Canon Kabushiki Kaisha

Kosuke Mukumoto

Masashi Hirose

Takayuki Toyoda

Yasuaki Murai

Waka Hasegawa

Ayano Mashida

Chiaki Nishiura

Masanori Seki

Masashi Kawamura

Yuki Hasegawa

Yuki Tsujii

Osamu Matsushita

A compound that improves the dispersibility of pigments in non-water-soluble solvents is provided, the compound having a pigment dispersant, a pigment composition, a pigment dispersion, and a toner wherein the compound has a polymer and a monoazo compound having a certain structure binding to each other.

Compound having azo skeleton, pigment dispersant, pigment composition, pigment dispersion, and toner

The present invention provides a compound capable of improving the dispersibility of color pigments in a water-insoluble solvent; and a pigment-dispersing agent. The present invention also provides a pigment composition, a pigment dispersion, and a toner, which have satisfactory tinting strength. The present invention provides the compound containing a polymer having a monomer unit having a specific chemical structure, the compound having a moiety also having a specific structure.

Compound having azo skeleton structure, pigment-dispersing agent, pigment composition, pigment dispersion, and toner

A polymer including a unit having a phthalocyanine structure, the polymer having a high capability of dispersing pigments. A pigment composition, a pigment dispersion, and a toner all having a high tinting strength.

Polymer including phthalocyanine structure, method for producing the polymer, pigment composition, pigment dispersion, and toner

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

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Yokohama, Japan

Kosuke Mukumoto