Abstract: A polyacetal resin composition and molded article having a high metallic gloss, small change in a color tone according to the viewing angle, high weld performance, and high mechanical properties can be provided in which the amount of formaldehyde to be produced in molding and recycle is suppressed, the mold deposit is improved, and the repeated impact resistance after aging is high. A polyacetal resin composition comprising: (A) 100 parts by mass of a polyacetal copolymer resin, and (B) 0.1 to 10 parts by mass of an aluminum pigment, the aluminum pigment having a coin-like or flake-like flat shape, a volume average particle size D50 of 15 to 50 ?m, an average surface roughness Ra of 20 to 50 nm, and an average height Rc of depressions and projections in a surface roughness curve of 80 to 200 nm.

Abstract: Provided is a polyacetal resin composition obtained from a raw material composition containing a polyacetal resin, a hydrazine derivative, and a compound for lowering the melting point of the hydrazine derivative, wherein a mixture of the hydrazine derivative and the compound satisfies both of the following conditions: T1<T2 and T1<T3, in which T1 is an apex temperature of an endothermic peak of the mixture having a maximum endothermic capacity by, with DSC, heating and cooling the mixture in accordance with a predetermined temperature program and then heating it at a predetermined rate until the mixture fuses; and T2 and T3 represent apex temperatures of endothermic peaks of the hydrazine derivative and the polyacetal resin having a maximum endothermic capacity, respectively by the similar treatment.

Abstract: A polyacetal resin composition and molded article having a high metallic gloss, small change in a color tone according to the viewing angle, high weld performance, and high mechanical properties can be provided in which the amount of formaldehyde to be produced in molding and recycle is suppressed, the mold deposit is improved, and the repeated impact resistance after aging is high. A polyacetal resin composition comprising: (A) 100 parts by mass of a polyacetal copolymer resin, and (B) 0.1 to 10 parts by mass of an aluminum pigment, the aluminum pigment having a coin-like or flake-like flat shape, a volume average particle size D50 of 15 to 50 ?m, an average surface roughness Ra of 20 to 50 nm, and an average height Rc of depressions and projections in a surface roughness curve of 80 to 200 nm.

Abstract: A shaped resin article comprising a polyamide (A) (comprising at least two different polyamide components), a polyphenylene ether (B) and a partially hydrogenated block copolymer (C) (obtained by partially hydrogenating a block copolymer comprising an aromatic vinyl polymer block and a conjugated diene polymer block) including a block copolymer (C-1) having a number average molecular weight of from 200,000 to 300,000, wherein (A) is present as a continuous phase in which (B) is dispersed to form a dispersed phase, and (C) is present in the continuous phase of (A) and/or the dispersed phase of (B), wherein the surface area of the polyamide (A) exposed on the overall surface of the shaped resin article is at least 80%, based on the surface area of the shaped resin article.

Abstract: Provided is a polyacetal resin composition obtained from a raw material composition containing a polyacetal resin, a hydrazine derivative, and a compound for lowering the melting point of the hydrazine derivative, wherein a mixture of the hydrazine derivative and the compound satisfies both of the following conditions: T1<T2 and T1<T3, in which T1 is an apex temperature of an endothermic peak of the mixture having a maximum endothermic capacity by, with DSC, heating and cooling the mixture in accordance with a predetermined temperature program and then heating it at a predetermined rate until the mixture fuses; and T2 and T3 represent apex temperatures of endothermic peaks of the hydrazine derivative and the polyacetal resin having a maximum endothermic capacity, respectively by the similar treatment.

Abstract: A ramp for hard discs which is obtained by molding a resin composition containing (A) a polyoxymethylene resin, and (B) at least one polymeric lubricant selected from the group consisting of (b-1) a polyolefin resin, and (b-2) a polymer obtained by polymerizing an isocyanate compound and a polyalkylene oxide, and which has an excellent sliding property and no deterioration of sliding property due to solvent washing.

Abstract: A ramp for a polyoxymethylene hard resin disk drive, which has an outgas level of not more than 20 ?g/g. The ramp for a polyoxymethylene resin hard disk drive comprises the steps of providing an extruder, melt kneading a polyoxymethylene resin with a colorant while degassing through one or more vents under a reduced pressure of ?0.06 Mpa or less to prepare polyoxymethylene resin pellets, and injection molding the polyoxymethylene resin pellets, washing the molding with a solvent, and drying the molding.

Abstract: A masterbatch is produced which is excellent in thermal stability by limiting the comonomer content and thermal stability of a polyoxymethylene copolymer, and further implements a method of feeding the polyoxymethylene resin and carbon in the extrusion step. Moreover, the composition containing the masterbatch retains mechanical properties (elastic modulus, impact resistance, and vibration fatigue characteristic), chemical resistance, and moldability and also has conducting capability.

Abstract: A ramp for a polyoxymethylene hard resin disk drive, which has an outgas level of not more than 20 ?g/g. The ramp for a polyoxymethylene resin hard disk drive comprises the steps of providing an extruder, melt kneading a polyoxymethylene resin with a colorant while degassing through one or more vents under a reduced pressure of ?0.06 Mpa or less to prepare polyoxymethylene resin pellets, and injection molding the polyoxymethylene resin pellets, washing the molding with a solvent, and drying the molding.

Abstract: A ramp for hard discs which is obtained by molding a resin composition containing (A) a polyoxymethylene resin, and (B) at least one polymeric lubricant selected from the group consisting of (b-1) a polyolefin resin, and (b-2) a polymer obtained by polymerizing an isocyanate compound and a polyalkylene oxide, and which has an excellent sliding property and no deterioration of sliding property due to solvent washing.

Abstract: A ramp for hard discs which is obtained by molding a resin composition containing (A) a polyoxymethylene resin, and (B) at least one polymeric lubricant selected from the group consisting of (b-1) a polyolefin resin, and (b-2) a polymer obtained by polymerizing an isocyanate compound and a polyalkylene oxide, and which has an excellent sliding property and no deterioration of sliding property due to solvent washing.

Abstract: A polyoxymethylene resin composition which comprises (A) a polyoxymethylene resin, (B) a polymer having at least one block made of a hydrogenated aromatic vinyl/conjugated diene random copolymer having the main dispersion peak of tan ? at 60° C. or below in the viscoelastic spectrum, and, if necessary, (C) a polyolefin resin with the provisos that the amount of (A) is 10 to 99.5 parts by weight and the total amount of (B) and (C) is 0.5 to 90 parts by weight, each per 100 parts by weight of the sum of (A), (B) and (C) and that the (B)/(C) weight ratio is 100/0 to 20/80.

Abstract: A shaped resin article comprising a polyamide (A) (comprising at least two different polyamide components), a polyphenylene ether (B) and a partially hydrogenated block copolymer (C) (obtained by partially hydrogenating a block copolymer comprising an aromatic vinyl polymer block and a conjugated diene polymer block) including a block copolymer (C-1) having a number average molecular weight of from 200,000 to 300,000, wherein (A) is present as a continuous phase in which (B) is dispersed to form a dispersed phase, and (C) is present in the continuous phase of (A) and/or the dispersed phase of (B), wherein the surface area of the polyamide (A) exposed on the overall surface of the shaped resin article is at least 80%, based on the surface area of the shaped resin article.

Abstract: A polyoxymethylene resin composition, which comprises (A) 100 parts by weight of polyoxymethylene resin, (B) 0.01 to 5 parts by weight of at least one polymer selected from homopolymers of N-vinylcarboxylic acid amides and copolymers of N-vinylcarboxylic acid amides and other vinyl monomers, and (C) 0.01 to 5 parts by weight of at least one compound selected from the group consisting of polyalkylene glycol and its derivatives, fatty acid amides, esters of alcohols and fatty acids, and esters of alcohols and dicarboxylic acids. Such a polyoxymethylene resin composition has a small amount of released formaldehyde gas during production and molding and suppressed scorching generation and is also distinguished in the water resistance and repeated impact resistance of the resulting moldings.

Abstract: Polyoxymethylene resin composition comprising 40 to 99.5 parts by weight of polyoxymethylene resin (A), and 0.5 to 60 parts by weight of resin consisting of a polyamide elastomer (B) and an acid-modified olefinic resin (C) having an acid modification rate of 0.05 to 15 wt. %, a ratio of (B)/(c) being in a range of 10/90 to 90/10 % by weight, has a much distinguished impact resistance and a good antistatic property, while maintaining the heat stability inherent to the polyoxymethylene resin, as compared with the conventional one, and is suitable for use in OA appliances, VTR appliances, music-image-information appliances, communication appliances, automobile interior and exterior furnishings and industrial sundries.

Abstract: A ramp for hard discs which is obtained by molding a resin composition containing (A) a polyoxymethylene resin, and (B) at least one polymeric lubricant selected from the group consisting of (b-1) a polyolefin resin, and (b-2) a polymer obtained by polymerizing an isocyanate compound and a polyalkylene oxide, and which has an excellent sliding property and no deterioration of sliding property due to solvent washing.

Abstract: A polyoxymethylene resin composition is provided which comprises a polyoxymethylene resin (A), a silicone compound-grafted polyolefinic resin (B-1) and a silicone compound (B-2), the amount of the silicone compound-grafted polyolefinic resin (B1) being 0.05 to 10 parts by weight on the basis of 100 parts by weight of the polyoxymethylene resin (A), and the ratio of (B1)/(B2) by weight in the composition being 99/1 to 70/30.

Abstract: A polyoxymethylene resin composition, which comprises (A) 100 parts by weight of polyoxymethylene resin, (B) 0.01 to 5 parts by weight of at least one polymer selected from homopolymers of N-vinylcarboxylic acid amides and copolymers of N-vinylcarboxylic acid amides and other vinyl monomers, and (C) 0.01 to 5 parts by weight of at least one compound selected from the group consisting of polyalkylene glycol and its derivatives, fatty acid amides, esters of alcohols and fatty acids, and esters of alcohols and dicarboxylic acids. Such a polyoxymethylene resin composition has a small amount of released formaldehyde gas during production and molding and suppressed scorching generation and is also distinguished in the water resistance and repeated impact resistance of the resulting moldings.

Abstract: Polyoxymethylene resin composition comprising 40 to 99.5 parts by weight of polyoxymethylene resin (A), and 0.5 to 60 parts by weight of resin consisting of a polyamide elastomer (B) and an acid-modified olefinic resin (C) having an acid modification rate of 0.05 to 15 wt. %, a ratio of (B)/(c) being in a range of 10/90 to 90/10% by weight, has a much distinguished impact resistance and a good antistatic property, while maintaining the heat stability inherent to the polyoxymethylene resin, as compared with the conventional one, and is suitable for use in OA appliances, VTR appliances, music-image- information appliances, communication appliances, automobile interior and exterior furnishings and industrial sundries.

Abstract: A polyoxymethylene resin composition comprising: (A) 50 to 99 parts by weight of a polyoxymethylene resin; (B) 1 to 50 parts by weight of a wollastonite having a volume-average particle diameter of 0.5 to 40 &mgr;m; (C) 0.1 to 10 parts by weight of at least one member selected from the group consisting of an ester of an alcohol and a fatty acid, an ester of an alcohol and a dicarboxylic acid, and a compound of a polyoxyalkylene glycol based on 100 parts by weight of the total amount of Component (A) and Component (B); and (D) 0.1 to 10 parts by weight of a polyolefin resin based on 100 parts by weight of the total amount of Component (A) and Component (B). The composition of the present invention provides a molded product which is excellent in resistance to friction and wearing, has high stiffness, repeated impact strength, and small molding strain, and is excellent in gear precision as compared with conventional compositions.