US5264157A
Expired / Lapsed
US
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Material based on an electronic conductive polymer incorporating magnetic particles and its production process
Assignee: Solvay SA
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Filing: 1991-08-20
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Granted: 1993-11-23
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Expires: 2011-08-20
Abstract
Abstract The invention relates to an electricity conducting material having magnetic properties constituted by an electronic conductive polymer in which are homogeneously dispersed permanent magnetic particles bonded chemically or physicochemically to the polymer or serving as a polymer dopant. This material can be prepared by the polymerization a) of a monomer such as pyrrole in the presence of a colloidal suspension of charged magnetic particles, or b) a monomer such as pyrrole, chemically bonded to a magnetic particle.
Inventors
- 👤 Gerard Bidan
- 👤 Sylvie Chardon
- 👤 Etienne Hannecart
- 👤 Rene Massart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:53
CPC Classifications
B; B05; B05B; B05B17/00; B05B17/08; C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08G; C08G61/00; C08G61/12; C08G61/122; C08G61/123; C08G61/124; C08K3/20; C08K3/22; H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/127; H01F; H01F1/00; H01F1/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
106 words
Process for the preparation of an electricity conducting material including an electronic conductive polymer having homogeneously dispersed permanent magnetic oxide particles chemically or physicochemically bonded to the polymer, said particles acting as a dopant for said polymer, comprising the steps of providing a medium incorporating a colloidal suspension of magnetic oxide particles on which are fixed negatively charged organic groups and oxidatively polymerizing a precursor monomer of the electronically conductive polymer in said medium, said negatively charged organic groups being complexing agents having functional groups selected from the group consisting of --COO - , --SO 3 - , --OSO 3 - and --PO 4 2- .
Claim 2
Dependent Claim
106 words
Process for the preparation of an electricity conducting material including an electronic conductive polymer having homogeneously dispersed permanent magnetic oxide particles chemically or physicochemically bonded to the polymer, said particles acting as a dopant for said polymer, comprising the steps of providing a medium incorporating a colloidal suspension of magnetic oxide particles on which are fixed negatively charged organic groups and oxidatively polymerizing a precursor monomer of the electronically conductive polymer in said medium, said negatively charged organic groups being complexing agents having functional groups selected from the group consisting of --COO - , --SO 3 - , --OSO 3 - and --PO 4 2- .
Claim 3
Dependent Claim
95 words
Process for the preparation of an electricity conducting material including an electronic conductive polymer having homogeneously dispersed permanent magnetic particles chemically or physicochemically bonded to the polymer, said particles acting as a dopant for said polymer, comprising the steps of providing a medium incorporating a colloidal suspension of magnetic particles on which are fixed positively charged organic groups and oxidatively polymerizing a precursor monomer of the electronically conductive polymer in said medium, said positively charged organic groups being complexing agents having functional groups selected from the group consisting of quaternary phosphonium and quaternary ammonium ions.
Claim 4
Dependent Claim
95 words
Process for the preparation of an electricity conducting material including an electronic conductive polymer having homogeneously dispersed permanent magnetic particles chemically or physicochemically bonded to the polymer, said particles acting as a dopant for said polymer, comprising the steps of providing a medium incorporating a colloidal suspension of magnetic particles on which are fixed positively charged organic groups and oxidatively polymerizing a precursor monomer of the electronically conductive polymer in said medium, said positively charged organic groups being complexing agents having functional groups selected from the group consisting of quaternary phosphonium and quaternary ammonium ions.
Claim 5
Dependent Claim
24 words
Process according to claim 1, characterized in that polymerization takes place by electrochemical oxidation using as the electrolyte the colloidal suspension of magnetic particles.
Claim 6
Dependent Claim
20 words
Process according to either of the claims 1 or 2, characterized in that polymerization is carried out by chemical oxidation.
Claim 7
Dependent Claim
36 words
Process according to claim 4, characterized in that the medium also comprises additives making it possible to form a polymer latex, wherein said additives are such as to avoid coagulation of the polymer in powder form.
Claim 8
Dependent Claim
60 words
Process according to claim 3, wherein another electrolyte is added to the polymerization medium so that there is a competition between the magnetic particles and the ions of the added electrolyte for positively charged sites of the polymer, and wherein the quantity of magnetic particles dispersed in the polymer is controlled by selecting the quantity of electrolyte which is added.
Claim 9
Dependent Claim
23 words
Process according to claim 1, characterized in that the complexing agent is chosen from among citric acid and the compounds of formulas: ##STR13##
Claim 10
Dependent Claim
16 words
An electricity conducting material produced according to the process of either of claims 1 or 2.
Claim 11
Dependent Claim
12 words
An electricity conducting material produced according to the process of claim 3.
Claim 12
Dependent Claim
12 words
An electricity conducting material produced according to the process of claim 4.
Claim 13
Dependent Claim
12 words
An electricity conducting material produced according to the process of claim 5.
Claim 14
Dependent Claim
12 words
An electricity conducting material produced according to the process of claim 6.
Claim 15
Dependent Claim
12 words
An electricity conducting material produced according to the process of claim 7.
Claim 16
Dependent Claim
25 words
A process according to claim 2 characterized in that polymerization takes place by electrochemical oxidation using as the electrolyte the colloidal suspension of magnetic particles.
Claim 17
Dependent Claim
59 words
Process according claim 14 wherein another electrolyte is added to the polymerization medium so that there is a competition between the magnetic particles and the ions of the added electrolyte for negatively charged sites of the polymer, and wherein the quantity of magnetic particles dispersed in the polymer is controlled by selecting the quantity of electrolyte which is added.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |