US5866197A
Expired / Lapsed
US
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Method for producing thick crack-free coating from hydrogen silsequioxane resin
Assignee: Dow Silicones Corp
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Filing: 1997-06-06
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Granted: 1999-02-02
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Expires: 2017-06-06
Abstract
Abstract This invention pertains to a method for producing crack-free, insoluble, greater than 1.25 mu m thick coatings from hydrogen silsesquioxane resin compositions. The method for producing the coating comprises applying a fillerless hydrogen silsesquioxane resin composition onto a substrate and thereafter heating the hydrogen silsesquioxane resin at a temperature of less than 500 DEG C. for a controlled period of time to produce the crack-free coating having a thickness of greater than 1.25 mu m. The resins may be cured in an inert or oxygen containing environment.
Inventors
- 👤 Jeffrey Nicholas Bremmer
- 👤 Kyuha Chung
- 👤 Chandan Kumar Saha
- 👤 Michael John Spaulding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:29
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; H10P14/6925; H10P14/63; H10P14/6326; H10P14/65; H10P14/6516; H10P14/6529; H10P14/6342; H10P14/66; H10P14/668; H10P14/6681; H10P14/6684; H10P14/6686; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
67 words
A method of producing a coating comprising applying a fillerless composition comprising hydrogen silsesquioxane resin onto a substrate to form a film of at least 1.25 μm thick heating the film at a temperature of 150° C. to 500° C. in an inert or oxygen containing environment for a time sufficient to produce an insoluble coating free of cracks having a thickness of at least 1.25 μm.
Claim 2
Independent Claim
67 words
A method of producing a coating comprising applying a fillerless composition comprising hydrogen silsesquioxane resin onto a substrate to form a film of at least 1.25 μm thick heating the film at a temperature of 150° C. to 500° C. in an inert or oxygen containing environment for a time sufficient to produce an insoluble coating free of cracks having a thickness of at least 1.25 μm.
Claim 3
Dependent Claim
60 words
The method as claimed in claim 1 wherein the hydrogen silsesquioxane resin consists of units of the formula HSi(OH) x (OR) y O z/2 wherein each R is independently an organic group or a substituted organic group which, when bonded to silicon through the oxygen atom, forms a hydrolyzable substituent, x=0 to 2, y=0 to 2, z=1 to 3, x+y+z=3.
Claim 4
Dependent Claim
26 words
The method as claimed in claim 2 wherein the hydrogen silsesquioxane resin is of the formula (HSiO 3/2 ) n where n is 8 or greater.
Claim 5
Dependent Claim
14 words
The method as claimed in claim 1 wherein the composition also contains a solvent.
Claim 6
Dependent Claim
25 words
The method as claimed in claim 1 wherein the composition also contains a solvent and the solvent is removed after application and prior to heating.
Claim 7
Dependent Claim
14 words
The method as claimed in claim 4 wherein the solvent is a linear dimethylpolysiloxane.
Claim 8
Dependent Claim
20 words
The method as claimed in claim 4 wherein the composition contains from 50 to 80 wt % of a solvent.
Claim 9
Dependent Claim
15 words
The method as claimed in claim 1 wherein the composition is applied by spin coating.
Claim 10
Dependent Claim
15 words
The method as claimed in claim 4 wherein the composition is applied by spin coating.
Claim 11
Dependent Claim
22 words
The method as claimed in claim 1 wherein the film is heated at a temperature of from 200° C. to 400° C.
Claim 12
Dependent Claim
22 words
The method as claimed in claim 1 wherein the film is heated at a temperature of from 300° C. to 380° C.
Claim 13
Dependent Claim
16 words
The method as claimed in claim 1 wherein the film is heated in an inert environment.
Claim 14
Dependent Claim
13 words
The method as claimed in claim 12 wherein the inert environment is nitrogen.
Claim 15
Dependent Claim
17 words
The method as claimed in claim 1 wherein the film is heated in an oxygen containing environment.
Claim 16
Dependent Claim
14 words
The method as claimed in claim 14 wherein the oxygen containing environment is air.
Claim 17
Dependent Claim
26 words
The method as claimed in claim 1 wherein the film is heated to a temperature of 150° C. to 330° C. in an oxygen containing environment.
Claim 18
Dependent Claim
19 words
The method as claimed in claim 1 wherein the insoluble coating has a thickness of 1.25 to 10 μm.
Claim 19
Dependent Claim
19 words
The method as claimed in claim 1 wherein the insoluble coating has a thickness of 1.5 to 2.2 μm.
Claim 20
Dependent Claim
14 words
The method as claimed in claim 1 wherein the substrate is an electronic substrate.
Claim 21
Dependent Claim
18 words
The method as claimed in claim 19 wherein the composition is applied on an electronic substrate over metallization.
Claim 22
Independent Claim
77 words
A method of producing a coating comprising the steps of (A) applying a fillerless composition comprising hydrogen silsesquioxane resin onto a substrate to form a film; (B) heating the film at a temperature of 150° C. to 500° C. in an inert or oxygen containing environment for a time sufficient to produce an insoluble coating free of cracks; and (c) repeating steps (A) and (B) until the insoluble coating has a thickness of 1.25 to 10 μm.
Claim 23
Independent Claim
77 words
A method of producing a coating comprising the steps of (A) applying a fillerless composition comprising hydrogen silsesquioxane resin onto a substrate to form a film; (B) heating the film at a temperature of 150° C. to 500° C. in an inert or oxygen containing environment for a time sufficient to produce an insoluble coating free of cracks; and (c) repeating steps (A) and (B) until the insoluble coating has a thickness of 1.25 to 10 μm.
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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) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |