A developer roller which is semiconductive comprising a rubber body containing {HEAD ~ soyadimethylethyl ammonium ethosulfate} in {TAIL ~ an amount} of between 0.5 phr to 4.0 phr by weight of said rubber, blended therein to increase conductivity of said body 
A developer roller which is semiconductive comprising a rubber body containing { HEAD ~ soyadimethylethyl ammonium ethosulfate } in { TAIL ~ an amount } of between 0.5 phr to 4.0 phr by weight of said rubber , blended therein to increase conductivity of said body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH