The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2011
Filed:
Oct. 09, 2009
Shinichi Hakamada, Kawasaki, JP;
Takashi Imai, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Sadayuki Sugama, Tsukuba, JP;
Shinichi Hakamada, Kawasaki, JP;
Takashi Imai, Yokohama, JP;
Mikio Sanada, Yokohama, JP;
Yasuhiro Nito, Yokohama, JP;
Tetsu Iwata, Yokohama, JP;
Sadayuki Sugama, Tsukuba, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
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.