Patent ID: 9222009
Filing Date: 2015-12-29
Classification: C09K

Abstract:
1. Fine abrasive particles comprising cerium oxide, at least one type of element selected from the group consisting of La, Pr, Nd, Sm and Eu, and at least one type of element selected from the group consisting of Y, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, wherein: a content of Ce of the cerium oxide in the fine abrasive particles is 20 mol % or more; a sum of a content (mol %) of the at least one type of element selected from the group consisting of La, Pr, Nd, Sm and Eu in the fine abrasive particles and the content of Ce of the cerium oxide is larger than a sum of a content (mol %) of the at least one type of element selected from the group consisting of Y, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in the fine abrasive particles; the sum of the content (mol %) of the at least one type of element selected from the group consisting of Y, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu is 1 mol % or more; the sum of the content (mol %) of the at least one type of element selected from the group consisting of La, Pr, Nd, Sm and Eu is 5 mol % or more; an average size of the fine abrasive particles ranges from 0.02 to 2.0 μm; and the fine abrasive particles are spherical.