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US5116665A
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Multilayer protective coating for a substrate, process for protecting a substrate by a plasma deposition of such a coating, coatings obtained and applications thereof
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1989-05-11
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Granted: 1992-05-26
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Expires: 2009-05-11
Abstract
Abstract The present invention relates to a multilayer protective coating for a substrate and a process for protecting a substrate by the deposition of a continuous, transparent, amorphous, inorganic coating essentially comprising silicon, carbon, nitrogen, oxygen and hydrogen by means of a plasma. The invention also concerns the application of the coatings according to the invention in the protection of substrates and in particular against electrostatic charges.
Inventors
- 👤 Jean-Marie Gauthier
- 👤 Francois Coeuret
- 👤 Claude Bonet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:12
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3429; C03C17/3435; C03C17/3441; C03C17/3482; C23C16/02; C23C16/0227; C23C16/0245; C23C16/308; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A coated body comprising a polymeric substrate having a surface coated with at least two silicon-based transparent layers each formed of a deposited material consisting essentially of silicon, carbon, nitrogen, oxygen and hydrogen, a first of said layers, deposited on the substrate surface being formed of a material having the formula SiC x N y O z H t , in which x does not exceed 0.5; y does not exceed 0.15; z is 0.6-0.8 and t is 0.6-1.2, wherein a second said layer, deposited on said first layer, is formed of a material having the formula SiC x' C x' N y' O z' H t' , in which x' does not exceed 0.5; y' is 0.3-0.8; z' is 1.3-2.5 and t' is 0.5-1.2, and wherein the thickness of the first layer is between 1 and 30 nm and the thicknes of the second layer is 1.25-1.5 μm.
Claim 2
Dependent Claim
149 words
A coated body comprising a polymeric substrate having a surface coated with at least two silicon-based transparent layers each formed of a deposited material consisting essentially of silicon, carbon, nitrogen, oxygen and hydrogen, a first of said layers, deposited on the substrate surface being formed of a material having the formula SiC x N y O z H t , in which x does not exceed 0.5; y does not exceed 0.15; z is 0.6-0.8 and t is 0.6-1.2, wherein a second said layer, deposited on said first layer, is formed of a material having the formula SiC x' C x' N y' O z' H t' , in which x' does not exceed 0.5; y' is 0.3-0.8; z' is 1.3-2.5 and t' is 0.5-1.2, and wherein the thickness of the first layer is between 1 and 30 nm and the thicknes of the second layer is 1.25-1.5 μm.
Claim 3
Dependent Claim
19 words
A body according to claim 1, wherein x' is 0.3-1; y' is 0.5-0.8; z' is 1.3-2; t' is 0.6-1.
Claim 4
Dependent Claim
19 words
A body according to claim 1, wherein the thickness of the first layer is between 5 and 20 nm.
Claim 5
Dependent Claim
12 words
A body according to claim 1, wherein said polymeric substrate is transparent.
Claim 6
Dependent Claim
13 words
A body according to claim 4, wherein said polymeric substrate is a polycarbonate.
Claim 7
Dependent Claim
19 words
A body according to claim 1, wherein the first and second layers are each plasma deposited from precursor gases.
Claim 8
Dependent Claim
147 words
A coated body comprising a transparent polymeric substrate having a surface and at least first and second layers of silicon-based amorphous polymer superimposed on the surface, the first layer being deposited on said surface and having a thickness not exceeding 0.030 μm, the second layer being deposited on the first layer and having a thickness greater than 1 μm, wherein the first layer is formed of a material having the formula SiC x N y O z H t , in which x does not exceed 0.5; y does not exceed 0.15; z is comprised between 0.4-1 and t is comprised between 0.6-1.2, and the second layer is formed of a material having the formula SiC x' N y' O z' H t' , in which x' does not exceed 0.5; y' is comprised between 0.3-0.8; z' is comprised between 1.3-2.5 and t' is comprised between 0.5-1.2.
Claim 9
Dependent Claim
147 words
A coated body comprising a transparent polymeric substrate having a surface and at least first and second layers of silicon-based amorphous polymer superimposed on the surface, the first layer being deposited on said surface and having a thickness not exceeding 0.030 μm, the second layer being deposited on the first layer and having a thickness greater than 1 μm, wherein the first layer is formed of a material having the formula SiC x N y O z H t , in which x does not exceed 0.5; y does not exceed 0.15; z is comprised between 0.4-1 and t is comprised between 0.6-1.2, and the second layer is formed of a material having the formula SiC x' N y' O z' H t' , in which x' does not exceed 0.5; y' is comprised between 0.3-0.8; z' is comprised between 1.3-2.5 and t' is comprised between 0.5-1.2.
Claim 10
Dependent Claim
26 words
The body of claim 7, wherein the transparent polymeric substrate is selected from the group consisting of polycarbonate, acrylonitrile polystyrene, crystalline polystyrene, polyimide, polyamide and polyester.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |