US4465739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substrates coated with aluminum oxide solutions
Assignee: Westinghouse Electric Corp
•
Filing: 1982-10-13
•
Granted: 1984-08-14
•
Expires: 2002-10-13
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 DEG to about 60 DEG 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 DEG C.
Inventors
- 👤 Bulent E. Yoldas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:11
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C03C1/00; C03C1/006; C03C1/008; C03C17/02; 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; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
A method of forming a polymerized Al 2 O 3 coating on a substrate comprising preparing a clear partially hydrolyzed aluminum alkoxide solution by (A) mixing Al(OR) 3 with about 0.4 to about 1 mole of water per mole of Al(OR) 3 in the presence of sufficient alcohol to give a maximum weight % of equivalent Al 2 O 3 of 10% where R is alkyl to C 6 ; (B) applying said solution to a surface of a substrate; and (C) heating said solution on said surface to at least about 400° C.
Claim 2
Independent Claim
94 words
A method of forming a polymerized Al 2 O 3 coating on a substrate comprising preparing a clear partially hydrolyzed aluminum alkoxide solution by (A) mixing Al(OR) 3 with about 0.4 to about 1 mole of water per mole of Al(OR) 3 in the presence of sufficient alcohol to give a maximum weight % of equivalent Al 2 O 3 of 10% where R is alkyl to C 6 ; (B) applying said solution to a surface of a substrate; and (C) heating said solution on said surface to at least about 400° C.
Claim 3
Dependent Claim
55 words
A method according to claim 1 including the additional last 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 O 3 of about 3%.
Claim 4
Dependent Claim
11 words
A method according to claim 1 wherein R is secondary butoxide.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said mixture is heated at about 40° to about 60° C.
Claim 6
Dependent Claim
28 words
A method according to claim 2 wherein in said additional last step the number of moles of water per mole of alkoxide is about 2 to about 3.
Claim 7
Dependent Claim
22 words
A method according to claim 1 wherein said water is mixed with said alcohol and that mixture is mixed with said alkoxide.
Claim 8
Dependent Claim
21 words
A method according to claim 1 wherein said alcohol and said alkoxide are mixed prior to the addition of said water.
Claim 9
Dependent Claim
28 words
A method according to claim 1 wherein said alcohol is ROH and the R group in said alcohol is the same as the R group in said alkoxide.
Claim 10
Dependent Claim
22 words
A method according to claim 1 wherein said alcohol is selected from the group consisting of ethanol, propanol, butanol, and mixtures thereof.
Claim 11
Dependent Claim
18 words
A polymerized Al 2 O 3 coating on a substrate formed according to the method of claim 1.
Claim 12
Dependent Claim
58 words
A solution according to claim 1 wherein said method includes the additional last 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 O 3 of about 3%.
Claim 13
Dependent Claim
11 words
A solution according to claim 1 wherein R is secondary butoxide.
Claim 14
Dependent Claim
18 words
A solution according to claim 1 wherein said mixture is heated to about 40° to about 60° C.
Claim 15
Dependent Claim
28 words
A solution according to claim 11 wherein in said additional last step the number of moles of water per mole of alkoxide is about 2 to about 3.
Claim 16
Dependent Claim
22 words
A solution according to claim 1 wherein said water is mixed with said alcohol and that mixture is mixed with said alkoxide.
Claim 17
Dependent Claim
21 words
A solution according to claim 1 wherein said alcohol and said alkoxide are mixed prior to the addition of said water.
Claim 18
Dependent Claim
28 words
A solution according to claim 1 wherein said alcohol is ROH and the R group in said alcohol is the same as the R group in said alkoxide.
Claim 19
Dependent Claim
22 words
A solution according to claim 1 wherein said alcohol is selected from the group consisting of ethanol, propanol, butanol, and mixtures thereof.
References Cited (Backward Citations)
US4361598A
Cited
US4272588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |