JP7709344B2 - Antistatic agent for polyolefin resin and method for producing polyolefin resin composition - Google Patents

Description

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

When manufacturing molded products by adding an antistatic agent to a thermoplastic resin such as polyolefin resin, a masterbatch is generally used in which the antistatic agent is melt-mixed with a portion of the base resin and pelletized in advance. By mixing a masterbatch containing a high concentration of antistatic agent with resin pellets that do not contain the antistatic agent, the antistatic agent can be uniformly dispersed in the resin. However, masterbatches have drawbacks such as high manufacturing costs and the resin properties of the molded product may be reduced because the base resin of the masterbatch and the resin used for molding are not necessarily the same.

As a means for solving such problems, a method has been proposed in which an antistatic agent is pelletized in the same shape as the masterbatch, thereby simultaneously solving the problems of ease of handling and reducing costs (see Patent Documents 1 and 2).
Patent Document 1 discloses an antistatic agent granulated mixture in which a fatty acid monoglyceride and an N,N-bis(2-hydroxyethyl)alkylamine and/or an N,N-bis(2-hydroxyethyl)fatty acid amide are each granulated separately and then mixed.
Patent Document 2 discloses an antistatic agent for polyolefin resins, which is obtained by melt-mixing (A) a fatty acid monoester of polyoxyalkylene alkylamine and (B) a higher fatty acid in a mass ratio of component (A)/component (B) of 1/4 to 4/1, and pelletizing the resulting mixture.

Patent No. 2876183 JP 2002-179849 A

However, when pellets of an antistatic agent are mixed directly with a polyolefin resin and molded, the antistatic agent does not disperse uniformly in the resin under normal kneading conditions, and sufficient effects may not be obtained. Furthermore, as a result of the inventors' investigations, it was found that if the kneading time is extended or if the resin pellets and the antistatic agent pellets are melt-mixed before being fed into the extruder, the fatty acid ester component reacts with the amine component to generate fatty acids, which cause odors in the molded product.

The object of the present invention is to solve these problems by providing antistatic agent pellets for polyolefin resins that exhibit the same antistatic effect as a masterbatch and do not emit odors after molding of the polyolefin resin composition, and a method for producing a polyolefin resin composition using the same.

The inventors conducted extensive research to achieve the above objective, and as a result, have completed the present invention.

That is, the present invention provides
[1] Pellets (A) containing glycerin fatty acid ester as a main component;
Pellets containing alkyldiethanolamine as a main component (B),
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene fatty amines.
1. An antistatic agent for polyolefin resins comprising:
[2] The antistatic agent for polyolefin resins according to [1], wherein the content of the glycerin fatty acid ester is 1 to 50 mass%, the content of the alkyldiethanolamine is 10 to 50 mass%, and the content of the fatty acid ester of the alkyldiethanolamine is 20 to 80 mass%, relative to the total mass of the pellets (A), (B), and (C).
[3] The antistatic agent for polyolefin resins according to [1] or [2], wherein the ratio of free fatty acids to the total mass of the pellets (A), (B) and (C) is 5 mass% or less.
[4] For polyolefin resins,
Pellets (A) mainly composed of glycerin fatty acid esters;
Pellets containing alkyldiethanolamine as a main component (B),
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene fatty amines.
Adding
A method for producing a polyolefin resin composition.
[5] Pellets made of a polyolefin-based resin;
Pellets (A) mainly composed of glycerin fatty acid esters;
Pellets containing alkyldiethanolamine as a main component (B),
and a pellet (C) mainly composed of a fatty acid ester of a polyoxyethylene aliphatic amine, to obtain a pellet mixture;
A step of heating and kneading the pellet mixture is included.
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.
Furthermore, the transparency and lubricity of polyolefin resin molded products are not impaired, and no odor is generated.

The antistatic agent for polyolefin resins of the present invention is characterized by including pellets (A) mainly composed of glycerin fatty acid ester, pellets (B) mainly composed of alkyldiethanolamine, and pellets (C) mainly composed of fatty acid ester of polyoxyethylene aliphatic amine. The configuration of the present invention will be described in detail below.

In the present invention, pellets (A) are pellets whose main component is glycerin fatty acid ester.

The 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 is preferably a monoester or diester obtained from glycerin and a fatty acid having 8 to 22 carbon atoms, but a triester may also be present.
These may be used in a distilled form or in an undistilled form.

Examples of 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, and unsaturated fatty acids such as decenoic acid, undecenoic acid, dodecenoic acid, tetradecenoic acid, oleic acid, erucic acid, linoleic acid, linolenic acid, and ricinoleic acid. Among these, lauric acid, myristic acid, palmitic acid, and stearic acid are preferred from the viewpoint of antistatic properties and bleeding properties, with palmitic acid and stearic acid being particularly preferred.

Glycerol fatty acid esters include glycerol monolaurate, glycerol monomyristate, glycerol monopalmitate, glycerol monostearate, glycerol monobehenate, glycerol monooleate, etc.

In the present invention, "containing glycerin fatty acid ester as a main component" means that the content of glycerin fatty acid ester in the pellet is 70% by mass or more, preferably 80% by mass or more, more preferably 90% 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 esters as long as the effects of the present invention are not impaired. From the viewpoint of reducing the odor of the molded product, however, the content of free fatty acids is preferably 5% by mass or less, and more preferably 3% by mass or less.

In the present invention, the pellets (B) are pellets containing, as a main component, an alkyldiethanolamine represented by the following general formula (1).
(In the formula, R ¹ represents an alkyl group or alkenyl group having 8 to 22 carbon atoms.)

Examples of alkyl diethanolamines include lauryl diethanolamine, myristyl diethanolamine, palmityl diethanolamine, and stearyl diethanolamine, with stearyl diethanolamine being particularly preferred.

In the present invention, "containing alkyldiethanolamine as a main component" means that the content of alkyldiethanolamine in the pellet is 70% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, particularly preferably 95% by mass or more, and may be 99% by mass or more.

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

Examples of the amine ester compound include monoesters and diesters obtained from polyoxyethylene aliphatic amines having a hydrocarbon group having 8 to 22 carbon atoms and fatty acids having 8 to 22 carbon atoms. From the viewpoint of obtaining a good antistatic effect, the monoester represented by the following general formula (2) is preferred.
(In the formula, ^R2 represents an alkyl or alkenyl group having 8 to 22 carbon atoms, ^R3 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, such that p+q=1 to 10.)
It is a compound represented by the formula:

The amine ester compound can be obtained by reacting a polyoxyethylene alkylamine or a polyoxyethylene alkenylamine, which can be obtained by adding 1 to 10 moles of ethylene oxide to 1 mole of an alkylamine or an alkenylamine having 8 to 22 carbon atoms, with a saturated or unsaturated fatty acid having 8 to 22 carbon atoms.
Examples of polyoxyethylene alkylamines or polyoxyethylene alkenylamines include polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, and polyoxyethylene oleylamine. Among these, from the viewpoint of obtaining a good antistatic effect, amine compounds in which p and q in the general formula (2) are p+q=2 to 3 are preferred, and amine compounds in which p+q=2, specifically lauryl diethanolamine, myristyl diethanolamine, palmityl diethanolamine, stearyl diethanolamine, and oleyl diethanolamine, are more preferred, and stearyl diethanolamine 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, but are not limited to, lauryl diethanolamine monostearate, myristyl diethanolamine monooleate, palmityl diethanolamine monostearate, stearyl diethanolamine monolaurate, stearyl diethanolamine monostearate, stearyl diethanolamine monooleate, stearyl diethanolamine monobehenate, and oleyl diethanolamine monostearate. In addition, there is no problem in using a mixture of two or more compounds represented by general formula (2).

The method for producing the amine ester compound is not particularly limited, but it can be produced by a method in which fatty acid, usually 0.5 to 2.0 moles per mole of polyoxyethylene alkylamine or polyoxyethylene alkenylamine, is subjected to a dehydration reaction at a temperature of 190 to 230°C to esterify it, or by a method in which fatty acid methyl ester is subjected to an ester exchange reaction. Note that these reaction products may contain unreacted polyoxyethylene alkylamine or polyoxyethylene alkenylamine.

In the present invention, "mainly composed of fatty acid ester of polyoxyethylene aliphatic amine" means that the content of the amine ester compound in the pellet is 70% by mass or more, preferably 80% by mass or more, more 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 effect of the present invention, but from the viewpoint of reducing the odor of the molded product, the content of free fatty acid is preferably 5% by mass or less, and more preferably 3% by mass or less.

The pellets constituting the antistatic agent for polyolefin resin of the present invention are granular bodies usually having an average particle size of 2 to 7 mm, but from the viewpoints of handling and uniform dispersion in the resin, the average particle size of the pellets is preferably 3 to 6 mm. In the present invention, the average particle size is the value obtained by dividing the sum of the average major axis and the average minor axis of the pellets by 2.
The shape of the pellets is not particularly limited, and may be a definite shape such as a sphere, hemisphere, oval sphere, rectangular parallelepiped, cylindrical, or strand shape, or may be an irregular shape such as chips formed by pulverization or flakes.

The pelletization method for obtaining the pellets of the present invention can be performed using known techniques, such as a method of dropping a molten compound onto a cooling belt surface and granulating the compound into hemispherical pellets, or a method of extruding a compound in a semi-molten state through a die into noodle-like pellets and granulating the compound into cylindrical pellets.
An example of a device for pelletizing into semispherical pellets is a rotoformer pelletizer manufactured by Sandvik.

The antistatic agent for polyolefin resins of the present invention includes the pellets (A), (B), and (C). From the viewpoint of antistatic effect, it is preferable that each pellet is blended so that the content of glycerin fatty acid ester is preferably 1 to 50 mass%, more preferably 5 to 40 mass%, and even more preferably 10 to 30 mass%, the content of alkyldiethanolamine is preferably 10 to 50 mass%, more preferably 15 to 40 mass%, and the content of amine ester compound is preferably 20 to 80 mass%, more preferably 40 to 70 mass%, based on the total mass of pellets (A), (B), and (C).
In addition, from the viewpoint of reducing odor after molding of the polyolefin resin composition, the ratio of free fatty acids to the total mass of pellets (A), pellets (B) and pellets (C) is preferably 5 mass% or less, and more preferably 3 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 polyolefin resins can be used. For example, homopolymers of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, and 4-methyl-1-pentene, copolymers of the above-mentioned α-olefins, copolymers of α-olefins and monomers other than α-olefins that can be copolymerized with the above-mentioned α-olefins, and mixtures thereof. Specific examples include 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, ionomers obtained by crosslinking ethylene-acrylic acid copolymers with metal ions, polybutene-1, and butene-ethylene copolymers. These may be used alone or in a mixture of two or more.

Examples of monomers other than α-olefins that can be copolymerized with the α-olefins 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. For the heating and kneading, a known mixer or extruder such as a Banbury mixer, a Henschel mixer, a tumbler mixer, a single-screw extruder, or a multi-screw extruder can be used. Each pellet constituting the antistatic agent of the present invention may be added separately to the polyolefin resin, or may be dry-blended in advance and then added to the polyolefin resin. In addition, from the viewpoint of facilitating dispersion of the antistatic agent components in the resin and suppressing the generation of fatty acids during heating and kneading to reduce the odor of the molded product, it is preferable to dry-blend the resin pellets and the antistatic agent pellets in advance before heating and kneading.

There is no particular limit to the content of the antistatic agent of the present invention contained in the polyolefin resin composition, but it is preferably 0.1 to 3 parts by mass, more preferably 0.5 to 2 parts by mass, and particularly preferably 0.8 to 1.5 parts by mass, per 100 parts by mass of polyolefin resin. If it is within this range, it is possible to provide a polyolefin resin molded product with particularly excellent antistatic properties.

The polyolefin resin composition may contain various additives that are typically used in polyolefin resin compositions, provided that the purpose of the present invention is not impaired. Examples of the various additives include antifogging agents, antioxidants, weather resistance agents, UV absorbers, stabilizers, slip agents, tackifiers, and antiblocking agents.

The polyolefin resin composition can be molded into any type of molded product, such as a film, sheet, bottle, filament, or injection molded product.

Examples of methods for producing a polyolefin resin film obtained by molding the polyolefin resin composition include the T-die method, inflation method, and calendar method. Among these, the T-die method, which uses a T-die to melt-mix and extrude, is preferred. As an example of the T-die method, pellets of a polyolefin resin and pellets of the antistatic agent of the present invention are fed to an extruder hopper, the extruder is heated to, for example, a cylinder temperature of 180 to 240°C and a T-die temperature of 200 to 230°C, melt-mixed and 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. Co-extrusion or lamination with other films can also be used to give the film strength or other functions.

The biaxial stretching method of the unstretched sheet may be either simultaneous biaxial stretching using a tenter system or sequential biaxial stretching using a roll and tenter. A typical example of simultaneous biaxial stretching is to stretch the unstretched sheet obtained as described above to an areal stretching ratio of 9 to 16 times using a tenter with a preheating/stretching temperature of 70 to 90°C and a heat setting temperature of 100 to 150°C to obtain a film. A typical example of sequential biaxial stretching is to stretch the unstretched sheet in the longitudinal direction at a roll surface temperature of 50 to 80°C and a stretching ratio of 1.5 to 5 times depending on the rotation speed ratio of the driving roll, and then continuously stretch it 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 to obtain a film.

There are no particular restrictions on the thickness of the polyolefin film, and it may be set appropriately depending on the application, required performance, price, etc. A typical thickness is about 10 to 100 μm. Furthermore, the film may be surface-treated to improve the printability, lamination, coating suitability, etc. of the film. Surface treatment methods include corona discharge treatment, plasma treatment, acid treatment, etc., and any of these methods can be used. Of these, corona discharge treatment is the most preferable from the standpoint of simplicity.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. Unless otherwise specified, the blend amounts are shown in parts by weight.

In the present examples, 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 pellets>
The major axis and minor axis of 10 or more pellets are measured with a vernier caliper, and the average value is regarded as the average major axis or minor axis of the pellets. The sum of the calculated average major axis and average minor axis is divided by 2 to be the number-average particle size of the pellets.

<Method for measuring free fatty acid content>
A sufficient amount of each mixture of antistatic agent pellets was taken and dissolved so that the ratio of each component in the measurement sample would not be biased relative to the mixing ratio of pellets (A) to (C), and then immediately subjected to gas chromatography measurement. Gas chromatography was performed using a GC-2010Plus (Shimadzu Corporation) under the following conditions.
(Measurement conditions)
Capillary column: CP-Sil 8 CB for Amines (manufactured by J&W Scientific),
Mobile phase: helium, column flow rate: 1.0 mL/min, heating program: hold at 100°C for 1 min → 100-320°C (heat rise 10°C/min) → hold at 320°C for 10 min, equilibration time: 1 min, injection port: split injection (split ratio: 100:1), pressure 14.49 psi, 104 mL/min, injection volume: 2 μL, washing vial: chloroform, detector temperature: 320°C

<Method of manufacturing antistatic agent pellets>
Example 1
Glycerin monostearate (a-1) was charged into a blending tank and liquefied by heating to 80° C., and then granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulating equipment to obtain antistatic agent pellets (A-1).
Similarly, stearyl diethanolamine (b-1) and stearyl diethanolamine monostearate (c-1) were each granulated to obtain pellets (B-1) and pellets (C-1).
The pellets were mixed in a mixer in 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 in 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 each heated and melted and granulated in a rotoformer granulation system to obtain pellets (A-2), (B-2), and (C-2).
The pellets were mixed in a mixer in 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 in 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 were melt-mixed in a mass ratio of 50/50, and granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulator to obtain mixture pellets 1.

(Comparative Example 2)
Palmityl diethanolamine monostearate (c-2) and palmitic acid were melt-mixed in a mass ratio of 50/50 and granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulator to obtain mixture pellets 2.

(Comparative Example 3)
Stearyl diethanolamine monostearate (c-1) and stearic acid were melt-mixed in a mass ratio of 60/40, and granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulator to obtain mixture pellets 3.
The pellets (A-1) obtained in Example 1 and the mixture pellets 3 were mixed in 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 were melt-mixed in a mass ratio of 60/40, and granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulator to obtain mixture pellets 4.
The pellets (A-2) obtained in Example 3 and the mixture pellets 4 were mixed in 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 in 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 in 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 were melt-mixed in a mass ratio of 30/20/50 and granulated into semispherical pellets having an average particle size of 4 mm using a rotoformer granulation facility, to obtain mixture pellets 5.

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

(1) Antistatic properties (surface resistivity)
The prepared film was sandwiched between a main electrode and a counter electrode in an atmosphere of 25° C. and 50% RH using a high resistance insulation tester (Hiresta UP MCPHT450, manufactured by Mitsubishi Chemical Analytech Co., Ltd.), and the surface resistivity was measured at an applied voltage of 500 V in accordance with JIS-K-6911.

(2) Anti-fogging property 100 ml of water was placed in a 200 ml beaker, the prepared film was placed on the beaker and fixed with a rubber band, and stored in a thermostatic chamber (5° C.) for 30 minutes. After that, a piece of paper with writing was placed under the beaker, and the degree to which the writing placed under the paper was visible from the film surface was observed.
5: 95% or more of the film surface is wetted, and the letters underneath are clearly visible.
4: The wet area of the film surface is 50% or more and less than 95%, and the text underneath is legible.
3: The wet area of the film surface is 30% or more and less than 50%, and the characters underneath appear blurred.
2: The wet area of the film surface is 10% or more and less than 30%, and the characters underneath appear blurred.
1: The wet area of the film surface is 0% or more and less than 10%, and the characters are not visible.

(3) Odor 50 pieces of film cut to 30 cm length x 30 cm width were sealed in a polyethylene bag and stored at 80°C for 24 hours, after which the odor of the air contained therein was evaluated by sensory evaluation. The odor index was judged according to the following 5-level standard, and the median value of the 10 participants who participated in the odor confirmation was calculated to obtain the evaluation result.
5: There is a slight odor, but it is not unpleasant.
4: There is an odor, but it is not an unpleasant odor.
3: The odor is unpleasant and somewhat unpleasant.
2: The odor is unpleasant.
1: The odor is strong and very unpleasant.

(4) Transparency (haze)
The haze of the films obtained in the examples and comparative examples was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name: NDH300A) in accordance with JIS K7105.

(5) Slipperiness (coefficient of friction)
The slipperiness was evaluated based on the dynamic friction coefficient shown below.
The dynamic friction coefficient (μd) of the film after preparation is measured using a friction tester TR-2 (manufactured by Toyo Seiki Seisakusho) in accordance with JIS K7125-ISO8295 (Plastics - Films and Sheets - Friction Coefficient Test Method). The measurement conditions are temperature and humidity of 20°C x 45%, RH.

From the results of the examples, all of the polypropylene resin compositions of Examples 1 to 4, in which the antistatic agent of the present invention was blended, were excellent in all evaluation items.
In contrast, the mixture pellets of Comparative Examples 1 to 4 did not provide antistatic or antifogging properties, and had a strong odor due to the incorporation of a large amount of fatty acid. The antistatic agents of Comparative Examples 5 and 6, which did not incorporate an amine ester compound, were inferior in antistatic and antifogging properties. Comparative Example 7 was inferior in initial antistatic and antifogging properties. There was also an odor due to fatty acid generated during melt mixing.

Claims (5)

Pellets (A) mainly composed of glycerin fatty acid esters;
Pellets containing alkyldiethanolamine as a main component (B),
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene fatty amines.
1. An antistatic agent for polyolefin resins comprising: The antistatic agent for polyolefin resins according to claim 1, wherein the content of glycerin fatty acid ester is 1 to 50 mass%, the content of alkyldiethanolamine is 10 to 50 mass%, and the content of fatty acid ester of alkyldiethanolamine is 20 to 80 mass% relative to the total mass of the pellets (A), (B), and (C). The antistatic agent for polyolefin resins according to claim 1 or 2, wherein the ratio of free fatty acids to the total mass of the pellets (A), (B) and (C) is 5 mass% or less. For polyolefin resins,
Pellets (A) mainly composed of glycerin fatty acid esters;
Pellets containing alkyldiethanolamine as a main component (B),
and pellets (C) mainly composed of fatty acid esters of polyoxyethylene fatty amines.
The method comprises adding and mixing
A method for producing a polyolefin resin composition. Pellets made of a polyolefin resin;
Pellets (A) mainly composed of glycerin fatty acid esters;
Pellets containing alkyldiethanolamine as a main component (B),
and a pellet (C) mainly composed of a fatty acid ester of a polyoxyethylene aliphatic amine, to obtain a pellet mixture;
A step of heating and kneading the pellet mixture is included.
A method for producing a polyolefin resin composition.