INSULATED ULTRAFINE POWDER, PREPARATION METHOD THEREOF, RESIN COMPOSITE MATERIAL CONTAINING THE POWDER, HIGH DIELECTRIC CONSTANT FILM OR SHEET AND ELECTRONIC PART TO IMPROVE DIELECTRIC CONSTANT OF RESIN COMPOSITE FILM WITH INHIBITING ADDITION AMOUNT OF FILLER FOR MAINTAINING PROCESSABILITY AND FORMABILITY OF RESIN MATERIAL ITSELF BY ADDING SMALL AMOUNT OF INSULATED ULTRAFINE POWDER

摘要

PURPOSE: An insulated ultrafine powder, its preparation method, a resin composite material containing the powder, a high dielectric constant film or sheet containing the resin composite material and an electronic part containing the film or sheet are provided, to obtain a resin composite material having high dielectric constant without the deterioration of processability and formability of a resin material itself. CONSTITUTION: The insulated ultrafine powder is obtained by forming an insulating coat on a spherical, spheroidal or acicular conductive ultrafine powder having a minor axis of 1-100 nm. Preferably the insulating coat comprises at least one selected from the group consisting of insulating oxides and insulating nitrides; and the conductive ultrafine powder comprises a metal oxide. The resin composite material comprises the insulated ultrafine powder and at least one kind of polymer in the ratio of 5:95 to 50:50 by volume, and has a relative permittivity of 20 or more.