Polishing Material Composition And Production Method Therefor

A method of producing an abrasive composition, comprising:

• producing inorganic abrasive particles each comprising:
• a shell layer being an outermost layer and mainly composed of cerium oxide;
• an intermediate layer comprising cerium oxide and an oxide of at least one element selected from the group consisting of 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 alkali earth metals and formed on an inner side of the shell layer;
• and
• a core layer mainly composed of an oxide of at least one element selected from the group consisting of 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 alkali earth metals and formed on an inner side of the intermediate layer;
• mixing the inorganic abrasive particles produced in the production and an organic base member comprising a polymerizable compound to disperse the mixture in a dispersion liquid;
• and
• adding a polymerization initiator to the dispersion comprising the dispersed inorganic abrasive particles and the organic base member prepared in the dispersing to cover an outer surface of the organic base member with the inorganic abrasive particles by polymerization.