▎ 摘　　要

NOVELTY - Electroconductive particle comprising a polymer microparticle (A), and a graphene coating layer (C) grafted on the polymer microparticle, is claimed. USE - (I) is useful in an anisotropic conductive film (claimed), which is used for packaging electronic devices. ADVANTAGE - (I) has improved long-term stability of the conductivity, surface conductivity, durability, and thermal resistance. (I) can be prepared in various sizes and forms by a simple and inexpensive process. (I) has strong bonding strength between the polymer microparticle and the graphene through forming covalent or ionic bonds, thus are able to prevent from generating cracks and exfoliation on the graphene coating layer and have improved durability. The bonding strength is stable even at a high temperature, the electroconductive particle can maintain a high electroconductivity at a high temperature process (100 degrees C or more.) for preparing a semiconductor device or an electronic printed circuit board. DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the electroconductive particle. Polymer microparticle (A) Chemical bonding layer (B) Graphene coating layer. (C)