NOVELTY - A layered particle comprises a thermoplastic or crosslinked, non-halogenated polymeric core containing anionic functional groups on its surface, and an oxidatively polymerized shell. The particle is easily redispersible in a polar solvent.    USE - A layered particle for use as conductor material, conductor-precursor, electrophoretic (dye) particles, pigments, infra-red absorbers, especially in charge injection layers, planarizing layers, antistatics, conductive substrates or patterns, photoconductors, electrophotographic applications, recording materials for preparing a conductive or semiconductive layer for an electronic device, conductive structures, conductive inks, capacitors, light managing systems, or optical or acoustical filter. The electronic device is integrated circuits, displays, radio frequency identification tags, electro or photoluminescent devices, backlights of a display, photovoltaic or sensor devices, or solar cells. (all claimed)    ADVANTAGE - The particle has good mechanical, optical, chemical/processing, interface, general application and electrical properties; is easily redispersible in a polar solvent; has high optical transparency due to delusion effect of the core polymer, high adhesion of the film to the substrates because of the absence of surfactants, and good film formation because of low roughness due to plasticity of the particle core; and makes film cheap due to the incorporation of the core polymer.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a process of preparing a layered particle comprising polymerization of a monomer in the presence of a polar solvent and intermediate particles dispersed in the solvent by addition of an oxidizing agent where the intermediate particles comprise a thermoplastic or crosslinked polymeric core containing anionic functional groups covalently bonded to its surface;    (2) a process of preparing a conductive or semiconductive layer comprising heating a layer comprising particles to a temperature above the glass transition temperature of the synthetic organic polymer of the core particle; and    (3) an electronic device, or optical or acoustical filter comprising particles and/or a conductive or semiconductive layer.