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Patent US4160760A successfully refreshed from Google Patents.
US4160760A
Expired / Lapsed
US
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Process for preparing polyacrylonitrile doped with Prussion blue
Assignee: Northwestern University
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Filing: 1977-08-22
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Granted: 1979-07-10
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Expires: 1997-08-22
Abstract
Abstract A method for interacting Prussian blue with polyacrylonitrile in the presence of dimethylformamide to produce a polymer solid exhibiting a high degree of color fastness, levelness, and stability and having enhanced and highly useful electrical properties.
Inventors
- 👤 Stephen H. Carr
- 👤 Samuel I. Stupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:41
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; C08J2333/00; C08J2333/18; C08J2333/20; Y; Y10; Y10S; Y10S260/00; Y10S260/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
A method for reacting color agents selected from the group consisting of hydrated metal cyanide complexes, and iodine with polyacrylonitrile homopolymers and copolymers to provide a polymer solid exhibiting enhanced electrical properties and color characteristics, said method comprising the steps of: a. preparing a polymer solution of acrylonitrile polymer in a solvent selected from the group consisting of dimethyl formamide and dimethyl sulfoxide at a concentration below 20 weight-percent polymer, b. preparing an aqueous dispersion of an additive selected from the group consisting of hydrated metal cyanide complexes, iodine and mixtures thereof at a concentration below 0.1 Molar, c. agitating said polymer solution while slowly adding thereto said aqueous dispersion to provide a substantially homogeneous fluid system, d. evaporating said fluid system to remove said solvent and water therefrom, to provide a homogeneous, colored solid comprising an acrylonitrile polymer containing the additive distributed therethrough as an essentially molecularly dispersed phase.
Claim 2
Independent Claim
150 words
A method for reacting color agents selected from the group consisting of hydrated metal cyanide complexes, and iodine with polyacrylonitrile homopolymers and copolymers to provide a polymer solid exhibiting enhanced electrical properties and color characteristics, said method comprising the steps of: a. preparing a polymer solution of acrylonitrile polymer in a solvent selected from the group consisting of dimethyl formamide and dimethyl sulfoxide at a concentration below 20 weight-percent polymer, b. preparing an aqueous dispersion of an additive selected from the group consisting of hydrated metal cyanide complexes, iodine and mixtures thereof at a concentration below 0.1 Molar, c. agitating said polymer solution while slowly adding thereto said aqueous dispersion to provide a substantially homogeneous fluid system, d. evaporating said fluid system to remove said solvent and water therefrom, to provide a homogeneous, colored solid comprising an acrylonitrile polymer containing the additive distributed therethrough as an essentially molecularly dispersed phase.
Claim 3
Dependent Claim
34 words
The method as set forth in claim 1 wherein said solution of acrylonitrile polymer is in dimethyl formamide and contains polyacrylonitrile at a concentration in the range of up to 3 percent by weight.
Claim 4
Dependent Claim
28 words
The method as set forth in claim 1 wherein said additive is an aqueous dispersion of Prussian blue containing Prussian blue in a concentration of about 0.02 Molar.
Claim 5
Dependent Claim
33 words
The method as set forth in claim 1 wherein said evaporating of said fluid system is conducted under pressures at or below normal atmospheric pressure and at temperatures near or above room temperature.
Claim 6
Dependent Claim
25 words
The method as set forth in claim 1 and further comprising the step of forming said solid into a film characterized by enhanced electrical properties.
Claim 7
Dependent Claim
27 words
The method as set forth in claim 1 and further comprising the step of forming said solid into a fiber exhibiting enhanced electrical conductivity and dying characteristics.
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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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |