Black pigment ink and method for producing the same
AssigneeHitachi Maxell, Ltd.
InventorsShoji Saibara, Shigeo Aoyama, Yuichi Sakurai, Kouji Takazawa
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Abstract
Disclosed is a black pigment ink suitable for ink jet recording which comprises carbon black, a dispersant containing polyethylene oxide and 0.1-5 mmols/g of amino group, and a solvent such as water. The ink is excellent in storage stability, causes no clogging of head and provides printed images of excellent quality and high light resistance.
Claims14
A black pigment ink which comprises a carbon black, 0.1-20% by weight based on the total weight of the ink composition of a dispersant containing polyethylene oxide and 0.1-5 mmols/g of an amino group, and a solvent;
- wherein the carbon black is in the form of ultrafine particles having a particle diameter of 100 nm or less.
A process for producing a black pigment ink which comprises dispersing a carbon black, 0.1-20% by weight based on the total weight of the ink composition of a dispersant containing polyethylene oxide and 0.1-5 mmols/g of an amino group and a solvent, in the presence of ceramic beads having a particle diameter of 0.01-1.0 mm;
- wherein the carbon black is in the form of ultrafine particles having a particle diameter of 100 nm or less.
A process for printing a black pigment ink which comprises squirting ink droplets from a printing head, wherein the black pigment comprises:
- a carbon black, 0.1-20% by weight based on the total weight of the ink composition of a dispersant containing polyethylene oxide and 0.1-5 mmols/g of an amino group, and a solvent;
- wherein the carbon black is in the form of ultrafine particles having a particle diameter of 100 nm or less.
Dependencies are inferred from the claim text.