公开(公告)号：US20200332135A1

公开(公告)日：2020-10-22

申请号：US16957567

申请日：2018-12-28

Applicant: KAO CORPORATION

Inventor： Hiroki KAWAGUCHI

IPC: C09D11/037 ,  C09D11/324 ,  C09D11/033 ,  C09D11/107 ,  C09D11/104 ,  C09D11/108 ,  C09D11/106

Abstract: The present invention relates to [1] a water-based pigment dispersion formed by dispersing a pigment in a water-based medium with a polymer dispersant, in which the polymer dispersant contains a (meth)acrylic resin (A) and a resin (B); and the resin (B) is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3), and [2] a process for producing a water-based pigment dispersion, including the following steps 1 and 2: Step 1: subjecting a pigment mixture containing a pigment, an acid group-containing (meth)acrylic resin (A), and a resin (B) which is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3) to dispersion treatment to obtain a dispersion; and Step 2: subjecting the dispersion obtained in the step 1 to crosslinking treatment with a crosslinking agent (C).

公开(公告)号：US20190315983A1

公开(公告)日：2019-10-17

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

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.

公开(公告)号：US20210062030A1

公开(公告)日：2021-03-04

申请号：US16957547

申请日：2018-12-28

Applicant: KAO CORPORATION

Inventor： Hiroki KAWAGUCHI

IPC: C09D17/00 ,  C08F220/06 ,  C08F212/08 ,  C08L75/06 ,  C08K5/00 ,  C08K5/1515 ,  B01F13/00

Abstract: The present invention relates to [1] a water-based pigment dispersion formed by dispersing a pigment in a water-based medium with a polymer dispersant, in which the dispersant contains an acid group-containing (meth)acrylic resin (A) and a polyurethane resin (B); the resin (A) is crosslinked with a crosslinking agent (C), and a crosslinking degree of the resin (A) is from 0.12 to 0.65; and a mass ratio of the pigment [pigment/whole solid components of water-based pigment dispersion] is from 0.25 to 0.75, and [2] a process for producing a water-based pigment dispersion, including step 1 of subjecting a pigment mixture containing a pigment, an acid group-containing (meth)acrylic resin (A) and a polyurethane resin (B) to dispersion treatment to obtain a dispersion; and step 2 of subjecting the dispersion obtained in the step 1 to crosslinking treatment with a crosslinking agent (C).

公开(公告)号：US20190284410A1

公开(公告)日：2019-09-19

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

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.