Patent number: 9850413
Abstract: In order to use less cerium oxide and achieve higher durability and polishing speeds, these abrasive particles used in an abrasive have: a shell layer (3) which is the outermost shell layer of the abrasive particles and is formed with cerium oxide as the main component; and a middle layer (2) which contains cerium oxide and an oxide of at least one element selected from Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, In, Sn, Y, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, W, Bi, Th, and the alkali earth metals, and which is formed closer to the center of the abrasive particles than the shell layer (3).
Type:
Grant
Filed:
June 10, 2013
Date of Patent:
December 26, 2017
Assignee:
KONICA MINOLTA, INC.
Inventors:
Atsushi Takahashi, Natsuki Ito, Akihiro Maezawa