C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 11/00 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01)
Patent
CA 2565700
Disclosed is an aqueous ink comprising at least water, a plurality of water-soluble organic solvents and a coloring material. The coloring material is a pigment, and, it contains a pigment particle having at least one ionic group bonded to a surface of the pigment particle directly or via another atomic group. The plurality of water-soluble organic solvents have a good medium or good mediums for the pigment and a poor medium or poor mediums for the pigment. The poor medium does not solvate perfectly or substantially the pigment. The ionic group undergoes perfectly or substantially no ionic dissociation in the poor medium. Also, among the respective Ka values of the plurality of water-soluble organic solvents as determined by the Bristow method, the Ka value of the poor medium is maximum.
Il est prévu une encre aqueuse contenant de l~eau, une pluralité de solvants organiques solubles dans l~eau et un colorant. Le colorant se compose d~un pigment, et au moins un groupe ionique est lié à la surface d~une particule de pigment directement ou par le biais d~un autre groupe atomique. Les solvants organiques solubles dans l~eau contiennent un bon solvant et un solvant médiocre pour le pigment. Le solvant médiocre ne solvate pas le pigment du tout ou bien ne solvate pas sensiblement le pigment. Le groupe ionique n~est pas dissocié du tout ou n~est pas dissocié sensiblement dans le solvant médiocre. En outre, un solvant médiocre présente la valeur Ka la plus élevée, qui est déterminée par le procédé Bristow, parmi les solvants organiques solubles dans l~eau.
Hakamada Shinichi
Imai Takashi
Iwata Tetsu
Kitamura Yui
Nito Yasuhiro
Canon Kabushiki Kaisha
Ridout & Maybee Llp
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