JP2023039232A - Antistatic agent for polyolefin-based resin and method for producing polyolefin-based resin composition - Google Patents

Abstract

To provide an antistatic agent pellet for polyolefin resin, the antistatic agent pellet exhibiting antistatic effect equivalent to that of a masterbatch and not generating odor after being molded, and to provide a method for producing polyolefin resin composition using the antistatic agent pellet for polyolefin resin.SOLUTION: An antistatic agent for polyolefin resin is provided, including a pellet (A) containing glycerin fatty acid ester as a main component, a pellet (B) containing alkyldiethanolamine as a main component, and a pellet (C) containing fatty acid ester of polyoxyethylene aliphatic amine as a main component.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to an antistatic agent for polyolefin resins and a method for producing a polyolefin resin composition.

When an antistatic agent is added to a thermoplastic resin such as polyolefin resin to produce a molded product, a masterbatch is generally used in which the antistatic agent is pre-melted and mixed with a part of the base resin and pelletized. there is By mixing a masterbatch containing a high-concentration antistatic agent with resin pellets containing no antistatic agent, the antistatic agent can be uniformly dispersed in the resin. However, the masterbatch is expensive to manufacture, and since the base resin of the masterbatch and the resin used for molding are not always the same, there are drawbacks such as deterioration in the physical properties of the molded product.

As a means for solving such problems, a method has been proposed in which an antistatic agent is pelletized into a shape similar to that of a masterbatch, thereby simultaneously solving handling property and cost reduction (Patent Document 1). , 2).
In Patent Document 1, fatty acid monoglyceride, N,N-bis(2-hydroxyethyl)alkylamine and/or N,N-bis(2-hydroxyethyl)fatty acid amide are separately granulated and mixed. An inhibitor granulation mixture is disclosed.
In Patent Document 2, (A) fatty acid monoester of polyoxyalkylenealkylamine and (B) higher fatty acid are mixed at a mass ratio of (A) component/(B) component = 1/4 to 4/1. An antistatic agent for polyolefin resin is disclosed which is obtained by pelletizing a mixture obtained by melt mixing.

Japanese Patent No. 2876183 JP-A-2002-179849

However, when pellets of an antistatic agent are directly mixed with a polyolefin resin for molding, the antistatic agent may not be uniformly dispersed in the resin under normal kneading conditions, and a sufficient effect may not be obtained. Further, as a result of studies by the present inventors, it has been found that if the kneading time is lengthened or if the resin pellets and the antistatic agent pellets are melt-mixed in advance before being fed into the extruder, the fatty acid ester component and the amine component react to form a fatty acid. was found to be the cause of the odor of the molded product.

An object of the present invention is to solve such problems, and an antistatic agent pellet for polyolefin resin that exhibits an antistatic effect equivalent to that of a masterbatch and does not generate odor after molding of a polyolefin resin composition, and an antistatic agent pellet thereof. An object of the present invention is to provide a method for producing the polyolefin resin composition used.

The present inventors have completed the present invention as a result of earnest research to achieve the above object.

That is, the present invention
[1] Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) containing alkyldiethanolamine as a main component,
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amines
antistatic agent for polyolefin resins.
[2] The glycerin fatty acid ester content is 1 to 50% by mass, the alkyldiethanolamine content is 10 to 50% by mass, and the alkyldiethanolamine, relative to the total mass of the pellets (A), pellets (B), and pellets (C). The antistatic agent for polyolefin resins according to [1], wherein the fatty acid ester content of is 20 to 80% by mass.
[3] The charge for polyolefin resin according to [1] or [2], wherein the ratio of free fatty acids to the total weight of the pellets (A), pellets (B) and pellets (C) is 5% by mass or less. inhibitor.
[4] For polyolefin resin,
Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) containing alkyldiethanolamine as a main component,
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amines
characterized by the addition of
A method for producing a polyolefin resin composition.
[5] Pellets made of polyolefin resin,
Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) mainly composed of alkyldiethanolamine,
and a step of dry blending the pellets (C) mainly composed of a fatty acid ester of a polyoxyethylene aliphatic amine to obtain a pellet mixture;
Having a step of heating and kneading the pellet mixture,
A method for producing a polyolefin resin composition.

The antistatic agent pellets of the present invention can impart excellent antistatic properties and antifogging properties to polyolefin resins from the initial stage of addition.
Moreover, the transparency and slipperiness of the polyolefin-based resin molded product are not impaired, and no odor is generated.

The antistatic agent for polyolefin resins of the present invention comprises pellets (A) containing glycerin fatty acid ester as the main component, pellets (B) containing alkyldiethanolamine as the main component, and polyoxyethylene aliphatic amine fatty acid ester as the main component. It is characterized by including a pellet (C) to be. The configuration of the present invention will be described in detail below.

In the present invention, the pellet (A) is a pellet containing glycerin fatty acid ester as a main component.

Glycerin fatty acid ester is an ester compound obtained by a known method such as an esterification reaction between glycerin and a fatty acid, or a transesterification reaction between glycerin and a fatty acid lower alkyl alcohol ester, and preferably glycerin with 8 to 22 carbon atoms. are monoesters and diesters obtained from fatty acids of , but triesters may be present.
These may be distilled or may be used as they are.

Fatty acids having 8 to 22 carbon atoms include saturated fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, arachidic acid and behenic acid, decenoic acid, undecenoic acid, Unsaturated fatty acids such as dodecenoic acid, tetradecenoic acid, oleic acid, erucic acid, linoleic acid, linoleic acid, and ricinoleic acid are included. Among these, lauric acid, myristic acid, palmitic acid, and stearic acid are preferred from the viewpoint of antistatic properties and bleeding properties, and palmitic acid and stearic acid are particularly preferred.

Glycerin fatty acid esters include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monooleate and the like.

In the present invention, "mainly composed of glycerin fatty acid ester" means that the content of glycerin fatty acid ester in the pellet is 70% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more. It is preferably 95% by mass or more, particularly preferably 95% by mass or more, and may be 99% by mass or more.
The pellets (A) may contain components other than the glycerin fatty acid ester within a range that does not impair the effects of the present invention, but from the viewpoint of reducing the odor of the molded product, the free fatty acid content is 5% by mass. It is preferably 3% by mass or less, more preferably 3% by mass or less.

（式中、Ｒ^１は炭素数８～２２のアルキル基又はアルケニル基を示す。） In the present invention, the pellet (B) is a pellet mainly composed of alkyldiethanolamine represented by the following general formula (1).

(In the formula, R ¹ represents an alkyl or alkenyl group having 8 to 22 carbon atoms.)

Examples of alkyldiethanolamines include lauryldiethanolamine, myristyldiethanolamine, palmityldiethanolamine, and stearyldiethanolamine, with stearyldiethanolamine being particularly preferred.

In the present invention, "mainly composed of alkyldiethanolamine" means that the content of alkyldiethanolamine in the pellet is 70% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more. It is preferably 95% by mass or more, particularly preferably 95% by mass or more, and may be 99% by mass or more.

In the present invention, the pellet (C) is a pellet whose main component is a fatty acid ester of polyoxyethylene aliphatic amine (hereinafter also referred to as "amine ester compound").

（式中、Ｒ^２は炭素数８～２２のアルキル基又はアルケニル基、Ｒ^３は炭素数７～２１のアルキル基又はアルケニル基を示し、ｐ、ｑはエチレンオキサイドの平均付加モル数であって、ｐ＋ｑ＝１～１０となる数を示す。）
で表わされる化合物である。 Examples of amine ester compounds include monoesters and diesters obtained from polyoxyethylene aliphatic amines having a hydrocarbon group of 8 to 22 carbon atoms and fatty acids of 8 to 22 carbon atoms. From the viewpoint of obtaining, the monoester represented by the following general formula (2) is preferable.

(In the formula, R ² represents an alkyl or alkenyl group having 8 to 22 carbon atoms, R ³ represents an alkyl or alkenyl group having 7 to 21 carbon atoms, and p and q represent the average number of moles of ethylene oxide added. , p+q=1 to 10.)
It is a compound represented by

The amine ester compound is a polyoxyethylene alkylamine or polyoxyethylene alkenylamine which can be obtained by adding 1 to 10 mol of ethylene oxide to 1 mol of an alkylamine or alkenylamine having 8 to 22 carbon atoms, It can be obtained by reacting a saturated or unsaturated fatty acid having 8 to 22 carbon atoms.
Polyoxyethylene alkylamines or polyoxyethylene alkenylamines include polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, polyoxyethylene oleylamine. Among them, from the viewpoint of obtaining a good antistatic effect, p and q in the general formula (2) are preferably amine compounds in which p + q = 2 to 3, and amine compounds in which p + q = 2, specifically lauryldiethanolamine, myristyl Diethanolamine, palmityldiethanolamine, stearyldiethanolamine, and oleyldiethanolamine are more preferred, and stearyldiethanolamine is particularly preferred.
Examples of saturated or unsaturated fatty acids having 8 to 22 carbon atoms include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid and behenic acid.

Specific examples of amine ester compounds include lauryl diethanolamine monostearate, myristyl diethanolamine monooleate, palmityl diethanolamine monostearate, stearyl diethanolamine monolaurate, stearyl diethanolamine monostearate, stearyl diethanolamine monooleate, and stearyl diethanolamine monobehenate. , oleyl diethanolamine monostearate, etc., but are not limited to these. Further, there is no problem even if two or more kinds of the compounds represented by the general formula (2) are mixed and used.

Although the method for producing the amine ester compound is not particularly limited, a fatty acid usually charged at 0.5 to 2.0 mol per 1 mol of polyoxyethylene alkylamine or polyoxyethylene alkenylamine is added to 190 It can be produced by a method of esterification by dehydration reaction at a temperature of up to 230° C., or a method of transesterification with fatty acid methyl ester. These reactants may contain unreacted polyoxyethylenealkylamine or polyoxyethylenealkenylamine.

In the present invention, "mainly composed of polyoxyethylene fatty amine fatty acid ester" means that the content of the amine ester compound in the pellet is 70% by mass or more, and 80% by mass or more is It is preferably 90% by mass or more, particularly preferably 95% by mass or more, and may be 99% by mass or more. The pellet (C) may contain components other than the amine ester compound within a range that does not impair the effects of the present invention, but from the viewpoint of reducing the odor of the molded product, the free fatty acid content is 5% by mass. It is preferably 3% by mass or less, more preferably 3% by mass or less.

Each pellet constituting the antistatic agent for polyolefin resin of the present invention is a granular body having an average particle diameter of 2 to 7 mm, but from the viewpoint of handling property and uniform dispersion in the resin, the average particle diameter is 3. ~6 mm pellets are preferred. In the present invention, the average particle size is a value obtained by dividing the sum of the average major diameter and average minor diameter of pellets by two.
Pellets may be spherical, hemispherical, ellipsoidal, cuboidal, cylindrical, strand-shaped, etc., but may be crushed into chips or flakes. It may have a fixed shape, and its shape is not particularly limited.

A known technique can be used as a pelletization method for obtaining the pellets of the present invention. For example, a method of dripping the molten compound onto the surface of a cooling belt to form hemispherical granules, or a method of extruding the semi-molten compound from a die into noodles to form cylindrical granules, or the like can be used.
As an apparatus for hemispherically pelletizing, for example, Sandvik's rotoformer granulator is exemplified.

The antistatic agent for polyolefin resins of the present invention includes the pellets (A), (B), and (C). From the viewpoint of antistatic effect, each pellet preferably has a glycerin fatty acid ester content of 1 to 50% by mass, more preferably 5 to 40% by mass, more preferably 10 to 30% by mass, the content of the alkyldiethanolamine is preferably 10 to 50% by mass, more preferably 15 to 40% by mass, and the content of the amine ester compound is preferably 20 to 40% by mass. It is preferably blended so as to be 80% by mass, more preferably 40 to 70% by mass.
In addition, from the viewpoint of reducing the odor after molding of the polyolefin resin composition, the ratio of free fatty acids to the total mass of the pellets (A), pellets (B) and pellets (C) should be 5% by mass or less. It is preferably 3% by mass or less, and more preferably 3% by mass or less.

The polyolefin resin for which the antistatic agent for polyolefin resin of the present invention is used is not particularly limited, and known resins can be used. For example, homopolymers of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, copolymers of the α-olefins, and the α-olefins They include copolymers of monomers other than copolymerizable α-olefins and α-olefins, and mixtures thereof. Specifically, low-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, propylene-butene copolymer, propylene-ethylene-butene copolymer, ethylene/butene-1 copolymer, ethylene/propylene · Butene-1 copolymer, ethylene/acrylic acid copolymer, ionomer obtained by cross-linking ethylene/acrylic acid copolymer with metal ions, polybutene-1, and butene/ethylene copolymer. You may use these individually or in mixture of 2 or more types.

Examples of monomers other than the α-olefin that can be copolymerized with the α-olefin include vinyl acetate, maleic acid, vinyl alcohol, methacrylic acid, methyl methacrylate, and ethyl methacrylate.

