Patent ID: 9422454
Filing Date: 2016-08-23
CPC Classification: B24B,C09G,C09K,H01L

Claim Text:
1. A polishing composition used for polishing an object having a first layer and a second layer, wherein: the second layer is formed on the first layer; the first layer exhibits a positive zeta potential at a pH of 3.5 or less; and the second layer is formed of a different material from that of the first layer, the polishing composition comprising an anionic and water-soluble polymer and abrasive grains, wherein: the water-soluble polymer has an acid dissociation constant pKa of 3 or less; the abrasive grains are colloidal silica on which an organic acid is immobilized; and the abrasive grains exhibit a negative zeta potential at a pH of 3.5 or less.