JPH09183871A - Polyolefin resin composition and film / sheet comprising the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a polyolefin resin composition having excellent whitening resistance and calender moldability and excellent processability, and a film / sheet thereof. SOLUTION: The resin composition comprises 100 parts by weight of polypropylene and 10 to 800 parts by weight of polyethylene, the MFR of polypropylene is 1 to 10 g / 10 minutes, the polyethylene has (Mw / Mn) of 3 or less, and the density is 0.8
A resin having a MFR of 70 g / cm ³ or more and an MFR of 1.0 to ⁵ g / 10 minutes is melt-reactively extruded with a radical generator, and an antioxidant is added to the resin after the reaction and melt-extruded to obtain (MFRa) before the reaction. And the (MFRb) ratio after reaction is 1 <MF
A polyolefin-based resin composition that is modified so that Ra / MFRb ≦ 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has excellent whitening resistance,
The present invention relates to a polyolefin resin composition having excellent processability that can be used for calendar molding, and a film / sheet obtained therefrom.

[0002]

2. Description of the Related Art Calendering, which is excellent in thickness accuracy and enables high-speed production, is excellent in workability and product properties, and polyvinyl chloride (PVC) is often used. However, since PVC produces hydrogen chloride during combustion,
From the viewpoint of environmental problems, alternative materials are desired.

For this reason, various kinds of polyolefin resins have been conventionally used for calender molding, but it is known that they are extremely difficult to process because they stick to calender rolls during molding. Further, it is considered that the adhesion to the roll is caused by the low molecular weight component contained in the resin. In order to solve this problem, JP-A-7-260
As disclosed in Japanese Patent Publication No. 77, a method has been proposed in which a metal soap is added to an olefin resin to prevent sticking to a roll. However, the addition of these metallic soaps to the resin not only causes roll contamination at all but also is not hygienic.

On the other hand, a low crystalline ethylene random copolymer having a narrow molecular weight distribution obtained by using a metallocene catalyst as disclosed in Japanese Patent Publication No. 6-820 is used as a compounding agent for thermoplastic resins. It is suggested to do so. However, although an ethylene random copolymer having a narrow molecular weight distribution does not adhere to the roll, it has a low tension at the time of melting, cannot take the molten resin from the calender roll, and is difficult to calender.

Further, in JP-A-7-145249,
It has been proposed to add a styrene-ethylene / butadiene-styrene resin to a low density polyethylene resin to improve the releasability from the calender roll surface during calendering. However, the styrene-ethylene / butadiene-styrene resin added for improving the processability has a problem in weather resistance, and the effect of improving the processability was not sufficient. On the other hand, in Japanese Patent Laid-Open No. 7-12646,
A method of adding a hydrogenated styrene resin and polybutene to a polypropylene resin has been proposed. The resin composition obtained by this method can be calendered, but the resin cost is high, and the obtained film is whitened at the time of bending, so that its use in fields requiring design is restricted. This is the current situation.

[0006]

SUMMARY OF THE INVENTION The present invention solves such a problem, that is, bending without adding a large amount of an additive such as metal soap and / or an expensive styrene resin in order to prevent adhesion. It is an object of the present invention to provide a polyolefin resin composition that can be calendered without whitening during processing, and a film / sheet comprising the same.

[0007]

Means for Solving the Problems As a result of earnest studies, the present inventors have found that a gel which does not produce polyethylene having a specific molecular weight distribution and branching degree distribution polymerized using polypropylene and a metallocene catalyst. Reacted with a radical generator in the range, then, melt-extruded by adding an antioxidant, it was found that the above problems can be solved by calendering a polyolefin resin composition containing pelletized polyethylene, the present invention Arrived

That is, the present invention uses 100 parts by weight of polypropylene having a melt flow rate of 1 to 10 g / min measured under a load of 2160 g at 230 ° C. according to JIS K7210 condition 14, and ethylene using a metallocene catalyst. And a molecular weight distribution (Mw / Mn) determined by GPC of ³ or less, which is obtained by copolymerizing α-olefin having 3 or more carbon atoms with a density of 0.870 g / cm ³ or more,
JIS K7210 Condition 4 190 ° C, 2160g
Melt flow rate measured under a load of 1.0 to 5
After reacting a linear ethylene / α-olefin copolymer of g / 10 minutes with a radical generator, an antioxidant is added and melt-extruded to obtain a linear ethylene / α-olefin copolymer before reaction. The ratio of the melt flow rate (MFRa) of the polymer to the melt flow rate (MFRb) after the reaction is 1 <
The present invention relates to a resin composition comprising 10 to 800 parts by weight of polyethylene modified so that MFRa / MFRb ≦ 3, and particularly a film / sheet obtained by calendering it.

Hereinafter, the present invention will be described in detail.

The polypropylene used in the present invention is arbitrarily selected depending on the intended use, but a propylene-ethylene random copolymer (hereinafter abbreviated as random PP) is preferably used from the viewpoint of whitening. But JIS K
7210, condition 14, melt flow rate measured at 230 ° C. under a load of 2160 g is 1 to 10 g / 10.
Is what is the minute. Melt flow rate is 1g / 10
If it is less than 10 minutes, the surface condition of the obtained film or sheet will be poor, and if the melt flow rate exceeds 10 g / 10 minutes, the processability will be deteriorated and the physical properties will be unfavorable.

The linear ethylene / α-olefin copolymer used in the present invention is a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, which is polymerized by using a metallocene catalyst. There is a density of 0.870 g / cm ³
As described above, the weight average molecular weight (Mw) determined by GPC
And the number average molecular weight (Mn) ratio (Mw / Mn) is 3 or less, according to JIS K7210 Condition 4, 190 ° C, 2
Melt flow rate (M
FR) is 1.0 to 5 g / 10 minutes.

When the density is less than 0.870 g / cm ³ , the linear ethylene / α-olefin copolymer has a melting point of 60 ° C. or less, and it has adhesiveness at room temperature, which is not only inferior in handleability. However, the heat resistance of the product is insufficient, which is not preferable.

If (Mw / Mn) is larger than 3,
Since the low molecular weight component increases, it is not preferable because it easily sticks.

When the melt flow rate is less than 1.0 g / 10 minutes, the surface condition of the obtained film or sheet is poor, and when the melt flow rate exceeds 5 g / 10 minutes, the processability is deteriorated and the physical properties are deteriorated. The top is also unfavorable.

Such a linear ethylene / α-olefin copolymer can be produced, for example, by the method disclosed in the following publications.

JP-A-60-35006, JP-A-6-36
No. 0-35007, JP-A-60-35008, JP-A-3-163088, and JP-A-61-29.
6008, JP 63-22804, JP 58-19309, JP 63-61010, JP 63-152608, JP 63-
No. 264606, No. 63-280703, No. 64-6003, and No. 1-9511.
No. 0, JP-A-3-62806, JP-A 1-2
59004, JP 64-45406 A, JP 60-106808 A, JP 60-1379 A.
11, JP-A-61-296008, JP-A-63-501369, JP-A-61-221207.
JP, JP-A-2-22307, JP, 2-17
3110, JP-A-2-302410, JP-A-1-129003, JP-A-1-210404, JP-A-3-66710, JP-A-3-707.
No. 10, JP-A-1-207248, JP-A-6
3-222177, JP-A-63-222178, JP-A-63-222179, JP-A 1-1
No. 2407, No. 1-301704, No. 1-319489, No. 3-74412, No. 61-264010, No. 1-27.
5609, JP-A-63-251405, JP-A-64-74202, JP-A-2-41303, JP-A-2-131488, and JP-A-3-56.
508, JP-A-3-70708, and JP-A-3
-70709 publication etc. are mentioned.

The method for producing the linear ethylene / α-olefin copolymer which can be used in the present invention will be described below based on their contents. This linear ethylene / α
The olefin copolymer is, for example, an organic transition metal compound (I) containing a cyclopentadienyl derivative, and a compound (II) and / or an organic metal compound (III) which reacts with the organic transition metal compound (I) to form an ionic complex. It can be suitably produced by copolymerizing ethylene with an α-olefin having 3 or more carbon atoms in the presence of a catalyst consisting of

As the α-olefin having 3 or more carbon atoms,
Propylene, 1-butene, 4-methyl-1-pentene,
Examples thereof include 3-methyl-1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene and 1-dodecene.

As for the polymerization conditions of the solution polymerization method, the polymerization temperature is preferably 120 ° C. or higher in consideration of the fact that the copolymer is in a solution state and improving the productivity. Although the upper limit of the polymerization temperature is not particularly limited, it is preferably 300 ° C. or lower in order to suppress the chain transfer reaction that causes a decrease in the molecular weight and not decrease the catalyst efficiency. The pressure during the polymerization is not particularly limited, but is preferably at least atmospheric pressure in order to increase the productivity.

As the polymerization conditions for the high-pressure polymerization method, the polymerization temperature is preferably 120 ° C. or higher in consideration of the fact that the copolymer is in a solution state and improving the productivity. Although the upper limit of the polymerization temperature is not particularly limited, it is preferably 300 ° C. or lower in order to suppress the chain transfer reaction that causes a decrease in the molecular weight and not decrease the catalyst efficiency. The pressure during the polymerization is not particularly limited, but is preferably 500 kgf / cm ² or more so that a stable polymerization state can be obtained in the high pressure process.

