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:
Mar. 25, 2014
Filed:
Dec. 11, 2009
Atsushi Hiraishi, Wakayama, JP;
Kyoichi Shirota, Wakayama, JP;
Yuki Wakabayashi, Wakayama, JP;
Yasuhiro Doi, Wakayama, JP;
Atsushi Hiraishi, Wakayama, JP;
Kyoichi Shirota, Wakayama, JP;
Yuki Wakabayashi, Wakayama, JP;
Yasuhiro Doi, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The present invention is directed to a water dispersion for ink-jet printing which realizes sufficient optical density and exhibits excellent filterability and storage stability; a water-based ink containing the water dispersion; and a process for producing the water dispersion or the water-based ink. The invention includes the following: (1) a water dispersion for ink-jet printing containing anionic colorant particles and cationic polymer particles, and a water-based ink for ink-jet printing containing the water dispersion; (2) a process for producing a water dispersion for ink-jet printing including a step of mixing a water dispersion of anionic colorant particles with a water dispersion of cationic polymer particles, to thereby produce a water dispersion of composite particles formed of the cationic polymer particles and the anionic colorant particles adhering thereto, and a water dispersion produced through the production process; and (3) a process for producing a water-based ink for ink-jet printing including step (A) of mixing a water dispersion of cationic polymer particles with a water-soluble organic solvent, or dispersing a cationic polymer in water and a water-soluble organic solvent, to thereby produce a dispersion containing the cationic polymer particles, water, and the water-soluble organic solvent; and step (B) of mixing the produced dispersion with a dispersion containing anionic colorant particles and water.