hours thereby yielding a slurry 3 a binder solution composed of 10 parts by weight of an acrylic resin as a binder 1 4 parts by weight of dioctyl phthalate as a plasticizer and a solvent comprised of 35 parts by weight of toluene and 35 parts by weight of ethyl alcohol was prepared beforehand by stirring and dissolving the binder solution was then added to the mixed and pulverized slurry described above 4 subsequently the slurry containing the binder solution was mixed and pulverized by a ball mill for 5 hours thereby yielding a finished dispersed slurry for forming ceramic green sheets the dispersibility of the ceramic slurry composition thus formed was measured using a measurement apparatus of particle size distribution made by microtrack the d90 was 0 50 u03bcm the ceramic slurry composition was dehydrated and was heated to 500 u00b0 c to remove the binder and the specific surface area thereof was measured the rate of increase in the specific surface area from the original specific surface area was 12 the ceramic slurry composition was formed into sheets by a doctor blade method thereby yielding ceramic green sheets the surface roughness ra of the ceramic green sheet thus formed was measured by an atomic force microscope and as the ratio of density of the ceramic green sheet the ratio of the measured density to the theoretical density the measured density the theoretical density was measured the results were that the ra was 72 nm and.