Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
2007-01-30
2007-01-30
Metzmaier, Daniel S. (Department: 1712)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C977S773000
Reexamination Certificate
active
10433739
ABSTRACT:
The invention concerns a colloidal dispersion of a phosphate of a rare earth and a process for its preparation. The dispersion is characterized in that it comprises anisotropic and disaggregated or disaggregatable particles of a phosphate of at least one rare earth and an anion of a monobasic acid, soluble in water and with a pKa of at least 2.5. It is prepared by a process in which a solution of a salt of at least one rare earth is mixed with phosphate ions while controlling the pH of the reaction medium to a value in the range 4 to 9 and in the presence of a monobasic acid, soluble in water and with a pKa of at least 2.5; the mixture obtained optionally undergoes a maturing step; the precipitate is then separated from the reaction medium; and said precipitate is then dispersed in water.
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patent: 5746944 (1998-05-01), Braconnier
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PTO 06-1727, English language translation of WO 00/76918 A1 (Jan. 2006), pages cover sheet & 1-18.
Peng Chen et al: “Synthesis and characterization of Tanthanum phosphate sol for fibre coating” Journal of Materials Science, Chapman and Hall Ltd., London, GB, vol. 32, No. 14, Jul. 15, 1997, pp. 3863-3867, XP002129771, ISSN: 0022-2461 the whole document.
Metzmaier Daniel S.
Rhodia Electronics and Catalysis
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