Patent ID: 6818031
Filing Date: 2004-11-16
Classification: C09G,C09K

Abstract:
A polishing composition comprising:i) an abrasive comprising two or more types of silica particles, wherein said silica particles have a particle size distribution as admixed silica particles of two or more types of silica particles such that a ratio of D90/D50 is from 1.3 to 3.0, and D50 is from 10 to 600 nm, wherein D90 is defined as a particle size at 90% counted from a smaller size side on a number base in a cumulative particle size distribution, and wherein D50 is defined as a particle size at 50% counted from a smaller size side on a number base in a cumulative particle size distribution, ii) an oxidizing agent; iii) a polishing accelerator comprising an organic phosphonic acid; and iv) water.