Patent ID: 8030213

Claim:
A polishing composition comprising cerium oxide particles, a water-soluble polyether diamine represented by the following formula (2), at least one basic compound selected from the group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, tetramethylammonium hydroxide, monoethanolamine, ethylethanolamine, diethanolamine, propylenediamine, ammonia; and water, wherein the composition has a pH ranging from 10 to 13: H 2 N—R 2 —O—(R 1 —O—) m —R 2 —NH 2 (2) wherein R 1 is an ethylene group or a propylene group, R 2 is a C 2-6 alkylene group, m is an integer of at least 1, and n is an integer of at least 1, provided that R 1 and R 2 may be the same or different.