| US 7,584,910 B2 | ||
| Method of preparing an aggregate metal oxide particle dispersion having a desired aggregate particle diameter | ||
| Joanne Liu, Reading, Mass. (US); and Yakov E. Kutsovsky, Arlington, Mass. (US) | ||
| Assigned to Cabot Corporation, Boston, Mass. (US) | ||
| Filed on May 04, 2005, as Appl. No. 11/121,591. | ||
| Claims priority of provisional application 60/568572, filed on May 04, 2004. | ||
| Prior Publication US 2006/0088783 A1, Apr. 27, 2006 | ||
| Int. Cl. B02C 19/00 (2006.01) | ||
| U.S. Cl. 241—21 [241/29] | 73 Claims |
| 1. A method of preparing a dispersion of aggregate metal oxide particles having a pre-selected average aggregate particle
diameter comprising
(a) providing aggregate metal oxide particles comprised of fused primary particles having an average aggregate particle diameter
and an average primary particle diameter,
(b) pre-selecting a desired percent-reduction in the average aggregate particle diameter of the metal oxide particles to provide
a pre-selected average aggregate particle diameter,
(c) providing a dispersion standard pertaining to a dispersion of the aggregate metal oxide particles, wherein the dispersion
standard correlates (i) the solids concentration of the dispersion with (ii) the percent-reduction in the aggregate particle
diameter of the aggregate metal oxide particles that occurs when the dispersion is milled in a high-shear mixer,
(d) determining a solids concentration that correlates to the pre-selected percent-reduction in the average aggregate particle
diameter of the metal oxide particles by reference to the dispersion standard,
(e) combining the aggregate metal oxide particles of step (a) with water to provide a dispersion having a solids concentration
that is within 10% of the solids concentration determined in step (d), and
(f) milling the dispersion in a high-shear milling device to provide a dispersion of aggregate metal oxide particles having
about the pre-selected average aggregate particle diameter.
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