Patent ID: 9640407
Date: 2017-05-02
CPC Classifications: C09G,C09K,H01L

Claim:
1. A polishing composition used in polishing an object having a hydrophobic silicon-containing part and a hydrophilic silicon-containing part, the polishing composition comprising a water-soluble polymer having a hydrophilic group, and abrasive grains, wherein the polishing composition does not contain an oxidizing agent or a metal corrosion inhibitor, wherein the water-soluble polymer is polyglycerol, pentanol, polypropylene glycol, a polyoxyethylene alkylene diglyceryl ether, a polyoxyethylene alkyl ether, or polyoxyethylene sorbitan monooleate, wherein the abrasive grains are formed of colloidal silica on which an organic acid is immobilized, wherein the abrasive grains have an average primary particle diameter of 5 nm or more and 100 nm or less, wherein the abrasive grains have an average secondary particle diameter of 150 nm or less, wherein the polishing composition has a pH of 6 or less, and wherein the hydrophobic silicon-containing part after the object is polished with the polishing composition has a water contact angle lower than that of the hydrophobic silicon-containing part after the object is polished with another composition having the same makeup as the polishing composition except that the water-soluble polymer is not contained therein.