公开(公告)号：US10738207B2

公开(公告)日：2020-08-11

申请号：US15779771

申请日：2016-12-08

Applicant: KAO CORPORATION

Inventor： Koji Azuma ,  Hirokazu Hyakuda ,  Yusuke Shimizu ,  Tetsuya Eguchi ,  Hiroki Kawaguchi

IPC: C09D11/322 ,  C08F220/06 ,  C08F220/18 ,  C08J3/24 ,  C09D11/326 ,  C09D11/328

Abstract: The present invention relates to a water-based pigment dispersion having not only excellent storage stability capable of suppressing solidification of a pigment or the like in ink ejection nozzles, but also excellent ejection properties and fixing properties, while maintaining good water resistance of the pigment dispersion as an advantage attained by using the pigment therein. That is, the present invention relates to a water-based pigment dispersion including a pigment, a polymer dispersant and an aqueous medium in which the pigment is dispersed in the aqueous medium using the polymer dispersant, the polymer dispersant being a water-insoluble polymer including carboxy groups that are at least partially neutralized with an alkali metal hydroxide, and having a crosslinked structure obtained by reacting a part of the carboxy groups with a water-insoluble polyfunctional epoxy compound, said water-based pigment dispersion satisfying the following conditions 1 and 2: Condition 1: a value calculated according to the formula: {[100−(neutralization degree)−(crosslinking degree)]/100}×(acid value of carboxy group-containing water-insoluble polymer) being from 32 to 130 mgKOH/g; and Condition 2: a value calculated according to the formula: [(neutralization degree)/100]×(acid value of carboxy group-containing water-insoluble polymer) being from 48 to 144 mgKOH/g.

公开(公告)号：US09783680B2

公开(公告)日：2017-10-10

申请号：US14891180

申请日：2014-05-14

Applicant: KAO CORPORATION

Inventor： Hironobu Fukuroi ,  Takahiro Sato ,  Isao Tsuru ,  Yusuke Shimizu ,  Yasufumi Ueda

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

CPC classification number: C09B67/0022 ,  C09B67/006 ,  C09B67/0086 ,  C09B67/0089 ,  C09B67/009 ,  C09D11/00 ,  C09D11/322 ,  C09D17/003

Abstract: The present invention provides the following process for producing a fine organic pigment which is capable of producing the fine organic pigment that has a very small primary particle size and is excellent in filtering property even in a cleaning step, 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 steps 1 and 2: step 1: kneading a mixture prepared by compounding a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and a compound represented by the following formula (1) with each other, the compound being compounded in an amount of not less than 0.8 part by mass and not more than 18.0 parts by mass on the basis of 100 parts by mass of the raw material organic pigment: R1O(PO)m(EO)nA (1); and step 2: subjecting the mixture obtained in the step 1 to cleaning treatment with an aqueous solvent and then to filtration, [2] a fine organic pigment produced by the process according to the above aspect [1], [3] a dispersion produced using the fine organic pigment according to the above aspect [2], [4] a process for producing a paste of a fine organic pigment, including the above step 1 and 2, [5] a process for producing a dispersion, including step 3 of subjecting the paste of the fine organic pigment produced by the process according to the above aspect [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 according to the above aspect [5] with at least one material selected from the group consisting of water and an organic solvent.

公开(公告)号：US11459476B2

公开(公告)日：2022-10-04

申请号：US16764571

申请日：2018-12-20

Applicant: KAO CORPORATION

Inventor： Kaname Mitsuyoshi ,  Tsuyoshi Egawa ,  Tomohiko Nagano ,  Yusuke Shimizu

IPC: C09D17/00 ,  B41M5/00 ,  C09B55/00 ,  C09D11/033 ,  C09D11/037 ,  C09D11/322

Abstract: The present invention relates to [1] a process for producing a pigment water dispersion liquid of polymer particles containing an azomethine metal complex pigment (A), said process including the step of subjecting a mixture containing the azomethine metal complex pigment (A), an uncrosslinked aromatic group-containing polymer (b) and water to dispersion treatment using a medialess disperser at an accumulated input energy of not more than 5.0 kWh/kg, [2] a pigment water dispersion liquid containing an azomethine metal complex pigment (A) and a polymer dispersant (B), in which in an optical absorption spectrum of the pigment water dispersion liquid, a ratio of a maximum absorbance (A1max) in a wavelength range of not less than 440 nm and less than 465 nm to a maximum absorbance (A2max) in a wavelength range of not less than 420 nm and less than 440 nm [(A1max)/(A2max)] is not less than 1.000, and [3] a water-based ink for ink-jet printing, containing the aforementioned pigment water dispersion liquid.

公开(公告)号：US11066564B2

公开(公告)日：2021-07-20

申请号：US16341817

申请日：2017-10-13

Applicant: KAO CORPORATION

Inventor： Yusuke Shimizu ,  Koji Azuma ,  Hirokazu Hyakuda ,  Tetsuya Eguchi ,  Hiroki Kawaguchi

IPC: C09D11/322 ,  C08F212/08 ,  C08F218/04 ,  C08F220/18 ,  C08G59/32 ,  C08J3/24 ,  C09D11/326 ,  C09D17/00 ,  C08F220/06

Abstract: The present invention relates to a water-based pigment dispersion containing a polymer dispersant and a pigment, the polymer dispersant being prepared by crosslinking a carboxy group-containing water-insoluble polymer (A) with a water-insoluble polyfunctional epoxy compound, in which carboxy groups of the water-insoluble polymer (A) are at least partially neutralized by an alkali metal compound, and the water-based pigment dispersion satisfies the following conditions 1 to 3. The water-based pigment dispersion of the present invention can exhibit excellent redispersibility capable of suppressing solidification of the pigment or the polymer in ink ejection nozzles and can ensure good storage stability under high-temperature conditions. The conditions 1 to 3 are as follows: Condition 1: a value calculated according to the formula: {[100−(neutralization degree)−(crosslinking degree)]/100}×[acid value of water-insoluble polymer (A)] is from −30 to 30 mgKOH/g: Condition 2: a value calculated according to the formula: [(neutralization degree)/100]×[acid value of water-insoluble polymer (A)] is from 80 to 180 mgKOH/g; and Condition 3: a value calculated according to the formula: [(crosslinking degree)/100]×[acid value of water-insoluble polymer (A)] is from 80 to 180 mgKOH/g.