Fujifilm Corporation

Fuji Photo Film Company, Limited

Tomohiro Chino

Toshiki Fujiwara

Yoshiharu Yabuki

Toru Harada

Keiichi Tateishi

Masaru Takasaki

Takashi Ozawa

Toshiki Taguchi

Toshiaki Aono

Shigeaki Tanaka

Naotaka Wachi

A coloring composition containing a dis-azo compound or poly-azo compound which contains two or more substituents having a pKa value in water of &#x2212;i0 to 5 and which has an oxidation potential more positive than 0.8 V (vs SCE), and an inkjet recording ink composition containing the coloring composition and an inkjet recording method wherein an image is formed on an image-receiving material containing a support having provided thereon an ink receiving layer containing a white inorganic pigment particle, using the inkjet recording ink composition.

Color composition and inkjet recording method

An aqueous ink for ink jet recording, which comprises: at least one dye; and at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and a compound having at least two phosphonic acid groups as a print density improver(s), a print density improver, and a method for enhancing print density involving the use of the aforementioned print density improver.

Ink for ink jet recording comprising print density improver, print density improver and method for improving print density

An ink containing an azo dye having, in total, at least 13 conjugated &#x3c0; electrons in an aromatic ring thereof that is not directly bonded to any azo group.

Ink and ink-jet recording ink

A black ink for inkjet recording having an aqueous medium containing a dye in which &#x3bb;max of the absorption spectrum in an aqueous solution is in the region from 500 and 700 nm and the half-value width in the absorption spectrum of a dilute solution standardized to an absorbance of 1.0 is 100 nm or more. An object of the present invention is to provide an inkjet recording ink ensuring excellent discharge stability even after aging of the ink and also exhibiting excellent weather resistance.

Black ink for inkjet recording and inkjet recording method

The present invention provides an ink for inkjet recording capable of giving a color image having excellent fastness to ozone gas and provides an ink set for inkjet recording and an inkjet recording method, which can form an image having excellent color reproducibility and high light fastness, in which the ink for inkjet recording includes an azo dye having a specific structure; an ink set for inkjet recording, including a yellow ink, a magenta ink and a cyan ink as minimum constituent elements, wherein these inks includes the above-described azo dye; and an inkjet recording method using the ink for inkjet recording or the ink set for inkjet recording.

Ink for inkjet recording, ink set for inkjet recording and inkjet recording method

The invention provides a water-soluble ink capable of forming an image having good color hue and high fastness in various use and environmental conditions, which comprises a coloring composition comprising a disazo dye represented by the following formula 1: A-N&#x2550;N-A-N&#x2550;N-Aand at least one other dye having a specific structure; in formula 1, A, Aand Aeach independently represents an aromatic group which may be substituted or a heterocyclic group which may be substituted, and Aand Aeach is a monovalent group and Ais a divalent group.

Coloring composition and inkjet recording method

An aqueous ink comprising at least two dyes each having at least one ionic hydrophilic group in a molecule thereof, wherein at least one of said at least two dyes includes an azo dye represented by formula (1):  wherein A and B each independently represents a substituted or unsubstituted monovalent aromatic group; or a substituted or unsubstituted monovalent heterocyclic group; Rrepresents a hydrogen atom; a substituted or unsubstituted aromatic group; or a substituted or unsubstituted heterocyclic group; and X represents &#x2014;CR&#x2550; or a nitrogen atom, and when X represents &#x2014;CR&#x2550;, Rrepresents a hydrogen atom or a substituent.

Aqueous ink

A coloring composition such as printing ink for inkjet printing or the like or electrophotographic color toner is provided, which can give a colored image or material excellent in the color hue and fastness, and also provide an inkjet recording method capable of forming an image having good color hue and high fastness to light and active gases in the environment, particularly ozone gas, and which is an inkjet ink comprising an azo dye having a specific structure containing an alkyl chain having 4 to more carbon atoms and not containing an ionic hydrophilic group; an inkjet recording method using the ink; and a color toner composition comprising the above-described azo dye.

Inkjet ink, inkjet recording method and color toner composition

An aqueous ink comprising at least one dye having at least one ionic hydrophilic group within a molecule thereof and represented by the following formula (1): wherein A and B each independently represents a substituted or unsubstituted monovalent aromatic group or a substituted or unsubstituted monovalent heterocyclic group, Rrepresents a substituted or unsubstituted aromatic group excluding an unsubstituted phenyl group or a substituted or unsubstituted heterocyclic group, and Rrepresents a substituent.

Aqueous ink and inkjet recording ink

The present invention provides an ink set, in which in ink jet recording, an ejection stability is enhanced, hues, light resistance and water resistance of an image obtained are made excellent, and image keeping quality under severe conditions is improved, wherein the color ink set comprising a plurality of inks different in hues in order to record on a recording medium, the ink set comprising as a black ink at least a specified coloring agent, which has a &#x3bb;max of 500 nm to 700 nm and a half value width in an absorption spectrum of a dilute solution normalized to an absorbance of 100 nm or more, an ink cartridge containing the same, an ink jet printer carrying them, and an image recording method.

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Minami-ashigara, Japan

Tomohiro Chino