Canon Kabushiki Kaisha

Ako Kusakari

Tetsuya Yano

Takashi Kenmoku

Tatsuki Fukui

Chieko Mihara

Norikazu Fujimoto

Tsutomu Honma

Shinya Kozaki

Takeshi Ikeda

Atsushi Tani

Masato Minami

Akiko Tominaga

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

To provide: a charge control agent having negative chargeability, which contributes to environmental conservation and the like to an increased degree, has high performance (high charge amount, quick rise-up of charge, excellent stability with time, and high environmental stability), and has improved dispersibility; a toner for developing an electrostatic charge image containing the charge control agent; and an image forming method and an image forming apparatus each using the toner for developing an electrostatic charge image. A charge control agent for controlling a charged state of powder, characterized by including one or more units each represented by the following chemical formula (1) in a molecule. 

Charge control agent, toner, image forming method, and image forming apparatus

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 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

The invention provides a novel polyester adapted for use in a charge control agent for a toner for an electrophotographic process, having a charge stability, a high charge amount, an improved dispersibility and a biodegradability, and a producing method and an application technology therefore. According to the invention, there is provided polyhydroxyalkanoate comprising at least one unit represented by the following chemical formula in a molecule:&#x2014;(O&#x2014;CH(&#x2014;(CH)&#x2014;CH-p-CH&#x2014;CONH-ASOR)CHCO)&#x2014;(wherein Rrepresents OH, a halogen atom, ONa, OK or OR; Aand Reach represents a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic cyclic structure or a substituted or unsubstituted heterocyclic structure; m represents an integer selected from a range of 0 to 7; and R, A, Rand m have the aforementioned meanings independently for each unit when plural units are present), a charge control agent containing such polyhydroxyalkanoate, a toner utilizing such charge control agent, and an image forming method and an image forming apparatus utilizing such toner.

Polyhydroxyalkanoate having amide, sulfonic acid or sulfonate ester group, charge control agent and toner

The invention is to provide a novel polyhydroxyalkanoate having a reactive functional group within a molecule, a novel polyhydroxyalkanoate having a novel function by a chemical modification of the polyhydroxyalkanoate having the reactive functional group, and a producing method therefor. A polyhydroxyalkanoate containing a unit having a carboxyl group in a side chain is utilized for deriving a polyhydroxyalkanoate containing a unit having an amide group and a sulfonic acid group in the molecule.

Polyhydroxyalkanoic acid having ester, carboxyl or sulfonic acid group, and producing method therefor

The invention is to provide a novel polyhydroxyalkanoate having a reactive function group within the molecule and a producing method therefor In a polyhydroxyalkanoate containing a unit having a vinyl group in a side chain, such vinyl group is utilized for deriving a polyhydroxyalkanoate comprising a carboxyl group or a unit having an amide group and a sulfonic acid group.

Polyhydroxyalkanoic acid having vinyl, ester, carboxyl or sulfonic acid group and producing method therefor

A novel polyhydroxyalkanoate having a reactive functional group in a molecule and a method of producing the same; and a novel polyhydroxyalkanoate having a new function obtained by chemically modifying the polyhydroxyalkanoate having a reactive functional group and a method of producing the same. A polyhydroxyalkanoate containing units having a carboxyl group, an amide group, and a sulfonic group in a molecule is induced.

Polyhydroxyalkanoate having ester group, carboxyl group, and sulfonic group, and method of producing the same

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

To provide a novel polyhydroxyalkanoate having a reactive functional group in a molecule and a method of producing the same; and a novel polyhydroxyalkanoate having a new function obtained by chemically modifying the polyhydroxyalkanoate having a reactive functional group and a method of producing the same. By utilizing a vinyl group of a polyhydroxyalkanoate containing a unit having the vinyl group at a side chain thereof, a polyhydroxyalkanoate containing units having a carboxyl group, an amide group, and a sulfonic group in a molecule is induced.

Polyhydroxyalkanoate having vinyl group, ester group, carboxyl group, and sulfonic group, and method of producing the same

A novel polyhydroxyalkanoate having a reactive functional group in a molecule, and a production method thereof, etc. are provided. By utilizing the vinyl group of polyhydroxyalkanoate which contains a unit having a vinyl group on a side chain, a polyhydroxyalkanoate which contains a carboxyl group and a unit having an amide group and a sulfonic acid group in a molecule is derived.

Polyhydroxyalkanoate having vinyl group, ester group, carboxyl group and sulfonic acid group, and production method thereof

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

A polyhydroxyalkanoate containing in a molecule at least one unit represented by the chemical formula (1). The polyhydroxyalkanoate is a biodegradable plastic with enhanced melt-processability and exhibits excellent charging stability, high chargeability, and enhanced dispersibility when used as a charge control agent of a toner in an electrophotographic process. 

Polyhydroxyalkanoate containing amide group, sulfonic group, and sulfonate ester group, method for producing the same, and charge control agent, toner, image forming method, and image forming apparatus

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Tokyo, Japan

Ako Kusakari