US4731264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sol-gel compositions containing silane and alumina
Assignee: PPG Industries Ohio Inc
•
Filing: 1986-10-03
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Granted: 1988-03-15
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Expires: 2006-10-03
Abstract
Abstract An organoalkoxysilane/alumina sol-gel composition and method for its production are disclosed whereby an aluminum alkoxide is hydrolyzed in water to form a sol, to which is added a hydrolyzable organoalkoxysilane of the general formula R.sub.x Si(OR').sub.4-x wherein R is an organic radical, R' is a low molecular weight alkyl radical, and x is at least 1 and less than 4. The composition is dried and cured to form an organosiloxane/alumina monolith or coating on a substrate.
Inventors
- 👤 Chia-Cheng Lin
- 👤 Charlene A. Falleroni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/14; C09D183/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
49 words
A composition of matter comprising the polymerization reaction product of the hydrolyzate of an aluminum alkoxide and an organoalkoxysilane of the general formula R.sub.x Si(OR').sub.4-x wherein R is an organic radical, R' is a low molecular weight alkyl radical and x is at least one and less than 4.
Claim 2
Dependent Claim
49 words
A composition of matter comprising the polymerization reaction product of the hydrolyzate of an aluminum alkoxide and an organoalkoxysilane of the general formula R.sub.x Si(OR').sub.4-x wherein R is an organic radical, R' is a low molecular weight alkyl radical and x is at least one and less than 4.
Claim 3
Dependent Claim
24 words
A composition according to claim 1, wherein R is selected from the group consisting of alkyl, vinyl, methoxyethyl, phenyl, γ-glycidoxypropyl, γ-methacryloxypropyl and mixtures thereof.
Claim 4
Dependent Claim
27 words
A composition according to claim 1, wherein R' is an alkyl radical of the general formula C n H 2n+1 wherein n is from 2 to 4.
Claim 5
Dependent Claim
19 words
A composition according to claim 3, wherein R' is selected from the group consisting of methyl, ethyl and propyl.
Claim 6
Dependent Claim
17 words
A composition according to claim 4, wherein R is methyl, R' is ethyl, and x is 1.
Claim 7
Dependent Claim
25 words
A composition according to claim 1, wherein said aluminum alkoxide has the general formula Al(OR) 3 wherein R is a low molecular weight alkyl radical.
Claim 8
Dependent Claim
20 words
A composition according to claim 6, wherein the aluminum alkoxide is aluminum isopropoxide, Al(OC 3 H 7 ) 3 .
Claim 9
Dependent Claim
20 words
A composition according to claim 1, wherein said organoalkoxysilane comprises at least one organoalkoxysilane which comprises an epoxy-containing alkyl radical.
Claim 10
Dependent Claim
17 words
A composition according to claim 8, wherein said organoalkoxysilane comprises an epoxyalkoxysilane in combination with an alkylalkoxysilane.
Claim 11
Dependent Claim
22 words
A composition according to claim 9, wherein said organoalkoxysilane comprises γ-glycidoxypropyl trimethoxysilane and methyl triethoxysilane, and said aluminum alkoxide is aluminum isopropoxide.
Claim 12
Independent Claim
54 words
A method of making an organoalkoxysilane/alumina composition comprising the steps of: a. hydrolyzing an aluminum alkoxide; and b. adding to said hydrolyzate an organoalkoxysilane of the general formula R.sub.x Si(OR').sub.4-x wherein R is an organic radical, R' is a low molecular weight alkyl radical, and x is at least 1 and less than 4.
Claim 13
Independent Claim
54 words
A method of making an organoalkoxysilane/alumina composition comprising the steps of: a. hydrolyzing an aluminum alkoxide; and b. adding to said hydrolyzate an organoalkoxysilane of the general formula R.sub.x Si(OR').sub.4-x wherein R is an organic radical, R' is a low molecular weight alkyl radical, and x is at least 1 and less than 4.
Claim 14
Dependent Claim
24 words
A method according to claim 11, wherein the step of hydrolyzing said aluminum alkoxide is carried out in water to form a clear sol.
Claim 15
Dependent Claim
23 words
A method according to claim 12, wherein the step of hydrolyzing said aluminum alkoxide is carried out in the presence of an acid.
Claim 16
Dependent Claim
21 words
A method according to claim 13, wherein the step of hydrolyzing said aluminum alkoxide is carried out at above ambient pressure.
Claim 17
Dependent Claim
21 words
A method according to claim 12, wherein the step of adding said organoalkoxysilane is followed by essentially completely hydrolyzing said composition.
Claim 18
Dependent Claim
19 words
A method according to claim 11, further comprising the step of drying said composition to remove water and alcohol.
Claim 19
Dependent Claim
20 words
A method according to claim 16, further comprising the step of curing said composition to form an inorganic polymer network.
Claim 20
Dependent Claim
39 words
A method according to claim 17 further comprising the step of applying said composition to the surface of a substrate, wherein said drying and curing steps are carried out on said substrate thereby forming a coating on said substrate.
Claim 21
Dependent Claim
16 words
A method according to claim 18, wherein said curing step is carried out at elevated temperature.
Claim 22
Dependent Claim
22 words
A method according to claim 19, wherein said curing step is carried out at a temperature between 80° C. and 600° C.
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |