Dispersion of a rare earth phosphate, and a process for its...

Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...

Reexamination Certificate

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C524S403000, C106S014120, C106S286100, C252S30140P

Reexamination Certificate

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07572835

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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PTO 06-1727, English Language translation of WO 00/76918 A1 (Jan. 2006), USPTO, Wash., DC, pp. Title page & 1-18.
Boakye et al: “Porous Aluminum Oxide and Lanthanum Phosphate Fiber Coatings”, Proceedings of the 1996 20th Annual Conf. on Composites Advanced Ceramics, Materials and Structures BI Cocoa Beach, FL., Jan. 1, 1996, vol. 17, No. 4, 1996, pp. 53-60; XP 00212977 Ceram. Eng. Sci Proc; Ceram. Eng. & Sci. Proceedings 1996 American Ceramic SRC.
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.
International Search Report, PCT/FR01/03875, (Mar. 2002), pp. 1-4.

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