Patent ID: 7998229

Claim:
A polishing composition comprising: polyoxyethylene sorbitan mono-fatty acid ester, wherein the polyoxyethylene sorbitan mono-fatty acid ester is contained in the polishing composition in an amount no less than 0.0005% by mass and no more than 0.0015% by mass; silicon dioxide having an average primary particle diameter of 10 nm to 120 nm and an average secondary particle diameter of 20 nm to 500 nm, wherein the silicon dioxide is contained in the polishing composition in an amount no less than 0.05% by mass and no more than 2.5% by mass; water soluble cellulose, the water soluble cellulose being hydroxyethyl cellulose, hydroxypropyl cellulose, or carboxymethyl cellulose, wherein the water soluble cellulose is contained in the polishing composition in an amount no less than 0.0025% by mass and no more than 0.1% by mass; an alkaline compound, the alkaline compound being NH 4 OH, wherein the alkaline compound is contained in the polishing composition in an amount of 0.005% by mass to 0.25% by mass; and remainder water.