Antistatic agent for polyolefin resin and method for producing polyolefin resin composition

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

[0001] The present invention relates to an antistatic agent for polyolefin resins and a method for producing a polyolefin resin composition.

Background Art

[0002] When producing a molded article by adding an antistatic agent to a thermoplastic resin such as a polyolefin resin, a masterbatch obtained by previously melt-mixing a part of the base resin with the antistatic agent and pelletizing it is generally used. By mixing a masterbatch containing a high concentration of an antistatic agent and resin pellets not containing an antistatic agent, the antistatic agent can be uniformly dispersed in the resin. However, the masterbatch has disadvantages such as high production costs and the resin physical properties of the molded article may sometimes deteriorate because the base resin of the masterbatch and the resin used for molding are not necessarily the same.

[0003] As a means for solving such problems, a method has been proposed in which an antistatic agent pelletized into the same shape as the masterbatch is used to simultaneously solve the handleability and cost reduction (see Patent Documents 1 and 2). Patent Document 1 discloses an antistatic agent granule mixture in which a fatty acid monoglyceride and N,N-bis(2-hydroxyethyl)alkylamine and / or N,N-bis(2-hydroxyethyl)fatty acid amide are separately granulated and mixed. Patent Document 2 discloses an antistatic agent for polyolefin resins obtained by pelletizing a mixture obtained by melt-mixing (A) a fatty acid monoester of polyoxyalkylene alkylamine and (B) a higher fatty acid at a mass ratio of component (A) / component (B) = 1 / 4 to 4 / 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] However, when the antistatic agent pellets are directly mixed with the polyolefin resin and molded, the antistatic agent may not be uniformly dispersed in the resin under normal kneading conditions, and sufficient effects may not be obtained. Further, as a result of the study by the present inventors, when the kneading time is lengthened or 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 generate fatty acids, which has been found to cause the odor of the molded product.

[0006] An object of the present invention is to provide an antistatic agent pellet for polyolefin resins and a method for producing a polyolefin resin composition using the same, which exhibit an antistatic effect equivalent to that of a masterbatch and do not generate an odor after molding of the polyolefin resin composition in order to solve such problems. MEANS FOR SOLVING THE PROBLEMS

[0007] As a result of intensive studies to achieve the above object, the present inventors have completed the present invention.

[0008] That is, the present invention is [1] Pellets (A) mainly composed of glycerin fatty acid ester, Pellets (B) mainly composed of alkyldiethanolamine, And pellets (C) mainly composed of a fatty acid ester of polyoxyethylene aliphatic amine An antistatic agent for polyolefin resins containing. [2] The antistatic agent for polyolefin resin according to [1], wherein 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 content of fatty acid ester of alkyldiethanolamine is 20 to 80% by mass with respect to the total mass of the pellets (A), pellets (B) and pellets (C). [3] The antistatic agent for polyolefin resin according to [1] or [2], wherein the proportion of free fatty acid is 5% by mass or less with respect to the total mass of the pellets (A), pellets (B) and pellets (C). [4] With respect to the polyolefin resin, 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 Are added, 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 pellets (C) mainly composed of fatty acid ester of polyoxyethylene aliphatic amine are dry blended to obtain a pellet mixture, And a step of heat-kneading the pellet mixture, A method for producing a polyolefin resin composition.

Advantages of the Invention

[0009] 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. In addition, it does not impair the transparency and slipperiness of polyolefin resin molded products, and no odor is generated.

Embodiments for Carrying Out the Invention

[0010] The antistatic agent for polyolefin resins of the present invention is characterized by containing pellet (A) mainly composed of glycerin fatty acid ester, pellet (B) mainly composed of alkyldiethanolamine, and pellet (C) mainly composed of fatty acid ester of polyoxyethylene aliphatic amine. Hereinafter, the configuration of the present invention will be described in detail.

[0011] In the present invention, pellet (A) is a pellet mainly composed of glycerin fatty acid ester.

[0012] Glycerin fatty acid ester is an ester compound obtained by a known method such as an esterification reaction of glycerin and fatty acid, or a transesterification reaction of glycerin and fatty acid lower alkyl alcohol ester, and is preferably a monoester and a diester obtained from glycerin and a fatty acid having 8 to 22 carbon atoms, but a triester may also be present. These may be distilled or used as they are without distillation.

[0013] Examples of the fatty acid 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 preferable from the viewpoints of antistatic property and bleeding property, and palmitic acid and stearic acid are particularly preferable.

[0014] Examples of the glycerin fatty acid ester include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, and glycerin monooleate.

[0015] 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, more preferably 90% by mass or more, particularly preferably 95% by mass or more, and may even be 99% by mass or more. The pellet (A) may contain components other than glycerin fatty acid ester as long as the effects of the present invention are not impaired. 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.

[0016] In the present invention, the pellet (B) is a pellet mainly composed of an alkyldiethanolamine represented by the following general formula (1). [Chemical formula] (In the formula, R 1 represents an alkyl group or alkenyl group having 8 to 22 carbon atoms.)

[0017] Examples of the alkyldiethanolamine include lauryldiethanolamine, myristyldiethanolamine, palmityldiethanolamine, and stearyldiethanolamine, and stearyldiethanolamine is particularly preferred.

[0018] 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, more preferably 90% by mass or more, particularly preferably 95% by mass or more, and may even be 99% by mass or more.

[0019] In the present invention, the pellet (C) is a pellet mainly composed of a fatty acid ester of polyoxyethylene aliphatic amine (hereinafter also referred to as "amine ester compound").

[0020] Examples of the amine ester compound include a monoester and a diester obtained from a polyoxyethylene aliphatic amine having a hydrocarbon group with 8 to 22 carbon atoms and a fatty acid with 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. [Chemical formula] (In the formula, R 2 represents an alkyl group or alkenyl group having 8 to 22 carbon atoms, R 3 represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, and p and q are the average number of moles of ethylene oxide added, and p + q represents a number such that p + q = 1 to 10.) It is a compound represented by

[0021] The amine ester compound can be obtained by reacting a polyoxyethylene alkylamine or polyoxyethylene alkenylamine, which can be obtained by adding 1 to 10 moles of ethylene oxide to 1 mole of an alkylamine or alkenylamine having 8 to 22 carbon atoms, with a saturated or unsaturated fatty acid having 8 to 22 carbon atoms. Examples of the polyoxyethylene alkylamine or polyoxyethylene alkenylamine include polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, and polyoxyethylene oleylamine. Among them, from the viewpoint of obtaining a good antistatic effect, amine compounds in which p and q in the general formula (2) satisfy p + q = 2 to 3 are preferred, and amine compounds with p + q = 2, specifically lauryldiethanolamine, myristyldiethanolamine, palmityldiethanolamine, stearyldiethanolamine, and oleyl diethanolamine are more preferred, and stearyldiethanolamine is particularly preferred. Examples of the saturated or unsaturated fatty acid 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.

[0022] Specific examples of the amine ester compound include, but are not limited to, lauryldiethanolamine monostearate, myristyldiethanolamine monooleate, palmitilydiethanolamine monostearate, stearyldiethanolamine monolaurate, stearyldiethanolamine monostearate, stearyldiethanolamine monooleate, stearyldiethanolamine monobehenate, oleoyldiethanolamine monostearate, etc. Also, there is no problem in using a mixture of two or more compounds represented by the general formula (2).

[0023] The method for producing the amine ester compound is not particularly limited, but examples include an esterification method in which a fatty acid charged in an amount of 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, or a method by transesterification with a fatty acid methyl ester. Note that these reaction products may contain unreacted polyoxyethylene alkylamine or polyoxyethylene alkenylamine.

[0024] In the present invention, "mainly composed of a 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 as long as the effects of the present invention are not impaired, 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.

[0025] Each pellet constituting the antistatic agent for polyolefin resins of the present invention is a granular material having an average particle size of usually 2 to 7 mm. From the viewpoints of handleability and uniform dispersion in the resin, it is preferably a pellet having an average particle size of 3 to 6 mm. In the present invention, the average particle size is a value obtained by dividing the sum of the average major axis and the average minor axis of the pellet by 2. The shape of the pellet may be one having a definite shape such as spherical, hemispherical, ellipsoidal, cuboid, cylindrical, strand-like, etc., or may be an irregular shape such as one made into chip shape by crushing or the like, or a flaky one, and its shape is not particularly limited.

[0026] As a method for pelletizing to obtain the pellet of the present invention, known techniques can be used. For example, a method of dropping a molten compound onto a cooling belt surface and granulating it into a hemispherical shape, a method of extruding it from a die into a noodle shape in a semi-molten state and granulating it into a cylindrical shape, etc. can be used. As an apparatus for pelletizing into a hemispherical shape, for example, a Rotofomer granulator manufactured by Sandvik can be mentioned.

[0027] The antistatic agent for polyolefin resins of the present invention contains the above-mentioned pellet (A), pellet (B), and pellet (C). From the viewpoint of the antistatic effect, the content of glycerin fatty acid ester with respect to the total mass of pellet (A), pellet (B), and pellet (C) is preferably 1 to 50% by mass, more preferably 5 to 40% by mass, still more preferably 10 to 30% by mass, the content of alkyldiethanolamine is preferably 10 to 50% by mass, more preferably 15 to 40% by mass, and the content of amine ester compound is preferably 20 to 80% by mass, more preferably 40 to 70% by mass. Also, from the viewpoint of reducing the odor after molding of the polyolefin resin composition, the ratio of free fatty acid with respect to the total mass of pellet (A), pellet (B), and pellet (C) is preferably 5% by mass or less, more preferably 3% by mass or less.

[0028] The polyolefin resin using the antistatic agent for polyolefin resins of the present invention is not particularly limited, and known ones 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 above α-olefins, copolymers of monomers other than α-olefins copolymerizable with the above 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 crosslinking ethylene-acrylic acid copolymer with metal ions, polybutene-1, butene-ethylene copolymer. These may be used alone or in combination of two or more.

[0029] Examples of monomers other than α-olefins copolymerizable with the above α-olefins include vinyl acetate, maleic acid, vinyl alcohol, methacrylic acid, methyl methacrylate, ethyl methacrylate, etc.

[0030] A polyolefin resin composition can be obtained by heating and kneading a polyolefin resin and the antistatic agent of the present invention. For heating and kneading, known mixers or extruders such as a Banbury mixer, Henschel mixer, tumbler mixer, single-screw extruder and multi-screw extruder can be used. Each pellet constituting the antistatic agent of the present invention may be added to the polyolefin resin separately, or can be added to the polyolefin resin after being pre-dry blended. Further, from the viewpoint of facilitating the dispersion of the antistatic agent component in the resin, suppressing the generation of fatty acids during heating and kneading, and reducing the odor of the molded product, it is preferable to pre-dry blend the resin pellets and the antistatic agent pellets before heating and kneading.

[0031] The content of the antistatic agent of the present invention contained in the polyolefin resin composition is not particularly limited, but 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 with respect to 100 parts by mass of the polyolefin resin. When within this range, a polyolefin resin molded article having particularly excellent antistatic properties can be provided.

[0032] In the polyolefin resin composition, various additives usually used in polyolefin resin compositions can be added within a range that does not impair the object of the present invention. Examples of the various additives include an anti-fogging agent, an antioxidant, a weathering agent, an ultraviolet absorber, a stabilizer, a slip agent, a tackifier, an anti-blocking agent, and the like.

[0033] The polyolefin resin composition can be formed into any molded article such as a film, a sheet, a bottle, a filament, an injection molded article, and the like.

[0034] Examples of the method for producing a polyolefin resin film formed by molding the polyolefin resin composition include the T-die method, the inflation method, the calendar method, etc. Among them, the T-die method of melt-kneading and extruding using a T-die is preferred. As an example of the manufacturing method of the T-die method, pellets of a polyolefin resin and pellets of the antistatic agent of the present invention are supplied to an extruder hopper, and 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-kneaded and extruded, and cooled by a cooling roll controlled at 20 to 40°C to obtain an unstretched sheet with a thickness of 100 to 500 μm. Co-extrusion methods or multi-layer formation by lamination with other films can also be used for the purpose of imparting strength and other functions to the film.

[0035] As a biaxial stretching method for the unstretched sheet, either a simultaneous biaxial stretching method by the tenter method or a sequential biaxial stretching method by rolls and a tenter may be used. As a representative example of simultaneous biaxial stretching, the unstretched sheet obtained as described above is stretched 9 to 16 times in surface magnification with a tenter at a preheating / stretching temperature of 70 to 90°C and a heat setting temperature of 100 to 150°C to obtain a film. Further, as a representative example of sequential biaxial stretching, the unstretched sheet is stretched in the longitudinal direction at a roll surface temperature of 50 to 80°C and a stretching magnification of 1.5 to 5 times by the rotation speed ratio of the drive rolls, and subsequently continuously stretched in the transverse direction under the conditions of a stretching temperature of 50 to 90°C, a stretching magnification of 1.5 to 8 times, and a heat setting temperature of 100 to 150°C to obtain a film.

[0036] The thickness of the polyolefin-based film is not particularly limited and may be appropriately set according to the use, required performance, price, etc. Generally, a thickness of about 10 to 100 μm can be exemplified. Further, for the purpose of improving the printability, laminating property, coating suitability, etc. of the film, surface treatment may be performed. Examples of the surface treatment method include corona discharge treatment, plasma treatment, acid treatment, etc., and any of these methods can be used. Among these, corona discharge treatment can be exemplified as the most preferable from the viewpoint of simplicity.

Examples

[0037] The present invention will be described in more detail based on examples below, but the present invention is not limited thereto. Unless otherwise specified, the blending amounts are shown in parts by mass.

[0038] In this example, the measurement of the average particle diameter of the pellets and the amount of free fatty acid in the antistatic agent pellets was performed by the following method. <Average particle diameter of pellets> The major axis and minor axis of 10 or more pellets are measured with calipers, and the respective average values are taken as the average major axis or average minor axis of the pellets. The value obtained by dividing the sum of the calculated average major axis and average minor axis by 2 is taken as the number average particle diameter of the pellets.

[0039] <Method for measuring amount of free fatty acid> A sufficient amount of the mixture of the antistatic agent pellets was collected and dissolved so that the ratio of each component in the measurement sample would not deviate from the mixing ratio of the pellets (A) to (C), and then it was promptly subjected to gas chromatography measurement. The gas chromatography was measured using GC-2010 Plus (manufactured by Shimadzu Corporation) under the following conditions. (Measurement conditions) Capillary column: CP-Sil 8 CB for Amines (manufactured by J&W Scientific), Mobile phase: helium, internal column flow rate: 1.0 mL / min, temperature rising program: hold at 100°C for 1 minute → 100 to 320°C (rising at 10°C / min) → hold at 320°C for 10 minutes, equilibration time: 1 minute, 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

[0040] <Method for manufacturing antistatic agent pellets> (Example 1) Glycerin monostearate (a-1) was charged into the blending tank, heated to 80°C until liquefied, and then granulated into hemispherical pellets with an average particle size of 4 mm using a rotor former granulation facility to obtain antistatic agent pellets (A-1). Similarly, stearyldiethanolamine (b-1) and stearyldiethanolamine monostearate (c-1) were each 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.

[0041] (Example 2) Each pellet obtained in Example 1 was 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.

[0042] (Example 3) Similarly, glycerin monopalmitate (a-2), palmityldiethanolamine (b-2), and palmityldiethanolamine monostearate (c-2) were each heated and melted, granulated using a rotor-former granulation facility, and pellets (A-2), pellets (B-2), and pellets (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.

[0043] (Example 4) Each pellet obtained in Example 3 was 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.

[0044] (Comparative Example 1) Stearyldiethanolamine monostearate (c-1) and stearic acid were melt-mixed at a mass ratio of 50 / 50, and hemispherical pellets with an average particle size of 4 mm were granulated using a rotor-former granulation facility to obtain mixture pellets 1.

[0045] (Comparative Example 2) Palmityldiethanolamine monostearate (c-2) and palmitic acid were melt-mixed at a mass ratio of 50 / 50, and hemispherical pellets with an average particle size of 4 mm were granulated using a rotor-former granulation facility to obtain mixture pellets 2.

[0046] (Comparative Example 3) Stearyldiethanolamine monostearate (c-1) and stearic acid were melt-mixed at a mass ratio of 60 / 40, and hemispherical pellets with an average particle size of 4 mm were granulated using a rotor-former granulation facility to obtain mixture pellets 3. The pellet (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.

[0047] (Comparative Example 4) Palmitildietanolamine monostearate (c-2) and palmitic acid were melt-mixed at a mass ratio of 60 / 40, and hemispherical pellets with an average particle size of 4 mm were granulated using a rotor-former granulation facility to obtain mixture pellets 4. 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.

[0048] (Comparative Example 5) The pellets (A-1) and pellets (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.

[0049] (Comparative Example 6) The pellets (A-2) and pellets (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.

[0050] (Comparative Example 7) Glycerin monostearate, stearyldiethanolamine, and stearyldiethanolamine monostearate were melt-mixed at a mass ratio of 30 / 20 / 50, and hemispherical pellets with an average particle size of 4 mm were granulated using a rotor-former granulation facility to obtain mixture pellets 5.

[0051] ><Method for manufacturing a film> The antistatic agent pellets were mixed at a ratio 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 mixing was performed by dry blending by adding to a polyethylene bag and shaking by hand. Subsequently, a mixture of the antistatic agent pellets and the resin pellets was supplied to an extruder, and an unstretched film (CPP) was produced by the T-die method. After storing the produced film in a thermostatic chamber at a temperature of 25°C and a humidity of 50% for 1 day or 14 days, the antistatic property (surface resistivity) and the antifogging property were evaluated according to the following criteria. Also, after storing the formed film under the above conditions for 14 days, the slipperiness (coefficient of friction) and the transparency (HAZE) were evaluated according to the following criteria. Further, after storing the formed 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.

[0052] (1) Antistatic property (surface resistivity) Using a high-resistance insulation tester (manufactured by Mitsubishi Chemical Analytech Co., Ltd., High Resista UP MCPHT450), the film was sandwiched between the main electrode and the counter electrode in an atmosphere of 25°C and 50% RH, and the surface resistivity was measured at an applied voltage of 500 V according to JIS-K-6911.

[0053] (2) Antifogging property 100 ml of water was put into a 200 ml beaker, and the produced film was placed on the beaker and fixed with a rubber band, and stored in a thermostat (5°C) for 30 minutes. Then, a piece of paper with characters written on it was placed under the beaker, and it was observed how clearly the characters placed under the film could be seen. 5: The wetted area on the film surface is 95% or more, and the characters below can be clearly seen. 4: The wetted area on the film surface is 50% or more and less than 95%, and the characters below can be read. 3: The wetted area on the film surface is 30% or more and less than 50%, and the characters below look blurred. 2: The wetted area on the film surface is 10% or more and less than 30%, and the characters below look blurred. 1: The wetted area on the film surface is 0% or more and less than 10%, and the characters cannot be seen.

[0054] (3) Odor Fifty sheets of the film cut to 30 cm in length and 30 cm in width were sealed in a polyethylene bag, stored at 80 °C for 24 hours, and then the odor of the internal air was evaluated by sensory evaluation. The odor index was judged according to the following five-level criteria, and the median value of 10 participants in the odor confirmation was calculated as the evaluation result. 5: There is a slight odor, but no unpleasant odor. 4: There is an odor, but no unpleasant odor. 3: There is an odor and it feels slightly unpleasant. 2: There is an odor and it feels unpleasant. 1: The odor is strong and it feels very unpleasant.

[0055] (4) Transparency (haze) In accordance with JIS K7105, 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).

[0056] (5) Slip property (coefficient of friction) The slip property was evaluated by the value of the dynamic coefficient of friction shown below. The dynamic coefficient of friction (μd) of the film after production was measured using a friction measuring machine TR-2 (manufactured by Toyo Seiki) in accordance with JIS K7125-ISO 8295 (Plastics - Films and Sheets - Test Method for Coefficient of Friction). The measurement conditions are a temperature and humidity of 20 °C × 45% R.H.

[0057]

Table 1

[0058] From the results of the examples, the polypropylene resin compositions of Examples 1 to 4 containing the antistatic agent of the present invention were all excellent in all evaluation items. On the other hand, in the mixture pellets of Comparative Examples 1 to 4, antistatic properties and antifogging properties could not be obtained, and there was a strong odor due to the incorporation of a large amount of fatty acids. Further, in the antistatic agents of Comparative Examples 5 and 6 in which no amine ester-based compound was incorporated, the antistatic properties and antifogging properties were inferior. In Comparative Example 7, the initial antistatic properties and antifogging properties were inferior. Also, there was an odor derived from fatty acids generated during melt mixing.

Claims

1. Pellets (A) mainly composed of glycerin fatty acid ester, Pellets (B) mainly composed of alkyldiethanolamine, And pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amine A static electricity preventing agent for polyolefin resins, comprising the same.

2. The content of glycerin fatty acid ester with respect to the total mass of the pellets (A), pellets (B) and pellets (C) is 1 to 50% by mass, the content of alkyldiethanolamine is 10 to 50% by mass, and the content of fatty acid esters of alkyldiethanolamine is 20 to 80% by mass. The static electricity preventing agent for polyolefin resins according to Claim 1.

3. The ratio of free fatty acids with respect to the total mass of the pellets (A), pellets (B) and pellets (C) is 5% by mass or less. The static electricity preventing agent for polyolefin resins according to Claim 1 or 2.

4. With respect to polyolefin resins, Pellets (A) mainly composed of glycerin fatty acid ester, Pellets (B) mainly composed of alkyldiethanolamine, And pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amine Are added and mixed, A method for producing a polyolefin resin composition, characterized by this.

5. Pellets made of polyolefin resin, Pellets (A) mainly composed of glycerin fatty acid ester, Pellets (B) mainly composed of alkyldiethanolamine, And pellets (C) mainly composed of fatty acid esters of polyoxyethylene aliphatic amine are dry-blended to obtain a pellet mixture, A method for producing a polyolefin resin composition, comprising a step of heat-kneading the pellet mixture. ​

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