Development system coatings.

摘要

A coated toner transport roll consisting of a core with a coating of charge transporting monomers (I) dispersed in a binder and an oxidising agent selected from ferric chloride and trifluoroacetic acid present in an amt. of 1-50, esp. 2-15 wt.%, the coating having a relaxation time of ca. 0.0099 millisecond to 3.5 milliseconds and a residual voltage of ca. 1-10 volts. Pref. the coating is 3-50 microns thick and the (I) is an aryldiamine of formula (I), in which X, Y and Z are H, 1-25C alkyl or halogen and at least one of X, Y and Z is independently chosen from alkyl and halogen, dispersed in a polyethercarbonate binder. Pref. the transport roll has a vol. electrical resistivity of ca. 10 power(9) ohm-cm to 10 power(11) ohm-cm and a dielectric constant of 3-5.