Polyoxymethylene resin molded article, sliding member, and ramp for hard disk
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsJunichi Tsuzuki, Yasukazu Shikano
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Abstract
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.
Claims16
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;
- wherein the sliding agent (B) comprises acid modified polyolefin having any of properties (1) to (4):
- (1) an acid value of 38 to 80 mg KOH/g,
- (2) an acid value of 2 to 25 mg KOH/g and a melt viscosity at 140° C. of 2900 mPa·s or less,
- (3) an acid value of 1 to 75 mg KOH/g and a weight average molecular weight of 100 to 2500,
- (4) an acid value of 1 to 75 mg KOH/g and a melt viscosity at 180° C. of 100 to 2500 mPa·s.
Dependencies are inferred from the claim text.