Provided is a photo-curable inkjet printing ink composition, comprising (A) an acrylicated amine compound having two photopolymerizable functional groups and two amino groups in a molecule, (B) a (meth)acrylic monomer having an alkoxy group, and (C) at least one selected from the group consisting of hexanediol acrylate, 3-methyl-1,5-pentanediol diacrylate, dipropylene glycol diacrylate, and neopentyl glycol diacrylate hydroxypivalate, wherein a content of the component (A) is 3 to 18% by mass in the ink composition, wherein a content of the component (B) is 5 to 35% by mass in the ink composition, and wherein a content of the component (C) is 30 to 60% by mass in the ink composition.

The electroconductive inkjet ink disclosed herein contains at least inorganic powder containing high melting point metal particles, a dispersant, an organic solvent, and a poly(vinyl acetal) resin. In the electroconductive ink, the inorganic powder has an average primary particle diameter of 500 nm or less, a volume ratio of the inorganic powder is 7.5% by volume or lower, the ratio (S.sub.I/V.sub.D) of the specific surface area of the inorganic powder with respect to the volume of the dispersant is 0.25 or higher and 10 or lower, the poly(vinyl acetal) resin has an average molecular weight of 2.5×10.sup.4 or larger and 6.4×10.sup.4 or smaller, and the ratio (W.sub.PA/W.sub.S) of the weight of the poly(vinyl acetal) resin with respect to the weight of the organic solvent is 0.5% by weight or higher and 3% by weight or lower.

The electroconductive inkjet ink disclosed herein contains at least inorganic powder containing high melting point metal particles, a dispersant, an organic solvent, and a poly(vinyl acetal) resin. In the electroconductive ink, the inorganic powder has an average primary particle diameter of 500 nm or less, a volume ratio of the inorganic powder is 7.5% by volume or lower, the ratio (S.sub.I/V.sub.D) of the specific surface area of the inorganic powder with respect to the volume of the dispersant is 0.25 or higher and 10 or lower, the poly(vinyl acetal) resin has an average molecular weight of 2.5×10.sup.4 or larger and 6.4×10.sup.4 or smaller, and the ratio (W.sub.PA/W.sub.S) of the weight of the poly(vinyl acetal) resin with respect to the weight of the organic solvent is 0.5% by weight or higher and 3% by weight or lower.

An ink set including an aqueous inkjet ink composition and a primer composition. The aqueous inkjet ink composition contains a pigment, an alkali-soluble resin, a resin emulsion, a surfactant, a water-soluble solvent, and water; the resin emulsion contains a polyurethane resin emulsion and/or a polyolefin resin emulsion; the surfactant contains an alkyl sulfonate and/or a polyoxyethylene alkyl ether sulfate; the aqueous inkjet ink composition has a content of the alkyl sulfonate and/or the polyoxyethylene alkyl ether sulfate of 0.05% by mass or more and 0.5% by mass or less; and the primer composition contains an aggregation accelerator that accelerates aggregation of the aqueous inkjet ink composition. The ink set provides a printed matter having good print image quality and excellent abrasion resistance, and has good storage stability and ejection stability.

An ink set including an aqueous inkjet ink composition and a primer composition. The aqueous inkjet ink composition contains a pigment, an alkali-soluble resin, a resin emulsion, a surfactant, a water-soluble solvent, and water; the resin emulsion contains a polyurethane resin emulsion and/or a polyolefin resin emulsion; the surfactant contains an alkyl sulfonate and/or a polyoxyethylene alkyl ether sulfate; the aqueous inkjet ink composition has a content of the alkyl sulfonate and/or the polyoxyethylene alkyl ether sulfate of 0.05% by mass or more and 0.5% by mass or less; and the primer composition contains an aggregation accelerator that accelerates aggregation of the aqueous inkjet ink composition. The ink set provides a printed matter having good print image quality and excellent abrasion resistance, and has good storage stability and ejection stability.

Composite compositions comprising metal nanoparticles and/or microparticles and a binder are provided. Composites are tunable to achieved specific desired characteristics, such as sintering temperature, melting temperature, print resolution, and surface binding capabilities. Preferably, the metal particles may be produced using plasma-based technology. The composites are spreadable or printable and are especially useful in the field of electronics. The composites are capable of being used to form highly conductive wires or traces in electronic components. Preferably, the resulting metal structure has a low level of metal oxidation. The disclosure also includes methods for producing composite materials.

Composite compositions comprising metal nanoparticles and/or microparticles and a binder are provided. Composites are tunable to achieved specific desired characteristics, such as sintering temperature, melting temperature, print resolution, and surface binding capabilities. Preferably, the metal particles may be produced using plasma-based technology. The composites are spreadable or printable and are especially useful in the field of electronics. The composites are capable of being used to form highly conductive wires or traces in electronic components. Preferably, the resulting metal structure has a low level of metal oxidation. The disclosure also includes methods for producing composite materials.

The present invention provides a silver coating composition that develops excellent conductivity (low resistance value) by low-temperature and short-time calcining, and that is excellent in fine-line drawing performance and suitable for intaglio offset printing. A silver particle coating composition comprising: silver nano-particles (N) whose surfaces are coated with a protective agent containing an aliphatic hydrocarbon amine; a surface energy modifier; and a dispersion solvent. The surface energy modifier may be selected from the group consisting of a silicon-based surface energy modifier and an acrylic surface energy modifier. The coating composition preferably further comprises silver microparticles (M). The silver coating composition is suitable for intaglio offset printing.

A printing method includes: a processing fluid applying step of applying a processing fluid containing silica and a multivalent metal salt to a print medium; and an ink applying step of applying an ink containing a coloring material and water to the print medium. The print medium has a Cobb water absorption of 20 g/m.sup.2 or greater but 75 g/m.sup.2 or less when contacted with water for 120 seconds. The Cobb water absorption is stipulated by JIS-P8140.

A printing method includes: a processing fluid applying step of applying a processing fluid containing silica and a multivalent metal salt to a print medium; and an ink applying step of applying an ink containing a coloring material and water to the print medium. The print medium has a Cobb water absorption of 20 g/m.sup.2 or greater but 75 g/m.sup.2 or less when contacted with water for 120 seconds. The Cobb water absorption is stipulated by JIS-P8140.