Patent ID: 7955517
Filing Date: 2011-06-07
Classification: B24B,C09G

Abstract:
1. A polishing process for a substrate to be polished, comprising polishing a substrate to be polished by applying a polishing composition to the substrate, wherein the substrate is a Ni-P plated aluminum substrate, and said composition comprises water, α-alumina, an intermediate alumina, and a polycarboxylic acid or salt thereof, said polycarboxylic acid being selected from the group consisting of maleic acid, fumaric acid, glutaric acid, citraconic acid, itaconic acid, tricarballylic acid, adipic acid, and diglycolic acid, wherein the intermediate alumina is present in an amount of from 4 to 75 parts by weight, based on 100 parts by weight of α-alumina in said composition, wherein said intermediate alumina is selected from the group consisting of γ-alumina, δ-alumina, θ-alumina, η-alumina, κ-alumina, and mixtures thereof.