Patent EP0072995A1 successfully refreshed from Google Patents.
EP0072995A1
Expired / Lapsed
EP
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Clear aluminum oxide solutions and glasses
Assignee: Westinghouse Electric Corp
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Filing: 1982-08-16
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Granted: —
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Expires: 2002-08-16
Abstract
Abstract Disclosed is a method of preparing a clear partially hydrolyzed aluminum alkoxide solution by mixing an aluminum alkoxide with about 0.4 to about 1 moles of water per mole of aluminum alkoxide in the presence of sufficient alcohol to give a maximum weight percent of equivalent alumina of 10%. The mixture is then heated until clear, which typically requires a temperature of about 40 to about 60°C. Then sufficient additional water is added to bring the number of moles of water per mole of alkoxide up to at least about 2. The water is added in the presence of sufficient alcohol to give a maximum weight percent of equivalent alumina of about 3%. A polymerized alumina glass can be prepared from the composition by heating it to a temperature of at least 500°C.
Inventors
- 👤 Bulent Erturk Yoldas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 07:07
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/28; C07C31/32; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C03; C03C; C03C1/00; C03C1/006; C03C1/008; C03C17/00; C03C17/02; C03C17/22; C03C17/23; C03C17/25; C03C3/00; C03C3/12; C03C3/125; C01P; C01P2006/00; C01P2006/60; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/214; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
62 words
A method of preparing a clear, partially hydrolyzed aluminum alkoxide solution characterized by mixing A1(OR) 3 with 0.4 to 1 mole of water per mole of AL(OR) 3 in the presence of sufficient alcohol to give a maximum weight % of equivalent A1 2 0 3 of 10%, where R is alkyl to C 6 ; and heating said mixture until clear.
Claim 2
Independent Claim
62 words
A method of preparing a clear, partially hydrolyzed aluminum alkoxide solution characterized by mixing A1(OR) 3 with 0.4 to 1 mole of water per mole of AL(OR) 3 in the presence of sufficient alcohol to give a maximum weight % of equivalent A1 2 0 3 of 10%, where R is alkyl to C 6 ; and heating said mixture until clear.
Claim 3
Dependent Claim
55 words
A method according to Claim 1 including the additional subsequent step of adding sufficient additional water to bring the number of moles of water per mole of alkoxide up to at least about 2, in the presence of sufficient alcohol to give a maximum weight % of equivalent Al 2 0 3 of about 3%.
Claim 4
Dependent Claim
13 words
A method according to Claim 1 or 2 wherein R is secondary butoxide.
Claim 5
Dependent Claim
20 words
A method according to Claim 1, 2 or 3 wherein said mixture is heated at about 40 to about 60°C.
Claim 6
Dependent Claim
33 words
A method according to Claim 2 or Claims 3 to 4 when appended to Claim 2 wherein the number of moles of water per mole of alkoxide is about 2 to about 3.
Claim 7
Independent Claim
25 words
A method according to any of the preceding claims wherein said water is mixed with said alcohol and that mixture is mixed with said alkoxide.
Claim 8
Independent Claim
24 words
A method according to any of the preceding claims wherein said alcohol and said alkoxide are mixed prior to the addition of said water.
Claim 9
Independent Claim
31 words
A method according to any of the preceding claims wherein said alcohol is ROH and the R group in said alcohol is the same as the R group in said alkoxide.
Claim 10
Independent Claim
27 words
A method according to any one of Claims 1 to 7 wherein said alcohol is selected from the group consisting of ethanol, propanol, butanol, and mixtures thereof.
Claim 11
Independent Claim
22 words
A method according to any of the preceding claims wherein the mixture is heated to a temperature of at least about 400°C.
Claim 12
Independent Claim
20 words
A method according to any of the preceding claims wherein a substrate is coated with said mixture and heat treated.
Claim 13
Dependent Claim
13 words
A composition prepared according to the method of any of the preceding claims.
Claim 14
Dependent Claim
13 words
Polymerized A1 2 0 3 formed according to the method of Claim 10.
References Cited (Backward Citations)
US3056725A
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US3394990A
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FR1524490A
Cited
US3941719A
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US4176171A
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US4278632A
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