Patent ID: 8503911

Claim:
A charging member for an electrophotographic apparatus, comprising: an electro-conductive support; an electro-conductive elastic layer; and a surface layer, wherein: the surface layer comprises a polymer compound having an Si—O—Ti linkage in a molecular structure thereof; and the polymer compound has constitutional units represented by the following formulae (1), (2), and (3): in the formulae (1) and (3), R 1-1 , R 2-1 , R 1-2 , and R 2-2 each independently represent any one of structures represented by the following formulae (4) to (7), and in the formula (3), Rα represents any one of structures represented by the following formulae (8) to (12): in the formulae (4) to (7): R 3 to R 7 , R 10 to R 14 , R 19 , R 20 , R 25 , and R 26 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, a hydroxyl group, a carboxyl group, or an amino group; R 8 , R 9 , R 15 to R 18 , R 23 , R 24 , and R 29 to R 32 each independently represent a hydrogen atom, or an alkyl group having 1 or more and 4 or less carbon atoms, and R 21 , R 22 , R 27 , and R 28 each independently represent a hydrogen atom, an alkoxy group having 1 or more and 4 or less carbon atoms, or an alkyl group having 1 or more and 4 or less carbon atoms; n1, m1, q1, s1, t1, and u1 each independently represent an integer of 1 or more and 8 or less, and p1 and r1 each independently represent an integer of 4 or more and 12 or less; x1 and y1 each independently represent 0 or 1; a symbol “*” represents a site to be bonded to a silicon atom in the formula (1), a site to be bonded to a silicon atom in the formula (3), or a site to be bonded to any one of the structures represented by the following formulae (8) to (12) as Rα in the formula (3); and a symbol “**” represents a site to be bonded to an oxygen atom in each of the formula (1) and the formula (3): in the formulae (8) to (12): R 33 to R 37 each independently represent an alkylene group having 1 or more and 6 or less carbon atoms, or a hydrocarbon group partially substituted with an ether group; a to e each independently represent an integer of 1 or more and 1,350 or less; and a symbol “*” represents a site to be bonded to the symbol “*” in any one of the structures represented by the formulae (4) to (7) as R 2-2 in the formula (3).