Patent ID: 6875252

Claim:
A copper powder prepared by a wet reduction process, said copper powder comprising particles having an average particle diameter in the range of from not less than 0.1 μm to less than 1.5 μm, the powder having an oxygen content of 0.17% or less and having a narrow particle size distribution width whose value A, defined by equation below in terms of X25, X50 and X75 defined below is not greater than 1.2, and forms a pseudo-fused sintered product when held at a temperature of 800° C. under an atmosphere of inert gas at one atmosphere pressure: A =( X 75 −X 25)/ X 50 where X25, X50 and X75 are values of particle-size curve plotted in an orthogonal coordinate system whose abscissa represents particle diameter X (μm) and ordinate represents Q % (ratio of particles of a diameter not greater than the corresponding value of X; expressed in units of vol % of particles).