Patent US4801399A successfully refreshed from Google Patents.
US4801399A
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Inorganic salts as peptizing agents in the preparation of metal oxide sol-gel compositions
Assignee: University of Florida
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Filing: 1986-02-25
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Granted: 1989-01-31
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Expires: 2006-02-25
Abstract
Abstract A novel method for preparing sols from metal oxide precursors by using inorganic salts as the peptizing agent is disclosed herein. Sol-gels prepared from the sols are also disclosed. Ceramic coatings, monoliths, bodies and are formed. These structures have a particle size of down to 0.0001 micron and are endowed with excellent packing characteristics as well as smoothness.
Inventors
- 👤 David E. Clark
- 👤 William J. Dalzell, Jr.
- 👤 Brenda L. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:28
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0047; C; C01; C01F; C01F17/00; C01F17/30; C01F17/32; C01F17/34; C01F7/00; C01F7/02; C01F7/16; C01F7/162; C01F7/30; C01G; C01G25/00; C01G37/00; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C04B35/622; C04B35/624; C04B35/71; C04B35/78; C04B35/80; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3218; C04B2235/44; C04B2235/441; C04B2235/443; C04B2235/60; C04B2235/606
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A method of preparing a metal oxide sol, said method comprising the steps of: hydrolyzing and peptizing a metal alkoxide in the presence of an excess of aqueous medium and in the presence of a metal nitrate used as a peptizing agent, said metal alkoxide, said medium and said nitrate being present in a proportion, and said hydrolysis and said peptizing being conducted at a temperature and for a time effective to obtain a sol whose colloids have a particle size of up to and including 10 microns.
Claim 2
Independent Claim
88 words
A method of preparing a metal oxide sol, said method comprising the steps of: hydrolyzing and peptizing a metal alkoxide in the presence of an excess of aqueous medium and in the presence of a metal nitrate used as a peptizing agent, said metal alkoxide, said medium and said nitrate being present in a proportion, and said hydrolysis and said peptizing being conducted at a temperature and for a time effective to obtain a sol whose colloids have a particle size of up to and including 10 microns.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said alkoxide is aluminum sec-butoxide.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the metal nitrate is aluminum nitrate.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the proportion of metal nitrate to metal alkoxide for the formation of the sol is between 0.001:1 and about 1:1.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the particle size in the sol is between about 0.0001 micron and about 1 micron.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the peptizing temperature is between about 80° C. and about 120° C.
Claim 8
Dependent Claim
36 words
A method for obtaining a metal oxide sol-gel, comprising: (a) the method of claim 1 to obtain a sol; and (b) partially reducing the volume of said aqueous medium of said sol to obtain a sol-gel.
Claim 9
Dependent Claim
29 words
The method of claim 7 wherein the sol-gel further contains a filler in the form of a powder, shavings, fibers, fines, ultrafines, whiskers, colloids or platelets and mixtures thereof.
Claim 10
Dependent Claim
26 words
The method of claim 8, wherein the filler comprises a material selected from the group consisting of carbon, metal powders, carbides and nitrides and mixtures thereof.
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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |