MAGNETIC DISK

摘要

PURPOSE:To improve an electromagnetic conversion characteristic by incorporating an abrasive material having >=7 Mohs hardness and having average particle sizes ranging 0.25-0.75gamma (gamma=thickness of a magnetic layer on one face) and a fatty ester having <=10 deg.C m.p. into the magnetic layer. CONSTITUTION:The abrasive material having >=7 Mohs hardness has the average particle sizes ranging 0.25-0.75gamma when the thickness of the magnetic layer on one face is gamma. The amt. of the abrasive material to be used is in a 0.1-30pts. wt. range by 100pts.wt. magnetic powder. The fatty ester having <=10 deg.C m.p. is used for the lubricating agent to be used in combination with the abrasive material and is used in an amt. of >=5pts.wt. by 100pts.wt. magnetic powder. The thickness of the magnetic layer is made within a 0.3-2.5mum range. The electromagnetic conversion characteristic is thereby improved.