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US5316695A
Expired / Lapsed
US
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Use of polymeric catalyst in synthesis of sol-gel derived ceramic materials
Assignee: Virginia Tech Intellectual Properties Inc
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Filing: 1989-08-10
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Granted: 1994-05-31
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Expires: 2009-08-10
Abstract
Abstract Polymeric catalysts (e.g., polymeric acid catalysts such as poly(styrene)sulfonic acid) can be used in the synthesis of sol-gel derived ceramic materials from metal alkoxides, for example, organic/inorganic hybrid materials formed by reaction of a metal alkoxide and a reactive endcapped polymeric modifier. The use of a polymeric catalyst, rather than a conventional monomeric (inorganic or organic) acid catalyst, has a non-deleterious effect on the aging behavior and offers potential for control of rheological properties (spinnability, coatability, etc.) of the hybrid materials.
Inventors
- 👤 Garth L. Wilkes
- 👤 Anthony B. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:31
CPC Classifications
C; C03; C03C; C03C14/00; C04; C04B; C04B35/00; C04B35/622; C04B35/624; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08G77/48; C08G77/50; C08G77/58; C03C2214/00; C03C2214/12; C03C2214/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
30 words
In a method for the synthesis of sol-gel derived ceramic materials comprising the hydrolytic condensation of a metal alkoxide using a catalyst, the improvement which comprises using a polymeric catalyst.
Claim 2
Dependent Claim
30 words
In a method for the synthesis of sol-gel derived ceramic materials comprising the hydrolytic condensation of a metal alkoxide using a catalyst, the improvement which comprises using a polymeric catalyst.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1 wherein the material is a sol-gel derived organic/inorganic hybrid material derived from a metal alkoxide and an alkoxy silane-endcapped polymeric modifier.
Claim 4
Dependent Claim
16 words
A method as claimed in claim 2 wherein the polymeric catalyst is a polymeric acid catalyst.
Claim 5
Dependent Claim
13 words
A method as claimed in claim 3 wherein the catalyst is poly(styrenesulfonic acid).
Claim 6
Dependent Claim
32 words
The method as claimed in claim 3 wherein the catalyst is used to form a hybrid material containing up to about 90%, by weight, ceramic component with the remainder an organic component.
Claim 7
Dependent Claim
16 words
A method as claimed in claim 1 wherein the polymeric catalyst is a polymeric acid catalyst.
Claim 8
Dependent Claim
13 words
A method as claimed in claim 6 wherein the catalyst is poly(styrenesulfonic acid).
Claim 9
Dependent Claim
29 words
A composition adapted to form a ceramic material via sol-gel synthesis which comprises a metal alkoxide and a catalytically effective amount of a polymeric catalyst for the sol-gel synthesis.
Claim 10
Dependent Claim
29 words
A composition adapted to form a ceramic material via sol-gel synthesis which comprises a metal alkoxide and a catalytically effective amount of a polymeric catalyst for the sol-gel synthesis.
Claim 11
Dependent Claim
16 words
A composition as claimed in claim 8 which also comprises a an alkoxy silane-endcapped polymeric modifier.
Claim 12
Dependent Claim
33 words
A composition as claimed in claim 9 wherein the metal alkoxide comprises up to about 90%, by weight, of the composition and an alkoxy silane-endcapped polymeric modifier comprises the remained of the composition.
Claim 13
Dependent Claim
14 words
A composition as claimed in claim 10 wherein the catalyst is poly (styrenesulfonic acid).
Claim 14
Dependent Claim
14 words
A composition as claimed in claim 9 wherein the catalyst is polymeric acid catalyst.
Claim 15
Dependent Claim
14 words
A composition as claimed in claim 8 wherein the catalyst is polymeric acid catalyst.
Claim 16
Dependent Claim
14 words
A composition as claimed in claim 13 wherein the catalyst is poly (styrenesulfonic acid).
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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) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |