Electrographic toner and developer composition containing quaternary ammonium salt charge-control agent

摘要

The present invention relates to the use of quaternary ammonium salt as a charge-control agent for electrostatic toner contained in a dry developer composition. The dry, particulate, electrostatic toner composition of the present invention comprisesPP(a) a polymeric binder andPP(b) a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.