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 μm 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 μm 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 μm or lower.

The present invention relates to isocyanate-terminated prepolymers based on polyoxymethylene-polyoxyalkylene block copolymers, to a process for their preparation, and to the use of these isocyanate-terminated prepolymers as isocyanate components in 1- and 2-component systems for coatings, adhesives and sealants.

A polyacetal resin composition capable of keeping the generation of formaldehyde from a molded article at a very low level and stably keeping mold deposits at a minimum during molding. The polyacetal resin composition includes at least (A) 100 parts by mass of a polyacetal polymer, (B) 0.01-0.50 parts by mass of an aliphatic carboxylic hydrazide, (C) 0.001-0.50 part by mass of a hydantoin compound having two hydrazinocarbonylalkyl groups, and (D) 0.001-0.30 part by mass of an alkaline earth metal salt of an aliphatic carboxylic acid. The total amount of (B) and (C) is 0.03-0.55 part by mass per 100 parts by mass of the (A) polyacetal polymer.

The present invention relates to a binder composition for metal powder injection molding, and more specifically, to a binder composition for metal powder injection molding, which can be promptly debound, facilitates the setting of flow conditions in an injection process, and enables the minimization of poor debinding such as swelling, carbonization of low-molecular-weight binders, and other internal defects, during a debinding process.

The binder composition for metal powder injection molding of the present invention contains 10 to 50 wt % of a high-viscosity polyoxymethylene polymer and 50 to 90 wt % of a low-viscosity polyoxymethylene polymer.

By containing polyoxymethylenes alone, which has been produced with different viscosities, without feeding of other monomers in the polymerization process of polyoxymethylene, the binder composition for metal powder injection molding according to the present invention is more economical through low manufacturing costs compared with a conventional technique in which the rate of decomposition by a gas-phase acid is controlled by viscosity adjustment in a polymerization process, and has excellent injection characteristics and debinding/sintering characteristics compared with a technique in which polyoxymethylene and other polymer resins, such as polyolefins and polyamides, are used together.

A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer, reinforcing fibers, and at least one tribological modifier. The tribological modifier, in one embodiment, can comprise a graft copolymer. The use of a graft copolymer has been found to unexpectedly and dramatically improve noise generation when tested against various substrates, especially glass substrates.

A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer, reinforcing fibers, and at least one tribological modifier. The tribological modifier, in one embodiment, can comprise a graft copolymer. The use of a graft copolymer has been found to unexpectedly and dramatically improve noise generation when tested against various substrates, especially glass substrates.

A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer, reinforcing fibers, and at least one tribological modifier. The tribological modifier, in one embodiment, can comprise a graft copolymer. The use of a graft copolymer has been found to unexpectedly and dramatically improve noise generation when tested against various substrates, especially glass substrates.

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 (μmol/g-POM) and Mc (μmol/g-POM) satisfy: 6.5<(Mn+Mc×8)<25, 0.5<Mn<7.0, and 0.0<Mc.