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.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 .Math.m or lower.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 .Math.m or lower.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 .Math.m or lower.

The present disclosure is directed to provide a resin composition which enables production of a molded product generating less formaldehyde and having excellent appearance and weather resistance, and also achieves suppression of mold deposit during molding. Presently disclosed is a polyacetal resin composition comprising 100 parts by mass of a polyacetal resin (A); and 0.1 to 10 parts by weight of an aluminum pigment (B), the aluminum pigment (B) containing 0.1 to 2.0 mass % of particles with a particle diameter of 1 μm or less with respect to a total amount of the aluminum pigment (B), and a volume average particle size of the aluminum pigment (B) being 3 to 40 μm.

The present disclosure is directed to provide a resin composition which enables production of a molded product generating less formaldehyde and having excellent appearance and weather resistance, and also achieves suppression of mold deposit during molding. Presently disclosed is a polyacetal resin composition comprising 100 parts by mass of a polyacetal resin (A); and 0.1 to 10 parts by weight of an aluminum pigment (B), the aluminum pigment (B) containing 0.1 to 2.0 mass % of particles with a particle diameter of 1 μm or less with respect to a total amount of the aluminum pigment (B), and a volume average particle size of the aluminum pigment (B) being 3 to 40 μm.

A polyacetal resin composition which is suppressed low in formaldehyde generation, while having high stiffness and high toughness. The resin is produced by a method including blending from 0.1 part by weight to 2 parts by weight (inclusive) of a polyacetal copolymer having a branched or crosslinked structure, which is a copolymer of a trioxane, a compound having from 3 to 4 (inclusive) cyclic ether units in each molecule and a compound having one cyclic ether unit in each molecule, per 100 parts by weight of a linear polyacetal copolymer which contains an oxymethylene unit as a main constituent, while containing, as a comonomer unit, an oxyalkylene unit at a ratio of from 0.4% by mole to 0.9% by mole (inclusive) relative to the constituents of the linear polyacetal copolymer, the linear polyacetal copolymer being obtained by copolymerization wherein a heteropolyacid or the like is used as a polymerization catalyst.

A polyacetal resin composition which is suppressed low in formaldehyde generation, while having high stiffness and high toughness. The resin is produced by a method including blending from 0.1 part by weight to 2 parts by weight (inclusive) of a polyacetal copolymer having a branched or crosslinked structure, which is a copolymer of a trioxane, a compound having from 3 to 4 (inclusive) cyclic ether units in each molecule and a compound having one cyclic ether unit in each molecule, per 100 parts by weight of a linear polyacetal copolymer which contains an oxymethylene unit as a main constituent, while containing, as a comonomer unit, an oxyalkylene unit at a ratio of from 0.4% by mole to 0.9% by mole (inclusive) relative to the constituents of the linear polyacetal copolymer, the linear polyacetal copolymer being obtained by copolymerization wherein a heteropolyacid or the like is used as a polymerization catalyst.

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 m.sup.2 per 100 g of the polyacetal resin (A); as well as an article molded therefrom.

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 m.sup.2 per 100 g of the polyacetal resin (A); as well as an article molded therefrom.