Abstract: A water-based pigment type inkjet ink composition contains: a pigment whose surface is formed as a resin layer produced by crosslinking, using a crosslinking agent having two or more functionalities, an alkali-soluble resin whose acid value is 40 to 300 KOHmg/g, and 50 to 90% of whose acid groups have been neutralized by a basic compound; a water-soluble organic solvent; and a surface-active agent; wherein the alkali-soluble resin is such that lauryl(meth)acrylate is contained in the alkali-soluble resin, as its constitutional unit monomer, by 20 to 40 percent by mass relative to the total quantity of monomers. The water-based pigment type inkjet ink composition can exhibit good printability characteristics as well as a wide color gamut and can also offer excellent storage stability.

Abstract: A water-based pigment type inkjet ink composition contains: a pigment whose surface is formed as a resin layer produced by crosslinking, using a crosslinking agent having two or more functionalities, an alkali-soluble resin whose acid value is 40 to 300 KOHmg/g, and 50 to 90% of whose acid groups have been neutralized by a basic compound; a water-soluble organic solvent; and a surface-active agent; wherein the alkali-soluble resin is such that lauryl(meth)acrylate is contained in the alkali-soluble resin, as its constitutional unit monomer, by 20 to 40 percent by mass relative to the total quantity of monomers. The water-based pigment type inkjet ink composition can exhibit good printability characteristics as well as a wide color gamut and can also offer excellent storage stability.

Abstract: A photocurable ink composition for inkjet printing is obtained that has superior curability with respect to light from a light-emitting diode, has favorable adhesion to a polyvinyl chloride-based sheet, and is able to adequately inhibit the occurrence of cockling.

Abstract: A photocurable ink composition for inkjet printing is obtained that has superior curability with respect to light from a light-emitting diode, has favorable adhesion to a polyvinyl chloride-based sheet, and is able to adequately inhibit the occurrence of cockling.

Abstract: An object of the present invention is to provide a photocurable ink composition for ink-jet printing, which exhibits excellent curing properties in response to light from light emitting diodes (LEDs), is adhered well to a polyvinyl chloride sheet such as tarpaulin or a vinyl chloride resin sheet, can sufficiently reduce cockling, has a low viscosity but a high flash point, and can achieve both of good jetability at a normal temperature and good safety properties owing to these properties. The ink composition for ink-jet printing includes at least: photopolymerizable compounds; a photopolymerization initiator; and a sensitizer, and has a flash point of higher than 60° C. when measured with a SETA closed-cup flash point tester by a method in accordance with JIS K2256. The photopolymerizable compounds include 2-methoxyethyl acrylate and/or 2-ethoxyethyl acrylate, and N-vinyl caprolactam, and an acrylated amine compound having two photopolymerizable functional groups and two amino groups in the molecule.