Patent ID: 8512931
Filing Date: 2013-08-20
Classification: G03G,Y10T

Abstract:
1. A process for printing or marking a substrate comprising the steps of: providing a toner by mixing at least a binder resin and a colorant to form a mixture; melting, kneading, and milling said mixture to obtain a melted kneaded product; and pulverizing said melted kneaded product; said toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95 and up to 0,985, wherein the total content of surface additives comprised in or on said toner particles is between 0.5% and 2% per weight of said toner particles, and wherein at least 80% wt of the total amount of surface additives remains on the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner particles is applied; and using said toner in a dual roll dual component development system with at least two oppositely rotating magnetic rollers to print or mark a substrate, wherein said toner is mixed with magnetic carrier particles thereby providing a two component developer, said magnetic carrier particles have a size from 15 to 60 microns; and wherein said toner particles are developable at a speed of at least 90 mm/s and up to 1000 mm/s.