US4569734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polypyrroles, and films obtained by this method
Assignee: BASF SE
•
Filing: 1984-05-23
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Granted: 1986-02-11
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Expires: 2004-05-23
Abstract
Abstract Polypyrroles are prepared by electrochemical polymerization, in particular anodic oxidation, of pyrrole alone or together with comonomers, in an aqueous electrolyte solvent which consists of not less than 50% by weight of water, in the presence of aromatic sulfonic acids and/or their salts as conductive salts. The process gives polypyrrole films which have good mechanical properties and high electrical conductivities.
Inventors
- 👤 Herbert Naarmann
- 👤 Johann Nickl
- 👤 Gernot Kohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:06
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/60; C; C08; C08F; C08F34/00; C08G; C08G61/00; C08G61/12; C08G61/122; C08G61/123; C08G61/124; C09; C09D; C09D5/00; C09D5/44; C09D5/4476; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; H10; H10K; H10K85/00; H10K85/10; H10K85/111; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A process for the preparation of a polypyrrole film having a homogeneous surface and having an electrical conductivity above 10 2 Ω -1 cm -1 by anodic oxidation of pyrrole or a mixture of pyrrole with comonomers in a water-containing electrolyte solvent in the presence of a conductive salt, with deposition of the polypyrrole on the anode, wherein the electrochemical anodic oxidation is carried out in an aqueous electrolyte solvent which consists of not less than 50% by weight of water, aromatic sulfonic acids and/or their salts being used as conductive salts.
Claim 2
Dependent Claim
92 words
A process for the preparation of a polypyrrole film having a homogeneous surface and having an electrical conductivity above 10 2 Ω -1 cm -1 by anodic oxidation of pyrrole or a mixture of pyrrole with comonomers in a water-containing electrolyte solvent in the presence of a conductive salt, with deposition of the polypyrrole on the anode, wherein the electrochemical anodic oxidation is carried out in an aqueous electrolyte solvent which consists of not less than 50% by weight of water, aromatic sulfonic acids and/or their salts being used as conductive salts.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1, wherein the electrolyte solvent consists of not less than 80% by weight of water.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the conductive salt used is an alkali metal salt of an aromatic sulfonic acid.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1, wherein the conductive salt used is a nitrogen or phosphorus onium salt of an aromatic sulfonic acid.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 1, wherein the aromatic sulfonic acid is benzene, a fused aromatic ring system or a polynuclear quinone having one or more sulfonic acid groups in the molecule.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein the aromatic sulfonic acid carries one or more further substituents.
Claim 8
Dependent Claim
40 words
A process as claimed in claim 1, wherein the aromatic sulfonic acid used is polystyrenesulfonic acid having a mean molecular weight of from 500 to 20,000 and containing from 1 to about 35 sulfonic acid groups per 100 styrene units.
Claim 9
Dependent Claim
44 words
A process as claimed in claim 1, wherein, in addition to the aromatic sulfonic acids and/or their salts, other conventional conductive salts are concomitantly used in an amount of not more than 50% by weight, based on the total amount of conductive salts employed.
Claim 10
Dependent Claim
29 words
A process as claimed in claim 1, wherein a pyrrole/comonomer mixture is employed which contains as much as 25% by weight, based on the total monomer mixture, of comonomers.
References Cited (Backward Citations)
US3574072A
Cited
US4401545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |