Abstract: A liquid jet printing head includes a discharging outlet for discharging printing liquid, an energy generating element capable of generating an energy for discharging said liquid through said discharging outlet and a discharging outlet face at which said discharging outlet is arranged, characterized in that said discharging outlet face has a water repellent material layer comprising fine particles of an inorganic material distributed in a water repellent resin in a desired distribution state. A liquid jet printing apparatus provided with said liquid jet printing head.

Abstract: A liquid jet printing head includes a discharging outlet for discharging printing liquid, an energy generating element capable of generating an energy for discharging the liquid through the discharging outlet and a discharging outlet face at which the discharging outlet is arranged, characterized in that the discharging outlet face has a water repellent material layer with fine particles of an inorganic material distributed in a water repellent resin in a desired distribution state. A liquid jet printing apparatus is provided with the liquid jet printing head. The liquid jet printing head enables one to always perform stable ink discharging thereby providing high quality printed images.

Abstract: An ink jet recording head is formed by forming a solid layer of removable material on a substrate to enable formation of flow paths and liquid chambers, coating a surface of the solid layer with a resin and removing the solid layer. The coating is performed by providing a mold, part of which is in contact with the solid layer, and coating the surface of the solid layer excluding at least a part of the surface. Further, bonding wires connecting the head to a circuit board are at least partly coated with the resin.

Abstract: An abrasive composition comprising abrasive grains of an inorganic material dispersed in a dispersion medium, characterized in that said dispersion medium contains an electrolytic water. A process for polishing an object using said abrasive composition.The abrasive composition enables to attain a high quality polish-finished surface at an improved polishing efficiency.

Abstract: A monoazo compound of the general formula ##STR1## wherein; Y is hydrogen, methyl, methoxy, acetylamino, or nitro, or Y, cojointly with the carbon atom located in the benzene ring B at the 3-position with respect to the N.dbd.N group, may form a benzene ring; X is acetyl, benzoyl, p-toluenesulfonyl, or 4-chloro-6-hydroxy-1,3,5-triazine-2-yl; and M.sup.1, M.sup.2 and M.sup.3 each are a base selected from alkali metal atom, ammonium cation and amine salt cation. A recording liquid comprising a coloring matter, which is an image-forming component, and a liquid medium for dissolving or dispersing the coloring matter, said recording liquid being characterized by containing as coloring matter the above-mentioned monoazo compound.

Abstract: An ink jet recording head comprises an ink path communicating with an orifice for discharging an ink, and energy-generating means for generating energy to be utilized for discharging the ink from the orifice, provided along the ink path, wherein a base member provided with the energy-generating means and a resin member provided with a recess for forming the ink path are bonded to each other while keeping the recess inside, thereby forming the ink path, and wherein a shearing bonding force between the resin member and the base member is larger than a stress generated due to a difference in coefficient of thermal expansion between the resin member and the base member.

Abstract: A process for preparing an ink jet recording head, comprises: the step for providing a first material which is volatilized by imparting an active energy in a layer on a substrate; the step for patterning the layer of said first material by imparting said active energy to the layer of said first material corresponding to the pattern of ink channels communicated to the discharging outlet which discharges ink; the step for providing a second material so as to cover the layer of said material shaped in the pattern formed by said step; and the step for forming said ink channels by volatilization of the layer of said pattern shaped first material coated with said second material by imparting said active energy.

Abstract: An ink-jet method and apparatus employing an ink comprising a dye and a liquid medium for dissolving or dispersing a dye, wherein the liquid medium comprises an alkyl alcohol having 2 to 4 carbon atoms, in which at least one of the hydrogen atoms is substituted by a halogen atom.

Abstract: An ink comprising a dye and a liquid medium for dissolving or dispersing a dye, wherein the liquid medium comprises an alkyl alcohol having 2 to 4 carbon atoms, in which at least one of the hydrogen atoms is substituted by a halogen atom.

Abstract: A method for purifying a dye solution is provided. The method comprises the steps of dissolving an impure dye in a solvent. A flocculant is then added to the dye solution in order to flocculate the imprity so that the impurity may then be removed from the solution. A method for producing on ink utilizing the purification procedure is also provided.

Abstract: A naphthalene trisazo compound represented by the general formula (I) or (II): ##STR1## wherein A and B each represents a substituted or unsubstituted benzene or naphthalene ring; m represents zero or 1; and M represents an alkali metal atom, ammonium or H.Am (wherein Am represents an amine); or ##STR2## wherein X represents a hydrogen atom, a lower alkyl group, a phenyl group or a phenyl group substituted by --SO.sub.3 M; m represents zero or 1; M represents an alkali metal atom, ammonium or H.Am (wherein Am represents an amine); A, B and C each represents a substituted or an unsubstituted benzene or naphthalene ring, provided that B and C do not represent a naphthalene ring at the same time. A recording liquid containing these compounds is suitable for use in an ink-jet recording system.

Abstract: A liquid composition is provided which contains a water-soluble dye and a solvent, wherein said liquid composition has a lyophobic colloid concentration of 13 ppm or less. An ink-jet recording method is also provided which employs an ink comprising the liquid composition.

Abstract: A black recording liquid suitable for use in ink-jet recording or as an ink for writing instruments comprises at least two water-soluble dyes and a liquid medium. Each of the dyes satisfies the condition defined by the following expression [I], and a mixture of these dyes satisfies the condition defined by the following expression [II]. ##EQU1## In these expressions, a* and b* are chromaticness indices defined in the CIE 1976 (L*, a*, b*) space, i indicates the ith dye of the dyes used together, and n is an integer of 2 or more.

Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, an a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.

Abstract: A liquid composition is provided which contains a water-soluble dye and a solvent, and the liquid composition has a total concentration of divalent and higher valent metals at 20 ppm or less, and a magnesium concentration is preferably 4 ppm or less. An ink-jet recording method employing the ink comprising the above-mentioned liquid composition is also provided.

Abstract: A naphthalenedisazoic dye represented by general formula (I); ##STR1## wherein Q represents ##STR2## or a naphthalene group substituted by --SO.sub.3 M; R represents a methyl group, a methoxy group, an ethoxy group; X represents a hydrogen atom, a phenyl group substituted by --SO.sub.3 M; m represents 1 or 2; n represents 1 when X represents a hydrogen atom and n represents zero when X represents a phenyl group substituted by --SO.sub.3 M, wherein X represents a hydrogen atom and m represents 1 when Q represents a naphthalene group substituted by --SO.sub.3 M; and M represents an alkali metal atom, an ammonium, or H.A (wherein A represents an amine), and a recording liquid containing the dye. The recording liquid is suitable for use in an ink-jet recording system.

Abstract: A liquid composition comprising a water-soluble dye is provided. The composition contains iron and silicon at a concentration of 9 ppm or less. A method for recording with liquid droplets formed from the liquid composition is also provided. Further, a water soluble dye for the liquid composition is provided, the dye containing iron and silicon at a total concentration of 250 ppm or less.

Abstract: A recording liquid mainly comprises a recording agent as an image-forming component and a liquid medium containing at least water and a glycol for dissolving or dispersing the recording agent, characterized in that the recording agent contains at least one of dyes represented by the following general formula (A): ##STR1## wherein M represents one element selected from H, Na, Li and K, and 55 mole % or more of total M given in the general formula (A) is Na, Li or K. The recording liquid may additionally contain a water-soluble organic solvent.

Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, and a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.

Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, and a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.