JPH09302108A - Polypropylene resin composition for extrusion film and extrusion film using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition comprising a crystalline polypropylene, ethylene-propylene-butene-1 copolymer, etc., and having good softness, transparency, antiblocking property and scratch resistance. SOLUTION: This resin composition is obtained by blending (A) 100 pts.wt. crystalline polypropylene with (B) 10-50 pts.wt. ethylene propylene-butene-1 copolymer, (C) 0.05-0.30 pts.wt. antistatic agent and (D) 0.3-1.5 spherical inorganic inert substance having 1-10μm average particle diameter as an antiblocking agent. Furthermore, the component B is preferably composed of 30-50wt.% ethylene component, 20-40wt.% propylene component and 50-10wt.% butene-1 component and the component C is preferably a glycerol fatty acid ester and the component D comprises preferably silica or zeolite-based inorganic particles.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polypropylene resin composition for an extruded film. Specifically, when it is extruded, it has good flexibility, transparency, anti-blocking property, and scratch resistance, has good antistatic properties in the early stages after film formation, and also has an odor after corona discharge treatment. The present invention relates to a polypropylene resin composition capable of giving a good film.

[0002]

2. Description of the Related Art Conventionally, vinyl chloride resins, ethylene-vinyl acetate copolymers and the like have been used for applications requiring flexibility and antistatic properties. Particularly in the field of fiber packaging films, vinylon films are often used. But,
Vinylon films are greatly affected by humidity, and have drawbacks such as the film properties fluctuating greatly depending on the season, such as being too soft in the rainy season and becoming hard in the winter, and being expensive. As a result, the market is relatively inexpensive and has little seasonal impact, transparency, flexibility, anti-blocking,
A polyolefin film having a good balance between antistatic properties and odor has been demanded and is being actively developed.

Extruded films of polypropylene are widely used as packaging materials because they have good physical properties, are inexpensive, and have relatively good heat resistance. However, since the flexibility of the film at low temperature is poor, an improvement method thereof is an ethylene-propylene copolymer or a propylene-butene-1 random copolymer obtained by copolymerizing 6 wt% or more of ethylene (see JP-A-53-53). 79984, 54-85293, 6
No. 0-152516) has been proposed. As another method, a composition comprising crystalline polypropylene and an ethylene-propylene copolymer rubber has been used.

[0004] Generally, in an extruded film of a polypropylene resin composition, adhesion between the films, that is, so-called blocking easily occurs. As an improvement method, as an anti-blocking agent, inorganic particles such as zeolite and silica having a BET specific surface area of 200 m ² / g or less and a bulk specific gravity of 0.2 or more (JP-A-56-4642), and O of the particle surface are used.
A method has been proposed in which inorganic particles such as zeolite or silica having an H group content of 200 μmol / g or less (Japanese Patent Laid-Open No. 4-22044) are added.

Further, since the electric insulation resistance is large, static electricity is easily generated and accumulated due to friction, and adhesion of dust or the like becomes a problem. As a method for improving it, it is known to add glycerin fatty acid ester, amine, amide or the like as an antistatic agent during molding.

Further, the usual polypropylene resin composition is a non-polar plastic, and it is also known to perform corona discharge treatment in order to improve the affinity with the printing ink during printing.

[0007]

However, in the above method, when the ethylene content or butene-1 content of the copolymer is increased to obtain flexibility at a sufficiently low temperature, the transparency and electrostatic properties of the film are increased. The anti-blocking property is good but the anti-blocking property is poor.

When the above-mentioned inorganic particles are added up to the amount necessary to obtain a sufficient anti-blocking property, the transparency and gloss of the film deteriorate. Further, there is a problem in that the scratches on the surface due to the rubbing of the films due to the shape and hardness of the surface protrusions of the film, that is, the scratch resistance becomes poor.

If the above-mentioned antistatic agent is added in an amount necessary for obtaining sufficient antistatic property, problems such as deterioration of transparency of the film and embossing occur. In the composition obtained by combining the above ethylene-propylene random copolymer or propylene-butene-1 random copolymer with fine particles such as silica and the antistatic agent, the antistatic property in the initial stage after film formation is poor. Further, there is a problem that the balance of flexibility, antiblocking property, transparency, antistatic property, slip property, and scratch resistance is poor.

