Resin composition, method for producing resin product, and flame retardant masterbatch

Abstract

The present invention provides a technology that is ideal for increasing the degree of freedom of composition for flame-resistant resin products. The resin composition according to the present invention contains a thermoplastic resin (A), a phosphorus flame retardant (B), and an acid-modified polyolefin resin (C). The ratio of phosphorus flame retardant (B) is 70 mass% or greater.

Description

Resin composition, method for producing resin product, and flame retardant masterbatch 【0001】 The present invention relates to a resin composition, a method for producing a resin product, and a flame retardant masterbatch. 【0002】 Polyolefin resins have excellent mechanical properties (such as bending properties and tensile properties), chemical resistance, and moldability, and are low in specific gravity and inexpensive, so that molded articles thereof are used in a variety of applications, such as machinery, electrical and electronic equipment, office automation equipment, automotive interior and exterior materials, and electric vehicles. In these applications, molded articles may be required to have flame retardancy. For example, molded articles used in housings (frames, enclosures, exteriors, covers, etc.) of electrical and electronic equipment or office automation equipment, as well as cables, require high flame retardancy. 【0003】 The flame retardancy of resin products can be improved by blending a flame retardant into the resin composition from which the resin product is made. Known resin compositions containing such flame retardants include a resin composition containing a thermoplastic resin (A), a phosphorus-based flame retardant (B), and a copolymer (C) of an α-olefin and an unsaturated carboxylic acid in specific proportions (see, for example, Patent Document 1). 【0004】 International Publication No. 2021 / 241682 【0005】 On the other hand, resin products that require flame retardancy are usually required to exhibit properties other than flame retardancy, and therefore flame-retardant resin products are sometimes required to have greater freedom in their composition. 【0006】 An object of one aspect of the present invention is to provide a technique suitable for increasing the degree of freedom in the composition of flame-retardant resin products. 【0007】 In order to solve the above problems, a resin composition according to one aspect of the present invention comprises a thermoplastic resin (A), a phosphorus-based flame retardant (B), and an acid-modified polyolefin resin (C), in which the proportion of the phosphorus-based flame retardant (B) is 70 mass% or more. 【0008】 In addition, in order to solve the above-mentioned problems, a method for manufacturing a resin product according to one aspect of the present invention produces a resin product by molding a product resin composition obtained by diluting the above-mentioned resin composition with a material composition. 【0009】 In order to solve the above-mentioned problems, a flame retardant masterbatch according to one aspect of the present invention is a pellet of the above-mentioned resin composition. 【0010】 According to one aspect of the present invention, it is possible to provide a resin composition suitable for increasing the degree of freedom in the composition of a flame-retardant resin product, a method for producing a resin product, and a flame-retardant masterbatch. 【0011】 [Resin Composition] An embodiment of the present invention will be described in detail below. The resin composition according to the embodiment of the present invention contains a thermoplastic resin (A), a phosphorus-based flame retardant (B), and an acid-modified polyolefin resin (C). 【0012】 [Thermoplastic resin (A)] The thermoplastic resin is not particularly limited, and examples thereof include polyolefin resin, polycarbonate resin, polyester resin, acrylonitrile styrene resin, ABS resin, polyamide resin, and modified polyphenylene oxide. These may be used alone or in combination of two or more. For example, the thermoplastic resin (A) may be a composite resin of two or more of the above thermoplastic resins. 【0013】 The polyolefin resin is not particularly limited, and examples thereof include the resins described below. The polyester resin is not particularly limited, and examples thereof include polybutylene terephthalate. The polyamide resin is not particularly limited, and examples thereof include nylon 66 and nylon 6. Among these, the present invention is particularly useful when the thermoplastic resin (A) is a polyolefin resin. 【0014】 In the present invention, "polyolefin resin" means a resin in which the proportion of olefin units or cycloolefin units relative to 100 mol% of all structural units constituting the resin is 90 mol% or more. The proportion of olefin units or cycloolefin units relative to 100 mol% of all structural units constituting the polyolefin resin is preferably 95 mol% or more, and particularly preferably 98 mol% or more. 【0015】Examples of polyolefin resins include α-olefin polymers such as polyethylene, polypropylene, polybutene, poly(3-methyl-1-butene), poly(3-methyl-1-pentene), and poly(4-methyl-1-pentene); α-olefin copolymers such as ethylene-propylene block or random copolymers, α-olefin-propylene block or random copolymers having 4 or more carbon atoms, ethylene-methyl methacrylate copolymers, and ethylene-vinyl acetate copolymers; and cycloolefin polymers such as polycyclohexene and polycyclopentene. Examples of polyethylene include low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. Examples of polypropylene include isotactic polypropylene, syndiotactic polypropylene, hemiisotactic polypropylene, and stereoblock polypropylene. In α-olefin-propylene block or random copolymers having 4 or more carbon atoms, examples of α-olefins having 4 or more carbon atoms include butene, 3-methyl-1-butene, 3-methyl-1-pentene, and 4-methyl-1-pentene. These polyolefin resins may be used alone or in combination of two or more. 【0016】 The polyolefin resin preferably contains polypropylene. Polypropylene may be used in combination with other polyolefin resins. For example, the polyolefin resin may be a mixture of polypropylene and other α-olefin polymers, such as an ethylene-propylene block or random copolymer, or an α-olefin-propylene block or random copolymer having 4 or more carbon atoms. 【0017】 The polyolefin resin is preferably composed mainly of polypropylene. The proportion of polypropylene relative to 100% by mass of the polyolefin resin is preferably 50% by mass or more, more preferably 60% by mass or more. From the viewpoint of flame retardancy, it is particularly preferable that 100% by mass of the polyolefin resin is polypropylene. 【0018】The melt mass flow rate (MFR) of the thermoplastic resin (A) is preferably 0.1 g / 10 min or more, more preferably 0.5 g / 10 min or more, and is preferably 80 g / 10 min or less, more preferably 60 g / 10 min or less. When the MFR of the thermoplastic resin (A) is above the lower limit, the molding processability is superior, and when it is below the upper limit, the bending properties, tensile properties, chemical resistance, etc. are superior. The preferred lower and upper limits can be appropriately combined (the same applies hereinafter). The MFR of the thermoplastic resin (A) may be, for example, 0.1 g / 10 min or more and 80 g / 10 min or less, or 0.5 g / 10 min or more and 60 g / 10 min or more. The melt mass flow rate of the thermoplastic resin (A) is measured in accordance with JIS K7210 at a temperature of 230°C and a load of 2.16 kg. 【0019】 The proportion of the thermoplastic resin (A) relative to the total mass of the resin composition is preferably 29% by mass or less, more preferably 27% by mass or less, and even more preferably 25% by mass or less from the viewpoint of increasing the content of the phosphorus-based flame retardant (B) in the resin composition, while from the viewpoint of productivity, it is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 18% by mass or more. 【0020】 The polypropylene preferably has an MFR of 10 g / 10 min or more, more preferably 20 g / 10 min or more. Polypropylene with high fluidity is suitable for use as a masterbatch. 【0021】 [Phosphorus-based flame retardant (B)] The phosphorus-based flame retardant (B) is a phosphorus compound, i.e., a compound containing a phosphorus atom in the molecule. The phosphorus-based flame retardant (B) exerts a flame retardant effect by forming char when the resin composition is burned. The phosphorus-based flame retardant (B) may be a known compound, such as a (poly)phosphate and a (poly)phosphate ester. "(Poly)phosphate" refers to a phosphate or a polyphosphate. "(Poly)phosphate ester" refers to a phosphate ester or a polyphosphate ester. The phosphorus-based flame retardant (B) is preferably solid at 80°C. 【0022】In terms of flame retardancy, the phosphorus-based flame retardant (B) is preferably a (poly)phosphate, such as ammonium polyphosphate, melamine polyphosphate, piperazine polyphosphate, piperazine orthophosphate, melamine pyrophosphate, piperazine pyrophosphate, melamine polyphosphate, melamine orthophosphate, calcium phosphate, and magnesium phosphate. 【0023】In addition, in the above examples, compounds in which melamine or piperazine is replaced with other nitrogen compounds can also be used. Examples of other nitrogen compounds include N,N,N',N'-tetramethyldiaminomethane, ethylenediamine, N,N'-dimethylethylenediamine, N,N'-diethylethylenediamine, N,N-dimethylethylenediamine, N,N-diethylethylenediamine, N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-diethylethylenediamine, 1,2-propanediamine, 1,3-propanediamine, ... ethylenediamine, pentamethylenediamine, hexamethylenediamine, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, trans-2,5-dimethylpiperazine, 1,4-bis(2-aminoethyl)piperazine, 1,4-bis(3-aminopropyl)piperazine, acetoguanamine, benzoguanamine, acrylguanamine, 2,4-diamino-6-nonyl-1,3,5-trimethyl- azine, 2,4-diamino-6-hydroxy-1,3,5-triazine, 2-amino-4,6-dihydroxy-1,3,5-triazine, 2,4-diamino-6-methoxy-1,3,5-triazine, 2,4-diamino-6-ethoxy-1,3,5-triazine, 2,4-diamino-6-propoxy-1,3,5-triazine, 2,4-diamino-6-isopropoxy-1,3,5-triazine, 2,4-diamino-6-mercapto-1, Examples of the (poly)phosphate salts include 3,5-triazine, 2-amino-4,6-dimercapto-1,3,5-triazine, ammeline, benzguanamine, acetoguanamine, phthalodiguanamine, melamine cyanurate, melamine pyrophosphate, butylenediguanamine, norbornenediguanamine, methylenediguanamine, ethylenedimelamine, trimethylenedimelamine, tetramethylenedimelamine, hexamethylenedimelamine, and 1,3-hexylenedimelamine. These (poly)phosphate salts may be used alone or in combination of two or more. 【0024】Among the above, the phosphorus-based flame retardant (B) is preferably a salt of (poly)phosphoric acid and a nitrogen compound (hereinafter also referred to as "compound (B1)"). Compound (B1) is an intumescent flame retardant, and forms a surface expansion layer (intemescent) which is a foamed char when the resin composition is burned. The formation of the surface expansion layer suppresses the diffusion or heat transfer of decomposition products, thereby exhibiting excellent flame retardancy. Examples of the nitrogen compound in compound (B1) include ammonia, melamine, piperazine, and the other nitrogen compounds described above. 【0025】 Commercially available phosphorus-based flame retardants (B) include, for example, Adekastab (registered trademark) FP-2100J, FP-2200, and FP-2500S (manufactured by ADEKA Corporation). 【0026】 The proportion of the phosphorus-based flame retardant (B) relative to the total amount of the resin composition is 70% by mass or more. A proportion of 70% by mass or more is suitable from the viewpoint of enhancing the flame retardancy of the resin composition and fully exhibiting desired properties other than flame retardancy in the resin composition. Furthermore, a proportion of 70% by mass or more is suitable for using the resin composition as a flame retardant masterbatch (hereinafter also referred to as "masterbatch") and is suitable for increasing the degree of freedom in the composition of components other than the flame retardant in the resin composition (hereinafter also referred to as "full compound") that serves as the material for a resin product. Furthermore, a proportion of 70% by mass or more can exhibit high flame retardancy in a resin product and further increase tensile strength when used as a masterbatch in combination with the acid-modified polyolefin resin (C) described below. Furthermore, a proportion of 70% by mass or more can reduce the electrostatic charge of the resin composition. This prevents the resin composition pellets from becoming charged and adhering to the inner walls of a container or a hopper, or from adhering to each other, when the resin composition is pelletized and used as a masterbatch, thereby improving the handleability of the pellets. 【0027】The proportion of the phosphorus-based flame retardant (B) relative to the total amount of the resin composition may be 71 mass% or more, 72 mass% or more, 73 mass% or more, or 74 mass% or more, but from the above-mentioned viewpoint, it is preferably 75 mass% or more, more preferably 76 mass% or more, and even more preferably 78 mass% or more. Furthermore, the proportion may be appropriately determined from the viewpoint of sufficiently dispersing the phosphorus-based flame retardant (B), and from such viewpoint, it may be 90 mass% or less, 85 mass% or less, or 82 mass% or less. 【0028】 The ratio (B / A) of the phosphorus-based flame retardant (B) to the thermoplastic resin (A) is preferably 2.4 times or more, more preferably 3.0 times or more, and even more preferably 4.0 times or more, from the viewpoint of flame retardancy and from the viewpoint of increasing the degree of freedom in the composition of a full compound when used as a resin composition or a masterbatch. On the other hand, from the viewpoint of productivity, the ratio may be 9.0 times or less. 【0029】 [Acid-Modified Polyolefin Resin (C)] The acid-modified polyolefin resin (C) improves the dispersibility of the phosphorus-based flame retardant (B) in the thermoplastic resin (A). Furthermore, by including the acid-modified polyolefin resin (C) in the resin composition, it is possible to obtain a resin composition containing the phosphorus-based flame retardant (B) at a very high concentration. In the present invention, the term "acid-modified polyolefin resin (C)" refers to a polyolefin having a structure chemically modified with an acidic monomer, such as a copolymer of an α-olefin and an unsaturated carboxylic acid (hereinafter also referred to as "copolymer (C)"). 【0030】 The copolymer refers to a copolymer in which the proportion of α-olefin units relative to 100 mol% of the total of α-olefin units and unsaturated carboxylic acid units is 20 mol% or more and 80 mol% or less. In copolymer (C), the proportion of α-olefin units relative to 100 mol% of the total of α-olefin units and unsaturated carboxylic acid units is preferably 30 mol% or more from the viewpoint of improving the compatibility between copolymer (C) and thermoplastic resin (A), and is preferably 70 mol% or less from the viewpoint of improving the compatibility between copolymer (C) and phosphorus-based flame retardant (B). 【0031】In the copolymer (C), the α-olefin preferably has 5 or more and 80 or less carbon atoms. If the α-olefin has 5 or more carbon atoms, compatibility with polyolefin resins in particular tends to be better, and if the α-olefin has 80 or less carbon atoms, raw material costs tend to be better. For these reasons, the lower limit of the number of carbon atoms in the α-olefin is more preferably 10 or more, even more preferably 12 or more, still more preferably 15 or more, and particularly preferably 18 or more. Also, for the above reasons, the upper limit of the number of carbon atoms in the α-olefin is more preferably 70 or less, and even more preferably 60 or less. 【0032】 In the copolymer (C), examples of the unsaturated carboxylic acid include (meth)acrylic acid, maleic acid, methylmaleic acid, fumaric acid, methylfumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, glutaconic acid, norbornane-5-ene-2,3-dicarboxylic acid, and esters, anhydrides, imides, etc. of these unsaturated carboxylic acids. "(Meth)acrylic acid" refers to acrylic acid or methacrylic acid. 【0033】 Specific examples of the ester, anhydride or imide of unsaturated carboxylic acid include (meth)acrylic acid esters such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate and glycidyl (meth)acrylate; dicarboxylic acid anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride and 5-norbornene-2,3-dicarboxylic acid anhydride; and maleimide compounds such as maleimide, N-ethylmaleimide and N-phenylmaleimide. 【0034】 As the unsaturated carboxylic acid, one of these may be used alone, or two or more of them may be used in combination. Among them, from the viewpoint of copolymerization reactivity, esters of unsaturated carboxylic acids or dicarboxylic acid anhydrides are preferred. Among them, from the viewpoint of compatibility with the phosphorus-based flame retardant (B), dicarboxylic acid anhydrides are preferred, and maleic anhydride is particularly preferred. 【0035】The weight average molecular weight of the copolymer (C) is preferably 2,000 or more, more preferably 3,000 or more, and is preferably 50,000 or less, more preferably 30,000 or less. When the weight average molecular weight of the copolymer (C) is within the above upper and lower limit ranges, the dispersibility of the phosphorus-based flame retardant (B) is better. The weight average molecular weight of the copolymer (C) may be, for example, 2,000 or more and 50,000 or less, or 3,000 or more and 30,000 or less. The weight average molecular weight of the copolymer (C) is a value calculated in terms of standard polystyrene, measured by dissolving the copolymer (C) in tetrahydrofuran (THF) and performing gel permeation chromatography. 【0036】 Commercially available copolymers (C) include, for example, Lycorb (registered trademark) CE2 (manufactured by Clariant Japan KK) and Diacarna (registered trademark) 30M (manufactured by Mitsubishi Chemical Corporation). 【0037】 In the resin composition, the proportion of the acid-modified polyolefin resin (C) can be appropriately determined from the viewpoint of sufficiently dispersing the phosphorus-based flame retardant (B). From the viewpoint of improving the tensile properties of the resin composition, the proportion is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 4.8% by mass or less, and particularly preferably 4.6% by mass or less. Furthermore, from the viewpoint of well dispersing the phosphorus-based flame retardant (B) in the resin composition, the proportion is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more. 【0038】When the ratio of the acid-modified polyolefin resin (C) to the phosphorus-based flame retardant (B) is within the above range, when the resin composition is used as a masterbatch, a resin product having high flame retardancy while maintaining high mechanical strength and a high flexural modulus can be obtained. From the above viewpoint, the ratio of the acid-modified polyolefin resin (C) to the phosphorus-based flame retardant (B) in the resin composition may be, for example, 15% by mass or less, 12% by mass or less, 10% by mass or less, 9% by mass or less, 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, or 6% by mass or more. 【0039】 The ratio of the phosphorus-based flame retardant (B) to the acid-modified polyolefin resin (C) is preferably 15 or more, or preferably 20 or more, from the viewpoint of obtaining a resin product having high flame retardancy while maintaining high mechanical strength and a high flexural modulus when the resin composition is used as a masterbatch. From the viewpoint of the stability of the composition as a masterbatch or the stability of the performance of the masterbatch, the ratio is preferably 25 or less, or preferably 20 or less, or preferably 18 or less. 【0040】 The proportion of the total mass of the thermoplastic resin (A), the phosphorus-based flame retardant (B), and the acid-modified polyolefin resin (C) relative to the total mass of the resin composition according to this embodiment is not particularly limited, but is preferably high from the viewpoint of increasing the degree of freedom in the composition when used as a masterbatch. From this viewpoint, this proportion is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more. 【0041】[Other Components] The resin composition according to this embodiment may further contain other components in addition to the thermoplastic resin (A), the phosphorus-based flame retardant (B), and the acid-modified polyolefin resin (C), as long as the effects of the present invention are obtained. The other components may be one or more, and the type and amount thereof may be appropriately determined as long as both the effects of the present invention and the effects of the other components are obtained. Examples of other components include flame retardants and flame retardant auxiliaries other than the phosphorus-based flame retardant (B). 【0042】 Other flame retardants or flame retardant auxiliaries are preferably halogen-free organic or inorganic flame retardants or flame retardant auxiliaries, such as triazine ring-containing compounds, silicone flame retardants, metal hydroxides, metal oxides, boric acid compounds, expandable graphite, and fluorine-based anti-drip agents. 【0043】Examples of triazine ring-containing compounds include melamine, ammeline, benzguanamine, acetoguanamine, phthalodiguanamine, melamine cyanurate, butylenediguanamine, norbornenediguanamine, methylenediguanamine, ethylenedimelamine, trimethylenedimelamine, tetramethylenedimelamine, hexamethylenedimelamine, and 1,3-hexylenedimelamine. Examples of silicone flame retardants include silicone oil, silicone rubber, and silicone resin. Examples of metal hydroxides include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, barium hydroxide, zinc hydroxide, and Kismer 5A (a registered trademark of magnesium hydroxide manufactured by Kyowa Chemical Industry Co., Ltd.). Examples of metal oxides include inorganic compounds such as zinc oxide, titanium oxide, aluminum oxide, magnesium oxide, titanium dioxide, and hydrotalcite, as well as surface-treated products thereof. Specific examples of metal oxides include TIPAQUE R-680 (a registered trademark of titanium oxide manufactured by Ishihara Sangyo Kaisha, Ltd.), Kyowamag 150 (a registered trademark of magnesium oxide manufactured by Kyowa Chemical Industry Co., Ltd.), DHT-4A (hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.), and Alkamiser 4 (a registered trademark of zinc-modified hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.). Examples of boric acid compounds include zinc borate. Examples of fluorine-based drip prevention agents include polytetrafluoroethylene (PTFE). These flame retardants or flame retardant assistants may be used alone or in combination of two or more. 【0044】 In addition to the above, the resin composition may contain additives that are commonly used in synthetic resins, such as crosslinking agents, antistatic agents, metal soaps, fillers, antifogging agents, anti-plateout agents, surface treatment agents, fluorescent agents, antifungal agents, bactericides, foaming agents, metal deactivators, release agents, pigments, or processing aids, within the range in which the effects of the present invention can be obtained. 【0045】As described above, the resin composition of the present invention can contain various additives, etc. When the resin composition is used as a flame retardant masterbatch, the content of mineral-derived inorganic fillers such as calcium carbonate or talc in the resin composition is preferably 5% by mass or less. In this case, the handleability as a masterbatch is improved. From the same viewpoint, the content is more preferably 3% by mass or less, even more preferably 2% by mass or less, and particularly preferably 1% by mass or less. 【0046】 [Method for Producing Resin Composition] Any method can be used to produce the resin composition. For example, the thermoplastic resin (A), the phosphorus-based flame retardant (B), the acid-modified polyolefin resin (C), and, if necessary, other components such as other flame retardants or flame retardant aids, are thoroughly mixed using a premixing means such as a V-type blender, a Henschel mixer, a mechanochemical device, or an extrusion mixer, and optionally granulated using an extrusion granulator or briquetting machine. The mixture is then melt-kneaded and extruded in a melt kneader. Examples of melt kneaders include twin-screw extruders such as vented twin-screw extruders, Banbury mixers, kneading rolls, single-screw extruders, and multi-screw extruders with three or more screws. The temperature during melt kneading is, for example, 170 to 260°C. The form of the resin composition extruded as described above is not limited, but when used as a masterbatch for a resin product, pellets are preferred from the standpoints of ease of handling and ease of kneading with other materials. In this case, the resin composition melt-kneaded as described above may be directly cut into pellets using a machine such as a pelletizer, or may be cooled to form strands, and then the strands may be cut into pellets using a machine such as a pelletizer, or a mass of the resin composition separately molded into a body may be crushed and pelletized. Here, pellets refer to fine pieces of the resin composition having a major axis length of 0.1 to 10 mm, regardless of the production method. 【0047】The resin composition is suitable for use as a flame retardant masterbatch for dispersing a phosphorus-based flame retardant (B) in a material resin composition (full compound) for resin products. Since the resin composition contains a sufficiently large amount of the phosphorus-based flame retardant (B), the degree of freedom in the composition of the full compound is further increased. Therefore, the resin composition can be applied to the production of various resin products requiring flame retardancy. 【0048】 It is preferable that the resin composition has a suitable antistatic property from the viewpoint of improving the handling property when used as a masterbatch. From this viewpoint, the surface resistivity of the resin composition is 1×10 １２ Ω cm or less, and may be 1×10 １１ Ω cm or less, or 1×10 １０ The lower limit is usually 1×10 ５ The surface resistance of the resin composition can be measured according to JIS K 6911, for example. 【0049】 A masterbatch obtained by pelletizing the resin composition (i.e., pellets of the resin composition) preferably has a specific surface condition from the viewpoint of improving handleability when used as a masterbatch. From this viewpoint, the surface roughness (arithmetic mean roughness Ra) of the resin composition pellets is preferably 5 μm or less, more preferably 4 μm or less, even more preferably 3.5 μm or less, and particularly preferably 3 μm or less. On the other hand, from the viewpoint of handleability, the surface roughness (arithmetic mean roughness Ra) of the resin composition pellets may be 0.5 μm or more. 【0050】 From the same viewpoint, the surface roughness (maximum peak height Rp) of the resin composition pellets is preferably 15 μm or less, more preferably 10 μm or less, and even more preferably 9 μm or less. On the other hand, from the viewpoint of handleability, the surface roughness (maximum peak height Rp) of the resin composition pellets may be 1 μm or more. 【0051】From the same viewpoint, the surface roughness (maximum valley depth Rv) of the resin composition pellets is preferably 15 μm or less, more preferably 10 μm or less, and even more preferably 9 μm or less. On the other hand, from the viewpoint of handleability, the surface roughness (maximum valley depth Rv) of the resin composition pellets may be 1 μm or more. 【0052】 From the same viewpoint, the surface roughness (maximum height Rz) of the resin composition pellets is preferably 30 μm or less, more preferably 25 μm or less, and even more preferably 20 μm or less. On the other hand, from the viewpoint of handleability, the surface roughness (maximum height Rz) of the resin composition pellets may be 5 μm or more. 【0053】 From the same viewpoint, the surface roughness (maximum cross-sectional height Rt) of the resin composition pellets is preferably 30 μm or less, more preferably 25 μm or less, and even more preferably 20 μm or less. On the other hand, from the viewpoint of handleability, the surface roughness (maximum cross-sectional height Rt) of the resin composition pellets may be 5 μm or more. 【0054】 The surface roughness of the resin composition pellets was measured as follows: Three pellets of the obtained resin composition were randomly selected, and for each pellet, two 100 μm widths were measured at locations other than the cut surface of the pellet using a hybrid laser microscope (OPTELICS HYBRID C3, manufactured by Lasertec Corporation), and the average value was used (in accordance with JIS B0601:2001 (ISO4278:1997)). 【0055】 When the surface roughness of the resin composition pellets is within the above range, it is possible to suppress powder falling off of the flame retardant component and improve the transportability (fluidity) of the resin composition pellets, making them particularly suitable as a masterbatch. 【0056】Generally, in the case of a flame retardant masterbatch, the higher the concentration of the flame retardant, the more pronounced the surface roughness of the masterbatch tends to be. In contrast, as is clear from the above, pellets of the resin composition according to one embodiment of the present invention (flame retardant masterbatch) have little surface roughness and a relatively good surface condition, despite containing a high concentration of flame retardant. Therefore, they have excellent transportability (fluidity) and good handleability. The reason for this surface condition is unclear, but it is thought to be one of the effects attributable to the acid-modified polyolefin resin (C). 【0057】 [Method of Manufacturing a Resin Product] An embodiment of the present invention includes a method of manufacturing a resin product, in which the resin composition is diluted with a material composition to form a product resin composition, and the resin composition thus obtained contains a phosphorus-based flame retardant (B) at a high concentration, and therefore is suitable for use as a masterbatch for flame retardants. 【0058】 A resin product according to one aspect of the present invention is made of the resin composition according to the present embodiment. The shape of the resin product is not particularly limited, and may be in various shapes such as a resin plate, sheet, film, cable, or irregularly shaped product. 【0059】 The resin product can be obtained by molding the resin composition. The molding method is not particularly limited, and examples include extrusion, calendaring, injection molding, rolling, compression molding, and blow molding. The temperature at which the resin composition is molded is, for example, 170 to 260°C. 【0060】 The material composition contains, for example, a matrix resin and other material components other than the matrix resin and the resin composition. 【0061】[Matrix Resin] The above-described thermoplastic resin (A) can be used as the matrix resin. The thermoplastic resin (A) as the matrix resin may be the same as or different from the thermoplastic resin (A) in the resin composition described above, but it is preferable that the thermoplastic resin (A) as the matrix resin is the same as the thermoplastic resin (A) in the resin composition described above. The ratio of the matrix resin to the resin composition described above may be determined appropriately based on the flame retardancy required for the resin product. For example, the ratio may be 100 to 500 mass%. 【0062】 From the viewpoint of improving flame retardancy, it is preferable to use a polyolefin-based resin as the matrix resin from among the above-mentioned thermoplastic resins (A) and to use a polyolefin-based resin as the thermoplastic resin (A) of the resin composition. 【0063】 [Other Material Components] The material composition may contain at least one inorganic fiber filler (D) selected from the group consisting of glass fiber and carbon fiber. The inorganic fiber filler (D) may be used alone or in combination of two or more. 【0064】 The type of glass fiber is not particularly limited, and any glass fiber such as E-glass, C-glass, S-glass, or D-glass can be used. The form of the glass fiber is also not particularly limited, and any glass fiber such as chopped strand, roving, yarn, or glass wool can be used, but chopped strand or glass wool is preferred from the viewpoint of workability. 【0065】 The type of carbon fiber is not particularly limited, and any carbon fiber can be used, such as polyacrylonitrile (PAN)-based carbon fiber, pitch-based carbon fiber, graphite fiber, etc. The form of the carbon fiber is also not particularly limited, and any carbon fiber can be used, such as filament, regular tow, large tow, stable yarn, and chopped strand, but chopped strand is preferred from the viewpoint of workability. 【0066】When the material composition contains an inorganic fiber filler (D), the proportion of the inorganic fiber filler (D) relative to the total mass of the material composition is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, and is preferably 50 mass% or less, more preferably 40 mass% or less, more preferably 30 mass% or less, more preferably 25 mass% or less, more preferably 10 mass% or less, even more preferably 5 mass% or less, and particularly preferably 3 mass% or less. When the proportion of the inorganic fiber filler (D) is at least the lower limit, it is easy to obtain anti-ripping effects and smoke suppression effects, and when it is at most the upper limit, it is difficult to impair the inherent physical properties of the matrix resin. 【0067】 When the material composition contains an inorganic fiber filler (D), it may further contain an interfacial strength improver (E) for the inorganic fiber filler (D). As the interfacial strength improver (E), a polymer having an olefin skeleton (excluding polyolefin resins and copolymers (C)) is preferred, particularly from the viewpoint of compatibility with the thermoplastic resin (A) such as a polyolefin resin. The compatibility of the olefin skeleton with the polyolefin resin further improves the interfacial strength. 【0068】 The interfacial strength improver (E) preferably has an acidic group. The interfacial strength is further improved by the reaction of the inorganic fibrous filler (D) with the acidic group. Examples of the acidic group include a carboxyl group, a carboxylic anhydride group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, and a phosphinic acid group. At least one selected from the group consisting of a carboxyl group, a carboxylic anhydride group, a sulfonic acid group, a sulfinic acid group, a phosphonic acid group, and a phosphinic acid group is preferred, at least one selected from the group consisting of a carboxyl group, a carboxylic anhydride group, and a phosphonic acid group is more preferred, and at least one selected from the group consisting of a carboxyl group and a carboxylic anhydride group is particularly preferred. 【0069】Examples of methods for producing the interfacial strength improver (E) having an olefin skeleton and an acidic group include (1) a method in which an olefin resin is thermally decomposed at high temperature to reduce its molecular weight, and then a compound or monomer having an acidic group is added; (2) a method in which a low-molecular-weight olefin resin is polymerized, and then a compound or monomer having an acidic group is added; and (3) a method in which an α-olefin and a compound or monomer having an acidic group are copolymerized. Examples of the polymerization method include radical polymerization methods such as solution polymerization, emulsion polymerization, suspension polymerization, and bulk polymerization, as well as living polymerization methods. Furthermore, a method in which a macromonomer is first formed and then polymerized can also be used. Examples of compounds or monomers having an acidic group include acrylic acid, methacrylic acid, maleic acid, fumaric acid, maleic anhydride, and citraconic anhydride, with maleic anhydride being particularly preferred. 【0070】 Commercially available examples of the interfacial strength improver (E) include UMEX (registered trademark) 1001 and 1010 (manufactured by Sanyo Chemical Industries, Ltd.), and KAYABRID (registered trademark of Kayaku Akzo Co., Ltd.) 002PP and 003PP (manufactured by Kayaku Nouryon Co., Ltd.). 【0071】 The material composition may contain at least one selected from the group consisting of an antioxidant, an ultraviolet absorber, a light stabilizer, and an antiaging agent. 【0072】Examples of the antioxidant include phenol-based antioxidants, phosphorus-based antioxidants, and thioether-based antioxidants. Examples of the phenol-based antioxidant include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, distearyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide], 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6 -tert-butylphenol), 4,4'-butylidenebis(6-tert-butyl-m-cresol), 2,2'-ethylidenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(4-sec-butyl-6-tert-butylphenol), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl)isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate cyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 2-tert-butyl-4-methyl-6-(2-acryloyloxy-3-tert-butyl-5-methylbenzyl)phenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methyl]methane, thiodiethylene glycol bis[(3,5-di-tert-butyl-4-hydroxyphenyl) ) propionate], 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butylic acid]glycol ester, bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl]terephthalate, 1,3,5-tris[(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxyethyl]isocyanurate, 3,9-bis[1,Examples of the phenolic antioxidant include 1-dimethyl-2-{(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane and triethylene glycol bis[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]. The content of the phenolic antioxidant is preferably 0.001 parts by mass or more, more preferably 0.05 parts by mass or more, per 100 parts by mass of the synthetic resin component in the full compound, and is preferably 10 parts by mass or less, more preferably 5 parts by mass or less. 