Patent ID: 9157011
Filing Date: 2015-10-13
Classification: C09G,C09K,H01L

Abstract:
1. A polishing composition comprising colloidal silica, wherein when “A” denotes an average aspect ratio (dimensionless) of the colloidal silica; “D” denotes an average particle diameter (units: nm) of the colloidal silica; “E” denotes a standard deviation of the particle diameter (units: nm) of the colloidal silica; and “F” denotes a volume fraction (units: %) of particles having a diameter of 1 to 300 nm in the colloidal silica, a value obtained by the expression A×D×E×F is 350.000 or greater, the volume fraction of particles having a diameter of 1 to 300 nm in the colloidal silica is 90% or greater, the volume fraction of particles having a diameter of 50 nm or greater and an aspect ratio of 1.2 or greater in the colloidal silica is 50% or greater, the standard deviation of the particle diameter of the colloidal silica is 34.2 nm or more.