A developer roller which is semiconductive comprising a rubber body containing {HEAD ~ soyadimethylethyl ammonium ethosulfate} in an amount of between 0.5 phr to 4.0 phr by {TAIL ~ 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 an amount of between 0.5 phr to 4.0 phr by { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH