobutylene, styrene / butadiene rubber,
Styrene / butadiene / styrene block copolymer, styrene / isobutylene / styrene block copolymer.

The hydrogenated product of a styrene / butadiene / styrene block copolymer and the hydrogenated product of a styrene / isobutylene / styrene block copolymer can also be mentioned. In addition, as a filler, silica, diatomaceous earth, alumina, titanium oxide, magnesium oxide, pumice powder, pumice balloon, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, barium sulfate , Calcium sulfite, clay, mica, asbestos, glass fiber, glass flake, glass beads, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, molybdenum sulfide, boron fiber, silicon carbide fiber, polyethylene fiber, polypropylene fiber, polyester fiber And polyamide fibers. However, if the density of the propylene polymer composition exceeds 0.91 g / cm ³ , the advantage of lightness is impaired and properties such as impact resistance are reduced. Is preferably added in an amount not exceeding 0.91 g / cm ³ .

Further, as additives other than the above-mentioned additives, specifically, phenol-based, sulfur-based, phosphorus-based antioxidants, lubricants, antistatic agents, dispersants, copper damage inhibitors, Examples thereof include a wetting agent, a foaming agent, a plasticizer, a foam inhibitor, a flame retardant, a crosslinking agent, a flow improver such as a peroxide, and a weld strength improver. The propylene polymer composition according to the present invention can further improve the balance of physical properties, durability, paintability, printability, scratch resistance, and moldability by adding such additives.

[0059]

The propylene polymer composition according to the present invention comprises a specific propylene-based block copolymer [A], a specific ethylene-propylene copolymer rubber [B], and a specific ethylene-butene-1 copolymer. Since the polymer rubber [C] and the specific nucleating agent [D] are contained in a specific ratio, a molded article formed from such a composition has a low density and excellent fluidity. It is excellent in rigidity and impact resistance as compared with a molded article formed from a propylene polymer composition.

Therefore, the above-mentioned effects are obtained.
The propylene polymer composition according to the present invention is particularly useful for automotive interior parts, specifically, door trim,
It can be suitably used for front pillar garnish, center pillar garnish, rear quarter trim, kick plate, door pocket, and the like.

Further, the propylene polymer composition according to the present invention has excellent fluidity and high rigidity of the molded product, so that a product of an automobile interior part can be reduced in size and thickness, and the weight of the part can be reduced. Cost can be reduced.

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these examples. In the following Examples, each physical property was measured as follows. (1) Melt flow rate (MFR) Based on ASTM D1238. Measurement conditions: 230 ° C, 2.16 kg load Sample: pellet

(2) Flexural Modulus (FM) According to ASTM D790. Test piece: 12.7 mm (width) x 6.4 mm (thickness) x 12
7mm (length) Span: 100mm Bending speed: 2mm / min

(3) Izod impact value (IZ) This was based on ASTM D256. Temperature: 23 ° C, 0 ° C Specimen: 12.7mm (width) x 6.4mm (thickness) x 64mm
(Length) Notch; machining

(4) Density According to ASTM D 1505.

In the examples and comparative examples, the physical properties of the components used in preparing the propylene polymer composition are as follows. Propylene block copolymer / PP-A (a) Content of structural units derived from ethylene; 6.7 mol% (b) n-decane soluble matter at normal temperature; 11.8 wt% (c) Melt flow Rate (MFR): 53 g / 10 min (d) Value of stereoregularity index [IP value]: 0.979 ・ PP-B (a) Content of structural unit derived from ethylene; 9.7 mol% ( b) Room temperature n-decane soluble matter; 12.2% by weight (c) Melt flow rate (MFR); 55 g / 10 minutes (d) Value of stereoregularity index [IP value]; 0.957 • PP-C (A) Content of constituent units derived from ethylene; 6.5 mol% (b) Soluble n-decane at normal temperature; 10.6% by weight (c) Melt flow rate (MFR): 80 g / 10 min ( d) the value of the pentad tacticity [IP value; 0.975 ethylene-flop The content of propylene copolymer rubber · EPR-A (a) constituent units derived from ethylene; 40 mol% (b) melt flow rate (MFR); from 2.0 g / 10 min · EPR-B (a) ethylene (B) Melt flow rate (MFR): 1.8 g / 10 minutes Ethylene / butene-1 copolymer rubber / EBR-A (a) Structural unit derived from ethylene (B) Melt flow rate (MFR): 6.7 g / 10 min EBR-B (a) Content of structural unit derived from ethylene; 89 mol% (b) Melt flow rate (MFR); 0.5 g / 10 min EBR-C (a) Content of structural units derived from ethylene; 78 mol% (b) Melt flow rate (MFR): 3.8 g / 10 min nucleating agent Nucleating agent -A Sodium-2,2'-methylene-bis (4,6-di-t-butylphenyl) phosphate -Nucleating agent-B Talc with an average particle diameter of 2.3 µm

[0067]

Example 1 PP as a propylene-based block copolymer
-A 88 parts by weight, EPR-A6 as an ethylene / propylene copolymer rubber
And parts, and the EBR-A 6 parts by weight of an ethylene-butene-1 copolymer rubber and a nucleating agent -A 0.2 part by weight as a nucleating agent, was thoroughly mixed using a Henschel mixer, 20
Pellets of the propylene polymer composition were prepared by passing through a twin screw extruder set at 0 ° C.

Then, the pellets of the prepared composition were molded into an ASTM test piece for the above physical property test by an in-line injection molding machine under the conditions of a resin temperature of 200 ° C. and a mold temperature of 40 ° C. to obtain the above physical properties. It was measured.

Table 1 shows the results.

[0070]

Embodiment 2 In Embodiment 1, PP-A, EPR-A
And EBR-A, except that the compounding amounts of EBR-A were 92 parts by weight, 4 parts by weight, and 4 parts by weight, respectively,
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

Table 1 shows the results.

[0072]

Embodiment 3 In Embodiment 1, PP-A, EPR-A
And EBR-A in the same manner as in Example 1 except that the compounding amounts of EBR-A were 94 parts by weight, 3 parts by weight, and 3 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

Table 1 shows the results.

[0074]

Embodiment 4 In Embodiment 1, PP-A, EPR-A
And EBR-A were 92 parts by weight, 4 parts by weight, and 4 parts by weight, respectively, except that 0.5 part by weight of nucleating agent-B was used instead of nucleating agent-A in the same manner as in Example 1. Thus, pellets of the propylene polymer composition were prepared. Hereinafter, in the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

Table 1 shows the results.

[0076]

Embodiment 5 In Embodiment 1, PP-A and EPR-
A, EBR-A and nucleating agent-A were added at 92
Parts by weight, 4 parts by weight, 4 parts by weight, and 0.1 part by weight, and 0.5% of nucleating agent B in addition to nucleating agent A as nucleating agent [D].
Pellets of a propylene polymer composition were prepared in the same manner as in Example 1, except that parts by weight were used. Hereinafter, Example 1
In the same manner as in the above, the above-mentioned ASTM test piece was molded and the above-mentioned properties were measured.

Table 1 shows the results.

[0078]

Comparative Example 1 In Example 1, PP-A, EPR-A
And EBR-A in the same manner as in Example 1 except that the compounding amounts of EBR-A were 86 parts by weight, 7 parts by weight, and 7 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

Table 1 shows the results.

[0080]

Comparative Example 2 In Example 1, PP-A and EPR-A
And EBR-A in the same manner as in Example 1 except that the compounding amount of each was 96 parts by weight, 2 parts by weight, and 2 parts by weight,
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0082]

Comparative Example 3 In Example 1, PP-A and EPR-
A, EBR-A and nucleating agent-A were added at 92
Parts by weight, 4 parts by weight, 4 parts by weight, and 0 parts by weight,
In the same manner as in Example 1, pellets of the propylene polymer composition were prepared. Hereinafter, in the same manner as in Example 1, the above A
An STM test piece was molded and the above physical properties were measured.

The results are shown in Table 1.

[0084]

Comparative Example 4 In Example 1, PP-A and EPR-A
And EBR-A in the same manner as in Example 1 except that the compounding amounts of EBR-A were 92 parts by weight, 8 parts by weight, and 0 part by weight, respectively.
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0086]

Comparative Example 5 In Example 1, PP-A and EPR-A
And EBR-A in the same manner as in Example 1 except that the compounding amounts of EBR-A were 92 parts by weight, 0 parts by weight, and 8 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared. Less than,
In the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0088]

Comparative Example 6 In Example 1, PP-A and EBR
The amounts of -A were 92 parts by weight and 4 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared in the same manner as in Example 1, except that 4 parts by weight of EPR-B was used instead of PR-A. Hereinafter, in the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0090]

Comparative Example 7 In Example 1, P-A was used instead of PP-A.
EPR-A and EBR-A using 92 parts by weight of PB
, Except that the compounding amount of each was 4 parts by weight and 4 parts by weight,
In the same manner as in Example 1, pellets of the propylene polymer composition were prepared. Hereinafter, in the same manner as in Example 1, the above A
An STM test piece was molded and the above physical properties were measured.

The results are shown in Table 1.

[0092]

Comparative Example 8 In Example 1, P-A was used instead of PP-A.
EPR-A and EBR-A using 92 parts by weight of PC
, Except that the compounding amount of each was 4 parts by weight and 4 parts by weight,
In the same manner as in Example 1, pellets of the propylene polymer composition were prepared. Hereinafter, in the same manner as in Example 1, the above A
An STM test piece was molded and the above physical properties were measured.

The results are shown in Table 1.

[0094]

Comparative Example 9 In Example 1, PP-A and EPR were used.
The amounts of -A were 92 parts by weight and 4 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared in the same manner as in Example 1, except that 4 parts by weight of EBR-B was used instead of BR-A. Hereinafter, in the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0096]

Comparative Example 10 In Example 1, PP-A and EPR-
A and EBR-A were added in an amount of 92 parts by weight,
Pellets of the propylene polymer composition were prepared in the same manner as in Example 1 except that the nucleating agent-B was used in place of 3.0 parts by weight instead of the nucleating agent-A. Hereinafter, in the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

Table 1 shows the results.

[0098]

Comparative Example 11 In Example 1, PP-A and EP
The amount of RA is 92 parts by weight and 4 parts by weight, respectively.
Pellets of the propylene polymer composition were prepared in the same manner as in Example 1 except that 4 parts by weight of EBR-C was used instead of EBR-A. Hereinafter, in the same manner as in Example 1, the above-mentioned ASTM test piece was molded and the above-mentioned physical properties were measured.

The results are shown in Table 1.

[0100]

[Table 1]

[0101]

[Table 2]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08L 23:16) (72) Inventor Hisakataka Kamaike 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Pref. References JP-A-5-279526 (JP, A) JP-A-5-98098 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 53/00 C08K 3/34 C08K 5/523

Claims (2)

(57) [Claims] 1. A propylene-based block copolymer [A],
Ethylene-propylene copolymer rubber [B]
It comprises a butene-1 copolymer rubber [C] and a nucleating agent [D]. The propylene block copolymer [A] is 88 to 94 parts by weight, and the ethylene / propylene copolymer rubber [B] is 3 to 6 parts by weight. 3 to 6 parts by weight of the ethylene / butene-1 copolymer rubber [C] (the total amount of the components [A], [B] and [C] is 10
0 parts by weight), the nucleating agent [D] is contained in an amount of 0.05 to 1.0 parts by weight, and the propylene-based block copolymer [A] is (a) derived from ethylene. (B) normal-temperature n-decane-soluble matter is 6 to 15% by weight, and (c) a melt flow rate (ASTM D 123).
8; measured at 230 ° C. under a load of 2.16 kg) is 30 to 60 g / 10 min. (D) It is obtained from the absorption intensity of Pmmmm and Pw in the ¹³ C-NMR spectrum of the boiling heptane-insoluble component by the following formula (1). The value of the stereoregularity index [IP] is in the range of 0.960 to 0.995, and the ethylene-propylene copolymer rubber [B] contains (a) 35 to 50 mol% of the structural unit derived from ethylene. (B) melt flow rate (ASTM D 1238; 230
C., measured under a load of 2.16 kg) is 0.1 to 5.0 g / 10 min, and the ethylene / butene-1 copolymer rubber [C] has (a) 85 to 95 mol of a structural unit derived from ethylene. % (B) melt flow rate (ASTM D 1238; 230
C., measured under a load of 2.16 kg) is 1.0 to 10.0 g / 10 min, and the nucleating agent [D] is talc and / or a phosphate compound represented by the following formula (i). Propylene polymer composition for automotive interior parts; (Where [Pmmmm] is the absorption intensity derived from the methyl group of the third unit at the site where 5 units of propylene units are continuously bonded isotactically, and [Pw] is derived from the methyl group of the propylene unit. This is the absorption intensity.) (Wherein, R ¹ is oxygen, sulfur, or a hydrocarbon group having 1 to 10 carbon atoms, R ² and R ³ are hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, and R ² and R ³ are be homologous may be heterologous also, R ² to each other, may have a ring by bonding R ³ s or R ² and R ^3, M is a monovalent to trivalent metal atom, n is an integer of 1 to 3.) 2. The propylene polymer composition has a density of 0.91 g / cm ³ or less and a melt flow rate (ASTM D 1238; measured at 230 ° C. under a load of 2.16 kg) of 30 g / cm 2.
10 minutes or more, and the initial flexural modulus (measured in an atmosphere at 23 ° C.) of 15,000 kg / cm ² or more;
Izod impact strength (measured at 23 ° C) is 8kg
The propylene polymer composition for an automobile interior part according to claim 1, wherein a molded body having a size of at least cm / cm can be formed.