AQUEOUS INK, AQUEOUS INK SET, INK CARTRIDGE, INKJET RECORDER, INKJET RECORDING METHOD, AND IMAGE FORMING METHOD
申请人:CANON KABUSHIKI KAISHA
公开号:EP1762598A1
公开(公告)日:2007-03-14
An aqueous ink comprises water, a water-insoluble coloring material, and plurality of water-soluble organic solvents and the plurality of water-soluble organic solvents including a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material. The ratio of the content of the poor medium and the content of the good medium is in a specific range. A water-soluble organic solvent showing the maximum Ka value out of respective Ka values of the plurality of water-soluble organic solvents is the poor medium. When the aqueous ink is in contact with a specific reaction liquid, the dissolution state or dispersed state of the water-insoluble coloring material in the ink is made unstable. As a result, an image which has a sufficiently large area factor even with a small amount of ink droplets and is excellent in image density, bleeding resistance, and fixability can be obtained. In addition, the aqueous ink is excellent in storage stability.
水性油墨包括水、水不溶性着色材料和多种水溶性有机溶剂,多种水溶性有机溶剂包括水不溶性着色材料的一种或多种良好介质和水不溶性着色材料的一种或多种不良介质。贫介质的含量与好介质的含量之比在特定范围内。在多种水溶性有机溶剂各自的 Ka 值中,Ka 值最大的一种水溶性有机溶剂是劣质介质。当水性油墨与特定的反应液接触时,油墨中的水不溶性着色材料的溶解状态或分散状态会变得不稳定。因此,即使只有少量墨滴,也能获得面积系数足够大的图像,而且图像密度、抗渗漏性和固定性都非常好。此外,水性油墨还具有出色的储存稳定性。