US6001281A
Expired / Lapsed
US
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Preparation of conductive polymers from stabilized precursor solutions
Assignee: Kemet Electronics Corp
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Filing: 1998-09-04
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Granted: 1999-12-14
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Expires: 2018-09-04
Abstract
Abstract Conductive polymers are prepared from a stabilized solution containing a monomer, an Fe(III) oxidizing agent, and a mixed solvent. The solvents are selected to stabilize the Fe(III) oxidizing agent and monomer in solution while allowing highly conducting polymers to be produced upon evaporating the lower-boiling solvent. The higher-boiling solvent does not appreciably complex with Fe(III), while the lower-boiling solvent forms a weak complex with Fe(III). The mixed-solvent system of the present invention may be used for preparing a conductive polymer counter electrode in a solid tantalum capacitor by polymerizing the monomer inside a porous tantalum pellet.
Inventors
- 👤 Philip M. Lessner
- 👤 Tsung-Yuan Su
- 👤 Randolph S. Hahn
- 👤 Veeriya Rajasekaran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:29
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/127; H01G; H01G11/00; H01G11/22; H01G11/30; H01G11/48; H01G11/54; H01G11/56; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A stabilized precursor solution for preparing conductive polymers, the solution comprising: (a) a monomer; (b) an Fe(III) oxidizing agent; (c) a first solvent having a first boiling point, wherein the first solvent does not appreciably complex with Fe(III); and (d) a second solvent having a second boiling point, wherein the second solvent forms a weak complex with Fe(III); wherein the first boiling point is higher than the second boiling point.
Claim 2
Dependent Claim
70 words
A stabilized precursor solution for preparing conductive polymers, the solution comprising: (a) a monomer; (b) an Fe(III) oxidizing agent; (c) a first solvent having a first boiling point, wherein the first solvent does not appreciably complex with Fe(III); and (d) a second solvent having a second boiling point, wherein the second solvent forms a weak complex with Fe(III); wherein the first boiling point is higher than the second boiling point.
Claim 3
Dependent Claim
22 words
The stabilized precursor solution of claim 1 wherein the first solvent is selected from the group consisting of lower alcohols and ketones.
Claim 4
Dependent Claim
13 words
The stabilized precursor solution of claim 2 wherein the first solvent is 1-butanol.
Claim 5
Dependent Claim
22 words
The stabilized precursor solution of claim 1 wherein the second solvent is selected from the group consisting of cyclic ethers and dioxanes.
Claim 6
Dependent Claim
13 words
The stabilized precursor solution of claim 4 wherein the second solvent is tetrahydrofuran.
Claim 7
Dependent Claim
22 words
The stabilized precursor solution of claim 1 wherein the monomer is selected from the group consisting of pyrrole, thiophene and derivatives thereof.
Claim 8
Dependent Claim
12 words
The stabilized precursor solution of claim 6 wherein the monomer is 3,4-ethylenedioxythiophene.
Claim 9
Dependent Claim
14 words
The stabilized precursor solution of claim 1 wherein the oxidizing agent is Fe(III) tosylate.
Claim 10
Dependent Claim
25 words
The stabilized precursor solution of claim 1 wherein the monomer is present in an amount of from about 0.5 to about 12 percent by weight.
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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) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |