Patent ID: 6375821
Filing Date: 2002-04-23
Classification: C09D

Abstract:
A process for forming a coating on conductive particles, said process comprising the steps of: grafting at least one material selected from a group consisting of a polymer and a copolymer onto these particles by using a bath containing at least one monomer from which the polymer and copolymer are formed; carrying out this grafting by electrochemical reduction of the said monomer in an electrolysis bath containing an aprotic solvent, an electrolyte support, and the monomer required to form the coating, said electrolysis bath also containing at least one cathode and one anode, putting the particles into suspension in the bath and making them move therein responsive to a current in said electrolysis bath, said movement creating intermittent contact between said particles and the cathode, and coating by polymerization on the particles being formed by applying a potential which drives an electrodialysis reaction into a passivation region corresponding to an inhibition peak detected by voltammetry, the cathode remaining insensitive to the polymerization during the application of the potential.