Konica Corporation

Konica-minolta Holdings, Inc.

Yasuhiko Kawashima

Nobuaki Kagawa

Hirotaka Iijima

Tomomi Yoshizawa

Yasushi Usagawa

Kenichi Ohkubo

Shigeto Hirabayashi

Shinri Tanaka

Teruyuki Fukuda

Shun Takada

Tomoyuki Nakayama

Tamotsu Kojima

Kazuhiro Murai

Katsuhiko Heki

Takaaki Kojima

Hiroshi Okusa

Reiko Yamauchi

An ink for ink-jet recording containing: a colorant; and a solvent mixture containing water and solvent A which is not water, wherein solvent A has a surface tension of 25 to 40 mN/m at 25&#xb0; C.; a viscosity of 1 to 50 mPs&#xb7;s at 25&#xb0; C.; and a vapor pressure of not more than 133 Pa at 25&#xb0; C., a content of solvent A is from not less than 50 to less than 90 weight % based on the total weight of the ink; and a content of water is from not less than 10 to less than 45 weight % based on the total weight of the ink.

Ink-jet ink and ink-jet recording method

An ink for ink-jet recording containing: a colorant; and a set of solvent A and solvent B, provided that solvent B has a larger vapor pressure than solvent A, wherein the set of solvent A and solvent B has a maximum in viscosity by changing a mixing ratio of solvent A to solvent B; and a content of solvent A in weight (A) and a content of solvent B in weight (B) in the ink satisfy the following relationship: 50&#x2266;[A/(A+B)]&#xd7;100&#x2266;95.

An ink jet recording apparatus for jetting ink onto a recording medium having: an ink cartridge; an ink jet recording head; and an ink supply tube which connects the ink cartridge and the ink jet recording head, wherein a driving frequency of the ink jet recording head is 15 kHz or above, and an average surface roughness of an inner surface of the ink supply tube is 200 to 2,000 nm.

Ink jet recording apparatus and ink jet recording method

An ink-jet recording method of forming an image with an ink-jet head, wherein the ink-jet head includes an ink chamber, an electric actuator provided in the ink chamber and an insulating layer covering the electric actuator, including steps of: feeding an ink containing a coloring material and a water-soluble solvent into ink chamber, and applying a driving voltage with a driving frequency of 10 kHz to 55 kHz onto the electric actuator so that the ink is jetted from the ink chamber so as to form the image; wherein the thickness of the insulating layer is 0.1 &mgr;m to 10 &mgr;m, and the concentration of oxygen dissolved in the ink is 4 ppm or less.

Ink-jet recording method and ink-jet recording apparatus

An ink set for ink-jet recording comprising a group of inks exhibiting the same hue and having different color densities and containing a colorant, water-soluble organic solvent and water, wherein among the group of inks, an ink has a largest surface tension &sgr;1 and another ink has a smallest surface tension &sgr;2,and said &sgr;1 and said &sgr;2 satisfy the following conditional formula: &sgr;2/&sgr;1>0.7, and wherein at least one of the inks contains iron ions, magnesium ions, calcium ions such that a total amount of the iron ions, the magnesium ions and the calcium ions is not more than 10 ppm by weight.

Ink set for an ink-jet recording method

A silver halide color photographic light sensitive material is disclosed, comprising a support having thereon a silver halide emulsion layer containing a sensitizing dye represented by formula (I) and a coupler represented by formula (M-I). The photographic material further contains a coupler represented by formula (C-I) or (C-II). ##STR1##

Silver halide color photographic light sensitive material

A silver halide color photographic light sensitive material is disclosed, comprising a support having thereon hydrophilic colloid layers including a silver halide emulsion layer, wherein the silver halide emulsion layer contains photosensitive silver halide grains which have been selenium-sensitized or tellurium sensitized; and at least one of the hydrophilic colloid layers contains an organic dye represented by the following formula. ##STR1##

A process of preparing a purified crown compound is disclosed which comprises the steps of (a) dissolving a crown compound and a salt in an organic solvent to form a solution of a complex salt of a crown compound; (b) filtering the solution to obtain a filtrate; (c) adding water to the filtrate to produce a precipitate; and (d) filtering out the produced precipitate.

Processing for purifying crown compounds

A silver halide photographic emulsion comprising a substantially water-insoluble, spectral sensitizing dye and a styryl compound represented by the following formula, wherein the sensitizing dye is dispersed in an aqueous solution substantially free from an organic solvent and the thus-dispersed dye is introduced into the silver halide emulsion. ##STR1##

Silver halide photographic emulsion

A silver halide color photographic light-sensitive material is disclosed. The light-sensitive material comprises a support having thereon a blue-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer and a red-sensitive silver halide emulsion layer, and at least one of the silver halide emulsion layers contains a silver salt of dye. The light-sensitive material has a raised sharpness, lowered fog and improved storage stability.

Silver halide color photographic light-sensitive material

A silver halide color photographic light-sensitive material having photographic component layers on a support and at least one layer of which contains a silver salt of dye, is disclosed. The material has properties of high sharpness, high speed, less fogging and excellent raw stock stability.

A silver halide photographic light-sensitive material is disclosed. The photographic material contais fine solid particles of a compound represented by a formula of

Silver halide photographic light-sensitive material

The improved silver halide photographic material is provided which contains a compound of the general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkenyl group or a heterocyclic group; Z.sub.1 and Z.sub.2 each represents a non-metallic atomic group necessary for forming a 5- to 7-membered ring; X.sub.1 and X.sub.2 each represents an oxygen atom, a sulfur atom or .dbd.N-R.sub.3 ; R.sub.3 is a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, a heterocyclic group or --OR.sub.4 ; R.sub.4 represents a hydrogen atom, an alkyl group, an aryl group, an alkenyl group or a heterocyclic group; L.sub.1 to L.sub.5 each represents a methine group; and n.sub.1 and n.sub.2 each represents an integer of 0, 1 or 2.

Silver halide photographic materials

There is provided a silver halide photographic light-sensitive material comprising a support and photographic layers containing at least one silver halide emulsion layer thereon. At least one silver halide emulsion layer contains a silver halide grains having a silver chloride content of not less than 90 mol % and silver bromide content of not less than 0.05 mol % and at least one photographic layer contains a specific oxanol dye. The silver halide photographic light-sensitive material is suitable for rapid processing and excellent in image-sharpness.

A silver halide photographic light sensitive material containing a water-soluble oxonol dye is disclosed. The dye is represented by the following Formula I: ##STR1## wherein R.sup.1 and R.sup.2 are each a hydrogen atom, an alkyl group, an aryl group or a alkenyl group; R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each a hydrogen atom, an alkyl group, an aryl group, an alkenyl group or a heterocyclic group provided that at least one of said R.sup.3 , R.sup.4, R.sup.5 and R.sup.6 is a heterocyclic group and R.sup.3 and R.sup.4, and R.sup.5 and R.sup.6 are respectively allowed to bond to form a heterocyclic ring; and the groups represented by said R.sup.1 through R.sup.6 are allowed to be substituted or unsubstituted provided that at least one of said groups a water-solubilizing group or a group having a water solubilizing group; L.sub.1, L.sub.2 and L.sub.3 are each a substituted or unsubstituted methine group; and n is an integer of zero, 1 or 2.

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Iruma, Japan

Yasuhiko Kawashima