US4830993A
Expired / Lapsed
US
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Process for the manufacture of a metal oxide powder for ceramic materials and zirconia powder produced by this process
Assignee: Solvay SA
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Filing: 1987-01-06
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Granted: 1989-05-16
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Expires: 2007-01-06
Abstract
Abstract Process for the manufacture of a metal oxide powder for ceramic materials by the hydrolysis of a metal alcoholate in the presence of an acidic organic compound. The process applies to the production of metal oxide powders, such as zirconia powders, with a mean particle diameter of between 0.05 and 2 microns.
Inventors
- 👤 Franz Legrand
- 👤 Patricia Van den Bossche-De Bruycker
- 👤 Luc Lerot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:50
CPC Classifications
C; C01; C01G; C01G25/00; B; B82; B82Y; B82Y30/00; C01B; C01B13/00; C01B13/14; C01B13/32; C01G25/02; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
39 words
A process for the manufacture of a metal oxide powder for ceramic materials, comprising: hydrolyzing a metal alcoholate in an organic solution in the presence of an acidic organic compound containing more than six carbon atoms in its molecule.
Claim 2
Dependent Claim
39 words
A process for the manufacture of a metal oxide powder for ceramic materials, comprising: hydrolyzing a metal alcoholate in an organic solution in the presence of an acidic organic compound containing more than six carbon atoms in its molecule.
Claim 3
Dependent Claim
26 words
The process according to claim 1, in that the acidic organic compound is chosen from carboxylic acids containing more than six carbon atoms in their molecule.
Claim 4
Dependent Claim
30 words
The process according to claim 1, wherein the acidic organic compound is used in a molar quantity of between 0.005 and 3 times the molar quantity of the metal alcoholate.
Claim 5
Dependent Claim
23 words
The process according to claim 1, wherein the acidic organic compound is added to the metal alcoholate or to water, before the hydrolysis.
Claim 6
Dependent Claim
21 words
The process accoring to claim 1, wherein the metal alcoholate and the water are used in the form of organic solutions.
Claim 7
Dependent Claim
41 words
The process according to claim 5, wherein an alcoholic solution of the alcoholate, containing between 0.05 and 1 mole of alcoholate per liter and an alcoholic solution of water containing between 0.1 and 3 moles of water per liter are used.
Claim 8
Dependent Claim
38 words
The process according to claim 1, wherein, to perform the hydrolysis, the metal alcoholate, the water and the acidic organic compound are mixed so as to produce a homogeneous mixture before the nucleation of the metal oxide begins.
Claim 9
Dependent Claim
30 words
The process according to claim 1, wherein the metal alcoholate is chosen from the alcoholates of metals of groups II, III and IV of the Periodic Table of the elements.
Claim 10
Dependent Claim
13 words
The process according to claim 8, wherein the metal alcoholate contains zirconium alcoholate.
Claim 11
Dependent Claim
23 words
Metal oxide powder produced by a process according to claim 1, consisting of spherical particles whose diameter is between 0.05 and 2 microns.
Claim 12
Dependent Claim
11 words
Powder according to claim 10, wherein the metal oxide comprises zirconia.
Claim 13
Dependent Claim
79 words
A process for the manufacture of a metal oxide powder for ceramic materials, comprising: dissolving an alcoholate of the metal in an organic solvent to prepare an organic solution of the metal alcoholate, treating the organic solution of the metal alcoholate with water in the presence of an acidic organic compound containing more than six carbon atoms in its molecule to hydrolyse th metal alcoholate and precipitate a metal oxide as a powder, and collecting said metal oxide powder.
Claim 14
Dependent Claim
79 words
A process for the manufacture of a metal oxide powder for ceramic materials, comprising: dissolving an alcoholate of the metal in an organic solvent to prepare an organic solution of the metal alcoholate, treating the organic solution of the metal alcoholate with water in the presence of an acidic organic compound containing more than six carbon atoms in its molecule to hydrolyse th metal alcoholate and precipitate a metal oxide as a powder, and collecting said metal oxide powder.
Claim 15
Dependent Claim
47 words
A process according to claim 1, comprising treating the organic solution of the metal alcoholate with the acidic organic compound containing more than six carbon atoms in its molecule to precipitate the metal oxide as a powder of particles of between 0.05 and 5 microns in size.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |