Patent US4902444A successfully refreshed from Google Patents.
US4902444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive fluoropolymers
Assignee: EIDP Inc
•
Filing: 1988-10-07
•
Granted: 1990-02-20
•
Expires: 2008-10-07
Abstract
Abstract Electrically conductive tetrafluoroethylene copolymer compositions containing conductive carbon black have significant increased conductivity and lower effective melt viscosity when the tetrafluoroethylene copolymer has been treated with a fluorinating agent.
Inventors
- 👤 Robert J. Kolouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A composition consisting essentially of (a) a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR2## wherein R is R f , --R' f --X, or O--R f or --O--R' f --X in which R f is a perfluoroalkyl radical of 1-12 carbon atoms, R' f is --(CF 2 ) n --, were n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 70 per 10 6 carbon atoms; and (b) a conductive carbon black present in an amount of between 1 and 20 weight percent of the composition.
Claim 2
Dependent Claim
128 words
A composition consisting essentially of (a) a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR2## wherein R is R f , --R' f --X, or O--R f or --O--R' f --X in which R f is a perfluoroalkyl radical of 1-12 carbon atoms, R' f is --(CF 2 ) n --, were n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 70 per 10 6 carbon atoms; and (b) a conductive carbon black present in an amount of between 1 and 20 weight percent of the composition.
Claim 3
Dependent Claim
128 words
A composition consisting essentially of (a) a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR3## wherein R is R f , --R' f --X, or --O--R f or O--R' f --X in which R f is a perfluoroalkyl radical of 1-12 carbon atoms, R' f is --(CF 2 ) n --, where n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 6 per 10 6 carbon atoms; and (b) a conductive carbon black present in an amount of between 1 and 20 weight percent of the composition.
Claim 4
Dependent Claim
128 words
A composition consisting essentially of (a) a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR3## wherein R is R f , --R' f --X, or --O--R f or O--R' f --X in which R f is a perfluoroalkyl radical of 1-12 carbon atoms, R' f is --(CF 2 ) n --, where n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 6 per 10 6 carbon atoms; and (b) a conductive carbon black present in an amount of between 1 and 20 weight percent of the composition.
Claim 5
Dependent Claim
11 words
A composition according to claim 1 wherein the comonomer is hexafluoropropylene.
Claim 6
Dependent Claim
12 words
A composition of claim 1 wherein the comonomer is perfluoro(propyl vinyl ether).
Claim 7
Dependent Claim
17 words
A composition of claim 1 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro(alkyl vinyl ether).
Claim 8
Dependent Claim
24 words
A composition according to claim 1 wherein component (b) is present in an amount of between 1 and 6 weight percent of the composition.
Claim 9
Dependent Claim
24 words
A composition according to claim 2 wherein component (b) is present in an amount of between 1 and 6 weight percent of the composition.
Claim 10
Dependent Claim
13 words
A composition according to claim 1 wherein the fluorinating agent is fluorine gas.
Claim 11
Dependent Claim
13 words
A composition according to claim 2 wherein the fluorinating agent is fluorine gas.
Claim 12
Dependent Claim
18 words
A composition of claim 1 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro (propyl vinyl ether).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |