Inkjet recording ink and image forming method
AssigneeRicoh Company, Ltd.
InventorsShin Hasegawa, Minoru Hakiri, Mitsuru Naruse, Hiroyuki Fushimi
Life of this patent
Estimating the term…
Abstract
An inkjet recording ink which includes: a carbon black; a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate; resin emulsion; and water, in which the resin emulsion contains a resin which is at least one of a urethane resin and a styrene-acryl resin, and the ink satisfies the following relationship: 20≦B−A≦50, where A(nm) represents a particle diameter D90 of particles contained in dispersion containing the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles contained in the ink.
Claims9
An inkjet recording ink comprising:
- a carbon black;
- a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate in which a total amount of a dimer, trimer and tetramer of naphthalenesulfonate is 20% by mass to 80% by mass with respect to the total amount of the condensate;
- resin emulsion;
- and
- water,
- wherein the resin emulsion comprises a resin which is at least one of a urethane resin and a styrene-acryl resin, and
- wherein the ink satisfies the following relationship:
- 20≦B−A≦50,
- where A(nm) represents a particle diameter D90 of particles in dispersion comprising the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles in the ink.
An ink cartridge, comprising:
- a housing;
- and
- an inkjet recording ink housed in the housing,
- wherein the inkjet recording ink comprises:
- a carbon black;
- a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate in which a total amount of a dimer, trimer and tetramer of naphthalenesulfonate is 20% by mass to 80% by mass with respect to the total amount of the condensate;
- resin emulsion;
- and
- water,
- wherein the resin emulsion comprises a resin which is at least one of a urethane resin and a styrene-acryl resin, and
- wherein the ink satisfies the following relationship:
- 20B−A≦50,
- where A(nm) represents a particle diameter D90 of particles in dispersion comprising the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles in the ink.
An image forming method, comprising:
- printing using an inkjet recording ink by means of an inkjet recording apparatus,
- wherein the inkjet recording apparatus is equipped with an inkjet head comprising an ink-repellent layer formed by PTFE-Ni eutectoid plating, or a treatment with a fluororesin or a silicone resin,
- wherein the inkjet recording ink comprises:
- a carbon black;
- a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate in which a total amount of a dimer, trimer and tetramer of naphthalenesulfonate is 20% by mass to 80% by mass with respect to the total amount of the condensate;
- resin emulsion;
- and
- water,
- wherein the resin emulsion comprises a resin which is at least one of a urethane resin and a styrene-acryl resin, and
- wherein the ink satisfies the following relationship:
- 20B−A≦50,
- where A(nm) represents a particle diameter D90 of particles in dispersion comprising the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles in the ink.
Dependencies are inferred from the claim text.