Patent ID: 7754168
Filing Date: 2010-07-13
Classification: B82Y,C01F,C01P,C03C,C09K

Abstract:
1. A method of preparing a concentrate of fine ceria particles that is ready for use for chemical mechanical polishing of a substrate, the method comprising the steps: a) reacting a reactant mixture comprising: i) water, ii) an aqueous solution of water-soluble cerium salt compound, and iii) ammonia or an ammonium salt at a reaction temperature of 250-700° C. under a reaction pressure of 180-550 bar for 0.01 sec to 10 min in a continuous reactor to produce a solution containing the fine ceria particles, the cerium salt compound being present in an amount of 0.01 to 20 wt % in the reactant mixture; and b) concentrating the solution containing the fine ceria particles in a concentrator having a filter with a pore size of 0.01 to 10 μm,