METHOD FOR ESTIMATING MAGNETIC FLUX DENSITY OF MAGNETIC CONDUCTIVE PARTICLE AND METHOD FOR DETERMINING QUALITY OF MAGNETIZATION STATE OF MAGNETIC CONDUCTIVE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method for simply and accurately estimating a magnetic flux density of magnetic conductive particles at least a part of which is composed of magnetic materials, and a method for simply and accurately determining quality of the magnetization state of the magnetic conductive particles to be used for an anisotropic conductive film.SOLUTION: The method for estimating magnetic flux density of the magnetic conductive particles includes: dispersing a plurality of magnetic conductive particles each having different magnetic flux densities in organic solvents respectively; measuring initial light transmittance T(%) of the plurality of obtained dispersion liquid immediately after dispersion; measuring light transmittance T(%) of supernatant liquid of the dispersion liquid left to stand still for n hours after the dispersion; calculating light transmittance difference &Dgr;T(%) by subtracting Tfrom T; and acquiring a primary regression equation from the plurality of light transmittance differences &Dgr;T(%) thus calculated and logarithms of the plurality of magnetic flux densities corresponding to the light transmittance differences. A magnetic flux density obtained by applying, to the regression equation, the obtained light transmittance difference &Dgr;T(%) of the magnetic conductive particle of which the magnetic flux density is unknown, is estimated to be the magnetic flux density of the magnetic conductive particle.