Further, when the corona discharge treatment is performed in order to further improve the affinity with the printing ink, there is a problem that the odor of the film becomes poor.

The present invention solves the above-mentioned drawbacks of the prior art and has a good balance of flexibility, anti-blocking property, transparency, antistatic property, slip property and scratch resistance, and has an odor after corona discharge treatment. It is an object of the present invention to provide a resin composition for a good extruded film.

[0012]

Means for Solving the Problems The present inventors have solved the above problems and have good flexibility, transparency, antiblocking property, and scratch resistance, and have good antistatic property at an early stage after film formation. The present invention has been completed through intensive studies to develop a polypropylene resin composition for an extruded film, which has good odor after corona discharge treatment.

That is, the present invention is a polypropylene resin composition for an extruded film, comprising a crystalline polypropylene, an ethylene-propylene-butene-1 copolymer, an antistatic agent, and an antiblocking agent. 100 parts by weight of ethylene-propylene-
The butene-1 copolymer is 10 to 50 parts by weight, the antistatic agent is 0.05 to 0.30 parts by weight, and the anti-blocking agent has an average particle diameter of 1 to 10 μm and a spherical inorganic inert material of 0.3. It is a polypropylene resin composition for an extruded film, which comprises from about 1.5 parts by weight. The present invention also has a surface gloss of 130% or more and a Young's modulus of 50 kg / mm, which is obtained by extrusion-molding the polypropylene resin composition for an extruded film.
² or less, the initial surface resistivity is 1 × 10 ¹² Ω or less, and the odor is good even after the corona discharge treatment so that the surface tension on the film surface is 42 dyne / cm or more. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The crystalline polypropylene in the present invention is not particularly limited as long as it is a crystalline polypropylene, but isotactic polypropylene has an isotactic pentad fraction of 0 measured by ¹³ C-NMR. A highly stereoregular propylene homopolymer or a propylene-ethylene random copolymer of 90 or more is preferable, and syndiotactic polypropylene has a high syndiotactic pentad fraction of 0.70 or more measured by ¹³ C-NMR. Those having stereoregularity are preferably used, and a copolymer with ethylene or an α-olefin having 4 or more carbon atoms can also be used. In both isotactic polypropylene and syndiotactic polypropylene, the content of ethylene and / or α-olefin having 4 or more carbon atoms in the copolymer is preferably 6% by weight or less.

As the molecular weight of these crystalline polypropylenes, the melt flow index measured at 230 ° C. is 0.1 to 100 g / 10 min, preferably 0.3 to 8
It is preferable to use 0 g / 10 min in terms of the physical properties of the extruded film.

In the present invention, the ethylene-propylene-butene-1 copolymer is preferably 30 to 50 parts by weight of ethylene component, 20 to 40% by weight of propylene component,
An ethylene-propylene-butene-1 copolymer containing 50 to 10% by weight of butene-1 component is used. If the ethylene component is less than 30% by weight, the desired flexibility cannot be obtained, and if the ethylene component is more than 50% by weight, the embossment with time deteriorates, which is not preferable. In addition, the propylene component is 20
When the amount is less than 10% by weight and the butene-1 component is more than 50% by weight, or the propylene component is more than 40% by weight and the butene-1 component is less than 10% by weight,
It is not preferable because the balance between flexibility and embossment over time deteriorates.

The ethylene-propylene-butene-1 copolymer in the present invention is ethylene, propylene, butene-
The catalyst used, which is obtained by terpolymerizing 1 and is not particularly limited, is preferably a catalyst that can give a crystalline copolymer. There is no particular limitation as long as it is easily available on the market. Alternatively, a commercially available ethylene-propylene copolymer, propylene-butene-1 copolymer or ethylene-butene-1 copolymer may be mixed in such a ratio that ethylene, propylene and butene-1 are mixed. good. Here, the molecular weight of the ethylene-propylene-butene-1 copolymer is generally about 0.5 to 3.0 dl / g as an intrinsic viscosity measured with a 135 ° C. tetralin solution.

The ratio of the ethylene-propylene-butene-1 copolymer used in the present invention to 100 parts by weight of crystalline polypropylene is 10 to 50 parts by weight.
If it is less than this range, there is no improvement effect on the flexibility, and if it is more than this range, the flexibility is not particularly improved, and the transparency and anti-blocking property are rather lost, which is not preferable. Particularly preferred is 20 to 40 parts by weight.

