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:
Jul. 17, 2012
Filed:
Dec. 13, 2007
Ryuma Mizushima, Wakayama, JP;
Nobuyuki Takizawa, Wakayama, JP;
Ryuma Mizushima, Wakayama, JP;
Nobuyuki Takizawa, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The present invention relates to (1) a process for producing a water dispersion for ink-jet printing containing colorant-containing polymer particles which includes a step I of obtaining a dispersion of colorant-containing polymer particles; a step II of obtaining a water dispersion of the colorant-containing polymer particles from the dispersion obtained in the step I; a step III of mixing the water dispersion obtained in the step II with an organic solvent (B) to suitably control a relative dielectric constant of a mixed solvent in the resultant dispersion, thereby precipitating the colorant-containing polymer particles; and a step IV of separating precipitates obtained in the step III from the dispersion and re-dispersing the precipitates in a water-based solvent; (2) a water-based ink for ink-jet printing which is excellent in ejection stability and optical density; (3) a process for purifying a water dispersion for ink-jet printing; and (4) a process for producing a dispersion containing groups of fine particles.