| 摘要 |
The invention provides an electrically conductive rubber material used for electrophotographic copying apparatus to prevent bleeding and blooming so as to obtain a image of high quality. The electrically conductive rubber material comprises a diene type rubber and a rubber which contains no double bond in its principal chain, the rubber being cross-linked with a metallic salt cross-linking, a portion of the diene type rubber being butadiene rubber, the proportion of the butadiene rubber to the total parts by weight of rubber being 10 - 30 parts by weight, the proportion of the rubber containing no double bond in its principal chain to the total parts by weight of rubber being not less than 15 parts by weight, 5 - 100 parts by weight of carbon black per 100 parts by weight of rubber being added to serve as an electrlcal conductivity imparting agent, and not more than 3 parts by weight of oil ingredient of a softening agent, plasticizer and the like per 100 parts by weight of rubber in accordance with solvent extraction by acetone. In addition, the rubber containing no double bond in its principal chain is EPDM rubber. |
