JPH0971691A - Polypropylene resin composition for interior automotive trim and interior automotive trim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an interior automotive trim such as instrument panel and door panel, having good appearance especially at the weld part and low gloss on a grain surface to enable the use without coating and enabling the control of the balance of impact resistance, rigidity, etc. SOLUTION: The objective interior automotive trim is produced by the injection molding of a polypropylene resin composition composed of (A) 50-100wt.% of a composition containing a crystalline polypropylene polymer which can be fractionated by temperature-raising fractionation into (a) a fraction soluble in o-dichlorobenzene(ODCB) at 30 deg.C, (b) a fraction soluble in ODCB at 30-105 deg.C and (c) a fraction insoluble in ODCB at 105 deg.C, wherein the intrinsic viscosity [η]of the component (a) is 2.0-10dL/g or over, the relaxation time τ of the component (c) is 0.01-0.35sec, the molecular weight distribution index (PDI) is 1-18, the weight ratio of (b)/[(b)+(c)] is 0-0.20 and the weight ratio of (a)/[(a)+(b)+(c)] is 0.03-0.35 and (B) 50-0wt.% of an inorganic filler.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polypropylene resin composition for an automobile interior member and an automobile interior member. More specifically, it has an excellent balance of impact resistance and rigidity, and particularly good appearance performance such as weld appearance. And a composition used for the manufacture of automobile interior members such as instrument panels and trims, which have a low glossiness and have a texture as a molding material capable of omitting matte coating, and the composition The present invention relates to an automobile interior member formed by injection molding.

[0002]

2. Description of the Related Art Polypropylene-based resins have excellent workability, chemical resistance, weather resistance, electrical characteristics, etc., and are therefore used as general-purpose resins for automobile parts, home appliances, office automation equipment, and various injection molded products. Widely used in the fields of blow molded products, vacuum / pneumatic molded products, films and sheets. By the way, a polypropylene-based resin mixed with a filler as a reinforcing material is usually used for an interior part of an automobile, particularly an instrument panel which is required to have rigidity. However, in the polypropylene-based resin mixed with the filler, conventionally, there has been a problem that the weld appearance is insufficient. Also, since this instrument panel is located in front of the driver's seat of the car,
Materials with low gloss are required so that accidents do not occur due to reflection of sunlight, but up to now, no materials having sufficiently low gloss have been found. Therefore, in the instrument panel, it is the actual situation that the above problem is dealt with by applying a matte coating on the whole surface or a part (weld part), and therefore the cost is unavoidably high.

Regarding the polypropylene resin composition,
Recently, a thermoplastic resin composition for an automobile bumper composed of a crystalline propylene-based copolymer, polyethylene, an ethylene-propylene-based copolymer rubber and talc (JP-A-7-
149969), a thermoplastic resin composition containing a propylene-ethylene block copolymer obtained by multi-stage polymerization and a polyolefin-based rubber (JP-A-7-149998), a propylene-ethylene block obtained by multi-stage polymerization. A polyolefin composition containing a copolymer, an ethylene-propylene copolymer rubber, a polyolefin and talc has been proposed (Japanese Patent Laid-Open No. 149997 / 7-14997). However, these compositions all have strength,
The purpose is to improve the moldability and paintability, but the weld appearance and low gloss are not satisfactory, and there is a limit to the application to interior parts for automobiles. Further, as the composition having low gloss, a polyolefin composition comprising a propylene polymer and a partially crosslinked thermoplastic elastomer or an ethylene-propylene-conjugated diene terpolymer (JP-A-7-157607), A composition containing a modified olefin resin and a gelling agent (JP-A-6-192509) has been proposed. However, although these compositions have achieved low gloss to a certain extent, they are still insufficient, and they employ gelling or crosslinking means, and thus their uniformity, surface appearance, difficulty in recycling, etc. Has the problem of. On the other hand, a composition comprising a propylene-ethylene block copolymer having a specified crystal lamella thickness of a propylene homopolymer, a specific rubber, polyethylene and talc (Japanese Patent Application Laid-Open No. 7-
No. 53843) has been proposed. However,
No difference is seen in the low gloss from the examples and comparative examples,
It does not show a special relationship between lamella thickness and gloss. Also, the degree of low gloss is not sufficient.

[0004]

Under the circumstances, the present invention has an excellent balance of impact resistance and rigidity, has good appearance performance such as weld appearance, and has low gloss and gloss. A polypropylene-based resin composition for automobile interior members such as an instrument panel that can be replaced with an ABS resin that has been matt-coated to impart weather resistance The purpose is to provide an interior member.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to develop a polypropylene resin composition for automobile interior members having the above-mentioned preferable properties, and as a result, the fractionation by the temperature rising fractionation method is carried out. A crystalline polypropylene-based polymer-containing composition in which each component has a specific ratio and properties, or a polypropylene-based resin composition containing the composition and an inorganic filler in a specific ratio can achieve the object. I found that. The present invention has been completed based on such findings. That is, the present invention provides (A) 3 in the temperature rising fractionation method using (A) o-dichlorobenzene.
It can be separated into an o-dichlorobenzene-soluble component at 0 ° C., (b) an o-dichlorobenzene-soluble component at a temperature higher than 30 ° C. and 105 ° C. or lower, and (c) an o-dichlorobenzene-insoluble component at 105 ° C., and (1) Intrinsic viscosity of component (a) [η]
(135 ° C, in decalin) 2.0 to 10 deciliters /
g, and the relaxation time τ of the component (2) (c) is 0.1 at an angular frequency ω of 10 ⁰ / sec obtained from the melt viscoelasticity measurement.
It is 01 to 0.35 seconds, and the angular frequency at which the storage elastic modulus (G ′) obtained from the melt viscoelasticity measurement becomes 2 × 10 ² Pa is ω ₁ , 2 × 10 ⁴ Pa Frequency to ω
₂ , the molecular weight distribution index (PDI) represented by ω ₂ / 10ω ₁ is 1 to 18, and (3) (B)
Component amount / [(b) component amount + (c) component amount] Weight ratio is 0
0.20, and the weight ratio of (4) (a) component amount / [(a) component amount + (b) component amount + (c) component amount] is 0.03 to
Provided is a polypropylene resin composition for automobile interior parts, which comprises 50 to 100% by weight of a crystalline polypropylene polymer-containing composition of 0.35 and (B) an inorganic filler of 50 to 0% by weight. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the resin composition of the present invention,
The crystalline polypropylene-based polymer-containing composition used as the component (A) is obtained by the temperature-raising fractionation method: (a) an o-dichlorobenzene (ODCB) -soluble component at 30 ° C .;
ODCB-soluble content above 105 ° C and below 105 ° C and (c) 1
Fractionated into ODCB insoluble matter at 05 ° C. The temperature rising fractionation method is performed by the method described below. That is, add 20 g of the sample to 300 ml of ODCB,
After completely dissolving at about 150 ° C., the solution was injected into a silica gel column (diameter 100 mm, height 300 mm),
The temperature is lowered to 23 ° C at a rate of 5 ° C / hour. Then 30 ° C
Up to 30 ° C when the temperature becomes constant
The CB soluble component [(a) component] is taken out and separated. Then, while flowing ODCB at 5 ml / min, 105
When the temperature became constant and the temperature became constant, the polymer was eluted and re-precipitated in 5 times volume of acetone to recover the polymer, and the polymer was recovered at a temperature higher than 30 ° C and lower than 105 ° C ODCB.
The soluble component [(b) component]. Next, the temperature was raised to 135 ° C. while flowing ODCB at 5 ml / min to completely elute the polymer, and then the polymer was recovered by reprecipitation in 5 volumes of acetone, and the ODCB-insoluble matter at 105 ° C. [(C) component]. The component (a) is mainly an amorphous polymer component, particularly a thermoplastic elastomer component. Examples of the elastomer component include ethylene in the propylene-ethylene block copolymer composition and other α-olefin ( For example, a random copolymer with propylene or the like) can be mentioned. The ethylene unit content in this copolymer is usually 25 to 60% by weight, preferably 3
5 to 50% by weight. Further, the elastomer of the component (a) is not limited to these, and ethylene-α-, which is commonly used as an elastomer, is generally used.
Olefin copolymer elastomer, hydrogenated ethylene-
It may be an α-olefin-diene copolymer elastomer, a hydrogenated styrene-diene copolymer elastomer, or a mixture of two or more thereof. The component (b) is not particularly limited, but examples thereof include low-crystalline polypropylene resin and polyethylene resin. Further, the component (c) is mainly a crystalline polypropylene resin component, and this crystalline polypropylene resin may be a homopolymer of propylene, and other α such as propylene and 2% by weight or less of ethylene. -It may be a copolymer with an olefin.

In the present invention, the intrinsic viscosity [η] (135 ° C. in decalin) of the component (a) is 2.0 to 10 deciliter / g. This [η] is 2.0 deciliters /
If it is less than g, the resulting molded article has a poor weld appearance and the low gloss on the textured surface is insufficient. Also, [η] is 1
If it exceeds 0 deciliter / g, the moldability such as generation of flow marks is deteriorated. From the aspects of weld appearance, low gloss on the textured surface and moldability, the preferred [η] is 2.2
It is 9.0 deciliter / g, and particularly 2.4 to 8.0 deciliter / g is preferable. Further, the (c) component, the angular frequency ω obtained from the melt viscoelasticity measurement is the relaxation time τ at 10 ⁰ / sec is 0.01 to 0.35 seconds. When the relaxation time τ exceeds 0.35 seconds, the molded product obtained has a poor weld appearance, the low gloss on the textured surface is insufficient, and color unevenness easily occurs. From the aspect of appearance and low gloss on the textured surface, the preferred relaxation time τ is 0.02 to 0.
It is 30 seconds, and particularly preferably 0.02 to 0.25 seconds. This relaxation time τ is based on Rheometrics System 4
[Rotary rheometer, cone plate (25mm
φ), cone angle: 0.1 radian], temperature 1
75 sinusoidal shear strain at an angular frequency ω = 10 ⁰ / sec at ℃ addition, since 'and loss modulus G' storage modulus G and 'was calculated using the equation = G' / .omega.G '' value Is.

The component (c) has an angular frequency of ω ₁ , 2 × 10 ⁴ Pa such that the storage elastic modulus (G ′) obtained from the melt viscoelasticity measurement becomes 2 × 10 ² Pa. When the angular frequency is ω ₂ , the molecular weight distribution index (PDI) represented by ω ₂ / 10ω ₁ is 1 to 18. This PD
When I exceeds 18, the molded product obtained has a poor weld appearance, has insufficient low gloss on the embossed surface, and
The molecular weight distribution index (PDI) is preferably 2 to 16, particularly preferably 2 to 14, from the viewpoint of appearance of color unevenness, appearance and low glossiness. Note that this PDI
Is a Rheometrics system 4
[Rotary rheometer, cone plate (25mm
φ), cone angle: 0.1 radian] and measurement conditions were 175 ° C. and a strain of 30%.

Further, the isotactic pentad fraction of the component (C) is usually 91% or more. If this fraction is less than 91%, the rigidity is insufficient and it becomes difficult to reduce the specific gravity (reduce the filler content). From the viewpoint of rigidity, the preferable isotactic pentad fraction is 93% or more, and 94% or more is particularly preferable. This isotactic pentad fraction is the isotactic fraction in the pentad unit in the molecular chain of the propylene polymer, and is described in "Macromolecules" Vol.
It can be measured according to the method described on page 7 (1975).

In the present invention, the isotactic pentad fraction is JNM-EX40 manufactured by JEOL Ltd.
Sample solvent 1,2,4-trichlorobenzene / benzene d ₆ = 9/1, measurement temperature 130 using 0 type NMR apparatus
It is a value obtained by performing ¹³ C-NMR measurement under the conditions of ℃, 4,000 times of integration, pulse angle of 45 ° and pulse interval of 4 sec. Regarding the ratio of each component in this temperature rising fractionation method, the ratio of (b) component amount / [(b) component amount + (c) component amount] weight ratio is in the range of 0 to 0.20. This weight ratio is 0.
When it exceeds 20, the weld appearance of the obtained molded product becomes poor, the low glossiness on the textured surface is insufficient, and flow marks and color unevenness easily occur. From the aspect of appearance and low glossiness on the textured surface, the preferred (b) component /
[Amount of component (b) + amount of component (c)] The weight ratio is in the range of 0 to 0.15, and particularly preferably in the range of 0 to 0.12. In addition, (a) component amount / [(a) component amount + (b) component amount +
(C) Component amount] The weight ratio is in the range of 0.03 to 0.35.
If this weight ratio is less than 0.03, the impact resistance of the obtained molded product is not sufficient, and the weld appearance and low gloss on the textured surface become insufficient, and if it exceeds 0.35, the weld appearance becomes poor. In addition, the low glossiness on the textured surface is insufficient,
Flow marks and color unevenness are likely to occur, and the rigidity is insufficient. From the viewpoint of the balance of appearance, low gloss on the textured surface, impact resistance and rigidity, the preferred amount of (a) component /
[Amount of component (a) + amount of component (b) and amount of component (c)] The weight ratio is in the range of 0.05 to 0.30, and in particular 0.07 to 0.25.
Is preferred.

Further, the crystalline polypropylene polymer-containing composition of the component (A) has a temperature of 230 ° C. and a load of 2.16.
The melt index (MI) measured under the conditions of kgf is preferably in the range of 1 to 100 g / 10 minutes. If the MI is less than 1 g / 10 minutes, the fluidity is low and the moldability is poor, and if it exceeds 100 g / 10 minutes, the mechanical properties of the molded product deteriorate. From the viewpoint of the balance of moldability and mechanical properties, the MI is more preferably 5 to 70 g / 10 minutes, particularly preferably 10 to 40 g / 10 minutes. This MI is a value determined according to JIS K-7210. The crystalline polypropylene polymer-containing composition as the component (A) is not particularly limited as long as it satisfies the above conditions, and may be, for example, a propylene-ethylene block copolymer composition. To 100 parts by weight of the non-crystalline polypropylene and / or propylene-ethylene block copolymer composition, 0.5 parts of thermoplastic elastomers such as amorphous ethylene-α-olefin copolymer elastomer and / or polyethylene-based resins are added. It may be contained at a ratio of about 50 parts by weight. The propylene-ethylene block copolymer composition is mainly composed of a propylene homopolymer or a crystal part consisting of a propylene-ethylene random copolymer having a low ethylene unit content, and an ethylene-containing ethylene unit having a relatively high ethylene unit content. The composition is composed of an amorphous part composed of a propylene random copolymer. In addition, the propylene-ethylene block copolymer composition may be one in which the crystalline part or the amorphous part contains other α-olefin unit such as butene-1 in an appropriate ratio. This propylene
The ethylene block copolymer composition usually has an ethylene unit content of 3 to 30% by weight. This content is 3% by weight
When the amount is less than 1, the resulting molded article has a poor weld appearance, and has a low gloss on the grain surface and an insufficient impact resistance. From the aspects of weld appearance, low gloss on the textured surface, impact resistance, and the like, the preferred ethylene unit content is 4 to 25% by weight, particularly 5 to 20% by weight.

The crystalline polypropylene polymer-containing composition as the component (A) may be produced by any method so long as a crystalline polypropylene polymer-containing composition satisfying the above requirements can be obtained. There are various methods. For example, a method of blending the respective components obtained by separately polymerizing, or, as shown below, (a) (i)
A solid catalyst component composed of magnesium, titanium, a halogen atom and an electron donor, and optionally used (i
i) a solid component composed of crystalline polyolefin,
There is a method of producing a propylene-ethylene block copolymer composition by carrying out multistage polymerization in the presence of a catalyst system consisting of (b) an organoaluminum compound and (c) an electron-donating compound which is usually used. Next, a method for producing a propylene-ethylene block copolymer composition by the multi-stage polymerization method will be described.

In the catalyst system used for this multi-stage polymerization, the solid component (a) is used in combination with the solid catalyst component (i) composed of magnesium, titanium, a halogen atom and an electron donor (if necessary) ( ii) A crystalline polyolefin as a component. The solid catalyst component of component (i) contains magnesium, titanium, a halogen atom and an electron donor as essential components, and can be prepared by contacting a magnesium compound, a titanium compound and an electron donor. it can. In this case, the halogen atom is included as a halide in the magnesium compound and / or the titanium compound. Examples of the magnesium compound include magnesium dihalides such as magnesium dichloride, magnesium oxide, magnesium hydroxide, hydrotalcite, carboxylates of magnesium, alkoxy magnesium such as diethoxy magnesium, aryloxy magnesium, alkoxy magnesium halides, and ants. Roxy magnesium halides, alkyl magnesium such as ethyl butyl magnesium, alkyl magnesium halides or organomagnesium compounds and electron donors, reaction products such as halosilanes, alkoxysilanes, silanols and aluminum compounds can be mentioned. Magnesium halide, alkoxy magnesium, alkyl magnesium and alkyl magnesium halide are preferred. These magnesium compounds may be used alone or in combination of two or more.

As the magnesium compound, a reaction product of metallic magnesium, halogen and alcohol can be used. The metallic magnesium used at this time is not particularly limited, and metallic magnesium having an arbitrary particle size, for example, granular, ribbon-like, powder-like or the like can be used. Further, the surface state of the magnesium metal is not particularly limited, but it is preferable that the surface of the surface is not coated with magnesium oxide. Further, although any alcohol can be used, it has 1 to 1 carbon atoms.
It is preferable to use a lower alcohol of 6, and ethanol is particularly preferable because it gives a solid catalyst component that remarkably improves the expression of catalytic performance. The purity and the water content of the alcohol are not limited, but when an alcohol having a high water content is used, magnesium hydroxide is formed on the surface of the metal magnesium, so the water content is 1% by weight or less, particularly 2000 ppm.
The following alcohols are preferably used, and the lower the water content, the more advantageous.

The type of halogen and / or halogen-containing compound is not limited, and any compound containing a halogen atom in its molecule can be used as the halogen-containing compound. In this case, the type of halogen atom is not particularly limited, but chlorine, bromine or iodine, particularly iodine is preferably used. Among the halogen-containing compounds, halogen-containing metal compounds are particularly preferable. These states, shapes, particle sizes, etc. are not particularly limited and may be arbitrary, and for example, they can be used in the form of a solution in an alcohol solvent (eg ethanol). The amount of alcohol used is 2 to 100 with respect to 1 mol of magnesium metal.
It is selected in the range of 5 to 50 mol, preferably 5 to 50 mol. If the amount of alcohol is too large, it tends to be difficult to obtain a magnesium compound having a good morphology, and if it is too small, the reaction with metallic magnesium may not be carried out smoothly.

