US5041303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for modifying large polymeric surfaces
Assignee: Polyplasma Inc
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Filing: 1988-03-07
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Granted: 1991-08-20
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Expires: 2008-03-07
Abstract
Abstract The disclosure herein describes a process for modifying large polymeric surfaces; a thin, uniform coating is deposited at near ambient temperature on the surfaces in a large-volume plasma apparatus, the plasma state being produced by using electromagnetic energy in the microwave frequency range. The surfaces thus coated constitute a barrier against permeation by oxygen and moisture.
Inventors
- 👤 Michael R. Wertheimer
- 👤 Henry P. Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:54
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/401; C23C16/44; C23C16/50; C23C16/511
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
67 words
A method of providing a plasma generated thin permeation barrier, against transmission of a gas or vapor, on a large polymeric surface, said method comprising: depositing a film by plasma at substantially ambient temperature on said surface, said plasma being produced by electromagnetic energy in the microwave frequency range using slow wave structure applicator means; whereby to form on said surface said plasma generated thin permeation barrier.
Claim 2
Independent Claim
67 words
A method of providing a plasma generated thin permeation barrier, against transmission of a gas or vapor, on a large polymeric surface, said method comprising: depositing a film by plasma at substantially ambient temperature on said surface, said plasma being produced by electromagnetic energy in the microwave frequency range using slow wave structure applicator means; whereby to form on said surface said plasma generated thin permeation barrier.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1, wherein said barrier is one against transmission of oxygen, carbon dioxide and water vapor.
Claim 4
Dependent Claim
14 words
A method as defined in claim 2, wherein said barrier is an inorganic film.
Claim 5
Dependent Claim
46 words
A method as defined in claim 3, wherein said barrier is a silicon compound made by co-reacting silane with a second gas, or gas mixture, chosen among the following group: ammonia, nitrogen, nitrous oxide or other oxides of nitrogen, water vapor, hydrocarbon and an inert gas.
Claim 6
Dependent Claim
25 words
A method as defined in claim 4, wherein said second gas, or gas mixture, is nitrogen and ammonia; said inorganic film being plasma silicon nitride.
Claim 7
Dependent Claim
29 words
A method as defined in claim 4, wherein said second gas is nitrous oxide or other oxide of nitrogen, or water vapor; said inorganic film being plasma silicon dioxide.
Claim 8
Dependent Claim
31 words
A method as defined in claim 4, wherein said second gas is a mixture comprising a source of nitrogen and a source of oxygen, said inorganic film being plasma silicon oxynitride.
Claim 9
Dependent Claim
26 words
A method as defined in claim 4, wherein said second gas is a hydrocarbon or other source of carbon; said inorganic film being plasma silicon carbide.
Claim 10
Dependent Claim
25 words
A method as defined in claim 4, wherein said second gas is a mixture of nitrous oxide and phosphine; said inorganic film being phosphosilicate glass.
Claim 11
Dependent Claim
29 words
A method as defined in claim 4, wherein said second gas is taken from the group including Ar, He, Ne and hydrogen; said inorganic film being amorphous, hydrogenated silicon.
Claim 12
Dependent Claim
21 words
A method as defined in claim 3, wherein said inorganic film is a metal compound made from a volatile organometallic compound.
Claim 13
Dependent Claim
16 words
A method as defined in claim 1, wherein said barrier is derived from an organosilicon monomer.
Claim 14
Dependent Claim
19 words
A method as defined in claim 12, wherein said monomer is reacted in the presence of an inert gas.
Claim 15
Dependent Claim
19 words
A method as defined in claim 12, wherein said monomer is reacted with oxygen to yield plasma silicon oxide.
Claim 16
Dependent Claim
21 words
A method as defined in claim 12, wherein said monomer is reacted with oxygen and ammonia to yield plasma silicon oxynitride.
Claim 17
Dependent Claim
21 words
A method as defined in claim 12, wherein said monomer is reacted with oxygen and nitrogen to yield plasma silicon oxynitride.
Claim 18
Dependent Claim
15 words
A method as defined in claim 1, wherein said large surface consists of polyethylene terephthalate.
Claim 19
Dependent Claim
14 words
A method as defined in claim 1, wherein said large surface consists of polycarbonate.
Claim 20
Dependent Claim
14 words
A method as defined in claim 1, wherein said large surface consists of polypropylene.
Claim 21
Dependent Claim
14 words
A method as defined in claim 1, wherein said large surface consists of polyethylene.
Claim 22
Dependent Claim
15 words
A method as defined in claim 1, wherein said large surface consists of polyvinyl chloride.
Claim 23
Dependent Claim
27 words
A method as defined in claim 1, wherein said large surfaces consist of polyacetal, polyamide, laminates of two or more polymers, and polyblends, polyalloys, interpenetrating network polymers.
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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) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |