Patent US5000875A successfully refreshed from Google Patents.
US5000875A
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US
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Conductive filled fluoropolymers
Assignee: EIDP Inc
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Filing: 1990-02-02
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Granted: 1991-03-19
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Expires: 2010-02-02
Abstract
Abstract Tetrafluoroethylene copolymer compositions containing conductive carbon black, graphite fiber or thermally conductive fillers have significantly increased conductivity 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
2026-10-24 14:18
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/02; C08K3/04; C08K7/00; C08K7/02; C08K7/04; C08K7/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
A composition consisting essentially of (a) 50-75 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR2## wherein R 1 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 70 per 10 6 carbon atoms; and (b) graphite fibers.
Claim 2
Dependent Claim
117 words
A composition consisting essentially of (a) 50-75 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR2## wherein R 1 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 70 per 10 6 carbon atoms; and (b) graphite fibers.
Claim 3
Dependent Claim
118 words
A composition consisting essentially of (a) 50-90 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR3## wherein R 1 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 70 per 10 6 carbon atoms; and (b) a thermoconductive filler.
Claim 4
Dependent Claim
118 words
A composition consisting essentially of (a) 50-90 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR3## wherein R 1 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 70 per 10 6 carbon atoms; and (b) a thermoconductive filler.
Claim 5
Dependent Claim
13 words
The composition according to claim 1 or 2 wherein the comonomer is hexafluoropropylene.
Claim 6
Dependent Claim
14 words
The composition of claim 1 or 2 wherein the comonomer is perfluoro(propyl vinyl ether).
Claim 7
Dependent Claim
19 words
The composition of claim 1 or 2 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro(alkyl vinyl ether).
Claim 8
Dependent Claim
15 words
The composition according to claim 1 or 2 wherein the fluorinating agent is fluorine gas.
Claim 9
Dependent Claim
20 words
The composition of claim 1 or 2 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro (propyl vinyl ether).
Claim 10
Dependent Claim
18 words
The composition of claim 1 wherein the graphite fiber has an average length of at least 2 mm.
Claim 11
Dependent Claim
17 words
The composition of claim 1 wherein the graphite fiber has a length/diameter ratio of at least 100.
Claim 12
Dependent Claim
16 words
The composition of claim 1 or 2 wherein the amount of copolymer is 50-90% by weight.
Claim 13
Dependent Claim
27 words
The composition of claim 2 wherein the thermoconductive filler is selected from the group consisting of iron oxide, zinc oxide, aluminum oxide, magnesium oxide and silicon carbide.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |