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:
Dec. 09, 2008
Filed:
Mar. 04, 2004
Hiroaki Ohno, Kita-ku, JP;
Toru Yamaguchi, Saitama, JP;
Takahiko Matsui, Kita-ku, JP;
Takashi Yoneda, Kita-ku, JP;
Yoshiaki Kawaida, Kita-ku, JP;
Yasuo Shirasaki, Kita-ku, JP;
Kazunobu Nagasaki, Adachi-ku, JP;
Hiroaki Ohno, Kita-ku, JP;
Toru Yamaguchi, Saitama, JP;
Takahiko Matsui, Kita-ku, JP;
Takashi Yoneda, Kita-ku, JP;
Yoshiaki Kawaida, Kita-ku, JP;
Yasuo Shirasaki, Kita-ku, JP;
Kazunobu Nagasaki, Adachi-ku, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to a water-based black ink composition comprising a water-soluble black dye (A) exhibiting ozone fastness and a condensate compound (B) of 4,4'-dinitrostilbene-2,2′-disulfonic acid and aminobenzenes or a reduction product (C) thereof. Said ink composition is suitable for use in ink-jet recording, and realizes neutral hue and black color of high printing density. Further, a printed matter obtained is excellent in ozone gas fastness, light fastness, moisture fastness and color rendering properties. Still further, storage stability as a recording liquid is excellent.