JPH11349741A - Polyolefin-based resin composition and oriented film therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin-based resin composition capable of providing a polyolefin film excellent in transparency, slipperiness, blocking-resistance, scratch-resistance and fall-off resistance, and to provide a film using the same. SOLUTION: This oriented polyolefin film is obtained by at least uniaxially orienting a polyolefin-based resin composition which comprises 0.05 to 1.0 pts.wt. of saponification-treated product of the fine particles of a crosslinked polymer having an ester group in the polymer chain or of the hydrolysis-treated product thereof and 0.01 to 5 pts.wt. of acid-modified polyolefin-based resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to transparency, slipperiness,
The present invention relates to a polyolefin-based resin composition suitable for producing a stretched polyolefin film having excellent blocking resistance, scratch resistance, and shedding resistance, and a stretched polyolefin film using the same.

[0002]

2. Description of the Related Art Stretched polyolefin films, especially stretched polypropylene films, have been used in a wide range of applications such as food packaging and textile packaging because of their excellent transparency and mechanical properties. However, the stretched polypropylene film itself has a drawback of poor blocking resistance.
In order to solve such problems, many studies have been made so far, and a method of adding inorganic fine particles (Japanese Patent Publication No. 52-16134) and a method of adding organic fine particles (Japanese Patent Publication No. 50-134). No. 36262) has been proposed.

[0003] When inorganic fine particles are used as an anti-blocking agent, voids are generated at the time of film stretching due to insufficient affinity between the inorganic fine particles and the polyolefin resin, resulting in poor transparency. . In addition, there is a problem that the surface is damaged due to friction between the films due to the projection shape and hardness of the film surface, that is, the so-called scratch resistance becomes poor. Also, in the method of adding organic fine particles, a method using cross-linked polymethyl methacrylate particles or the like as the organic fine particles (Japanese Patent Laid-Open No. 5-2 / 1993)
No. 14120), but voids are generated during film stretching due to insufficient affinity with the polyolefin-based resin, resulting in poor transparency, and the anti-blocking agent falling off during film formation or secondary processing. It has drawbacks, such as inconvenience. If the anti-blocking agent falls off during the secondary processing, problems such as deterioration of film quality such as missing prints and scratches occur.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyolefin-based resin composition which gives a stretched polyolefin film having excellent transparency, slipperiness, blocking resistance, scratch resistance, and shedding resistance, and the use of the same. To provide a stretched film.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have used a crosslinked polymer fine particle treated product obtained by a specific treatment as an anti-blocking agent, and furthermore an acid-modified polyolefin. The present inventors have found that a polyolefin-based resin composition and a stretched film thereof that solve the above problems can be obtained by using the same as a compatibilizer, and have reached the present invention. That is, the present invention is obtained by treating a crosslinked polymer fine particle containing an ester group in the polymer chain with 100 parts by weight of a polyolefin resin with a base (so-called saponified product) or further treated with an acid. And a polyolefin-based resin composition comprising 0.05 to 1.0 parts by weight of a treated (so-called hydrolyzate) crosslinked polymer fine particle and 0.01 to 5 parts by weight of an acid-modified polyolefin-based resin. It is a stretched polyolefin film obtained by stretching at least in a uniaxial direction.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. 1. Polyolefin Resin The polyolefin resin used in the present invention is, for example, propylene, ethylene, butene-1, hexene-1,
A homopolymer or a copolymer such as -methylpentene-1 or a mixture of these polymers, and among them, it is preferable to use a polypropylene resin. The polypropylene-based resin used in the present invention is a known propylene-based polymer, such as a propylene homopolymer, a copolymer of propylene and another α-olefin, such as propylene -Ethylene copolymer, propylene-butene-1 copolymer, propylene-ethylene-
Butene-1 copolymers and mixtures thereof can be mentioned. If necessary, these polymers may be polyethylene, polybutene-1, styrene resin, ethylene-
It is also possible to add propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, and the like.

[0007] 2. Crosslinked polymer fine particles The crosslinked polymer fine particles containing an ester group in the molecule used in the present invention are polymers containing one or more radically polymerizable monomers containing an ester group, and a monomer copolymerizable with the monomer and a crosslinkable monomer. It is a copolymer with a monomer.

The radically polymerizable monomer containing an ester group may have an ester group in the molecule, for example, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, dodecyl acrylate, Stearyl acrylate, 2-ethylhexyl acrylate, tetrahydrofurfuryl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, methacrylic acid (Meth) acrylic monomers such as stearyl and 2-ethylhexyl methacrylate; and methyl 5-hexenoate. It is also possible to use these monomers in combination.

Examples of the monomer copolymerizable with the above-mentioned radical polymerizable monomer containing an ester group include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene and p-methylstyrene.
Styrene-based monomers such as -methylstyrene, α-methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, acrylic acid and methacrylic acid Examples include acid, ethylene, propylene, butylene, vinyl chloride, vinyl acetate, acrylonitrile, acrylamide, N-vinylpyrrolidone, and the like. It is also possible to use these monomers in combination.

Examples of the crosslinking monomer include trimethylolpropane triacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, decaethylene glycol dimethacrylate, and pentadecaethylene glycol dimethacrylate. (Meth) acrylic monomers such as 1,3-butylene dimethacrylate, allyl methacrylate, trimethylolpropane trimethacrylate, pentaerythritol tetramethacrylate, diethylene glycol dimethacrylate phthalate, divinyl benzene,
Examples include aromatic divinyl compounds such as divinylnaphthalene and derivatives thereof, crosslinking agents such as N, N-divinylaniline, divinylether, divinylsulfide, and divinylsulfonic acid, and polybutadiene and polyisoprene unsaturated polyester.

Examples of the method of copolymerizing a monomer capable of copolymerizing with the radical polymerizable monomer having an ester group and a crosslinking monomer include an emulsion polymerization method, a dispersion polymerization method, a suspension polymerization method and a soap-free polymerization method. , Seed polymerization method,
A swelling polymerization method, a microsuspension polymerization method, and the like can be given.

The average particle size of the crosslinked polymer fine particles used in the present invention is 0.3 to 10 μm, preferably 0.7 to 3 μm, in terms of volume average particle size. If the average particle size is less than 0.3 μm, sufficient blocking resistance cannot be imparted when formed into a film, and if the average particle size exceeds 10 μm, a large stress will be applied to the interface between the crosslinked polymer fine particles and the polyolefin during film stretching. When concentration occurs, interfacial peeling occurs and voids occur, resulting in deterioration in transparency and resistance to falling off.

3. Treatment of Crosslinked Polymer Fine Particles In the present invention, the above crosslinked polymer fine particles are used after being treated (saponified) with a base, or subsequently treated (hydrolyzed) with an acid. As the base used for the treatment,
For example, an aqueous solution of lithium hydroxide, sodium hydroxide, potassium hydroxide, potassium carbonate or the like, an ethanol solution and the like can be exemplified. However, the present invention is not limited thereto, and it is of course possible to use other saponification methods. When an aqueous solution of lithium hydroxide, sodium hydroxide, potassium hydroxide, potassium carbonate, or the like, an ethanol solution, or the like is used as the base, the crosslinked polymer particles may be brought into contact with the base solution at room temperature. In the case of a methacrylate-based compound, heating and stirring are more effective because of strong base resistance. The progress of the saponification reaction can be confirmed by infrared absorption spectrum measurement (IR). Saponification reaction proceeds, COO near 1570 cm ^{-1 -} it occurs absorption due to. Examples of the acid used for the treatment include, but are not limited to, sulfuric acid, hydrochloric acid, acetic acid, formic acid, and nitric acid. The acid treatment (hydrolysis) of the saponified product proceeds easily, and the saponified product of the crosslinked polymer particles only needs to be brought into contact with the above-mentioned acid or a diluent thereof at room temperature. (Approximately 1570 cm ^-1 ) disappearance.

4. Acid-Modified Polyolefin Resin As the acid-modified polyolefin resin used in the present invention, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, citraconic acid, hymic acid, or anhydrides thereof are known. , For example, an acid-modified polyolefin resin obtained by graft-polymerizing a polyolefin resin by a melt grafting method or a solution grafting method. These unsaturated carboxylic acids or anhydrides can be used alone or in combination of two or more. As the polyolefin, the same polyolefin as the polyolefin resin used in the present invention can be used. For example, propylene, ethylene,
Homopolymers or copolymers of butene-1, hexene-1, 4-methylpentene-1 and the like or a mixture of these polymers are exemplified, and among them, low molecular weight polypropylene is preferably used. The acid-modified polyolefin resin used in the present invention is JIS K0070
Is from 1.0 to 100 mgKOH / g, preferably from 5 to 60 mgKOH / g. When the acid value is less than 1.0 mgKOH / g, the transparency and the falling resistance deteriorate. On the other hand, if it exceeds 100 mgKOH / g, operability deteriorates. Such an acid-modified polyolefin resin can be appropriately selected from commercially available resins, and for example, a commercially available maleic anhydride-modified polypropylene such as a Umex series (manufactured by Sanyo Chemical Industries, Ltd.) can be used. it can.

[0015] 5. Polyolefin-based resin composition The polyolefin-based resin composition of the present invention is a composition comprising the polyolefin-based resin, the crosslinked polymer fine particle treated product, and the acid-modified polyolefin-based resin, and is cross-linked to 100 parts by weight of the polyolefin-based resin. 0.05 to 1 part by weight, preferably 0.07 part by weight of the treated polymer fine particles
0.5 parts by weight, acid-modified polyolefin resin
1 to 5 parts by weight, preferably 0.02 to 2 parts by weight is blended. If the treated crosslinked polymer fine particles are less than 0.05 part by weight, sufficient slipperiness and blocking resistance cannot be obtained, while if it exceeds 1 part by weight, transparency deteriorates. If the amount of the acid-modified polyolefin resin is less than 0.01 part by weight, the transparency and the resistance to falling off are not sufficiently improved, and if it exceeds 5 parts by weight, the operability during film formation deteriorates. From the polyolefin-based resin composition of the present invention, it is possible to obtain a stretched film having an excellent balance between transparency and anti-blocking properties and also having excellent resistance to falling off of polymer particles.

As a method for adding the crosslinked polymer fine particle treated material and the acid-modified polyolefin resin to the polyolefin resin, any method may be used as long as the crosslinked polymer fine particle treated material and the acid modified polyolefin resin are uniformly dispersed. Good, for example, polyolefin resin,
After mixing the crosslinked polymer fine particle treated product and the acid-modified polyolefin-based resin by a ribbon blender, a Henschel mixer, or the like, a method in which the mixture is melt-kneaded by an extruder may be used. In this case, additives such as an antioxidant, an antistatic agent, a neutralizing agent, and a lubricant can be appropriately compounded.

The polyolefin resin composition of the present invention may have a final composition in a stretched film within the above-mentioned composition range. For example, a high-concentration masterbatch is prepared in advance.
It is possible to dilute to a predetermined concentration by using a method such as dry blending during the production of a stretched film.

6. Film The stretched film of the present invention is produced by melt-extruding the polyolefin-based resin composition obtained above, cooling it, and then stretching it in at least one axis direction by a known method. The thickness of the film of the present invention is not particularly limited.
It is not more than 00 μm, preferably 5 to 100 μm, more preferably 10 to 50 μm. Furthermore, the stretched film according to the present invention may be a multilayer film or a laminated film having two or more layers, and it is more preferable to use the resin composition of the present invention for at least one surface layer. In this case, the composition of the resin constituting the surface layer of the multilayer film may be within the composition range of the resin composition. Examples of a method for obtaining a laminated film include a multilayer coextrusion method and a dry lamination method.

[0019]

EXAMPLES The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not particularly limited by the following Examples. In addition, the measured value of each item in the detailed description of the present invention and the examples was measured by the following method. (1) Haze (unit%): Measured according to JIS K7105 and used as a measure of transparency. (2) Blocking property (unit: g / 10 cm ² ): The corona-treated surfaces of the two films are overlapped so that the contact area becomes 40 cm ² , placed between two glass plates, and placed at 2 kg.
And then left for 24 hours in an atmosphere of 50 ° C. and 50% humidity, and then, using a tensile tester, a tensile speed of 150 mm /
The film was peeled off every minute, and the maximum load was read and evaluated. (3) Slipperiness: The static friction coefficient (μs) and the dynamic friction coefficient (μd) were measured according to ASTM D-1894. (4) Scratch resistance: A 100 × 300 mm film (film A) was fixed on a glass plate without sagging and without wrinkling. Further, a 100 × 300 mm film (film B) was placed on the film A, and a 200 g weight was placed on the center of the film B so as to be in contact with the area of 5 × 5 cm. Next, the film B was rubbed 100 times between 10 cm by moving horizontally. The haze before and after the rubbing of the film A was measured, and the difference Δ
Haze was a measure of the scratch resistance of the film. The smaller the value, the better. (5) Drop-off resistance: A 100 × 300 mm film was sagged on a glass plate and fixed without wrinkling. Also, 10
0 × 50 mm black paper is wrapped with gauze in triple 10
It was wrapped around a rod having a contact area of 0 × 10 mm and fixed. Both were rubbed for 10 minutes under the conditions of an amplitude of 200 mm and a shaking speed of 72 times / min. The adhesion of the antiblocking agent to the black paper was visually evaluated according to the following criteria. ：: Almost no adhesion was observed. X: Adhesion is observed.

Example 1 (1) Preparation of a crosslinked polymer fine particle-treated product In a glass flask equipped with a stirrer, 500 g of a crosslinked polymethyl methacrylate fine particle (volume average particle size: 1.9 μm, Art Pearl F4P manufactured by Negami Kogyo Co., Ltd.), 20 g A 1% aqueous solution of potassium hydroxide was charged, and reacted for 48 hours under boiling conditions with stirring. After cooling to room temperature, the contents of the flask were filtered, the filtration residue was washed with water, and dried under reduced pressure to obtain a crosslinked polymer fine particle treated product. Crosslinked polymer fine particles treated product, COO ^- due to absorption (1570 cm
^-1 ) was confirmed by IR, thereby confirming the progress of the reaction. (2) Preparation of biaxially stretched film 85% by weight of polypropylene powder having a melt flow rate of 2.3 g / 10 minutes, 10% by weight of crosslinked polymer fine particles treated in (1), and an acid-modified polyolefin-based resin, Sanyo Chemical Industry Co., Ltd. UMEX 1001 (acid value: 26m)
gKOH / g) 0.1 part by weight of calcium stearate, 100 parts by weight of a resin composition comprising 5% by weight, B
0.2 parts by weight of HT (2,6-di-tert-butylhydroxytoluene) and Irgan manufactured by Ciba-Geigy
After adding 0.05 parts by weight of ox1010 and mixing with a Henschel mixer, the mixture was granulated with a 45 mm twin-screw extruder and pelletized. 100 parts by weight of the obtained pellets and polypropylene powder having a melt flow rate of 2.3 g / 10 min, 0.1 part by weight of calcium stearate, BHT
(2,6-di-tert-butylhydroxytoluene)
0.2 parts by weight, Irganox 101 manufactured by Ciba Geigy
0 0.05 parts by weight and 1.1 parts by weight of a polyoxyethylene alkylamine fatty acid ester as an antistatic agent are mixed with a Henschel mixer, and then granulated with a 65 mm extruder. The crosslinked polymer fine particles were mixed at a concentration of 0.2 parts by weight with respect to 100 parts by weight of polypropylene, and the pellet mixture was melt-extruded from a T-die and quenched with a chill roll to obtain a film. 5 times at 140 ° C in the longitudinal direction and 15 times in the transverse direction using a biaxial stretching machine.
After stretching 9 times at 5 ° C. to obtain a stretched film having a thickness of 20 μm, one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films.

Example 2 A cross-linked polymer was prepared in the same manner as in Example 1 (1) except that the base used was changed to sodium hydroxide in the preparation of the treated crosslinked polymer fine particles of Example 1 (1). A treated polymer fine particle was obtained. Using this crosslinked polymer fine particle treated product, a stretched film having a thickness of 20 μm was obtained in the same manner as in Example 1 (2), and then one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films.

Example 3 Crosslinking was carried out in the same manner as in Example 1 (1) except that the base used in the preparation of the treated crosslinked polymer fine particles in Example 1 (1) was changed to lithium hydroxide. A treated polymer fine particle was obtained. Using this crosslinked polymer fine particle treated product, a stretched film having a thickness of 20 μm was obtained in the same manner as in Example 1 (2), and then one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films.

Comparative Example 1 Using untreated crosslinked polymethyl methacrylate fine particles (art pearl F4P manufactured by Negami Kogyo Co., Ltd.),
After obtaining a stretched film having a thickness of 20 μm in the same manner as in (2), one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films. The haze was worse than in Example 1. Also, the shedding resistance deteriorated.

Comparative Example 2 (1) Preparation of Treated Product of Crosslinked Polymer Fine Particles The procedure was the same as in Example 1 (1). (2) Preparation of Biaxially Stretched Film Stirring was carried out with respect to 100 parts by weight of a resin composition consisting of 90% by weight of a polypropylene powder having a melt flow rate of 2.3 g / 10 minutes and 10% by weight of a treated product of the crosslinked polymer fine particles of (1). 0.1 parts by weight of calcium phosphate, BHT
(2,6-di-tert-butylhydroxytoluene)
0.2 parts by weight and Irganox manufactured by Ciba Geigy
After adding 1010 0.05 part by weight and mixing with a Henschel mixer, the mixture was granulated with a 45 mm twin screw extruder and pelletized. 1. Obtained pellets and melt flow rate
100 parts by weight of 3 g / 10 min polypropylene powder,
0.1 parts by weight of calcium stearate, BHT (2,6
-Ditertiary butyl hydroxytoluene) 0.2 parts by weight, Irganox 10100 0.1% by Ciba-Geigy.
A crosslinked polymer was mixed with a polypropylene pellet obtained by mixing a polyoxyethylene alkylamine fatty acid ester as an antistatic agent in an amount of 1.1 part by weight with a Hensial mixer and granulating the mixture with a 65 mm extruder. The concentration of the fine particle treated product is polypropylene 10
The mixture was melt-extruded from a T-die, quenched by a chill roll to obtain a film, and the obtained film was vertically stretched by a tenter-type biaxial stretching machine to 140 parts by weight. 5 times at ℃, 9 at 155 ° C in the horizontal direction
After stretching twice to obtain a stretched film having a thickness of 20 μm,
One side was corona treated. Table 1 shows the evaluation results of the obtained films. Since the resin composition was out of the range of the present invention, the haze was worse than that of the examples, and the falling resistance was also worse.

Example 4 (1) Preparation of crosslinked polymer fine particle treated product Crosslinked polymethyl methacrylate fine particles (Art Pearl F4P, manufactured by Negami Kogyo Co., Ltd.) were placed in a glass flask equipped with a stirrer.
00 g and 1 liter of a 20% aqueous potassium hydroxide solution were charged and reacted under boiling conditions for 48 hours while stirring. After cooling to room temperature, the contents of the flask were filtered, the filtration residue was transferred to a beaker, 2N hydrochloric acid was added until it became acidic, the contents of the beaker were filtered, the filtration residue was washed with water, and dried under reduced pressure.
A treated product of crosslinked polymer fine particles was obtained. In the crosslinked polymer fine particle-treated product, absorption due to COO ⁻ was confirmed by IR at the stage of treatment with the base (1570 cm ⁻¹ ), and absorption due to COO ⁻ disappeared by subsequent treatment with an acid. The progress of the reaction was confirmed. (2) Preparation of biaxially stretched film 85% by weight of polypropylene powder having a melt flow rate of 2.3 g / 10 minutes, 10% by weight of crosslinked polymer fine particles treated in (1), and an acid-modified polyolefin-based resin, Sanyo Chemical Industry Co., Ltd. 0.1 part by weight of calcium stearate, 0.2 part by weight of BHT (2,6-di-tert-butylhydroxytoluene), and 100 parts by weight of a resin composition comprising 5% by weight of Umex 1005 manufactured by Umex 100, and Irganox 10100 manufactured by Ciba-Geigy .05 parts by weight and mixed with a Henschel mixer.
Granulated by a twin screw extruder and pelletized. The obtained pellets, 100 parts by weight of a polypropylene powder having a melt flow rate of 2.3 g / 10 min, 0.1 parts by weight of calcium stearate, 0.2 parts by weight of BHT (2,6-di-tert-butylhydroxytoluene), Ciba-Geigy 0.05 parts by weight of Irganox 1010 and 1.1 parts by weight of a polyoxyethylene alkylamine fatty acid ester as an antistatic agent are mixed with a Hensial mixer and then granulated with a 65 mm extruder, and the resulting mixture is mixed with a ribbon mixer using a ribbon mixer. The concentration of the processed crosslinked polymer fine particles is 0.2 with respect to 100 parts by weight of polypropylene.
Parts by weight, the pellet mixture was melt-extruded from a T-die, quenched with a chill roll to obtain a film, and the obtained film was heated at 140 ° C. in the longitudinal direction with a tenter-type biaxial stretching machine.
5 times at 155 ° C. and 9 times at 155 ° C.
After obtaining a μm stretched film, one surface was subjected to a corona treatment. Table 1 shows the evaluation results of the obtained films.

Example 5 In the preparation of the treated crosslinked polymer fine particles of Example 4 (1), the crosslinked polymethyl methacrylate fine particles were mixed with Nippon Shokubai Co., Ltd. Eposter MA1002 (volume average particle diameter:
The same treatment as in Example 4 (1) was carried out except that the composition was changed to 2.5 μm) to obtain a treated product of crosslinked polymer fine particles. Using the crosslinked polymer fine particle-treated product, a stretched film having a thickness of 20 μm was obtained in the same manner as in Example 4 (2), and then one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films.

Comparative Example 3 Except that untreated crosslinked polymethyl methacrylate fine particles (Eposter MA1002 manufactured by Nippon Shokubai Co., Ltd.) were used,
After a stretched film having a thickness of 20 μm was obtained in the same manner as in Example 1 (2), one surface was subjected to corona treatment. Table 1 shows the evaluation results of the obtained films. The haze was worse than in the example. Also, the shedding resistance deteriorated.

Comparative Example 4 (1) Preparation of Treated Product of Crosslinked Polymer Fine Particles The procedure was the same as in Example 1 (1). (2) Preparation of Biaxially Stretched Film Stirring was carried out with respect to 100 parts by weight of a resin composition consisting of 90% by weight of a polypropylene powder having a melt flow rate of 2.3 g / 10 minutes and 10% by weight of a treated product of the crosslinked polymer fine particles of (1). 0.1 parts by weight of calcium phosphate, BHT
(2,6-ditert-butylhydroxytoluene)
0.2 parts by weight and Irganox manufactured by Ciba Geigy
After adding 0.0510 parts by weight of 1010 and mixing with a Henshall mixer, the mixture was granulated with a 45 mm twin screw extruder and pelletized. 1. Obtained pellets and melt flow rate
100 parts by weight of 3 g / 10 min polypropylene powder,
0.1 parts by weight of calcium stearate, BHT (2,6
-Ditertiary butyl hydroxytoluene) 0.2 parts by weight, Irganox 10100 0.1% by Ciba-Geigy.
Crosslinked polymer microparticles obtained by mixing a polyoxyethylene alkylamine fatty acid ester as an antistatic agent and a polypropylene pellet obtained by mixing the mixture with a Henschel mixer and granulating the mixture with a 65 mm extruder using a ribbon mixer. The concentration of the processed material is polypropylene 10
The mixture was melt-extruded from a T-die, quenched by a chill roll to obtain a film, and the obtained film was vertically stretched by a tenter-type biaxial stretching machine to 140 parts by weight. 5 times at ℃, 9 at 155 ° C in the horizontal direction
After stretching twice to obtain a stretched film having a thickness of 20 μm,
One side was corona treated. Table 1 shows the evaluation results of the obtained films. Since the resin composition was out of the range of the present invention, the haze was worse and the falling-out resistance was worse than in the examples.

[0029]

[Table 1]

[0030]

The polyolefin resin composition of the present invention gives a stretched film having excellent transparency, slipperiness, scratch resistance, blocking resistance, and shedding resistance. Further, the stretched film according to the present invention is excellent in operability due to its excellent slipperiness, blocking resistance, and shedding resistance, and furthermore, due to its excellent transparency, it is suitable for a wide range of uses such as food packaging and fiber packaging. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 101: 00)

Claims (4)

[Claims] 1. A polyolefin-based resin composition comprising the following components (1), (2) and (3). (1) 100 parts by weight of polyolefin resin (2) Crosslinked polymer fine particles having an ester group in the polymer chain, which are saponified, or further hydrolyzed, crosslinked polymer fine particles having a volume average particle diameter of 0.3 to 10 μm 0.05 to 1.0 part by weight of the treated product (3) The acid value specified by JIS K0070 is 1.0 to 1.0
0.01 to 5 parts by weight of an acid-modified polyolefin resin of 100 2. The polyolefin resin composition according to claim 1, wherein the polyolefin resin is a polypropylene resin. 3. A stretched polyolefin film obtained by stretching the polyolefin-based resin composition according to claim 1 in at least one axial direction. 4. The stretched polyolefin film according to claim 3, wherein the polyolefin resin is a polypropylene resin.