Patent ID: 9611406
Date: 2017-04-04
CPC Classifications: B24B,C09G,C09K,H01L

Claim:
1. A method comprising: mixing abrasive grains with water to prepare a polishing composition; and adding an organic alkali to the polishing composition such that the organic alkali is contained in the polishing composition in an amount of 100 mmol or less per kilogram of the abrasive grains in the polishing composition, wherein the abrasive grains each have a surface with a plurality of protrusions, parts of the abrasive grains have larger particle diameters than a volume-based average particle diameter of the abrasive grains, and an average of values respectively obtained by dividing a height of each protrusion on a surface of each abrasive grain belonging to the parts of the abrasive grains by a width of a base portion of the same protrusion is 0.170 or more, and protrusions on surfaces of abrasive grains belonging to the parts of the abrasive grains that have larger particle diameters than the volume-based average particle diameter of the abrasive grains have an average height of 3.5 nm or more.