A polyolefin resin composition can be obtained by heating and kneading a polyolefin resin and the antistatic agent of the present invention. A known mixer or extruder such as a Banbury mixer, a Henschel mixer, a tumbler mixer, a single-screw extruder and a multi-screw extruder can be used for heat kneading. Each pellet constituting the antistatic agent of the present invention may be added to the polyolefin resin separately, or may be dry-blended in advance and then added to the polyolefin resin. In addition, from the viewpoint of facilitating the dispersion of the antistatic agent component in the resin and suppressing the generation of fatty acids during heat kneading to reduce the odor of the molded product, before heat kneading the resin pellets and antistatic agent pellets. It is preferable to dry blend in advance.

The content of the antistatic agent of the present invention contained in the polyolefin resin composition is not particularly limited, but it is preferably 0.1 to 3 parts by mass, more preferably 0, per 100 parts by mass of the polyolefin resin. 0.5 to 2 parts by weight, particularly preferably 0.8 to 1.5 parts by weight. Within this range, it is possible to provide a polyolefin-based resin molded product particularly excellent in antistatic properties.

Various additives commonly used in polyolefin resin compositions can be added to the polyolefin resin composition as long as they do not impair the object of the present invention. Examples of various additives include antifogging agents, antioxidants, weathering agents, ultraviolet absorbers, stabilizers, slip agents, tackifiers, antiblocking agents and the like.

The polyolefin-based resin composition can be molded into any moldings such as films, sheets, bottles, filaments, and injection-molded articles.

Examples of the method for producing a polyolefin resin film formed by molding the polyolefin resin composition include a T-die method, an inflation method, and a calender method. method is preferred. As an example of the T-die method, polyolefin resin pellets and antistatic agent pellets of the present invention are supplied to an extruder hopper, and the extruder is set to a cylinder temperature of 180 to 240 ° C. and a T die temperature of 200 to 230 ° C. The mixture is heated, melt-kneaded, extruded, and cooled with a cooling roll controlled at 20 to 40° C. to obtain an unstretched sheet having a thickness of 100 to 500 μm. For the purpose of imparting strength and other functions to the film, a co-extrusion method and lamination with other films can be used to form multiple layers.

As a method for biaxially stretching the unstretched sheet, any of a simultaneous biaxially stretching method using a tenter system and a sequential biaxially stretching method using rolls and a tenter may be used. As a representative example of simultaneous biaxial stretching, the unstretched sheet obtained as described above is stretched to a surface ratio of 9 to 16 times with a tenter having a preheating/stretching temperature of 70 to 90° C. and a heat setting temperature of 100 to 150° C. to obtain a film. get In addition, as a typical example of sequential biaxial stretching, an unstretched sheet is stretched in the longitudinal direction at a roll surface temperature of 50 to 80° C. and a stretch ratio of 1.5 to 5 times depending on the rotation speed ratio of the driving rolls, and then continuously stretched. A film is obtained by stretching in the transverse direction under conditions of a stretching temperature of 50 to 90°C, a stretching ratio of 1.5 to 8 times, and a heat setting temperature of 100 to 150°C.

The thickness of the polyolefin-based film is not particularly limited, and may be appropriately set depending on the application, required performance, price, and the like. Generally, a thickness of about 10 to 100 μm can be exemplified. Furthermore, the film may be surface-treated for the purpose of improving the printability, laminateability, coating suitability, and the like of the film. Examples of surface treatment methods include corona discharge treatment, plasma treatment, and acid treatment, and any method can be used. Among these, corona discharge treatment can be exemplified as the most preferable treatment in terms of simplicity.

EXAMPLES The present invention will be described in more detail below based on examples, but the present invention is not limited to these. Unless otherwise specified, the blending amount is shown in parts by mass.

In this example, the average particle size of the pellets and the amount of free fatty acids in the antistatic agent pellets were measured by the following methods.
<Average particle size of pellet>
The major axis and minor axis of 10 or more pellets are measured with a vernier caliper, and each average value is taken as the average major axis or average minor axis of the pellet. A value obtained by dividing the total value of the calculated average major axis and average minor axis by 2 is taken as the number average particle diameter of the pellet.

<Method for measuring free fatty acid content>
A sufficient amount of the mixture of antistatic agent pellets is sampled and dissolved so that the ratio of each component in the measurement sample is not biased with respect to the mixing ratio of pellets (A) to (C), and then quickly gassed. It was used for chromatographic measurement. Gas chromatography was measured using GC-2010Plus (Shimadzu Corporation) under the following conditions.
(Measurement condition)
Capillary column: CP-Sil 8 CB for Amines (manufactured by J & W Scientific),
Mobile phase: helium, column flow rate: 1.0 mL/min, temperature increase program: 100° C. hold for 1 minute → 100 to 320° C. (10° C./min temperature rise) → 320° C. hold for 10 minutes, equilibration time: 1 minute , inlet: split injection (split ratio: 100:1), pressure 14.49 psi, 104 mL/min, injection volume: 2 μL, wash vial: chloroform, detector temperature: 320°C.

<Method for producing antistatic agent pellet>
(Example 1)
Glycerin monostearate (a-1) is charged in a blending tank, heated to 80° C. to liquefy, and then granulated into hemispherical pellets with an average particle diameter of 4 mm using a rotoformer granulator to prevent static electricity. Agent pellets (A-1) were obtained.
Similarly, stearyldiethanolamine (b-1) and stearyldiethanolamine monostearate (c-1) were granulated to obtain pellets (B-1) and pellets (C-1).
Each pellet was mixed in a mixer at a mass ratio of A-1/B-1/C-1=30/20/50 to obtain a mixture of antistatic agent pellets.

(Example 2)
The pellets obtained in Example 1 were mixed in a mixer at a mass ratio of A-1/B-1/C-1=10/20/70 to obtain a mixture of antistatic agent pellets.

(Example 3)
Similarly, glycerin monopalmitate (a-2), palmityl diethanolamine (b-2), and palmityl diethanolamine monostearate (c-2) were heat-melted and granulated using a rotoformer granulation equipment. , pellet (A-2), pellet (B-2) and pellet (C-2) were obtained.
Each pellet was mixed in a mixer at a mass ratio of A-2/B-2/C-2=30/20/50 to obtain a mixture of antistatic agent pellets.

(Example 4)
The pellets obtained in Example 3 were mixed in a mixer at a mass ratio of A-2/B-2/C-2=10/20/70 to obtain a mixture of antistatic agent pellets.

(Comparative example 1)
Stearyl diethanolamine monostearate (c-1) and stearic acid are melt-mixed at a mass ratio of 50/50, and hemispherical pellets having an average particle size of 4 mm are granulated using a rotoformer granulator. Obtained.

(Comparative example 2)
Palmityl diethanolamine monostearate (c-2) and palmitic acid are melt-mixed at a mass ratio of 50/50, and hemispherical pellets having an average particle size of 4 mm are granulated with a rotoformer granulator. got

(Comparative Example 3)
Stearyl diethanolamine monostearate (c-1) and stearic acid are melt-mixed at a mass ratio of 60/40, and hemispherical pellets having an average particle size of 4 mm are granulated with a rotoformer granulator, and mixture pellets 3 are obtained. Obtained.
The pellets (A-1) obtained in Example 1 and the mixture pellets 3 were mixed at a mass ratio of 50/50 to obtain a mixture of antistatic agent pellets.

(Comparative Example 4)
Palmityl diethanolamine monostearate (c-2) and palmitic acid are melt-mixed at a mass ratio of 60/40, and hemispherical pellets having an average particle size of 4 mm are granulated with a rotoformer granulator. got
The pellets (A-2) obtained in Example 3 and the mixture pellets 4 were mixed at a mass ratio of 50/50 to obtain a mixture of antistatic agent pellets.

(Comparative Example 5)
The pellets (A-1) and (B-1) obtained in Example 1 were mixed at a mass ratio of A-1/B-1=50/50 to obtain a mixture of antistatic agent pellets.

(Comparative Example 6)
The pellets (A-2) and (B-2) obtained in Example 3 were mixed at a mass ratio of A-2/B-2=50/50 to obtain a mixture of antistatic agent pellets.

(Comparative Example 7)
Glycerin monostearate, stearyl diethanolamine, and stearyl diethanolamine monostearate are melt-mixed at a mass ratio of 30/20/50, and granulated into hemispherical pellets having an average particle size of 4 mm using a rotoformer granulator. A pellet 5 was obtained.

<Film manufacturing method>
The antistatic agent pellets were mixed at a rate of 1 part by mass with respect to 100 parts by mass of polypropylene resin pellets having a melt flow rate of 7.5 g/10 minutes. The mixture was added to a polyethylene bag and shaken by hand for dry blending.
Thereafter, a mixture of antistatic agent pellets and resin pellets was supplied to an extruder, and a non-stretched film (CPP) was produced by the T-die method. The produced film was stored in a constant temperature bath at a temperature of 25° C. and a humidity of 50% for 1 day or 14 days, and then evaluated for antistatic properties (surface specific resistance) and antifogging properties according to the following criteria. In addition, after storing the molded film for 14 days under the above conditions, the slipperiness (coefficient of friction) and transparency (HAZE) were evaluated according to the following criteria. After the molded film was stored under the above conditions for 1 day, the odor of the film was evaluated according to the following criteria. Table 1 shows the evaluation results.

(1) Antistatic property (surface specific resistance value)
The film after production is placed between the main electrode and the counter electrode using a high resistance insulation tester (Hiresta UP MCPHT450, manufactured by Mitsubishi Chemical Analytech Co., Ltd.) in an atmosphere of 25 ° C. and 50% RH. , and the surface specific resistance value was measured at an applied voltage of 500 V according to JIS-K-6911.

(2) Antifogging property Put 100 ml of water in a 200 ml beaker, fix the produced film on the beaker with a rubber band, and store in a constant temperature machine (5°C) for 30 minutes. After that, a piece of paper on which letters were written was placed under the beaker, and it was observed to what extent the film surface and the letters placed below were visible.
5: The wet area of the film surface is 95% or more, and the characters below are clearly visible.
4: The wet area of the film surface is 50% or more and less than 95%, and the characters below can be read.
3: The wet area of the film surface is 30% or more and less than 50%, and the letters below appear blurred.
2: The wet area of the film surface is 10% or more and less than 30%, and the characters below appear blurred.
1: The wet area of the film surface is 0% or more and less than 10%, and the characters cannot be seen.

(3) Odor 50 pieces of film cut into 30 cm length×30 cm width were enclosed in a polyethylene bag, stored at 80° C. for 24 hours, and the odor of the air inside was evaluated by sensory evaluation. The index of odor was judged according to the following five-level criteria, and the median value of 10 participants who confirmed the odor was calculated as the evaluation result.
5: Slight odor, but no unpleasant odor.
4: Odor, but no unpleasant odor.
3: There is an odor and it feels a little unpleasant.
2: There is an odor and it feels unpleasant.
1: The odor is strong and feels very unpleasant.

(4) Transparency (Haze)
The haze of the films obtained in Examples and Comparative Examples was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: NDH300A) according to JIS K7105.

(5) Slipperiness (coefficient of friction)
The slipperiness was evaluated by the value of the dynamic friction coefficient shown below.
The dynamic friction coefficient (μd) of the produced film is measured according to JISK7125-ISO8295 (plastic-film and sheet-friction coefficient test method) using a friction measuring machine TR-2 (manufactured by Toyo Seiki Co., Ltd.). The measurement conditions are temperature and humidity of 20° C.×45%, R.O. H. is.

From the results of Examples, the polypropylene resin compositions of Examples 1 to 4 containing the antistatic agent of the present invention were excellent in all evaluation items.
On the other hand, the mixture pellets of Comparative Examples 1 to 4 did not exhibit antistatic properties and antifogging properties, and had a strong odor due to the large amount of fatty acid contained therein. Moreover, the antistatic agents of Comparative Examples 5 and 6, which did not contain an amine ester compound, were inferior in antistatic properties and antifogging properties. Comparative Example 7 was inferior in initial antistatic properties and antifogging properties. In addition, there was an odor derived from the fatty acid generated during melt mixing.

Claims (5)

Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) containing alkyldiethanolamine as a main component,
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amines
antistatic agent for polyolefin resins. The content of glycerin fatty acid ester is 1 to 50% by mass, the content of alkyldiethanolamine is 10 to 50% by mass, and the fatty acid ester of alkyldiethanolamine, relative to the total mass of the pellets (A), pellets (B), and pellets (C). The antistatic agent for polyolefin resin according to claim 1, wherein the content of is 20 to 80% by mass. 3. The antistatic agent for polyolefin resin according to claim 1, wherein the ratio of free fatty acid to the total mass of said pellets (A), pellets (B) and pellets (C) is 5% by mass or less. For polyolefin resin,
Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) containing alkyldiethanolamine as a main component,
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amines
characterized by adding and mixing
A method for producing a polyolefin resin composition. Pellets made of polyolefin resin,
Pellets (A) mainly composed of glycerin fatty acid ester,
Pellets (B) containing alkyldiethanolamine as a main component,
and a step of dry blending the pellets (C) mainly composed of a fatty acid ester of a polyoxyethylene aliphatic amine to obtain a pellet mixture;
Having a step of heating and kneading the pellet mixture,
A method for producing a polyolefin resin composition.