As the antistatic agent in the present invention, those generally used for polyolefin films can be used. For example, (1) cationic amines such as primary amine salts, tertiary amines, quaternary ammonium compounds, and pyridine derivatives; (2) sulfated oils, soaps, sulfated ester oils, sulfated amide oils , Sulfates of olefins,
Anionic salts such as fatty alcohol sulfate ester salts, alkyl sulfate ester salts, fatty acid ethyl sulfonate salts, alkylnaphthalene sulfonate salts, alkylbenzene sulfonate salts, succinic acid ester sulfonate salts, and phosphoric acid ester salts, (3) Many Partial fatty acid ester of polyhydric alcohol, ethylene oxide adduct of fatty alcohol, ethylene oxide adduct of fatty acid, ethylene oxide adduct of alkylphenol, ethylene oxide adduct of alkylphenol, ethylene oxide adduct of partial fatty acid ester of polyhydric alcohol Generally, nonionic compounds such as polyethylene glycol and amphoteric compounds such as (4) carboxylic acid derivatives and imidazoline derivatives can be used, but especially nonionic compounds, especially glycerin fatty acid ester is used. Further preferred in view of odor after discharge treatment.

Crystalline polypropylene 1 of the above antistatic agent
As an addition ratio to 00 parts by weight, 0.05 to 0.3
Parts by weight. If the amount is less than this, the effect of improving the antistatic property is not obtained, and if the amount is too large, the effect is not particularly improved. Particularly preferred is 0.08 to 0.25 part by weight.

In the present invention, as an anti-blocking agent
Is a spherical inorganic type with an average particle size of 1 to 10 μm.
Active substance, for example, silica, zeolite-based inorganic
It is a compound particle. As such, the BET method
20m specific surface area measured by ^Two/ G or less, oil absorption is 5
Below 0ml / 100g antistatic agent floats over time
It is preferable in terms of starting. Such a spherical antiblock
If you use an indeterminate type without using the
The odor after discharge is the same as the spherical one, but it is transparent
Will be defective and scratch resistance will deteriorate.

The proportion of the anti-blocking agent, which is the above-mentioned inorganic inert particles, to be used per 100 parts by weight of crystalline polypropylene is 0.3 to 1.5 parts by weight. If it is less than this range, there is no blocking preventing effect, and if it is more than that, it is not particularly improved, and transparency is lost, which is not preferable. Particularly preferred is 0.5 to 1.3 parts by weight.

What is important in the present invention is that an ethylene-propylene-butene-1 copolymer having a specific composition ratio, an antiblocking agent which is a spherical inorganic inert particle, and an antistatic agent which is a glycerin fatty acid ester are used in combination. That is the main effect.

As a method for obtaining a polypropylene resin composition for an extruded film in the present invention, any of the known methods, for example, an extrusion melt blending method, a Banbury blending method, etc., can be used to obtain the above-mentioned crystalline polypropylene, ethylene-propylene-butene- It can be obtained by uniformly dispersing the 1-copolymer, the antistatic agent and the antiblocking agent in the above weight ratio. Further, the antistatic agent and the antiblocking agent can be used even if they are added as a masterbatch obtained in advance as a mixture with crystalline polypropylene or the like as long as the physical properties of the obtained resin composition are not affected.

In the composition of the present invention, needless to say, commonly used stabilizers such as phenol-based and phosphorus-based antioxidants, fatty acid metal salts and basic inorganic neutralizing agents are used. , Slip agent, nucleating agent, antistatic agent,
Additives such as an anti-blocking agent can be appropriately added as needed.

The extruded film of the present invention is an unstretched film obtained by forming the polypropylene resin composition by a known method such as a melt extrusion method such as a T-die method and an inflation method, and the thickness of the film is particularly limited. However, the thickness is preferably 5 to 150 μm, more preferably 15
１００100 μm.

The extruded film of the present invention is dry laminated or extruded with other films, for example, polypropylene biaxially stretched film, unstretched nylon film, stretched nylon film, stretched polyterephthalate ethyl film, aluminum foil, papers and the like. It can be used as a composite film formed by a known method such as laminating or a co-extruded composite film by a T-die method or an inflation method, and the thickness of the unstretched film layer is particularly limited for such a purpose. However, the thickness is preferably 5 to 150 μm, more preferably 15 to 100 μm.

