Bridgestone Corporation

Kouji Takagi

Kazuya Murata

Toshiaki Arai

Takao Ohuchi

There is disclosed a rubber composition comprising (A) butadiene rubber and/or (B) isoprene rubber in the form of liquid and (C) silicone rubber at a &lcub;(A)&plus;(B)&rcub;/(C) ratio by weight in the range of 97/3 to 5/95. The composition is capable of affording an elastic member which has a low hardness and excellent wear resistance, and which is well suited for use in a variety of part items that are installed in an image formation apparatus such as an electrophotographic apparatus and an electrostatic recording apparatus, including copying machinery, printers, facsimile apparatus and the like, in particular a developing roller. There are also disclosed a developing roller which comprises the above rubber composition, is improved in wear resistance for a developer without causing high hardness thereof, and is capable of affording a steadily favorable image without fail for a long period of time; and further a developing apparatus which comprises the above developing roller.

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Kanagawa, Japan

Kouji Takagi