公开(公告)号：US20210163765A1

公开(公告)日：2021-06-03

申请号：US17268029

申请日：2019-10-18

Applicant: KAO CORPORATION

Inventor： Yuki OZAKI ,  Yasufumi UEDA ,  Ryuma MIZUSHIMA ,  Takuto MATSUZONO

IPC: C09D11/023 ,  C09D11/033 ,  C09D11/108 ,  B41M1/30 ,  B41M1/10

Abstract: The present invention provides an aqueous ink for plate-based printing which is excellent in transfer properties and substrate adhesion properties even against a low-liquid absorbing printing medium, and a plate-based printing method using the aqueous ink. The present invention relates to [1] an aqueous ink for plate-based printing which contains pigment-containing crosslinked water-insoluble polymer particles A, pigment-free water-insoluble polymer particles B, an organic amine compound, not less than 1% by mass and not more than 30% by mass of a water-soluble organic solvent having a boiling point of not lower than 100° C. and not higher than 260° C., and water, and [2] a plate-based printing method including the step of printing characters or images on a low-liquid absorbing printing medium using the aforementioned aqueous ink.

公开(公告)号：US20190315984A1

公开(公告)日：2019-10-17

申请号：US16463515

申请日：2017-11-30

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA ,  Yasufumi UEDA

IPC: C09D11/322 ,  C09C3/06 ,  C09C3/10 ,  C09C1/36

Abstract: The present invention relates to white fine particles from which a white ink that is capable of satisfying both of high hiding power and good bending resistance in a printed material can be obtained, and further relates to white fine particles from which an ink that is capable of satisfying not only excellent fixing properties even when printed on a non-liquid absorbing printing medium such as a resin film, but also suppression of increase in viscosity of the ink and at the same time good deinking properties at a high level can be obtained. The present invention provides [1] white fine particles containing titanium oxide and a polymer component with which the titanium oxide is encapsulated, in which a titanium atomic fraction of a surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by X-ray photoelectron spectroscopy (XPS) is not more than 7 atomic %, [2] a water-based ink containing the aforementioned white fine particles, in which the titanium atomic fraction of the surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by XPS is not more than 5 atomic %, and [3] a process for producing a dispersion of white fine particles, including step 1 of mixing titanium oxide and a polymer dispersant to obtain a titanium oxide dispersion and step 2 of adding a polymerizable monomer to the thus obtained titanium oxide dispersion to subject the polymerizable monomer to polymerization reaction, thereby obtaining the dispersion of the white fine particles, in which a titanium atomic fraction of a surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by XPS is not more than 7 atomic %.

公开(公告)号：US20210388224A1

公开(公告)日：2021-12-16

申请号：US17291036

申请日：2019-12-03

Applicant: KAO CORPORATION

Inventor： Ryuma MIZUSHIMA ,  Yuki OZAKI ,  Takuto MATSUZONO ,  Yasufumi UEDA

IPC: C09D11/037 ,  C09D5/14 ,  C09D11/03 ,  C09D11/106

Abstract: The present invention relates to an aqueous gravure ink containing pigment particles A, polymer particles B and water, the aqueous gravure ink being capable of satisfying at least one of the following requirements 1 and 2: Requirement 1: an average particle size of whole particles in the aqueous gravure ink is not less than 150 nm and not more than 500 nm, and a polydispersity index in a particle size distribution of the whole particles is not less than 0.10 and not more than 0.30; and Requirement 2: an average particle size of the pigment particles A is not less than 140 nm and not more than 550 nm, and a polydispersity index in a particle size distribution of the pigment particles A is not less than 0.08 and not more than 0.32, and an average particle size of the polymer particles B is not less than 30 nm and not more than 220 nm, and a polydispersity index in a particle size distribution of the polymer particles B is not less than 0.08 and not more than 0.32. The aqueous gravure ink of the present invention is excellent in storage stability and is capable of providing a printed material that is excellent in rub fastness and adhesion properties.

公开(公告)号：US20210277331A1

公开(公告)日：2021-09-09

申请号：US16473494

申请日：2017-12-26

Applicant: KAO CORPORATION

Inventor： Takayuki SUZUKI ,  Yasufumi UEDA

IPC: C11D1/72 ,  C11D11/00 ,  C11D3/20 ,  C11D3/43 ,  C11D17/00 ,  B41J2/165

Abstract: The present invention relates to a cleaning liquid for a water-based ink that contains a pigment and a water-insoluble polymer, said cleaning liquid containing (A) an acetylene glycol having an average molar number of addition of EO of 0 to 2 mol, (B) at least one compound selected from the group consisting of an acetylene glycol having an average molar number of addition of EO of not less than 4 mol and a polyethylene glycol alkyl ether containing an alkyl group having not less than 8 carbon atoms, (C) a water-soluble organic solvent and water, in which the water-soluble organic solvent (C) contains at least one water-soluble organic solvent having a boiling point of not lower than 90° C.; a boiling point of the water-soluble organic solvent (C) is not higher than 250° C. in terms of a weighted mean value thereof; and a content of the water-soluble organic solvent (C) in the cleaning liquid is not more than 20% by mass; a process for producing the cleaning liquid; and a method of cleaning a water-based ink using the cleaning liquid.

公开(公告)号：US20200230988A1

公开(公告)日：2020-07-23

申请号：US16305020

申请日：2017-06-01

Applicant: KAO CORPORATION

Inventor： Ryuma MIZUSHIMA ,  Yasufumi UEDA

IPC: B41M5/00 ,  C09D11/322

Abstract: 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.

公开(公告)号：US20190352434A1

公开(公告)日：2019-11-21

申请号：US16473186

申请日：2017-12-22

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA ,  Yasufumi UEDA

IPC: C08F2/44 ,  C09D11/322 ,  C08F2/06 ,  C09D11/326 ,  C09D17/00 ,  C08K5/37 ,  C08F212/08 ,  C08F220/06 ,  B41J2/01 ,  C08K9/06

Abstract: The present invention relates to a process for producing a dispersion of white fine particles from which a white ink that is capable of exhibiting excellent hiding power, rub fastness and water resistance even when printed on a low-water absorbing printing medium can be obtained by incorporating the dispersion of the white fine particles into the ink, and a water-based ink for ink-jet printing which contains the white fine particles. The present invention provides [1] a process for producing a dispersion of white fine particles, including step 1 of mixing titanium oxide and a polymer dispersant at a pH value that is not less than an acid dissociation exponent (pKa) of at least a part of an acid component of the polymer dispersant to thereby obtain a titanium oxide dispersion, in which an isoelectric point (A) of the titanium oxide and the acid dissociation exponent (pKa) (B) of the polymer dispersant satisfy a relationship represented by the formula: A−B≥0, the polymer dispersant contains a constitutional unit derived from a hydrophobic monomer, and a volume median particle size (D50) of particles in the titanium oxide dispersion is from 150 to 500 nm; and step 2 of adding a polymerizable monomer to the titanium oxide dispersion obtained in the step 1 to subject the polymerizable monomer to polymerization reaction, thereby obtaining the dispersion of the white fine particles, and [2] a water-based ink for ink-jet printing which contains the white fine particles obtained above.

公开(公告)号：US20190047299A1

公开(公告)日：2019-02-14

申请号：US16077298

申请日：2017-02-02

Applicant: KAO CORPORATION ,  THINK LABORATORY CO., LTD.

Inventor： Yuta MATSUMOTO ,  Ryuma MIZUSHIMA ,  Takahiro SATO ,  Kazuki WATANABE ,  Yasufumi UEDA ,  Tatsuo SHIGETA

IPC: B41J11/00 ,  B41M5/00 ,  B41J2/21

Abstract: 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° C. and lower than 250° 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.

公开(公告)号：US20190030918A1

公开(公告)日：2019-01-31

申请号：US16077131

申请日：2017-02-02

Applicant: KAO CORPORATION ,  THINK LABORATORY CO., LTD.

Inventor： Yuta MATSUMOTO ,  Yasufumi UEDA ,  Tatsuo SHIGETA

IPC: B41J11/00 ,  B41J15/16

Abstract: The present invention relates to an ink-jet printing apparatus that is capable of obtaining printed materials having good appearance while maintaining high quality of printed characters or images even when printed on a resin printing medium using a water-based ink, and an ink-jet printing method. The present invention provides an ink-jet printing apparatus in which when setting a plurality of measuring positions of a printing medium including a position of the printing medium at which the printing medium is wound into a web roll in a web roll heating/supporting mechanism and positions of the printing medium which are respectively located just below a plurality of ink-jet printing heads, a plurality of temperature measuring devices measure temperatures of a surface of the printing medium at the plurality of measuring positions, respectively, and a heating amount control device controls a heating amount of the web roll heating/supporting mechanism and heating amounts of under heaters on the basis of the plural measured temperatures such that a difference between the temperatures measured in a portion of the printing medium to which a tension force is applied falls within the range of 10° C., and an ink-jet printing method using the ink-jet printing apparatus.

公开(公告)号：US20180244093A1

公开(公告)日：2018-08-30

申请号：US15756364

申请日：2016-08-03

Applicant: THINK LABORATORY CO., LTD. ,  KAO CORPORATION

Inventor： Tatsuo SHIGETA ,  Ryuma MIZUSHIMA ,  Yuta MATSUMOTO ,  Yasufumi UEDA

IPC: B41M1/10 ,  B41F3/36 ,  B41F9/06 ,  C09D11/023

CPC classification number: B41M1/10 ,  B41F3/36 ,  B41F9/00 ,  B41F9/061 ,  B41F13/11 ,  B41N1/06 ,  C09D11/023

Abstract: 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° 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° C. and an air flow of 1,400 L/min for 30 minutes; and transferring 1 ml/m2 or more and 7 ml/m2 or less of the ink onto a printing medium.

公开(公告)号：US20210163767A1

公开(公告)日：2021-06-03

申请号：US16972419

申请日：2019-04-02

Applicant: KAO CORPORATION

Inventor： Yuki OZAKI ,  Yasufumi UEDA ,  Ryuma MIZUSHIMA ,  Takuto MATSUZONO

IPC: C09D11/037 ,  C09D11/108 ,  C09D11/107

Abstract: 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.