The film obtained by extrusion molding using the polypropylene resin composition for an extruded film of the present invention has good antistatic properties in the early stage after film formation, and has flexibility, transparency, slipperiness, The film has scratch resistance between the films, so-called scratch resistance, and has an antistatic property such that the initial specific surface resistivity, which is expressed as an index of antistatic property, is 1 × 10 ¹² Ω or less. Further, when the film is subjected to corona discharge treatment, the odor of the film is good.

The extruded film of the present invention has flexibility, transparency,
It has excellent antistatic properties, feels good on the skin, and exhibits extremely stable antistatic properties in the early stages after film formation, so there are no problems due to static electricity in the secondary processing and packaging processes. Since it has a good odor after the electric discharge treatment, it is an economically excellent film as a vinylon substitute film for fiber packaging and the like.

The extruded film of the present invention can be subjected to surface treatment such as flame treatment other than corona discharge treatment which is usually employed in industry.

[0031]

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. In the examples, each measurement item was measured based on the following method. (1) Melt flow index: ASTM-D123
Compliant with 8. (2) Haze: According to ASTM-D1003. (3) Visual transparency: LIGHT SC manufactured by Toyo Seiki Co., Ltd.
The LS value (narrow-angle diffuse transmission value) was measured using ATTERING METER. (4) Surface gloss: According to ASTM-D523-62T. (5) Flexibility: According to ASTM-D3420 at 5 ° C. (6) Young's modulus: based on ASTM-D882. (7) Yield point stress: Based on ASTM-D882. (8) Anti-blocking property: Two films cut into a predetermined size are superposed, weighted with 20 g / cm ² and left in a constant temperature room at 23 ° C. and 35 ° C., respectively, and then taken out from the constant temperature room. The contact area ratio was visually determined. (9) Antistatic property: After film formation, after conditioning for 72 hours at a temperature of 23 ° C. and a relative humidity of 60%, a SM-10E type ultra-ultra-insulator manufactured by Toa Denpa Kogyo Co., Ltd. was used. −
The surface resistivity was measured according to K6911. (10) Embossing: After film formation, the haze was measured after 20 days of treatment in a circulating constant temperature bath heated to 35 ° C and 50 ° C. (11) Friction coefficient (tan θ): using a friction measuring machine manufactured by Toyo Seiki Co., Ltd., after film formation, heat treatment was carried out for 1 day in a circulating constant temperature bath heated to 35 ° C. After the lapse of time, the slip property is measured under the following conditions, the angle (θ) at which the block load starts to slide is read, and displayed as tan θ. (Measurement conditions: tilt speed 2.7 ° / sec, block area 6.3 cm × 6.3 cm, load 200 g) (12) Odor: Surface tension on the roll side of the film is 4
Perform corona discharge treatment so as to be 2 dyne / cm,
The treated film is cut into 30 cm × 20 cm. Five cut films were placed in a 500 ml wide-mouth bottle, allowed to age for 1 hour in a circulating thermostat heated to 50 ° C., and the odor in the bottle was determined by a sensory test thereafter. The judgment (the majority of the five examiners) was evaluated as ○ if there was no odor, Δ if there was a slight odor, and × if there was a very bad odor.

[Reference Example] [Adjustment of catalyst] A vibration mill equipped with four grinding pots having an inner volume of 4 liters and containing 9 kg of steel balls having a diameter of 12 mm is prepared. 300 g of magnesium chloride, 115 ml of diisobutyl phthalate, and 60 ml of titanium tetrachloride were added to each pot in a nitrogen atmosphere, and pulverized for 40 hours. Co-crushed material 5
g was placed in a 200 ml flask, 100 ml of toluene was added, and the mixture was stirred at 114 ° C. for 30 minutes, and then allowed to stand to remove the supernatant. Then, the solid content was washed three times at 20 ° C. with 100 ml of n-heptane, and 100 ml of n-heptane was further washed.
It was dispersed in heptane to obtain a transition metal catalyst slurry. The obtained transition metal catalyst component contains 1.8 wt% of titanium,
It contained 18% by weight of diisobutyl phthalate.

