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:
Apr. 24, 2012
Filed:
Aug. 11, 2003
Hideaki Kaji, Ageo, JP;
Kazuhiro Kaneko, Osaka, JP;
Ritsuko Small, Blacksburg, VA (US);
Hiromichi Arakawa, Tokyo, JP;
Shinichi Okada, Kitaadachi-gun, JP;
Hiroshi Harada, Ageo, JP;
Sadahiro Inoue, Toda, JP;
Hideaki Kaji, Ageo, JP;
Kazuhiro Kaneko, Osaka, JP;
Ritsuko Small, Blacksburg, VA (US);
Hiromichi Arakawa, Tokyo, JP;
Shinichi Okada, Kitaadachi-gun, JP;
Hiroshi Harada, Ageo, JP;
Sadahiro Inoue, Toda, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Abstract
A process is provided for producing aqueous pigment dispersions for ink-jet recording in which fine pigments are stably dispersed and such a state can be maintained for a long period of storing. Moreover, a process is provided for producing aqueous pigment dispersions for ink-jet recording in which the time required for production such as dispersing time is short, and the production efficiency is high. The process for producing aqueous pigment dispersions for ink-jet recording includes a first step of kneading (1) a styrene-acrylic type resin with a styrene type monomer unit of 50 to 90 mass %, and at least one unit selected from an acrylic monomer unit and methacrylic monomer unit, having an acid value of 50 to 300, (2) a pigment, (3) a basic compound, and (4) a humectant to produce a solid colored kneaded product, and a second step of dispersing the solid colored kneaded product in an aqueous medium comprising water or water and humectant.