Kao Corporation

Kosuke Muto

Tomohide Yoshida

The present invention relates to a method for producing an electrically conductive member which includes the step of applying an electrically conductive ink containing a metal fine particle dispersion to a substrate to form electrically conductive images on the substrate under ordinary-temperature environments, thereby obtaining the electrically conductive member, in which the metal fine particle dispersion contains metal fine particles (a) dispersed therein with a polymer B; a glass transition temperature of the polymer B is not higher than a temperature at which the electrically conductive images are formed on the substrate; and the substrate has a porous surface.

Method for manufacturing electrically conductive member

A metal fine particle-containing ink that contains metal fine particles dispersed therein with a polymer dispersant, a low-molecular weight carboxylic acid and an aqueous solvent, wherein the polymer dispersant contains a constitutional unit derived from an acid group-containing monomer; a content of the low-molecular weight carboxylic acid C in the ink is not less than 1% by mass and not more than 15% by mass. A boiling point (C) of the low-molecular weight carboxylic acid and a boiling point (D) of the aqueous solvent satisfy the following relational formula (I); and an acid dissociation exponent pKa (C) of the low-molecular weight carboxylic acid and an acid dissociation exponent pKa (B) of an acid group in the polymer dispersant satisfy the following relational formula (II):boiling point ()>boiling point ()   (I), andpKa ()<pKa ()   (II).

Ink containing fine metal particles

The present invention relates to a metal fine particle-containing ink containing metal fine particles (a) dispersed therein with a polymer B, in which the ink contains an ink solvent S; a difference ΔSP (|SP(S)−SP(B)|) between solubility parameters of the solvent S and the polymer B is not more than 1.5 (cal/cm)wherein SP(S) and SP(B) are a solubility parameter of the ink solvent S and a solubility parameter of the polymer B, respectively, as measured by a Fedors method; and the SP(B) is not less than 9.5 (cal/cm)and not more than 10.5 (cal/cm), as well as a method for producing a printed material, which includes the step of applying the metal fine particle-containing ink to a printing substrate to form a metal coating film of the ink on the printing substrate under ordinary-temperature environments, thereby obtaining the printed material.

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Sakai, Japan

Kosuke Muto