US5445894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic coatings
Assignee: Dow Silicones Corp
•
Filing: 1991-04-22
•
Granted: 1995-08-29
•
Expires: 2011-04-22
Abstract
Abstract The present invention relates to the application of ceramic coatings on substrates. The method comprises applying a preceramic coating comprising hydrogen silsesquioxane resin, a material containing Si-Si bonds which forms volatile SiH compounds, and a catalyst followed by pyrolyzing the preceramic coating in an inert atmosphere. The novel ceramic coatings formed by the process of this invention are especially valuable on electronic devices.
Inventors
- 👤 Loren A. Haluska
- 👤 Keith W. Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:37
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/04; C08G77/12; C09; C09D; C09D183/00; C09D183/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/1209
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
58 words
A method of forming a ceramic coating on a substrate comprising: depositing a preceramic coating comprising hydrogen silsesquioxane resin, a material containing Si--Si bonds which forms volatile SiH compounds, and a catalyst selected from the group consisting of platinum catalysts and copper catalysts; and pyrolyzing the preceramic coating in an inert atmosphere to a temperature sufficient for ceramification.
Claim 2
Independent Claim
58 words
A method of forming a ceramic coating on a substrate comprising: depositing a preceramic coating comprising hydrogen silsesquioxane resin, a material containing Si--Si bonds which forms volatile SiH compounds, and a catalyst selected from the group consisting of platinum catalysts and copper catalysts; and pyrolyzing the preceramic coating in an inert atmosphere to a temperature sufficient for ceramification.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the material containing Si--Si bonds comprises dodecamethyl cyclohexasilane.
Claim 4
Dependent Claim
49 words
The method of claim 2 wherein the preceramic coating is applied by a process which comprises coating the substrate with a solution comprising a solvent, hydrogen silsesquioxane resin, dodecamethyl cyclohexasilane, and a catalyst selected from the group consisting of platinum catalysts and copper catalysts and then evaporating the solvent.
Claim 5
Dependent Claim
65 words
The method of claim 3 wherein said solution contains between about 0.1 and about 50 weight percent solids of hydrogen silsesquioxane and dodecamethyl cyclohexasilane, the solvent is selected from the group consisting of aromatic hydrocarbons, alkanes, ketones, esters, cyclic dimethylpolysiloxanes and glycol ethers, and the ratio of dodecamethyl cyclohexasilane to hydrogen silsesquioxane resin is greater than about 1 mole cyclohexasilane per 25 moles Si--H units.
Claim 6
Dependent Claim
34 words
The method of claim 4 wherein the platinum or copper catalyst is present in an amount of between about 10 and about 1000 ppm of the metal based on the weight of hydrogen silsesquioxane.
Claim 7
Dependent Claim
27 words
The method of claim 2 wherein the coating is ceramified by heating to a temperature in the range of about 300° C. up to about 1000° C.
Claim 8
Dependent Claim
33 words
The method of claim 2 wherein the coating is ceramified by heating to a temperature in the range of about 200° C. up to about 1000° C. in the presence of UV light.
Claim 9
Dependent Claim
20 words
The method of claim 2 wherein the catalyst is selected from the group consisting of platinum acetylacetonate and cupric naphthenate.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein said substrate is an electronic device.
Claim 11
Dependent Claim
12 words
The method of claim 4 wherein said substrate is an electronic device.
Claim 12
Dependent Claim
9 words
A substrate coated by the method of claim 1.
Claim 13
Dependent Claim
9 words
A substrate coated by the method of claim 9.
Claim 14
Dependent Claim
9 words
A substrate coated by the method of claim 10.
Claim 15
Dependent Claim
34 words
A homogenous liquid composition comprising a solvent, hydrogen silsesquioxane resin, a material containing Si--Si bonds which forms volatile SiH compounds, and a catalyst selected from the group consisting of platinum catalysts and copper catalysts.
Claim 16
Dependent Claim
34 words
A homogenous liquid composition comprising a solvent, hydrogen silsesquioxane resin, a material containing Si--Si bonds which forms volatile SiH compounds, and a catalyst selected from the group consisting of platinum catalysts and copper catalysts.
Claim 17
Dependent Claim
14 words
The composition of claim 14 wherein the material containing Si--Si bonds comprises dodecamethyl cyclohexasilane.
Claim 18
Dependent Claim
25 words
The composition of claim 15 wherein said liquid composition contains between about 0.1 and about 50 weight percent solids of hydrogen silsesquioxane and dodecamethyl cyclohexasilane.
Claim 19
Dependent Claim
25 words
The composition of claim 15 wherein the solvent is selected from the group consisting of aromatic hydrocarbons, alkanes, ketones, esters, cyclic dimethylpolysiloxanes and glycol ethers.
Claim 20
Dependent Claim
27 words
The composition of claim 15 wherein the ratio of dodecamethyl cyclohexasilane to hydrogen silsesquioxane resin is greater than about 1 mole cyclohexasilane per 25 moles Si--H units.
Claim 21
Dependent Claim
34 words
The composition of claim 15 wherein the platinum or copper catalyst is present in an amount of between about 10 and about 1000 ppm of the metal based on the weight of hydrogen silsesquioxane.
Claim 22
Dependent Claim
20 words
The composition of claim 15 wherein the catalyst is selected from the group consisting of platinum acetylacetonate and cupric naphthenate.
References Cited (Backward Citations)
US4756977A
Cited
US5008204A
Cited
US4973526A
Cited
US5116637A
Cited
US5059448A
Cited
US5091162A
Cited
US5063267A
Cited
US5118530A
Cited
US5145723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |