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US 8,945,294 B2Granted
Ink composition for inkjet recording, inkjet recording method, and inkjet recorded material
AssigneeRicoh Company, Ltd.
InventorsAkihiko Matsuyama, Hiroshi Gotou
Life of this patent
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Abstract
An ink composition having organic pigment particles, a hydrosoluble solvent; a dispersing agent, and water, wherein each of the organic pigment particles has a circularity of 2 nm or less, which is defined as a difference between radii of concentric circumscribing and inscribed circles of a contour of an image of each of the organic pigment particles taken by a transmission electron microscope when a gap between the concentric circumscribing circle and the inscribed circle is least, wherein the inscribed circle has a diameter of from 5 nm to less than 50 nm.
Claims10
An ink composition comprising:
- organic pigment particles;
- wherein an organic pigment of the organic pigment particles is selected from the group consisting of α crystalline type metal free phthalocyanine, α crystalline type copper phthalocyanine, copper phthalocyanine modified by chlorine or bromine, quinacridone modified by methyl or chlorine, and diketopyrrolo pyrrole modified by methyl or chlorine;
- a hydrosoluble solvent;
- a dispersing agent;
- and
- water,
- wherein each of the organic pigment particles has a circularity of 2 nm or less, which is defined as a difference between radii of concentric circumscribing and inscribed circles of a contour of an image of each of the organic pigment particles taken by a transmission electron microscope when a gap between the concentric circumscribing circle and the inscribed circle is least,
- wherein the inscribed circle has a diameter of from 5 nm to less than 50 nm.
5 more elements
Dependencies are inferred from the claim text.