Polishing Material Composition And Production Method Therefor

Abstract

An abrasive composition to be used in an abrasive material, including an inorganic abrasive particle. The particle comprises a shell layer being an outermost layer and mainly composed of cerium oxide; and 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. The abrasive composition also includes an organic base member comprising a polymerizable compound, wherein an outer surface of the organic base member is covered with the inorganic abrasive particle.

1 . An abrasive composition to be used in an abrasive material, comprising:
 an inorganic abrasive particle comprising:   a shell layer being an outermost layer and mainly composed of cerium oxide; and   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   an organic base member comprising a polymerizable compound,   wherein an outer surface of the organic base member is covered with the inorganic abrasive particle.   
     
     
         2 . The abrasive composition according to  claim 1 , wherein
 the inorganic abrasive particle further comprises a core layer formed on an inner side of the intermediate layer and including a center of the inorganic abrasive particle, wherein   the core layer is 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.   
     
     
         3 . The abrasive composition according to  claim 1 , wherein
 the inorganic abrasive particle is polymerized to the outer surface of the organic base member.   
     
     
         4 . 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.   
     
     
         5 . The method of producing an abrasive composition according to  claim 4 , wherein
 producing inorganic abrasive particles comprises:   forming a core layer mainly composed of a salt 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 through formation of the salt;   forming an intermediate layer comprising a Ce salt and a salt of at least one element selected from the group consisting of AI, 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 on an outer surface of the core layer by adding an aqueous solution comprising 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 an aqueous solution comprising a Ce salt to a first dispersion comprising the dispersed particles of the salt of the element formed in the core layer-forming;   forming a shell layer mainly composed of a Ce salt on an outer surface of the intermediate layer by adding an aqueous solution comprising a Ce salt to a second dispersion comprising the dispersed particles provided with the intermediate layer of the salts in the intermediate layer-forming;   separating the solid being an abrasive material precursor from a third dispersion prepared in the shell layer-forming; and   firing the abrasive material precursor prepared in the separation in the air or in an oxidizing atmosphere.