| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition containing a polishing-accelerating agent comprising aluminum oxalate, capable of giving a polished surface small in surface roughness and substantially not having a polished flaw and useful for low floatation type magnetic hard disks. SOLUTION: This composition comprises water, (A) α-alumina, and (C) a polishing-accelerating agent. Therein, the component C comprises aluminum oxalate. The contents of the aluminum oxalate and the component A are preferably 0.3-20wt.% and 2-20wt.%, respectively, based on the weight of the objective composition. The component A preferably has the maximum particle diameter of <=1.5μm and an average particle diameter of <=0.3μm. The composition preferably further contains alumina sol, a surfactant, etc. |
