Inkjet ink
AssigneeRiso Kagaku Corporation
InventorToshihiro Endo
Life of this patent
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Abstract
An inkjet ink is provided, which is hardly wettable to the surface of nozzle plates, and thus is stably ejected and is prevented from staining images. The inkjet ink is an oil-based inkjet ink which contains at least a pigment, a pigment-dispersing agent and a solvent constituted by at least an ester solvent, a salt of a long-chain polyaminoamide and a polar acidic ester in an amount of 1% by weight or more relative to the total amount of the ink.
Claims9
An oil-based inkjet ink which comprises at least a pigment, a pigment-dispersing agent and a solvent, in which said solvent comprises at least an ester solvent, said inkjet ink further comprising a salt of a long-chain polyaminoamide and a polar acidic ester in an amount of 1% by weight or more relative to the total amount of the ink, in which said pigment-dispersing agent is a polyamide-based dispersing agent that has a pectinated structure constituted by a plurality of side chains composed of polyesters, and wherein said oil-based inkjet ink has an improved and lowered wettability to the surface of nozzle plates when said ink is used.
An oil-based inkjet ink comprising:
- at least a pigment,
- a pigment-dispersing agent,
- a solvent wherein said solvent comprises at least an ester solvent, and
- a repellency agent comprising a salt of a long-chain polyaminoamide and a polar acidic ester in an amount of 1% by weight or more relative to the total amount of the ink,
- wherein said pigment-dispersing agent is a polyamide-based dispersing agent that has a pectinated structure constituted by a plurality of side chains composed of polyesters, and said oil-based inkjet ink having an improved and reduced wettability to the surface of nozzle plates when said ink is used.
A method for providing improved repellency to an oil-based inkjet ink from the surfaces of nozzle plates comprising adding a repellency agent to an oil-based inkjet ink, said repellency agent comprising a salt of a long-chain polyaminoamide and a polar acidic ester in an amount of 1% by weight or more relative to the total amount of the ink, wherein said oil-based inkjet ink composition to which said repellency agent is added comprises at least a pigment, a pigment-dispersing agent other than said repellency agent, and a solvent wherein said solvent comprises at least an ester solvent, wherein said pigment-dispersing agent is a polyamide-based dispersing agent that has a pectinated structure constituted by a plurality of side chains composed of polyesters, and wherein said oil-based inkjet ink has an improved and lowered wettability to the surface of nozzle plates when said ink is used.
Dependencies are inferred from the claim text.