US4476156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature process for obtaining thin glass films
Assignee: United States Department of Energy
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Filing: 1983-03-10
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Granted: 1984-10-09
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Expires: 2003-03-10
Abstract
Abstract A method for coating a substrate with a glass-like film comprises, applying to the substrate an aqueous alcoholic solution containing a polymeric network of partially hydrolyzed metal alkoxide into which network there is incorporated finely powdered glass, whereby there is achieved on the substrate a coherent and adherent initial film; and heating said film to a temperature sufficient to melt said powdered glass component, thereby converting said initial film to a final densified film.
Inventors
- 👤 C. Jeffrey Brinker
- 👤 Scott T. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:05
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C17/00; C03C17/02; C04B41/45; C04B41/50; C04B41/5022; C04B41/80; C04B41/81; C04B41/85; C04B41/86; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; C23C18/1229; C23C18/1241; C23C18/1245; C23C18/125; C23C18/1254; C23D; C23D5/00; C23D5/02; C23C18/1291
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
74 words
A method for coating a substrate with a glass-like film comprising, applying to the substrate, an aqueous alcoholic solution containing a polymeric network of partially hydrolyzed metal alkoxide into which network there is incorporated finely powdered glass, whereby there is achieved on the substrate a coherent and adherent initial film; and heating said film to a temperature sufficient to melt said powdered glass component, thereby converting said initial film to a final densified film.
Claim 2
Independent Claim
74 words
A method for coating a substrate with a glass-like film comprising, applying to the substrate, an aqueous alcoholic solution containing a polymeric network of partially hydrolyzed metal alkoxide into which network there is incorporated finely powdered glass, whereby there is achieved on the substrate a coherent and adherent initial film; and heating said film to a temperature sufficient to melt said powdered glass component, thereby converting said initial film to a final densified film.
Claim 3
Dependent Claim
26 words
A method of claim 1 further comprising preparing said solution by reacting said finely powdered glass with an aqueous alcoholic solution of partially hydrolyzed metal alkoxide.
Claim 4
Dependent Claim
67 words
A method of claim 2 wherein said aqueous alcoholic solution of partially hydrolyzed metal alkoxide further comprises an acid, a base or a system compatible alkali metal or alkaline earth metal salt and is prepared by holding said solution at a temperature of from room temperature to 80° C. for a time sufficient to hydrolyze said alkoxide and form a polymeric network of hydrolyzed and condensed alkoxide.
Claim 5
Dependent Claim
101 words
A method of claim 3 wherein said aqueous alcoholic solution containing a polymeric network of partially hydrolyzed metal akoxide into which network there is incorporated finely powdered glass, comprises the following relative proportions of ingredients: 50-500 g total of metal alkoxide and alkali or alkaline earth metal salt, wherein up to 50% of this amount is provided by the latter salt; 1,000-10,000 g of alcohol; 10-500 g of water; 10-100 g of said glass; if an acid is included, sufficient acid to provide a pH of 1-2.5; and if a base is included, sufficient base to provide a pH of 6-9.
Claim 6
Dependent Claim
38 words
A method of claim 4 wherein said metal alkoxide is a C 1-4 -alkoxide of B, Al, Ti, Si or Zr; said alcohol is a C 1-4 -alkanol; and said powdered glass is a silicate or phosphate-based glass.
Claim 7
Dependent Claim
17 words
A method of claim 4 wherein said powdered glass has a particle size of about 200-400 mesh.
Claim 8
Dependent Claim
31 words
A method of claim 4 wherein said aqueous alcoholic solution of partially hydrolyzed metal alkoxide has a pH of 1-2.5 which is provided by addition of HCl or HNO 3 .
Claim 9
Dependent Claim
20 words
A method of claim 1 wherein said solution is applied to the substrate by a dipping, spraying or spinning technique.
Claim 10
Dependent Claim
15 words
A method of claim 1 wherein said final film has a thickness of 0.1-100 μm.
Claim 11
Dependent Claim
15 words
A method of claim 4 wherein said final film has a thickness of 0.1-100 μm.
Claim 12
Dependent Claim
16 words
A method of claim 10 wherein said powdered glass has a softening point of 400°-1,000° C.
Claim 13
Dependent Claim
46 words
A method of claim 4 wherein said powdered glass is a powdered dehydrated glass-like gel prepared by drying an aqueous alcoholic solution containing a polymeric network of partially hydrolyzed metal alkoxide, thereby preparing a dehydrated glass-like gel and then grinding the latter to form a powder.
Claim 14
Dependent Claim
18 words
A method of claim 4 wherein the substrate is a glass, a metal, a semiconductor or a ceramic.
Claim 15
Dependent Claim
15 words
A method of claim 13 wherein the substrate is Cu, Ni, Al or a semiconductor.
Claim 16
Dependent Claim
28 words
A method of claim 1 wherein the initial film is heated at a temperature of from the softening point of the powdered glass up to 50° C. thereabove.
Claim 17
Dependent Claim
28 words
A method of claim 11 wherein the initial film is heated at a temperature of from the softening point of the powdered glass up to 100° C. thereabove.
Claim 18
Dependent Claim
10 words
A coated substrate prepared by the process of claim 1.
Claim 19
Dependent Claim
10 words
A coated substrate prepared by the process of claim 10.
Claim 20
Dependent Claim
10 words
A coated substrate prepared by the process of claim 11.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |