| 摘要 |
A two-component developer composition comprised of a toner of a polyester resin of general formula <IMAGE> where R is a substituted or unsubstituted alkylene radical having from 2 to 12 carbon atoms, an alkylidene radical having from 1 to 12 carbon atoms, or a cycloalkylidene radical having from 3 to 12 carbon atoms; R' and R'' are substituted or unsubstituted alkylene radicals having from 2 to 12 carbon atoms, alkylene arylene radicals having from 8 to 12 carbon atoms and arylene radicals; X and X' hydrogen or alkyl radical having from 1 to 4 carbon atoms and n is a number from 0 to 4, and magnetic particles (specifically magnetite) in an amount of from about 20 percent to about 50 percent by weight, and a carrier material (particularly coated steel), which developer composition, when utilized in a xerographic apparatus, allows the production of high-quality images over a substantial period of time while simultaneously eliminating any cleaning problems and contamination of the machine components. |
