Fujifilm Corporation

Fuji Photo Film Company, Limited

Manabu Ogawa

Toshiki Taguchi

Takashi Ozawa

Keiichi Tateishi

Toshiaki Aono

Masanobu Takashima

Naotaka Wachi

Akio Miyamoto

Yoshiharu Yabuki

Toru Harada

Junichi Yamanouchi

Keiichi Suzuki

Yoshihisa Tsukada

Toshiaki Kubo

Jun Arakawa

Nobuhiro Nishita

Hiroshi Iwanaga

Kozo Nagata

Tatsuo Kawabuchi

To provide inks and ink sets for inkjet recording, which have good fastness and good jet-out stability and which give good images with no bleeding trouble, yellow ink, black ink and magenta ink for inkjet printing contain at least two dyes each having an oxidation potential over 1.0 V (vs SCE).

Ink and ink set for inkjet recording

A black ink composition is provided and contains at least two coloring materials, water and additives, wherein the coloring material on the short wave side of the two coloring materials is a water-soluble dye having 3 or more azo groups in one molecule and a naphthalene skeleton, and the additives are selected from the group consisting of a bronzing inhibitor and an ozone resisting improver.

Black ink composition, ink set containing the same, and ink jet recording method

An ink composition includes: a coloring material having an azo group bound to a heterocyclic group; an aqueous medium; and at least one of an acetylene diol and an ethylene oxide adduct of the acetylene diol, wherein an average value of an addition molar number of the at least one of the acetylene diol and the ethylene oxide adduct of the acetylene diol is 0 or more and less than 4.

Ink composition, ink set and recording method

To provide an inkjet black ink having excellent image durability and ink discharge properties and an ink set, the inkjet black ink, which contains a dye having a &#x3bb;max of from 500 nm to 700 nm and a half-band width of 100 nm or more in an absorption spectrum of a diluted solution standardized at an absorbance of 1.0 at the &#x3bb;max, has the change ratio of absorbance at the &#x3bb;max in the visible region, specified in the specification; and the inkjet ink set containing at least two black inks having different densities has the relationship among the at least two black inks, specified in the specification.

Black ink and ink set for inkjet recording

An ink for ink jet recording, which hardly causes blotting of an image even under high humidity conditions while maintaining the advantages as water-based ink (handling properties, stability, producing properties, hue), is provided. Also provided is a method of manufacturing ink for ink jet recording, an ink set for ink jet recording, and an ink jet recording method.

Sheet for ink jet recording, ink for ink jet recording, manufacturing method of ink for ink jet recording, ink set for ink jet recording, and ink jet recording method

An ink composition comprising: at least one dye having an oxidation potential of more positive than 1.0 V dissolved or dispersed in an aqueous medium; and a surface active agent in an amount of from 0.05 to 50 g/l. The ink composition having the aforesaid constitution exhibits a high ejection stability and can provide an image having assured hue and an excellent weathering resistance and being free of defects in water resistance and image quality.

Ink composition and ink jet recording method

An inkjet recording ink including an aqueous medium having dissolved therein a phthalocyanine dye, wherein the phthalocyanine dye is a water-soluble dye having an oxidation potential more positive than 1.0 V (vs SCE) and the ink includes a water-miscible organic solvent having a vapor pressure of 2,000 Pa or less at 20&#xb0; C.; and an inkjet recording method using the ink.

Inkjet recording ink and method of inkjet recording

An ink for ink jet recording having a phthalocyanine dye dissolved and/or dispersed in an aqueous medium, characterized in that the aforementioned phthalocyanine dye is a water-soluble dye having an oxidation potential of more positive than 1.0 and the conductivity of the aforementioned ink is from not 0.01 S/m to not greater than 10 S/m. A process for the production of the aforementioned ink for ink jet recording which includes a step of applying ultrasonic vibration and/or a step of filtering using a filter having pores of an effective diameter of not greater than 1 &#x3bc;m and defoaming the ink and an ink jet recording process using these inks. In accordance with such a constitution, an ink for ink jet recording and an ink jet recording process can be provided which exhibit a high ejection stability, give an image having an excellent hue and preservability (weathering resistance, water resistance) and provide an image with a high quality.

Ink for ink jet recording, process for the production of ink and ink jet recording process

An ink composition comprising: a coloring agent having an oxidation potential of more electropositive than 1.0V (vs SCE); a water; a guanidine compound; and a surfactant, the ink composition to be used in inkjet recording and an inkjet recording method with the use of the ink composition.

Ink composition and inkjet recording method

An inkjet recording ink including an aqueous medium having dissolved or dispersed therein a magenta dye selected from azo dyes, wherein the magenta dye is a dye having an oxidation potential more positive than 1.0 V (vs SCE) and at the same time, a water-miscible organic solvent having a vapor pressure of 2,000 Pa or less at 20&#xb0; C. is contained; and an inkjet recording method using the ink. By virtue of such a constitution, an inkjet recording ink and an inkjet recording method are provided, which can ensure high ejection stability, good color hue of the obtained image, no drying of the ink at the ink jet head, excellent fastness to light and water, image quality free from defective such as fineline bleeding under high-humidity condition, and good preservability of the image under severe conditions, and furthermore can ensure high storability and high ejection stability even after aging for a long time or under severe conditions.

Ink for inkjet recording and method for inkjet recording

An ink set where constituent inks all are an ink containing at least one dye having an oxidation potential more positive than 1.0 V (vs SCE), particularly where the ratio k1/k2 of the fading rate constant (k1) of an image drawn by using the ink alone to the fading rate constant (k2) of a mixed color image drawn by using all constituent inks constituting the ink set in equivalent amounts with the same density measurement light as in the measurement of k1 is 0.7 to 1.3 in all inks. According the present invention, an inkjet ink set capable of giving an image having good image quality and excellent image fastness regardless of the color of image, such as aging stability, light fastness and water resistance, and an inkjet image recording method using the ink set are provided.

Ink set and inkjet recording method

An ink set comprising: at least two kinds of inks, each of the at least two kinds of inks having a common hue and different densities, and containing an aqueous medium and a dye, wherein each of the at least two kinds of inks has a corresponding discoloration velocity constant (k) for an image printed with each one of the at least two kinds of inks, and a ratio defined by a minimum value (k) selected from among said corresponding constants divided by a maximum value (k) selected from among the corresponding constants, is within a range of 0.7 to 1.0.

Ink set and ink jet recording method

An ink for ink jet recording including a magenta dye selected from azo dyes dissolved or dispersed in an aqueous medium, characterized in that said magenta dye is a dye having an absorption maximum in a spectral range of from 500 to 580 nm in said aqueous medium and a more positive oxidation potential than 1.0V (vs SCE), particularly with the aforesaid ink for ink jet recording wherein the azo dye has a specific structure having a 5-membered heterocyclic ring and a 4-amino-6-membered heterocyclic ring connected to the azo group.

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

An inkjet ink comprising a dye, water, a water-soluble organic solvent and a betaine compound, wherein the total weight of inorganic ions in the ink is 2 wt % or less based on the ink.

Inkjet ink, production method of inkjet ink, inkjet ink set and inkjet recording method

An inkjet ink set comprising at least two inks, wherein at least one ink contains a betaine compound and at least one other ink contains a nonionic surfactant.

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Shizuoka, Japan

Manabu Ogawa