[Production of Propylene-Ethylene Copolymer]
25 kg of propylene was charged into a jacketed autoclave having an inner volume of 100 liters sufficiently dried, purged with nitrogen, and further substituted with propylene to prepare for polymerization.
On the other hand, n-heptane 500 m
l, 1.5 ml of triethylaluminum, 2.2 ml of cyclohexylmethyldimethoxysilane, and 0.30 g of the transition metal catalyst component obtained as a result of the above-mentioned catalyst preparation as a solid content were mixed, and the mixture was pressed into the prepared 100-liter autoclave. did. Next, after charging hydrogen and ethylene in a predetermined amount, the jacket is passed through warm water at an internal temperature of 70 ° C., and the respective gaseous phase concentrations are 3.0 mol% of hydrogen and 3.0 of ethylene.
Propylene was continuously charged at 5 kg / h while hydrogen and ethylene were charged so as to maintain the mol%, and after 3 hours, 6.0 ml of diethylene glycol monoisopropyl ether was injected after 3 hours, and further at 60 ° C. for 30 minutes. The polymerization was completed by stirring.

[Post-treatment] The obtained copolymer slurry is
The inner diameter of the slender part is 15 cm, the inner diameter of the upper thick part is 30 cm, the length of the slender part is 5 m, and the length of the upper thick part is 50 m / h. Introduces a propylene washing liquid at a rate of 100 kg / h, and applies a washing liquid of 110 kg / h from above the countercurrent washing tower and a copolymer slurry washed from below 40 kg / h.
Remove with h. The copolymer slurry thus taken out was discharged into a cyclone maintained at atmospheric pressure through a double pipe which can be heated through a steam of 1 kg / cm ² gauge in an outer pipe having an inner diameter of 20 cm and a length of 60 m, and then heated. Furthermore, it dried at 50 degreeC and 60 mmHg for 10 hours, and was 13.3.
kg of crystalline polypropylene (propylene-ethylene copolymer) was obtained. The ethylene content in the crystalline polypropylene thus obtained was 4.2 wt%, 230
Melt flow index (hereinafter referred to as MFI
It is written. ) Was 8.3 g / 10 min.

Example 1 100 parts by weight of the crystalline polypropylene (propylene-ethylene copolymer) obtained in Reference Example was mixed with ethylene-propylene-
Butene-1 copolymer (manufactured by Mitsui Petrochemical Co., Ltd., RS1
805, ethylene content 45% by weight, propylene content 30% by weight, butene-1 content 25% by weight. Below, EL
It is abbreviated as / PL / BL copolymer. ) 20 parts by weight, phosphorus antioxidant 0.11 parts by weight, phenolic antioxidant 0.08 parts by weight, glycerin fatty acid ester as an antistatic agent (Rikenal S-10 manufactured by Riken Vitamin Co., Ltd.)
0A), 0.10 parts by weight, spherical silica (Admafine SO-C5, manufactured by Admatechs Co., Ltd., average particle diameter 1.8 μm, specific surface area 2) as an anti-blocking agent (hereinafter abbreviated as AB agent). ~4m ² / g, an oil absorption of 16
0.8 parts by weight (ml / 100 g) were mixed with a 20 liter Henschel for 2 minutes and granulated with a 65 mmφ extruder. The pellets were melt-extruded with a 40 mmφT die at a resin temperature of 240 ° C. to obtain an unstretched film having a thickness of 40 μm. Table 1 shows the evaluation results.

Example 2 Example 1 was repeated except that the amount of the EL / PL / BL copolymer added was changed to 40 parts by weight. Table 1 shows the evaluation results.

Example 3 15 parts by weight of an EL / PL / BL copolymer as an elastomer and a propylene-butene-1 copolymer (M2481, manufactured by Mitsui Petrochemical Co., Ltd., propylene content 15% by weight, hereinafter PL / BL copolymer.) The same as Example 1 except that 5 parts by weight was used. Table 1 shows the evaluation results.

Comparative Example 1 Instead of EL / PL / BL copolymer, ethylene-propylene copolymer (Mitsui Petrochemical Co., Ltd., P280, hereinafter,
It is abbreviated as EL / PL copolymer. ) Same as Example 1 except that 20 parts by weight was used. Table 1 shows the evaluation results.

Comparative Example 2 Hydrogenated styrene-butadiene copolymer (manufactured by Nippon Synthetic Rubber Co., Ltd., Dynaron 1 instead of EL / PL / BL copolymer)
320P, hereinafter abbreviated as HSBR. ) Same as Example 1 except that 20 parts by weight was used. Table 1 shows the evaluation results.

