Abstract: To provide a resin composition that contains a core-shell elastomer and has excellent flexibility, high weld elongation, and excellent impact resistance, and a molded article formed from the resin composition. A resin composition comprising a polyacetal resin (A) and a core-shell elastomer (B), wherein the core-shell elastomer (B) has a crosslinking index in a range of 0.24 to 0.30, the core-shell elastomer (B) has an average secondary particle size of 10 to 250 nm in the polyacetal resin (A), and an amount of element potassium in the core-shell elastomer (B) is more than 0% by mass and not more than 0.05% by mass.

Abstract: A polyacetal resin composition; a metal resin composition; and a method for producing a polyacetal resin composition are provided. The polyacetal resin composition contains 100 parts by weight of a polyacetal resin (A) and 0.1 to 0.9 part by weight of a fatty acid metal salt (B) having a weight loss rate of 20% by weight of more, the weight loss rate being the ratio of weight loss after the fatty acid metal salt is heated from room temperature to 200° C. at a rate of 200° C./minute in the air at atmospheric pressure and is subsequently held at 200°° C. for 60 minutes.

Abstract: A polyacetal resin composition includes: 100 parts by weight of a polyacetal resin (A), 0.2 to 10.0 parts by weight of a fatty acid metal salt (B), and 0.2 to 10.0 parts by weight of a fatty acid ester compound (C), wherein the fatty acid metal salt (B) is fatty acid zinc, fatty acid magnesium, or a combination thereof, and the fatty acid ester compound (C) is a compound having 3 or more ester bonds in a single molecule thereof.

Abstract: The present invention provides a polyacetal resin composition, which comprises a polyacetal resin, and which further comprises the following (A), (B) and (C), with respect to 100 parts by weight of the polyacetal resin: (A) 0.05 to 5.5 parts by weight of a low-density polyethylene having a melt flow rate of 1.0 to 50 g/10 minutes (190° C., 2.16 kg), (B) 0.05 to 2.0 parts by weight of a fatty acid compound (excluding calcium stearate), and (C) 0.001 to 1.0 part by weight of a layered double hydroxide represented by the following general formula (1): [(M2+)x(M3+)y(OH)2(x+y)](An?)x/n?(H2O) (1) (wherein, in the general formula (1), M2+ represents a divalent metal ion, M3+ represents a trivalent metal ion, An? represents an n-valent anion, wherein one or more of the anions are contained in the layered double hydroxide, x represents a number in the range of 0<x? 6.0, n represents 1, 2, or 3, and y and z each represent a number of 0 or greater).

Abstract: The present invention provides a polyacetal resin composition that is used by being kneaded with metal powders, said polyacetal resin composition comprising 100 parts by weight of a polyacetal resin (A) and 0.15 to 10.0 parts by weight of a fatty acid metal salt (B), wherein the fatty acid metal salt (B) is fatty acid zinc, fatty acid magnesium, or a combination thereof.

Abstract: An oxymethylene-copolymer manufacturing method includes: polymerizing a polymerization raw material containing trioxane and a comonomer in the presence of an acid catalyst in a quantity that is 1.0×10?8 moles to 5.0×10?6 moles with respect to 1 mole of trioxane; adding a hydroxylamine compound represented by general formula (1) (in the formula, R1 and R2 are, independently of each other, a hydrogen atom or an organic group having 1-20 carbon atoms) to a reaction product obtained during the polymerizing of the polymerization raw material at 50-5000 times the quantity of the acid catalyst, in terms of the molar quantity, and mixing the hydroxylamine compound with the reaction product; and subjecting the mixture of the reaction product and the hydroxylamine compound, which is obtained during the adding of the hydroxylamine compound, to an additional melt-kneading.

Abstract: An oxymethylene copolymer resin composition, which includes (i) an oxymethylene copolymer, (ii) a derivative of an aryl boron fluoride compound, and (iii) a layered double hydroxide; and a method for producing the same.

Abstract: The present invention provides a method for producing an oxymethylene copolymer resin composition, comprising: adding to an oxymethylene copolymer (A), an Mn micromole of an amine-substituted triazine compound (B) per gram of the oxymethylene copolymer (A), an Mc micromole of a choline hydroxide (C) per gram of the oxymethylene copolymer (A), and 0.05 to 1.1 parts by weight of an antioxidant (D) with respect to 100 parts by weight of the oxymethylene copolymer (A), and melt kneading a mixture of the oxymethylene copolymer (A), amine-substituted triazine compound (B), the choline hydroxide (C), and the antioxidant (D), wherein Mn (?mol/g-POM) and Mc (?mol/g-POM) satisfy: 6.5<(Mn+Mc×8)<25, 0.5<Mn<7.0, and 0.0<Mc.

Abstract: A method for producing a polyacetal fiber that presents an improved whiteness unevenness is provided. According to one embodiment, there is provided a polyacetal fiber production method that yields a polyacetal fiber using an oxymethylene copolymer having a melt index, at 190° C. under a load of 2.16 kg, of 5-60 g/10 min, wherein the production method includes taking off the polyacetal fiber from the discharge nozzle of a spinning apparatus, and drawing the taken-off polyacetal fiber. The tensile elongation E1 of the polyacetal fiber after the taking off is 20%-500%; the tensile elongation E2 of the polyacetal fiber after the drawing is 10%-100%; E1?E2; and the single fiber thickness of the polyacetal fiber after the drawing is 0.7-5.0 denier.

Abstract: A method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and where: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.

Abstract: The present invention addresses the problem of providing a method for producing an oxymethylene copolymer, which is capable of producing an oxymethylene copolymer having a high molecular weight with high yield and high economic efficiency. This problem is able to be solved by a method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and wherein: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.

Abstract: The present invention provides a polyacetal resin composition, which comprises a polyacetal resin, and which further comprises the following (A), (B) and (C), with respect to 100 parts by weight of the polyacetal resin: (A) 0.05 to 5.5 parts by weight of a low-density polyethylene having a melt flow rate of 1.0 to 50 g/10 minutes (190° C., 2.16 kg), (B) 0.05 to 2.0 parts by weight of a fatty acid compound (excluding calcium stearate), and (C) 0.001 to 1.0 part by weight of a layered double hydroxide represented by the following general formula (1): [(M2+)x(M3+)y(OH)2(x+y)](An·)x/u·z(H2O) (1) (wherein, in the general formula (1), M2+ represents a divalent metal ion, M3+ represents a trivalent metal ion, An- represents an n-valent anion, wherein one or more of the anions are contained in the layered double hydroxide, x represents a number in the range of 0 < x ? 6.0, n represents 1, 2, or 3. and y and z each represent a number of 0 or greater).

Abstract: An oxymethylene copolymer resin composition, which includes (i) an oxymethylene copolymer, (ii) a derivative of an aryl boron fluoride compound, and (iii) a layered double hydroxide; and a method for producing the same.

Abstract: The present invention provides a method for producing an oxymethylene copolymer resin composition, comprising: adding to an oxymethylene copolymer (A), an Mn micromole of an amine-substituted triazine compound (B) per gram of the oxymethylene copolymer (A), an Mc micromole of a choline hydroxide (C) per gram of the oxymethylene copolymer (A), and 0.05 to 1.1 parts by weight of an antioxidant (D) with respect to 100 parts by weight of the oxymethylene copolymer (A), and melt kneading a mixture of the oxymethylene copolymer (A), amine-substituted triazine compound (B), the choline hydroxide (C), and the antioxidant (D), wherein Mn (?mol/g-POM) and Mc (?mol/g-POM) satisfy: 6.5<(Mn+Mc×8)<25, 0.5<Mn<7.0, and 0.0<Mc.

Abstract: The present invention provides a method for manufacturing a polyacetal fiber in which whiteness irregularity is improved. One embodiment of the present invention provides a method for manufacturing a polyacetal fiber, wherein the method includes a discharge step, a takeup step, a stretching step, and a winding step, the steps being continuously performed, an oxymethylene copolymer being used as the raw material of the polyacetal fiber, the oxymethylene copolymer having an oxymethylene unit and an oxyethylene unit, the content of the oxyethylene unit being 0.5-7.0 moles to 100 moles of the oxymethylene unit, the roller temperature of a stretching unit used in the stretching step being 130-155° C., and operation parameters of the method being set so as to satisfy a prescribed numerical formula.

Abstract: The purpose of the present invention is to provide: a polyacetal resin composition which is excellent in terms of impact resistance, thermal stability, and releasability; and a process for producing the polyacetal resin composition. The polyacetal resin composition comprises 100 parts by mass of a polyacetal resin (A) in which the molecular chain has neither a crosslink nor a branch therein, 0.01-10.0 parts by mass of an antioxidant (B), 0.01-5.0 parts by mass of a nitrogenous compound (C), and 0.05-1.0 parts by mass of a fatty acid amide (D), and has a melt index, as measured in accordance with ISO 1133, of 0.5-1.5 g/10 min. A process for producing the polyacetal resin compositions is also provided.

Abstract: It has been desired to develop a method for producing an oxymethylene polymer, by which an oxymethylene polymer having a high polymerization degree can be produced with high efficiency while suppressing increase in the amount of generation of an odor. Further, it has been desired to develop an oxymethylene polymer resin composition, wherein generation of an odor at the time of molding or after molded to obtain a molded body is suppressed. The present invention provides a method for producing an oxymethylene polymer, wherein the oxymethylene polymer is produced by polymerizing a cyclic oligomer of formaldehyde, and wherein a boron trifluoride compound and an aryl fluoride boron compound are used as polymerization catalysts. The present invention also provides an oxymethylene polymer resin composition containing an oxymethylene polymer and a derivative of an aryl fluoride boron compound.

Abstract: The present invention provides a polyacetal resin composition comprising (A) a polyacetal resin and (B) zinc oxide, wherein the content of oxyalkylene constituent units other than an oxymethylene group in the polyacetal resin (A) is 0.1% by mass or more, and wherein the total surface area of the zinc oxide (B) in the polyacetal resin composition is 0.1 to 40 m2 per 100 g of the polyacetal resin (A); as well as an article molded therefrom.

Abstract: It has been desired to develop a method for producing an oxymethylene polymer, by which an oxymethylene polymer having a high polymerization degree can be produced with high efficiency while suppressing increase in the amount of generation of an odor. Further, it has been desired to develop an oxymethylene polymer resin composition, wherein generation of an odor at the time of molding or after molded to obtain a molded body is suppressed. The present invention provides a method for producing an oxymethylene polymer, wherein the oxymethylene polymer is produced by polymerizing a cyclic oligomer of formaldehyde, and wherein a boron trifluoride compound and an aryl fluoride boron compound are used as polymerization catalysts. The present invention also provides an oxymethylene polymer resin composition containing an oxymethylene polymer and a derivative of an aryl fluoride boron compound.

Abstract: Polyacetal fibers having excellent spinning stability and uniform appearance and production methods thereof have been awaited. According to the invention, a polyacetal fiber, comprising 0.05 to 1.3 parts by mass of an inorganic filler with respect to 100 parts by mass of a polyacetal resin, in which the inorganic filler has a primary average particle size of more than 0.5 ?m and 10 ?m or less, and the polyacetal fiber has a melt flow index of 15 to 45 g/10 min, is provided.