Patent ID: 7922926
Filing Date: 2011-04-12
Classification: C09G,C09K,C23F

Abstract:
1. A chemical-mechanical polishing composition consisting essentially of: (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, (d) about 10 to about 1000 ppm of a nonionic surfactant, (e) at least 0.8 wt. % to about 1.5 wt. % of an additive compound selected from the group consisting of glycine, alanine, iminodiacetic acid, and maleic acid, (f) hydrogen peroxide, (g) optionally a biocide, and (h) water.