US5165972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated glass
Assignee: Pilkington Group Ltd
•
Filing: 1992-03-27
•
Granted: 1992-11-24
•
Expires: 2012-03-27
Abstract
Abstract The invention relates to barrier coatings to prevent migration of alkali metal ions from a glass surface. The barrier coatings are deposited by pyrolysis of a silane gas on the glass surface above 600° C. in the presence of a gaseous electron donating compound, whereby oxygen from the glass is incorporated with silicon to form a transparent barrier coating up to 50 nm thick on the glass surface. The barrier coatings are used to prevent migration of alkali metal ions into overlying layers sensitive to alkali metal ions e.g. in glass coated with electroconductive or infra red reflecting coatings, and in liquid crystal displays.
Inventors
- 👤 David A. Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:46
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3417; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; C09; C09K; C09K2323/00; C09K2323/03; C09K2323/033; G02F1/133337; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
151 words
A method of making coated flat glass up to 6 mm thick with reduced diffusion of alkali metal ions from the glass into an overlying layer sensitive to the diffusion of alkali metal ions that the glass contains, which method comprises providing between the glass and said overlying layer a transparent barrier coating up to 50 nm thick containing silicon and oxygen applied by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound, whereby oxygen from the glass is incorporated with silicon to form a transparent barrier coating on the glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that when the coating is present on the clear flat glass which has a thickness of up to 6 mm, the coated glass has a light transmission of at least 80%.
Claim 2
Independent Claim
151 words
A method of making coated flat glass up to 6 mm thick with reduced diffusion of alkali metal ions from the glass into an overlying layer sensitive to the diffusion of alkali metal ions that the glass contains, which method comprises providing between the glass and said overlying layer a transparent barrier coating up to 50 nm thick containing silicon and oxygen applied by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound, whereby oxygen from the glass is incorporated with silicon to form a transparent barrier coating on the glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that when the coating is present on the clear flat glass which has a thickness of up to 6 mm, the coated glass has a light transmission of at least 80%.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the silane gas is monosilane (SiH 4 ).
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein the silane is diluted with an inert gas.
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein the electron donating compound is oxygen free.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein the gaseous electron donating compound is an olefin containing 2 to 4 carbon atoms.
Claim 7
Dependent Claim
14 words
A method according to claim 5 wherein the gaseous electron donating compound is ethylene.
Claim 8
Dependent Claim
24 words
A method according to claim 1 wherein the ratio of the gaseous electron donating compound to silane is from 0.5:1 to 15:1 by volume.
Claim 9
Dependent Claim
15 words
A method according to claim 1 wherein the glass is up to 2 mm thick.
Claim 10
Dependent Claim
32 words
A method according to claim 1, wherein the barrier coating is applied to a ribbon of float glass as it is advanced over the molten metal bath on which it is formed.
Claim 11
Dependent Claim
56 words
A method according to claim 1, wherein the ratio of the gaseous electron donating compound to silane is from 0.5:1 to 15:1 by volume, and the transparent barrier coating is applied to a ribbon of float glass up to 2 mm thick as it is advanced over the molten metal bath on which it is formed.
Claim 12
Independent Claim
135 words
A method of making coated flat glass, up to 6 mm thick, that contains alkali metal ions, which method comprises pyrolysing a silane gas of the glass surface above 60° C. in the presence of a gas electron donating compound, whereby oxygen from the glass is incorporated with silicon to form on the glass surface a transparent barrier coating up to 50 nm thick containing silicon and oxygen, and applying a layer sensitive to the diffusion of alkali metal ions from the glass over the coated glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that when the coating is present on the clear flat glass which has a thickness of up to 6 mm, the coated glass has a light transmission of at least 80%.
Claim 13
Independent Claim
135 words
A method of making coated flat glass, up to 6 mm thick, that contains alkali metal ions, which method comprises pyrolysing a silane gas of the glass surface above 60° C. in the presence of a gas electron donating compound, whereby oxygen from the glass is incorporated with silicon to form on the glass surface a transparent barrier coating up to 50 nm thick containing silicon and oxygen, and applying a layer sensitive to the diffusion of alkali metal ions from the glass over the coated glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that when the coating is present on the clear flat glass which has a thickness of up to 6 mm, the coated glass has a light transmission of at least 80%.
Claim 14
Dependent Claim
15 words
A method according to claim 11 wherein the silane gas is monosilane (SiH 4 ).
Claim 15
Dependent Claim
15 words
A method according to claim 11 wherein the silane is diluted with an inert gas.
Claim 16
Dependent Claim
14 words
A method according to claim 11 wherein the electron donating compound is oxygen free.
Claim 17
Dependent Claim
21 words
A method according to claim 11 wherein the gaseous electron donating compound is an olefin containing 2 to 4 carbon atoms.
Claim 18
Dependent Claim
14 words
A method according to claim 15 wherein the gaseous electron donating compound is ethylene.
Claim 19
Dependent Claim
24 words
A method according to claim 11 wherein the ratio of the gaseous electron donating compound to silane is from 0.5:1 to 15:1 by volume.
Claim 20
Dependent Claim
15 words
A method according to claim 11 wherein the glass is up to 2 mm thick.
Claim 21
Dependent Claim
32 words
A method according to claim 11 wherein the barrier coating is applied to a ribbon of float glass as it is advanced over the molten metal bath on which it is formed.
Claim 22
Dependent Claim
56 words
A method according to claim 11 wherein the ratio of the gaseous electron donating compound to silane is from 0.5:1 to 15:1 by volume, and the transparent barrier coating is applied to a ribbon of float glass up to 2 mm thick as it is advanced over the molten metal bath on which it is formed.
Claim 23
Dependent Claim
22 words
A method according to claim 11 which comprises applying a light transmitting layer of a doped metal oxide over the barrier coating.
Claim 24
Dependent Claim
150 words
A liquid crystal display device comprising two opposed electroconductive layers with a liquid crystal material between the layers and an alignment layer over each said electroconductive layer in contact with the liquid crystal material, in which at least one of said electroconductive layers is supported on a glass substrate up to 2 mm thick containing alkali metal ions, and, between said electroconductive layer and the glass, there is provided a transparent barrier coating up to 50 nm thick containing silicon and oxygen deposited on the glass surface above 600° C. by pyrolysis of silane in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
Claim 25
Dependent Claim
150 words
A liquid crystal display device comprising two opposed electroconductive layers with a liquid crystal material between the layers and an alignment layer over each said electroconductive layer in contact with the liquid crystal material, in which at least one of said electroconductive layers is supported on a glass substrate up to 2 mm thick containing alkali metal ions, and, between said electroconductive layer and the glass, there is provided a transparent barrier coating up to 50 nm thick containing silicon and oxygen deposited on the glass surface above 600° C. by pyrolysis of silane in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
Claim 26
Dependent Claim
115 words
Electroconductive flat glass comprising a glass substrate containing alkali metal ions, coated with a transparent barrier coating up to 50 nm thick containing silicon and oxygen by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, and an electroconductive metal oxide layer having a resistivity of less than 500 ohms per square over the barrier layer, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
Claim 27
Dependent Claim
115 words
Electroconductive flat glass comprising a glass substrate containing alkali metal ions, coated with a transparent barrier coating up to 50 nm thick containing silicon and oxygen by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, and an electroconductive metal oxide layer having a resistivity of less than 500 ohms per square over the barrier layer, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
Claim 28
Dependent Claim
112 words
Infra red reflecting flat glass comprising a glass substrate containing alkali metal ions, coated with a transparent barrier layer up to 50 nm thick containing silicon and oxygen by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, and a light transmitting infra red reflecting doped metal oxide layer over the barrier coating, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
Claim 29
Dependent Claim
112 words
Infra red reflecting flat glass comprising a glass substrate containing alkali metal ions, coated with a transparent barrier layer up to 50 nm thick containing silicon and oxygen by pyrolysis of a silane gas on a glass surface above 600° C. in the presence of a gaseous electron donating compound whereby oxygen from the glass is incorporated with silicon to form the transparent barrier coating on the glass surface, and a light transmitting infra red reflecting doped metal oxide layer over the barrier coating, the electron-donating compound being used in a proportion to silane to produce a transparent coating such that the coated glass has a light transmission of at least 80%.
References Cited (Backward Citations)
US4019887A
Cited
US4144684A
Cited
US4188444A
Cited
US4100330A
Cited
GB1602217A
Cited
US4385806A
Cited
GB2031756A
Cited
US4485146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-24 | 1996-05-25 | 1996-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-24 | 2000-05-25 | 2000-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-24 | 2004-05-25 | 2004-11-24 | $7700.00 | Window Closed / Lapsed |