Patent ID: 7751150
Filing Date: 2010-07-06
Classification: B29B,B29C,B29K,C08L,G11B

Abstract:
1. A ramp for a hard disk drive having an outgas level of 20 μg/g or less, the ramp being produced by the steps: forming a polyoxymethylene resin pellet by melt-kneading a polyoxymethylene resin with a colorant using an extruder while degassing under a reduced pressure of −0.06 MPa or less from one or more vents of the extruder; injection molding the formed polyoxymethylene resin pellet; solvent washing the molded article; and drying the washed molded article, wherein the polyoxymethylene resin has a composition comprising a hindered phenol of 0.05 to 0.5% by weight, a formaldehyde reactive nitrogen-containing polymer of 0.01 to 0.5% by weight and a fatty acid salt of an alkaline earth metal of 0.01 to 0.5% by weight, relative to a polyoxymethylene copolymer, wherein the colorant is at least one member selected from the group consisting of titanium oxide, a composite metal oxide, iron oxide, carbon black, calcium carbonate, wollastonite and ultrafine particles of carbon, and wherein an amount of chloride ion adhering to a surface of a polyacetal resin obtained by the melt-kneading step is 1 μg/g or less.