公开(公告)号：US20230365727A1

公开(公告)日：2023-11-16

申请号：US18027473

申请日：2021-09-28

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: C08F20/20

CPC classification number: C08F20/20

Abstract: Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell and which have a void ratio of 50% or more, wherein the shell contains, as the resin, a polymer in which 70 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units, and wherein, in a hollow particle immersion test in which a mixture obtained by adding 0.1 mg of the hollow particles to 4 mL of acetone and shaking them for 10 minutes at a shaking rate of 100 rpm, is left to stand for 48 hours in an environment at 25° C., less than 5% by mass of the hollow particles submerge in the acetone.

公开(公告)号：US11226569B2

公开(公告)日：2022-01-18

申请号：US16907738

申请日：2020-06-22

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/08 ,  G03G9/09 ,  G03G9/087

Abstract: The magenta toner is excellent in image density, has an enhanced chargeability, and can be produced at a low cost. The magenta toner includes a binder resin and a magenta colorant. A compound A represented by the following general formula (1) and C.I. Solvent Violet 59 are contained as the magenta colorant.

公开(公告)号：US20240367132A1

公开(公告)日：2024-11-07

申请号：US18574182

申请日：2022-07-05

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe ,  Sakyo Yagyu

IPC: B01J13/16 ,  C08F2/44 ,  C08F212/12 ,  C08F212/36 ,  C08F222/10

Abstract: Hollow particles which comprise a resin-containing shell and a hollow portion surrounded by the shell, wherein a void ratio is 50% or more; wherein the shell contains, as the resin, a polymer in which 60 to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units; wherein the hollow particles have at least one kind of reactive group selected from a hydroxy group and an amino group on a surface thereof and the hydroxyl value is 0.20 mmol/g or more or the amine value is 0.20 mmol/g or more, or wherein the hollow particles have at least one kind of reactive group selected from the group consisting of a carboxy group, a carboxylic anhydride group and a sulfo group on a surface thereof and the acid value is 0.20 mmol/g or more.

公开(公告)号：US20220355264A1

公开(公告)日：2022-11-10

申请号：US17778080

申请日：2020-12-02

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: B01J13/18 ,  C08F265/06 ,  C08F2/44 ,  C08F2/18

Abstract: The method produces hollow particles which have a high void ratio, which can reduce the residual amount of a sparingly water-soluble solvent used in the production process, and which are less likely to collapse. The method for producing hollow particles which comprise a shell and a hollow portion and which have a void ratio of 50% or more and 90% or less, wherein a suspension treatment of a mixture liquid containing a polymerizable monomer for shell, a polar resin, a hydrocarbon solvent, a sparingly water-soluble inorganic metal salt as a dispersant, and an aqueous medium is carried out to prepare a suspension in which droplets of a monomer composition containing the polymerizable monomer for shell, the polar resin and the hydrocarbon solvent are dispersed in the aqueous medium; a polymerization reaction of the suspension is carried out; and the hydrocarbon solvent is removed from the obtained hollow particles.

公开(公告)号：US11281117B2

公开(公告)日：2022-03-22

申请号：US16957596

申请日：2018-12-27

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/097 ,  G03G9/087 ,  G03G9/09 ,  G03G9/113

Abstract: The present invention provides a toner for electrostatic-image development comprising color resin particle containing a binder resin, a colorant, a charge control agent, and a thickener, wherein the binder resin is a copolymer including styrene-monomer unit and (meth)acrylate monomer unit, the thickener is a resin containing a nitrogen atom, and the content of nitrogen atom is 150 to 1500 mass ppm in the toner for electrostatic-image development.

