Patent ID: 9159352
Filing Date: 2015-10-13
Classification: B24B,C09K,G11B

Abstract:
1. A polishing liquid composition for a magnetic disk substrate, comprising inorganic particles, a diallylamine polymer, an acid and water, wherein the inorganic particles include alumina particles and silica particles, wherein the diallylamine polymer includes one or more constitutional units selected from the group consisting of constitutional units represented by the following general formulas (I-a), (I-b), (I-c) and (I-d), and the content of the diallylamine polymer in the polishing liquid composition is 0.020 to 0.080 wt %, where R wherein the diallylamine polymer further includes a constitutional unit represented by the following general formula (II) wherein a mole ratio of the constitutional units represented by the general formulas (I-a) to (I-d) to the constitutional unit represented by the general formula (II) (general formulas (I-a) to (I-d)/general formula (II)) is 60/40 to 40/60 in all of the constitutional units of the diallylamine polymer.