JP2001302858A - Polypropylene-based resin composition and molding comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition having excellent transparency, rigidity and processability in molding and excellent appearance of molding. SOLUTION: This polypropylene-based resin composition comprises 80-98 wt.% of a polypropylene-based polymer (1) having a melt tension (MT(190)) at 190 deg.C and MFR at 230 deg.C satisfying formula 1 MT(190)<7.52×MFR(-0.576) (formula 1) and 2.0-5.0 molecular weight distribution (Mw/Mn) and 2-20 wt.% of a polypropylene-based polymer (II) having MT(190) and MFR at 230 deg.C satisfying formula (2) MT(190)>=7.52×MFR(-0.576) (formula 2). The composition has 3.0 to 5.0 Mw/Mn of the whole polypropylene-based resin composition and >=3.8 MT(170) and satisfies formula 3 MT(170)-MT(190)>=1.4 (formula 3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a polypropylene resin composition. More specifically, the present invention relates to a polypropylene-based resin composition having excellent transparency, rigidity, and processability during molding, and having a good appearance when formed into a molded article. Also,
The present invention relates to a molded article made of a polypropylene resin composition.

[0002]

2. Description of the Related Art Conventionally, polypropylene has been produced using a titanium trichloride catalyst, but polypropylene produced using a titanium trichloride catalyst has low stereoregularity and low rigidity. Was. In recent years, in order to improve the stereoregularity of polypropylene and increase rigidity, Ti-
Mg-based catalysts have been developed, and polypropylene having high stereoregularity and high rigidity has been obtained. But,
Compared to polypropylene obtained using a conventional titanium trichloride-based catalyst, polypropylene obtained using a Ti—Mg-based catalyst has a narrow molecular weight distribution and low melt tension. When the melt tension is low, problems such as insufficient workability, for example, low shape stability of a bank formed at the time of bank forming of a sheet occur.

Therefore, it is necessary to increase the melt tension of polypropylene. Conventionally, as a method of increasing the melt tension, a method using a polypropylene composition obtained by blending polyethylene with polypropylene has been known. For example, JP-A-50-8848 describes a polypropylene composition for extrusion coating in which low density polyethylene is blended with polypropylene.
However, when low-density polyethylene is blended, there are problems such as a decrease in rigidity and a decrease in transparency due to mixing of polyethylene having a different refractive index into polypropylene.

On the other hand, Japanese Patent Application Laid-Open No. Hei 8-291205 describes a propylene-based polymer having excellent melt tension produced by two-stage polymerization using a Ti-Mg-based catalyst. However, as described in Examples 10 to 12 of the patent publication, the molded article had rough skin and spots, and had an insufficient appearance. In addition, since the cost of producing a polypropylene polymer by two-stage polymerization or the like is expensive, obtaining a product such as a molded product using the polypropylene polymer produced by two-stage polymerization or the like alone requires a price of the product. Therefore, it has been desired to reduce the amount of the polypropylene polymer produced by two-stage polymerization or the like.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polypropylene resin composition which is excellent in transparency, rigidity and workability at the time of molding and which has a good appearance when formed into a molded product, and a molded product comprising the same. Is to provide.

[0006]

Means for Solving the Problems The present inventors have made intensive studies in view of the above-mentioned situation, and as a result, have found that a specific propylene-based polymer (I) and a specific propylene-based polymer (II) It has been found that the above problems can be solved by using a polypropylene resin composition, and the present invention has been completed. That is, the present invention relates to a method in which the melt tension (MT (190)) at 190 ° C. and 230 ° C.
The melt flow rate (MFR) is as follows (formula 1)
And a molecular weight distribution (Mw / Mn) of 2.0 to 5.0 for the polypropylene-based polymer (I) 8
1. a polypropylene polymer (II) having a melt tension (MT (190)) at 190 ° C. and a melt flow rate (MFR) at 230 ° C. satisfying the following (formula 2): 0.0 to 98.0% by weight; 00-20.0% by weight
And a molecular weight distribution (Mw / M) of the entire polypropylene resin composition.
n) is 3.0 to 5.0, the melt tension (MT (170)) at 170 ° C. is 3.8 or more, and the polypropylene resin composition satisfies the following (formula 3). MT (190) <7.52 × MFR ^(−0.576) (Formula 1) MT (190) ≧ 7.52 × MFR ^(−0.576) (Formula 2) MT (170) −MT (190) ≧ 1.4 ( Equation 3). Further, the present invention relates to a molded article comprising the above-mentioned polypropylene-based resin composition.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. Polypropylene polymer (I) used in the present invention
Are propylene homopolymer and propylene-based random copolymer. The polypropylene-based polymer (I) is preferably a propylene-based random copolymer.

[0008] The propylene-based random copolymer is a propylene-ethylene random copolymer, propylene-α-
An olefin random copolymer and a propylene-ethylene-α-olefin random copolymer.

The propylene-ethylene random copolymer which can be used as the propylene-based random copolymer is a random copolymer obtained by copolymerizing propylene and ethylene, and ethylene is randomly bonded to a propylene chain. It was done. Propylene-α-olefin random copolymer refers to propylene and at least 1
A random copolymer obtained by copolymerizing at least one α-olefin with at least one α-olefin
Olefin is randomly bonded. The propylene-ethylene-α-olefin random copolymer is
A random copolymer obtained by copolymerizing propylene, ethylene and at least one α-olefin, wherein ethylene and at least one α-olefin are randomly bonded to a propylene chain.

The α-olefin is an olefin having 4 to 20 carbon atoms, such as 1-butene, 2-methyl-1-propene, 1-pentene, 2-methyl-1-
Butene, 3-methyl-1-butene, 1-hexene, 2-
Ethyl-1-butene, 2,3-dimethyl-1-butene,
2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1
-Butene, 1-heptene, methyl-1-hexene, dimethyl-1-pentene, ethyl-1-pentene, trimethyl-1-butene, methylethyl-1-butene, 1-octene, methyl-1-pentene, ethyl- 1-hexene,
Dimethyl-1-hexene, propyl-1-heptene, methylethyl-1-heptene, trimethyl-1-pentene, propyl-1-pentene, diethyl-1-butene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and the like. Preferably, 1-butene, 1-
Penten, 1-hexene and 1-octene, more preferably 1-butene and 1-hexene. Also,
These α-olefins may be used in combination of two or more.

Examples of the propylene-α-olefin random copolymer include a propylene-1-butene random copolymer, a propylene-1-pentene random copolymer, a propylene-1-hexene random copolymer and the like. And preferably a propylene-1-butene random copolymer or a propylene-1-hexene random copolymer. As the propylene-ethylene-α-olefin random copolymer, for example, propylene-ethylene-
1-butene random copolymer, propylene-ethylene-
1-pentene random copolymer, propylene-ethylene-1-hexene random copolymer and the like, and preferably propylene-ethylene-1-butene random copolymer or propylene-ethylene-1-hexene random copolymer. is there.

The polypropylene-based polymer (I) used in the present invention has a melt tension (MT (190)) at 190 ° C. and a melt flow rate (MFR) at 230 ° C. of MT (190) <7.52 × MFR
^{(-0.576) It} satisfies the relationship of (Equation (1)), and preferably, MT (190) <7.52 × MFR ^(-0.576)
-0.5 (Equation (1-1)) is satisfied.

230 ° C. of polypropylene-based polymer (I)
The melt flow rate (MFR) in is not particularly limited, but is preferably 0.2 to 10 g / 10 minutes,
More preferably, it is 0.4 to 5.0 g / 10 minutes.

The molecular weight distribution (Mw / Mn) of the polypropylene polymer (I) is from 3.0 to 5.0, preferably from 3.0 to 4.5. Molecular weight distribution (Mw / Mn)
Is less than 3.0, the appearance of a molded article obtained using the polypropylene-based resin composition described in the present specification may be poor, and if it exceeds 5.0, the rigidity is insufficient. Sometimes.

The polypropylene polymer according to the present invention (I)
I) is a propylene homopolymer or a propylene-based random copolymer. Examples of the propylene random copolymer include the propylene random copolymer described above.

The melt tension (MT (190)) at 190 ° C. and the melt flow rate (MFR) at 230 ° C. of the polypropylene polymer (II) used in the present invention are MT (190) ≧ 7.52 × MFR
^{(-0.576) It} satisfies the relationship of (Expression (2)), and preferably, MT (190) ≧ 7.52 × MFR ^{(−0.576 )}
+0.90 (Equation (2-1)) is satisfied.

The content of the polypropylene polymer (I) and the content of the polypropylene polymer (II) in the polypropylene resin composition is 8 for the polypropylene polymer (I).
0.0 to 98.0% by weight (polypropylene polymer (I
I) is 2.00 to 20.0% by weight), preferably 80.0 to 95.0% by weight of the polypropylene-based polymer (I) (5.0 to 20.0% by weight of the polypropylene-based polymer (II)).
0.0% by weight), and more preferably 80.0 to 90.0% by weight of the polypropylene-based polymer (I) (10.0 to 20.0% by weight of the polypropylene-based polymer (II)). . 98.0 polypropylene-based polymer (I)
% (Propylene polymer (II) is 2.0% by weight)
When the propylene polymer (I) is less than 80.0% by weight (propylene polymer (II)), the bank shape at the time of sheet molding becomes poor and the sheet formability deteriorates. ) Exceeds 20% by weight), the appearance of the molded article may be insufficient.

The molecular weight distribution (Mw / Mn) of the polypropylene resin composition described in the present specification is 3.0 to 5.0. Molecular weight distribution (Mw) of the polypropylene resin composition
When (/ Mn) is less than 3.0, the appearance of a molded article obtained using the composition may be insufficient, and when it exceeds 5.0, the rigidity may decrease.

The melt tension (MT (1) at 170 ° C. of the polypropylene resin composition described in the specification of the present application.
70)) is 3.8 or more, and preferably 4.0 or more. When MT (170) is less than 3.8, the appearance of a molded article obtained using the composition may be deteriorated.

Further, the melt tension at 170 ° C. (MT (170)) is at least 1.4, more preferably at least 1.6, greater than the melt tension at 190 ° C. (MT (190)). 170
Melt tension at 17 ° C (MT (170)) and 19
When the difference in the melt tension (MT (190)) at 0 ° C. is less than 1.4, the appearance of a molded article obtained using the composition may be deteriorated.

The propylene polymer (I) used in the present invention
The production method of (II) and (II) is not particularly limited, and examples thereof include a production method using a generally known catalyst. For example, a method using a known catalyst for stereoregular polymerization of propylene may be mentioned.

As a catalyst for stereoregular polymerization of propylene, for example, a Ti—Mg-based catalyst comprising a solid catalyst component in which a Ti compound is complexed with a magnesium compound and the like can be mentioned. In addition, these solid catalyst components may include a third component such as an organoaluminum compound and, if necessary, an electron donating compound.
A catalyst obtained by combining components is also included. Preferably, a catalyst comprising a solid catalyst component containing magnesium, titanium and halogen as essential components, an organic aluminum compound and an electron donating compound is used. For example, JP-A-61-
Catalysts described in JP-A-218606, JP-A-61-287904, JP-A-7-216017 and the like can be mentioned. Further, even when a metallocene catalyst having a molecular weight distribution narrower than that of the Ti—Mg catalyst is used, the molecular weight distribution (M) of the entire polypropylene resin composition is obtained by producing the polypropylene polymer (II) by, for example, multi-stage polymerization.
w / Mn) can be adjusted appropriately to achieve the object of the present invention.

The method for polymerizing the propylene polymers (I) and (II) is not particularly limited, and may be a solvent polymerization method performed in the presence of an inert solvent, or a bulk polymerization method performed in the presence of a liquid monomer. Examples include a polymerization method and a gas phase polymerization method performed in the absence of a substantially liquid medium. Preferably, it is a gas phase polymerization method. In addition, a one-stage polymerization method or a two-stage or more multi-stage polymerization method can be used, and a multi-stage polymerization method is preferable.

In particular, as the polymerization method of the polypropylene polymer (II), a multi-stage polymerization method of two or more stages is preferable. For example, at least one step of producing a crystalline propylene-based polymer component (A) having an intrinsic viscosity of 5.0 dl / g or more by polymerizing a monomer containing propylene as a main component; A continuous polymerization method comprising at least one step of producing a crystalline propylene-based polymer component (B) having an intrinsic viscosity of less than 3.0 dl / g by polymerization, and obtained by this multistage polymerization method. In the polypropylene-based polymer, the crystalline propylene-based polymer component (A) is 0.05% by weight or more and less than 25% by weight, and the crystalline propylene-based polymer component (B) is 25.0% by weight or more and 99.5%. % By weight, and the intrinsic viscosity of the polypropylene-based polymer obtained by this multistage polymerization method is less than 3.0 dl / g, and the molecular weight distribution (Mw / M ) It is mentioned polymerization method to be less than 10.0.

The crystalline propylene-based polymers (A) and (B) are not particularly limited as long as they are crystalline polypropylene. The melting point is 120 ° C. to 176 ° C., and the heat of crystal fusion is 60 J / g or more.
Those in the range of 120 J / g are preferred.

Examples of the method of blending the polypropylene (I) and the polypropylene polymer (II) in the polypropylene resin composition described in the present specification include a method of melt blending and a method of pellet blending during molding. Can be Further, as a method of kneading the polypropylene-based resin composition described in the present specification, a method using a known kneader, for example, a single-screw kneading extruder, using a multi-screw kneading extruder or using a Banbury mixer Method.

The polypropylene resin composition described in the present specification may contain other resins such as polyethylene and rubber as long as the objects and effects of the present invention are not impaired.

The polypropylene resin composition described in the specification of the present invention contains an antioxidant, a neutralizing agent, an ultraviolet absorber, an antifoaming agent, a dispersing agent, as long as the object and effects of the present invention are not impaired. Various auxiliaries such as an antistatic agent, a lubricant, and an antiblocking agent, and a coloring agent may be added.

Further, various nucleating agents may be added to the polypropylene resin composition described in the present specification in order to exhibit transparency. The nucleating agent is not particularly limited, and examples thereof include metal organic phosphates, sorbitol-based nucleating agents, and various metal salts of benzoic acid.From the viewpoint of processing stability, organic metal phosphates are preferably used. Salts, specifically, bis (2,4,8,10-tetra-tert-butyl-6-oxo-12H-dibenzo} [d, g] [1,
2,3] dioxaphosphin-6-oxide) aluminum hydroxide salt and the like.

The molded article described in the present specification is a molded article obtained by molding the polypropylene resin composition described in the present specification. The molding method is not particularly limited, and includes known molding methods such as extrusion molding, injection molding, blow molding, extrusion blow molding, injection blow molding, inflation molding, mold stamping molding, and the like. Thus, an extruded product, an injection molded product, a blow molded product, an extruded blow molded product, an injection blow molded product, an inflation molded product, a mold stamping molded product, and the like can be obtained. As the molding method, an extrusion molding method or an injection molding method is preferable, and an extruded body and an injection molded body are obtained, respectively.

The shape and product type of the extruded product which is the molded product described in the present specification are not particularly limited.
For example, a sheet, a film, a pipe, a hose, an electric wire coating, a filament and the like can be mentioned, preferably a sheet and a film, and more preferably a sheet.

[0032]

The present invention will be described in more detail with reference to the following examples, but it should not be construed that the invention is limited thereto. The evaluation methods used in Examples and Comparative Examples are described below.

(1) Method of preparing samples for measuring physical properties and evaluating formability (1-1) Pelletization Polypropylene-based polymer (I) and polypropylene-based (I)
I) was melt-kneaded at a melting temperature of 220 ° C. to produce pellets. (1-2) Hot press molding After preheating at 230 ° C. for 5 minutes, 230 ° C., 50 kgf / cm ²
After pressing for 5 minutes, a cold press was performed at 30 ° C. and 50 Kg / cm ² for 5 minutes to produce a hot press molded product. (1-3) Sheet processing A sheet having a thickness of 0.4 mm was obtained by a touch roll method using a T-die extruder having a die set temperature of 210 ° C. The cooling roll temperature was 40 ° C. for the touch roll and 70 ° C. for the first front roll.

(2) Measurement of physical properties (2-1) Melt flow rate (MFR, unit: g / 1)
0 minutes) According to JIS K7210, temperature 230 ° C, load 2
1. Measured at 18N. (2-2) Molecular weight distribution (Mw / Mn) P. C. (Gel permeation chromatography) was measured under the following conditions. Model: 150CV type (manufactured by Millipore Waters) Column: Shodex M / S 80 Measurement temperature: 145 ° C Solvent: ortho-dichlorobenzene Sample concentration: 5 mg / 8 mL The calibration curve was prepared using standard polystyrene. Standard polystyrene (NBS706: Mw /
(Mn = 2.0) Mw / Mn was 1.9 to 2.0. (2-3) Melt tension (MT, unit: g) It was measured under the following conditions using a melt tension meter manufactured by Toyo Seiki Co., Ltd. Orifice: L / D = 4 (D = 2 mm) Preheating: 10 minutes Extrusion speed: 5.7 mm / min Take-off speed: 15.6 m / min Measurement temperature: 170 ° C., 190 ° C.

(2-4) Flexural modulus (unit: MPa) Using a molded product obtained by the hot press molding method described above, according to ASTM D747-58T, an automatic reading Olsen stiffness manufactured by Toyo Seiki Co., Ltd. It was measured with a tester. (2-5) Haze (unit:%) The haze was measured according to ASTM D-1003 using a molded product obtained by the hot press molding method described above.

(3) Formability evaluation (3-1) Workability Using the sheet obtained by the sheet processing method described above, the bank shape in the sheet processing was visually observed.
The evaluation was made in four stages (A, B, C, D). (3-2) Evaluation of Sheet Surface The thickness of the sheet obtained by the sheet processing method described above was 0.1 mm.
The surface of the 4 mm sheet is visually observed in four stages (A, B,
C, D).

(Sample) Polypropylene copolymer (I)
As Sumitomo Noblen FH3211AG (manufactured by Sumitomo Chemical Co., Ltd.) as a polypropylene-based copolymer (I
As I), Sumitomo Noblen EL80F1 (manufactured by Sumitomo Chemical Co., Ltd.) was used. As comparative samples, Sumitomo Noblen W101C (manufactured by Sumitomo Chemical Co., Ltd.) and Sumitomo Noblen D101 (manufactured by Sumitomo Chemical Co., Ltd.)
Was used. Table 1 shows the melt tension (MT (190)) at 190 ° C. and the melt flow rate (MFR) at 230 ° C., respectively, 7.52 × MFR ^(−0.576).
And the molecular weight distribution (Mw / Mn).

(Reference sample) As reference samples, Reference Examples 1 to 3 were used as polypropylene polymers composed of the crystalline propylene polymer (A) and the crystalline propylene polymer (B). Table 2 shows the intrinsic viscosities and contents of the crystalline propylene polymers (A) and (B) in Reference Examples 1 to 3. Regarding Reference Examples 1-3, Sumitomo Noblen EL80F1, Sumitomo Noblen W101C and Sumitomo Noblen D101, the melt flow rate (MFR) at 230 ° C., the melt tension at 190 ° C. (MT (190)), and 7.52 × MF, respectively.
The values of R ^(−0.576) are shown in Table 3.

Reference Examples 1 to 3 and Sumitomo Noblen EL
FIG. 1 shows the relationship between the melt flow rate (MFR) at 230 ° C. and the melt tension (MT (190)) at 190 ° C. for each of 80F1, Sumitomo Noblen W101C and Sumitomo Noblen D101, and FIG. 190) = 7.52 x MFR ^{(-0.576 )}
Is shown by a broken line.

Example 1 A composition was obtained by blending 95% by weight of Sumitomo Noblen FH3211AG and 15% by weight of Sumitomo Noblen EL80F. Table 4 shows the physical properties of the obtained composition, Table 5 shows the flexural modulus and transparency (haze), and Table 6 shows the workability.

Example 2 A composition was obtained by blending 90% by weight of Sumitomo Noblen FH3211AG and 110% by weight of Sumitomo Noblen EL80F. Table 4 shows the physical properties of the obtained composition, Table 5 shows the flexural modulus and transparency (haze), and Table 6 shows the workability.

Comparative Example 1 Sumitomo Noblen FH3211AG was used alone. Table 4 shows the physical properties of Sumitomo Noblen FH3211AG, Table 5 shows the flexural modulus and transparency (haze), and Table 6 shows the workability.

Comparative Example 2 A composition was obtained by blending 95% by weight of Sumitomo Noblen FH3211AG and 5% by weight of Sumitomo Noblen W101C. Table 4 shows the physical properties of the obtained composition, Table 5 shows the flexural modulus and transparency (haze), and Table 6 shows the workability.

Comparative Example 3 Sumitomo Noblen FH3211AG 95% by weight and Sumitomo Noblen D101 5% by weight were blended to obtain a composition. Table 4 shows the physical properties of the obtained composition, Table 5 shows the flexural modulus and transparency (haze), and Table 6 shows the workability.

[0045]

[Table 1] Polypropylene polymer

[0046]

[Table 2] Reference sample

[0047]

[Table 3] Physical properties of samples

[0048]

[Table 4] Properties of polypropylene resin composition

[0049]

[Table 5] Flexural modulus and transparency (haze)

[0050]

[Table 6] Workability Bank shape A: Bank surface is smooth B: Fine unevenness is seen on bank surface C: Bank surface is uneven D: Bank surface is wavy in TD direction Sheet surface A: Sheet surface is smooth B: Earthworm pattern Fine irregularities are observed. C: Earthworm-like shallow irregularities are observed. D: Many earthworm-like irregularities are observed.

From the above results, Examples 1 and 2 show that Sumitomo Noblen FH3211AG, which satisfies the requirements of the present invention as the polypropylene polymer (I), and Sumitomo, which satisfies the requirements of the present invention as the polypropylene polymer (II), A polypropylene resin composition comprising Noblen EL80F1 that satisfies the requirements of the present invention and has excellent rigidity (flexural modulus), transparency (haze), workability (bank shape), and appearance (sheet surface). I understand.

On the other hand, Comparative Example 1 does not use the polypropylene polymer (II) and is inferior in rigidity, workability and appearance. In Comparative Examples 2 and 3, Sumitomo Noblen W10, which does not satisfy Formula (2), which is a requirement of the present invention, as a polypropylene polymer (II), respectively.
1C, a composition using Sumitomo Noblen D101, which does not satisfy MT (170) and the formula (3), which are the requirements of the present invention, is inferior in workability and appearance.

[0053]

According to the present invention, there is provided a polypropylene-based resin composition and a molded article having excellent transparency, rigidity and workability in bank molding, and particularly having an excellent appearance when formed into a sheet.

