Abstract: In a recording apparatus provided with a plurality of discharging ports for discharging ink, and discharging elements for discharging ink upon application of electrical pulses, the volume of ink droplets discharged from each of the discharging ports is caused to vary due to the properties of each discharging port. This variation results in a conspicuous unevenness in recording. The present invention provides a method for making such recording unevenness due to the properties of each discharging port inconspicuous by varying the volume of ink droplets discharged from each of the plural discharging ports at random. Also, the present invention provides a technique in which the volume of discharging ink droplets is varied at random by use of a specific ink in order to make the recording unevenness inconspicuous.

Abstract: Disclosed herein is a method of forming color images with color inks including a cyan ink on a recording material provided with an ink-receiving layer, which contains basic magnesium carbonate and has a dry coat weight of from 1 to 15 g/m.sup.2, wherein at least one of the cyan ink and one or more another inks to form mixed-color areas with the cyan ink contains a surface active agent, wherein a cyan dye contained in the cyan ink is represented by the general formula ##STR1## wherein M means an alkali metal atom, an ammonium ion or an organic amine residue, m stands for a number of from 1 to 4, and is a number of from 0 to 3.

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 recording solution including a coloring matter and a liquid medium, wherein said recording solution contains a compound obtained by alkylation or acetylation of one or two hydroxyl group(s) of a triol having 4 or more carbon atoms.

Abstract: An ink-jet recording process, recording unit, ink cartridge, and ink-jet recording apparatus employing ink that comprises a triol consisting of carbon atoms, hydrogen atoms and hydroxyl groups, and wherein the triol is selected from the group consisting of the following (a) to (c):(a) a straight-chain triol having 5 carbon atoms;(b) a compound of the formula ##STR1## wherein any three of A.sub.1 to A.sub.5 each represent a hydroxyl group, and the remaining two each represent a hydrogen atom, or a branched triol having 6 carbon atoms; and(c) a triol having at least 7 carbon atoms.

Abstract: Provided is an ink comprising a recording agent and a liquid medium capable of dissolving or dispersing the recording agent, wherein said ink comprises butanetriol or 2-methyl-1,2,3-propanetriol.

Abstract: An ink-jet recording method and apparatus using an aqueous ink that comprises a recording agent and a liquid medium for dissolving or dispersing the recording agent, the ink comprising a compound represented by the general formula (I) or (II): ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of radicals of hydrogen, alkyl or alkoxy having not more than 10 carbons, sulfonic acid or salts thereof, nitro, hydroxyl, carboxyl, and amino or derivatives thereof, and R.sub.1 and R.sub.2 are not simultaneously a hydrogen radical.

Abstract: An ink comprises a recording agent and a liquid medium for dissolving or dispersing the recording agent, the ink comprising a compound represented by the general formula (I) or (II): ##STR1## where R.sub.1 and R.sub.2 are independently selected from the group consisting of radicals of hydrogen, alkyl or alkoxy having not more than 10 carbons, sulfonic acid or salts thereof, nitro, hydroxyl, carboxyl, and amino or derivatives thereof, and R.sub.1 and R.sub.2 are not simultaneously hydrogen radical. The ink is suitable used for ink-jet recording.

Abstract: Provided in an ink comprising a recording agent and a liquid medium capable of dissolving or dispersing the recording agent, wherein said ink comprises a triol selected from the group consisting of the following (a) to (c):(a) a straight-chain triol having 5 carbon atoms;(b) a compound of the formula ##STR1## wherein any three of A.sub.1 to A.sub.5 each represent a hydroxyl group, and the remaining two each represent a hydrogen atom, or a branched triol having 6 carbon atoms; and(c) a triol having 7 or more carbon atoms.

Abstract: An ink jet recording apparatus includes a recording head for ejecting recording liquid to perform recording operation on a recording medium; a laser source, disposed facing to the recording medium, for projecting a laser beam on the recording medium; and a control device responsive to a record signal supplied to the recording head for the recording operation to control the laser source to project the laser beam from the laser source onto the recording medium.

Abstract: Provided is an ink comprising a recording agent and a liquid medium capable of dissolving or dispersing the recording agent, wherein said ink comprises from 0.1% to 10% by weight of a water-soluble dye, from 75% to 95% by weight of water and from 4% to 20% by weight of a mixture of 1,2,6-hexanetriol and an addition polymer of ethylene oxide.

Abstract: A molten Raney copper alloy containing copper and a metal selected from Al, Si and Zn as major components and, if necessary, specific metals as minor components is solidified at a cooling rate of not less than 1.times.10.sup.2 K/sec by a rotary water atomizing process, water or gas atomizing process, single roll process or similar process. The Raney copper alloy thus obtained is leached to obtain a Raney copper catalyst. The resultant catalyst exhibits activity several times higher than that of conventional Raney copper catalysts in the reaction of acrylonitrile with water to give acrylamide.