公开(公告)号：US20190227448A1

公开(公告)日：2019-07-25

申请号：US15998956

申请日：2017-02-17

Applicant: KAO CORPORATION

Inventor： Shogo WATANABE ,  Kotaro SHIMADA ,  Arisa YAMAMOTO

IPC: G03G9/08 ,  G03G9/087

Abstract: The present invention relates to a process for producing a toner for electrophotography that is excellent in the low-temperature fusing property, the initial image quality after storage, and the document offset property. A process for producing a toner for electrophotography, including step 1: melt-mixing a mixture containing a crystalline resin (C) and ester wax (W) having a dipentaerythritol unit as a constitutional component, wherein a difference |Cmp−Wmp| between a melting point Cmp of the crystalline resin (C) and a melting point Wmp of the ester wax (W) is 30° C. or less, and the melt-mixing is performed at a temperature Kt that is the melting point Cmp or more and the melting point Wmp or more.

公开(公告)号：US20140120465A1

公开(公告)日：2014-05-01

申请号：US14046021

申请日：2013-10-04

Applicant: Kao Corporation

Inventor： Shogo WATANABE ,  Takeshi ASHIZAWA ,  Takashi KUBO ,  Norihiro HIRAI

IPC: G03G9/087

CPC classification number: G03G9/08755 ,  G03G9/081 ,  G03G9/08782 ,  G03G9/08797

Abstract: A method for producing a toner for electrostatic image development including the step of melt-kneading a mixture containing a resin binder and a wax, wherein the resin binder contains an amorphous polyester (A) obtained by polycondensing an alcohol component containing an aliphatic diol (a) having 3 or 4 carbon atoms, the aliphatic diol having a hydroxyl group bonded to a secondary carbon atom, and an aliphatic diol (b) containing one or more α,ω-linear alkanediols having 2, 4, 6 or 8 carbon atoms, and a carboxylic acid component. The toner for electrostatic image development can be suitably used in, for example, the development or the like of latent image formed in an electrostatic development method, an electrostatic recording method, an electrostatic printing method, or the like

Abstract translation: 一种静电图像显影用调色剂的制造方法，其特征在于，包括熔融捏合含有树脂粘合剂和蜡的混合物的工序，其中，所述树脂粘合剂含有通过使含有脂肪族二醇的醇成分缩聚得到的无定形聚酯（A） 具有3或4个碳原子的脂族二醇，具有与仲碳原子键合的羟基的脂族二醇和含有一个或多个具有2,4,6或8个碳原子的α，ω-直链烷二醇的脂族二醇（b） 和羧酸组分。 用于静电图像显影的调色剂可以适用于例如静电显影方法形成的潜像的显影等，静电记录方法，静电印刷方法等

公开(公告)号：US20210389687A1

公开(公告)日：2021-12-16

申请号：US17291138

申请日：2019-11-20

Applicant: KAO CORPORATION

Inventor： Yuka AMAHA ,  Yuki WAKABAYASHI ,  Shogo WATANABE

IPC: G03G9/087 ,  C08L51/08 ,  C08F283/02 ,  G03G15/08

Abstract: The invention relates to a toner for development of electrostatic images excellent in fusing property on polypropylene films and excellent in rubfastness of printed images, and a resin composition for a toner for development of electrostatic images. The toner for development of electrostatic images and the resin composition for a toner for development of electrostatic images each contain an amorphous polyester-based resin A and a crystalline polyester-based resin C, wherein the amorphous polyester-based resin A has a constituent moiety derived from a polyester resin, and a constituent moiety derived from a reactive functional group-having modified polyolefin-based polymer A, the polyester resin-derived constituent moiety and the modified polyolefin-based polymer A-derived constituent moiety being bonded via a covalent bond, and the amount of the modified polyolefin-based polymer A-derived constituent moiety is 5% by mass or more and 30% by mass or less relative to the total amount of the resin component in the toner.

公开(公告)号：US20170363981A1

公开(公告)日：2017-12-21

申请号：US15532372

申请日：2015-11-25

Applicant: KAO CORPORATION

Inventor： Shogo WATANABE ,  Kohei KATAYAMA ,  Yasuhiro HIDAKA ,  Hiroki KAKIUCHI

IPC: G03G9/087

CPC classification number: G03G9/08755 ,  G03G9/08706 ,  G03G9/08708 ,  G03G9/08711 ,  G03G9/08795 ,  G03G9/08797

Abstract: A toner for electrophotography containing a resin binder containing a crystalline resin and an amorphous resin, and a releasing agent, wherein the crystalline resin contains a crystalline composite resin C containing a polycondensation resin component and a styrenic resin component, wherein the polycondensation resin component is obtained by polycondensing a specified alcohol component and a specified carboxylic acid component, and wherein the amorphous resin contains an amorphous composite resin AC containing a polycondensation resin component and a styrenic resin component, wherein the polycondensation resin component is obtained by polycondensing an alcohol component and a specified carboxylic acid component, and an amorphous polyester AP obtained by polycondensing an alcohol component and a specified carboxylic acid component, wherein a softening point of the amorphous polyester AP is higher than a softening point of the amorphous composite resin AC, wherein a difference in softening points between the amorphous polyester AP and the amorphous composite resin AC is 10° C. or more and 50° C. or less. The toner for electrophotography of the present invention is suitably used in development of latent images or the like which is formed in, for example, electrostatic development method, electrostatic recording method, electrostatic printing method or the like.

公开(公告)号：US20210149318A1

公开(公告)日：2021-05-20

申请号：US16637872

申请日：2018-08-13

Applicant: KAO CORPORATION

Inventor： Shogo WATANABE

IPC: G03G9/087 ,  G03G9/097 ,  G03G9/113 ,  G03G9/08 ,  C08K5/103

Abstract: A positively charged toner for development of an electrostatic image, containing matrix particles containing at least a binder resin and a release agent, coated with inorganic fine particles, the binder resin containing a crystalline resin, the release agent containing ester wax (W) containing a dipentaerythritol unit as a constitutional component, the inorganic fine particles containing positively charged silica (S1) and negatively charged silica (S2), and the positively charged silica (S1) having an average particle diameter that is smaller than an average particle diameter of the negatively charged silica (S2), and the negatively charged silica (S2) having an average particle diameter of 10 nm or more and 90 nm or less.

公开(公告)号：US20180196366A1

公开(公告)日：2018-07-12

申请号：US15107155

申请日：2014-12-24

Applicant: KAO CORPORATION

Inventor： Shogo WATANABE ,  Kunihiro KANO

IPC: G03G9/08 ,  G03G9/087

CPC classification number: G03G9/0806 ,  G03G9/081 ,  G03G9/0812 ,  G03G9/0819 ,  G03G9/0821 ,  G03G9/08755 ,  G03G9/08762 ,  G03G9/08782

Abstract: A toner for electrophotography obtained by a method including: step 1: mixing a polyester and a polylactic acid at a temperature of 140° C. or higher and 200° C. or lower and subjecting the mixture to a transesterification reaction to provide a resin composition; and step 2: mixing the resin composition obtained in step 1 with a polyester which is identical to and/or different from the polyester of step 1, and a method for producing the toner. The toner for electrophotography of the present invention is suitably used in developing latent images formed in an electrophotographic method, an electrostatic recording method, an electrostatic printing method, or the like.