Abstract: A method for manufacturing a pigment dispersed liquid, comprising at least: Step A of introducing a hydrophilic dispersibility-imparting group directly and/or via another atomic group to the surface of pigment particles; Step B of dispersing the pigment obtained in Step A in an aqueous medium; and Step C of conducting refining treatment of the dispersed liquid obtained in Step B.

Abstract: A recording medium having an ink receiving layer comprising a porous pigment and a binder, wherein the ink receiving layer contains at least one benzotriazole compound represented by formula (I): wherein R represents hydrogen atom or an alkyl group; X represents a hydrogen atom, a sodium atom, a potassium atom or a primary, secondary or tertiary amino group. Also disclosed is an aqueous ink composition containing a compound of formula (I) and an ink jet recording method using the recording medium or the aqueous ink composition.

Abstract: Provided are an ink jet recording ink (IJ ink), an ink jet recording ink set (IJ ink set) and a recording method, having excellent dispersion stability and ejection stability and being capable of providing images which is free from bleeding and which is excellent in color development property and rubbing resistance. An IJ ink and an IJ ink set having long-term storage stability are provided. Also provided are recorded matter having excellent color development property and rubbing resistance, and an ink jet recording apparatus capable of providing the same.

Abstract: The invention provides an ink set for ink jet recording which gives high color density with respect to plain paper and exclusive paper and satisfactory color reproducibility and which has excellent ejection stability and storage stability.

Abstract: An ink composition for ink jet recording is provided which comprises at least a pigment, a 1,2-alkanediol, glycerin, a polyhydric alcohol derivative and/or an acetylene glycol surfactant, a water-soluble organic solvent, and water, the pigment having been surface treated to render the pigment dispersible and/or dissolvable in water without any dispersant, the 1,2-alkanediol being at least one member selected from the group consisting of 1,2-butanediol, 1,2-pentanediol, and 1,2-hexanediol, the ink composition having a surface tension of not more than 40 mNm−1 at 20° C. This ink composition enables ink jet recording which can provide good print quality and can realize continuous printing.

Abstract: Disclosed are an aqueous pigment dispersion and an ink composition which can realize high print density. The aqueous pigment dispersion comprises at least water and a surface-modified carbon black, the surface-modified carbon black being dispersible and/or dissolvable in water without any dispersant and having a hydrophilic functional group content/specific surface area value of 5 to 30 &mgr;mol/m2.

Abstract: A method for manufacturing a pigment dispersed liquid, comprising at least:

Abstract: A recording medium having an ink receiving layer comprising a porous pigment and a binder, wherein the ink receiving layer contains at least one benzotriazole compound represented by formula (I): 1

Abstract: A recording medium is provided that exhibits both outstanding ink absorbency and outstanding light resistance of images, and an image forming method and a recorded matter using such recording medium are also provided. The recording medium in the present invention comprises a supporting body and an ink receiving layer deployed on that supporting body, and tho ink receiving layer contains a compound expressed by the general formula (I) below, and having a solubility in water of 0.01 to 5%.

Abstract: An ink jet recording method which can produce a good image on both plain papers and specialty recording media for ink jet recording, and an ink jet recording apparatus for the ink jet recording method are disclosed. The ink jet recording method comprises: providing a black ink composition comprising a pigment as a colorant and a black ink composition comprising a dye as a colorant; and, when the recording medium comprises a gloss layer and/or an ink-receptive layer, printing only the black ink composition comprising a dye as the colorant on the recording medium, and, when the recording medium is plain paper, both the black ink composition comprising a pigment as the colorant and the black ink composition comprising a dye as the colorant are printed. According to this recording method, in the case of printing on plain paper, the density of black can be enhanced, while in the case of printing on a specialty paper for ink jet recording, an image having high chroma and good reproduction range can be produced.

Abstract: A yellow ink composition and a magenta ink composition are provided which have good properties satisfying requirements for a color ink jet recording ink, particularly a requirement that the color ink composition is less likely to cause clogging of nozzles, and can realize a printed image having excellent tone, waterfastness, storage stability, and lightfastness. Further, a color ink set comprising the above ink compositions in combination with a particular cyan ink composition and a particular black ink composition are also provided. A yellow ink composition comprising a dye represented by the following formula (XI) in combination with a dye represented by the following formula (XII) is a fundamental color ink composition: ##STR1## wherein R.sup.101 and R.sup.102 represent phenyl or naphthyl substituted by a hydroxyl group, --SO.sub.3 M, or --COOM.

Abstract: A color ink jet recording method is disclosed which can provide a high-quality monochrome print, does not cause bleeding derived from intermixing of a black ink with color inks and can equalize the dot diameter of four color ink dots, offer a high drying rate and provide a sharp and vivid color image. The color ink jet recording method includes a step of forming a dot unit of a black ink consisting of plural of ink droplets, wherein color inks having a surface tension of less than 40 dyn/cm at 20.degree. C. and black ink having a surface tension of not less than 40 dyn/cm are used.

Abstract: A disazo dye composition comprising at least a disazo dye represented by the formula (I) and a disazo dye represented by the formula (II): ##STR1## (wherein X and Y indicate an alkoxy group having 1 to 4 carbon atoms, and M indicates hydrogen or a cation selected from the group consisting of, alkaline metal, NH.sub.4, alkyl-substituted ammonium, alkanolammonium, morpholinium and piperidinium), wherein, when the disazo dye composition is analyzed by liquid chromatography, the area ratio of the peak area (Sp) of the disazo dye represented by the formula (I) to the peak area (Sc) of the disazo dye represented by the formula (II), that is Sp:Sc is from 1:0.4 to 1:2.4. This disazo dye composition provides a high quality image, rapid ink fixing and the like even on the plain paper.

Abstract: An ink composition for ink jet recording, ink composition set, ink cartridge, ink jet recording apparatus and ink jet recording process is disclosed, which can give a highly colored and high quality recorded image without causing color bleeding and feathering with a high reliability in recovery from clogging in ink jet recording. The ink composition comprises (A) a colorant, (B) an alginate, (C) a liquid wetting agent, (D) a penetrant, and (E) water. As the foregoing liquid wetting agent component (C) there is contained glycerin in an amount of not less than 8% by weight based on the weight of the composition.

Abstract: An ink composition capable of offering a combination of a high-quality image with a waterfast image is provided. More specifically, an ink composition is provided which, by virtue of a combination of particular dyes, can faithfully reproduce black color, realize a high-quality image (a sharp image having a high optical density and free from bleed) also on plain paper and, at the same time, offer rapid ink fixation and waterfastness and lightfastness of the printed image. Dyes represented by the following formula (I) are used as a fundamental dye and further combined with a plurality of dyes to constitute the ink composition: ##STR1## wherein R.sup.1 represents --PO(OM).sub.2 or --COOM, X and Y each independently represent an alkoxy and M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine.

Abstract: A color ink jet recording method is provided which can provide a color image having a higher quality and attain a print quality of a black ink comparable to that of the conventional monochrome print. A color ink jet recording method for printing on a recording medium, comprising the steps of: when a portion to be black is in contact with a color portion in a color image to be formed, printing, first, at least one color ink on a portion which is a part of the portion to be black and is in contact with the color portion on the recording medium, then printing a black ink on a portion which is to be black and is partially printed with the color ink according to the previous step, wherein a plural of color inks having a surface tension at 20.degree. C. of less than 40 dyn/cm and a black ink having a surface tension at 20.degree. C. of 40 dyn/cm or more.

Abstract: The present invention relates to a chromone derivative and an aldose reductase inhibitor comprising said compound as efective component, which is represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent a lower alkyl group, etc., R.sub.3 represents an oxygen atom, a sulfur atom, etc., R.sub.7 represents a phenyl group substituted or not substituted, etc., and R represents a hydrogen atom or a lower alkoxy group. The present compounds exhibit superior inhititory action on aldose reductase and are useful for the treatment of various complications of diseases in diabetes, such as cataract, retinopathy, keratopathy, nephropathy, and neuropathy.

Abstract: An ink composition for ink jet recording is provided which can satisfy property requirements of quality of print, drying property of print, clogging resistance, water resistance, storage stability, and nonattacking on members constituting an ink passage, such as a printing head. The ink composition for ink jet recording comprises a dye represented by the following formula (I), glycerin, pyrrolidone, a monohydric lower alcohol, a tri(hydroxyalkyl)amine, and water: ##STR1## wherein R.sup.1 represents phenyl or naphthyl substituted by a group selected from hydroxyl, --NH.sub.2, --SO.sub.3 M and --COOM, R.sup.2 represents carboxyalkyl, alkoxyalkyl, phenyl, or alkanoyl, R.sup.3, R.sup.4, and R.sup.5 represent hydrogen or --SO.sub.3 M.

Abstract: The present invention relates to a chromone derivative and an aldose reductase inhibitor comprising said compound as efective component, which is represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent a lower alkyl group, etc., R.sub.3 represents an oxygen atom, a sulfur atom, etc., R.sub.7 represents a phenyl group substituted or not substituted, etc., and R represents a hydrogen atom or a lower alkoxy group. The present compounds exhibit superior inhititory action on aldose reductase and are useful for the treatment of various complications of diseases in diabetes, such as cataract, retinopathy, keratopathy, nephropathy, and neuropathy.

Abstract: An ink composition is provided which enables high-quality recording on plain paper and can record an image having excellent water resistance. The ink composition comprises a dye represented by the following formula (I): ##STR1## wherein M represents an unsubstituted or substituted ammonium, R.sup.1 represents COOM, R.sup.2 represents --P(=O)n--(OM).sub.2, where n is 0 or 1, R.sup.3 represents SO.sub.3 M, R.sup.4 and R.sup.5 independently represent H, an alkyl group, or an alkoxyl group, R.sup.6 represents H, a phenyl group which may be substituted, an alkylcarbonyl group, or an alkyl group which may be substituted with a hydroxyl or alkoxyl group, and m is 0 or 1.