Water Based Ink For Ink-Jet Recording, Ink Cartridge, Ink-Jet Recording Apparatus, Method of Evaluating Water-Based Ink for Ink-Jet Recording, and Method of Producing Water-Based Ink for Ink-Jet Recording
AssigneeBrother Kogyo Kabushiki Kaisha
InventorGoro OKADA
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Abstract
A water-based ink for ink-jet recording includes a coloring agent, water, and a water-soluble organic solvent. In the water-based ink after drying, a phase (δ) obtained by a tan δ measured at about 25° C. is constantly about 45 degrees or more. In other words, the phase (δ) never becomes less than about 45 degrees at a strain amount of about 0.1% to about 100%.
Claims13
A water-based ink for ink-jet recording comprising a coloring agent, water, and a water-soluble organic solvent, wherein
- in the water-based ink after drying, a phase (δ) obtained by a tan δ at a strain amount of about 0.1% to about 100% measured at about 25° C. is constantly about 45 degrees or more.
A method of evaluating a water-based ink for ink-jet recording comprising:
- a drying process for drying the water-based ink;
- and
- a calculation process for calculating, at a temperature of about 25° C., a phase (δ) obtained by a tan δ of the water-based ink after drying at a strain amount of about 0.1% to about 100%.
A method of producing a water-based ink for ink-jet recording comprising a coloring agent, water, and a water-soluble organic solvent, wherein the method comprises:
- an evaluation process;
- and
- a preparation process, wherein
- in the evaluation process, after drying, an ink composition is decided so that a phase (δ) obtained by a tan δ at a strain amount of about 0.1% to about 100% measured at about 25° C. is constantly about 45 degrees or more, and wherein
- according to the decided ink composition, in the preparation process, the water-based ink is prepared.
Dependencies are inferred from the claim text.