Conductive fine particles and anisotropic conductive material

Abstract

The invention provides conductive fine particles with a satisfactory monodisperse property, low cost, resistance to migration and excellent conductivity. Conductive fine particles having core particle surfaces coated with a metal-plated coating film layer containing nickel and phosphorus and a multilayer conductive layer comprising a palladium layer as the outer surface, wherein the phosphorus content in region A of the metal-plated coating film layer, at a distance of no greater than 20% of the thickness of the entire metal-plated coating film layer from the surface of the core particle, is 7-15 wt % of the entire region A, the phosphorus content in region B of the metal-plated coating film layer, at a distance of no greater than 10% of the thickness of the entire metal-plated coating film layer from the surface of the metal-plated coating film layer on the palladium layer side, is 0.1-3 wt % of the entire region B, and the phosphorus content of the entire metal-plated coating film layer is 7 wt % or greater.

Dependencies are inferred from the claim text.