Ink composition, ink cartridge, inkjet recording device, and inkjet printed matter
AssigneeRicoh Company, Ltd.
InventorsAkihiko Matsuyama, Mitsuru Naruse, Masayasu Nonogaki, Kazukiyo Nagai, Keita Katoh, Yuusuke Koizuka
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Abstract
An ink composition contains a pigment; a copolymer comprising a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1 and satisfies the following relation 1: Y/X≦0.20 Relation 1 where X represents a peak intensity at a Bragg (2θ±0.2°) angle in a range of 2θ of from 26.5° to 27.5° and Y represents a peak intensity at a Bragg (2θ±0.2°) angle in a range of 2θ of from 11.0° to 11.5° to a CuKα X-ray having a wavelength of 1.541 Å.
Claims14
An ink composition comprising:
- a pigment;
- a copolymer comprising a phosphoric acid group or phosphonic acid group;
- a hydrosoluble solvent;
- and
- water,
- wherein the pigment is represented by formula 1 and satisfies the following relation 1:
- Y/X≦0.20 Relation 1
- where X represents a peak intensity at a Bragg (2θ±0.2°) angle in a range of 2θ of from 26.5° to 27.5° and Y represents a peak intensity at a Bragg (2θ±0.2°) angle in a range of 2θ of from 11.0° to 11.5° to a CuKα X-ray having a wavelength of 1.541 Å
- wherein the copolymer comprising a phosphoric acid group comprises one of a structure unit represented by formula 2 and a structure unit derived from a radical polymerizable monomer having a diphosphonic acid group:
- where R1 represents a methyl group or a hydrogen atom, n and m each, independently represent 0 or integers of from 1 to 6 excluding both being 0 at the same time and where at least one of n and m is an integer of at least 2, and M each, independently represents hydrogen atoms, alkali metals, or organic amines.
Dependencies are inferred from the claim text.