公开(公告)号：US20220204798A1

公开(公告)日：2022-06-30

申请号：US17417510

申请日：2019-04-26

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA

IPC: C09D11/52 ,  C09D17/00 ,  C09D11/037 ,  C09D11/033 ,  C09D11/106 ,  C09D11/322 ,  C09D11/36 ,  B41M5/00 ,  B41M1/22 ,  H01Q1/22

Abstract: The present invention relates to [1] a dispersion of metal fine particles containing hydroxyacetone and propylene glycol, in which a cumulant average particle size of the metal fine particles is not less than 0.01 μm and not more than 0.1 μm, and [2] an ink containing the dispersion of metal fine particles as described in the above [1].

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：US20230057712A1

公开(公告)日：2023-02-23

申请号：US17788535

申请日：2020-12-24

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA ,  Kosuke MUTO

IPC: C09D11/38 ,  C09D11/52 ,  C09D11/326 ,  B41M5/00

Abstract: A metal fine particle-containing ink that contains metal fine particles dispersed therein with a polymer dispersant, a low-molecular weight carboxylic acid and an aqueous solvent, wherein the polymer dispersant contains a constitutional unit derived from an acid group-containing monomer; a content of the low-molecular weight carboxylic acid C in the ink is not less than 1% by mass and not more than 15% by mass. A boiling point (C) of the low-molecular weight carboxylic acid and a boiling point (D) of the aqueous solvent satisfy the following relational formula (I); and an acid dissociation exponent pKa (C) of the low-molecular weight carboxylic acid and an acid dissociation exponent pKa (B) of an acid group in the polymer dispersant satisfy the following relational formula (II): boiling point (C)>boiling point (D)   (I), and pKa (C)

公开(公告)号：US20220204801A1

公开(公告)日：2022-06-30

申请号：US17605805

申请日：2019-04-26

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA ,  Kosuke MUTO

IPC: C09D11/52 ,  C09D11/037 ,  C09D11/033 ,  C09D11/102 ,  C09D11/322 ,  C09D11/36 ,  B41M5/00

Abstract: The present invention relates to a metal fine particle-containing ink containing metal fine particles (a) dispersed therein with a polymer B, in which the ink contains an ink solvent S; a difference ΔSP (|SP(S)−SP(B)|) between solubility parameters of the solvent S and the polymer B is not more than 1.5 (cal/cm3)0.5 wherein SP(S) and SP(B) are a solubility parameter of the ink solvent S and a solubility parameter of the polymer B, respectively, as measured by a Fedors method; and the SP(B) is not less than 9.5 (cal/cm3)0.5 and not more than 10.5 (cal/cm3)0.5, as well as a method for producing a printed material, which includes the step of applying the metal fine particle-containing ink to a printing substrate to form a metal coating film of the ink on the printing substrate under ordinary-temperature environments, thereby obtaining the printed material.

公开(公告)号：US20210253885A1

公开(公告)日：2021-08-19

申请号：US17270668

申请日：2019-04-26

Applicant: KAO CORPORATION

Inventor： Tomohide YOSHIDA ,  Hirotaka TAKENO

IPC: C09D11/107 ,  C09D17/00 ,  C09D11/037 ,  C09D11/033 ,  C09D11/322 ,  C09D11/52 ,  B22F9/24 ,  B22F1/00 ,  B41M5/00

Abstract: The present invention relates to a water-based metal fine particle dispersion containing metal fine particles (a) dispersed with a dispersant B, in which the dispersant B contains a vinyl-based polymer (b) containing a constitutional unit derived from a hydrophobic monomer, a constitutional unit derived from a carboxy group-containing monomer and a constitutional unit derived from a polyalkylene glycol segment-containing monomer in an amount of not less than 85% by mass, the fine particles (a) have a cumulant average particle size of 2 to 50 nm, and a concentration of metal in the dispersion is 30 to 80% by mass, and a process for producing the dispersion; a metallic printing ink containing the dispersion; and a metallic printing method using the ink.

公开(公告)号：US20200089139A1

公开(公告)日：2020-03-19

申请号：US16616314

申请日：2018-03-22

Applicant: KAO CORPORATION

Inventor： Norihiro HIRAI ,  Tomohide YOSHIDA ,  Takashi KANNO

IPC: G03G9/087

Abstract: Provided are a toner for developing electrostatic images excellent in low-temperature fusing property, gloss and carrier contamination resistance, and a wax dispersant. [1] A toner for developing electrostatic images, containing an amorphous composite resin (A), an amorphous polyester resin (B), and a wax, wherein the amorphous composite resin (A) contains a polyester resin segment which is a polycondensate of an alcohol component containing an aromatic diol and a carboxylic acid component containing an aliphatic dicarboxylic acid whose main chain has 8 or more and 14 or less carbon atoms, a vinylic resin segment of an addition polymer of a raw material monomer containing a styrenic compound, and a constitutional unit derived from a bireactive monomer, the constitutional unit bonding to the polyester resin segment and the vinylic resin segment each via a covalent bond; and has a glass transition temperature not lower than 45° C., and the ratio by mass of the amorphous composite resin (A) to the amorphous polyester resin (B) [(A)/(B)] is 1/99 or more and 60/40 or less; and [2] a wax dispersant containing the amorphous composite resin (A).

公开(公告)号：US20190317416A1

公开(公告)日：2019-10-17

申请号：US16318525

申请日：2017-07-18

Applicant: KAO CORPORATION

Inventor： Eiji SHIRAI ,  Tomohide YOSHIDA

IPC: G03G9/087 ,  G03G15/08 ,  G03G9/08 ,  C08L67/02 ,  C08L25/14

Abstract: The present invention relates to a binder resin composition for toners for development of electrostatic images capable of giving a toner excellent in fusing properties on PP films, a toner for development of electrostatic images containing the binder resin composition, a printing method using the toner, and a printed material. [1] A binder resin composition for toners for development of electrostatic images, including a polyester-based resin and polyolefin particles, wherein the polyolefin particles contain a polymer having a polymer skeleton of olefin having 2 or more and 3 or less carbon atoms, the volume median diameter (D50) of a small particle size component, as measured according to a dynamic light scattering method using a dispersion S of a small particle size component obtainable according to Methods 1 and 2, is 20 nm or more and 400 nm or less, the content of a large particle size component obtainable according to Method 2 is 0% by mass or more and 30% by mass or less relative to the total amount of the large particle size component and the small particle size component, and the content of the small particle size component is 70% by mass or more and 100% by mass or less relative to the total amount of the large particle size component and the small particle size component, and the melting endothermic energy amount of the small particle size component is 3 J/g or more and 10 J/g or less; [2] a toner for development of electrostatic images including the binder resin composition for toners for development of electrostatic images according to the above [1] in an amount of 20% by mass or more and 100% by mass or less in the binder resin therein, and including a releasing agent having a melting point of 60° C. or higher and 100° C. or lower in an amount of 1 part by mass or more and 10 parts by mass or less relative to 100 parts by mass of the binder resin; [3] a printing method including printing on a plastic film according to an electrophotographic method with the toner for development of electrostatic images according to the above [2]; and [4] a printed material obtainable according to the method of the above [3].