In the gas phase polymerization method, the high temperature is not preferable because the copolymer is in a powder state, and it is necessary that the temperature is 100 ° C. or lower. The lower limit of the polymerization temperature is not particularly limited, but is preferably 50 ° C. or higher in order to increase productivity.

In the present invention, a radical generator is added to the linear ethylene / α-olefin copolymer produced by the above method to decompose and react the radical generator.

The radical generator used in the present invention is
Organic peroxides such as hydroperoxides, dialkyl peroxides and peroxyesters are preferable, and among them, the decomposition temperature giving a half-life of 1 minute is 150.
Those exceeding ℃ are preferable from the viewpoint of handling.

Any method may be used as the reaction method, but the following methods are mentioned as specific examples.

1) After the completion of polymerization, at the time of pelletizing the above-mentioned copolymer, a radical generator is simultaneously fed to carry out a melt extrusion reaction.

2) A master batch containing a large amount of radical generator is prepared in advance, and the master batch and the above-mentioned copolymer pellets are blended, extruded and reacted.

An antioxidant is added to the linear ethylene / α-olefin copolymer obtained by such a method, and the mixture is further melt-kneaded.

As the method of melt kneading, any means may be adopted, but specific examples include the following methods.

1) Using a kneader such as an extruder, a Banbury mixer or a roll mill, an antioxidant is added to the above copolymer.

2) A master batch containing a large amount of antioxidant is prepared in advance, and the master batch and the above-mentioned copolymer pellets are melt-kneaded.

As the antioxidant to be used, a phenolic antioxidant and a phosphorus antioxidant are used. Examples of the phenol-based antioxidant include antioxidants such as monophenol-based, thiobisphenol-based, and trisphenol-based antioxidants. More specifically, 2,4-bis (n-octylthio) -6- (4 -Hydroxy-3,
5-di-t-butylanilino) -1,3,5-triazine (for example, commercially available from Nippon Ciba Geigy Co., Ltd. under the trade name Irganox 565), octadecyl-3- (3,5-di-t- Butyl-4-hydroxyphenyl) propionate (for example, commercially available from Nippon Ciba Geigy Co., Ltd. under the trade name Irganox 1076), 1,3,5-trimethyl-2,4,6-tris (3,5-di) -T-butyl-4-hydroxybenzyl) -isocyanurate (commercially available from Nippon Ciba Geigy Co., Ltd. under the trade name Irganox 3114) and the like, and these are used alone or as a mixture of two or more kinds. . Specific examples of phosphorus antioxidants include tris (2,4-di-t-butylphenyl) phosphite (commercially available from Nippon Ciba-Geigy Co., Ltd. under the trade name Irgafos 168) and tetrakis. (2,4-di-t-butylphenyl) -4,4′-biphenylene phosphonite (for example, trade name Irgafos from Nippon Ciba Geigy Ltd.)
Commercially available as P-EPQFF), tris (nonylphenyl) phosphite (for example, Asahi Denka Co., Ltd.)
Marketed under the trade name MARK 1178)
And the like, and they are used alone or as a mixture of two or more kinds. Further, the phenolic antioxidant and the phosphorus antioxidant may be used in combination.

The ratio of the melt flow rate (MFRa) of the linear ethylene / α-olefin copolymer before the reaction to the melt flow rate (MFRb) after the reaction is 1 <MFRa.
The range of / MFRb ≦ 3 is preferable, and if this ratio exceeds 3, the molten state of the resin, so-called bank rotation, deteriorates, which is not preferable.

Other optional components may be added to the resin composition of the present invention within a range that does not significantly impair the effects of the present invention. Other optional components include ethylene / propylene copolymer rubber, ethylene / propylene / diene copolymer rubber, ethylene / butene copolymer rubber and other ethylene copolymer rubber, styrene / butadiene rubber, styrene / butadiene block. Copolymers or hydrogenated products thereof, polyolefin resins such as polyethylene, talc, calcium carbonate, clay, mica, fillers such as barium sulfate and magnesium hydroxide, various pigments, flame retardants and the like can be added.

The calender molding resin composition thus obtained can be molded by an ordinary calender molding machine, and the obtained sheet and film are lighter in weight than PVC, and hydrogen chloride gas during combustion is used. Since it does not occur and does not whiten during bending, it can be used for flooring materials, wallpaper, waterproof sheets, skin materials for various decorative plywood, masking films, etc.

[0035]

EXAMPLES The present invention will be described below with reference to examples, but is not limited to these examples.

The density of the linear ethylene / α-olefin copolymer is 10 in accordance with JIS K6760.
A sample that had been immersed in hot water at 0 ° C. for 1 hour and then allowed to cool to room temperature was measured using a density gradient tube kept at 23 ° C.

Further, using a differential scanning calorimeter, the sample was melted in the apparatus at 200 ° C. for 5 minutes and then cooled to 30 ° C. at a cooling rate of 10 ° C./minute.
The temperature at the position of the maximum peak of the endothermic curve obtained when the temperature was raised at a heating rate of / min was taken as the melting point.

Further, (Mw / Mn) is 150C ALC / GPC manufactured by Waters Co. (column: manufactured by Tosoh Corporation).
GMHHR-H (S), solvent: 1,2,4-trichlorobenzene) by the GPC method using Mw and M
n was measured and (Mw / Mn) was calculated. The column elution volume was calibrated by the universal calibration method using standard polystyrene manufactured by Tosoh Corporation.

Example 1 Polymerized with a metallocene-type catalyst and having a density of 0.90
0 g / cm ³ , MFR 2 g / 10 min, molecular weight distribution by GPC (Mw / Mn) = 1.8, melting point = 95 ° C. Ethylene / 1-hexene copolymer pellets, perbutyl-P as a radical generator 25 ppm of (decomposition temperature of 176 ° C. that gives a one-minute half-life) was added, and the mixture was melt-kneaded at 240 ° C. and pelletized.

2000 ppm of Irganox 1076 and 50 parts of PEP-Q as antioxidants were added to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The roll temperature of the calender is 150 to 18
Although it was set to 0 ° C, it was possible to continuously produce sheets. The roll releasability during processing, the surface condition, and the retrievability were evaluated. The results are shown in Table 1.

The obtained sheet had a good surface texture and no generation of gel or the like was observed. No whitening was observed in the 180-degree bending test at each temperature of 25 ° C and 5 ° C.

Example 2 Polymerized with a metallocene-type catalyst and having a density of 0.90
0 g / cm ³ , MFR 2 g / 10 min, molecular weight distribution by GPC (Mw / Mn) = 1.8, melting point = 95 ° C. Ethylene / 1-hexene copolymer pellets, perbutyl-P as a radical generator 50 ppm of (decomposition temperature of 176 ° C. that gives a one-minute half-life) was added, and the mixture was melt-kneaded at 240 ° C. and pelletized.

2000 ppm of Irganox 1076 and 50 parts of PEP-Q were added as antioxidants to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The workability was evaluated in the same manner as in Example 1.

The obtained sheet had a good surface texture and no generation of gel or the like was observed. In addition, Example 1
No whitening was observed in the same bending test as in.

Comparative Example 1 Polymerized using a metallocene type catalyst, having a density of 0.90.
0 g / cm ³ , MFR 2 g / 10 min, molecular weight distribution by GPC (Mw / Mn) = 1.8, melting point = 95 ° C. Ethylene / 1-hexene copolymer pellets, perbutyl-P as a radical generator 150 ppm of (decomposition temperature of 176 ° C. which gives a half-life of 1 minute) was added, and the mixture was melt-kneaded at 240 ° C. and pelletized.

Irganox 1076 as an antioxidant and 2000 ppm of PEP-Q were added to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The workability was evaluated in the same manner as in Example 1.

The obtained sheet had a poor surface condition and could not be used.

Comparative Example 2 Polymerized using a metallocene type catalyst, having a density of 0.90.
0 g / cm ³ , MFR 15 g / 10 min, molecular weight distribution by GPC (Mw / Mn) = 1.8, melting point = 95 ° C. Ethylene / 1-hexene copolymer pellets were added to the radical generator as perbutyl-P. 50 ppm of (decomposition temperature of 176 ° C. that gives a one-minute half-life) was added, and the mixture was melt-kneaded at 240 ° C. and pelletized.

2000 ppm of Irganox 1076 and 50 parts of PEP-Q as antioxidants were added to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21A, MFR = 2.0, 100 parts by weight of random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then an attempt was made to form an inverted L-shaped 6-calender, but the take-back property was poor and Was difficult.

Comparative Example 3 Polymerized using a metallocene type catalyst, having a density of 0.90.
The physical properties of the ethylene / 1-hexene copolymer pellets having 0 g / cm ³ , MFR of 1 g / 10 min, GPC molecular weight distribution (Mw / Mn) = 1.8, and melting point = 95 ° C. are shown in Table 1.
It was shown to.

2000 ppm of Irganox 1076 and 50 parts of PEP-Q were added as antioxidants to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The workability was evaluated in the same manner as in Example 1.

The obtained sheet had a good surface texture and no generation of gel or the like was observed, but the take-off property was poor and processing was difficult.

Comparative Example 4 Polymerized using a Ziegler type catalyst, having a density of 0.90.
Radical generation was carried out in the same manner as in Example 1 on an ethylene / 1-hexene copolymer pellet having 0 g / cm ³ , MFR of 2 g / 10 minutes, GPC molecular weight distribution (Mw / Mn) = 5, and melting point = 110 ° C. The agent was made to react.

Irganox 1076 as an antioxidant and 2000 ppm of PEP-Q were added to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The workability was evaluated in the same manner as in Example 1.

As a result, gel frequently occurred in the sheet, the surface texture was poor, and the take-up property was also poor.

Comparative Example 5 Polymerized using a Ziegler type catalyst and having a density of 0.90.
Radical generation in the same manner as in Example 2 on ethylene / 1-hexene copolymer pellets having 0 g / cm ³ , MFR of 2 g / 10 min, GPC molecular weight distribution (Mw / Mn) = 5, and melting point = 110 ° C. The agent was made to react.

2000 ppm of Irganox 1076 and 50 parts of PEP-Q were added as antioxidants to the pellets.
0 ppm was added, and the mixture was melt-kneaded at 240 ° C. and pelletized. Table 1 shows the physical properties of the pellets.

Polypropylene (Tosoh Polypro E60
21 A, 100 parts by weight of MFR = 2.0, random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer, and then molded with an inverted L-type 6-calender to prepare a 100 μ sheet.

The workability was evaluated in the same manner as in Example 1.

As a result, gel was frequently generated in the sheet, the surface texture was poor, and the take-up property was also poor.

Comparative Example 6 Polymerized using a metallocene type catalyst, having a density of 0.90.
0 g / cm ³ , MFR 2 g / 10 minutes, molecular weight distribution by GPC (Mw / Mn) = 1.8, melting point = 110 ° C. Ethylene / 1-hexene copolymer pellets, perbutyl-P as a radical generator 50 ppm of (decomposition temperature of 176 ° C. that gives a one-minute half-life) was added, and the mixture was melt-kneaded at 240 ° C. and pelletized.

Polypropylene (Tosoh Polypro E60
21A, MFR = 2.0, 100 parts by weight of random PP) and 400 parts by weight of the above copolymer were kneaded with a Banbury mixer and then molded with an inverted L-type 6-calender. It was possible.

[0074]

[Table 1]

[0075]

As described above, according to the present invention, it is possible to carry out calendering, which has been difficult with conventional polyolefins, and it is possible to produce a film or sheet which is free from whitening during bending.

Continuation of front page (51) Int.Cl. ⁶ Identification number In-house reference number FI Technical display location B29L 7:00 (72) Inventor Takeshi Watanabe 7-605 Itaya, Tsuchiura-shi, Ibaraki (72) Inventor Hiroshi Konishi Saitama 3-12-6 Gakuendai, Miyashiro-cho, Minami-Saitama-gun, Japan (72) Inventor Shuichi Morisui 4-173 Yoshishiki-cho, Omiya-shi, Saitama Prefecture

Claims (3)

[Claims] 1. A polyolefin resin composition comprising 100 parts by weight of polypropylene and 10 to 800 parts by weight of polyethylene, wherein the polypropylene has a melt flow rate (MFR) of 1 to 10 g / 10 minutes and polyethylene is ethylene. (A) Weight average molecular weight (Mw) and number average molecular weight (Mn) obtained by GPC (gel permeation chromatography) obtained by copolymerizing an α-olefin having 3 or more carbon atoms using a metallocene catalyst. The ratio (Mw / Mn) is 3 or less, (b) the density is 0.870 g / cm ³ or more, and (c) the melt flow rate measured at 190 ° C. and a load of 2160 g is 1.0 to 5 g /. A 10-minute linear ethylene / α-olefin copolymer is melt-reactively extruded with a radical generator, and the resin after the reaction is protected against oxidation. A melt flow rate of the linear ethylene / α-olefin copolymer before the reaction (MFRa) and a melt flow rate of the linear ethylene / α-olefin copolymer after the reaction (MFRb) ) Ratio is 1 <MFRa / MFRb
A polyolefin-based resin composition, which is modified so that ≦ 3. 2. A film sheet comprising the polyolefin resin composition according to claim 1. 3. A film sheet obtained by calendering the polyolefin resin composition according to claim 1.