Patent ID: 7524347
Filing Date: 2009-04-28
Classification: C09G,C09K,G11B,H01L

Abstract:
1. A polishing composition comprising: (a) about 0.2 to about 1 wt. % of fumed alumina, (b) about 0.1 to about 1 wt. % of alpha alumina, (c) about 0.1 to about 4 wt. % of silica, wherein the silica is colloidal silica, (d) about 10 to about 1000 ppm of a nonionic surfactant, (e) a metal chelating organic acid, (f) an oxidizing agent selected from the group consisting of hydrogen peroxide, urea hydrogen peroxide, peroxysulfuric acid, peroxyacetic acid, perboric acid, salts thereof, and combinations thereof, and (g) a liquid carrier.