ABRADANT COMPOSITION FOR PRODUCING MAGNETIC RECORDING MEDIUM CARBON SUBSTRATE AND PRODUCTION OF MAGNETIC RECORDING MEDIUM CARBON SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To obtain an abradant composition excellent in dispersibility, capable of actualizing low surface roughness required for densification of a magnetic recording medium in a magnetic recording medium carbon substrate, containing water, an abradant and a specific abrasion promoter. ;SOLUTION: This abradant composition for producing a magnetic recording medium carbon substrate comprises (A) 50-99.85wt.% based on the composition of water, (B) 0.05-30wt.% of an alumina abradant (one having 0.001-6μm average particle diameter and ≤15μm maximum particle diameter) and (C) 0.05-20wt.% of an abrasion promoter composed of a sulfate such as aluminum sulfate, magnesium sulfate or zinc sulfate.;COPYRIGHT: (C)1997,JPO