US3645779A
Expired / Lapsed
US
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Method of coating a transparent synthetic polymer substrate with glass boron oxide-silicon dioxide
Assignee: Leybold Heraeus Verwaltung GmbH
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Filing: 1969-07-11
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Granted: 1972-02-29
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Expires: 1989-07-11
Abstract
Abstract A synthetic polymer substrate is provided with a hard, abrasionresistant surface free of fine hairline cracks by vapor depositing under vacuum for degassing, onto the surface a B2O3SiO2 glass containing less than 5 percent by weight of Na2O. The deposited glass coating has a temperature coefficient of expansion which more nearly corresponds to that of the substrate than does SiO2.
Inventors
- 👤 Gerhard Kienel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:13
CPC Classifications
C; C03; C03C; C03C1/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31616; Y10T428/31645
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
A method according to claim 1 wherein the substrate is a member selected from the group consisting of polycarbonate, polymethylmethacrylate, diallylglycolcarbonate and polystyrene.
Claim 2
Dependent Claim
43 words
A method according to claim 1 wherein the B2O3 content of the glass is adjusted so that said glass coating resulting therefrom has a coefficient of expansion which is closer to that of the substrate than is the coefficient of expansion of SiO2.
Claim 3
Dependent Claim
24 words
A method according to claim 3 wherein the vapor deposition is effected in a high vacuum of less than 5 X 10 4 torr.
Claim 4
Dependent Claim
29 words
A method according to claim 3 wherein the direction of impingement of the vapor stream of the molten glass onto the surface of the thermoplastic substrate is approximately 90*.
Claim 5
Dependent Claim
12 words
A method according to claim 5 wherein said direction is 90* .
Claim 6
Dependent Claim
16 words
A method according to claim 1, said glass containing between 10 and 70 percent boron oxide.
Claim 7
Dependent Claim
16 words
A method according to claim 7, said glass containing between 30 and 50 percent boron oxide.
Claim 8
Dependent Claim
20 words
A method according to claim 1, said glass consisting of B2O3, and less than 5 percent by weight of Na2O.
Claim 9
Dependent Claim
83 words
A method according to claim 1, said glass containing between 10 and 70 percent boron oxide, said vacuum for degassing being between 5 X 10 4 torr to 8 X 10 5 torr the B2O3 content of the glass being adjusted so that said glass coating has a coefficient of expansion which is closer to that of the substrate than is the coefficient of expansion of Si02, the vapor depositing being effected in a vacuum of less than 5 X 10 4 torr.
Claim 10
Dependent Claim
23 words
A method according to claim 10, the vapor deposition being effected in a vacuum from 2 X 10 4 to 10 5 torr.
Claim 11
Dependent Claim
150 words
A method according to claim 10, said glass containing 40 percent boron oxide and being prepared from a mixture of 50 percent of B2O3 of a grain size distribution between 20 and 30 Mu and 50 percent SiO2 of about the same grain size by melting at 1,550* C. under a vacuum for degassing increased from 5 X 10 4 10 torr to 8 X 10 5 torr, the molten mixture being held at 1, 550* C. for 10 minutes and then cooled to glass; the substrate being polycarbonate having a coefficient of expansion of 6.5 X 10 5 per * C.; the vapor depositing being done using an electron beam at a pressure as low as 5 X 10 5 torr to provide a coating thickness of 3 Mu ; the coated substrate being allowed to remain under vacuum for some five minutes following the deposition of the coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |