US4756964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier films having an amorphous carbon coating and methods of making
Assignee: Dow Chemical Co
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Filing: 1986-09-29
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Granted: 1988-07-12
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Expires: 2006-09-29
Abstract
Abstract A barrier film having excellent low oxygen permeability is provided and includes a flexible polymeric substrate having an adherent amorphous carbon coating. The coating is applied by generating a gas plasma from a hydrocarbon gas within a coating chamber such that ions in the gas plasma impinge upon the polymeric substrate. A barrier film having an ultra low oxygen permeability is produced by coating a second polymeric substrate over the amorphous carbon coating.
Inventors
- 👤 Pamela J. J. Kincaid
- 👤 Virgil B. Kurfman
- 👤 Nick M. Sbrockey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:23
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B05; B05D; B05D1/00; B05D1/62; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/144; C08J7/04; C08J7/046; C08J7/048; C08J7/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/30; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
92 words
A method of depositing an amorphous carbon coating on a flexible polymeric substrate to make a barrier film having excellent oxygen permeability, comprising the steps of: (a) treating the surface of said polymeric substrate with an inert gas plasma for a time sufficient to improve the adhesive properties of said surface of said substrate: and (b) generating a gas plasma from a hydrocarbon gas adjacent said polymeric substrate, so that ions from said gas plasma from said hydrocarbon gas impinge upon said polymeric substrate to produce an inherent amorphous carbon coating thereon.
Claim 2
Independent Claim
92 words
A method of depositing an amorphous carbon coating on a flexible polymeric substrate to make a barrier film having excellent oxygen permeability, comprising the steps of: (a) treating the surface of said polymeric substrate with an inert gas plasma for a time sufficient to improve the adhesive properties of said surface of said substrate: and (b) generating a gas plasma from a hydrocarbon gas adjacent said polymeric substrate, so that ions from said gas plasma from said hydrocarbon gas impinge upon said polymeric substrate to produce an inherent amorphous carbon coating thereon.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the surface of said polymeric substrate is treated with said inert gas plasma for from about 1 to about 5 minutes.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said inert gas plasma is argon.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein steps (a) and (b) are carried out in separate plasma position chambers.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein said flexible polymeric substrate comprises polycarbonate, polyethylene, or polypropylene.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein the flexible polymeric substrate is a polycarbonate.
Claim 8
Dependent Claim
16 words
The method of claim 5 wherein the hydrocarbon gas is ethylene, methane, propane, n-butane, or hexane.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the hydrocarbon gas is ethylene.
Claim 10
Dependent Claim
21 words
The method of claim 7 wherein the thickness of the polymeric substrate ranges from about 0.01 millimeters to about 0.5 millimeters.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein the thickness of the polymeric substrate ranges from about 0.01 millimeters to about 0.20 millimeters.
Claim 12
Dependent Claim
20 words
The method of claim 10 wherein the thickness of the coating ranges from about 200 angstroms to about 800 angstroms.
Claim 13
Dependent Claim
19 words
The method of claim 1 including the step of coating a second polymeric material over said amorphous carbon coating.
Claim 14
Dependent Claim
15 words
The method of claim 1 wherein said amorphous carbon coating is optically transparent and non-conductive.
Claim 15
Dependent Claim
31 words
The method of claim 13 wherein the oxygen permeability of the coated polymeric substrate is less than about 5.0 cubic centimeters of oxygen per 100 square inches per day, per atmosphere.
Claim 16
Dependent Claim
42 words
A barrier film having low oxygen permeability, comprising: (a) a flexible polymeric substrate; and (b) a coating of an amorphous carbon adhered to said polymeric substrate, said coating being produced by the impingement of gas plasma ions formed from a hydrocarbon gas.
Claim 17
Dependent Claim
42 words
A barrier film having low oxygen permeability, comprising: (a) a flexible polymeric substrate; and (b) a coating of an amorphous carbon adhered to said polymeric substrate, said coating being produced by the impingement of gas plasma ions formed from a hydrocarbon gas.
Claim 18
Dependent Claim
19 words
The barrier film of claim 15 wherein the flexible polymeric substrate is formed from a polycarbonate, polyethylene or polypropylene.
Claim 19
Dependent Claim
13 words
The barrier film of claim 16 wherein the flexible polymeric substrate is polycarbonate.
Claim 20
Dependent Claim
37 words
The barrier film of claim 16 wherein the thickness of said polymeric substance ranges from about 0.01 millimeters to about 0.5 millimeters and the thickness of the coating ranges from about 200 angstroms to about 800 angstroms.
Claim 21
Dependent Claim
14 words
The barrier film of claim 15 wherein said coating is optically transparent and non-conductive.
Claim 22
Dependent Claim
31 words
The barrier film of claim 19 wherein the oxygen permeability of said film is less than about 5.0 cubic centimeters of oxygen per 100 square inches film per day, per atmosphere.
Claim 23
Dependent Claim
26 words
The barrier film of claim 15 further comprising a layer of a second flexible polymeric material adhered to said amorphous carbon coating for decreased oxygen permeability.
Claim 24
Dependent Claim
25 words
The barrier film of claim 21 wherein the thickness of said second layer of polymeric material ranges from about 0.01 millimeters to about 0.5 millimeters.
Claim 25
Dependent Claim
31 words
The barrier film of claim 21 wherein the oxygen permeability of said film is less than about 0.1 cubic centimeters of oxygen per 100 square inches film per day, per atmosphere.
Claim 26
Dependent Claim
24 words
The barrier of claim 23 wherein said flexible polymeric substrate comprises a polycarbonate material and said second layer of polymeric material comprises polyvinylidene chloride.
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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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |