Polyacetal resin composition and molded article

Abstract

To provide a polyacetal resin composition that combines antistatic performance with superior tensile modulus and color tone properties.SOLUTION: There is provided a polyacetal resin composition comprising: (A) a polyacetal resin, (B) a hydrophilic resin, and (C) a nitrogen-containing compound, wherein, relative to 100 pts.mass of the polyacetal resin (A), the hydrophilic resin (B) is included in an amount of 2.0 pts.mass or more and 20.0 pts.mass or less, and the nitrogen-containing compound (C) is included in an amount of 0.01 to 1.0 pt.mass.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a polyacetal resin composition and a molded article. [Background technology]

[0002] Polyacetal resin has an excellent balance of mechanical strength, chemical resistance, and sliding properties, and is easy to process, so it is used widely as a representative engineering plastic, mainly in mechanical parts including electrical equipment, automobile parts, and other precision machines. However, since polyacetal resin itself is an electrical insulator, it is inferior in conductivity and in the ability to remove static electricity that is generated by the sliding of parts containing polyacetal resin and that polyacetal resin is charged with.

[0003] As a technique for imparting antistatic properties to polyacetal resin, for example, a method of adding a block polymer consisting of a block of polyolefin and a block of hydrophilic polymer to polyacetal resin (see, for example, Patent Document 1) and a method of kneading carbon black into polyacetal resin (see, for example, Patent Document 2) have been proposed, but there are problems in achieving both rigidity and color tone. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-224247 A [Patent Document 2] JP 2020-122126 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a polyacetal resin composition having antistatic properties, as well as good tensile modulus and color tone characteristics. [Means for solving the problem]

[0006] Means for Solving the Problems of the Prior Art As a result of intensive research, the present inventors have found that the above problems can be solved by blending a hydrophilic resin and a nitrogen-containing compound in predetermined amounts with a polyacetal resin, thereby completing the present invention.

[0007] That is, the present invention is as follows. [1] (A) component: polyacetal resin, (B) component: a hydrophilic resin; (C) component: a nitrogen-containing compound; Including, A polyacetal resin composition comprising 2.0 parts by mass or more and 20.0 parts by mass or less of the (B) component and 0.01 to 1.0 part by mass of the (C) component relative to 100 parts by mass of the (A) component. [2] The polyacetal resin composition according to [1], wherein a ratio (B / C) of the mass of the component (B) to the mass of the component (C) is 20 to 250. [3] The polyacetal resin composition according to [1] or [2], wherein the component (B) is polyvinylpyrrolidone. [4] The polyacetal resin composition according to any one of [1] to [3], comprising 5.0 parts by mass or more and 15.0 parts by mass or less of the (B) component relative to 100 parts by mass of the (A) component. [5] The polyacetal resin composition according to any one of [1] to [4], wherein the melting point of the component (C) is 200° C. or lower. [6] The polyacetal resin composition according to any one of [1] to [5], comprising 0.03 parts by mass or more and 0.5 parts by mass or less of the (C) component relative to 100 parts by mass of the (A) component. [7] The polyacetal resin composition according to any one of [1] to [6], wherein a ratio (B / C) of the mass of the component (B) to the mass of the component (C) is 30 to 200. [8] The polyacetal resin composition according to any one of [1] to [7], wherein the component (A) is a copolymer. [9] The polyacetal resin composition according to any one of [1] to [8], wherein the component (C) is at least one selected from the group consisting of an acrylamide polymer, a polyamide polymer, a hydrazide compound, an amino-substituted triazine compound, a urea compound, an amino acid compound, a guanidine compound, and an imide compound.

[10] A molded product using the polyacetal resin composition according to any one of [1] to [9]. Effect of the Invention

[0008] According to the present invention, it is possible to provide a polyacetal resin composition having antistatic properties, as well as good tensile elastic modulus and color tone characteristics. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention (hereinafter, sometimes referred to as the present embodiment) will be described in detail. The present invention is not limited to the following embodiment, and can be practiced in various modifications within the scope of the gist of the present invention.

[0010] In this specification, two or more embodiments may be combined in any combination.

[0011] The materials, components, compounds, resins, catalysts and solvents described herein may be used alone or in combination of two or more, unless otherwise specified.

[0012] In this specification, "hydrophilic" means the property of being soluble in water or gelling upon absorbing water.

[0013] (Polyacetal resin composition) The polyacetal resin composition of the present embodiment is (A) component: polyacetal resin, (B) component: a hydrophilic resin; (C) component: a nitrogen-containing compound; Including, The composition contains 2.0 parts by mass or more and 20.0 parts by mass or less of the component (B) and 0.01 to 1.0 part by mass of the component (C) relative to 100 parts by mass of the component (A).

[0014] The essential components and optional components contained in the polyacetal resin composition of the present embodiment will be described.

[0015] (A) Component: Polyacetal resin The polyacetal resin, which is the component (A), refers to a polymer having an oxymethylene group in the main chain. Examples of polyacetal resins include polyacetal copolymers obtained by copolymerizing a formaldehyde monomer or its cyclic oligomer with a cyclic ether or a cyclic formal; branched polyacetal copolymers obtained by copolymerizing a formaldehyde monomer or its cyclic oligomer with a monofunctional glycidyl ether; and polyacetal copolymers having a crosslinked structure obtained by copolymerizing a formaldehyde monomer or its cyclic oligomer with a polyfunctional glycidyl ether. In addition, for example, polyacetal homopolymers and polyacetal copolymers described in JP 2020-143256 A, and compounds having functional groups such as hydroxyl groups at both ends or one end, can also be used.

[0016] In the present embodiment, when the component (A) is a polyacetal copolymer, the content of the comonomer unit is not particularly limited, and when converted as the content per 1 mol of formaldehyde trimer (trioxane), the content of the comonomer unit is preferably 0.01 mol or more, more preferably 0.02 mol or more, and even more preferably 0.03 mol or more, and is preferably 0.10 mol or less, more preferably 0.07 mol or less, and even more preferably 0.05 mol or less.

[0017] From the viewpoint of thermal stability, the component (A) is preferably a polyacetal copolymer.

[0018] The number average molecular weight Mn of component (A) in this embodiment is not particularly limited and is, for example, 30,000 or more and 200,000 or less. In a preferred embodiment, Mn of component (A) is 50,000 or more, 100,000 or more, 150,000 or more, or 180,000 or more. In another preferred embodiment, Mn of component (A) is 200,000 or less, 180,000 or less, 150,000 or less, 100,000 or less, or 50,000 or less.

[0019] In a preferred embodiment, the content of the component (A) is 60 mass% or more, 70 mass% or more, 80 mass% or more, 90 mass% or more, or 95 mass% or more, based on 100 mass% of the polyacetal resin composition. In another preferred embodiment, the content of the component (A) is 98 mass% or less, 95 mass% or less, 90 mass% or less, 80 mass% or less, or 60 mass% or less, based on 100 mass% of the polyacetal resin composition.

[0020] The method for producing the component (A) is not particularly limited and can be a known method. For example, the method described in International Publication No. 2020 / 250895 can be used as the method for producing the component (A).

[0021] (B): Hydrophilic resin The hydrophilic resin (B) is preferably soluble in water from the viewpoint of antistatic properties. Here, "soluble in water" also includes the case where the resin gels upon absorbing water and then gradually dissolves in water. Examples of hydrophilic resins soluble in water include vinylpyrrolidone-vinyl acetate copolymer resin, polyvinyl butyral, polyvinyl acetal, polyvinylpyrrolidone, hydroxypropyl cellulose resin, polyvinyl acetate, ethyl cellulose resin, ethyl hydroxyethyl cellulose resin, vinyl methyl ether-maleic anhydride copolymer, ethylene vinyl alcohol resin, phenol resin, resorcinol resin, acrylic resin, etc. Among them, polyvinylpyrrolidone, which gels upon absorbing water, is preferred.

[0022] The content of the (B) component is 2.0 parts by mass or more and 20.0 parts by mass or less, relative to 100 parts by mass of the polyacetal resin. In a preferred embodiment, the content of the (B) component is 2.5 parts by mass or more, 5.0 parts by mass or more, 7.5 parts by mass or more, 10.0 parts by mass or more, 12.5 parts by mass or more, 15.0 parts by mass or more, or 17.5 parts by mass or more, relative to 100 parts by mass of the polyacetal resin. In another preferred embodiment, the content of the (B) component is 20.0 parts by mass or less, 17.5 parts by mass or less, 15.0 parts by mass or less, 12.5 parts by mass or less, 10.0 parts by mass or less, 7.5 parts by mass or less, or 5.0 parts by mass or less, relative to 100 parts by mass of the polyacetal resin.

[0023] In general, hydrophilic resins tend not to disperse well in polyacetal resins, and it is not easy to obtain the antistatic properties expected in the present application. In this embodiment, it is presumed that the dispersibility of the hydrophilic resin (B) can be improved by adding an appropriate amount of a nitrogen-containing compound (C) described below, and the effects of exhibiting good antistatic properties and mechanical properties, as well as suppressing discoloration during extrusion processing, can be exhibited.

[0024] (C) Component: Nitrogen-containing compound The nitrogen-containing compound which is the component (C) contributes to improving the dispersibility of the component (B) in the component (A) and suppressing yellowing of the polyacetal resin composition.

[0025] Examples of the nitrogen-containing compound include acrylamide polymers, polyamide polymers, hydrazide compounds, amino-substituted triazine compounds, urea compounds, amino acid compounds, guanidine compounds, and imide compounds.

[0026] Examples of the acrylamide polymer include a homopolymer of acrylamide, and a polymer of acrylamide and a monomer having a vinyl group other than acrylamide.

[0027] Examples of polyamide polymers include polyamide 6, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6 / 612, polyamide 6 / 66 / 610, polyamide 6I, and polyamide 6I / 6T.

[0028] Examples of the hydrazide compounds include hydrazine; hydrazine hydrate; carboxylic acid monohydrazides such as succinic acid monohydrazide, glutaric acid monohydrazide, adipic acid monohydrazide, pimelic acid monohydrazide, suberic acid monohydrazide, azelaic acid monohydrazide, and sebacic acid monohydrazide; saturated aliphatic carboxylic acid dihydrazides such as oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, pimelic acid dihydrazide, suberic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, and dodecanedioic acid dihydrazide; maleic acid dihydrazide, fumaric acid dihydrazide, Examples of the dihydrazides include monoolefinically unsaturated dicarboxylic acids such as itaconic acid dihydrazide; aromatic carboxylic acid dihydrazides such as isophthalic acid dihydrazide, phthalic acid dihydrazide, and 2,6-naphthalenedicarbodihydrazide; dihydrazides of pyromellitic acid; trihydrazides such as trimer acid trihydrazide, cyclohexanetricarboxylic acid trihydrazide, benzenetricarboxylic acid trihydrazide, nitrilotriacetic acid trihydrazide, and citric acid trihydrazide; and tetrahydrazides such as pyromellitic acid tetrahydrazide, naphthoic acid tetrahydrazide, ethylenediaminetetraacetic acid tetrahydrazide, and 1,4,5,8-naphthoic acid tetrahydrazide.

[0029] Examples of the amino-substituted triazine compound include guanamine, melamine, N-butylmelamine, N-phenylmelamine, N,N-diphenylmelamine, N,N-diallylmelamine, N,N',N"-triphenylmelamine, N,N',N"-trimethylolmelamine, benzoguanamine, 2,4-diamino-6-methyl-sym-triazine, 2,4-diamino-6-butyl-sym-triazine, 2,4-diamino-6-benzyloxy-sym-triazine, 2,4-diamino-6-butoxy-sym-triazine, 2,4-diamino-6-cyclohexyl-sym-triazine, 2,4-diamino-6-chloro-sym-triazine, 2,4-diamino-6-mercapto-sym-triazine, amerine (N,N,N',N'-tetracyanoethylbenzoguanamine), and initial polycondensates of these with formaldehyde.

[0030] Examples of urea compounds include condensates of urea such as biurea, biuret, and form nitrogen with formaldehyde, polyalkylene or arylene ureas such as polynonamethylene urea, hydantoins, crotylidenediurea, acetylene urea, ethylene urea, mono-, di-, tri-, or tetraalkoxymethylglycoluril such as mono-, di-, tri-, or tetramethoxymethylglycoluril, cyanuric acid, isocyanuric acid, uric acid, and urazole.

[0031] Examples of hydantoins include hydantoin, 5-methylhydantoin, 5-ethylhydantoin, 5-isopropylhydantoin, 5-phenylhydantoin, 5-benzylhydantoin, 5,5-dimethylhydantoin, 5,5-pentamethylenehydantoin, 5-methyl-5-phenylhydantoin, 5,5-diphenylhydantoin, 5-(o-, m-, or p-hydroxyphenyl)hydantoin, 5-(o-, m-, or p-aminophenyl)hydantoin, allantoin, 5-methylallantoin, and metal salts such as Al salts of allantoin, such as allantoin dihydroxyaluminum salt.

[0032] Examples of amino acid compounds include glycine, alanine, arginine, and glutamine.

[0033] Examples of guanidine compounds include glycocyamine, guanoline, glycocyamidine, oxalylguanidine, creatinine, iminourazol, malonylguanidine, and mesoxalylguanidine.

[0034] Examples of the imide-based compound include phthalimide, trimellitic imide, pyromellitic imide, and pyromellitic diimide.

[0035] In a preferred embodiment, component (C) includes one or more selected from the group consisting of an acrylamide polymer, a polyamide polymer, a hydrazide compound, an amino-substituted triazine compound, a urea compound, an amino acid compound, a guanidine compound, and an imide compound. In another preferred embodiment, component (C) is one or more selected from the group consisting of an acrylamide polymer, a polyamide polymer, a hydrazide compound, an amino-substituted triazine compound, a urea compound, an amino acid compound, a guanidine compound, and an imide compound.

[0036] In a preferred embodiment, the melting point of component (C) is 200° C. or lower. In another preferred embodiment, the melting point of component (C) is 150 to 200° C. In a preferred embodiment, the melting point of component (C) is 150° C. or higher, 160° C. or higher, 170° C. or higher, 180° C. or higher, or 190° C. or higher. In another preferred embodiment, the melting point of component (C) is 200° C. or lower, 190° C. or lower, 180° C. or lower, 170° C. or lower, or 160° C. or lower.

[0037] From the viewpoint of improving the dispersibility of component (B), the melting point of component (C) is preferably equal to or lower than the melt processing temperature of component (A).

[0038] The content of the nitrogen-containing compound (C) is 0.01 parts by mass or more and 1.0 parts by mass or less relative to 100 parts by mass of the polyacetal resin. In a preferred embodiment, the content of the nitrogen-containing compound (C) is 0.01 parts by mass or more, 0.03 parts by mass or more, 0.05 parts by mass or more, 0.10 parts by mass or more, 0.20 parts by mass or more, 0.30 parts by mass or more, 0.40 parts by mass or more, 0.50 parts by mass or more, 0.60 parts by mass or more, 0.70 parts by mass or more, 0.80 parts by mass or more, or 0.90 parts by mass or more relative to 100 parts by mass of the polyacetal resin. In another preferred embodiment, the content of the component (C) is 1.0 part by mass or less, 0.90 parts by mass or less, 0.80 parts by mass or less, 0.70 parts by mass or less, 0.60 parts by mass or less, 0.50 parts by mass or less, 0.40 parts by mass or less, 0.30 parts by mass or less, 0.20 parts by mass or less, or 0.10 parts by mass or less, per 100 parts by mass of the polyacetal resin.

[0039] The ratio (B / C) of the mass of the component (B) to the mass of the component (C) may be appropriately adjusted and is, for example, 20 to 250. In a preferred embodiment, the mass ratio (B / C) is 20 or more, 30 or more, 50 or more, 100 or more, 150 or more, or 200 or more. In another preferred embodiment, the mass ratio (B / C) is 250 or less, 200 or less, 150 or less, 100 or less, 75 or less, 50 or less, or 30 or less.

[0040] Other Additives In addition to the essential components (A), (B) and (C), the polyacetal resin composition of the present embodiment may contain known additives such as antioxidants, formic acid scavengers, weather stabilizers, release agents, lubricants, conductive agents, thermoplastic resins, thermoplastic elastomers, dyes and pigments, inorganic fillers, and organic fillers. For example, those described in International Publication No. 2020 / 250895 can be used.

[0041] The content of the other additives may be appropriately adjusted. For example, when other additives are used, the content is 0.1 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the polyacetal resin.

[0042] Method for producing polyacetal resin composition The method for producing the polyacetal resin composition of the present embodiment is not particularly limited, and For example, it can be obtained by kneading (A) a polyacetal resin, (B) a hydrophilic resin, (C) a component, and, if necessary, other additives. Alternatively, a pelletized polyacetal resin composition (hereinafter referred to as "polyacetal resin pellets" or "pellets") may be obtained.

[0043] The kneader, kneading temperature, drying method for polyacetal resin pellets, drying temperature, drying time, etc. can be those described in, for example, WO 2020 / 250895.

[0044] (molded product) The molded article of this embodiment is a molded article using the polyacetal resin composition of this embodiment. The method for molding the polyacetal resin composition is not particularly limited, and a known molding method, for example, the molding method described in International Publication No. 2020 / 250895 can be used.

[0045] Uses of molded products The molded article of the present embodiment can be used as a molded article for various applications. Examples of applications of the molded article of the present embodiment include mechanical parts such as gears, cams, sliders, levers, shafts, bearings, and guides, resin parts by outsert molding or resin parts by insert molding (chassis, tray, side plate parts), parts for printers or copiers, parts for digital cameras or digital video devices, parts for music, video, or information devices, parts for communication devices, parts for electrical devices, and parts for electronic devices. EXAMPLES

[0046] Hereinafter, the present embodiment will be described with reference to specific examples and comparative examples, but the present embodiment is not limited to the following examples.

[0047] The measurement and evaluation methods used in the examples and comparative examples are shown below.

[0048] <Antistatic properties> The obtained pellets were molded into 130mm x 110mm x 3mm test pieces for evaluating physical properties using a 5-ounce molding machine (manufactured by Toshiba Machine Co., Ltd., product name "IS-100GN") set at a cylinder temperature of 200°C, under conditions of a mold temperature of 77°C and a cooling time of 30 seconds. Using this test piece, the surface resistivity was measured in accordance with JIS K6911 using a digital ultra-high resistance / microcurrent meter 8340A (manufactured by ADC).

[0049] <Mechanical property evaluation> The obtained pellets were molded into ISO dumbbell test pieces for evaluating physical properties using a 5-ounce molding machine (manufactured by Toshiba Machine Co., Ltd., product name "EC100SX") with a cylinder temperature set to 205°C under conditions of a mold temperature of 90°C, an injection time of 35 seconds, and a cooling time of 15 seconds. The tensile modulus of elasticity of this test piece was measured in accordance with ISO527.

[0050] <Evaluation of color characteristics> The yellowness (b value) of approximately 20 g of polyacetal resin pellets was measured using a Nippon Denshoku Industries Co., Ltd. color difference meter ZE2000 with a halogen lamp as a light source.

[0051] The raw material components used in the examples and comparative examples are shown below.

[0052] (A) Polyacetal resin A jacketed, self-cleaning, two-screw polymerization machine (L / D=8) that allows the passage of a heat transfer medium was adjusted to 80°C. Then, trioxane was fed at 4 kg / hr, 1,3-dioxolane was fed at 42.8 g / hr (0.039 mol per mol of trioxane) as a comonomer, and methylal (water content 1.3%, methanol content 0.99%) was fed at 1.50 × 10 per mol of trioxane as a chain transfer agent. -3 In addition, 1.5×10 mol of boron trifluoride di-n-butyl etherate was added as a polymerization catalyst to 1 mol of trioxane. -5mol was continuously added to carry out polymerization. The polyacetal copolymer discharged from the polymerization machine was put into a 0.1% aqueous solution of triethylamine to deactivate the polymerization catalyst. The polyacetal copolymer with the deactivated polymerization catalyst was separated and recovered by filtration using a centrifuge. Next, 1 part by mass of an aqueous solution containing choline hydroxide formate (triethyl-2-hydroxyethylammonium formate) as a quaternary ammonium compound was added to 100 parts by mass of the polyacetal copolymer, mixed uniformly, and then dried at 120°C. The amount of choline hydroxide formate added was adjusted by adjusting the concentration of the choline hydroxide formate in the aqueous solution containing the choline hydroxide formate added. The amount of choline hydroxide formate added was 20 ppm by mass in terms of the amount of nitrogen derived from the choline hydroxide formate. The dried polyacetal copolymer was fed to a vented twin-screw extruder, and 0.5 parts by mass of water was added to 100 parts by mass of the polyacetal copolymer molten in the extruder. The unstable terminals were decomposed and removed at an extruder set temperature of 200°C and a residence time of 7 minutes. The polyacetal copolymer from which the unstable terminals had been decomposed was devolatilized under a vent vacuum of 20 Torr, extruded as strands from the extruder die, and pelletized. Thus, a pelletized polyacetal copolymer (weight average molecular weight Mw=32,000, number average molecular weight Mn=180,000, MFR=9.3g / 10min) was obtained.

[0053] (B) Hydrophilic resin B1: Polyvinylpyrrolidone (K-30) B2: Polyvinylpyrrolidone (K-90)

[0054] (C) Nitrogen-containing compounds C1: Sebacic acid dihydrazide (melting point 186°C) C2: Adipic dihydrazide (melting point 180°C) C3: Benzoguanamine (melting point 228°C)

[0055] Example 1 A mixture was obtained by uniformly mixing 100 parts by mass of pelletized polyacetal copolymer as component (A), 2.5 parts by mass of polyvinylpyrrolidone (B1) as component (B), and 0.1 parts by mass of sebacic acid dihydrazide (C1) as nitrogen-containing compound (C) using a Henschel mixer. This mixture was fed from the top feed port of a 40 mm vented twin-screw extruder with L (screw length) / D (screw inner diameter) = 48 set at 200 ° C, melt-kneaded at a screw rotation speed of 200 rpm, vent vacuum degree of -0.08 MPa, and discharge rate of 50 kg / hr, pelletized by a hot cut method at the extruder die outlet, and then the pellets were put into warm water adjusted to 40 ° C, stirred for a certain period of time, and then dehydrated using a centrifuge, put into a fluidized bed hot air dryer, and dried at a hot air temperature of 100 ° C for 3 hours to obtain polyacetal resin pellets. The molded pieces of the obtained polyacetal resin pellets were evaluated for antistatic properties, mechanical properties (tensile modulus of elasticity) and color characteristics. The evaluation results are shown in Table 1.

[0056] Examples 2 to 9, Comparative Examples 1 to 4 Polyacetal resin pellets were obtained in the same manner as in Example 1, except that the types and amounts of each component were changed as shown in Table 1. Measurements and evaluations were then carried out in the same manner as in Example 1.

[0057] [Table 1]

[0058] As shown in Table 1, it was found that the pellets, which are molded articles made of the polyacetal resin compositions obtained in Examples 1 to 9, have antistatic properties and can achieve both good tensile modulus and color characteristics. On the other hand, the molded articles made of the polyacetal resin compositions obtained in Comparative Examples 1 to 4 were insufficient in antistatic properties and could not achieve both good mechanical properties and color characteristics. [Industrial Applicability]

[0059] According to the present invention, it is possible to provide a polyacetal resin composition having antistatic properties, as well as good tensile elastic modulus and color tone characteristics.

Claims

1. Component (A): polyacetal resin, (B) component: a hydrophilic resin; (C) component: a nitrogen-containing compound; Including, The polyacetal resin composition comprises 2.0 parts by mass or more and 20.0 parts by mass or less of the (B) component and 0.01 to 1.0 part by mass of the (C) component relative to 100 parts by mass of the (A) component.

2. 2. The polyacetal resin composition according to claim 1, wherein a ratio (B / C) of the mass of the component (B) to the mass of the component (C) is 20 to 250.

3. The polyacetal resin composition according to claim 1 or 2, wherein the component (B) is polyvinylpyrrolidone.

4. The polyacetal resin composition according to claim 1 or 2, comprising 5.0 parts by mass or more and 15.0 parts by mass or less of the (B) component relative to 100 parts by mass of the (A) component.

5. The polyacetal resin composition according to claim 1 or 2, wherein the melting point of the component (C) is 200° C. or lower.

6. The polyacetal resin composition according to claim 1 or 2, comprising 0.03 parts by mass or more and 0.5 parts by mass or less of the (C) component relative to 100 parts by mass of the (A) component.

7. 3. The polyacetal resin composition according to claim 1, wherein a ratio (B / C) of the mass of the component (B) to the mass of the component (C) is 30 to 200.

8. The polyacetal resin composition according to claim 1 or 2, wherein the component (A) is a copolymer.

9. 3. The polyacetal resin composition according to claim 1, wherein the component (C) is at least one selected from the group consisting of an acrylamide polymer, a polyamide polymer, a hydrazide compound, an amino-substituted triazine compound, a urea compound, an amino acid compound, a guanidine compound, and an imide compound.

10. A molded product using the polyacetal resin composition according to claim 1.

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