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:
Jan. 28, 2014
Filed:
Sep. 17, 2008
Shigeki Nagashima, Wakayama, JP;
Hirotaka Takeno, Wakayama, JP;
Yuki Wakabayashi, Wakayama, JP;
Koji Azuma, Wakayama, JP;
Shigeki Nagashima, Wakayama, JP;
Hirotaka Takeno, Wakayama, JP;
Yuki Wakabayashi, Wakayama, JP;
Koji Azuma, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The present invention relates to a water dispersion for ink-jet printing including two kinds of carbon blacks (a) and (b) and a water-insoluble polymer which adheres to a surface of the respective carbon blacks (a) and (b), wherein the carbon black (a) has an acid group content of from 0 to 200 μmol/g and the carbon black (b) has an acid group content of more than 200 μmol/g but not more than 1000 μmol/g, and a difference between acid group contents of the carbon blacks (a) and (b) is from 100 to 1000 μmol/g, and a water-based ink for ink-jet printing which contains the water dispersion. The water-based ink is excellent in image density, fixing property, high lighter fastness, image uniformity, ejection reliability and storage stability.