Process for preparation of alumina powder and precursor thereof

Details Process for preparation of alumina powder and precursor thereof Process for preparation of alumina powder and precursor thereof

2009-08-25

2011-11-01

Johnson, Edward (Department: 1736)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S625000

Reexamination Certificate

active

08048400

ABSTRACT:
There is provided a process for the preparation of a alumina precursor powder from aluminum hydroxide powder obtained by hydrolysis of aluminum alkoxide which precursor enables to provide alumina powder with a high volumetric efficiency.Such process comprises mixing aluminum hydroxide powder obtained by hydrolysis of an aluminum alkoxide with the following aqueous medium so as to obtain an aluminum hydroxide mixed slurry and then drying the aluminum hydroxide mixed slurry:aqueous medium: water or a medium mixture of water and a water-soluble alcohol wherein a water content in said medium mixture is not less than 15 parts by weight to 100 parts by weight of the medium mixture.

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“Technical Problems and Countermeasures therefor of Sol-Gel Process”; pp. 76-80 (1990) with its English Translation.
T. Kawaguchi; “Shrinkage Behavior of Silica Gels During Drying”; Journal of Non-Crystalline Solids 100; pp. 220-225; (1988).
Search Report and Written Opinion issued May 27, 2011 from the French Patent Office in French Patent Application No. 0955769 (with English translation of Written Opinion).

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