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US 9,956,761 B2Granted
Ink, ink cartridge, and ink jet recording method
AssigneeCanon Kabushiki Kaisha
InventorsYoshihisa Yamashita, Yuko Negishi, Ryuki Nanamiya, Toshiyuki Umesato
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Abstract
An aqueous ink for ink jet containing a self-dispersible pigment, an aromatic sulfinic acid or a salt thereof and an aromatic sulfonic acid or a salt thereof.
Claims17
An aqueous ink for ink jet, the aqueous ink comprising:
- a self-dispersible pigment;
- an aromatic sulfinic acid or a salt thereof;
- and
- an aromatic sulfonic acid or a salt thereof,
- wherein a concentration (mmol/kg) of a sulfonic acid group derived from the aromatic sulfonic acid or the salt thereof is 0.25 mmol/kg or more to 15.00 mmol/kg or less.
2 more elements
An aqueous ink for ink jet, the aqueous ink comprising:
- a self-dispersible pigment;
- an aromatic sulfinic acid or a salt thereof;
- and
- an aromatic sulfonic acid or a salt thereof,
- wherein a concentration (mmol/kg) of a sulfinic acid group derived from the aromatic sulfinic acid or the salt thereof is 0.05 mmol/kg or more to 3.50 mmol/kg or less.
2 more elements
An aqueous ink for ink jet, the aqueous ink comprising:
- a self-dispersible pigment;
- an aromatic sulfinic acid or a salt thereof;
- and
- an aromatic sulfonic acid or a salt thereof,
- wherein a molar ratio of a concentration (mmol/kg) of a sulfonic acid group derived from the aromatic sulfonic acid or the salt thereof is 5.0 times or more to 50.0 times or less to a concentration (mmol/kg) of a sulfinic acid group derived from the aromatic sulfinic acid or the salt thereof.
2 more elements
Dependencies are inferred from the claim text.