Sumitomo Riko Company Limited

Shinkichi Kashihara

Takeru Horiuchi

Yoshihiro Saito

Yosuke Hayashi

Satoshi Tatsumi

Koji Morihara

Naoki Akira

Junichiro Suenaga

Minobu Iinuma

Akitoshi Morita

Provided is a charging roll for electrophotographic equipment with which any increase in resistance and any bleeding of ionic electroconductive agent while energization persists can be minimized. A charging rollfor electrophotographic equipment, the charging rollcomprising a shaft bodyand an elastic layerthat is formed on the outer peripheral surface of the shaft body, the elastic layerbeing a crosslinked article of a rubber composition containing the following components (a) to (e). (a) One or more selected from hydrin rubber and nitrile rubber, (b) a crosslinking agent, (c) an ionic electroconductive agent, (d) one or more selected from piperidinyloxy radical compounds and phenolic antioxidants, and (e) one or more selected from salts of cyclic amidine compounds and thiophthalimide compounds.

Charging roll for electrophotographic equipment

Provided is a conductive roll for an electrophotographic machine. The conductive roll is a charging roll and includes a shaft body, and an elastic body layer formed on an outer periphery of the shaft body. The elastic body layer is a crosslinked body of a composition containing a diene-based polymer (a), a sulfur or peroxide crosslinking agent (b), carbon black (c), and a coupling agent (d). (c) has a specific surface area of 40 to 300 m/g. (d) is a coupling agent having a NHRgroup and a SSOH group, or a coupling agent having a NHRgroup and an ene structure (where Ris H or a hydrocarbon group having 1 to 8 carbon atoms). The contents of (c) and (d) in the composition are respectively 10 to 45 parts by mass and 0.5 to 20 parts by mass with respect to 100 parts by mass of (a).

Conductive roll for electrophotographic machine

The present disclosure provides a charging member for electrophotographic equipment capable of providing constant and excellent uniform chargeability over a long period of time from low-temperature and low-humidity through high-temperature and high-humidity environments, while suppressing bleeding. A charging member for electrophotographic equipment includes an elastic layer and a surface layer formed around the elastic layer. The elastic layer includes the following (a) through (c): (a) an ion conducting agent that is solid at room temperature; (b) an ion conducting agent that is liquid at room temperature; and (c) an electron conducting agent with an average grain diameter of 25 to 90 nm and a DBP absorption of 152 ml/100 g or below.

Charging member for electrophotographic equipment

A charging member for an electrophotographic apparatus in which image defects caused by bleeding of an ion-conductive agent are suppressed and excellent chargeability can be maintained. In a charging member for an electrophotographic apparatus including a base layer composed of a conductive rubber elastomer and a surface layer, the base layer is a cross-linked body of a conductive rubber composition containing (a) a cross-linkable rubber, (b) a cross-linking agent, (c) an ion-conductive agent represented by a general formula (1) below, and (d) carbon black. Here, Rand Rare allyl groups, Ris a methyl group or an ethyl group, and Ris a linear alkyl group having a carbon number of 6-8. Xis a sulfonate anion having a fluorine atom or a bis(sulfonyl) imide anion having a fluorine atom.

Charging member for electrophotographic apparatus

The object of the present invention is to provide a conductive roll having high resistance to permanent set and high resistance to adhesion. The conductive rollhas a rubber elastic portion formed of a rubber material including a carbon-carbon double bond and exhibiting electric conductivity. The surface of the rubber elastic portion is exposed as the surface of the roll. An organic group including one or more groups selected from silicone groups and fluorine-containing groups is bonded through an isocyanuric acid skeleton to the surface of the rubber elastic portion. The organic group may be a group derived from an organic compound including one or more groups selected from silicone groups and fluorine-containing groups and having a carbon-carbon double bond.

Growing community of inventors

Aichi, Japan

Shinkichi Kashihara