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:
May. 22, 2007
Filed:
Apr. 23, 2004
Masayuki Momose, Suwa-shi Nagano-ken 392-8502, JP;
Miharu Kanaya, Suwa-shi Nagano-ken 392-8502, JP;
Sohko Itoh, Osaka-shi, Osaka 535-0022, JP;
Tatsuya Yagyu, Osaka-shi, Osaka 535-0022, JP;
Masayuki Momose, Suwa-shi Nagano-ken 392-8502, JP;
Miharu Kanaya, Suwa-shi Nagano-ken 392-8502, JP;
Sohko Itoh, Osaka-shi, Osaka 535-0022, JP;
Tatsuya Yagyu, Osaka-shi, Osaka 535-0022, JP;
Other;
Abstract
The present invention provides a water-based ink that is used in ink jet printer printing, with a writing instrument, or the like, that has a low settling rate and for which clogging is not prone to occurring, that can be stored stably for a long period without the viscosity or the carbon black particle diameter increasing, and for which printing with a deep black color and a high print density is possible, and a modified carbon black dispersion used for preparing this water-based ink. The present invention is a liquid having dispersed therein a modified carbon black obtained by subjecting a carbon black raw material powder to oxidation treatment, wherein the modified carbon black has on the surface thereof (a) carboxyl groups, and (b) lactone groups in a molar amount of at least 500 μmol/g relative to the weight of the modified carbon black and a molar ratio of 0.8 to 1.1 times the amount of the carboxyl groups.