[Brief description of the drawings]

FIG. 1 shows the melt flow rate (MFR) at 230 ° C. and the melt tension (MT) at 190 ° C.
(190)), and the broken line in the figure indicates MT (19).
0) = 7.52 × MFR ^(−0.576) .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhisa Kitano 5-1, Anesaki Beach, Ichihara-shi, Chiba F-term (reference) in Sumitomo Chemical Co., Ltd. 4F071 AA20 AA80 AA81 AF14 AF30 AH03 AH04 AH19 BA01 BB05 BB06 BC01 BC05 4J002 BB121 BB122 BB141 BB142 BB151 BB152 GG02 GK01 GQ01

Claims (10)

[Claims] A melt tension (MT) at 190 ° C.
(190)) and a polypropylene polymer having a melt flow rate (MFR) at 230 ° C. satisfying the relationship of the following (Equation 1) and a molecular weight distribution (Mw / Mn) of 3.0 to 5.0 ( I) 80.0-98.0% by weight and 19
Melt tension at 0 ° C. (MT (190)) and 2
A polypropylene polymer (II) having a melt flow rate (MFR) at 30 ° C. satisfying the following (formula 2).
2.0 to 20.0% by weight, wherein the molecular weight distribution (Mw / Mn) of the entire polypropylene resin composition is 3.0 to 5.0, and at 170 ° C. Melt tension (MT (17
0)) is 3.8 or more, and satisfies the following (formula 3). MT (190) <7.52 × MFR ^(−0.576) (Formula 1) MT (190) ≧ 7.52 × MFR ^(−0.576) (Formula 2) MT (170) −MT (190) ≧ 1.4 ( Equation 3) 2. The method according to claim 1, wherein the polypropylene polymer (I) is at 190 ° C.
Melt tension (MT (190)) at 230
The melt flow rate (MFR) at 0 ° C. is
-1) and the molecular weight distribution (Mw / M
n) is 3.0 to 4.5, and the content is 80.0 to
The polypropylene resin composition according to claim 1, wherein the content is 90.0% by weight. MT (190) ≦ 7.52 × MFR ^(−0.576) −0.5 (Formula 1-1) 3. The method according to claim 1, wherein the polypropylene-based polymer (II) comprises 190
Melt tension (MT (190)) at 23 ° C. and 23
The polypropylene resin composition according to claim 1, wherein the melt flow rate (MFR) at 0 ° C satisfies the relationship of the following (Formula 2-1), and the content is 10 to 20% by weight. MT (190) ≧ 7.52 × MFR ^(−0.576) +0.90 (Formula 2-1) 4. The polypropylene resin composition has a molecular weight distribution (Mw / Mn) of 3.0 to 4.5, a melt tension (MT (170)) at 170 ° C. of 4.0 or more, and The polypropylene resin composition according to claim 1, wherein the following formula (3-1) is satisfied. MT (170) −MT (190) ≧ 1.6 (Equation 3-1) 5. A polypropylene polymer (II) polymerizes a monomer containing propylene as a main component and has an intrinsic viscosity of 5.0.
dl / g or more crystalline polypropylene polymer component (A) at least one step of producing 0.05% by weight or more and less than 25.0% by weight; 25.0% by weight of a crystalline polypropylene polymer component (B) of less than 3.0 dl / g
The intrinsic viscosity is less than 3.0 dl / g, and the molecular weight distribution (Mw / M) is obtained by a continuous production method comprising at least one step for producing at least 99.5% by weight or less.
n) is less than 10 (II)
The polypropylene resin composition according to claim 1, which is I). 6. An intrinsic viscosity of the crystalline propylene polymer component (A) in the polypropylene polymer (III) is 6.0 dl / g or more, and is 5.0 to 20.0% by weight. The polypropylene resin composition according to claim 5, wherein 7. The intrinsic viscosity of the crystalline propylene polymer component (B) in the polypropylene polymer (III) is 2.5 dl / g or less, and 80.0 to 95.0% by weight.
The polypropylene resin composition according to claim 5, wherein 8. The intrinsic viscosity of the polypropylene polymer (III) is 2.5 dl / g or less, and the molecular weight distribution (Mw /
Mn) is 8.5 or less, The polypropylene resin composition of Claim 5 characterized by the above-mentioned. 9. A molded article comprising the polypropylene resin composition according to claim 1. 10. The molded article according to claim 9, wherein the molded article is a sheet.