Electrophotographic cleaning blade, process cartridge, and electrophotographic image forming apparatus

Abstract

Provided is a cleaning blade including: an elastic member containing a polyurethane; and a supporting member configured to support the elastic member. The polyurethane has a linear moiety represented by —(CH)m-. The elastic member has a plate shape having a main surface and a distal end surface forming a distal end-side edge with the main surface, at least on a distal end side. Martens hardness at positions on a bisector at intervals of 30 μm from a distal end-side edge to a position furthest away from the distal end-side edge by 100 μm decreases from a distal end-side edge to the position. A Martens hardness HM1 of the elastic member at a position P1 is 1.0 N/mmor more. The elastic layer satisfies Kω>Kω>Kω. Further, the cleaning blade has an erosion rate E of 0.6 μm/g or less.