【0073】Examples of phosphorus-based antioxidants include trisnonylphenyl phosphite, tris[2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecyl phosphite, octyldiphenyl phosphite, di(decyl)monophenyl phosphite, di(tridecyl)pentaerythritol diphosphite, di(nonylphenyl)pentaerythritol diphosphite, bis(2,4-ditert-butylphenyl)phosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tetra(tridecyl)isopropylidenediphenol diphosphite, tetra(tridecyl)-4,4'-n-butylidenebis(2-tert-butyl-5-methylphenol) hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane triphosphite, tetrakis(2,4-di-tert-butylphenyl)biphenylene diphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2,2'-methylenebis(4,6-tert-butylphenyl)-2-ethylhexyl phosphite, 2,2'-methylenebis(4,6-tert-butylphenyl)-2-ethylhexyl phosphite Examples of such antioxidants include tris(2-[(2,4,8,10-tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]ethyl)amine, a phosphite of 2-ethyl-2-butylpropylene glycol and 2,4,6-tri-tert-butylphenol, and tris(2,4-di-tert-butylphenyl)phosphite. The content of the phosphorus-based antioxidant is preferably 0.001 part by mass or more, more preferably 0.05 part by mass or more, and is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, per 100 parts by mass of the synthetic resin component in the full compound. 【0074】Examples of thioether antioxidants include dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiodipropionate, as well as pentaerythritol tetra(β-alkylthiopropionate esters). The content of the thioether antioxidant is preferably 0.001 parts by mass or more, more preferably 0.05 parts by mass or more, and is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, per 100 parts by mass of the synthetic resin component in the full compound. 【0075】Examples of the ultraviolet absorber include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and 5,5'-methylenebis(2-hydroxy-4-methoxybenzophenone); 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-tert-butylphenyl)-5-chlorobenzotriazole, and 2-(2'-hydroxyphenyl)benzotriazoles such as 2-(2'-hydroxy-5'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-dicumylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl-6-(benzotriazolyl)phenol), and 2-(2'-hydroxy-3'-tert-butyl-5'-carboxyphenyl)benzotriazole; phenylsalicylic acid benzoates such as benzoyl silane, resorcinol monobenzoate, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, 2,4-di-tert-amylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, and hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate; substituted oxanilides such as 2-ethyl-2'-ethoxyoxanilide and 2-ethoxy-4'-dodecyloxanilide; ethyl-α-cyano-β,β-diphenylacrylate, and methyl cyanoacrylates such as 2-(2-cyano-3-methyl-3-(p-methoxyphenyl)acrylate; and triaryltriazines such as 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2,4-di-tert-butylphenyl)-s-triazine, 2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-s-triazine, and 2-(2-hydroxy-4-propoxy-5-methylphenyl)-4,6-bis(2,4-di-tert-butylphenyl)-s-triazine.The content of the ultraviolet absorber is preferably 0.001 parts by mass or more, more preferably 0.05 parts by mass or more, per 100 parts by mass of the synthetic resin component in the full compound, and is preferably 30 parts by mass or less, more preferably 10 parts by mass or less. 【0076】Examples of light stabilizers include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate, and tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanol. tetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, bis(2,2,6,6-tetramethyl-4-piperidyl) di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,4,4-pentamethyl-4-piperidyl)-2-butyl-2-(3,5-di-tert-butyl-4-hydroxybenzyl) Malonate, 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol / diethyl succinate polycondensate, 1,6-bis(2,2,6,6-tetramethyl-4-piperidylamino)hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis(2,2,6,6-tetramethyl-4-piperidylamino)hexane / 2,4-dichloro-6-tert-octylamino-s-triazine polycondensate, 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidylamino)]hexane / 2,4-dichloro-6-tert-octylamino-s-triazine polycondensate, 1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino)-s-triazin-6-yl]-1,5,8-12-tetraazadodecane, 1,6,11-tris[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidyl)amino)-s-triazin-6-yl]aminoundecane, and 1,6,11-tris[2,4-bis(N-butyl-N-(1,2,2,6,Examples of suitable light stabilizers include hindered amine compounds such as (6-pentamethyl-4-piperidyl)amino)-s-triazin-6-yl)aminoundecane. The content of the light stabilizer is preferably 0.001 parts by mass or more, more preferably 0.05 parts by mass or more, and is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, per 100 parts by mass of the synthetic resin component in the full compound. 【0077】 The material composition may contain fillers other than the inorganic fiber filler (D). The other fillers may be in the form of fibers, plates, particles, or powders. Specific examples of the other fillers include inorganic fibrous reinforcing materials such as asbestos fibers, metal fibers, potassium titanate whiskers, aluminum borate whiskers, magnesium whiskers, silicon whiskers, wollastonite, sepiolite, asbestos, slag fibers, zonolite, elestadite, gypsum fibers, silica fibers, silica-alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, and boron fibers; polyester fibers, nylon fibers, acrylic fibers, regenerated cellulose fibers, acetate fibers, kenaf, ramie, cotton, jute, hemp, sisal, flax, linen, silk, maize, and the like. Examples of suitable fillers include organic fibrous reinforcing materials such as chive hemp, sugarcane, wood pulp, waste paper, recycled paper, and wool, as well as plate-like or granular reinforcing materials such as glass flakes, non-swelling mica, graphite, metal foil, ceramic beads, clay, mica, sericite, zeolite, bentonite, dolomite, kaolin, finely powdered silicic acid, feldspar powder, potassium titanate, shirasu balloons, calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide, aluminum oxide, titanium oxide, titanium dioxide, aluminum silicate, gypsum, novaculite, dawsonite, and clay. These fillers may be coated or bundled with a thermoplastic resin such as ethylene-vinyl acetate copolymer or a thermosetting resin such as epoxy resin, or may be treated with a coupling agent such as aminosilane or epoxysilane. The content of the other filler is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, per 100 parts by mass of the synthetic resin component in the full compound, and is preferably 60 parts by mass or less, more preferably 50 parts by mass or less. 【0078】The material composition may contain a nucleating agent. As the nucleating agent, any agent generally used as a nucleating agent for polyolefin resins can be used as appropriate, such as inorganic nucleating agents and organic nucleating agents. 【0079】 Specific examples of inorganic crystal nucleating agents include kaolinite, synthetic mica, clay, zeolite, graphite, carbon black, magnesium oxide, titanium oxide, calcium sulfide, boron nitride, calcium carbonate, barium sulfate, aluminum oxide, neodymium oxide, and metal salts such as phenylphosphonate, etc. These inorganic crystal nucleating agents may be modified with an organic substance to enhance dispersibility in the composition. 【0080】Specific examples of organic crystal nucleating agents include sodium benzoate, potassium benzoate, lithium benzoate, calcium benzoate, magnesium benzoate, barium benzoate, lithium terephthalate, sodium terephthalate, potassium terephthalate, calcium oxalate, sodium laurate, potassium laurate, sodium myristate, potassium myristate, calcium myristate, sodium octacosanoate, calcium octacosanoate, sodium stearate, potassium stearate, lithium stearate, calcium stearate, magnesium stearate, barium stearate, sodium montanate, calcium montanate, sodium toluate, sodium salicylate, potassium salicylate, zinc salicylate, Examples of suitable organic carboxylic acid metal salts include aluminum dibenzoate, potassium dibenzoate, lithium dibenzoate, sodium β-naphthalate, and sodium cyclohexanecarboxylate; organic sulfonates such as sodium p-toluenesulfonate and sodium sulfoisophthalate; carboxylic acid amides such as stearic acid amide, ethylene bislauric acid amide, palmitic acid amide, hydroxystearic acid amide, erucic acid amide, and trimesic acid tris(t-butylamide); benzylidene sorbitol and derivatives thereof; metal salts of phosphorus compounds such as sodium 2,2′-methylenebis(4,6-di-t-butylphenyl)phosphate; and 2,2-methylbis(4,6-di-t-butylphenyl)sodium. 【0081】 The material composition may contain a plasticizer. As the plasticizer, any plasticizer generally used for polyolefin resins may be used appropriately, such as polyester-based plasticizers, glycerin-based plasticizers, polycarboxylic acid ester-based plasticizers, polyalkylene glycol-based plasticizers, and epoxy-based plasticizers. These plasticizers may be used alone or in combination of two or more. 【0082】Specific examples of polyester-based plasticizers include polyesters composed of an acid component such as adipic acid, sebacic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, or rosin, and a diol component such as propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, ethylene glycol, or diethylene glycol, or polyesters composed of hydroxycarboxylic acids such as polycaprolactone. These polyesters may be end-capped with a monofunctional carboxylic acid or a monofunctional alcohol, or may be end-capped with an epoxy compound or the like. 【0083】 Specific examples of glycerin-based plasticizers include glycerin monoacetomonolaurate, glycerin diacetomonolaurate, glycerin monoacetomonostearate, glycerin diacetomonooleate, and glycerin monoacetomonomonoacetate. 【0084】 Specific examples of polycarboxylic acid ester plasticizers include phthalate esters such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate, diheptyl phthalate, dibenzyl phthalate, and butyl benzyl phthalate; trimellitate esters such as tributyl trimellitate, trioctyl trimellitate, and trihexyl trimellitate; adipic acid esters such as diisodecyl adipate, n-octyl-n-decyl adipate, methyl diglycol butyl diglycol adipate, benzyl methyl diglycol adipate, and benzyl butyl diglycol adipate; citric acid esters such as triethyl acetyl citrate and tributyl acetyl citrate; azelaic acid esters such as di-2-ethylhexyl azelaate; and sebacate esters such as dibutyl sebacate and di-2-ethylhexyl sebacate. 【0085】Specific examples of polyalkylene glycol plasticizers include polyethylene glycol, polypropylene glycol, poly(ethylene oxide-propylene oxide) block and / or random copolymers, polytetramethylene glycol, and polyalkylene glycols such as ethylene oxide addition polymers of bisphenols, propylene oxide addition polymers of bisphenols, and tetrahydrofuran addition polymers of bisphenols, as well as terminally blocked compounds thereof such as terminally epoxy-modified compounds, terminally ester-modified compounds, and terminally ether-modified compounds. 【0086】 Epoxy plasticizers generally refer to epoxy triglycerides made from alkyl epoxy stearate and soybean oil, but other so-called epoxy resins, such as those made mainly from bisphenol A and epichlorohydrin, can also be used. 【0087】 Specific examples of other plasticizers include benzoic acid esters of aliphatic polyols such as neopentyl glycol dibenzoate, diethylene glycol dibenzoate, and triethylene glycol di-2-ethyl butyrate, fatty acid amides such as stearic acid amide, aliphatic carboxylic acid esters such as butyl oleate, oxyacid esters such as methyl acetylricinoleate and butyl acetylricinoleate, pentaerythritol, various sorbitols, polyacrylic acid esters, and paraffins. 【0088】 The material composition may contain a fluorine-containing anti-dripping agent. Examples of the fluorine-containing anti-dripping agent include fluorine-containing polymers having fibril-forming ability. Examples of such fluorine-containing polymers include polytetrafluoroethylene (hereinafter also referred to as "PTFE"), tetrafluoroethylene-based copolymers (e.g., tetrafluoroethylene / hexafluoropropylene copolymers), partially fluorinated polymers such as those disclosed in U.S. Pat. No. 4,379,910, and polycarbonate resins produced from fluorinated diphenols. Among these, PTFE is preferred. 【0089】Fibril-forming PTFE has an extremely high molecular weight and tends to bond together with other PTFE molecules to form fibers under external action such as shear force. The molecular weight, in terms of number average molecular weight calculated from the standard specific gravity, is preferably 1 million or more, more preferably 2 million or more, and is preferably 10 million or less, more preferably 9 million or less. Fibril-forming PTFE can be used in the form of a solid or an aqueous dispersion. 【0090】 Commercially available PTFE products having fibril-forming ability include, for example, Teflon (registered trademark) 6J from Mitsui-DuPont Fluorochemicals Co., Ltd. and Polyflon (registered trademark) MPA FA500 and F-201L from Daikin Industries, Ltd. Commercially available aqueous dispersions of PTFE include Fluon (registered trademark of AGC Inc.) AD-939E from Asahi ICI Fluoropolymers Co., Ltd., Fluon D-310 and D-210C from Daikin Industries, Ltd., and Teflon 31JR from Mitsui-DuPont Fluorochemicals Co., Ltd. 【0091】 In order to improve the dispersibility of fibril-forming PTFE in the full compound and obtain better flame retardancy, mechanical properties, and flexural modulus, it is also possible to use a PTFE mixture in the form of a mixture of fibril-forming PTFE and other resins. The proportion of PTFE relative to the total mass of the PTFE mixture is preferably 1% by mass or more, more preferably 5% by mass or more, and is preferably 60% by mass or less, more preferably 55% by mass or less. When the proportion of PTFE is within this range, good dispersibility of PTFE can be achieved. 【0092】The PTFE mixture can be prepared, for example, by (1) mixing an aqueous dispersion of PTFE with an aqueous dispersion or solution of another resin and co-precipitating to obtain a co-aggregated mixture (methods described in JP-A-60-258263, JP-A-63-154744, etc.), (2) mixing an aqueous dispersion of PTFE with dried particles of another resin (method described in JP-A-4-272957), or (3) uniformly mixing an aqueous dispersion of PTFE with a solution of another resin and simultaneously extracting each medium from the mixture. (3) a method of removing the PTFE (methods described in JP-A-06-220210, JP-A-08-188653, etc.), (4) a method of polymerizing a monomer that forms another resin in an aqueous dispersion of PTFE (method described in JP-A-09-95583), or (5) a method of uniformly mixing an aqueous dispersion of PTFE with a dispersion of another resin, polymerizing a vinyl monomer in the resulting mixed dispersion, and then obtaining a mixture (method described in JP-A-11-29679, etc.). Commercially available PTFE mixtures include "Metablen (registered trademark) A3000" from Mitsubishi Chemical Corporation and "BLENDEX (registered trademark of Galata Chemicals) B449" from GE Specialty Chemicals, etc. 【0093】 The content of the fluorine-containing anti-dripping agent is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, in terms of the amount of PTFE per 100 parts by mass of the full compound, while it is preferably 1 part by mass or less, more preferably 0.8 parts by mass or less, and even more preferably 0.5 parts by mass or less. 【0094】 The material composition may be a collection of the above-mentioned materials, a mixture of the above-mentioned materials, or a melt-kneaded mixture of the above-mentioned materials. That is, the material composition may be a masterbatch of the above-mentioned other components with the matrix resin as a dispersion medium. 【0095】 [Major Actions and Effects] The resin composition described above contains 70% by mass or more of the phosphorus-based flame retardant (B) in a state where the phosphorus-based flame retardant (B) is well dispersed in the resin composition. 【0096】It is generally believed that in order to achieve a high concentration of a target component in a masterbatch, the target component must melt during kneading. The phosphorus-based flame retardant (B) is usually a fine powder and has a high melting point, so it does not melt at the processing temperature of the thermoplastic resin (A) such as polypropylene. Since the phosphorus-based flame retardant (B) is a fine powder, it is desirable to make it into a masterbatch from the viewpoint of handling. However, since it does not melt at the processing temperature of the thermoplastic resin (A) as described above, it is generally considered difficult to appropriately disperse the phosphorus-based flame retardant (B) at a high concentration in the thermoplastic resin (A). 【0097】 However, in the resin composition described above, the phosphorus-based flame retardant (B) is properly dispersed without melting by kneading it with the acid-modified polyolefin resin (C), and by increasing the amount of the acid-modified polyolefin resin (C), it is possible to achieve a higher concentration of the phosphorus-based flame retardant (B). Since the resin composition contains a high concentration of the phosphorus-based flame retardant in a well-dispersed state, it can be suitably used as a masterbatch of the flame retardant in the full compound of a resin product, and it is possible to further increase the degree of freedom in the composition of materials other than the flame retardant in the full compound. 【0098】 When used as a masterbatch, the resin composition described above can exhibit excellent flame retardancy in a full compound while sufficiently maintaining the inherent physical properties of the matrix resin (e.g., mechanical strength and flexural modulus), as described in Patent Document 1. 【0099】 Furthermore, the resin composition has reduced electrostatic charge, and therefore, when used as a masterbatch, it is possible to achieve excellent handling properties. 【0100】Furthermore, as described above, the resin composition can contain a higher concentration of the phosphorus-based flame retardant (B) as a masterbatch, but accordingly contains a larger amount of the acid-modified polyolefin resin (C). The acid-modified polyolefin resin (C) has a low molecular weight and wax properties. Therefore, even if the amount of the phosphorus-based flame retardant (B) is large, the occurrence of shear heat tends to be suppressed during the production or use of the masterbatch, and therefore increases in resin temperature and resin pressure tend to be suppressed. Therefore, the resin composition can be produced or used as a masterbatch under more relaxed conditions than those depending on the amount of the phosphorus-based flame retardant (B). This makes processing easier during the production and use of the masterbatch (production of a full compound). 【0101】 Furthermore, when the resin composition is used as a masterbatch to produce a film-shaped resin product, the mechanical properties of the resin product can be further improved while maintaining high flame retardancy. Although the mechanism behind this is not clear, it is thought that the acid-modified polyolefin resin (C) improves the dispersibility of the phosphorus-based flame retardant (B) in the resin composition, and further increases the interfacial strength between the phosphorus-based flame retardant (B) and the matrix resin. 【0102】 [Summary] As is clear from the above description, the resin composition of the first aspect of the present invention comprises a thermoplastic resin (A), a phosphorus-based flame retardant (B), and an acid-modified polyolefin resin (C), and the proportion of the phosphorus-based flame retardant (B) is 70 mass% or more. Since the first aspect can be suitably used for a masterbatch for a flame retardant, the first aspect realizes a resin composition suitable for increasing the degree of freedom in the composition of a flame-retardant resin product. 