Patent ID: 8805244

Claim:
A charging member, comprising: a substrate; and an outermost layer that is on the substrate, is in contact with a member to be charged, and contains a cross-linking fluorocarbon siloxane rubber composition, wherein the charging member charges the member to be charged by being brought into contact with the member to be charged while a voltage is applied, and the cross-linking fluorocarbon siloxane rubber composition comprises: (A) a fluorocarbon polymer having an aliphatic unsaturated group and mainly composed of fluorocarbon siloxane represented by the structural formula (1), (3), or (4) below; (B) organopolysiloxane and/or fluorocarbon siloxane having two or more silyl groups per molecule, the molar amount of the silyl groups being 1 to 4 times the molar amount of the aliphatic unsaturated group in the fluorocarbon polymer; (C) a filler; and (D) a catalyst, where in the structural formula (I): R 10 represents an unsubstituted or substituted monovalent hydrocarbon group, a and e each independently represent 0 or 1, b and d each independently represent an integer of 1 to 4, c represents an integer of 0 to 8, and x represents an integer of 1 or more, CH 2 ═CH—(X) p -Rf′—(X′) p -CH═CH 2 (3) CH 2 ═CH—(X) p -Q-Rf′-Q-(X′) p -CH═CH 2 (4) where in the structural formulas (3) and (4): X is —CH 2 —, —CH 2 O—, —CH 2 OCH 2 —, or —Y—NR—CO—, wherein Y is —CH 2 — or a group represented by the structural formula (5A) below and R is a hydrogen atom, a methyl group, a phenyl group, or an allyl group, X′ is —CH 2 —, —OCH 2 —, —CH 2 OCH 2 —, or —CO—NR′—Y′—, wherein Y′ is —CH 2 — or a group represented by the structural formula (5B) below and R′ is a hydrogen atom, a methyl group, a phenyl group, or an allyl group, Rf′ has a divalent perfluoropolyether structure, p is independently 0 or 1, and Q is a divalent hydrocarbon group with 1 to 15 carbon atoms that may have an ether linkage.