C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 11/00 (2006.01) B41J 2/01 (2006.01) C09D 11/02 (2006.01)
Patent
CA 2511100
A water-based ink of the present invention comprises water, a plurality of different water--soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the greatest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink and provides an image of high OD.
L'invention concerne une encre à base aqueuse qui comprend de l'eau, de multiples solvants organiques hydrosolubles de différents types et un matériau coloré insoluble dans l'eau. Les multiples solvants organiques hydrosolubles comprennent un bon solvant pour le matériau coloré insoluble dans l'eau et un faible solvant pour le matériau coloré insoluble dans l'eau. En admettant que A représente la quantité totale ( % en masse) de bon solvant dans l'encre et que B représente la quantité totale ( % en masse) de faible solvant dans l'encre, le rapport A:B est compris dans la plage 10:5 à 10:30. Lors de la comparaison des valeurs Ka respectives des multiples solvants organiques hydrosolubles, déterminées selon le procédé Bristow, le solvant organique hydrosoluble qui possède la valeur Ka maximale est un faible solvant. Par rapport à des encres à pigments, des images à OD élevé possédant un facteur de largeur suffisamment grand peuvent être obtenues même avec de petites quantités de gouttes d'encre.
Ogasawara Masashi
Sanada Mikio
Takahashi Katsuhiko
Tokuda Yui
Watanabe Tomonari
Canon Kabushiki Kaisha
Ridout & Maybee Llp
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