Canon Kabushiki Kaisha

Ayano Mashida

Waka Hasegawa

Masashi Hirose

Takayuki Toyoda

Yasuaki Murai

Chiaki Nishiura

Masanori Seki

Masashi Kawamura

Junji Ito

Yasuhiro Aichi

Ryo Natori

Jun Shirakawa

Yuki Hasegawa

Yuki Tsujii

Taiki Watanabe

Kosuke Mukumoto

Akihiro Taya

Masanobu Ootsuka

Osamu Matsushita

Yutaka Yoshimasa

Kousuke Mukumoto

A thermosensitive recording mediumincludes a support, and a first thermosensitive coloring layer, a first intermediate layer, and a second thermosensitive coloring layerdisposed on the supportin descending order of distance from the support. The first thermosensitive coloring layerand the second thermosensitive coloring layereach contain an electron-donating dye precursor, an electron-accepting compound, a radical-polymerizable compound, and a photoradical polymerization initiator, and the first intermediate layercontains a UV absorber.

Thermosensitive recording medium and image forming method

Provided is a liquid developer containing a carrier liquid with an SP value of not more than 8.20, a toner particle that is insoluble in the carrier liquid, and a toner particle dispersing agent, wherein the toner particle contains a polyester resin with an acid value of from 5 mg KOH/g to 50 mg KOH/g, a number-average molecular weight of the polyester resin is from 3,500 to 20,000, the toner particle dispersing agent is a polymer having a primary amino group, an amine value of the polymer having the primary amino group is from 30 mg KOH/g to 200 mg KOH/g, and a ratio of a total number of acid groups in the polyester resin relative to a total number of amino groups in the polymer having the primary amino group is from 1.0 to 10.0.

Liquid developer and method for manufacturing liquid developer

A liquid developer comprising a carrier liquid, a toner particle insoluble in the carrier liquid, and a polymer having a primary amino group and soluble in the carrier liquid, wherein the toner particle comprises a polyester resin having an acidic group, an acid value of the polyester resin is at least 5 mg KOH/g, a pKa of the acidic group is not more than 3.4, and the polymer having a primary amino group has a primary amino group at a position other than the end of a main chain of the polymer, and method of producing thereof.

Liquid developer and method of producing liquid developer

A method for producing a liquid developer, the method including a step of producing a toner particle by applying a shear force to a mixture of a polyester resin A and B, and a toner particle dispersing agent in a liquid a, wherein the polyester resin A has a number-average molecular weight from 3,000 to 7,000, an acid value of at least 5, and a carboxy group; the polyester resin B has a number-average molecular weight from 4,000 to 20,000 and an acid value of not more than 2; the toner particle dispersing agent has a primary amino group and an amine value of at least 40; the mass ratio (B/(A+B)) for the polyester resin B is 0.3 to 0.9; and the following relationship is satisfied: SP value of liquid a&#x3c;SP value of the toner particle dispersing agent&#x3c;SP value of polyester resin B.

Method for producing liquid developer

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 curable liquid developer production method that can efficiently produce a curable liquid developer is provided. A curable liquid developer is also provided. The method is a method of producing a curable liquid developer containing a pigment, a binder resin, a toner particle dispersing agent, and a curable insulating liquid, this method including: a pigment dispersion step of preparing a pigment dispersion containing a pigment, a binder resin, a toner particle dispersing agent, and a solvent; a mixing step of mixing the pigment dispersion with a curable insulating liquid; and a distillative removal step of distillatively removing the solvent from a mixture obtained in the mixing step.

Method of producing curable liquid developer and curable liquid developer

The ultraviolet-curable liquid developer contains a hydrophobic cationically polymerizable liquid monomer, a photopolymerization initiator, a toner particle insoluble in the liquid monomer, and a toner particle dispersing agent, wherein the toner particle contains a binder resin that has an acid value of at least 5 mg KOH/g; the toner particle dispersing agent is a polymer that contains at least both a monomer unit represented by general formula (1) and a monomer unit represented by general formula (2); and the toner particle dispersing agent has a monomer unit represented by general formula (1) at a position other than the terminal position.

Ultraviolet-curable liquid developer and method of producing same

A curable liquid developer containing a curable insulating liquid and a toner particle that contains a pigment and a resin, wherein the viscosity of the curable insulating liquid at 25&#xb0; C. is at least 1 mPa&#xb7;s and not more than 100 mPa&#xb7;s, and when A (mPa&#xb7;s) is the viscosity of the curable liquid developer at 25&#xb0; C. in a case where the toner particle concentration in the curable liquid developer is 50 mass %, and B (mPa&#xb7;s) is the viscosity of the curable liquid developer at 25&#xb0; C. in a case where the toner particle concentration in the curable liquid developer is 1 mass %, the value of A&#x2212;B is not more than 1,000 mPa&#xb7;s.

Curable liquid developer and image-forming method using curable liquid developer

The present invention provides a compound and a pigment dispersant, each of which improves the dispersibility of various types of pigments in a non-aqueous solvent and also provides a pigment composition, a pigment dispersion, and a toner, each of which has a preferable coloring power. The compound includes a polymer which has a monomer unit having a specific structure and also includes a specific partial structure.

Compound having azo skeleton structure, pigment dispersant, 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 is a method of producing a liquid developer containing a dispersing agent, an insulating liquid (a), and a toner particle that contains a colorant and a binder resin, the method including a step (1) of preparing a mixture containing the colorant, the binder resin, the insulating liquid (a), a solvent (b), and the dispersing agent, and a step (2) of distillatively removing the solvent (b) from the mixture, wherein the binder resin dissolves in the solvent (b) and does not dissolve in the insulating liquid (a), the dispersing agent dissolves in both the insulating liquid (a) and the solvent (b), and the binder resin contains a polymer A that has an alkali metal sulfonate group or an alkaline-earth metal sulfonate group.

Method of producing liquid developer

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

The present invention provides a compound capable of improving the dispersibility of yellow, magenta, cyan, and black 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 relates to a compound having a structure in which an azo skeleton structure is bound to a polymer portion via a linking group in the azo skeleton structure.

A pigment dispersion containing a pigment, a non-water-soluble solvent, a compound in which an specific azo skeleton structure is bonded to a specific polymer having a monomer unit given, and a polymer compound having a monomer unit that contains a structure selected from the partial structures given by the specific formulas (3) and (4).

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Kawasaki, Japan

Ayano Mashida