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:
Jun. 21, 2011
Filed:
Sep. 05, 2006
Toshiyuki Matsumoto, Wakayama, JP;
Tsuyoshi Oda, Wakayama, JP;
Koji Kamei, Wakayama, JP;
Toshiya Iwasaki, Wakayama, JP;
Toshiyuki Matsumoto, Wakayama, JP;
Tsuyoshi Oda, Wakayama, JP;
Koji Kamei, Wakayama, JP;
Toshiya Iwasaki, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The present invention relates to a process for producing a water-based pigment dispersion which includes a first step of mixing (A) an emulsion composition including a water-insoluble polymer having a specific weight-average molecular weight and containing a salt-forming group, an organic solvent having a specific solubility in water, a neutralizing agent and water, with (B) a pigment to obtain a preliminary dispersion having a content of non-volatile components of from 5 to 50% by weight and a weight ratio of the organic solvent to water [organic solvent/water] of from 0.1 to 0.9; a second step of continuously dispersing the preliminary dispersion by using a media-type dispersing device and continuously separating the resultant dispersion from media particles; and a third step of further dispersing the resultant dispersion by using a homogenizer, as well as a water-based ink for ink-jet printing containing the water-based pigment dispersion which not only satisfies a high optical density but also exhibits excellent gloss and rubbing resistance.