The halogen and / or the halogen-containing compound is usually at least 0.0001 gram atom, preferably at least 0.0001 gram atom, per 1 gram atom of metallic magnesium.
It is used in a proportion of 0005 gram atom or more, more preferably 0.001 gram atom or more. If it is less than 0.0001 gram atom, when the obtained magnesium compound is used without being crushed, the carried amount, activity, stereoregularity, morphology of the produced polymer and the like are lowered, and the crushing treatment becomes indispensable, which is not preferable. Further, by appropriately selecting the amount of halogen and / or the halogen-containing compound used, the particle size of the obtained magnesium compound can be arbitrarily controlled.

The reaction itself between the magnesium metal, the alcohol, the halogen and / or the halogen-containing compound can be carried out by a known method. For example, it is a method of obtaining a desired magnesium compound by reacting metallic magnesium, an alcohol, a halogen and / or a halogen-containing compound under reflux, usually for about 20 to 30 hours until generation of hydrogen gas is not observed. Specifically, for example, when iodine is used as the halogen, a method in which metallic magnesium and solid iodine are put into an alcohol and then heated and refluxed, and an alcohol solution of metallic magnesium and iodine is dropped into the alcohol and then added. Examples thereof include a method of heating and refluxing, a method of dropping an alcohol solution of iodine while heating an alcohol solution containing metallic magnesium, and the like. Both methods are preferably carried out in an inert gas atmosphere such as nitrogen gas or argon gas, optionally using an inert organic solvent (for example, saturated hydrocarbon such as n-hexane). Metal magnesium,
Regarding the introduction of the alcohol, the halogen and / or the halogen-containing compound, it is not necessary to add the entire amount to the reaction tank from the beginning, and it may be added in a divided manner. A particularly preferred form is a method in which the alcohol is charged in its entirety from the beginning, and the magnesium metal is divided and charged several times.

In such a case, it is possible to prevent a temporary large amount of hydrogen gas from being generated, which is very desirable from the viewpoint of safety. Also, the size of the reaction tank can be reduced. Furthermore, it becomes possible to prevent the entrainment of alcohol, halogen and / or halogen-containing compound caused by the temporary large generation of hydrogen gas. The number of divisions is
It may be determined in consideration of the scale of the reaction tank, and usually 5 to 10 times is preferable considering the complexity of the operation. Further, it goes without saying that the reaction itself may be a batch type or a continuous type. Furthermore, as a modified method, a small amount of metallic magnesium is first added to the alcohol that has been entirely added from the beginning, the product produced by the reaction is separated and removed in another tank, and then a small amount of metallic magnesium is added again. It is also possible to repeat. When the magnesium compound thus obtained is used for the next preparation of the solid catalyst component, a dried one may be used, or a magnesium compound that has been filtered and washed with an inert solvent such as heptane may be used. In any case, the obtained magnesium compound can be used in the next step without pulverization or classification operation for making the particle size distribution uniform.

Further, as the titanium compound, for example,
Tetramethoxy titanium, tetraethoxy titanium, tetra-n-propoxy titanium, tetraisopropoxy titanium, tetra-n-butoxy titanium, tetraisobutoxy titanium, tetracyclohexyloxy titanium, tetraphenoxy titanium and other tetraalkoxy titanium, titanium tetrachloride, Tetrahalogenated titanium such as titanium tetrabromide and titanium tetraiodide, methoxytitanium trichloride, ethoxytitanium trichloride, propoxytitanium trichloride, n-butoxytitanium trichloride, ethoxytitanium tribromide and other halogenated alkoxytitanium, dimethoxy Titanium dichloride, diethoxytitanium dichloride, dipropoxytitanium dichloride, di-n-butoxytitanium dichloride, diethoxytitanium Examples include dihalogenated dialkoxytitanium such as bromide, trimethoxytitanium chloride, triethoxytitanium chloride, tripropoxytitanium chloride, tri-n-butoxytitanium chloride, and other monohalogenated trialkoxytitanium. Halogen-containing titanium compound,
Titanium tetrachloride is particularly preferable. These titanium compounds may be used alone or in combination of two or more.

As the electron donor, (c)
What was illustrated as an electron donative compound of a component can be used. The solid catalyst component (i) can be prepared by a known method (JP-A-53-43094, JP-A-55-13).
5102, JP-A-55-135103, JP-A-56-18606, JP-A-56-16620.
No. 5, JP-A-57-63309, JP-A-57.
-190004, JP-A-57-300407, JP-A-58-47003).

The composition of the solid catalyst component (i) thus prepared usually has a magnesium / titanium atomic ratio of 2 to
100, the halogen / titanium atomic ratio is in the range of 5 to 100, and the electron donor / titanium molar ratio is in the range of 0.1 to 10. Also,
Examples of the crystalline polyolefin of the component (ii) used as necessary in the preparation of the solid component (a) include, for example,
Polyethylene, polypropylene, polybutene, poly 4-
A crystalline polyolefin obtained from an α-olefin having 2 to 10 carbon atoms such as methyl-1-pentene can be mentioned. This crystalline polyolefin is (1) a method of prepolymerizing propylene in the presence of (1) a combination of the solid catalyst component, an organoaluminum compound and an electron-donating compound used as necessary (preliminary polymerization method). ), (2) In the crystalline powder such as crystalline polyethylene or polypropylene having a uniform particle size, (i) the solid catalyst component and an organoaluminum compound and an electron donating compound (melting point 100 ° C. or higher) optionally used. Can be obtained by using a method of dispersing and (dispersion method), (3) a method of combining the method of (1) and the method of (2), and the like.

In the prepolymerization method (1), the aluminum / titanium atomic ratio is usually selected in the range of 0.1 to 100, preferably 0.5 to 5, and the electron donating compound / titanium molar ratio is set. It is selected in the range of 0 to 50, preferably 0.1 to 2. In (a) solid component, (i) solid catalyst component and (ii)
Regarding the ratio with the crystalline polyolefin, the weight ratio of the component (ii) to the component (i) is usually 0.03 to 200,
It is preferably selected in the range of 0.10 to 50.
Next, as the organoaluminum compound used as the component (b), general formula (I) AlR ¹ _p X _3-p ... (I) [In the formula, R ¹ is an alkyl group having 3 to 20 carbon atoms or Aryl group having 6 to 20 carbon atoms, X is a halogen atom, p is 1 to 3
Indicates the number of. ] Can be mentioned. For example, trialkyl aluminum such as triisopropyl aluminum, triisobutyl aluminum, trioctyl aluminum, diethyl aluminum monochloride, diisopropyl aluminum monochloride,
Dialkyl aluminum monohalides such as diisobutyl aluminum monochloride and dioctyl aluminum monochloride, alkyl aluminum sesquihalides such as ethyl aluminum sesquichloride and the like can be preferably used. These aluminum compounds may be used alone or in combination of two or more.

Further, an electron donating compound is usually used as the component (c) in the catalyst. The electron donating compound is a compound containing oxygen, nitrogen, phosphorus, sulfur, silicon, and the like. Basically, a compound having a performance of improving regularity in propylene polymerization is considered. Examples of such electron-donating compounds include organosilicon compounds, esters, thioesters, amines, ketones, nitriles, phosphines, ethers, thioethers, acid anhydrides, acid halides, acid amides. Examples thereof include aldehydes, aldehydes, organic acids and azo compounds.

For example, diphenyldimethoxysilane, diphenyldiethoxysilane, cyclohexylmethyldimethoxysilane, dicyclopentyldimethoxysilane, diisopropyldimethoxysilane, t-butyl-n-propyldimethoxysilane, dibenzyldimethoxysilane,
Organosilicon compounds such as tetramethoxysilane, tetraethoxysilane, tetraphenoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriphenoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane and benzyltrimethoxysilane, monomethylphthalate, Monoethyl phthalate, monopropyl phthalate, monobutyl phthalate, monoisobutyl phthalate, monoamyl phthalate, monoisoamyl phthalate, monomethyl terephthalate, monoethyl terephthalate, monopropyl terephthalate, monobutyl terephthalate, monoisobutyl terephthalate, dimethyl phthalate, diethyl phthalate, di Propyl phthalate, dibutyl phthalate, diisobutyl phthalate, diami Phthalate, diisoamyl phthalate, methyl ethyl phthalate, methyl isobutyl phthalate, methyl propyl phthalate, ethyl butyl phthalate, ethyl isobutyl phthalate, ethyl propyl phthalate, propyl isobutyl phthalate, dimethyl terephthalate, diethyl terephthalate, dipropyl terephthalate, diisobutyl terephthalate, methyl ethyl terephthalate , Methylisobutylterephthalate, methylpropylterephthalate, ethylbutylterephthalate, ethylisobutylterephthalate, ethylpropylterephthalate, propylisobutylterephthalate, dimethylisophthalate, diethylisophthalate, dipropylisophthalate, diisobutylisophthalate, methylethylisophthalate , Methyl isobutyl isophthalate, methyl propyl isophthalate,
Aromatic dicarboxylic acid esters such as ethyl butyl isophthalate, ethyl isobutyl isophthalate, ethyl propyl isophthalate, propyl isobutyl isophthalate, methyl formate, ethyl formate, methyl acetate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate , Ethyl propionate, methyl butyrate, ethyl butyrate, ethyl valerate, methyl chloroacetate, ethyl dichloroacetate, methyl methacrylate, ethyl crotonate, ethyl bivalate, dimethyl maleate, ethyl cyclohexanecarboxylate, methyl benzoate, benzoic acid ethyl,
Propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, phenyl benzoate, benzyl benzoate, methyl toluate, ethyl toluate,
Amyl toluate, ethyl ethyl benzoate, methyl anisate, ethyl anisate, ethyl ethoxybenzoate, p-
Ethyl butoxybenzoate, ethyl o-chlorobenzoate,
Monoesters such as ethyl naphthoate, γ-butyrolactone, δ-valerolactone, coumarin, phthalide, esters such as ethylene carbonate, organic acids such as benzoic acid, p-oxybenzoic acid, succinic anhydride, benzoic anhydride, anhydrous Acid anhydrides such as p-toluic acid, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, acetophenone, benzophenone and benzoquinone, aldehydes such as acetaldehyde, propionaldehyde, octyl aldehyde, tolualdehyde, benzaldedo, naphthyl aldehyde and acetyl chloride. , Acetyl bromide, propionyl chloride, butyryl chloride, isobutyryl chloride, 2-methylpropionyl chloride, valeryl chloride, isovaleryl chloride, hexanoyl chloride, Methylhexanoyl chloride, 2
-Ethyl hexanoyl chloride, octanoyl chloride, decanoyl chloride, undecanoyl chloride, hexadecanoyl chloride, octadecanoyl chloride,
Benzylcarbonyl chloride, cyclohexanecarbonyl chloride, malonyl dichloride, succinyl dichloride, pentanedioleyl dichloride, hexanedioleyl dichloride, cyclohexanedicarbonyldichloride, benzoyl chloride, benzoyl bromide, methylbenzoyl chloride, phthaloyl chloride, isophthaloyl chloride, terephthaloyl Ilchloride, benzene-
Acid halides such as 1,2,4-tricarbonyl trichloride, methyl ether, ethyl ether, isopropyl ether, n-butyl ether, isopropyl methyl ether, isopropyl ethyl ether, t-butyl ethyl ether, t-butyl-n- Ethers such as propyl ether, t-butyl-n-butyl ether, t-amyl methyl ether, t-amyl ethyl ether, amyl ether, tetrahydrofuran, anisole, diphenyl ether, ethylene glycol butyl ether, acetic acid amide, benzoic acid amide, toluic acid amide Such as acid amides, tributylamine, N, N′-dimethylpiperazine, tribenzylamine, aniline, pyridine, pyrroline, tetramethylethylenediamine, and other amines, acetonite Nitriles such as ril, benzonitrile and tolunitrile, 2,2′-azobis (2-methylpropane), 2,2′-azobis (2-ethylpropane), 2,2′-azobis (2-methylpentane), etc. And an azo compound in which a sterically hindering substituent is bonded to the azo bond of.

Of these, organosilicon compounds, esters, ketones, ethers, thioethers, acid anhydrides and acid halides are preferable, and especially diphenyldimethoxysilane, cyclohexyldimethoxysilane, dicyclopentyldimethoxysilane, t- Organosilicon compounds such as butyl-n-propyldimethoxysilane, di-n-
Aromatic dicarboxylic acid diesters such as butyl phthalate and diisobutyl phthalate, and alkyl esters of aromatic monocarboxylic acids such as benzoic acid, p-methoxybenzoic acid, p-ethoxybenzoic acid and toluic acid are preferable. These electron donating compounds may be used alone or in combination of two or more.

Regarding the amount of each component of the catalyst system used,
The solid component (a) is used in an amount in the range of 0.0005 to 1 mol per liter of reaction volume in terms of titanium atoms. The (b) organoaluminum compound has an aluminum / titanium atom ratio of usually 1 to 30.
An amount of 00, preferably 40 to 800 is used, and if the amount deviates from the above range, the catalytic activity may be insufficient. The case of using the Ziegler-based solid catalyst has been described in detail above, but a metallocene-based catalyst, which has been attracting attention in recent years, can also be used as the catalyst. The crystalline polypropylene polymer-containing composition used as the component (A) can be obtained by various methods. For example, it can be produced by multistage polymerization in the presence of the above-mentioned catalyst system. The polymerization order and the number of polymerization stages in the multistage polymerization can be arbitrarily selected. For example, in the first polymerization (first stage polymerization), propylene homopolymerization or copolymerization (containing 2% by weight or less of ethylene and other olefins) is performed so as to obtain a crystalline propylene polymer, and the second polymerization is performed. After the stage, random copolymerization of ethylene and propylene or random copolymerization of ethylene and propylene with another α-olefin or polyene can be performed. Here, as the other α-olefin, for example, butene-1, pentene-1,
Linear α-olefins such as hexene-1, 3-methylbutene-1; branched α- such as 4-methylpentene-1
Olefins, which may be used alone,
You may use it in combination of 2 or more type. Further, examples of the polyene include dicyclopentadiene and tricyclopentadiene, and these may be used alone or in combination of two or more kinds.

When a propylene-ethylene block copolymer composition is produced, the polymerization conditions are, as described above, that the relaxation time τ of the crystal part [(c) component] is 0.01 to.
0.35 seconds, preferably 0.02 to 0.30 seconds, more preferably 0.02 to 0.25 seconds, and a molecular weight distribution index (PDI)
Is 1-18, preferably 2-16, more preferably 2
14 and the amorphous part [(a) component] has an intrinsic viscosity [η] of 2.0 to 10 deciliter / g, preferably
2.2-9.0 deciliter / g, more preferably 2.4-8.
It may be selected to be 0 deciliter / g.

When carrying out the polymerization by gas phase polymerization, the polymerization pressure is usually 1 to 20 for the homopolymerization stage of propylene.
0 kg / cm ² G, preferably 1 to 100 kg / cm ²
G, the polymerization temperature is usually 40 to 100 ° C., preferably 50 to
It is appropriately selected within the range of 90 ° C. In the ethylene-propylene copolymerization stage and the ethylene-propylene-other α-olefin and polyene copolymerization stage, the polymerization pressure is usually 1 to 150 kg / cm ² G, preferably 1 to 100 k.
g / cm ² G, the polymerization temperature is usually 30 to 100 ° C., and preferably 30 to 80 ° C. At any stage, the molecular weight of the polymer can be adjusted by known means, for example, adjusting the hydrogen concentration in the polymerization vessel. The polymerization time is appropriately selected from about 5 minutes to 10 hours.

In the polymerization, even if the components constituting the catalyst system, that is, the components (a) to (c) are mixed at a predetermined ratio and brought into contact with each other, the monomer is immediately introduced to initiate the polymerization. After the contact, the monomer may be introduced after aging for about 0.2 to 3 hours. Furthermore, this catalyst component can be supplied by suspending it in an inert solvent or olefin. In particular, it is preferable to select the catalyst and the polymerization conditions that ensure the uniformity of the polymerization in the polymerization step of the crystalline polypropylene and do not widen the uniformity of the obtained polymer, that is, the molecular weight distribution. Post-treatment after the polymerization can be performed by a conventional method. That is, in the gas phase polymerization method, after the polymerization, in order to remove the monomers and the like contained in the polymer powder derived from the polymerization vessel,
You may pass a nitrogen stream etc. If desired, pelletizing may be carried out by an extruder, and in this case, a small amount of water, alcohol or the like may be added in order to completely deactivate the catalyst. In the bulk polymerization method,
After the polymerization, the monomer may be completely separated from the polymer discharged from the polymerization vessel and then pelletized. In the resin composition of the present invention, the crystalline polypropylene polymer-containing composition as the component (A) may be used alone or in combination of two or more kinds. Further, if desired, other thermoplastic resin such as polyethylene resin or rubber-like elastic material may be contained as long as the object of the present invention is not impaired.

In the polypropylene resin composition of the present invention, an inorganic filler is used as the component (B). Examples of the inorganic filler include silica, diatomaceous earth, barium ferrite, beryllium oxide, pumice, pumice balloon and other oxides, aluminium hydroxide, magnesium hydroxide,
Hydroxides such as basic magnesium carbonate, carbonates such as calcium carbonate, magnesium carbonate, dolomite and dawsonite, sulfates or sulfites such as calcium sulfate, magnesium sulfate, barium sulfate, ammonium sulfate and calcium sulfite, talc, clay, mica , Asbestos, glass fibers, glass balloons, glass beads, silicates such as calcium silicate, montmorillonite, bentonite, carbons such as carbon black, graphite, carbon fibers, carbon hollow spheres, molybdenum sulfide, boron fibers, boric acid Examples thereof include zinc, barium metaborate, calcium borate, sodium borate, magnesium oxysulfate fiber, and various metal fibers.
These inorganic fillers may be used alone or in combination of two or more, among them, talc, mica, calcium carbonate, magnesium sulfate whiskers,
Glass fiber is preferable, and talc is particularly preferable. The talc has an average particle size of 1 to 8 μm and an average aspect ratio of 4 in terms of the physical properties such as rigidity, impact resistance, scratch whitening resistance, weld appearance, and uneven gloss of the obtained molded product. The above are preferred. In particular, those obtained by the processing and pulverization method are particularly preferable in terms of physical properties, rigidity and the like.

In the resin composition of the present invention, the above (A)
The compounding ratio of the crystalline polypropylene polymer-containing composition as the component and the inorganic filler as the component (B) is in the range of 50 to 100% by weight of the component (A) and 50 to 0% by weight of the component (B). Selected. The component (B) does not need to be blended in particular for improving low gloss and weld appearance, but it is contained in an amount of 1 to 50% by weight, preferably 5 to 40% by weight for improving rigidity and paintability. It is desirable to do. If the content of the component (B) is less than 1% by weight, the obtained molded product has insufficient mechanical properties such as rigidity, and if it exceeds 50% by weight, the weld appearance becomes poor and flow marks are likely to occur. In addition, impact resistance and moldability are reduced. From the aspect of balance of appearance, rigidity, impact resistance, moldability, etc.
The preferable mixing ratio of the components (A) and (B) is (A)
The components are preferably in the range of 60 to 95% by weight and the component (B) in the range of 40 to 5% by weight, and particularly preferably in the range of 65 to 90% by weight of the component (A) and 35 to 10% by weight of the component (B). is there.
In the resin composition of the present invention, known additives such as pigments, nucleating agents, weathering agents, antioxidants, antistatic agents, flame retardants, and dispersants can be added, if desired. There is no particular limitation on the method for preparing the polypropylene resin composition of the present invention. For example, the component (A), the component (B), and the additive components used as necessary are added to a single-screw extruder, a twin-screw extruder, or a Banbury. A method of melt-kneading using a mixer, kneader, roll or the like can be adopted. The automobile interior member of the present invention is obtained by molding the polypropylene resin composition thus obtained by a known injection molding method (including an injection compression molding method and a gas injection injection molding method). You can

[0032]

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

Production Example 1 (1) Preparation of Magnesium Compound After a reaction vessel equipped with a stirrer having an internal volume of 500 liters was sufficiently replaced with nitrogen gas, about 97.2 kg of ethanol, 640 g of iodine and 6.4 kg of magnesium metal were charged. Then, the mixture was reacted under reflux conditions with stirring until no hydrogen gas was generated from the inside of the system to obtain a solid reaction product. The reaction liquid containing the solid reaction product was dried under reduced pressure to obtain a magnesium compound (solid product). (2) Preparation of solid catalyst component In a reaction vessel equipped with a stirrer and having an internal volume of 500 liters, which was sufficiently replaced with nitrogen gas, 30 kg of the magnesium compound (not crushed) obtained in the above (1), and purified heptane 15
0 liters, 4.5 liters of silicon tetrachloride and 4.3 liters of diethyl phthalate were added. Maintaining the system temperature at 90 ° C., add 144 liters of titanium tetrachloride while stirring and add 110
After reacting at ℃ for 2 hours, the solid components are separated to 80 ℃.
Washed with purified heptane. Furthermore, titanium tetrachloride 22
After adding 8 liters and reacting at 110 ° C for 2 hours,
It was thoroughly washed with purified heptane to obtain a solid catalyst component.

(3) Pretreatment of Polymerization 230 L of n-heptane was placed in a reaction vessel having an internal volume of 500 L and equipped with a stirring blade, and 25 kg of the solid catalyst component obtained in the above (2) was added. After adding 0.6 mol of triethylaluminum and 0.4 mol of cyclohexylmethyldimethoxysilane to 1 mol of titanium (Ti) in the solid catalyst component, propylene was added at a propylene partial pressure of 0.3 kg / cm ^2. It was introduced until it reached G and reacted at 25 ° C. for 4 hours. After completion of the reaction, the solid catalyst component was washed several times with n-heptane, carbon dioxide was supplied, and the mixture was stirred for 24 hours.

(4) Production of Propylene-Ethylene Block Copolymer Composition (PB-1) First, as a pre-stage, a polymerization tank (homopolymerization tank) with an internal volume of 200 liters equipped with a stirring blade was subjected to the treatment of the above (3). The solid catalyst component of 3 is converted into Ti atoms at 3 mmol / hr, triethylaluminum at 400 mmol / hr, and cyclohexylmethyldimethoxysilane at 100 mmol / hr.
, The polymerization temperature is 80 ° C, and the propylene pressure is 2
The reaction was carried out at 8 kg / cm ² G. At this time, hydrogen gas was supplied so as to have a predetermined molecular weight (melt index (MI) was used as an index). Next, the powder was continuously extracted from the homopolymerization tank and transferred to a similar random copolymerization tank. As a subsequent stage in this random copolymerization tank, propylene and ethylene were supplied at a polymerization temperature of 55 ° C., and random copolymerization was performed at a pressure of 15 kg / cm ² G. At this time, the supply ratio of propylene to ethylene was adjusted so as to have a predetermined ethylene content. The powder continuously extracted from the random copolymerization tank was granulated to obtain pellets. The MI of this pellet was 15 g / 10 minutes. The MI of the homopolymer powder obtained by the first-stage polymerization was 22 g /
10 minutes.

(5) Preparation of crystalline polypropylene-based polymer-containing composition 95 parts by weight of the propylene-ethylene block copolymer composition (PB-1) obtained in the above (4) was added to EPR [ethylene-propylene copolymer]. Polymer elastomer, propylene unit content: 23% by weight, MI: 0.8 g / 10 minutes (230
C., 2.16 kgf)] in an amount of 5 parts by weight to prepare a crystalline polypropylene polymer-containing composition. About this thing, the item shown in Table 1 was measured according to the method described in the text, and the result is also shown in Table 1.

Production Examples 2 to 5 Production Example 1- (4) was carried out according to Production Example 1- (4) except that the polymerization conditions were partially changed.
Ethylene block copolymer compositions (PB-2 to 5) were obtained. The MI of each copolymer composition is as follows. PB-2: 12 g / 10 min (20 g / 10 min) PB-3: 24 g / 10 min (30 g / 10 min) PB-4: 42 g / 10 min (60 g / 10 min) PB-5: 31 g / 10 min (50 g / 10 minutes) The value in () is the MI of the homopolymer powder obtained by the first-stage polymerization. Thus obtained propylene-
Ethylene block copolymer composition (PB-2 to 5) 95
In parts by weight, as shown in Table 1, EPR (described above) or HD
PE [high-density polyethylene, density: 0.968g / c
m ³ , MI: 5.3 g / 10 minutes (190 ° C, 2.16 kg
f)] was mixed in an amount of 5 parts by weight to prepare a crystalline polypropylene polymer-containing composition. About this thing, the item shown in Table 1 was measured according to the method described in the text, and the result is also shown in Table 1.

Comparative Production Examples 1 to 6 Commercially available propylene-ethylene block copolymer compositions (PBX-1 to 6), EPR (supra) and HDPE (supra) were used at the blending ratios shown in Table 1. A crystalline polypropylene polymer-containing composition was prepared. About this thing, the item shown in Table 1 was measured according to the method described in the text, and the result is shown in Table 1. PBX-1: Idemitsu Petrochemical Co., Ltd., trade name Idemitsu Polypro J750H PBX-2: Idemitsu Petrochemical Co., Ltd. trade name, Idemitsu Polypro J785H PBX-3: Idemitsu Petrochemical Co., Ltd. trade name, Idemitsu Polypro J950H PBX-4: Idemitsu Petrochemical Co., Ltd., trade name Idemitsu Polypro J3050H PBX-5: Commercial product PBX-6: Commercial product

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

Example 1 100 parts by weight of the composition containing the crystalline polypropylene polymer obtained in Production Example 1 was mixed with talc [average particle size: 3.
5 μm (laser method), average aspect ratio: 5] 30 parts by weight were added, and the mixture was kneaded with a biaxial kneader (2FCM) to prepare a molding material.
Length 1350mm, height 300mm, depth 400m under conditions of 0 ℃, mold temperature 45 ℃, molding cycle 100 seconds.
m, 3.5 mm thickness instrument panel for automobile [surface textured surface], molded product for appearance evaluation [Fig. 1], and test piece (75 x 75 x 3 mm)
Was prepared and the physical properties were evaluated according to the following points. The evaluation results are shown in Table 2.

[Evaluation of Test Piece] (1) Flexural Modulus (23 ° C.) The elastic modulus was determined according to JIS K-7203. (2) Izod impact strength (23 ° C.) It was determined according to JIS K-7110. (3) DuPont impact value (−30 ° C.) Test piece: 75 × 75 × 3 mm plate

[Evaluation of Molded Product for Appearance Evaluation] (4) Glossiness of Molded Product (Wrinkled Surface, Flat Surface) It was determined in accordance with JIS K-7105. (5) Weld appearance (evaluation of the black line on the flat surface of the molded product) It was visually evaluated according to the following criteria. A: Weld part cannot be identified. ◯: Weld part is almost unrecognizable. Δ: The weld part can be recognized a little. X: The welded part is noticeable.

[Evaluation of Instrument Panel] (6) Glossiness on Textured Surface Obtained in accordance with JIS K-7105 and expressed as an average value at three points. (7) Appearance of Welds Visual observation was conducted, and even if the spots where welds were easily noticed, they were regarded as pass, and when they were noticeable, they were rejected. (8) Flow mark When the flow mark could not be identified by visual observation, it was regarded as acceptable.

Examples 2-5 and Comparative Examples 1-6 A molding material was prepared in the same manner as in Example 1 using the crystalline polypropylene polymer-containing composition shown in Table 2 and talc. A molded product was prepared and the glossiness and weld appearance of the molded product were evaluated. Further, in Comparative Example 2, the above-mentioned molded article for appearance evaluation was prepared, and in the same manner as in Example 1, an instrument panel for automobile [surface grain surface]
And a test piece (75 × 75 × 3 mm) was prepared, and the physical properties of each were also evaluated. Second of these results
It is shown in the table.

Example 6 and Comparative Example 7 Using only the crystalline polypropylene polymer-containing composition shown in Table 2 (without talc added), a molded article for appearance evaluation was prepared in the same manner as in Example 1 and molded. The glossiness and the weld appearance of the product were evaluated. Table 2 shows the results.

[0048]

[Table 4]

[0049]

[Table 5]

(Note) In Example 6 and Comparative Example 7, 30 parts by weight of talc was added to 100 parts by weight of the composition containing a crystalline polypropylene polymer, with no addition of talc.

[0051]

EFFECTS OF THE INVENTION The polypropylene resin composition of the present invention has an excellent balance of impact resistance and rigidity, has good appearance performance such as weld appearance, and has low gloss, thus omitting matte coating. It is suitable for molding an interior member for automobiles that can be used, and can also be used as a substitute for an ABS resin that has been subjected to a matte coating for imparting weather resistance, for example.

[0052]

[Brief description of drawings]

FIG. 1 is a schematic diagram of appearance-evaluated molded products in Examples and Comparative Examples. The surface of the molded product is a textured surface and the back surface is a flat surface.

[Description of sign]

 1 Weld line 2 Gloss measurement point 2'Gloss measurement point A Gate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Iida 1 Iezaki Kaigan, Ichihara City, Chiba Idemitsu Petrochemical Co., Ltd.

Claims (5)

[Claims] 1. In the temperature-raising fractionation method using (A) o-dichlorobenzene, (a) an o-dichlorobenzene-soluble component at 30 ° C., (b) an o-dichlorobenzene at a temperature higher than 30 ° C. and lower than 105 ° C. It can be separated into a soluble component and (c) an insoluble component of o-dichlorobenzene at 105 ° C, and (1)
Intrinsic viscosity [η] of component (a) (135 ° C, in decalin)
Is 2.0 to 10 deciliter / g, and the angular frequency ω obtained from the melt viscoelasticity measurement of the component (2) (c) is 10 ^0.
Relaxation time τ in / sec is 0.01-0.35 seconds,
Storage elastic modulus (G ′) obtained from melt viscoelasticity measurement is 2 ×
An angular frequency of 10 ² Pa is ω ₁ , 2 × 10 ⁴ P
When the angular frequency such that a was ω _2, ω _2/10
The molecular weight distribution index (PDI) represented by ω ₁ is 1 to 18, and (3) (b) component amount / [(b) component amount +
(C) Component amount] The weight ratio is 0 to 0.20, and (4) (A) component amount / [(A) component amount + (B) component amount +
(C) Component amount] 50 to 100% by weight of a crystalline polypropylene polymer-containing composition having a weight ratio of 0.03 to 0.35
And (B) 50 to 0% by weight of an inorganic filler, a polypropylene resin composition for automobile interior parts. 2. The polypropylene resin composition for an automobile interior member according to claim 1, wherein the crystalline polypropylene polymer-containing composition as the component (A) is a propylene-ethylene block copolymer composition. 3. A crystalline polypropylene polymer-containing composition as component (A) is a crystalline polypropylene resin and / or
Or propylene-ethylene block copolymer composition 1
The polypropylene-based resin composition for an automobile interior member according to claim 1, wherein the thermoplastic resin and / or the polyethylene-based resin is contained in an amount of 0.1 to 50 parts by weight with respect to 00 parts by weight. 4. The polypropylene-based resin composition for an automobile interior member according to claim 1, 2 or 3, wherein the content of the inorganic filler (B) is 40 to 5% by weight. 5. An automobile interior member formed by injection molding the polypropylene resin composition for an automobile interior member according to claim 1, 2, 3 or 4.