Patent ID: 9650544
Date: 2017-05-16
CPC Classifications: C09G,C09K,H01L

Claim:
1. A method for producing a polishing composition, the method comprising: preparing an undiluted polishing composition containing silicon dioxide and a water-soluble polymer including carbon; and diluting the undiluted polishing composition with water or a basic aqueous solution to obtain a polishing composition in which at least part of the water-soluble polymer is adsorbed on the silicon dioxide, wherein the concentration of the water-soluble polymer adsorbed on the silicon dioxide is 4 ppm or more by mass in terms of carbon and a percentage of the concentration of the water-soluble polymer adsorbed on the silicon dioxide in terms of carbon relative to the total concentration of all the water-soluble polymer in the polishing composition is 15% or more in terms of carbon, wherein the preparing an undiluted polishing composition includes mixing silicon dioxide with a basic compound to obtain a first mixture, mixing a water-soluble polymer with the first mixture to obtain a second mixture, and then filtering the second mixture.