Canon Kabushiki Kaisha

Norikazu Fujimoto

Tetsuya Yano

Takashi Kenmoku

Tatsuki Fukui

Atsushi Tani

Hitoshi Itabashi

Ako Kusakari

Chieko Mihara

Takeshi Ikeda

Takeshi Miyazaki

Takayuki Toyoda

Yasuaki Murai

Masato Minami

Manabu Ohno

Masayoshi Kato

Yasushi Katsuta

Emi Tosaka

Akiko Tominaga

Motoya Fukushima

Yasukazu Ayaki

Shigeto Tamura

The method of producing polymerized toner, the method including: dispersing a polymerizable monomer composition containing at least a polymerizable monomer and a colorant in an aqueous medium; and polymerizing the polymerizable monomer in the aqueous medium with a polymerization initiator to produce toner particles, and is characterized in that a polymerization initiator which has a specific structure and the hydrogen bond dissociation energies of which satisfy specific relationships is used as the polymerization initiator.

Method of producing polymerized toner, method of producing binder resin for toner, and toner

A resin for toner containing a resin component having both a polyester unit produced by polycondensation of a polyhydric alcohol component and a polycarboxylic acid component, and an aryl group having a sulfonic ester group as a substituent; and a toner that contains the resin for toner.

Resin for toner and toner

The present invention provides a method for producing a toner that can suppress the production of the decomposition products derived from a polymerization initiator, and can suppress the remaining presence, in the toner particles, of the unreacted polymerizable monomer and decomposition product residues. On the basis of this method, the present invention provides a toner that is excellent in triboelectric charging stability and can yield stable images over a long term. The present invention provides a method for producing a polymerized toner including a step of producing a polymerized toner particle by dispersing in an aqueous medium a polymerizable monomer composition including at least a polymerizable monomer and a colorant and by polymerizing the polymerizable monomer by using a polymerization initiator in the aqueous medium, the method being characterized in that the polymerization initiator has a structure represented by the following General Formula: (wherein Rand Reach independently represent an optionally branched or substituted aliphatic hydrocarbon group having 1 to 6 carbon atoms, and Rrepresents an optionally branched aliphatic hydrocarbon group having 3 to 12 carbon atoms).

Method for producing polymerized toner, polymerized toner, method for producing binder resin for toner and binder resin for toner

A polymer is provided in which a sulfonic group or a derivative thereof is introduced. The polymer includes a unit represented by the following chemical formula (1): 

Polymer having a sulfonic group or a sulfonate group and an amide group and method of producing same

A charge controlling agent is provided as a compound in which an amide group is introduced together with a sulfonic group or a derivative thereof. The charge controlling agent is characterized by including at least one compound represented by the chemical formula (2) in which an amide group is introduced together with at least one of a sulfonic group, a sulfonic acid ester, a sulfonic acid salt, and a sulfonic acid halide.

Charge controlling agent and toner

Provided are a novel polymer having a sulfonic group, a sulfonic acid ester group, or a derivative thereof incorporated therein, a method of producing the polymer, and a novel compound suitable for producing the polymer. A polymer is characterized by containing a unit represented by the following formula (1): wherein Rand Rare each independently a halogen atom or a hydrogen atom, Ris a CHgroup or a hydrogen atom, and any one of R, R, and Ris a sulfonate group represented by SOR.

Polymer, charge control agent, and toner for developing electrostatic latent images

There is provided a polymer including a unit represented by Chemical Formula (1): wherein R represents -A-SOR; Rand Rare each independently a halogen atom or a hydrogen atom; Ris a CHgroup, a halogen atom or a hydrogen atom; Ais a substituted or unsubstituted aromatic ring structure or a substituted or unsubstituted heterocyclic structure; Ais a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure or a substituted or unsubstituted heterocyclic structure; Ris OH, a halogen atom, ONa, OK or OR; Ris a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure or a substituted or unsubstituted heterocyclic structure.

Polymer having sulfonic acid group or sulfonic acid ester group and amide group, and toner for developing electrostatic latent image having the polymer

A polymer is provided in which a sulfonic group or a derivative thereof is introduced. The polymer includes a unit represented by the following chemical formula (1): wherein R represents -A-SOR; Ais selected from an alkylene group, a heterocyclic ring, an aromatic ring; and &#x2014;SORis a sulfonic group or of a derivative of a sulfonic acid. 

A charge control resin containing a copolymer which has a unit having a sulfonic acid ester group having a specific structure and has the unit in specific proportions. The charge control resin can provide a toner with superior charging performance. Also disclosed is a toner having such a charge control resin.

Charge control resin, and toner

A developer carrying member is disclosed which can prevent a toner from being excessively charged in a developing assembly while keeping the charge quantity of the toner at a somewhat higher level, and seldomly causes toner melt adhesion to the developer carrying member. The developer carrying member contains a polymer having a unit represented by the chemical formula (1): 

Developer carrying member, and developing assembly

To provide a resin-coated carrier for an electrophotographic developer capable of providing an image with excellent image quality; and a two-component developer and a replenishing developer each of which contains the resin-coated carrier as a constituent. A resin-coated carrier for an electrophotographic developer, including: a core; and a resin coating layer containing a polyhydroxyalkanoate containing one or more units each represented by the following chemical formula (1) in a molecule, the resin coating layer being placed on the core: 

Resin-coated carrier for electrophotographic developer

There is provided a resin-coated carrier with a coating layer attached to the surface of a core material in a stable manner, the electrophotographic carrier which can provide an image with excellent quality. The resin-coated carrier of the present invention comprises a resin-coating layer comprising, on a core material, a polymer comprising a unit represented by the formula (1): 

Carrier for electrophotographic developer

The toner having a significantly improved dispersibility of a colorant in toner particles is provided. The present invention provides a dry toner comprising: (i) a binder resin; (ii) a colorant; (iii) at least one of metallophthalocyanine and a metallophthalocyanine derivative having a central metal selected from the group consisting of Cr, Fe, Co, Ni, Zn, Mn, Mg, and Al; and (iv) a polymer containing 0.5 to 20% by mass of a base unit derived from a specific polymerizable monomer having an amide group.

Dry toner, method for producing dry toner, and method for forming an image

A cyan toner is provided which is brighter and more greenish in hue than conventional cyan toners and highly translucency. A cyan toner characterized by comprising toner particles at least having a coloring compound represented by the Formula (1): 

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Susono, Japan

Norikazu Fujimoto