Abstract: The present invention relates to a water-based ink including a pigment, a water-insoluble polymer, an organic solvent and a surfactant, in which the organic solvent includes at least a glycol ether which has a viscosity of from 2.0 to 7.0 mPa·s and a vapor pressure from 0.01 to 7.0 hPa as measured at 20° C., and a content of a glycol ether having a viscosity of not less than 6.0 mPa·s as measured at 20° C. as a component of the glycol ether in the water-based ink is from 0 to 5% by mass; the surfactant includes a silicone-based surfactant and a content of the silicone-based surfactant in the water-based ink is from 0.005 to 0.

Abstract: The present invention relates to [1] an ink-jet printing method including a printing step of ejecting a water-based ink onto a surface of a printing medium to print characters or images thereon, in which the water-based ink includes a pigment (A), an organic solvent (B), a surfactant (C) and water; the organic solvent (B) includes at least a glycol ether (b-1), and the glycol ether has a viscosity of from 2.0 to 5.5 mPa·s as measured at 20° C. and a vapor pressure of from 0.03 to 6.0 hPa as measured at 20° C.; a content of a high-boiling organic solvent having a boiling point of not lower than 250° C. in the water-based ink is not more than 5% by mass; and a printing speed upon printing the characters or images on the printing medium is not less than 70 m/min in terms of a transportation speed of the printing medium, and [2] a water-based ink used in the inkjet printing method.

Abstract: The present invention relates to [1] an ink-jet printing method including a printing step of ejecting a water-based ink onto a surface of a printing medium to print characters or images thereon, in which the water-based ink includes a pigment (A), a polypropylene glycol (B), an organic solvent (C), a surfactant (D) and water; the polypropylene glycol (B) includes a polypropylene glycol (b-1) having a polymerization degree of not less than 5 and not more than 30, and a content of the polypropylene glycol (b-1) in the water-based ink is not less than 0.5% by mass and not more than 2% by mass; the organic solvent (C) includes at least a glycol ether, and the glycol ether has a viscosity of not more than 7.5 mPa·s as measured at 20° C.; a content of a high-boiling organic solvent having a boiling point of not lower than 250° C.

Abstract: The present invention relates to a water-based ink that exhibits excellent ejection properties, and can be prevented from suffering from reduction in a dot size of the ink during a drying step thereof even when printed on a low-water absorbing recording medium, and is capable of obtaining printed characters or images having excellent uniformity, as well as an ink-jet printing method using the water-based ink. The water-based ink includes a pigment, a water-insoluble polymer, an acetylene glycol-based nonionic surfactant (A) having HLB of not less than 0 and not more than 5, a nonionic surfactant (B) having HLB of not less than 6 and not more than 20, a polyether-modified silicone (C) having a kinematic viscosity of not less than 30 mm2/s and not more than 190 mm2/s as measured at 25° C. and an organic solvent (D), in which a weighted mean value of a boiling point of the organic solvent (D) is not lower than 150° C. and not higher than 230° C.

Abstract: The present invention provides an ink-jet printing method using a water-based ink for ink-jet printing which is excellent in quick-drying fixing properties and long-term fixing properties when printing characters or images on a low-water absorbing recording medium, as well as ejection stability. The present invention relates to [1] an ink-jet printing method of printing characters or images on a recording medium using a water-based ink for ink-jet printing, in which the recording medium has a water absorption of not more than 10 g/m2 and not less than 0 g/m2 as measured in a pure water contact time of 100 milliseconds; the water-based ink includes a pigment (A), resin particles (B), a polypropylene glycol (X) and water; and the resin particles (B) are produced by emulsion polymerization method; and [2] the aforementioned water-based ink for ink-jet printing.

Abstract: The present invention provides a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.

Abstract: The present invention provides a water-based ink for ink-jet printing which is excellent in ejection stability and storage stability, in particular, excellent in quick-drying fixing properties and image uniformity when printing characters or images on a low-water absorbing recording medium, and an image forming method using the water-based ink. The present invention relates to [1] a water-based ink for ink-jet printing, including a pigment, a water-insoluble polymer, an organic solvent (C) and water, in which the organic solvent (C) includes diethylene glycol isopropyl ether (DEGPE) and an organic solvent (c2) having a 1-octanol/water partition coefficient that is smaller than that of DEGPE; a total content of the pigment, the water-insoluble polymer and DEGPE in the water-based ink is not less than 5.

Abstract: The present invention provides [1] a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending (A) a raw material organic pigment containing an oxygen atom and a nitrogen atom bonded to a hydrogen atom in a molecule thereof, (B) a water-soluble inorganic salt, (C) a water-soluble organic solvent, (D) water and (E) a water-soluble basic compound with each other, in which the water (D) is blended in an amount of not less than 0.6 part by mass and not more than 7.

Abstract: The present invention provides a water-based ink for ink-jet printing which is excellent in ejection stability and storage stability, in particular, excellent in quick-drying fixing properties and image uniformity when printing characters or images on a low-water absorbing recording medium, and an image forming method using the water-based ink. The present invention relates to [1] a water-based ink for ink-jet printing, including a pigment, a water-insoluble polymer, an organic solvent (C) and water, in which the organic solvent (C) includes diethylene glycol isopropyl ether (DEGPE) and an organic solvent (c2) having a 1-octanol/water partition coefficient that is smaller than that of DEGPE; a total content of the pigment, the water-insoluble polymer and DEGPE in the water-based ink is not less than 5.

Abstract: A data holding circuit includes: a latch circuit having a first terminal and a second terminal, a logical value held at the first terminal being changed according to a value to be held by the data holding circuit, and the second terminal holding an inverted logical value of the logical value held at the first terminal; and a storing circuit which stores the logical values held at the first terminal and the second terminal in response to a write signal, and sets the logical values held at the first terminal and the second terminal to the stored logical values in response to a read signal, wherein the storing circuit includes two Magnetic Tunnel Junction elements which are connected in series between the first terminal and the second terminal and in reverse directions to each other.

Abstract: The present invention provides [1] a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending (A) a raw material organic pigment containing an oxygen atom and a nitrogen atom bonded to a hydrogen atom in a molecule thereof, (B) a water-soluble inorganic salt, (C) a water-soluble organic solvent, (D) water and (E) a water-soluble basic compound with each other, in which the water (D) is blended in an amount of not less than 0.6 part by mass and not more than 7.

Abstract: The present invention provides a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.

Abstract: A data holding circuit includes: a latch circuit having a first terminal and a second terminal, a logical value held at the first terminal being changed according to a value to be held by the data holding circuit, and the second terminal holding an inverted logical value of the logical value held at the first terminal; and a storing circuit which stores the logical values held at the first terminal and the second terminal in response to a write signal, and sets the logical values held at the first terminal and the second terminal to the stored logical values in response to a read signal, wherein the storing circuit includes two Magnetic Tunnel Junction elements which are connected in series between the first terminal and the second terminal and in reverse directions to each other.

Abstract: The present invention relates to a water dispersion for ink-jet printing including two kinds of carbon blacks (a) and (b) and a water-insoluble polymer which adheres to a surface of the respective carbon blacks (a) and (b), wherein the carbon black (a) has an acid group content of from 0 to 200 ?mol/g and the carbon black (b) has an acid group content of more than 200 ?mol/g but not more than 1000 ?mol/g, and a difference between acid group contents of the carbon blacks (a) and (b) is from 100 to 1000 ?mol/g, and a water-based ink for ink-jet printing which contains the water dispersion. The water-based ink is excellent in image density, fixing property, high lighter fastness, image uniformity, ejection reliability and storage stability.

Abstract: A water dispersion containing colorant-containing water-insoluble vinyl polymer particles, and a water-based ink containing the water dispersion. The water-insoluble vinyl polymer contains constitutional units of formulae (1) and (2): where R1 is a hydrogen atom or a methyl group; and R2 is a substituted or unsubstituted arylalkyl group or a substituted or unsubstituted aryl group; and where R3 is a hydrogen atom or a methyl group; R4O is an oxypropylene group; R5O is an oxyalkylene group having 2 or 4 carbon atoms; R6 is a hydrogen atom, an alkyl group or an unsubstituted or alkyl-substituted phenyl group; x is a number from 1 to 30; and y is a number from 0 to 30, and a weight ratio of the constitutional units of formula (1) to formula (2) in the polymer ranges from 1/2 to 10/1.

Abstract: The present invention relates to a water dispersion for ink-jet printing including two kinds of carbon blacks (a) and (b) and a water-insoluble polymer which adheres to a surface of the respective carbon blacks (a) and (b), wherein the carbon black (a) has an acid group content of from 0 to 200 ?mol/g and the carbon black (b) has an acid group content of more than 200 ?mol/g but not more than 1000 ?mol/g, and a difference between acid group contents of the carbon blacks (a) and (b) is from 100 to 1000 ?mol/g, and a water-based ink for ink-jet printing which contains the water dispersion. The water-based ink is excellent in image density, fixing property, high lighter fastness, image uniformity, ejection reliability and storage stability.

Abstract: The invention provides a process for producing a water dispersion for ink jet recording,which comprises the following steps 1 and 2: (Step 1) a step of obtaining a pigment treated with (a) a water-insoluble vinyl polymer particles by making a pigment and (a) a water-insoluble vinyl polymer particles present in an aqueous solvent and then removing the solvent; and (Step 2) a step of obtaining a water dispersion of a pigment-containing water-insoluble vinyl polymer particles by dispersing a mixture comprising the water-insoluble vinyl polymer particle (a)—treated pigment obtained in step 1, an organic solvent, (b) a water-insoluble vinyl polymer and water and then removing the organic solvent.

Abstract: There are provided a water dispersion containing colorant-containing water-insoluble vinyl polymer particles, as well as a water-based ink containing the water dispersion. The water-insoluble vinyl polymer is a polymer containing constitutional units represented by the formulae (1) and (2): wherein R1 is a hydrogen atom or a methyl group; and R2 is a substituted or unsubstituted arylalkyl group or a substituted or unsubstituted aryl group; and wherein R3 is a hydrogen atom or a methyl group; R4O is an oxypropylene group; R5O is an oxyalkylene group having 2 or 4 carbon atoms; R6 is a hydrogen atom, an alkyl group or an unsubstituted or alkyl-substituted phenyl group; x is a number from 1 to 30; and y is a number from 0 to 30, with the proviso that a weight ratio of the constitutional units of formula (1) to formula (2) in the polymer ranges from 1/2 to 10/1.

Abstract: The invention provides a process for producing a water dispersion for ink jet recording,which comprises the following steps 1 and 2: (Step 1) a step of obtaining a pigment treated with (a) a water-insoluble vinyl polymer particles by making a pigment and (a) a water-insoluble vinyl polymer particles present in an aqueous solvent and then removing the solvent; and (Step 2) a step of obtaining a water dispersion of a pigment-containing water-insoluble vinyl polymer particles by dispersing a mixture comprising the water-insoluble vinyl polymer particle (a)-treated pigment obtained in step 1, an organic solvent, (b) a water-insoluble vinyl polymer and water and then removing the organic solvent.