Cleaning blade, cleaning device, process cartridge, and image forming apparatus

1. A cleaning blade comprising:

at least a portion which comes in contact with a member to be cleaned is configured of a member having dynamic ultra micro hardness of from 0.25 to 0.65 and an index K acquired in the following Equation (1) of equal to or more than 15:

index K= [23° C. breaking elongation (%)]×[10° C. impact resilience (%)]×(−1)×[tan δ peak temperature (° C.)]/[Young's modulus (MPa)]/1000.  Equation (1)

2. The cleaning blade according to claim 1 , comprising:

a contacting member that configures a region including at least a portion which comes in contact with the member to be cleaned; and

a non-contacting member that configures a region other than the contacting member, is configured of a material different from that of the contacting member, and has impact resilience at 50° C. of equal to or less than 70%.

3. The cleaning blade according to claim 2 , further comprising:

a contacting member that configures a region including at least a portion which comes in contact with the member to be cleaned; and

a non-contacting member that configures a region other than the contacting member, is configured of a material different from that of the contacting member, and has 100% permanent elongation of equal to or less than 1.0%.

4. The cleaning blade according to claim 1 , further comprising:

a contacting member that configures a region including at least a portion which comes in contact with the member to be cleaned; and

a non-contacting member that configures a region other than the contacting member, is configured of a material different from that of the contacting member, and has 100% permanent elongation of equal to or less than 1.0%.

5. A cleaning device comprising the cleaning blade according to claim 1 .

6. A process cartridge comprising:

the cleaning device according to claim 5 ,

wherein the process cartridge is detachable from an image forming apparatus.

7. An image forming apparatus comprising:

an image holding member;

a charging device that charges the image holding member;

an electrostatic latent image forming device that forms an electrostatic latent image on a surface of a charged image holding member;

a developing device that develops the electrostatic latent image formed on the surface of the image holding member with toner to form a toner image;

a transfer device that transfers the toner image formed on the image holding member on a recording medium; and

the cleaning device according to claim 5 that brings the cleaning blade into contact with the surface of the image holding member after the transfer of the toner image by the transfer device for cleaning.