US4746693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyalkylsilsesquioxane coating composition
Assignee: Lockheed Martin Corp
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Filing: 1986-12-12
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Granted: 1988-05-24
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Expires: 2006-12-12
Abstract
Abstract A composition suitable for forming polyalkylsilsesquioxane coatings is prepared by emulsion hydrolysis of one or more silanes in the presence of a nonvolatile, nonionic catalyst, a nonionic fluorochemical surfactant and sufficient water to only partially hydrolyze the silanes. The resulting stable composition will form the final resin upon exposure to atmospheric moisture. A novel resin, polymethyl/isobutylsilsesquioxane, is particularly suitable for such coatings.
Inventors
- 👤 Martin G. Meder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:44
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D4/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A process of forming a coating composition comprising: (a) combining: one or more silanes represented by the formula R--Si(OR) 3 wherein the groups represented by R are the same or different and are lower alkyl containing 1 to 6 carbon atoms, halolower alkyl containing 1 to 6 carbon atoms, phenyl or substituted phenyl, with the proviso that at least one group represented by R is lower alkyl; an effective amount of a nonvolatile, nonionic catalyst; a nonionic fluorochemical surfactant; and an amount of water representing from about 10 to about 95 mole percent of the moles of silanes present; (b) agitating the mixture to form an emulsion; and (c) maintaining said emulsion for a time sufficient to partially hydrolyze and condense said silanes to the extent permitted by the amount of water present.
Claim 2
Dependent Claim
133 words
A process of forming a coating composition comprising: (a) combining: one or more silanes represented by the formula R--Si(OR) 3 wherein the groups represented by R are the same or different and are lower alkyl containing 1 to 6 carbon atoms, halolower alkyl containing 1 to 6 carbon atoms, phenyl or substituted phenyl, with the proviso that at least one group represented by R is lower alkyl; an effective amount of a nonvolatile, nonionic catalyst; a nonionic fluorochemical surfactant; and an amount of water representing from about 10 to about 95 mole percent of the moles of silanes present; (b) agitating the mixture to form an emulsion; and (c) maintaining said emulsion for a time sufficient to partially hydrolyze and condense said silanes to the extent permitted by the amount of water present.
Claim 3
Dependent Claim
28 words
A process in accordance with claim 1, wherein the amount of water present represents from about 50 to about 90 mole percent of the moles of silanes present.
Claim 4
Dependent Claim
13 words
A process in accordance with claim 1, wherein the catalyst is dibutyltin dilaurate.
Claim 5
Dependent Claim
17 words
A process in accordance with claim 1, wherein the groups represented by R are methyl and isobutyl.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 4, wherein at least 50 percent of said groups are isobutyl.
Claim 7
Dependent Claim
14 words
A process in accordance with claim 1, wherein R represents methyl and phenyl groups.
Claim 8
Dependent Claim
14 words
A process in accordance with claim 1, wherein R represents methyl and 3,3,3-trifluoropropyl groups.
Claim 9
Dependent Claim
19 words
A process in accordance with claim 1, additionally including the step of adding a pigment to said coating composition.
Claim 10
Dependent Claim
10 words
A coating composition formed by the process of claim 1.
Claim 11
Dependent Claim
12 words
A coating composition in accordance with claim 9, wherein R is methyl.
Claim 12
Dependent Claim
43 words
A process in accordance with claim 1, wherein said composition is formed from a single silane, said process additionally including forming a second composition by repeating steps (a), (b), and (c) with a different silane represented by said formula, and combining said compositions.
Claim 13
Dependent Claim
10 words
A coating composition formed by the process of claim 11.
Claim 14
Dependent Claim
15 words
A coating composition in accordance with claim 12, wherein R represents methyl and isobutyl groups.
Claim 15
Dependent Claim
23 words
A coating composition in accordance with claim 13, wherein at least about 50 percent of the groups represented by R are isobutyl groups.
References Cited (Backward Citations)
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US4103065A
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US4197230A
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US4399266A
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |