Canon Kabushiki Kaisha

Jun Shirakawa

Junji Ito

Yasuhiro Aichi

Waka Hasegawa

Ayano Mashida

Ryo Natori

Hiroshi Tanabe

Akio Maruyama

Yukio Nagase

Kei Inoue

External additive particles including a polymer containing a sulfur atom and a nitrogen atom, wherein the polymer includes a vinyl polymer moiety and a siloxane moiety, relative to a total number of carbon atoms, oxygen atoms, and silicon atoms constituting the external additive particles, a ratio of a number of the silicon atoms constituting the external additive particles is 4.0% or more and 25.0% or less, and in surfaces of the external additive particles analyzed by X-ray photoelectron spectroscopy, relative to a total number of carbon atoms, nitrogen atoms, oxygen atoms, silicon atoms, and sulfur atoms, a ratio of a number of the nitrogen atoms is 0.40% or more and 2.50% or less, and a ratio of a number of the sulfur atoms is 0.05% or more and 0.25% or less.

External additive particles, toner, and method for producing external additive particles

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

Provided is a liquid developer that gives a high image density, has a high resistance, suppresses the appearance of image blurring, can be reused, is readily cured by ultraviolet radiation, and can accommodate higher process speeds. This liquid developer contains a carrier liquid, a toner particle insoluble in the carrier liquid, and a compound with the following formula (1) [In formula (1), Rand Reach independently represent an alkyl group having at least 13 and not more than 23 carbons.].

Liquid developer and method of producing same

A curable liquid developer that contains a toner particle, a polymerization initiator, and a cationically polymerizable liquid monomer, wherein the cationically polymerizable liquid monomer contains a compound given by the following formula (A):(R&#x2014;CH&#x2550;CH&#x2014;O&#x2014;)&#x2014;CH&#x2003;&#x2003;formula (A)[in formula (A), m represents an integer that is at least 12 and not more than 50; n represents an integer that is at least 2; and R represents a hydrogen atom or an alkyl group having at least 1 and not more than 3 carbons].

Curable liquid developer having a cationically polymerizable liquid monomer with a monofunctional vinyl ether compound

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

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.

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Kawaguchi, Japan

Jun Shirakawa