An ink contains water, a coloring material, a resin, two or more types of organic solvents, and a surfactant, wherein the ink is horizontally discharged to a substrate.

An ink set includes: a first ink containing a first anion which is at least one selected from the group consisting of a nitrate ion, an acetate ion, an acrylic acid ion, a formic acid ion, and a methacrylic acid ion; and a second ink containing a second anion which is at least one selected from the group consisting of a sulfate ion, a phosphate ion, and an oxalate ion, wherein the first ink satisfies the following condition (A) and condition (B) and the second ink satisfies the following condition (C) and condition (D):

X1≧50   Condition (A):

X1/(X1+X2)>0.6   Condition (B): X1: concentration of the first anion in the first ink (ppm) X2: concentration of the second anion in the first ink (ppm)

Y2≧40   Condition (C):

Y1/(Y1+Y2)<0.6   Condition (D): Y1: concentration of the first anion in the second ink (ppm) Y2: concentration of the second anion in the second ink (ppm).

An ink set includes: a first ink containing a first anion which is at least one selected from the group consisting of a nitrate ion, an acetate ion, an acrylic acid ion, a formic acid ion, and a methacrylic acid ion; and a second ink containing a second anion which is at least one selected from the group consisting of a sulfate ion, a phosphate ion, and an oxalate ion, wherein the first ink satisfies the following condition (A) and condition (B) and the second ink satisfies the following condition (C) and condition (D):

X1≧50   Condition (A):

X1/(X1+X2)>0.6   Condition (B): X1: concentration of the first anion in the first ink (ppm) X2: concentration of the second anion in the first ink (ppm)

Y2≧40   Condition (C):

Y1/(Y1+Y2)<0.6   Condition (D): Y1: concentration of the first anion in the second ink (ppm) Y2: concentration of the second anion in the second ink (ppm).

Provided is an ink for use in electronic component production making use of screen printing, which is suitable for actually allowing fine lines with high precision to be drawn in screen printing, and for actually allowing successive screen printing operations to be performed. The ink for screen printing of the present invention includes surface-modified silver nanoparticles (A) and a solvent (B), and has a viscosity at a shear rate of 10 (1/s) and 25° C. of 60 Pa.Math.s or more. The surface-modified silver nanoparticles (A) each include a silver nanoparticle and an amine-containing protective agent coating the silver nanoparticle. The solvent (B) includes at least a terpene solvent. In solvent (B), a content of solvents having a boiling point of less than 130° C. is 20 wt % or less based on the total amount of solvents.

Provided is an ink for use in electronic component production making use of screen printing, which is suitable for actually allowing fine lines with high precision to be drawn in screen printing, and for actually allowing successive screen printing operations to be performed. The ink for screen printing of the present invention includes surface-modified silver nanoparticles (A) and a solvent (B), and has a viscosity at a shear rate of 10 (1/s) and 25° C. of 60 Pa.Math.s or more. The surface-modified silver nanoparticles (A) each include a silver nanoparticle and an amine-containing protective agent coating the silver nanoparticle. The solvent (B) includes at least a terpene solvent. In solvent (B), a content of solvents having a boiling point of less than 130° C. is 20 wt % or less based on the total amount of solvents.

An aqueous inkjet ink comprises a compound functionalized with at least two functional groups selected from the group consisting of a primary amine and a secondary amine, a colorant and a polymeric particle comprising an oligomer or polymer having at least 3 repeating units comprising a functional group according to general formula I, II or III general formula I general formula II general formula III

##STR00001##

An aqueous inkjet ink comprises a compound functionalized with at least two functional groups selected from the group consisting of a primary amine and a secondary amine, a colorant and a polymeric particle comprising an oligomer or polymer having at least 3 repeating units comprising a functional group according to general formula I, II or III general formula I general formula II general formula III

##STR00001##

A cationic polymer nanoparticle, functionalized with primary amines, characterized in that said nanoparticle comprises a resin having at least a) a repeating unit selected from the group consisting of an allyl amine and a vinyl amine, b) an oxalyl amide crosslinking unit and c) a repeating unit according to general formula (I) and/or general formula (II); the particle can be dispersed in an aqueous vehicle to be used in inkjet printing.

A cationic polymer nanoparticle, functionalized with primary amines, characterized in that said nanoparticle comprises a resin having at least a) a repeating unit selected from the group consisting of an allyl amine and a vinyl amine, b) an oxalyl amide crosslinking unit and c) a repeating unit according to general formula (I) and/or general formula (II); the particle can be dispersed in an aqueous vehicle to be used in inkjet printing.

A film-forming ink includes a film-forming material and a liquid medium in which the film-forming material is dissolved or dispersed. The liquid medium contains a first component which has a viscosity of less than 20 cp and a second component which has a boiling point at an atmospheric pressure within a range of ±30° C. relative to the boiling point at an atmospheric pressure of the first component and has a viscosity of 20 cp or more, and the second component is contained in an amount of 20 parts by weight or more and 500 parts by weight or less with respect to 100 parts by weight of the first component.