Patent ID: 8808573
Filing Date: 2014-08-19
Classification: C09G,C09K,H01L

Abstract:
1. An acidic aqueous polishing composition suitable for polishing a silicon nitride-containing substrate in a chemical-mechanical polishing (CMP) process, the composition comprising: (a) about 0.01 to about 10 percent by weight of a particulate calcined ceria abrasive; (b) about 10 to about 100,000 ppm of at least one cationic polymer selected from the group consisting of (a) a poly(vinylpyridine) polymer and (b) a combination of a poly(vinylpyridine) polymer and a quaternary ammonium-substituted polymer; (c) about 10 to about 200,000 ppm of a polyoxyalkylene polymer; and (d) an aqueous carrier therefor, wherein the composition has a pH in the range of about 3 to about 6.