Canon Kabushiki Kaisha

Yuto Miyauchi

Minoru Nakamura

Kazuaki Nagaoka

Sosuke Yamaguchi

Takashi Koyanagi

Seiji Tsuru

A high-quality developing member having compatibility between high toner charging properties and high durability under high temperature and high humidity environments is provided. The developing member includes an electro-conductive substrate and an electro-conductive surface layer in this order. The surface layer includes a binder resin, an alumina particle and a polyester phosphate compound.

Developing member, process cartridge and electrophotographic image forming apparatus

Provided are a developer carrying member, and a process cartridge and an electrophotographic apparatus using the developer carrying member, the developer carrying member including a substrate, an elastic layer, and a surface layer covering a surface of the elastic layer in which the surface layer contains a modified acrylic resin, and the modified acrylic resin has a constituent unit represented by the following structural formula (1). (R1 represents an alkyl group having 1 to 3 carbon atoms; U represents a urethane resin having, between two adjacent urethane bonds, a structure represented by the following structural formula (2), and at least one of structure selected from a structure represented by the following structural formula (3) and a structure represented by the following structural formula (4); and L represents a divalent linking group containing an ester bond (&#x2014;O&#x2014;C(&#x2550;O)&#x2014;)). 

Developer carrying member, electrophotographic process cartridge, and electrophotographic image forming apparatus

There is provided a developing unit capable of suppressing a memory to leave on a developing roller even when held under high-temperature and high-humidity conditions for a long period of time before the start of use. The developing unit has a developing roller and a toner regulating member in contact with each other with resin particles therebetween. The resin particles have a toluene absorbency of 20 g or more and 50 g or less per 40 g of the resin particles and a Martens hardness of 1.0 N/mmor more and 50.0 N/mmor less.

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Mishima, Japan

Yuto Miyauchi