公开(公告)号：US09670374B2

公开(公告)日：2017-06-06

申请号：US15106965

申请日：2014-12-18

Applicant: KAO CORPORATION

Inventor： Yuki Wakabayashi ,  Hirotaka Takeno ,  Daiki Kawata

IPC: G01D11/00 ,  C09D11/36 ,  C09D11/322 ,  B41J2/01

CPC classification number: C09D11/36 ,  B41J2/01 ,  C09D11/322 ,  C09D11/38

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 5.0% by mass; and a value obtained by multiplying a total content of the pigment and the water-insoluble polymer in the water-based ink by a content of DEGPE in the water-based ink is from 10 and 300; and [2] an image forming method including the steps of mounting a container filled with the water-based ink to an ink-jet printing apparatus equipped with an ink ejecting means; and ejecting the ink onto a recording medium having a water absorption of from 0 to 10 g/m2 as measured by contacting with pure water for 100 ms to print characters or images thereon.

公开(公告)号：US09663676B2

公开(公告)日：2017-05-30

申请号：US14891156

申请日：2014-05-14

Applicant: KAO CORPORATION

Inventor： Takahiro Sato ,  Hirotaka Takeno ,  Hironobu Fukuroi

IPC: C09B67/02 ,  C09D17/00 ,  C09D11/00 ,  C09B67/00 ,  C09B67/46 ,  C09D11/322 ,  C08K5/3437

CPC classification number: C09D17/003 ,  C08K5/3437 ,  C09B67/0002 ,  C09B67/0022 ,  C09B67/009 ,  C09D11/00 ,  C09D11/322 ,  C09D17/00

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 7.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt, and the water-soluble basic compound (E) is blended in an amount of not less than 1.5 parts by mass and not more than 35 parts by mass on the basis of 100 parts by mass of the raw material organic pigment.

公开(公告)号：US10465083B2

公开(公告)日：2019-11-05

申请号：US15738480

申请日：2016-06-24

Applicant: KAO CORPORATION

Inventor： Yuki Wakabayashi ,  Hirotaka Takeno

IPC: B41J2/01 ,  B41J2/21 ,  C09D11/322 ,  B41M5/00 ,  B41M5/50 ,  B41M5/52 ,  B41J11/00 ,  B41M7/00 ,  C09D11/38

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. in the water-based ink is not more than 5% by mass; and an amount of droplets of the water-based ink ejected upon printing the characters or images onto the printing medium is not more than 5 pL, and a printing speed used upon the printing 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 ink-jet printing method.

公开(公告)号：US10316207B2

公开(公告)日：2019-06-11

申请号：US15539370

申请日：2015-12-16

Applicant: KAO CORPORATION

Inventor： Kaname Mitsuyoshi ,  Hirotaka Takeno ,  Takayuki Suzuki ,  Takahiro Yoshikawa

IPC: B41J2/01 ,  C09D11/38 ,  B41M5/00 ,  C09D11/324

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.

公开(公告)号：US10266712B2

公开(公告)日：2019-04-23

申请号：US15504948

申请日：2015-08-18

Applicant: KAO CORPORATION

Inventor： Yuki Wakabayashi ,  Kaname Mitsuyoshi ,  Hirotaka Takeno

IPC: B41J2/01 ,  B41M5/00 ,  C09C1/00 ,  C09D11/30 ,  C09D11/107 ,  C09D11/322

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.

公开(公告)号：US09752033B2

公开(公告)日：2017-09-05

申请号：US14891192

申请日：2014-05-14

Applicant: KAO CORPORATION

Inventor： Takahiro Sato ,  Hironobu Fukuroi ,  Hirotaka Takeno

IPC: C09B67/02 ,  C09B67/00 ,  C09D11/00 ,  C09D17/00 ,  C09B67/04 ,  C09B67/46 ,  C09D11/322 ,  C09B67/20 ,  G03F7/00

CPC classification number: C09B67/0022 ,  C09B67/0002 ,  C09B67/006 ,  C09B67/0066 ,  C09B67/009 ,  C09D11/00 ,  C09D11/322 ,  C09D17/00 ,  C09D17/003 ,  G03F7/0007

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 4.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt; [2] a fine organic pigment produced by the process described in the above [1]; [3] a dispersion produced using the fine organic pigment described in the above [2]; [4] a process for producing a paste of a fine organic pigment, including step 2 of cleaning the kneaded mixture obtained in the step 1; [5] a process for producing a dispersion, including step 3 of subjecting the paste of the fine organic pigment produced by the process described in the above [4], an organic solvent and water to dispersing treatment; and [6] a process for producing an ink, including step 4 of mixing the dispersion produced by the process described in the above [5], with at least one material selected from the group consisting of water and an organic solvent.

公开(公告)号：US10655030B2

公开(公告)日：2020-05-19

申请号：US15738487

申请日：2016-06-24

Applicant: KAO CORPORATION

Inventor： Hirotaka Takeno ,  Yuki Wakabayashi ,  Kaname Mitsuyoshi ,  Takahiro Yoshikawa

IPC: C09D11/40 ,  C09D11/30 ,  B41J2/21 ,  C09D11/033 ,  C09D11/322 ,  C09D11/102 ,  B41M5/00 ,  C09D11/037

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 0.3% by mass; a content of the organic solvent in the water-based ink is from 25 to 50% by mass; and a content of a high-boiling organic solvent in the water-based ink is not more than 5% by mass, an ink set for ink-jet printing including two or more kinds of water-based inks which are each constituted of the aforementioned water-based ink, and an ink-jet printing method including the steps of ejecting the aforementioned water-based ink onto a printing medium, and further ejecting the water-based ink onto the printing medium to overstrike the water-based ink onto the water-based ink that has been ejected onto the printing medium in the previous step. The water-based ink of the present invention is excellent in continuous ejection properties, and is capable of obtaining good printed materials that are free of roller transfer contamination and intercolor bleeding owing to overstriking of the inks even when printed on a non-water absorbing printing medium.

公开(公告)号：US10981385B2

公开(公告)日：2021-04-20

申请号：US16473398

申请日：2017-12-26

Applicant: KAO CORPORATION

Inventor： Takayuki Suzuki ,  Hirotaka Takeno

IPC: B41J2/165 ,  C11D3/37 ,  C11D3/40 ,  C11D3/43

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) a surfactant, (B) a water-soluble organic solvent containing (b-1) diethylene glycol monoisopropyl ether, and water, in which the surfactant (A) contains at least one compound selected from the group consisting of (a-1) an acetylene glycol or an ethyleneoxide adduct of the acetylene glycol, and (a-2) a polyethylene glycol alkyl ether containing an alkyl group having not less than 8 carbon atoms or a polyethylene glycol aryl ether containing an aryl group having not less than 6 carbon atoms, and a content of the water-soluble organic solvent (B) in the cleaning liquid is from 5 to 30% by mass; and a method of cleaning a water-based ink using the cleaning liquid.

公开(公告)号：US10584252B2

公开(公告)日：2020-03-10

申请号：US15738766

申请日：2016-06-24

Applicant: KAO CORPORATION

Inventor： Yuki Wakabayashi ,  Hirotaka Takeno

IPC: C09D11/033 ,  B41M5/00 ,  B41M7/00 ,  B41J11/00 ,  B41J2/21 ,  C09D11/322 ,  C09D11/037

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.