US4697000A
Expired / Lapsed
US
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Process for producing polypyrrole powder and the material so produced
Assignee: Boeing North American Inc
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Filing: 1986-07-08
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Granted: 1987-09-29
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Expires: 2006-07-08
Abstract
Abstract Production of electrically conductive polypyrrole powder, by treating a liquid pyrrole with a solution of a strong oxidant, capable of oxidizing pyrrole to a pyrrole polymer, and oxidizing the pyrrole by such strong oxidant in the presence of a substantially non-nucleophilic anion and precipitating a conductive polypyrrole powder. The strong oxidant, e.g., Fe 3+ ion, and non-nucleophilic anion, e.g., sulfate or chloride ion, can be derived from a single compound, e.g., FeCl 3 or Fe 2 (SO 4 ) 3 . The anion serves as dopant for the polypyrrole. The reaction can be carried out in aqueous solution or in an organic solvent medium, such as acetonitrile.
Inventors
- 👤 Edward F. Witucki
- 👤 Leslie F. Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/14; H01B1/06; H01B1/12; H01B1/124; H01B1/127; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/188; H05K1/00; H05K1/02; H05K1/09
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
88 words
A process for producing electrically conductive polypyrrole powder which comprises: treating a liquid pyrrole with a solution of a strong oxidant capable of oxidizing pyrrole to a pyrrole polymer, said strong oxidant being a cation selected from the group consisting of Fe 3+ , Cu 2+ , Ce 4+ , NO + , NO 2 + and (C 6 H 5 ) 3 C + cations, and oxidizing said pyrrole by said strong oxidant in the presence of a substantially non-nucleophilic anion, and precipitating a conductive polypyrrole powder.
Claim 2
Dependent Claim
88 words
A process for producing electrically conductive polypyrrole powder which comprises: treating a liquid pyrrole with a solution of a strong oxidant capable of oxidizing pyrrole to a pyrrole polymer, said strong oxidant being a cation selected from the group consisting of Fe 3+ , Cu 2+ , Ce 4+ , NO + , NO 2 + and (C 6 H 5 ) 3 C + cations, and oxidizing said pyrrole by said strong oxidant in the presence of a substantially non-nucleophilic anion, and precipitating a conductive polypyrrole powder.
Claim 3
Dependent Claim
28 words
The process of claim 1, said pyrrole monomer selected from the group consisting of pyrrole, a 3- and 3,4-alkyl and aryl C-substituted pyrrole, an N-alkylpyrrole and an N-arylpyrrole.
Claim 4
Dependent Claim
41 words
The process of claim 1, said oxidant being present in a concentration in the range of about 0.001 to about 2 molar, and said non-nucleophilic anion being present in a concentration in the range from about 0.001 to about 2 molar.
Claim 5
Dependent Claim
33 words
The process of claim 1, said non-nucleophilic anion being selected from the group consisting of sulfate, bisulfate, perchlorate, chloride, fluoborate, PF 6 - , AsF 6 - , and SbF 6 - anions.
Claim 6
Dependent Claim
21 words
The process of claim 4, said non-nucleophilic anion being derived from the free acids or the soluble salts of said acids.
Claim 7
Dependent Claim
35 words
The process of claim 1, said oxidant and said non-nucleophilic anion being provided by a compound selected from the group consisting of ferric perchlorate, ferric chloride, ceric sulfate, cupric fluoborate, cupric perchlorate, and nitrosyl hexafluorophosphate.
Claim 8
Dependent Claim
34 words
The process of claim 1, the reaction being carried out in aqueous or organic solvent medium in which said pyrrole and said oxidant are soluble and which does not interfere with the oxidation reaction.
Claim 9
Dependent Claim
126 words
A process for producing electrically conductive polypyrrole powder which comprises: contacting a pyrrole and a strong oxidant capable of oxidizing pyrrole to a pyrrole polymer, at substantially room temperature, in an aqueous or organic solvent medium in which said pyrrole and said oxidant are soluble and which does not interfere with the oxidation reaction, said strong oxidant being a cation selected from the group consisting of Fe 3+ , Cu 2+ , Ce 4+ , NO + , NO 2 + and (C 6 H 5 ) 3 C + , cations, and oxidizing said pyrrole by said strong oxidant in the presence of a substantially non-nucleophilic anion, and precipitating a conductive polypyrrole powder comprising a pyrrole polymer cation and a substantially non-nucleophilic anion as dopant.
Claim 10
Dependent Claim
126 words
A process for producing electrically conductive polypyrrole powder which comprises: contacting a pyrrole and a strong oxidant capable of oxidizing pyrrole to a pyrrole polymer, at substantially room temperature, in an aqueous or organic solvent medium in which said pyrrole and said oxidant are soluble and which does not interfere with the oxidation reaction, said strong oxidant being a cation selected from the group consisting of Fe 3+ , Cu 2+ , Ce 4+ , NO + , NO 2 + and (C 6 H 5 ) 3 C + , cations, and oxidizing said pyrrole by said strong oxidant in the presence of a substantially non-nucleophilic anion, and precipitating a conductive polypyrrole powder comprising a pyrrole polymer cation and a substantially non-nucleophilic anion as dopant.
Claim 11
Dependent Claim
26 words
The process of claim 8, said pyrrole being liquid pyrrole, and said strong oxidant and said non-nucleophilic anion being provided by ferric chloride or ferric sulfate.
Claim 12
Dependent Claim
23 words
The process of claim 8, said pyrrole being liquid pyrrole, and said strong oxidant and said non-nucleophilic anion being provided by ceric sulfate.
Claim 13
Dependent Claim
12 words
An electrically conductive polypyrrole powder produced by the process of claim 1.
Claim 14
Dependent Claim
12 words
An electrically conductive polypyrrole powder produced by the process of claim 2.
Claim 15
Dependent Claim
12 words
An electrically conductive polypyrrole powder produced by the process of claim 4.
Claim 16
Dependent Claim
12 words
An electrically conductive polypyrrole powder produced by the process of claim 8.
Claim 17
Dependent Claim
12 words
An electrically conductive polypyrrole powder produced by the process of claim 9.
References Cited (Backward Citations)
US4568483A
Cited
US4567250A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
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