Kao Corporation

Think Laboratory Co., Ltd.

Ryuma Mizushima

Yasufumi Ueda

Takehiro Tsutsumi

Isao Tsuru

Yuta Matsumoto

Tatsuo Shigeta

Koji Azuma

Kazuki Watanabe

Takahiro Sato

Hirotaka Takeno

Hiroyuki Yoshida

Tetsuya Eguchi

Yuki Ozaki

Takuto Matsuzono

Yusuke Shimizu

Atsushi Suzuki

Yuki Wakabayashi

Nobuyuki Takizawa

Nobushige Tanaka

Hiroshi Yashima

Toshiya Iwasaki

Makoto Sakakibara

Kenji Kaida

Shinichi Yabe

Shiro Kawahito

Katsuhiko Inada

Shinichiro Yamaguchi

Shuji Maruyama

Shigeki Takahashi

The present invention relates to an aqueous gravure ink containing a pigment, a water-soluble organic solvent, a surfactant and water, in which the water-soluble organic solvent contains a glycol ether having a boiling point of 100 to 260° C.; the surfactant contains a silicone-based surfactant containing a specific constitutional unit; a content of the water-soluble organic solvent in the ink is 1 to 10% by mass; and a content of water in the ink is 50 to 80% by mass. This ink exhibits a less burden on the environments, and is excellent in optical density and drying properties.

Aqueous gravure printing ink

The present invention relates to an aqueous gravure ink containing a pigment, a polymer, a water-soluble organic solvent, a surfactant and water, in which the water-soluble organic solvent contains a glycol ether having a boiling point of from 100 to 260&#xb0; C., and a content of the glycol ether in the ink is from 1 to 10% by mass; a total content of the water-soluble organic solvent in the ink is not more than 15% by mass; the surfactant contains an acetylene glycol-based surfactant; and a content of water in the ink is from 50 to 70% by mass.

Aqueous gravure ink

The present invention relates to a gravure printing method of conducting printing on a printing substrate with an aqueous ink reserved in an ink pan using a furnisher roll, a gravure roll, a doctor blade and a nip roll, in which the aqueous ink contains a pigment, a polymer, an organic solvent, a surfactant and water; a content of organic solvent components of the organic solvent which have a boiling point of 100 to 260&#xb0; C. in the aqueous ink is not less than 0.3% by mass and not more than 12% by mass; an average particle size of particles of the pigment is from 120 to 350 nm; and an arithmetic mean roughness (Ra) of a plate surface of the gravure roll is from 10 to 140 nm. According to the present invention, it is possible to improve transfer properties of the ink to the printing substrate such as a resin film, etc., and suppress fogging on the plate surface.

Gravure printing method

The present invention relates to an ink-jet printing method including the step of ejecting a water-based ink containing pigment-containing water-insoluble polymer particles and water onto a printing medium to print characters or images on the printing medium, in which the pigment is at least one pigment selected from the group consisting of C.I. Pigment Red 177, C.I. Pigment Red 254, C.I. Pigment Green 7, C.I. Pigment Green 36 and C.I. Pigment Blue 15:6; the water-insoluble polymer constituting the particles contains a constitutional unit derived from an ionic monomer, a constitutional unit derived from a hydrophobic monomer and a constitutional unit derived from a monomer capable of forming a graft chain; and the printing medium is a low-water absorbing printing medium.

Inkjet recording method

The present invention relates to [1] a process for producing a printed material, including step 1 of subjecting an image-bearing surface of a printed recording medium 1' on which characters or images are formed by analog printing to discharge treatment under specific conditions to obtain a printed recording medium 1, and step 2 of further forming characters or images on the image-bearing surface of the printed recording medium 1 by ink-jet printing using a water-based ink to obtain the printed material, [2] an ink-jet printing method including the step of ejecting a water-based ink onto a printed recording medium 1 by an ink-jetting method to form characters or images thereon, in which the printed recording medium 1 has an image-bearing surface on which characters or images are formed by analog printing, and the image-bearing surface is subjected to discharge treatment under the specific conditions, [3] a recording medium for ink-jet printing, including an image-bearing surface on which characters or images are formed by analog printing and which is subjected to discharge treatment, in which a surface free energy of the image-bearing surface after being subjected to the discharge treatment is not less than 30 mN/m, and [4] a printed material including an image-bearing surface on which characters or images are formed by analog printing and then on at least a part of which characters or images are further formed by ink-jet printing using a water-based ink, in which the image-bearing surface after forming the characters or images thereon by the analog printing is subjected to discharge treatment, and a surface free energy of the image-bearing surface after being subjected to the discharge treatment is not less than 30 mN/m.

Method for manufacturing printed matter

Provided is a gravure printing method by which high printing density and excellent highlight suitability are obtained, even if a gravure plate having high resolution and reduced thickness is used. The gravure printing method comprises: using an aqueous ink having a Zahn cup #3 viscosity at 20&#xb0; C. of 11.0 seconds or more and 20.0 seconds or less, and having an evaporation rate of 30 mass % or less in a drying test, the drying test involving drying 1 g of the ink at a temperature of 40&#xb0; C. and an air flow of 1,400 L/min for 30 minutes; and transferring 1 ml/mor more and 7 ml/mor less of the ink onto a printing medium.

Provided is an aqueous gravure ink that is environmentally friendly, allows high-resolution printing by virtue of its excellent highlight suitability, and is excellent in drying property. The aqueous gravure ink comprises: a pigment; a polymer; a water-soluble organic solvent; a surfactant; and water, in which the water-soluble organic solvent has a boiling point of 100&#xb0; C. or more and 260&#xb0; C. or less, in which a content of the water-soluble organic solvent in the aqueous gravure ink is 10 mass % or more and 35 mass % or less, and in which a content of the water in the aqueous gravure ink is 50 mass % or more and 70 mass % or less.

The present invention relates to an ink-jet printing method that is capable of obtaining good printed materials that are free of occurrence of color migration and deformation of a printing medium even when printed on a resin printing medium. The present invention provides an ink-jet printing method using a water-based ink containing a black ink, a chromatic ink and a white ink which each contain a pigment (A), an organic solvent (C) having a boiling point of not lower than 90&#xb0; C. and lower than 250&#xb0; C., and water, said method including step 1 of ejecting at least one water-based ink selected from the group consisting of the black ink and the chromatic ink onto a transparent resin printing medium to print an image 1 on the printing medium; step 2 of ejecting the white ink onto the resulting image 1 to print a white image that covers the image 1 on the printing medium; and step 3 of heating and drying the resulting printed material from a side of a surface of the printing medium on which the white image is formed, using an infrared heater.

Ink jet recording method

There is provided a water-based ink for ink-jet printing which is excellent in optical density when printed on any of a high-water absorbing recording medium and a low-water absorbing recording medium, spreading of the dot size on the low-water absorbing recording medium, and rub fastness. The present invention relates to a water-based ink for ink-jet printing, including pigment-containing water-insoluble polymer particles A, water-insoluble polymer particles B, an organic solvent C and water, in which the water-insoluble polymer particles A are constituted of a water-insoluble polymer (a) including a constitutional unit derived from an ionic monomer, a constitutional unit derived from an aromatic ring-containing hydrophobic monomer and a constitutional unit derived from a specific hydrophilic nonionic monomer; the constitutional unit derived from the hydrophilic nonionic monomer is present in an amount of not less than 13% by mass and not more than 45% by mass on the basis of whole constitutional units in the water-insoluble polymer (a); the organic solvent C includes one or more organic solvents having a boiling point of 90&#xb0; C. or higher in which a weighted mean boiling point of the organic solvent C which is weighted by contents (% by mass) of the respective organic solvents in the organic solvent C is 250&#xb0; C. or lower; and a content of the organic solvent C in the water-based ink is not less than 20% by mass.

Water-based ink for inkjet recording

The present invention relates to an ink jet printing method for printing images or characters on a recording medium using a water-based ink, in which the water-based ink includes pigment-containing water-insoluble polymer particles A, water-insoluble polymer particles B, an organic solvent C and water; the water-insoluble polymer particles A includes a water-insoluble polymer (a) containing constitutional units derived from an ionic monomer (a-1), an aromatic ring-containing hydrophobic monomer (a-2) and a specific hydrophilic monomer (a-3), the constitutional unit derived from the hydrophilic monomer (a-3) being present in an amount of from 13 to 45% by mass; the organic solvent C includes one or more organic solvents having a boiling point of 90&#xb0; C. or higher, and has an average boiling point of 250&#xb0; C. or lower as a weighted mean value; and the recording medium has a water absorption of from 0 to 10 g/m2 as measured in a pure water contact time of 100 ms. The ink-jet printing method is excellent in spreading of the dot size, optical density, gloss and rub fastness when printed on a low-water absorbing recording medium.

Ink-jet printing method

The present invention relates to [1] an ink-jet printing method including the steps of applying an ink (A) having a static surface tension of from 23 to 70 mN/m and containing a poly(N-acylalkylene imine)-modified silicone and a cationic polymer onto a recording medium, and then applying by ink-jet printing, a water-based ink (B) onto the recording medium; [2] a recording paper for ink-jet printing which is obtainable by applying an ink (A) having a static surface tension of from 23 to 70 mN/m and containing a poly(N-acylalkylene imine)-modified silicone and a cationic polymer onto a recording medium; and [3] a water-based ink set including an ink (A) having a static surface tension of from 23 to 70 mN/m and containing a poly(N-acylalkylene imine)-modified silicone and a cationic polymer, and a water-based ink (B) containing an anionic colorant.

The present invention relates to (1) a process for producing a water dispersion for ink-jet printing containing colorant-containing polymer particles which includes a step I of obtaining a dispersion of colorant-containing polymer particles; a step II of obtaining a water dispersion of the colorant-containing polymer particles from the dispersion obtained in the step I; a step III of mixing the water dispersion obtained in the step II with an organic solvent (B) to suitably control a relative dielectric constant of a mixed solvent in the resultant dispersion, thereby precipitating the colorant-containing polymer particles; and a step IV of separating precipitates obtained in the step III from the dispersion and re-dispersing the precipitates in a water-based solvent; (2) a water-based ink for ink-jet printing which is excellent in ejection stability and optical density; (3) a process for purifying a water dispersion for ink-jet printing; and (4) a process for producing a dispersion containing groups of fine particles.

Water-based inks for ink-jet printing

The present invention relates to a water-based ink for ink-jet printing which exhibits a high optical density even upon one-pass printing on plain papers and is suitable for high-speed printing, and a dispersion used in the water-base ink. There are provided a water dispersion for ink-jet printing, including water-insoluble polymer particles containing a colorant, and a nonionic organic compound satisfying the following conditions I and II:

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 Ris a hydrogen atom or a methyl group; and Ris a substituted or unsubstituted arylalkyl group or a substituted or unsubstituted aryl group; and where Ris a hydrogen atom or a methyl group; RO is an oxypropylene group; RO is an oxyalkylene group having 2 or 4 carbon atoms; Ris 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.

The present invention relates to a water dispersion for ink-jet printing, including a colorant, particles (A) (except for pigments) having a refractive index of 1.0 to 2.2, and a nonionic organic compound containing a saturated or unsaturated hydrocarbon group having 8 to 30 carbon atoms, and exhibiting a solubility of 1 g or less in 100 g of water as measured at 25&#xb0; C., as well as a water based ink containing the water dispersion. There are provided a water-based ink for ink-jet printing which can exhibit a high optical density upon one-pass printing on plain papers and, therefore, is suitable for high-speed printing, as well as a water dispersion used in the water-based ink.

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Wakayama, Japan

Ryuma Mizushima