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Patent US4869922A successfully refreshed from Google Patents.
US4869922A
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Method of coating with polyfluorocarbons
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1988-08-23
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Granted: 1989-09-26
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Expires: 2008-08-23
Abstract
Abstract Films, layers, tapes, plates, and similar structures of metal or of plastic materials, coated with thin polyfluorocarbon films. These films, tapes, etc., are characterized in that no other materials are interposed; the polyfluorocarbon films are adherent and not porous, and have controlled wettability characteristics. The polyfluorocarbons have the formula (CF x ) n , wherein x is within the range of from 0.3 to 2.0, and are directly obtained on the substrate by the plasma-polymerization of gaseous streams of C 2 F 6 and H 2 ; C 2 F 6 and C 2 F 4 ; CF 4 and H 2 ; CF 4 and C 2 F 4 ; or of C 2 F 4 . The metal substrate may be, e.g., Al, Cu, Fe, tin-coated Fe, Si, noble metals and alloys thereof. The substrate of plastic materials may be constituted, e.g., by polytetrafluoroethylene, polypropylene, polyethylene, polyphenyloxide, polycarbonate, and neoprene.
Inventors
- 👤 Riccardo d'Agostino
- 👤 Francesco Cramarossa
- 👤 Francesco Fracassi
- 👤 Francesca Illuzzi
- 👤 Gerardo Caporiccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:31
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B05; B05D; B05D1/00; B05D1/62; C08F; C08F2/00; C08F2/46; C08F2/52; C23; C23C; C23C16/00; C23C16/44; C23C16/50; C23C16/505; C23C16/509; C23C16/5096; B05D2506/00; B05D2506/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
264 words
Process for coating films, layers, tapes, plates, and similar structures of metal or plastic materials with a thin polyfluorocarbon film characterized in that no other materials are interposed; the polyfluorocarbon films are adherent and non-porous, and have controlled wettability characteristics; the polyfluorocarbons have the formula (CF x ) n , where x is within the range of from 0.3 to 2.0, and are obtained directly on the substrate by the plasma-polymerization of gaseous streams of C 2 F 6 and H 2 ; or C 2 F 6 and C 2 F 4 ; or CF 4 and H 2 ; or CF 4 and C 2 F 4 ; or C 2 F 4 ; and wherein in said process a gaseous stream of C 2 F 6 and H 2 ; or C 2 F 6 and C 2 F 4 ; or CF 4 and H 2 ; or CF 4 and C 2 F 4 ; or C 2 F 4 is passed through a reactor provided with two electrodes, one of which is connected to a radio frequency current generator, and the other of which is connected to ground; the substrate is placed on one of the electrodes; the pressure of the gaseous stream is within the range of from 0.1 to 2 torr; a power densitiy of at least 1 watt/cm 2 is applied, the plasma being thus generated, and the consequent polymerization of the fluorocarbons being caused directly on the substrate, the temperature of which is maintained at values within the range of 20° to 120° C.
Claim 2
Dependent Claim
264 words
Process for coating films, layers, tapes, plates, and similar structures of metal or plastic materials with a thin polyfluorocarbon film characterized in that no other materials are interposed; the polyfluorocarbon films are adherent and non-porous, and have controlled wettability characteristics; the polyfluorocarbons have the formula (CF x ) n , where x is within the range of from 0.3 to 2.0, and are obtained directly on the substrate by the plasma-polymerization of gaseous streams of C 2 F 6 and H 2 ; or C 2 F 6 and C 2 F 4 ; or CF 4 and H 2 ; or CF 4 and C 2 F 4 ; or C 2 F 4 ; and wherein in said process a gaseous stream of C 2 F 6 and H 2 ; or C 2 F 6 and C 2 F 4 ; or CF 4 and H 2 ; or CF 4 and C 2 F 4 ; or C 2 F 4 is passed through a reactor provided with two electrodes, one of which is connected to a radio frequency current generator, and the other of which is connected to ground; the substrate is placed on one of the electrodes; the pressure of the gaseous stream is within the range of from 0.1 to 2 torr; a power densitiy of at least 1 watt/cm 2 is applied, the plasma being thus generated, and the consequent polymerization of the fluorocarbons being caused directly on the substrate, the temperature of which is maintained at values within the range of 20° to 120° C.
Claim 3
Dependent Claim
23 words
Process according to claim 1, characterized in that the power density is within the range of from 1 to 10 watts/cm 2 .
Claim 4
Dependent Claim
19 words
Process accoding to claim 1 or claim 2, characterized in that the two electrodes are parallel to each other.
Claim 5
Dependent Claim
29 words
Process according to claim 1 or claim 2, characterized in that the temperature of the substrate is maintained at values within the range of from 40° to 100° C.
Claim 6
Dependent Claim
40 words
Process according to claim 1 or claim 2, characterized in that a gaseous stream of C 2 F 6 and H 2 is used, the percentage of H 2 by volume being within the range of from 10 to 80%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |