Nippon Kayaku Kabushiki Kaisha

Hirokazu Kitayama

Yasuo Shirasaki

Takafumi Fujii

Hiroyuki Matsumoto

Hiroaki Ohno

Takahiko Matsui

Toru Tabei

Yoshinori Katoh

Shinichi Namba

The present invention relates to a phthalocyanine colorant characterized in that it has, as substituents, at least one unsubstituted sulfamoyl group and at least one substituted sulfamoyl group, the total number of these groups being 2 to 4, the substituent on the substituted sulfamoyl group has a substituted triazinyl group bonded thereto through a crosslinking group, and the unsubstituted sulfamoyl group and the substituted sulfamoyl group are bonded to the phthalocyanine ring at the &#x3b2;-position. Said phthalocyanine colorant is suitable for use in an ink, especially a cyan ink, for an ink-jet printer. A printed matter obtained by printing with said ink is excellent in light fastness, ozone fastness and moisture fastness.

Phthalocyanine colorant and use thereof for ink-jet printing

An azo compound which is reduced in the copper ion content and exhibits hue and clarity suitable for ink-jet recording and which can give records having excellent light fastness, water resistance, and moisture proofness, and such ozone resistance as to control the fading and the discoloration; and water-base yellow inks containing the same. In particular, the azo compound represented by the formula (12) having a content of impurity copper ions of 100 ppm or below or salts thereof, and inks containing the same 

Azo compound, aqueous dye solutions containing the same, inks and use thereof

An aqueous ink composition which comprises a compound represented by the formula (1) or the salt thereof: (1) wherein Rand Rindependently represent a hydrogen atom, an alkyl group, an alkoxy group, an alkanoylamino group, an alkoxyalkoxy group, a sulfonic acid group, a carboxyl group or an ureido group, m and n independently represent 1 or 2, and Mrepresents a cation from a hydrogen atom, an alkali metal, an alkaline earth metal or an organic amine, or an ammonium ion. The composition has a hue and clarity suitable for the ink-jet recording, and can provide a recorded matter which is excellent in light resistance, water resistance and moisture resistance and can be controlled with respect to the degree of the discoloration or fading by the action of ozone. 

Aqueous ink composition, water-soluble dye composition and ink-jet recording method

Anthrapyridone compounds, water-based magenta ink composition, and method of ink-jet printing

Phthalocyanine compounds, water-base ink compositions and colored products

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Kita-ku, Japan

Hirokazu Kitayama