US4607083A
Expired / Lapsed
US
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Long-term stability of the electrical conductivity of pyrrol polymers
Assignee: BASF SE
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Filing: 1984-12-20
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Granted: 1986-08-19
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Expires: 2004-12-20
Abstract
Abstract The long-term stability of the electrical conductivity of pyrrole polymers is improved by a process in which the polymers are treated with an aqueous alkali metal hydroxide solution. Pyrrole polymers treated in this manner are used as electrical conductor elements or resistive films.
Inventors
- 👤 Helmut Muenstedt
- 👤 Herbert Naarmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:19
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A process for improving long-term stability of the electrical conductivity of a pyrrole polymer containing a complexing agent which comprises: contacting said pyrrole polymer containing a complexing agent with an aqueous alkali metal hydroxide solution.
Claim 2
Dependent Claim
35 words
A process for improving long-term stability of the electrical conductivity of a pyrrole polymer containing a complexing agent which comprises: contacting said pyrrole polymer containing a complexing agent with an aqueous alkali metal hydroxide solution.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the aqueous alkali metal hydroxide solution has a pH greater than 12.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein a 0.2 to 25% strength alkali metal hydroxide solution is used in the process.
Claim 5
Dependent Claim
18 words
The process of claim 1, wherein the aqueous alkali metal hydroxide solution has a pH greater than 10.
Claim 6
Dependent Claim
15 words
The process of claim 1, wherein a 0.1-50% strength alkali metal hydroxide solution is used.
Claim 7
Dependent Claim
15 words
The process of claim 1, wherein the polymer is subsequently treated with a strong acid.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |