Resin-use additive

Abstract

[Problem] To provide a resin-use additive which includes a glycerin fatty acid ester and in which smoke generation and occurrence of scattering are suppressed during molding processing even if the resin-use additive is transported / stored in a molten state. [Solution] This resin-use additive contains a glycerin fatty acid ester comprising an ester of glycerin and a fatty acid having 12-24 carbon atoms, wherein the glycerin fatty acid ester has a melting point of 45-60°C.

Description

Additive for Resin

[0001] The present invention relates to an additive for resins to be added to polyolefin resin compositions and the like. Specifically, it relates to an additive for resins suitable for obtaining a resin composition that suppresses smoke generation during molding even when transported and stored in a molten state and is excellent in antistatic properties and antifogging properties, and a polyolefin resin composition containing the additive for resins.

[0002] Conventionally, glycerin fatty acid esters have been widely used as antistatic agents and antifogging agents for resins such as polyolefins. Since glycerin fatty acid esters are solids at room temperature, they are usually heated and melted after being delivered to manufacturers of resin processed products and the like for use. Also, in transactions with said manufacturers, glycerin fatty acid esters are often formed into pellets and packed in bags or filled into drum containers so as to be melted and easy to use during use. For example, Patent Document 1 discloses an antistatic agent granule mixture obtained by mixing granule A containing a fatty acid monoglyceride as a main component and granule B containing N,N-bis(2-hydroxyethyl)alkylamine or N,N-bis(2-hydroxyethyl)fatty acid amide as a main component. Patent Document 2 also discloses that pellets of a molten mixture of a fatty acid ester of polyoxyalkyleneamine and a higher fatty acid and pellets of a fatty acid monoglyceride are used by dry blending.

[0003] However, due to the above circumstances, when using glycerin fatty acid esters, large-scale melting devices for melting glycerin fatty acid esters are required for large-scale manufacturers, the burden of the melting operation is large, or alternatively, a large amount of waste containers may be generated after delivery and use, which may pose problems.

[0004] Japanese Patent No. 2876183, Japanese Unexamined Patent Application Publication No. 2002-179849

[0005] As mentioned above, resin additives that are solid at room temperature require heating and melting during use, resulting in significant energy loss. Therefore, improvements are needed from a cost and energy consumption perspective. One possible solution to this problem is to transport the resin additives in a molten state in heated tank trucks, and then receive and store them directly in tanks. However, this method can be problematic depending on the type of resin additive. For example, glycerin fatty acid esters are often blended with amine-amide surfactants. When these are mixed and stored in a molten state, the heat required to melt them (e.g., around 80°C) easily triggers a transesterification reaction, releasing glycerin from the glycerin fatty acid ester. This released material can scatter due to the heat generated during molding, potentially worsening the working environment due to the generation of such scatters (smoke). Therefore, transporting and storing resin additives containing glycerin fatty acid esters in a molten state is only feasible under extremely limited conditions, such as when a large quantity of the resin additive can be used up within a very short period, for example, about a week. However, to date, no technology has been established that enables the long-term transportation or storage of resin additives containing glycerin fatty acid esters in a molten state.

[0006] The present invention provides a resin additive containing a glycerin fatty acid ester that suppresses the generation of splatter and smoke during molding, even when transported and stored in a molten state.

[0007] The present invention relates to the following [1] to [6]. [1] A resin additive comprising a glycerin fatty acid ester, which is an ester of a fatty acid having 12 to 24 carbon atoms and glycerin, wherein the glycerin fatty acid ester has a melting point of 45°C or more and 60°C or less. [2] The resin additive according to [1], further comprising one or more amine-amide surfactants selected from the group consisting of aliphatic diethanolamine, fatty acid esters of polyoxyethylene aliphatic amine, fatty acid diethanolamide, and fatty acid monoesters of fatty acid diethanolamide. [3] The resin additive according to [2], wherein the complete melting temperature of the resin additive is less than 55°C. [4] The resin additive according to [2], wherein the glycerin fatty acid ester and the amine-amide surfactant are in a mass ratio of the ester:surfactant = 5:95 to 60:40. [5] A polyolefin resin composition comprising the resin additive according to any one of [1] to [6]. [6] The polyolefin resin composition according to [5], comprising the resin additive in an amount of 0.05 to 1.90% by mass with respect to the total mass of the polyolefin resin composition.

[0008] According to the present invention, it is possible to provide a resin additive containing a glycerin fatty acid ester that can be transported and stored for long periods of time in a molten state, and in particular a resin additive containing a glycerin fatty acid ester and an amine-amide surfactant. Furthermore, according to the present invention, it is possible to provide a resin additive containing a glycerin fatty acid ester that suppresses the generation of scattering and smoke during molding, even when transported and stored for long periods of time in a molten state.

[0009] The inventors focused on the melting point of glycerin fatty acid esters. As described later, glycerin fatty acid esters can take the form of mono / di / tryesters depending on the degree of esterification, and generally exist as mixtures of these. The inventors found that by setting the melting point of the glycerin fatty acid ester in this mixture form to a lower form than conventional products, that is, by keeping the glycerin fatty acid ester in a fluid liquid form at temperatures around 50°C, the monoester (melting point approximately 70°C), which is prone to precipitation, can be stored for a long period of time without crystallization. Furthermore, they found that a mixture of this ester and an amine / amide surfactant (melting point 25-48°C) can also be stored in a fluid liquid form under the aforementioned mild temperature conditions. As storage is possible at lower temperatures than before, transesterification reactions during storage are suppressed, and even after long-term storage and transportation in a molten state, smoke generation during molding of molded products containing this ester can be reduced.

[0010] Thus, according to the present invention, the problem that arises when resin additives, which are solid at room temperature, are transported and stored in a molten state, is solved, leading to deterioration and liberation of additive components and subsequent smoke generation during molding. It is also expected that this invention will improve the working environment during molding processes due to smoke generation and suppress contamination of manufacturing equipment and the molded products themselves by smoke components. The present invention will be described in detail below.

[0011] [Additives for Resins] The resin additive of the present invention contains a glycerin fatty acid ester having a melting point of 45°C to 60°C, and may further contain an amine-amide surfactant as described later. The above-mentioned glycerin fatty acid ester and amine-amide surfactant are components that impart antistatic and anti-fogging properties when they are blended into polyolefin resins and the like as resin additives.

[0012] [Glycerin Fatty Acid Ester] The glycerin fatty acid ester according to the present invention consists of an ester of a fatty acid having 12 to 24 carbon atoms and glycerin. The glycerin fatty acid ester according to the present invention is characterized by having a melting point of 45°C or higher and 60°C or lower. The glycerin fatty acid ester having the above melting point range can be stored in a molten state under relatively milder temperature conditions than conventional methods, and because it is under mild temperature conditions, transesterification reactions that may occur when combined with amine-amide surfactants, etc., as described later, are also suppressed. Consequently, when processing molded products containing resin additives, smoke generation due to the release, scattering, decomposition, vaporization, etc., of additive components can be suppressed.

[0013] In this invention, the melting point of the glycerin fatty acid ester is determined by a value measured using an automated melting point analyzer. For example, a melting point analyzer (M-565, manufactured by Nippon Buch Co., Ltd.) is used to raise the temperature from 40°C to the end of melting at a rate of 1°C / min, and the melting behavior and the end of melting (melting point) are observed from the change in the image. As described above, the melting point of the glycerin fatty acid ester according to this invention is between 45°C and 60°C, for example, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, and 60°C.

[0014] The esters formed from the above-mentioned fatty acids with glycerol, a trihydric alcohol, take the forms of glycerol fatty acid monoesters, glycerol fatty acid diesters, and glycerol fatty acid triesters, depending on the degree of esterification.

[0015] Examples of fatty acids having 12 to 24 carbon atoms include saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid; monounsaturated fatty acids such as palmitoleic acid and oleic acid; and polyunsaturated fatty acids such as linoleic acid and linolenic acid. Among the fatty acids having 12 to 24 carbon atoms, fatty acids having 14 to 18 carbon atoms are preferably used, and saturated fatty acids are also preferably used.

[0016] In the above glycerol fatty acid ester, only one type of fatty acid may be used, or two or more types may be used in combination. For example, the above glycerol fatty acid diester may be an ester compound of glycerol and two different fatty acids, and the above glycerol fatty acid triester may be an ester compound of glycerol and two or more different fatty acids. Furthermore, the above glycerol fatty acid ester may be a mixture of two or more glycerol fatty acid esters. In this case, the melting point of one of the glycerol fatty acid esters does not have to be between 45°C and 60°C; that is, the melting point of the mixture may be within the above numerical range. Esterilized products using mixed fatty acids containing two or more fatty acids tend to have lower melting points than esterified products using one type of fatty acid. Also, esterified products using an unsaturated fatty acid as at least one of the two or more fatty acids, and mixtures of saturated fatty acid ester compounds and unsaturated fatty acid esterified products also tend to have lower melting points. For example, two saturated fatty acids with 16 to 18 carbon atoms can be used in combination.

[0017] Furthermore, while investigating the melting point of glycerol fatty acid esters, the inventors discovered for the first time that the melting point of the ester (mixture) can be lowered not only by adjusting the type of fatty acid, but also by adjusting the ratio of mono / di / tryesters that constitute the ester. For example, in a preferred embodiment of the present invention, by including a certain amount of diester and triester, the melting point of the ester mixture can be made lower compared to conventional methods.

[0018] In other words, in one embodiment, the glycerin fatty acid ester according to the present invention may contain 0 to 45% by mass of glycerin fatty acid monoester, 10 to 60% by mass of glycerin fatty acid diester, and 10 to 90% by mass of glycerin fatty acid triester (total of monoester, diester, and triester: 100% by mass). As one means of using the glycerin fatty acid ester in the present invention, by keeping the proportion of each ester within the above numerical range, the melting point of the ester is lowered, enabling storage under lower temperature conditions than conventional methods, and providing sufficient antistatic and anti-fogging properties to films to which it is added, as well as suppressing smoke generation during the manufacturing (molding) of films to which it is formulated. In one embodiment, the glycerin fatty acid ester may contain 5 to 30% by mass of glycerin fatty acid monoester, for example, 8 to 15% by mass, 20 to 60% by mass of glycerin fatty acid diester, for example, 30 to 55% by mass, and 20 to 60% by mass of glycerin fatty acid triester, for example, 30 to 45% by mass.

[0019] [Amine-amide surfactants] The resin additive according to the present invention may include one or more amine-amide surfactants selected from the group consisting of aliphatic diethanolamine, fatty acid esters of polyoxyethylene aliphatic amine, fatty acid diethanolamide, and fatty acid monoesters of fatty acid diethanolamide.

[0020] <Aliphatic Diethanolamines> Examples of aliphatic diethanolamines include compounds represented by the following formula (1). In formula (1), R １ The symbol represents an alkyl or alkenyl group having 8 to 22 carbon atoms. Specific examples of the above aliphatic diethanolamines include lauryl diethanolamine, myristyl diethanolamine, palmityl diethanolamine, stearyl diethanolamine, oleyl diethanolamine, and others, with stearyl diethanolamine and oleyl diethanolamine being particularly preferred. These may be used individually or in combination of two or more.

[0021] <Fatty Acid Esters of Polyoxyethylene Aliphatic Amines> Fatty acid esters of polyoxyethylene aliphatic amines include monoesters and diesters obtained by reacting a saturated or unsaturated fatty acid with a polyoxyethylene alkylamine or polyoxyethylene alkenylamine. Examples of the above polyoxyethylene alkylamine or polyoxyethylene alkenylamine include polyoxyethylene laurylamine, polyoxyethylene myristylamine, polyoxyethylene palmitylamine, polyoxyethylene stearylamine, and polyoxyethylene oleylamine. Examples of the above fatty acids include saturated or unsaturated fatty acids having 8 to 22 carbon atoms, such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, and behenic acid. Among these, monoesters represented by the following formula (2) are preferred from the viewpoint of obtaining a good antistatic effect. In formula (2), R ２ R represents an alkyl or alkenyl group having 8 to 22 carbon atoms. ３ represents an alkyl or alkenyl group having 7 to 21 carbon atoms, and m and n are integers of 1 or more, such that m + n = 2 to 5. In particular, from the viewpoint of obtaining a good antistatic effect, it is preferable that m and n in formula (2) are m + n = 2 to 3. More specific examples of the fatty acid esters of the above polyoxyethylene aliphatic amine 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, oleyl diethanolamine monostearate, etc. Among these, stearyl diethanolamine monostearate and oleyl diethanolamine monolaurate are particularly preferred. Furthermore, these may be used individually or in combination of two or more.

[0022] <Fatty Acid Diethanolamide> Examples of fatty acid diethanolamides include compounds represented by the following formula (3). In formula (3), R ４ The group represents an alkyl or alkenyl group having 7 to 21 carbon atoms. Specific examples of the above fatty acid diethanolamides include, for example, coconut fatty acid diethanolamide, lauric acid diethanolamide, myristic acid diethanolamide, tridecyl acid diethanolamide, pentadecyl acid diethanolamide, palmitic acid diethanolamide, heptadecyl acid diethanolamide, stearic acid diethanolamide, oleic acid diethanolamide, nonadecanoic acid diethanolamide, and arachidic acid diethanolamide. Among these, stearic acid diethanolamide and oleic acid diethanolamide are preferred from the viewpoint of antistatic and anti-fogging properties. Fatty acid diethanolamides can be used individually or in combination of two or more types.

[0023] <Fatty Acid Monoesters of Fatty Acid Diethanolamides> Fatty acid monoesters of fatty acid diethanolamides include fatty acid monoesters of the amide compounds listed above in <Fatty Acid Diethanolamides>. Examples of the above fatty acids include saturated or unsaturated fatty acids having 8 to 22 carbon atoms, such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, and behenic acid. Examples of fatty acid monoesters of fatty acid diethanolamides include compounds represented by the following formula (4). In formula (4), R ５ R represents an alkyl or alkenyl group having 7 to 21 carbon atoms. ６ This represents an alkyl or alkenyl group having 7 to 21 carbon atoms.

[0024] When the resin additive according to the present invention contains an amine-amide surfactant, the blending ratio (mass ratio) of the glycerin fatty acid ester and the amine-amide surfactant can be, from the viewpoint of antistatic properties and antifogging properties, for example, the ester:surfactant = 1:99 to 99:1, 1:99 to 80:20, 5:95 to 70:30, or 5:95 to 60:40, or for example, 10:90 to 50:50, 15:85 to 40:60, etc.

[0025] When the resin additive according to the present invention is in the form of a mixture of the glycerin fatty acid ester and the amine-amide surfactant, the melting point of the resin additive can be measured by a melting test using an oven. For example, a sample (10 g) is placed in an oven (at atmospheric pressure (no pressurization or depressurization), in an air atmosphere), acclimatized for about an hour, and then the temperature is increased by 1°C at a time while visually checking the state of the sample from outside the oven. The temperature at which the area around the sample begins to melt can be observed as the lower limit of the melting point (melting start temperature), and the temperature at which it is completely melted can be observed as the upper limit of the melting point (complete melting temperature). In the case of the resin additive (mixture) according to the present invention, for example, the complete melting temperature can be less than 55°C and the melting start temperature can be less than 52°C.

[0026] The viscosity of the resin additive (mixture) according to the present invention is, considering its actual use, lower than the viscosity that can be transported by tank truck (6,000 mPa·s), and is even lower when considering transfer by piping. For example, the viscosity of the resin additive according to the present invention can be 100 mPa·s or less at around 40°C to 60°C, and 60 mPa·s or less at, for example, 45°C to 55°C. It is not essential that the viscosity is below the set value throughout the entire temperature range, but for example, it can be 100 mPa·s or less or 60 mPa·s or less at 52°C.

[0027] [Other Additives] The resin additive according to the present invention may contain various commonly used additives, as long as they do not impair the scope of the present invention. Examples of such additives include antifogging agents, antioxidants, weather-resistant agents, ultraviolet absorbers, stabilizers, slip agents, tackifiers, and antiblocking agents.

[0028] [Polyolefin Resin Composition] The resin additive according to the present invention is particularly useful as an additive that imparts antistatic and anti-fogging properties to polyolefin resins, and a polyolefin resin composition containing the resin additive and a polyolefin resin is also subject to the present invention. The resin component (polyolefin resin) constituting the polyolefin resin composition is not particularly limited and includes, for example, homopolymers of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, and 4-methyl-1-pentene, copolymers of the α-olefins, copolymers of α-olefins with monomers other than α-olefins that can copolymerize with the α-olefins, and mixtures thereof. Examples of monomers other than α-olefins that can copolymerize with the α-olefins include vinyl acetate, maleic acid, vinyl alcohol, methacrylic acid, methyl methacrylate, and ethyl methacrylate. Specific examples include homopolymers of α-olefins such as low-density polyethylene, high-density polyethylene, polypropylene, and polybutene-1; copolymers of α-olefins such as ethylene-propylene copolymer, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, propylene-ethylene-butene-1 copolymer, and ethylene-propylene-butene-1 copolymer; ethylene-acrylic acid copolymer, ionomers obtained by crosslinking ethylene-acrylic acid copolymer with metal ions, and ethylene-vinyl acetate copolymer. These may be used individually or in combination of two or more types. These resins are appropriately selected from resins produced from appropriate starting materials such as petroleum-derived, biomass-derived, material-recycled, and chemical-recycled materials.

[0029] In a polyolefin resin composition, the amount of the resin additive according to the present invention can be, for example, 0.05 to 1.90% by mass, based on the total mass of the resin composition. Furthermore, based on the total mass of the polyolefin resin composition, the glycerin fatty acid ester can be blended in an amount of 0.05 to 0.40% by mass, preferably 0.10 to 0.35% by mass. The amine-amide surfactant can also be blended in an amount of 0.10 to 1.50% by mass, preferably 0.30 to 1.00% by mass.

[0030] Furthermore, the polyolefin resin composition according to the present invention may contain various additives commonly used in polyolefin resin compositions, in addition to the resin additives of the present invention, as long as they do not impair the objectives of the present invention. Examples of such additives include, as mentioned above, anti-fogging agents, antioxidants, weather-resistant agents, ultraviolet absorbers, stabilizers, slip agents, tackifiers, and anti-blocking agents.

[0031] The polyolefin resin composition according to the present invention can be manufactured by known methods. For example, the polyolefin resin composition can be obtained by first heating and kneading the polyolefin resin, the resin additive, and optionally other components using a known mixer or extruder such as a Banbury mixer, Henschel mixer, tumbler mixer, single-screw extruder, or multi-screw extruder. When other components are used, the resin additive and the other components may be added to the polyolefin resin separately, or they may be mixed beforehand before being added to the polyolefin resin. If the amount of resin additive (and other components) added is insufficient relative to the amount of polyolefin resin, it may be difficult to disperse them uniformly in the resin. Therefore, a masterbatch method may be employed in which a masterbatch containing a high concentration of resin additive, etc., is prepared in advance and kneaded with a polyolefin resin that does not contain resin additive, etc., to obtain a predetermined content.

[0032] The aforementioned polyolefin resin composition can be molded into any type of molded body, such as films, sheets, bottles, filaments, and injection-molded products.

[0033] For example, one embodiment of a molded article is a film formed by molding the polyolefin resin composition. This film is suitably used as packaging material for various items such as food, daily necessities, and parts. The film can be used as a single film or as a laminated film (laminated film) formed by laminating two or more films. The laminated film can be obtained by a solvent-type dry lamination method using a solvent to dilute the adhesive, or by processing with a solvent-free adhesive.

[0034] The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.

[0035] <Compounds Used> [Glycerin Fatty Acid Esters] Glycerin fatty acid esters having the ester ratios shown in Table 1 (total 100% by mass) were used. [Amine / Amide-based surfactants] ・SA-300F: Ester of stearyldiethanolamine and stearic acid (Trade name: Anstex® SA-300F (manufactured by Toho Chemical Industry Co., Ltd.)) ・SA-20: Stearyldiethanolamine (Trade name: Anstex® SA-20 (manufactured by Toho Chemical Industry Co., Ltd.)) ・C18-DEAd: Stearic acid diethanolamide (Trade name: Anstex® MY-21 (manufactured by Toho Chemical Industry Co., Ltd.))

[0036] The resin additives for Examples 1 to 9 and Comparative Examples 1 to 4 were prepared by blending glycerin fatty acid ester and amine / amide surfactant in the proportions (mass ratios) shown in Table 2. In the following description, the example numbers for the resin additives will also be used as example numbers for the evaluation of the glycerin fatty acid ester used in the resin additive, and for various evaluations of the film containing the resin additive.

[0037] [Melting Point Measurement] The melting points of the glycerin fatty acid esters used in the resin additives of Examples 1 to 9 and Comparative Examples 1 to 4, as well as the melting points and viscosities of the resin additives, were measured by the following procedure. For samples that were solid at room temperature, they were melted once, sucked into a capillary, and the solidified samples were used for melting point measurement. The results obtained are shown in Table 2. 〈Automatic Melting Point Apparatus: Glycerin Fatty Acid Ester〉 For the melting point measurement using an automatic melting point apparatus, a melting point measuring device (manufactured by Nippon Büchi Co., Ltd., model number: M-565) was used. The temperature was raised at a rate of 1 °C / min from 40 °C until the end of melting, and the end of melting was judged as the melting point from the change amount of the image (n = 2). 〈Oven: Resin Additive (Mixture of Glycerin Fatty Acid Ester and Amine / Amide Surfactant)〉 For the melting point measurement using an oven, the target sample (10 g) was placed in an oven (without pressure, air atmosphere), allowed to acclimatize for about 1 hour, and then the temperature was raised by 1 °C at a time while visually checking the state of the sample from outside the oven. The temperature at which the surroundings of the sample began to melt was taken as the lower limit of the melting point (melting start temperature), and the temperature at which it was completely melted was taken as the upper limit of the melting point (complete melting temperature).

[0038] [Viscosity Measurement: Resin Additive] Viscosity measurement was carried out using a viscoelasticity measuring device (manufactured by Anton Paar Japan Co., Ltd., model number: MCR-302) at a temperature of 45 °C to 52 °C (see Table 2), a rotational speed of 5 rpm, and a temperature decrease rate of 5 °C / min (n = 2).

[0039] [Polyolefin Resin Composition and Film] Hereinafter, polyolefin resin compositions containing the resin additives of Examples 1 to 9 were prepared, and the films molded from the compositions were evaluated. When preparing the polyolefin resin composition, the resin additive stored in a molten state for a certain period was used in consideration of actual use.

[0040] <Example 1> As the polyolefin resin, 100 parts of a homopolypropylene resin with a melt flow rate of 3.0 g / 10 min and 1.0 part of an additive for resin stored at 52°C for 14 days were mixed in a Henschel mixer, and then melt-kneaded using a twin-screw extruder equipped with a pelletizer to obtain a pelletized polypropylene resin composition. A film with a thickness of 30 μm was obtained by T-die molding from the obtained polypropylene resin composition. The antistatic property of the obtained film was evaluated, and the smoke generation property during film molding was evaluated according to the following procedure. The obtained results are shown in Table 2.

[0041] <Examples 2 to 9> In Example 1 above, films were produced and evaluated in the same manner as in Example 1, except that the type and blending amount of the additive for resin supplied to the extruder were as described in Table 2, respectively. The obtained results are shown in Table 2.

[0042] [Various evaluations] (1) Antistatic property After film formation, aging was performed at 45°C for 24 hours to obtain a film for measurement. Using a high-resistance insulation tester (manufactured by Nitto Seiko Analytic Co., Ltd. (former: Mitsubishi Chemical Analytic), Hirester (registered trademark) UPMCP-HT450), the film for measurement was sandwiched between the main electrode and the counter electrode, and the surface resistivity [LogΩ / □] was measured at an applied voltage of 500 V in an atmosphere of 25°C and 50% RH according to JIS-K-6911. If the surface resistivity [LogΩ / □] is less than 13 (less than 10 １３ (Ω / □)), it can be evaluated that it has excellent antistatic performance. (2) Smoke suppression during film molding The smoke generation state from the T-die during film molding was visually observed. 〇... Almost no smoke can be confirmed. ×... Smoke is confirmed

[0043]

[0044] As shown in Table 2, the resin additives of Examples 1 to 9, which contain glycerin fatty acid esters with melting points in the range of 45°C to 60°C, exhibited good antistatic performance in polyolefin films obtained by incorporating them after being stored at 52°C for 14 days, and no smoke was observed during film manufacturing. In other words, these resin additives of Examples were found to exhibit antistatic performance even after being stored in a molten state, and the generation of scattered material and smoke during molding were suppressed. Although the evaluation of polyolefin resin compositions and films incorporating resin additives of Comparative Examples 1 to 4, which contain glycerin fatty acid esters with melting points exceeding 60°C, was considered, these resin additives could not be stored in liquid form at 52°C, and therefore could not be evaluated.

Claims

1. A resin additive comprising a glycerin fatty acid ester, which is an ester of a fatty acid having 12 to 24 carbon atoms and glycerin, wherein the glycerin fatty acid ester has a melting point of 45°C or higher and 60°C or lower.

2. The resin additive according to claim 1, further comprising one or more amine / amide surfactants selected from the group consisting of aliphatic diethanolamine, fatty acid esters of polyoxyethylene aliphatic amine, fatty acid diethanolamide, and fatty acid monoesters of fatty acid diethanolamide.

3. The resin additive according to claim 2, wherein the complete melting temperature of the resin additive is less than 55°C.

4. The resin additive according to claim 2, wherein the glycerin fatty acid ester and the amine / amide surfactant are in a mass ratio of the ester:surfactant = 5:95 to 60:

40.

5. A polyolefin resin composition comprising the resin additive described in any one of claims 1 to 4.

6. The polyolefin resin composition according to claim 5, comprising 0.05 to 1.90% by mass of the resin additive based on the total mass of the polyolefin resin composition.

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