Patent ID: 7550020

Claim:
A chemical mechanical polishing aqueous dispersion comprising abrasives in a concentration of not greater than 1.5% by mass, wherein the abrasives comprise composite particles obtained by mixing ceria and cationic organic particles and have an average dispersed particle diameter of not less than 1.0 μm, the amount of the cationic organic particles mixed being not more than 100 parts by mass relative to 100 parts by mass of the ceria, wherein the cationic organic particles are polymer particles to which a surfactant having a cationic residue is adhered, a polymer of the polymer particles has a neutral or anionic residue, and the cationic residue in the cationic organic particles is positioned in the side chain and/or at the terminal of the polymer, wherein when the polymer has the cationic residue in the side chain, the polymer is obtained by a homopolymerization of a cationic monomer, a copolymerization of two or more cationic monomers or a copolymerization of the cationic monomer and another monomer, when the polymer has the cationic residue at the terminal, the polymer is prepared by using a polymerization initiator having a residue that remains at the terminal of the polymer and becomes the cationic residue, and when the polymer has the cationic residues in the side chain and at the terminal of the polymer, the polymer is obtained by a homopolymerization of the cationic monomer, a copolymerization of the cationic monomer, or a copolymerization of the cationic monomer and another monomer, and wherein the cationic monomer is at least one selected from the group consisting of an aminoalkyl group-containing (meth)acrylic ester, an aminoalkoxyalkyl group-containing (meth)acrylic ester and a N-aminoalkyl group-containing (meth)acrylic amide.