Highly classified oxidized developer material

Details Highly classified oxidized developer material Highly classified oxidized developer material

1974-07-18

1976-02-17

Weinblatt, Mayer

Compositions

Electrolytes for electrical devices

75 5R, 148 315, 209 71, 427216, 427221, G03G 910

Patent

active

039390861

ABSTRACT:
An electrostatographic developer mixture comprising finely-divided toner particles electrostatically adhering to the surface of highly shape-classified low carbon hypereutectoid steel carrier particles, the steel carrier particles comprising carrier cores having a composition comprising about 95.0 to 99.0 parts iron, 0.1 to 2.0 parts carbon, 0.5 to 2.0 parts manganese, 0.5 to 2.0 parts silicon, 0.03 to 0.1 parts aluminum, 0.01 to 0.05 parts phosphorus, and 0.02 to 0.05 parts sulphur, said carrier cores having been heat treated to a tempered martensitic microstructure with an average hardness of 40-55 Rockwell C and then overcoated with a coating material capable of electrostatically releasing toner particles adhered thereto to an electrostatic latent image. Processes of employing said developer mixture in electrostatographic imaging systems are also disclosed.

REFERENCES:
patent: 2618551 (1952-11-01), Walkup
patent: 2638416 (1953-05-01), Walkup et al.
patent: 3093039 (1963-06-01), Khinfrank

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