| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging member capable of maintaining excellent properties even after repeated use in a high humidity environment, and a process cartridge and an electrophotographic apparatus having the charging member. SOLUTION: The charging member has a surface layer containing a polysiloxane having a first unit represented by SiO<SB>0.5</SB>R<SP>1</SP>(OR<SP>2</SP>)(OR<SP>3</SP>), a second unit represented by SiO<SB>1.0</SB>R<SP>4</SP>(OR<SP>5</SP>) and a third unit represented by SiO<SB>1.5</SB>R<SP>6</SP>, wherein when the mol numbers of the first, second and third units in the polysiloxane are represented by x [mol], y [mol] and z [mol], respectively, a relationship of 0.60≤ä(x+y)/(x+y+z)}≤0.80 is satisfied. In the above formulae, R<SP>1</SP>, R<SP>4</SP>and R<SP>6</SP>each independently denote a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; and R<SP>2</SP>, R<SP>3</SP>and R<SP>5</SP>each independently denote H or a substituted or unsubstituted alkyl group. COPYRIGHT: (C)2007,JPO&INPIT
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