US4762730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing transparent protective coatings from silicon compounds
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1986-09-03
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Granted: 1988-08-09
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Expires: 2006-09-03
Abstract
Abstract A method for producing a transparent protective coating on a plastic optical substrate surface is disclosed. In particular, a substrate is positioned between two electrodes on the cathode in a reaction chamber. Once positioned, a noble gas is introduced into the chamber and the surface of the plastic optical substrate is bombarded. A monomeric organic compound of either siloxane or silazane is introduced into the reaction chamber and a bias voltage of a value in the range of 80 to 500 volts is obtained to polymerize the compound on the substrate surface. Following the beginning of this polymerization, oxygen is introduced into the reaction chamber in an amount of about 5 times the amount of the monomeric organic compound to form a mixture with the compound.
Inventors
- 👤 Knut Enke
- 👤 Walter Zultzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B05; B05D; B05D1/00; B05D1/62; B29; B29D; B29D11/00; B29D11/00865; C09; C09D; C09D4/00; G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A method for producing a transparent protective coating on a surface of a plastic optical substrate in a reaction chamber having at least two electrodes of opposed polarity, one of the electrodes functioning as a cathode, the method comprising the following steps: (a) positioning the substrate on the cathode in the reaction chamber; (b) introducing a noble gas into the reaction chamber; (c) exposing the surface of the plastic optical substrate to ion bombardment in the noble gas plasma, the ion bombardment being produced between the electrodes by a bias voltage formed at the cathode by a radiofrequency means; (d) introducing a monomeric organic compound into the reaction chamber comprising a member of the group of siloxane and silazane, the organic compound being polymerized by the plasma to coat the surface of the plastic optical substrates; (e) setting the bias voltage at the cathode at a value in the range of -80 to -500 volts; and (f) introducing oxygen into the reaction chamber during polymerization of the monomeric organic compound, the oxygen having a partial pressure of at least five times the partial pressure of the monomeric organic compound to form a mixture with the compound.
Claim 2
Independent Claim
196 words
A method for producing a transparent protective coating on a surface of a plastic optical substrate in a reaction chamber having at least two electrodes of opposed polarity, one of the electrodes functioning as a cathode, the method comprising the following steps: (a) positioning the substrate on the cathode in the reaction chamber; (b) introducing a noble gas into the reaction chamber; (c) exposing the surface of the plastic optical substrate to ion bombardment in the noble gas plasma, the ion bombardment being produced between the electrodes by a bias voltage formed at the cathode by a radiofrequency means; (d) introducing a monomeric organic compound into the reaction chamber comprising a member of the group of siloxane and silazane, the organic compound being polymerized by the plasma to coat the surface of the plastic optical substrates; (e) setting the bias voltage at the cathode at a value in the range of -80 to -500 volts; and (f) introducing oxygen into the reaction chamber during polymerization of the monomeric organic compound, the oxygen having a partial pressure of at least five times the partial pressure of the monomeric organic compound to form a mixture with the compound.
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the siloxane is hexamethyldisiloxane of the formula: (CH.sub.3).sub.3 --Si--O--Si--(CH.sub.3).sub.3.
Claim 4
Dependent Claim
36 words
The method according to claim 1, wherein the setting step (e) further comprises: setting the bias voltage of the cathode to a value in the range of -80 to -250 volts to produce the ion bombardment.
Claim 5
Dependent Claim
25 words
The method according to claim 1, wherein the monomeric organic compound is polymerized at a pressure having a range of 10 -3 to 10 mbar.
Claim 6
Dependent Claim
46 words
The method according to claim 1, wherein the introducing of oxygen of step (f) further comprises: introducing oxygen into the reaction chamber having a partial pressure of at least five times higher than a partial pressure of the monomeric organic compound introduced into the reaction chamber.
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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) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |