JPH08269268A - Polyethylene resin composition and film using the same - Google Patents

Abstract

PURPOSE: To obtain a polyethylene resin compsn. which gives a film excellent in antistatic properties and unsealability, having a low slipperiness. and suitable for high-speed forming. CONSTITUTION: A resin component comprising 50-100wt.% ethylene-α-olefin copolymer having a density of 0.88-0.96g/cm<3> and 0-50wt.% (co)polymer produced pref. by a high-pressure free-radical polymn. is compounded with 100-2,000ppm antistatic agent and 100-1,500ppm alkylenebis-satd. higher fatty acid amide.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is a polyethylene-based resin which has excellent antistatic properties, excellent opening properties, and low slipperiness, and is suitable for the production of heavy packaging bags for fertilizers, chemicals, rice, films for sugar bags, etc. TECHNICAL FIELD The present invention relates to a resin composition and a film using the same.

[0002]

BACKGROUND OF THE INVENTION Linear low density polyethylene is used in large quantities in the fields of heavy packaging bags, rice, sugar bags and the like. recent years,
The automatic filling device has become faster, and the static electricity is generated due to the friction of the bag that is supplied at high speed, and the powder of the content adheres to the opening during filling and interferes with the heat sealing. Therefore, various antistatic agents have been used. However, if the antistatic agent is added in a certain amount or more, the surface bleeding phenomenon of the antistatic agent component causes tackiness, which causes a problem that the opening property of the film is deteriorated.
Therefore, in order to improve the opening property, a method of using a large amount of an anti-blocking agent such as silica is taken, but the surface condition of the film is roughened and the printability and transparency are deteriorated.
Also, it is possible to use a lubricant as another method to improve the opening property, but if a large amount of a lubricant such as fatty acid amide is added, the film will slip too much and the gripping problem or the content when feeding the bag to the automatic filling device will be There is a problem such as a problem such as collapse of load when the bags filled with the items are transported or stacked and stored.

In order to solve the above-mentioned problems, Japanese Patent Laid-Open No. Sho 61-61
JP-A-218649 discloses a technique of adding an alkylenebis higher fatty acid amide, and in the examples, addition of methylenebisstearic acid amide to an ethylene-vinyl acetate copolymer is illustrated, and charging as an optional component is performed. Although the compounding of the inhibitor is disclosed, there is no disclosure or suggestion of the role of the addition of the antistatic agent at the time of high-speed molding, prevention of blocking of the film (opening property), control of lubricity and the like.

Further, Japanese Patent Application Laid-Open No. 62-25138 discloses a technique in which an antiblocking agent and a fatty acid bisamide are used in combination. However, even in this publication, there is no disclosure about prevention of blocking caused by an antistatic agent blended for preventing static electricity at the time of high-speed molding and control of film slipperiness. If a known lubricant such as oleic acid amide is added to a general heavy-duty packaging film, the film is too slippery, which is a serious cause of collapse of the load during storage, which is not preferable.

Furthermore, the _{R-CO-NH- (CH 2} ) n-NH = CO-R (R in hindered phenolic antioxidant as a heat stable polyolefin resin composition in JP-A-1-282232 discloses a carbon It has been proposed to add an alkylenebis fatty acid amide compound having a structural formula of an alkyl group or an alkenyl group of several 5 to 21. However, this publication merely aims at thermal stability, and an antistatic agent. Is not described, and nothing is suggested about the effect on the lubricity of the film.

Further, in JP-A-5-59224, there is disclosed a mixed composition of a saturated amide and an unsaturated amide which can obtain good slip properties and anti-adhesion effect without using an inorganic filler which is an anti-adhesion agent. Although the production method is described, there is no disclosure or suggestion of antistatic performance and control of openability and lubricity during high-speed molding.

[0007]

DISCLOSURE OF THE INVENTION The present invention suppresses static electricity in the state where an antistatic agent bleeds on the surface, maintains good antistatic performance, has excellent opening property, and has an appropriate sliding property. It is an object of the present invention to provide a polyethylene resin composition suitable for producing a film having controlled properties and a film using the same.

[0008]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a resin component containing an ethylene / α-olefin copolymer having a density of 0.88 to 0.96 g / cm ³ as a main component. The inventors have found that a polyethylene resin composition and a film that solve the above problems can be obtained by adding a specific antistatic agent and a specific alkylene bis saturated higher fatty acid amide, and have completed the present invention.

The polyethylene resin composition of the present invention comprises (A) 50 to 100% by weight of an ethylene / α-olefin copolymer having a density of 0.88 to 0.96 g / cm ³ and other than (B) and (A). Resin, preferably ethylene (co) polymer by high-pressure radical polymerization method 0 to 50% by weight, based on the resin component (C) antistatic agent 100 to 2000 ppm and (D) alkylenebis saturated higher fatty acid amide 100 to 1500 ppm Is contained.

The present invention will be described in detail below. The ethylene / α-olefin copolymer (A) having a density of 0.88 to 0.96 g / cm ³ used in the present invention means ethylene and carbon obtained by a high, medium and low pressure method using a Ziegler catalyst or the like and other known methods. It is a copolymer with an α-olefin of several 3 to 12. Specific α-olefins include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-dodecene and the like. Among these, preferred are α-olefins having 6 or more carbon atoms such as 4-methyl-1-pentene, 1-hexene, 1-octene. Α- in ethylene copolymer
The olefin content is preferably 5 to 40 mol%.

The ethylene / α-olefin copolymer as the component (A) in the present invention has a density of 0.88 to 0.9.
6 g / cm ³ , preferably 0.90 to 0.94 g / cm
³ , more preferably in the range of 0.91 to 0.93 g / cm ³ , and have a melt flow rate (hereinafter referred to as MFR) of 0.1 to 20 g / 10 min. , Preferably 0.2 to 1
0 g / 10 min. , And more preferably 0.3 to 5 g / 1
0 min. Is what is.

The (B) ethylene (co) polymer used by the high pressure radical polymerization method used in the present invention means an ethylene homopolymer having a density of 0.91 to 0.94 g / cm ³ by the high pressure radical polymerization method, ethylene and vinyl. Examples thereof include copolymers with an ester α, β-unsaturated carboxylic acid or its derivative.

Density 0.9 by the above high pressure radical polymerization method
The ethylene homopolymer of 1 to 0.94 g / cm ³ is a low-density polyethylene prepared by a known high pressure radical method.

The above-mentioned ethylene-vinyl ester copolymer means vinyl propylene oxide, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate containing ethylene as a main component, which is produced by a high pressure radical polymerization method. , A copolymer of vinyl ester monomer such as trifluorovinyl acetate and optionally other unsaturated monomer. Among these copolymers, an ethylene-vinyl acetate copolymer can be mentioned as a preferable one. In particular, ethylene 65 to 99.5 wt%, vinyl acetate 0.5 to 35 wt% and other unsaturated monomers 0 to 25
Copolymers consisting of wt% are preferred.

The above-mentioned copolymer of ethylene-α, β-unsaturated carboxylic acid or its derivative means ethylene and α, β.
-Unsaturated carboxylic acids or derivatives thereof and copolymers with other unsaturated monomers, if desired, and metal salts, amides, imides thereof and the like. Specific examples of the α, β-unsaturated carboxylic acid that is a copolymerization component include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid. Specific examples of the derivative include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n methacrylate. -Butyl and the like can be mentioned. Among these copolymers, an ethylene-ethyl acrylate copolymer produced by a high-pressure radical polymerization method is preferable. In particular, ethylene 65 to 99.5% by weight, acrylic acid ethyl ester 0.
5 to 35% by weight and other unsaturated monomers 0 to 25% by weight
Copolymers consisting of are preferred.

The other unsaturated monomers mentioned above include propylene, 1-butene, 1-hexene and 4-methyl-1-.
3 to 1 carbon atoms such as pentene, 1-octene, 1-decene
Olefins _0, vinyl esters of C 2 -C ₃ alkane carboxylic acid, (meth) acrylate, (meth)
(Meth) acrylic acid esters such as ethyl acrylate, propyl (meth) acrylate, glycidyl (meth) acrylate, ethylenically unsaturated carboxylic acids such as (meth) acrylic acid, maleic acid, fumaric acid and maleic anhydride, or At least one selected from the group of its anhydrides
It is a seed.

The ethylene (co) polymer which is the component (B) in the present invention has a density of 0.91 to 0.94 g / c.
m ³ , preferably 0.915 to 0.935 g / cm ³ ,
More preferably 0.92-0.93 g / cm ³ , MFR
Is 0.1 to 20 g / 10 min. , Preferably 0.2-
10 g / 10 min 0, more preferably 0.2-5 g /
10 min. Is what is. In particular, low-density polyethylene produced by the high-pressure radical polymerization method is most preferable from the viewpoint of molding stability, economy and the like.

The mixing ratio of the component (A) and the component (B) is 50 to 100% by weight of the component (A) and 5 for the component (B).
It is in the range of 0% by weight or less. The component (B) can be blended up to 50% due to high-speed moldability, bubble stability during film molding, etc., but if the range of the component (B) exceeds 50% by weight, impact resistance and mechanical strength are poor. Considering the balance of the film, the component (B) is preferably selected from the range of 10 to 30% by weight.

The antistatic agent (C) used in the present invention is a nonionic surfactant, an amphoteric betaine type surfactant, an amine antistatic agent or a polyhydric alcohol which is generally used for polyolefins. An internal kneading-type antistatic agent such as the higher fatty acid ester antistatic agent described above is used. Specific examples of the nonionic surfactant include polyoxyethylene alkyl (or alkenyl) amine,
Higher fatty acid ester of polyoxyethylene alkyl (or alkenyl) amine, polyoxyethylene alkyl (or alkenyl) amide, higher fatty acid ester of polyoxyethylene alkyl (or alkenyl) amide, higher fatty acid ester of higher alcohol, higher alcohol of polyhydric alcohol A fatty acid ester etc. can be mentioned.

Specific examples of the amphoteric betaine-type surfactant include alkyl (or alkenyl) dihydrooxyethyl betaine and the like, either alone or in combination. Specific examples of the amine antistatic agent include palmityldiethanolamine, stearyldiethanolamine, palmityldiethanolamide, stearyldiethanolamide, and the like. Specific examples of the higher fatty acid ester antistatic agent of polyhydric alcohol include glycerin monopalmitate and glycerin monostearate. These antistatic agents are used alone or as a mixture of a plurality of them, but it is preferable to use a mixture of a plurality of them. Specific examples include a mixture of an amine antistatic agent and a higher fatty acid ester antistatic agent of a polyhydric alcohol.

The mixing ratio of the antistatic agent as the component (C) is 100 to 100 based on the total amount of the resin components (A) and (B).
2000 ppm, preferably 300-1500 ppm,
More preferably, it is 400-1300 ppm. (C)
If the compounding amount of the component exceeds 2000 ppm, a blocking phenomenon occurs and the opening property deteriorates, and if it is less than 100 ppm, the antistatic effect cannot be obtained.

The (D) alkylenebis saturated higher fatty acid amide used in the present invention is a compound represented by the following general formula.

[0023]

(Equation 1)

(However, R ₁ is an alkylene group having 1 to 20 carbon atoms, and R ₂ and R ₃ are alkyl groups having 5 to 21 carbon atoms.) Specific examples of such a compound include, for example, methylenebisstearin. Acid amide, ethylenebisstearic acid amide,
Methylenebispalmitic acid amide, ethylenebispalmitic acid amide, methylenebisbehenic acid amide, ethylenebisbehenic acid amide, hexamethylenebisstearic acid amide, hexaethylenebispalmitic acid amide, hexamethylenebisbehenic acid amide and the like can be mentioned. . Of these, ethylene bisstearic acid amide is most preferred.

The mixing ratio of the alkylenebis saturated higher fatty acid amide as the component (D) is 100 to 1500 ppm, preferably 3 with respect to the total of the resin components (A) and (B).
0 to 1200 ppm, more preferably 400 to 100
It is 0 ppm. Component (D) content is 1500 ppm
If it exceeds the range, heat sealability and printing characteristics will be hindered.
If it is less than 00 ppm, there is no effect of improving the opening property.

The alkylenebis higher fatty acid amide used in the present invention must be a compound using a saturated higher fatty acid. When the addition amount of the antistatic agent is increased, the antistatic effect is improved, and the lubricity and blocking are increased, so that the opening property is deteriorated. When the antistatic agent and the alkylenebis saturated higher fatty acid amide are used in combination, the lubricity of the antistatic agent can be suppressed and the opening property can be improved, so that it is not necessary to use a large amount of the anti-blocking agent, which has been widely used in conventional films. Therefore, it is possible to avoid adverse effects such as deterioration of transparency that occurs when a large amount of the anti-blocking agent is used, and it is effective for film applications such as rice and sugar bags. However, when an alkylenebis unsaturated higher fatty acid amide is used in place of the alkylenebis saturated higher fatty acid amide used in the present invention, the opening property is improved, but at the same time, the slipperiness is imparted and the high wrapping property is achieved. It is not preferable in the case of a bag film.

The composition of the present invention can be compounded by a known method which is generally used as a conventional resin composition compounding method. As an example thereof, after dry blending the above components (A) and (B) and optionally various additives using a mixer such as a tumbler, a ribbon blender or a Henschel type mixer, a single screw extruder or a twin screw extruder is used. The resin composition can be obtained by melt-mixing with a continuous melt-kneader such as, and extruding to prepare pellets.

As another compounding method, an ethylene / α-olefin copolymer having a density of 0.91 to 0.96 g / cm ³ of the component (A) and / or a low-pressure radical polymerization method of the component (B) is used. Density polyethylene, an antistatic agent of component (C) and an alkylenebis saturated higher fatty acid amide of component (D) are mixed and melt-kneaded to obtain a resin composition having a high concentration of both components (hereinafter referred to as a masterbatch). Then, the resin composition can also be obtained by a so-called masterbatch method in which the masterbatch is then mixed with the component (A) or the components (A) and (B).

In the present invention, an antifogging agent, an organic or inorganic filler, an antioxidant, a lubricant, an organic or inorganic pigment, a UV inhibitor, a dispersant, a nucleating agent, a foaming agent is added to the polyethylene resin composition. Known additives such as a flame retardant and a cross-linking agent can be added within a range that does not substantially impair the characteristics of the present invention.

The film of the present invention is a film formed from the above resin composition in which the above-mentioned specific compound and an antistatic agent are mixed in a specific ratio, and has an antistatic property, an opening property and an appropriate lubricity. It has excellent mechanical strength such as impact resistance. Recent demands for heavy-duty wrapping film are not suitable for automatic palletizer system even if the slip angle is too large (difficult to slip) or too small (slippery). Sexual control has become a very serious issue. Particularly in heavy packaging bags and the like, as described in the above-mentioned prior art, there is a problem that foreign substances such as powder of the contents adhere to the heat-sealed surface due to static electricity. Therefore, the film of the present invention is suitable for an automatic filling bag, a heavy packaging bag, and the like, which require high-speed moldability and the like.

The film of the present invention has a density of 0.88 to
The ethylene / α-olefin copolymer alone of 0.96 g / cm ³ may be used alone, but in consideration of high-speed moldability and bubble stability at the time of film molding, the low pressure obtained by the high-pressure radical polymerization method is used. It is preferable to add the density polyethylene in the range of 10 to 30% by weight.
In order to effectively develop the antistatic performance of the film of the present invention, it is preferable to subject the film to a surface treatment such as corona discharge treatment. By adopting such a method, the antistatic agent bleed out on the film surface and the antistatic property exert a synergistic effect due to the surface treatment effect.

As the antistatic performance of the film of the present invention, it is preferable that the surface specific resistance is less than 1 × 10 ¹³ . In the case of a film that does not satisfy this range, contaminants such as powder adhere to the heat seal surface due to static electricity,
There is a possibility that sufficient heat seal strength cannot be obtained.

The opening property of the film of the present invention is judged as blocking strength. The blocking strength is preferably less than 2.0 kgf / 10 cm ² ,
The blocking elongation is preferably less than 10%. A film that does not satisfy this range may have insufficient opening properties.

The lubricity of the film of the present invention is appropriately controlled, and specifically, the coefficient of static friction tan θ is 0.4.
It is preferably in the range of to 0.6. tan θ is 0.
If it is less than 4, the film may be too slippery to be suitable for a high-speed automatic filling and packaging machine, and there may be inconveniences such as collapse of the packaging bags stacked in the warehouse. Further, if tan θ exceeds 0.6, the lubricity is insufficient, and the work of filling the film is hindered, which is not preferable.

The film thickness of the present invention varies depending on the use, but the proper blending amount of the antistatic agent as the component (C) and the alkylenebis saturated higher fatty acid amide as the component (D) is determined depending on the film thickness. The appropriate blending amount is determined by the amount of bleeding on the film surface so that the opening property is improved and appropriate lubricity is maintained while maintaining the antistatic performance of the film.

In the case of a film for heavy packaging bags having a film thickness of 100 to 250 μm, the addition amount of the antistatic agent of the component (C) of the present invention is 100 to 1500 ppm, and the addition amount of the alkylenebis saturated higher fatty acid amide of the component (D) is Addition amount is 100
In the case of a film for a general packaging bag having a film thickness of up to 1000 ppm and a film thickness of 20 to 100 mm and a film for rice, sugar bag, etc., the addition amount of the component (C) is 300 to 2000 pp.
It is preferable that the added amount of m and the component (D) is 200 to 1500 ppm.

As the method for producing the film of the present invention, known molding methods such as an inflation molding method, a T-die molding method and a water-cooled film method can be used, but the invention is not limited thereto. When a polyethylene resin composition comprising the components (A) to (D) of the present invention is used as a raw material and a film is molded by an inflation molding method, the extruder used is a generally used film molding machine. Can be used, but especially screw diameter 25-200mm
It is preferable that φ and the screw L / D are 15 to 35. The extrusion conditions in the above inflation molding include an extrusion temperature of 160 to 250 ° C., preferably 180 to 2
20 ° C., die lip interval 0.5 to 5.0 mm, preferably 1.0 to 3.5 mm, blow-up ratio 1.0 to 4.
0, preferably 2.0 to 3.0, film thickness 20 to
A 250 μm film can be molded.

The film of the present invention is a general packaging film for fresh foods, processed foods, daily necessities, sundries, etc., a high-speed automatic filling packaging film for light packaging such as stationery, tissue paper, sanitary goods, rice, sugar bags, It is preferably used for antistatic films such as powder products, heavy fertilizers, resin pellets, heavy packing bags for chemicals, etc.

The test methods used for measuring the physical properties are as follows. (Physical property test method) Density: JIS K6760 compliant MFR: JIS K6760 compliant Blocking property (Nisseki Kabushiki Kaisha): A film sample was cut in the longitudinal direction (at the time of inflation molding) with a width of 2 cm, and the end portions of the inner surfaces were overlapped with each other. 0.
After curing at 60 ° C. for 5 hours under a load of 5 kg / cm ² , a chuck test was performed using a tensile tester manufactured by Orientec Co.
The distance at which the overlapped portions were peeled off at 0 mm and pulled at 500 mm / min was taken as the elongation rate, and the maximum load was taken as the blocking strength. Lubricity (Nisseki Kasei Co., Ltd.): Sliding angle (movement) of the film when the sliding gradient was changed at a tilt speed of 2.7 degrees / second using a static friction coefficient measuring instrument manufactured by Shinto Kagaku Co., Ltd. Block: 2
00g) was represented by the value of tan θ. Opening property: The film obtained by inflation molding is 40 cm wide x 60 cm long (content 20 k
In g), bags were made, and calcium silicate powder was subjected to a heat seal test with a filling machine and a top sealer manufactured by Neurong. At that time, those with poor mouth opening were automatically blown out of the filling machine system. evaluated. (Number of sheets / 50 sheets) 0 to 2 sheets: ○ 3 to 5 sheets: △ 6 sheets or more: × Surface specific resistance: JIS K6911 compliant (antistatic performance) Measured using HEWLETT / PACKARD, surface specific resistance measuring device did. Applied voltage: 500 V, application time: 60 seconds Contaminant seal strength: The top seal portion at the time of the evaluation of the opening property was observed and judged as follows. Items that are likely to be peeled off: × Items that are likely to be peeled off, but are okay to use: △ Items that are well sealed: ○

1. Material (A): Ethylene / α-olefin copolymer A1: C6-1: Linear low density polyethylene (ethylene-
1-hexene copolymer) [Density = 0.922 g / cm ³ MI = 0.5 g / 10
min Product name: Nisseki Linirex BF1350, manufactured by Nippon Petrochemical Co., Ltd.] A2: C4: 1 linear low density polyethylene (ethylene-1
-Butene copolymer) [Density = 0.923 g / cm ³ MI = 0.5 g / 10
min Product name: Nisseki Linirex BF1310, manufactured by Nippon Petrochemical Co., Ltd.]

(B): High-pressure radical method ethylene (co) polymer B1: High-pressure radical method polyethylene [Density = 0.923 g / cm ³ MI = 1.0 g / 10
min Product name: Nisseki; Lexron F22N, manufactured by Nippon Petrochemical Co., Ltd.]

(C): Antistatic agent C1: Antistatic agent A: Monoglyceride stearate [trade name: MB400, manufactured by Riken Vitamin Co., Ltd.] C2: Antistatic agent B: Stearyl diethanolamine [trade name: SE-165. Riken Vitamin Co., Ltd.]

(D): Alkylenebis saturated higher fatty acid amide D1: EBSA: Ethylenebisstearic acid amide [Product name: Sripax E, manufactured by Nippon Kasei Co., Ltd.] D2: EBOA: Ethylenebisoleic acid amide [Product name: Sripax] O, manufactured by Nippon Kasei Co., Ltd.] D3: anti-blocking agent; silica (diatomaceous earth) [Product name: Celite Super Floss, manufactured by John Manville Co.] D4: EA: erucic acid amide [Product name: Neutron] S, manufactured by Nippon Seika Co., Ltd.] D5: OA: oleic acid amide [trade name: Neutron, manufactured by Nippon Seika Co., Ltd.] D6: BA: behenic acid amide [trade name: BNT22
H, manufactured by Nippon Seika Co., Ltd.]

[0044]

【Example】

<Examples 1 to 9> The compounds having the composition shown in the attached table were mixed in a tumbler mixer, and then pelletized using a 50 mmφ extruder. 65m after that made by Modern Machinery
Using an inflation molding device equipped with an mφ extruder, a blow ratio of 2.55, a film thickness of 100 μm and a width of 400 mm, was used, and the processing amount per hour was 40 kg / h. The obtained film had a good sliding angle, a low blocking property, a good foreign matter sealing property and a good opening property, and satisfied all the properties required for a heavy bag film.

Comparative Example 1 EBSA used in Example 1
Was molded in the same manner as in Example 1 except that EBOA was changed to 400 ppm. As a result, the film had good openability, foreign matter sealing property, and surface resistivity, but the film was too slippery and unsuitable as a heavy bag film.

Comparative Example 2 EBSA used in Example 2
Was molded in the same manner as in Example 2 except that EBOA was changed to 800 ppm. As a result, the film had good openability, foreign matter sealing property, and surface resistivity, but the film was too slippery and unsuitable as a heavy bag film.

Comparative Example 3 EBSA used in Example 3
Was molded in the same manner as in Example 3 except that EBOA was changed to 800 ppm. As a result, the film had good opening property and foreign substance sealing property, but the surface resistivity was slightly lowered, and the film was too slippery and unsuitable as a heavy bag film.

Comparative Example 4 EBSA used in Example 4
Was molded in the same manner as in Example 1 except that EA was changed to 800 ppm instead of. As a result, the film was good in sealing foreign matters, but the surface resistivity was low, the opening property was poor, the film was too slippery, and blocking was severe, and it was unsuitable as a heavy bag film.

Comparative Example 5 EBSA used in Example 2
Was molded in the same manner as in Example 2 except that OA was changed to 600 ppm instead of No. 1 and antistatic agent B was used instead of antistatic agent A. As a result, the film had a good foreign matter sealing property, but the surface resistivity was low, the opening property was poor, the film was too slippery and blocking was severe, and it was unsuitable as a heavy bag film.

Comparative Example 6 EBSA used in Example 2
Molding was carried out in the same manner as in Example 2 except that BA was set to 600 ppm in place of, and antistatic agent B was used in place of antistatic agent A. As a result, the film had a good foreign matter sealing property, but the surface resistivity was low, the opening property was poor, and blocking was severe, and it was unsuitable as a heavy bag film.

Comparative Example 7 EBSA used in Example 1
Was molded in the same manner as in Example 1 except that EBOA was set to 400 ppm and no antistatic agent was used. As a result, the film had a good opening property, but the film was too slippery, the foreign matter sealing property and the surface resistivity value were high, and it was unsuitable as a heavy bag film.

Comparative Example 8 EBSA used in Example 2
Was molded in the same manner as in Example 1 except that EBOA was changed to 800 ppm and no antistatic agent was used. As a result, the film had a good opening property, but the film was too slippery, the foreign matter sealing property and the surface resistivity value were high, and it was unsuitable as a heavy bag film.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

INDUSTRIAL APPLICABILITY According to the present invention, a specific antistatic agent and a specific alkylenebis saturated higher fatty acid amide are added to a resin component containing a specific ethylene / α-olefin copolymer and an ethylene (co) polymer as main components. The added polyethylene resin composition, the film produced by using the composition is excellent in antistatic property, opening property, and low in slipperiness, and is a heavy packaging bag for fertilizers, chemicals, etc., rice, and sugar. It is suitable for bags.

Claims (7)

[Claims] 1. An antistatic agent of 100 to 2000 ps for a resin component in which an ethylene / α-olefin copolymer having a density of 0.88 to 0.96 g / cm ³ accounts for 50% by weight or more.
pm and alkylenebis saturated higher fatty acid amide 100
The polyethylene resin composition is characterized by containing ˜1500 ppm. 2. The polyethylene resin composition according to claim 1, wherein the resin component comprises the ethylene (co) polymer and 50% by weight or less of another ethylene polymer. 3. The polyethylene resin composition according to claim 1 or 2, wherein the antistatic agent is a polyhydric alcohol antistatic agent and / or an amine-substituted antistatic agent. 4. The polyethylene resin composition according to claim 1, wherein the alkylenebis saturated higher fatty acid amide is ethylenebisstearic acid amide. 5. The polyethylene resin composition according to claim 2, wherein the blending ratio of the ethylene (co) polymer by the high-pressure radical polymerization method is 10 to 30% by weight. 6. A film made of the polyethylene resin composition according to claim 1. 7. The static friction coefficient tan θ of the film is 0.4.
7. The film according to claim 6, which is in the range of from 0.6 to 0.6.