Comparative Example 3 Ethylene-butene-1 in place of EL / PL / BL copolymer
The procedure of Example 1 was repeated except that 20 parts by weight of a copolymer (A4090 manufactured by Mitsui Petrochemical Co., Ltd., hereinafter abbreviated as EL / BL copolymer) was used. Table 1 shows the evaluation results.

[0041]

[Table 1] Example 4 Example 4 was repeated except that the amount of the AB agent added was 0.5 part by weight. Table 2 shows the evaluation results.

Example 5 Example 5 was repeated except that the amount of the AB agent added was 1.3 parts by weight. Table 2 shows the evaluation results.

Comparative Example 4 The procedure of Example 1 was repeated except that the amount of the AB agent added was 0.1 part by weight. Table 2 shows the evaluation results.

Comparative Example 5 The procedure of Example 1 was repeated except that the amount of the AB agent added was 1.8 parts by weight. Table 2 shows the evaluation results.

Comparative Example 6 The AB agent was replaced with spherical silica, and amorphous silica (manufactured by Fuji Silysia Chemical Ltd., Sylysia 350, average particle size 1.
8 μm, specific surface area 300 m ² / g, oil absorption 310 ml /
Same as Example 1 except that 100 g) was used. Table 2 shows the evaluation results.

Example 6 The same as Example 1 except that the addition amount of the antistatic agent was 0.15 parts by weight. Table 2 shows the evaluation results.

Example 7 Same as Example 1 except that 0.10 part by weight of glycerin fatty acid ester and 0.05 part by weight of amide type (Armost TM310 manufactured by Lion Akzo Co., Ltd.) were used as the antistatic agent. . Table 2 shows the evaluation results.

[0048]

[Table 2]

[0049]

EFFECT OF THE INVENTION A molded product is obtained by using the crystalline polypropylene of the present invention, an ethylene-propylene-butene-1 copolymer having a specific composition, an antiblocking agent which is a spherical inorganic inert particle, and an antistatic agent in combination. Transparency,
Good flexibility, anti-blocking property, scratch resistance, good antistatic property in the early stage after film formation, and by using glycerin fatty acid ester as an antistatic agent, odor of corona discharge treatment A polypropylene resin composition capable of giving a good film is obtained, which is industrially superior.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area C08L 23/12 LCD C08L 23/12 LCD 23/18 LCF 23/18 LCF // B29K 23:00 B29L 7:00 (72) Inventor Takayuki Yamada 1-6 Takasago, Takaishi-shi, Osaka Mitsui Toatsu Chemical Co., Ltd. (72) Yoshito Imabayashi 1-6 Takasago, Takaishi-shi, Osaka Mitsui Toatsu Chemical Co., Ltd. Within

Claims (6)

[Claims] 1. A polypropylene resin composition for an extruded film, comprising a crystalline polypropylene, an ethylene-propylene-butene-1 copolymer, an antistatic agent, and an antiblocking agent, and 100 parts by weight of the crystalline polypropylene. On the other hand, the ethylene-propylene-butene-1 copolymer is 10 to 50 parts by weight, and the antistatic agent is 0.05 to 0.30.
By weight, the average particle size of the anti-blocking agent is 1 to 1.
A polypropylene resin composition for an extruded film, which comprises 0.3 to 1.5 parts by weight of a 10 μm spherical inorganic inactive substance. 2. The ethylene-propylene- according to claim 1.
The butene-1 copolymer has an ethylene component of 30 to 50.
% By weight, propylene component 20-40% by weight, butene-1
A polypropylene resin composition containing 50 to 10% by weight of a component. 3. A polypropylene resin composition in which the antistatic agent according to claim 1 is glycerin fatty acid ester. 4. A polypropylene resin composition in which the spherical inorganic inert material according to claim 1 is silica or zeolite inorganic compound particles. 5. The surface gloss obtained by extrusion molding the polypropylene resin composition for extruded film according to claim 1 is 130.
%, The Young's modulus is 50 kg / mm ² or less, and the initial surface specific resistance is 1 × 10 ¹² Ω or less. 6. The polypropylene resin composition for an extruded film according to claim 1 is extruded and has a good odor even after corona discharge treatment so that the surface tension on the film surface is 42 dyne / cm or more. An extruded film.