Patent ID: 7367870

Claim:
A polishing slurry comprising (i) an oxidant, (ii) a metal oxide dissolver, (iii) a metal inhibitor and water and having a pH from 2 to 5, wherein; the metal oxide dissolver (ii) contains one or more compounds selected from one or more acids (A-group) selected from acids of which the negative value of the logarithm of the dissociation constant ka (pKa) of a first dissociable acid group is less than 3.7 and from which lactic acid, phthalic acid, fumaric acid, maleic acid and aminoacetic acid are excluded, ammonium salts of the A-group acids and esters of the A-group acids, and one or more compounds selected from one or more acids (B-group) selected from acids of which the negative value of the logarithm of the dissociation constant ka (pKa) of a first dissociable acid group is 3.7 or more, lactic acid, phthalic acid, fumaric acid, maleic acid and aminoacetic acid, ammonium salts of the B-group acids and esters of the B-group acids.