Patents Assigned to International Toner Specialties
  • Encapsulated particulate magnetic development powders containing a sublimable dyestuff
    Patent number: 4536462
    Abstract: A novel magnetic, electrophotographic, development or toner powder is provided comprising essentially spherical particles with a diameter between 5 and 50.mu.. The particles contain small ferromagnetic particles, highly conducting carbon, at least 5% sublimable dyestuff and at least 4% of a surface active agent. The particles are preferably structured to have an inside nucleus zone containing dyestuff and surfactant and an outside shell zone which contains the magnetic material and the highly conducting carbon.
    Type: Grant
    Filed: November 22, 1983
    Date of Patent: August 20, 1985
    Assignee: International Toner Specialties
    Inventor: Wolfgang Mehl