Patent US4142032A successfully refreshed from Google Patents.
US4142032A
Expired / Lapsed
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Process for improving barrier properties of polymers
Assignee: Praxair Technology Inc
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Filing: 1977-12-29
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Granted: 1979-02-27
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Expires: 1997-12-29
Abstract
Abstract A process is provided for achieving significant improvements in the barrier properties of polymeric articles, such as films and containers, by surface treatment with both fluorine and bromine. The process is conducted at moderate temperatures, short treatment times and near one atmosphere pressure.
Inventors
- 👤 Paul F. D'Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:16
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/126; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A process for improving the barrier properties of at least one olefinic or styrene-containing polymer which comprises contacting said polymer with fluorine and a bromine source wherein: (a) the ratio in volume percent of fluorine to said bromine source is from about 0.1 to 1, to about 100 to 1, (b) the pressure does not substantially exceed about one atmosphere, (c) the temperature is from about 0° C. up to about the melting point of said polymer article, and (d) the treatment time is from about 1 minute or less to about 30 minutes, and thereafter recovering said article having improved barrier properties.
Claim 2
Dependent Claim
103 words
A process for improving the barrier properties of at least one olefinic or styrene-containing polymer which comprises contacting said polymer with fluorine and a bromine source wherein: (a) the ratio in volume percent of fluorine to said bromine source is from about 0.1 to 1, to about 100 to 1, (b) the pressure does not substantially exceed about one atmosphere, (c) the temperature is from about 0° C. up to about the melting point of said polymer article, and (d) the treatment time is from about 1 minute or less to about 30 minutes, and thereafter recovering said article having improved barrier properties.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said bromine source is molecular bromine.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said bromine source is trifluorobromomethane.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said bromine source is bromine chloride.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said bromine source is bromine iodide.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein said fluorine to bromine source ratio in volume percent is from about 1 to 1, to about 10 to 1.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said temperature is from about 20° to about 65° C.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein said treatment time is from about 1 to about 10 minutes.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said polymer is in the form of a film.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein said polymer is in the form of a container.
Claim 12
Dependent Claim
12 words
The process of claim 10 wherein said container is an aerosol bottle.
References Cited (Backward Citations)
US3647613A
Cited
US3862284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |