Oil-based inkjet ink
AssigneeRiso Kagaku Corporation
InventorsMarie Morinaga, Shinichiro Shimura, Kazuyuki Ando, Hikaru Sugiura
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Abstract
An oil-based inkjet ink can be provided which prevents dye conversion of a dye lake pigment contained in the ink, prevents adhesion of the ink to the nozzle plate, and yields excellent drying properties for printed items. The oil-based inkjet ink contains a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 20 mN/m but not more than 28 mN/m. The surface tension of the silicone oil is preferably at least 22 mN/m but not more than 26 mN/m.
Claims12
An oil-based inkjet ink comprising a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 22 mN/m but not more than 28 mN/m at 23° C.
An oil-based inkjet ink comprising a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 20 mN/m but not more than 28 mN/m at 23° C., and
- the silicone oil contains a modified silicone oil having 2 to 6 silicon atoms in one molecule, having an organic group in which a carbon atom is bonded directly to a silicon atom and in which a total number of carbon atoms and oxygen atoms is at least 5, and having a total number of carbon atoms and oxygen atoms, contained within all of the organic groups in which the total number of carbon atoms and oxygen atoms is at least 5, that is from 5 to 20 within one molecule.
Dependencies are inferred from the claim text.