Patent ID: 7708910
Filing Date: 2010-05-04
Classification: C09D,H01B,H05K,Y10S,Y10T

Abstract:
1. A method for preparing an ink jet printing ink consisting of an independently dispersed metal ultrafine particles-containing liquid dispersion, consisting of metal ultrafine particles, solvent, and dispersant; comprising: a first step in which a metal is evaporated in a gas atmosphere in the presence of vapor of a first solvent to thus bring the metal vapor into contact with the vapor of the first solvent, and the vapor mixture is cooled and collected to give a metal ultrafine particles-containing liquid dispersion in which the metal ultrafine particles are dispersed in the solvent; a second step in which a low molecular weight polar solvent, as a second solvent, is added to the liquid dispersion prepared in the first step to precipitate the metal ultrafine particles and the resulting supernatant is removed to thus substantially remove the first solvent; and a third step in which a third solvent is added to the precipitates thus recovered to give an independently dispersed metal ultrafine particles-containing liquid dispersion; wherein the dispersant is added in the first step or the third step, and the dispersant is selected from the group consisting of octylamine, laurylamine and butylamine, wherein the first solvent is α-terpineol, the second solvent is acetone, and third solvent is selected from the group consisting of dodecane, octanol and xylene.