Patent US5328645A successfully refreshed from Google Patents.
US5328645A
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US
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Gel promoters for silica sols
Assignee: PPG Industries Inc
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Filing: 1989-01-04
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Granted: 1994-07-12
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Expires: 2009-01-04
Abstract
Abstract An alkoxysilane sol-gel composition and method for its production are disclosed whereby an alkoxysilane of the general formula Si(OR).sub.4 wherein R is an organic radical such as methyl, ethyl, propyl or butyl is hydrolyzed with an acid catalyst and the resulting acidic sol is further hydrolyzed and condensed in the presence of an alkaline component which accelerates gelation to form an inorganic oxide network.
Inventors
- 👤 Chia-Cheng Lin
- 👤 John D. Basil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:08
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A method of making an alkoxysilane composition comprising the steps of: a. dissolving in an organic solvent an alkoxysilane of the general formula Si(OR) 4 wherein R is a low molecular weight alkyl group; b. partially hydrolyzing said alkoxysilane in the presence of an acid catalyst to form an acidic sol; and c. adding to said acidic sol an alkaline component selected from the group consisting of amino-functional silane, buffered organic amine, base-catalyzed silica sol, alkaline colloidal silica sol, and anion exchange resin in hydroxide form which accelerates gelation of said acidic sol to form a gel.
Claim 2
Independent Claim
97 words
A method of making an alkoxysilane composition comprising the steps of: a. dissolving in an organic solvent an alkoxysilane of the general formula Si(OR) 4 wherein R is a low molecular weight alkyl group; b. partially hydrolyzing said alkoxysilane in the presence of an acid catalyst to form an acidic sol; and c. adding to said acidic sol an alkaline component selected from the group consisting of amino-functional silane, buffered organic amine, base-catalyzed silica sol, alkaline colloidal silica sol, and anion exchange resin in hydroxide form which accelerates gelation of said acidic sol to form a gel.
Claim 3
Dependent Claim
13 words
A method according to claim 1, wherein the amino-functional silane is an aminoalkyltrialkoxysilane.
Claim 4
Dependent Claim
12 words
A method according to claim 2, wherein the amino-functional silane is γ-aminopropyltrimethoxysilane.
Claim 5
Dependent Claim
12 words
A method according to claim 2, wherein the amino-functional silane is γ-aminopropyltriethoxysilane.
Claim 6
Dependent Claim
15 words
A method according to claim 1, wherein said alkaline component comprises a buffered organic amine.
Claim 7
Dependent Claim
15 words
A method according to claim 1, wherein said alkaline component comprises a base-catalyzed silica sol.
Claim 8
Dependent Claim
16 words
A method according to claim 1, where said alkaline component comprises an alkaline colloidal silica sol.
Claim 9
Dependent Claim
18 words
A method according to claim 1, wherein said alkaline component comprises an anion exchange resin in hydroxide form.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |