US5569497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coating of plastic substrates via plasma-polymerization
Assignee: Arkema France SA
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Filing: 1994-10-31
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Granted: 1996-10-29
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Expires: 2014-10-31
Abstract
Abstract A protective layer or film is deposited onto a face surface of a plastic substrate, e.g., a PMMA shaped article, by (a) placing such plastic substrate on a weakly or unpolarized electrode comprising a plasma-generating circuit, (b) plasma-pretreating the plastic substrate in an oxygen plasma, under primary vacuum, by a pulse of electrical power density of such minimum magnitude as to oxygen-activate a face surface thereof, and (c) plasma-polymerizing at least one organosilicon monomer onto the face surface of said plastic substrate, also under vacuum and from an oxygen/organosilicon monomer plasma, whereby depositing a thin protective layer or film thereon.
Inventors
- 👤 Francis Verzaro
- 👤 Didier Ferry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:01
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; B; B05; B05D; B05D1/00; B05D1/62; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/144; C08J7/123; C23; C23C; C23C16/00; C23C16/02; C23C16/0227; C23C16/0245; C23C16/22; C23C16/30; C23C16/40; C23C16/401; H; H05; H05H; H05H1/00; H05H1/24; H05H1/46; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
101 words
A process for the deposition of a thin protective layer or film onto a face surface of a plastic substrate, which comprises (a) placing said plastic substrate on a weakly or unpolarized electrode comprising a plasma-generating circuit, (b) plasma-pretreating said plastic substrate in an oxygen plasma, under primary vacuum, by a pulse of electrical power density of such minimum magnitude as to oxygen-activate a face surface thereof, and (c) plasma-polymerizing at least one organosilicon monomer onto the face surface of said plastic substrate, also under vacuum and from an oxygen/organosilicon monomer plasma, whereby depositing said thin protective layer or film thereon.
Claim 2
Dependent Claim
101 words
A process for the deposition of a thin protective layer or film onto a face surface of a plastic substrate, which comprises (a) placing said plastic substrate on a weakly or unpolarized electrode comprising a plasma-generating circuit, (b) plasma-pretreating said plastic substrate in an oxygen plasma, under primary vacuum, by a pulse of electrical power density of such minimum magnitude as to oxygen-activate a face surface thereof, and (c) plasma-polymerizing at least one organosilicon monomer onto the face surface of said plastic substrate, also under vacuum and from an oxygen/organosilicon monomer plasma, whereby depositing said thin protective layer or film thereon.
Claim 3
Dependent Claim
19 words
The process as defined by claim 1, said weakly or unpolarized electrode comprising the anode of said plasma-generating circuit.
Claim 4
Dependent Claim
18 words
The process as defined by claim 1, said electrical power density being at least 50 mW/cm 3 .
Claim 5
Dependent Claim
21 words
The process as defined by claim 3, said electrical power density ranging from 80 mW/cm 3 to 500 mW/cm 3 .
Claim 6
Dependent Claim
17 words
The process as defined by claim 4, said electrical power density being about 165 mW/cm 3 .
Claim 7
Dependent Claim
24 words
The process as defined by claim 3, said electrical power density being of pulse duration of from about 1 second to about 100 seconds.
Claim 8
Dependent Claim
24 words
The process as defined by claim 6, said electrical power density being of pulse duration of from about 3 seconds to about 50 seconds.
Claim 9
Dependent Claim
22 words
The process as defined by claim 7, said electrical power density being of pulse duration on the order of about 30 seconds.
Claim 10
Dependent Claim
30 words
The process as defined by claim 1, said pretreatment oxygen plasma comprising oxygen, nitrous oxide, carbon monoxide or dioxide, water vapor, air, a rare gas, nitrogen, hydrogen or mixture thereof.
Claim 11
Dependent Claim
17 words
The process as defined by claim 1, said pretreatment oxygen plasma comprising at least one organosilicon compound.
Claim 12
Dependent Claim
22 words
The process as defined by claim 10, said at least one organosilicon compound comprising a silane, alkoxysilane, siloxane, silazane, or mixture thereof.
Claim 13
Dependent Claim
15 words
The process as defined by claim 11, said at least one organosilicon compound comprising hexamethyldisiloxane.
Claim 14
Dependent Claim
32 words
The process as defined by claim 1, said oxygen/organosilicon monomer plasma of polymerization comprising oxygen, nitrous oxide, carbon monoxide or dioxide, water vapor, air, a rare gas, nitrogen, hydrogen or mixture thereof.
Claim 15
Dependent Claim
22 words
The process as defined by claim 13, said oxygen/organosilicon monomer plasma of polymerization comprising a silane, alkoxysilane, siloxane, silazane, or mixture thereof.
Claim 16
Dependent Claim
15 words
The process as defined by claim 14, said oxygen/organosilicon monomer plasma of polymerization comprising hexamethyldisiloxane.
Claim 17
Dependent Claim
21 words
The process as defined by claim 1, said pretreatment oxygen plasma being the same as said oxygen/organosilicon monomer plasma of polymerization.
Claim 18
Dependent Claim
19 words
The process as defined by claim 1, wherein the plasma-generating frequency ranges from 0 Hz to a few GHz.
Claim 19
Dependent Claim
22 words
The process as defined by claim 1, said plastic substrate comprising a filled or unfilled polyolefin, polyacrylic, polycarbonate, or vinyl aromatic polymer.
Claim 20
Dependent Claim
18 words
The process as defined by claim 18, said plastic substrate comprising a polypropylene, polystyrene, or methyl methacrylate polymer.
Claim 21
Dependent Claim
40 words
The process as defined by claim 19, said plastic substrate comprising the copolymerizate of methyl methacrylate with a comonomer selected from among (meth)acrylic acid, hydroxyalkyl (meth)acrylate, alkoxyalkyl (meth)acrylate, (meth)acrylonitrile, (meth)acrylamide, maleimide, maleic anhydride, substituted or unsubstituted styrene, or a diene.
Claim 22
Dependent Claim
16 words
The process as defined by claim 18, such filled or unfilled polymer comprising glutarimide functional groups.
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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) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |