Canon Kabushiki Kaisha

Riken Corporation

Yuki Hasegawa

Masashi Hirose

Takayuki Toyoda

Yasuaki Murai

Masashi Kawamura

Waka Hasegawa

Masatake Tanaka

Chiaki Nishiura

Masanori Seki

Ayano Mashida

Taiki Watanabe

Takeshi Miyazaki

Kei Inoue

Kosuke Mukumoto

Yutaka Tani

Alistair Forrest

Harukazu Suzuki

Provided are a method of producing a compound having a colorant structure suitable for a pigment dispersant, and a pigment dispersant, a pigment composition, a pigment dispersion, and a toner each containing the compound. The production method is a method of producing a compound in which a polymer portion and a colorant portion are bonded to each other through a linking group, the method including the steps of: (a) polymerizing a vinyl-based polymerizable monomer represented by the formula (A) with a radical initiator having a protective group by living radical polymerization to provide a polymer having the protective group at a terminal thereof; (b) hydrolyzing the protective group of the polymer having the protective group at a terminal thereof obtained by the step (a) to deprotect the polymer; and (c) bonding the deprotected polymer obtained by the step (b) and a colorant to each other through a covalent bond.

Method of producing a compound having a colorant structure, and toner containing a compound obtained by the production method

To provide a method for producing a compound that enhances dispersibility of a pigment of respective colors in a water-insoluble solvent, as well as a pigment dispersant, and a pigment composition, a pigment dispersion and a toner having a good tinting power. A method for producing a compound, including the following: (i): subjecting a polymerizable monomer forming a monomer unit represented by formula (1) to radical polymerization in the presence of a radical polymerization initiator and an iodine molecule to provide a polymer; and (ii): binding a colorant to a terminal of a main chain of the polymer: whereinRrepresents a hydrogen atom and an alkyl group, andRrepresents a phenyl group, a carboxyl group, an alkoxycarbonyl group or a carboxamide group.

Method for producing compound having colorant structure at main chain terminal of polymer, and pigment dispersant, pigment composition, pigment dispersion and toner containing compound obtained by the production method

To provide an azo compound which improves the dispersibility of an azo pigment in a non-water soluble solvent. The purpose is achieved by an azo compound having a specific structure in which a high molecular weight polymer unit is bonded.

Compound having azo skeleton and pigment dispersant, pigment composition, pigment dispersion, and toner containing the compound

An object of the present invention is to provide an azo compound capable of improving the dispersibility of an azo pigment in a non-water-soluble solvent. The object of the present invention is achieved with an azo compound wherein a coloring matter moiety having a diketone azo structure and a polymer are bonded to each other.

Azo compound, pigment dispersant containing the azo compound, pigment composition, pigment dispersion and toner

A compound having a bisazo moiety and a polyester moiety is provided. The compound can be provided as a pigment dispersant to improve the dispersion of an azo pigment in a water-insoluble solvent.

Compound having bisazo dye skeleton, pigment composition containing the same, pigment dispersion, ink, and color filter resist composition

The present invention provides a toner that contains an azo pigment well-dispersed in a binder resin and has a satisfactory color tone. The toner contains toner particles each containing a binder resin and a colorant. Each of the toner particles contains a compound having a polyester moiety and a bisazo structure moiety. The colorant is the azo pigment.

Toner and method for manufacturing toner particles

The present invention aims to provide a novel undifferentiated state-control agent that maintains and/or improves an undifferentiated state of undifferentiated cells. CCL2 or a protein containing a functional domain thereof is used as the undifferentiated state-control agent. By culturing undifferentiated cells in the presence of the control agent, it is possible to maintain and/or improve an undifferentiated state of the undifferentiated cells. Examples of the undifferentiated cells include embryonic stem cells (ES cells) and induced pluripotent stem cells (iPS cells). The origin of the cells is not particularly limited, and may be a human, mouse, or the like, for example.

Control agent for controlling undifferentiated state and use thereof

Provided is a pigment dispersant for improving the dispersibility of an azo pigment for a water-insoluble solvent. More specifically, provided is a polyester, including at least one unit represented by one of the following formula (1) and the following formula (2): in the formula (1) and the formula (2): Rrepresents an alkyl group having 1 to 6 carbon atoms or a phenyl group; Rto Reach represent a hydrogen atom, a COORgroup, or a CONRRgroup, provided that at least one of the Rto Rrepresents the COORgroup or the CONRRgroup; and the Rto Reach represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

Polyester, pigment composition, and toner

An object of the present invention is to provide a pigment dispersant in which dispersibility of an azo pigment in a water-insoluble solvent is improved, and to provide an azo pigment composition in which the azo pigment has high dispersibility in a water-insoluble solvent. The present invention provides a compound used as a pigment dispersant and having a structure in which a specific bisazo skeleton unit bonds to a specific polymer resin unit.

Compound having bisazo skeleton, pigment dispersant containing the compound, pigment composition, pigment dispersion, ink and resist composition for color filter

A toner comprising toner particles, each of which contains a binder resin, a compound in which a polymer portion is bound to an azo skeleton structure, and a magenta pigment. The azo skeleton structure and a monomer unit of the polymer portion are represented by the following formulas (1) and (2), respectively: 

Magenta toner containing compound having AZO skeleton

A cyan toner comprising toner particles, each of which contains a binder resin, a compound in which a polymer portion is bound to an azo skeleton structure, and a phthalocyanine pigment serving as a colorant. The polymer portion of the compound has a monomer unit represented by formula (2) and is bound to a structure represented by formula (1);  

Cyan toner containing compound having azo skeleton

A toner comprising toner particles, each of which contains a binder resin, a compound in which a polymer portion is bound to an azo skeleton structure are linked, and carbon black. The polymer portion has a monomer unit represented by the Formula (2) that is bound to a structure represented by Formula (1): 

Black toner containing compound having azo skeleton

A compound that can improve azo pigment dispersibility in a non-water-soluble solvent. The compound is represented by formula (1): 

Azo compound, pigment dispersant containing the azo compound, pigment composition, pigment dispersion, and toner

An object of the present invention is to provide a toner having high dispersibility of an azo pigment in a binder resin and a good color tone, having suppressed image fogging and high transfer efficiency, and providing a stable image for a long time. The toner including toner base particles, each of which includes: at least a binder resin, a compound in which a specific bisazo skeleton unit bonds to a specific polymer resin unit, and an azo pigment as a colorant.

Toner including compound having bisazo skeleton

There is provided an azo compound for improvement in the dispersibility of an azo pigment into a water-insoluble solvent. The azo compound is represented by the following general formula (1): 

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Yokohama, Japan

Yuki Hasegawa