EP0403180A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coated particulate metallic materials
Assignee: Vesuvius Holdings Ltd
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Filing: 1990-06-08
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Granted: —
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Expires: 2010-06-08
Abstract
Abstract A powdery or granular metallic material which is coated with a coating of an inherently conductive polymeric material. Suitable conductive polymeric materials include polypyrrole, substituted polypyrrole, polyaniline and substituted polyanilines. The coated powdery or granular metallic material may be used as an EMI and/or RFI shielding material.
Inventors
- 👤 Poopathy Kathirgamanathan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:49
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; B; B22; B22F; B22F1/00; B22F1/10; C; C08; C08K; C08K9/00; C08K9/10; C09; C09C; C09C1/00; C09C1/62; C09D; C09D11/00; C09D11/52; H01; H01B; H01B1/00; H01B1/02; H01B1/06; H01B1/12; H01B1/124; H01B1/127; H01B1/128; H01B1/20; H01B1/22; C01; C01P; C01P2004/00; C01P2004/10; C01P2004/20; C01P2004/50; C01P2004/54; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/11; C01P2006/12; C01P2006/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
18 words
A powdery or granular metallic material which is coated with a coating of an inherently conductive polymeric material.
Claim 2
Dependent Claim
18 words
A powdery or granular metallic material which is coated with a coating of an inherently conductive polymeric material.
Claim 3
Dependent Claim
47 words
A powdery or granular metallic material as claimed in claim 1 wherein the conductive polymeric material is a polypyrrole, a substituted polypyrrole, a polythiophene, a substituted polythiophene, a polyaniline, a substituted polyaniline, a polyethylene oxide, an aniline copolymer, a polyphthalocyanine, a polyphenylene, a poly(isothianaphthene) or a polyphenylvinylene.
Claim 4
Dependent Claim
43 words
A powdery or granular metallic material as claimed in claim 1 or claim 2 wherein the metallic material is iron, aluminium, copper, nickel, silver, gold, platinum, beryllium, cadmium, tin, lead, chromium, zinc, tungsten, stainless steel, brass, a cobalt/chromium alloy or a nickel/iron alloy.
Claim 5
Dependent Claim
40 words
A powdery or granular metallic material as claimed in any one of the preceding claims which has an average diameter or average length in the range of from 0.1 to 500 micrometres, prior to coating with the conductive polymeric material.
Claim 6
Dependent Claim
34 words
A powdery or granular metallic material as claimed in any one of the preceding claims which is coated with a combination of coatings, at least one of which is an inherently conductive polymeric material.
Claim 7
Independent Claim
64 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium having the powdery or granular metallic material suspended therein to electrochemical oxidation at an electrode potential which is at least as electropositive as the oxidation potential of the monomer.
Claim 8
Independent Claim
64 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium having the powdery or granular metallic material suspended therein to electrochemical oxidation at an electrode potential which is at least as electropositive as the oxidation potential of the monomer.
Claim 9
Dependent Claim
69 words
A method as claimed in claim 6 wherein the aqueous or non-aqueous medium includes an electrolyte to provide the conductive polymer with counterions in its structure which are chloride, bromide, sulphate, bisulphate, nitrate, tetrafluoroborate, alkylsulphonate, arylsulphonate, arenecarboxylate, alkylcarboxylate, arenedicarboxylate, polystyrenesulphonate, polyacrylate, cellulose sulphonate, cellulose sulphate, anthracenesulphonate, H₂PO - 3 , H₂PO - 3 , PF - 6 , SbF - 6 , AsF - 6 ions or perfluorinated polyanions.
Claim 10
Dependent Claim
32 words
A method as claimed in to claim 6 or claim 7 wherein the non-aqueous medium is acetonitrile, dichloromethane, chloroform, nitromethane, nitrobenzene, propylene carbonate, dichloroethane, N-methylpyrrolidone, sulpholane, dimethylformamide, dimethylsulphoxide or a mixture thereof.
Claim 11
Independent Claim
64 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium to oxidation using an oxidant which has a higher oxidation potential than the monomer in the presence of an acid HX, or a salt-thereof to provide the counterions X⁻.
Claim 12
Independent Claim
64 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium to oxidation using an oxidant which has a higher oxidation potential than the monomer in the presence of an acid HX, or a salt-thereof to provide the counterions X⁻.
Claim 13
Independent Claim
72 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium to oxidation using an oxidant which has a higher oxidation potential than the monomer with the sequential addition of an acid HX or a salt thereof to the oxidised monomer in order to provide the counterions X⁻.
Claim 14
Independent Claim
72 words
A method for the preparation of a powdery or granular metallic material with a coating of an inherently conductive polymeric material thereon, which method comprises subjecting an appropriate monomer in an aqueous or non-aqueous medium to oxidation using an oxidant which has a higher oxidation potential than the monomer with the sequential addition of an acid HX or a salt thereof to the oxidised monomer in order to provide the counterions X⁻.
Claim 15
Dependent Claim
19 words
A method as claimed in claim 9 or claim 10 wherein the oxidant is potassium dichromate or ammonium persulphate.
Claim 16
Dependent Claim
29 words
A method as claimed in claim 9 or claim 10 wherein the monomer is aniline or a substituted aniline and the polymerization reaction is carried out in aqueous medium.
Claim 17
Dependent Claim
27 words
The use of a coated powdery or granular metallic material as claimed in any one of claims 1 to 5 as an EMI and/or RFI shielding material.
Claim 18
Dependent Claim
24 words
The use of a coated powdery or granular metallic material as claimed in any one of claims 1 to 5 in electrically conductive/magnetic inks.
References Cited (Backward Citations)
No citation records indexed.
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