Process for coating fine particles with conductive polymers

Details Process for coating fine particles with conductive polymers Process for coating fine particles with conductive polymers

H - Electricity

01

B

H01B 1/12 (2006.01) B05D 5/12 (2006.01) B05D 7/24 (2006.01) C09D 5/24 (2006.01) C23C 22/00 (2006.01)

Patent

CA 2575927

A process is disclosed for coating fine particles, in which the feed mixture contains: at least one monomer and/or at least one oligomer selected from monomers and/or oligomers of aromatic compounds and/or unsaturated hydrocarbon compounds suitable for forming an electroconductive oligomer, polymer, copolymer, block copolymer or graft copolymer; at least one type of anions which (1) are and/or can be incorporated as doping ions into the structure of the conductive polymer; (2) can be discharged from said structure in the event of a potential fall of the conductive polymer (reduction); and (3) can have an anti-corrosive effect in the presence of a metallic surface; at least one type of particles; if necessary, at least one oxidising agent and water and/or at least another solvent. A coating is formed from the feed mixture on the particle surface, the feed mixture being converted by oxidation into a conductive polymer in the presence of at least one type of mobile anti- corrosive anions. Alternatively, the fine particles are coated with a product mixture that contains a conductive polymer.

L'invention concerne un procédé de revêtement de fines particules à partir d'un mélange d'alimentation qui contient: au moins un monomère et/ou au moins un oligomère sélectionné parmi les monomères et/ou oligomères de composés aromatiques et/ou de composés hydrocarbures insaturés susceptibles de former des oligomères, polymères, copolymères, copolymères blocs ou copolymères greffés électroconducteurs; au moins un type d'anions qui (1) sont ou peuvent être incorporés en tant qu'ions dopants dans la structure du polymère conducteur, (2) peuvent se libérer à nouveau lors d'une chute de potentiel du polymère conducteur (réduction); et (3) peuvent avoir un effet de protection contre la corrosion en présence d'une surface métallique; au moins un type de particules; le cas échéant, au moins un agent oxydant et de l'eau et/ou au moins un autre solvant. Un revêtement est formé sur la surface des particules à partir du mélange d'alimentation, qui se transforme par oxydation en un polymère conducteur en présence d'au moins un type d'anions mobiles de protection contre la corrosion. Alternativement, les fines particules sont revêtues d'un mélange de produits qui contient un polymère conducteur.

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