US4508781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination by inorganic fluorides in glow discharge
Assignee: United States Department of Agriculture
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Filing: 1982-06-07
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Granted: 1985-04-02
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Expires: 2002-06-07
Abstract
Abstract A process for the surface fluorination of a carbon containing synthetic or natural polymer capable of forming a carbon-fluoride bond on fluorination, in a glow discharge reactor, utilizing inorganic fluorides as the fluorination agent.
Inventors
- 👤 Toshiharu Yagi
- 👤 Attila E. Pavlath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:17
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B29; B29C; B29C59/00; B29C59/14; C08J7/126; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31536; Y10T428/3154
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
An essentially surface fluorinated carbon containing synthetic or natural polymer, the fluorinated surface of which is comprised of carbon-fluorine entities and has a ratio of fluorine to carbon in the range of about 1.14 to about 1.82, the surface of said polymer prior to fluorination being capable of forming a carbon-fluorine bond on fluorination with fluorine radicals derived from inorganic fluoride vapors dissociated in an activated glow discharge reactor.
Claim 2
Dependent Claim
69 words
An essentially surface fluorinated carbon containing synthetic or natural polymer, the fluorinated surface of which is comprised of carbon-fluorine entities and has a ratio of fluorine to carbon in the range of about 1.14 to about 1.82, the surface of said polymer prior to fluorination being capable of forming a carbon-fluorine bond on fluorination with fluorine radicals derived from inorganic fluoride vapors dissociated in an activated glow discharge reactor.
Claim 3
Dependent Claim
19 words
An essentially surface fluorinated carbon containing polymer is described in claim 1 wherein said polymer is a synthetic polymer.
Claim 4
Dependent Claim
33 words
An essentially surface fluorinated carbon containing polymer as described in claim 2 wherein the critical surface tension of said fluorinated surface is in the range of from about 20.8 to about 22.4 dynes/cm.
Claim 5
Dependent Claim
18 words
An essentially surface fluorinated carbon containing polymer as described in claim 2 wherein said synthetic polymer is polyethylene.
Claim 6
Dependent Claim
18 words
An essentially surface fluorinated carbon containing polymer as described in claim 2 wherein said synthetic polymer is polypropylene.
Claim 7
Dependent Claim
19 words
An essentially surface fluorinated carbon containing polymer as described in claim 1 wherein said polymer is a natural polymer.
Claim 8
Dependent Claim
18 words
An essentially surface fluorinated carbon containing polymer as described in claim 6 wherein said natural polymer is wool.
Claim 9
Dependent Claim
18 words
An essentially surface fluorinated carbon containing polymer as described in claim 6 wherein said natural polymer is cotton.
Claim 10
Dependent Claim
52 words
An essentially surface fluorinated carbon containing synthetic or natural polymer, the fluorinated surface of which has been obtained by: a. introducing a polymer surface to be fluorinated into an activated glow discharge reactor, and b. subjecting said surface within said reactor to dissociated inorganic fluoride vapors for a predetermined exposure time period.
Claim 11
Dependent Claim
52 words
An essentially surface fluorinated carbon containing synthetic or natural polymer, the fluorinated surface of which has been obtained by: a. introducing a polymer surface to be fluorinated into an activated glow discharge reactor, and b. subjecting said surface within said reactor to dissociated inorganic fluoride vapors for a predetermined exposure time period.
Claim 12
Dependent Claim
30 words
An essentially surface fluorinated carbon containing polymer as described in claim 9 wherein said inorganic fluoride is selected from the group consisting of nitrogen trifluoride, boron trifluoride and silicon tetrafluoride.
Claim 13
Dependent Claim
19 words
An essentially surface fluorinated carbon containing polymer as described in claim 9 wherein said inorganic fluoride is nitrogen trifluoride.
Claim 14
Dependent Claim
19 words
An essentially surface fluorinated carbon containing polymer as described in claim 11 wherein said polymer is a synthetic polymer.
Claim 15
Dependent Claim
18 words
An essentially surface fluorinated carbon containing polymer as described in claim 12 wherein said synthetic polymer is polyethylene.
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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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |