Sumitomo Riko Company Limited

Kentaro Imai

Masanori Ishida

Yosuke Hayashi

Satoshi Tatsumi

Kosuke Minematsu

Yutaka Kadoshima

Kadai Takeyama

Kazushi Yamaguchi

Kazuhiro Iida

Toshihiko Arata

Satoshi Endo

Shuichi Egawa

Kengo Fujii

Fumio Misumi

Atsushi Ozaki

Masanori Satou

Keiichi Inoue

The disclosure provides a development roll for electrophotographic apparatuses. The development roll for electrophotographic apparatuses includes: a shaft; an elastic layer formed on an outer circumferential surface of the shaft; a surface layer formed on an outer circumferential surface of the elastic layer; and an end protection layer formed on an outer circumferential surface of the surface layer at both ends in an axial direction. The end protection layer contains a binder polymer and a surface modification agent that has a cyano group.

Development roll for electrophotographic apparatuses

Provided is a development roll for electrophotography devices in which image defects are suppressed and which achieve both maintenance of high charging properties and discharging properties. The development roll is provided with a shaft member, an elastic substance layer formed on the outer circumference of the shaft member, an intermediate layer formed on the outer circumference of the elastic substance layer, and a surface layer formed on the outer circumference of the intermediate layer. The volume resistivity of the surface layeris within the range of 1.0&#xd7;10to 1.0&#xd7;10&#x3a9;&#xb7;cm, and the volume resistivity of the intermediate layeris within the range of 1.0&#xd7;10to 1.0&#xd7;10&#x3a9;&#xb7;cm.

Development roll for electrophotography device

Provided is a developing roll (R) with which it is possible to suppress toner stress in a low-temperature and low-humidity environment. A developing roll (R) for an electrophotographic device has a surface layer (). In a surface hardness histogram () of the surface layer () measured by using an atomic force microscope (AFM), the surface hardness (H) at the top peak (P) is in the range of 10-55 MPa, and the area ratio (S) of the histogram portion corresponding to a surface hardness of 45 MPa or below in relation to the entire histogram is 65% or above.

Developing roll

An electrophotographic device member R is used in an electrophotographic device. The electrophotographic device member R has a surface layer. The surface layerhas a matrix polymerforming a skeleton of the surface layerand a surface modifiercontained in the matrix polymer. The surface modifieris composed of a copolymer containing, in its molecule, a first polymerization unit derived from a (meth)acrylate having a silicone groupand a second polymerization unit derived from a (meth)acrylate having a fluorine-containing group

Electrophotographic device member

An electrophotographic device member can be configured as a roll member, a blade member, a belt memberor the like, and a modified rubber elastic bodyis used as a material for a portion including the surfaces of the respective members. The modified rubber elastic bodyhas a rubber elastic bodyhaving rubber elasticity and a surface-treated layercomposed of a cured product of photocurable composition impregnated into the rubber elastic bodyfrom the surface thereof. The photocurable composition is configured to include a (meth)acryl monomer, a photopolymerizable polymer having a silicone group and/or a fluorine-containing group and a (meth)acryloyl group in a molecule, and a photopolymerization initiator.

Growing community of inventors

Aichi, Japan

Kentaro Imai