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US 8,985,755 B2Granted
Ink, ink cartridge, and ink jet recording method
AssigneeCanon Kabushiki Kaisha
InventorsFumiaki Fujioka, Masashi Ogasawara, Keigo Gouda, Souichi Nagai, Akiko Yasuda
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Abstract
Provided is an ink for ink jet including a first pigment and a second pigment. Each of the first pigment and the second pigment comprises a self-dispersible carbon black in which a functional group containing two phosphonic acid groups is bonded to a particle surface. The average particle size of the first pigment is smaller than the average particle size of the second pigment. The introduced amount of the functional group of the first pigment is higher than the introduced amount of the functional group of the second pigment.
Claims6
An ink for ink jet, comprising:
- a first pigment;
- and
- a second pigment,
- wherein:
- each of the first pigment and the second pigment comprises a self-dispersible carbon black in which a functional group containing two phosphonic acid groups is bonded to a particle surface;
- an average particle size of the first pigment is smaller than an average particle size of the second pigment;
- and
- an introduced amount of the functional group of the first pigment is higher than an introduced amount of the functional group of the second pigment.
5 more elements
Dependencies are inferred from the claim text.