【0103】 In a second aspect of the present invention, the proportion of the phosphorus-based flame retardant (B) in the first aspect is 75 mass% or more, which is even more effective from the viewpoint of increasing the degree of freedom in the resin product and improving the mechanical properties. 【0104】A third aspect of the present invention is the first or second aspect, wherein the proportion of the acid-modified polyolefin resin (C) is 10 mass% or less. The third aspect is more effective from the viewpoint of improving the tensile properties of the resin composition. 【0105】 A fourth aspect of the present invention is any one of the first to third aspects, wherein the ratio of the acid-modified polyolefin resin (C) to the phosphorus-based flame retardant (B) is 15 mass% or less. Since the ratio of the phosphorus-based flame retardant (B) is relatively increased in the fourth aspect, the fourth aspect is even more effective from the viewpoint of increasing the degree of freedom in the resin product and improving the mechanical properties. 【0106】 In a fifth aspect of the present invention, in any one of the first to fourth aspects, the phosphorus-based flame retardant (B) includes an intumescent flame retardant. The fifth aspect is even more effective from the viewpoint of enhancing flame retardancy because diffusion or heat transfer of decomposition products is suppressed during combustion of the resin composition. 【0107】 A sixth aspect of the present invention is any one of the first to fifth aspects, wherein the modified polyolefin resin (C) comprises a copolymer of an α-olefin and an unsaturated carboxylic acid. The sixth aspect is even more effective from the viewpoint of improving the compatibility between the thermoplastic resin (A) and the modified polyolefin resin (C) and the compatibility between the phosphorus-based flame retardant (B) and the modified polyolefin resin (C). 【0108】 A seventh aspect of the present invention is the sixth aspect, wherein the α-olefin has 15 or more carbon atoms. The seventh aspect is even more effective from the viewpoint of improving compatibility with the polyolefin resin as the thermoplastic resin (A). 【0109】 In the eighth aspect of the present invention, a resin product is produced by molding a product resin composition obtained by diluting the resin composition of any one of the first to seventh aspects with a material composition. In the eighth aspect, the resin composition of the above aspect is used as a masterbatch for a flame retardant, and therefore, the eighth aspect realizes a method for producing a resin product that is suitable for increasing the degree of freedom in the composition of a flame-retardant resin product. 【0110】A ninth aspect of the present invention is a method for producing a resin product, which is a flame retardant masterbatch obtained by pelletizing the resin composition of any one of the first to seventh aspects. The ninth aspect is even more effective from the viewpoint of improving handleability during use. 【0111】 In a tenth aspect of the present invention, the method for producing a resin product is the ninth aspect, wherein the arithmetic mean roughness Ra of the pellet surface is 5 μm or less. The tenth aspect is even more effective from the viewpoint of improving handleability during use. 【0112】 According to the present invention, it is possible to design and manufacture highly flame-retardant resin products with a high degree of freedom. This invention enables the substitution of metal products with lighter resin products, and is therefore expected to contribute to the achievement of, for example, Goal 9 of the Sustainable Development Goals (SDGs) proposed by the United Nations, which is related to building infrastructure for industry, innovation and infrastructure. 【0113】 The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. 【0114】 The present invention will be specifically described below with reference to examples. However, the present invention is not limited to the following examples. In the following examples, percentages are by mass unless otherwise specified. Evaluations were carried out on the following items. 【0115】 (1) Flame Retardancy (UL94) Using the obtained molded articles (1 / 16-inch test bars), flame retardancy was determined by a vertical flame test in accordance with the UL94 standard. The "total burning time" is the total flaming burning time during the burning test. The "number of drips" is the number of particles (drips) that fall from the test specimen during the burning test. The "rating" is a grade determined by the UL94 standard based on (1) the burning time of each test specimen after exposure to flame, (2) the total burning time of five samples, (3) the position at which each test specimen reaches flame, (4) ignition due to drips, and (5) red heat after the second exposure to flame. 【0116】(2) Tensile Properties The resulting molded articles (JIS K7139-A1 or JIS K6251-1, dumbbell test pieces) were used to measure the maximum tensile strength (MPa) and tensile elongation (%) in accordance with JIS K7161-1. 【0117】 (3) Flexural Properties The obtained molded article (JIS K7139-A1 dumbbell test piece) was cut into a length of 80 mm, and the flexural modulus (MPa) and maximum bending strength (MPa) were measured in accordance with JIS K7171. 【0118】 (4) Charpy Strength The obtained molded body was used to measure the Charpy impact strength (kJ / m) in accordance with JIS K7111-1:2012. ２ ) was measured. 【0119】 (5) Surface Resistivity Value The obtained resin composition pellets were hot-pressed at 200°C to obtain a sheet test piece having a size of 100 mm square and a thickness of 0.3 mm. The surface resistance value of this sheet test piece was measured using a surface resistance tester TRACK MODEL-100. 【0120】 (6) Surface Roughness The surface roughness of the pellet surfaces of the obtained resin composition was measured for the following items. The results are shown in Table 1. Here, 100 μm widths of locations (two locations each) other than the cut surfaces of three randomly selected pellets were measured using a hybrid laser microscope (OPTELICS HYBRID C3, manufactured by Lasertec Corporation), and the average value was used (in accordance with JIS B0601:2001 (ISO4278:1997)). Ra (μm) Arithmetic mean roughness Rp (μm) Maximum peak height Rv (μm) Maximum valley depth Rz (μm) Maximum height Rt (μm) Maximum cross-sectional height 【0121】 The following materials were used as raw materials. 【0122】<Thermoplastic resin (A)> A-1: ​​Polypropylene resin (manufactured by Japan Polypropylene Corporation, "Novatec (registered trademark) SA06GA", melt mass flow rate 60 g / 10 min). A-2: Polypropylene resin (manufactured by Japan Polypropylene Corporation, "Novatec (registered trademark) BC10HRF", melt mass flow rate 100 g / 10 min). A-3: Polypropylene resin (manufactured by Japan Polypropylene Corporation, "Novatec (registered trademark) BC05B", melt mass flow rate 50 g / 10 min). A-4: PP compound containing long glass fiber (GF) (manufactured by Japan Polypropylene Corporation, "Funcster (registered trademark) LR24A", (GF = 40%)). 【0123】 <Phosphorus-based flame retardant (B)> Phosphorus-based flame retardant composition (manufactured by ADEKA CORPORATION, "ADEKA STAB (registered trademark) FP-2500S", containing 50 to 60% piperazine pyrophosphate, 35 to 45% melamine pyrophosphate, and 3 to 6% zinc oxide based on the total mass of the phosphorus-based flame retardant composition). 【0124】 <Acid-modified polyolefin (PO) resin (C)> α-olefin-maleic anhydride copolymer (manufactured by Mitsubishi Chemical Corporation, "Diacarna (registered trademark) 30M", weight average molecular weight 7,800). 【0125】 Example 1 The following components were blended in the amounts shown below and mixed by hand blending. Then, using a φ30 mm co-rotating twin-screw extruder (model name "BT-30", manufactured by Plastics Engineering Research Institute Co., Ltd., L / D=30), the components were melt-kneaded at a screw rotation speed of 250 rpm and a cylinder temperature of 200°C to obtain a pellet-shaped resin composition 1. Here, "L / D" indicates the ratio of the screw length (L) to the diameter (D). Phosphorus-based flame retardant (B) 70% Acid-modified polyolefin resin (C) 3.5% Thermoplastic resin (A) A-1 Remainder 【0126】 The pellet-shaped resin composition 1 was hot-pressed at 200°C to obtain a sheet test piece, and the surface resistance value was measured. The result was 1×10 １０ The value was Ω·cm. 【0127】Next, the following components were mixed by hand blending in the amounts shown below. The resulting mixture was then injection molded using a fully electric injection molding machine "SE100DU" (Sumitomo Heavy Industries, Ltd.) under conditions of a cylinder temperature of 180 to 200°C (180-190-200-200-200°C) and a mold temperature of 80°C, to obtain Test Piece A, which is a dumbbell test piece according to JIS K7139-A1 mentioned above. Thermoplastic resin (A) A-4 63.0% Thermoplastic resin (A) A-1 8.0% Resin composition 1 29.0% 【0128】 Further, under the above-mentioned injection molding conditions, a test piece B having a length of 80.0 mm, a width of 10.0 mm, a thickness of 4 mm and a V-notch was obtained. Each of these test pieces A and B is referred to as a resin product 1. 【0129】 Example 2 Resin composition 2 was obtained in the same manner as resin composition 1, except that the amount of phosphorus-based flame retardant (B) was changed to 75% and the amount of acid-modified polyolefin resin (C) was changed to 4.6%. The surface roughness of pellet-shaped resin composition 2 was measured using a three-dimensional microscope. Test pieces A and B were obtained in the same manner as resin product 1, except that 27.0% resin composition 2 was used instead of 29.0% resin composition 1, and the amount of thermoplastic resin (A) A-1 was changed to 10.0%. These test pieces A and B are referred to as resin products 2. 【0130】 Example 3 Resin composition 3 was obtained in the same manner as resin composition 1, except that thermoplastic resin (A) A-2 was used instead of thermoplastic resin (A) A-1, the amount of phosphorus-based flame retardant (B) was changed to 78%, and the amount of acid-modified polyolefin resin (C) was changed to 3.90%. Also, test pieces A and B were obtained in the same manner as resin product 1, except that 26.0% of resin composition 3 was used instead of 29.0% of resin composition 1, and the amount of thermoplastic resin (A) A-1 was changed to 11.0%. These test pieces A and B are referred to as resin products 3. 【0131】Resin composition 4 was obtained in the same manner as in resin composition 1, except that thermoplastic resin (A) A-3 was used instead of thermoplastic resin (A) A-1, the amount of phosphorus-based flame retardant (B) was changed to 50%, and acid-modified polyolefin resin (C) was not added. The surface roughness of pelletized resin composition 4 was measured. 【0132】 Comparative Example 1 Resin composition 5 was obtained in the same manner as resin composition 1, except that the amount of phosphorus-based flame retardant (B) was changed to 60% and the amount of acid-modified polyolefin resin (C) was changed to 2.0%. In addition, test pieces A and B were obtained in the same manner as resin product 1, except that 33.5% of resin composition 5 was used instead of 29.0% of resin composition 1, and the amount of thermoplastic resin (A) A-1 was changed to 3.5%. These test pieces A and B are referred to as resin products 5, respectively. 【0133】 Comparative Example 2 Resin composition 6 was obtained in the same manner as resin composition 1, except that the amount of phosphorus-based flame retardant (B) was changed to 68% and the amount of acid-modified polyolefin resin (C) was changed to 3.4%. Test piece A and test piece B were obtained in the same manner as resin product 1, except that 30% of resin composition 6 was used instead of 29.0% of resin composition 1, and the amount of thermoplastic resin (A) A-1 was changed to 7%. These test pieces A and B are referred to as resin products 6, respectively. 【0134】 The compositions of the materials for resin compositions 1 to 6 are shown in Table 1. The measurement results of the surface roughness of the pellets of resin compositions 2, 4, and 5 are shown in Table 2. The compounding ratios during the production of resin products 1 to 3, 5, and 6, and the contents of each component after production are shown in Table 3. 【0135】 【0136】 【0137】 【0138】[Example 4] Thermoplastic resin (A) A-1 57.0% Resin composition 1 43.0% The above components were mixed by hand blending in the above amounts, and the resulting mixture was extruded into a sheet using a 25 mm single-screw extruder equipped with a T-die at a cylinder temperature of 180 to 200 ° C (180-190-190-200-200 ° C) and a rotation speed of 30 rpm. The molded product was taken up by a cooling roll, take-up machine, and winder downstream of the T-die to obtain a film with a thickness of 300 μm. The film was cut into the shape of the dumbbell-shaped No. 1 shape according to JIS K6251-1 described above, and test piece C was obtained. The obtained test piece C is referred to as resin product 7. 【0139】 [Example 5] Test piece C was obtained by producing in the same manner as resin product 7, except that the amount of thermoplastic resin (A) A-1 was changed to 60.0% and 40.0% of resin composition 2 was used instead of resin composition 1. The obtained test piece C is referred to as resin product 8. 【0140】 Example 6 A test piece C was obtained by producing in the same manner as Resin Product 7, except that the amount of Thermoplastic Resin (A) A-1 was changed to 61.5% and Resin Composition 3 was used in an amount of 38.5% instead of Resin Composition 1. The obtained test piece C is designated Resin Product 9. 【0141】 [Comparative Example 3] Thermoplastic resin (A) A-1 70.0% Phosphorus-based flame retardant (B) 30.0% Test piece C was obtained in the same manner as in resin product 7, except that the mixture of the above components was used. The obtained test piece C is referred to as resin product 10. 【0142】 Comparative Example 4 Thermoplastic resin (A) A-1 68.5% Phosphorus-based flame retardant (B) 30.0% Acid-modified polyolefin resin (C) 1.50% Test piece C was obtained in the same manner as in Resin product 7, except that a mixture of the above components was used. The obtained test piece C is designated Resin product 11. 【0143】 Comparative Example 5 A test piece C was obtained by producing in the same manner as Resin Product 7, except that the amount of thermoplastic resin (A) A-1 was changed to 50% and 50% of Resin Composition 5 was used instead of Resin Composition 1. The obtained test piece C is designated Resin Product 12. 【0144】Comparative Example 6 A test piece C was obtained in the same manner as in Resin Product 7, except that the amount of thermoplastic resin (A) A-1 was changed to 55.5% and 44.5% of Resin Composition 6 was used instead of Resin Composition 1. The obtained test piece C is designated Resin Product 13. 【0145】 For reference, test pieces A and B were obtained in the same manner as the resin product 1 in Example 1 described above, except that thermoplastic resin (A) A-1 was used instead of resin composition 1. These test pieces A and B were designated as resin products 14, respectively. 【0146】 [Evaluation] Using the above-mentioned test piece A, the above-mentioned flame retardancy, tensile properties, and bending properties of resin products 1 to 3, 5, and 6 were evaluated. In addition, the above-mentioned Charpy strength was evaluated using the above-mentioned test piece B. The results are shown in Table 4. 【0147】 【0148】 The aforementioned tensile properties of resin products 7 to 13 were evaluated using the aforementioned test piece C. The composition of the material of the resin products and the measurement results are shown in Table 5. 【0149】 【0150】 [Discussion] As shown in Tables 3 and 4, resin products 1 to 3 obtained using resin compositions 1 to 3 have excellent flame retardant properties while maintaining their mechanical properties. Furthermore, as shown in Tables 1 and 2, resin compositions 1 to 3 have a high content of phosphorus-based flame retardant. Therefore, for example, when resin compositions 1 to 3 are used as a flame retardant masterbatch, the amount of masterbatch required to achieve a desired flame retardant concentration in the diluted resin product can be reduced. This increases the degree of freedom in the composition of the resin product, making it possible to obtain resin products with composition ratios that were previously unrealizable. 【0151】Furthermore, as is clear from Table 5, resin products 7 to 13 all contain approximately 30% phosphorus-based flame retardant (B) and approximately 70% thermoplastic resin components. In other words, the compositions of these resin products are almost identical. Despite this, their tensile elongation is greater than that of resin products 10 and 11. As mentioned above, resin products 7 to 9 were obtained using resin compositions 1 to 3, whereas resin products 10 and 11 were obtained by directly mixing the materials without using resin compositions 1 to 3. This indicates that, despite the resin products having almost the same composition, using resin compositions 1 to 3 as a masterbatch can improve the tensile strength of the resulting resin composition (see Table 5). The reason for this is not clear at this stage, but it is thought to be due to the well-dispersed phosphorus-based flame retardant (B) and the high interfacial strength between the phosphorus-based flame retardant (B) and the thermoplastic resin (A). From the above, it can be seen that the tensile elongation of film-shaped resin products can be further improved by using a resin composition containing a higher concentration of phosphorus-based flame retardant (B) as a masterbatch. 【0152】 The present invention can be used to produce resin products that have high flame retardancy and a high degree of freedom in composition.

Claims

[Claim 1] It comprises a thermoplastic resin (A), a phosphorus-based flame retardant (B), and an acid-modified polyolefin resin (C), The thermoplastic resin (A) is a thermoplastic resin other than the acid-modified polyolefin resin (C), A resin composition wherein the proportion of the phosphorus-based flame retardant (B) is 70% by mass or more. [Claim 2] The resin composition according to claim 1, wherein the proportion of the phosphorus-based flame retardant (B) is 75% by mass or more. [Claim 3] The resin composition according to claim 1, wherein the proportion of the acid-modified polyolefin resin (C) is 10% by mass or less. [Claim 4] The resin composition according to claim 1, wherein the ratio of the acid-modified polyolefin resin (C) to the phosphorus-based flame retardant (B) is 15% by mass or less. [Claim 5] The resin composition according to claim 1, wherein the phosphorus-based flame retardant (B) comprises an intomescent flame retardant. [Claim 6] The resin composition according to claim 1, wherein the acid-modified polyolefin resin (C) comprises a copolymer of an α-olefin and an unsaturated carboxylic acid. [Claim 7] The resin composition according to claim 6, wherein the α-olefin has 15 or more carbon atoms. [Claim 8] A method for manufacturing a resin product, comprising molding a product resin composition obtained by diluting the resin composition according to any one of claims 1 to 7 with a material composition, thereby producing a resin product. [Claim 9] A flame retardant masterbatch, which is a pellet of the resin composition according to any one of claims 1 to 7. [Claim 10] The flame retardant masterbatch according to claim 9, wherein the arithmetic mean roughness Ra of the pellet surface is 5 μm or less.