公开(公告)号：US20180107127A1

公开(公告)日：2018-04-19

申请号：US15561722

申请日：2016-03-10

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/08 ,  G03G9/087 ,  G03G9/09 ,  G03G9/097

CPC classification number: G03G9/08 ,  G03G9/0806 ,  G03G9/087 ,  G03G9/08706 ,  G03G9/08708 ,  G03G9/08791 ,  G03G9/09 ,  G03G9/0904 ,  G03G9/097 ,  G03G9/0975 ,  G03G9/09783

Abstract: To provide an efficient method for producing a negatively chargeable toner in which a carbon black (as a colorant) is well dispersed and which has high chargeability, has excellent transfer efficiency, prevent a white spot and provides an image with sufficient image density. Disclosed is a method for producing a negatively chargeable toner, the method including: a suspension step of obtaining a suspension in which droplets of a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black, a softening agent and a charge control agent, which is a specific, sulfonic acid group-containing copolymer, are dispersed, by suspending the polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer, and a step of obtaining colored resin particles by suspension polymerization using the suspension in the presence of a polymerization initiator.

公开(公告)号：US12215178B2

公开(公告)日：2025-02-04

申请号：US18272429

申请日：2022-01-25

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: C08F222/10 ,  B01J13/16 ,  B01J13/20 ,  C08F212/36

Abstract: Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell, wherein a void ratio is 50% or more; wherein a volume average particle diameter is 1.0 μm or more; wherein the shell contains, as the resin, a polymer in which 70 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units; wherein a thermal expansion coefficient at 80° C. to 200° C. is 10.0×10−5/° C. or less; and wherein, in a hollow particle immersion test in which a mixture obtained by adding 0.1 mg of the hollow particles to 4 mL of acetone and shaking them for 10 minutes at a shaking rate of 100 rpm, is left to stand for 48 hours in an environment at 25° C., less than 10% by mass of the hollow particles submerge in the acetone.

公开(公告)号：US20240124634A1

公开(公告)日：2024-04-18

申请号：US18272429

申请日：2022-01-25

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: C08F222/10 ,  B01J13/16 ,  B01J13/20 ,  C08F212/36

CPC classification number: C08F222/102 ,  B01J13/16 ,  B01J13/203 ,  C08F212/36 ,  C08F2800/20 ,  C08F2810/20

Abstract: Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell, wherein a void ratio is 50% or more; wherein a volume average particle diameter is 1.0 μm or more; wherein the shell contains, as the resin, a polymer in which 70 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units; wherein a thermal expansion coefficient at 80° C. to 200° C. is 10.0×10−5/° C. or less; and wherein, in a hollow particle immersion test in which a mixture obtained by adding 0.1 mg of the hollow particles to 4 mL of acetone and shaking them for 10 minutes at a shaking rate of 100 rpm, is left to stand for 48 hours in an environment at 25° C., less than 10% by mass of the hollow particles submerge in the acetone.

公开(公告)号：US20220413410A1

公开(公告)日：2022-12-29

申请号：US17762997

申请日：2020-09-24

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/097

Abstract: Provided is an electrostatic image development toner comprising colored resin particles and an external additive, the colored resin particles containing a binder resin, a colorant, an aromatic vinyl thermoplastic elastomer having a polymerizable unsaturated bond, and a release agent, wherein the release agent is an ester compound having a glycerol skeleton.

公开(公告)号：US20210341852A1

公开(公告)日：2021-11-04

申请号：US17283088

申请日：2019-10-07

Applicant: ZEON CORPORATION ,  NOF CORPORATION

Inventor： Masashi Watanabe ,  Takeshi Yoshimura ,  Norifumi Itako

IPC: G03G9/097 ,  G03G9/08

Abstract: Provided is a wax which is used in a toner, whereby the toner is excellent in low-temperature fixability and heat-resistant shelf stability, the glossiness is improved as compared with the prior art, and the generation of ultrafine particles and the bleeding of the wax are not likely to occur. The wax for toners, wherein the wax is an ester wax generated by esterification of a pentaerythritol and a monocarboxylic acid; wherein the monocarboxylic acid used for the esterification contains a behenic acid, an arachidic acid and a stearic acid; and wherein, with respect to 100% by mass of the monocarboxylic acid, a content ratio of the behenic acid is from 60% by mass to 80% by mass; a content ratio of the arachidic acid is from 5% by mass to 15% by mass; and a content ratio of the stearic acid is from 15% by mass to 25% by mass.