Asahi Kasei Kabushiki Kaisha

Asahi Kasei Chemicals Corporation

Junichi Tsuzuki

Sara Kusumoto

Takaaki Miyoshi

Yasukazu Shikano

Nozomi Inagaki

This invention relates to providing a resin composition and a resin molded article having sufficient mechanical properties and thermal properties, and also having excellent wear resistance and moldability when in use. This invention provides a cellulose nanofiber-containing aqueous dispersion including (A) cellulose nanofibers, (B) a surface treatment agent, and water. In one embodiment, (B) a surface treatment agent has an HLB value of 0.1 or greater but less than 8.0. This invention provides a dispersion liquid including (B) a surface treatment agent, (D) a binder component, and water, wherein (B) the surface treatment agent is a water-soluble polymer having a hydrophilic segment and a hydrophobic segment, and having a number average molecular weight of 200 to 30,000, and (D) the binder component is polyurethane. This invention provides a cellulose nanofiber resin composition including (A) cellulose nanofibers, (B) a surface treatment agent, and (F) a thermoplastic resin.

Cellulose nanofiber-containing aqueous dispersion

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.

Cellulose-containing gear

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 &#x3bc;m or lower.

A polyoxymethylene resin molded article comprising 100 parts by mass of a polyoxymethylene resin (A) and 0.1 to 5 parts by mass of a sliding agent (B), wherein four or more dispersion domains of the sliding agent (B) are present in a region of 1000 nm in depth from a surface of the molded article and 12000 nm in width, and the dispersion domain has an average minor diameter of 300 nm or less, and an average major diameter of 600 nm or more and 5000 nm or less.

Polyoxymethylene resin molded article, sliding member, and ramp for hard disk

The resin composition according to the present invention contains a polyacetal resin having a specific molecular weight distribution, a specific carbon black, and an alkaline metal wherein the contents of the carbon black and the alkaline metal are in specific ranges. The molded article according to the present invention contains the resin composition.

Polyacetal resin composition and molded article of the same

The resin molded article of the present invention comprises (B) 0.1 to 5 parts by mass of a sliding agent having a weight average molecular weight of 10,000 or less, and (C) 0.01 to 3 parts by mass of a coloring agent, based on (A) 100 parts by mass of a polyacetal resin, wherein a relative element concentration ratio between carbon and oxygen on a surface thereof [C/O] (atomic %) is 1.01 to 2.50.

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Tokyo, Japan

Junichi Tsuzuki