Patent ID: 8480920

Claim:
A chemical mechanical polishing aqueous dispersion that is used to polish a polishing target that includes a wiring layer that contains tungsten, the chemical mechanical polishing aqueous dispersion comprising: (A) a cationic water-soluble polymer; (B) an iron (III) compound; and (C) colloidal silica having an average particle diameter calculated from a specific surface area determined by the BET method of 10 to 60 nm, wherein the cationic water-soluble polymer (A) is present in a content (M A ) (mass %) of 0.001 to 0.01 mass %, and the colloidal silica (C) is present in a content (M c ) (mass %) of 1 to 30 mass %, the content (M A ) (mass %) of the cationic water-soluble polymer (A) and the content (Mc) (mass %) of the colloidal silica (C) satisfying the relationship “M A /M c =0.0001 to 0.003”, and the chemical mechanical polishing aqueous dispersion having a pH of 1 to 2.