Toner for developing electrostatic image, apparatus unit and ima

Details Toner for developing electrostatic image, apparatus unit and ima Toner for developing electrostatic image, apparatus unit and ima

1996-12-31

1998-01-27

Martin, Roland

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430111, 430125, G03G 9097, G03G 1322

Patent

active

057120730

ABSTRACT:
A toner for developing electrostatic images is constituted as a powdery mixture of toner particles, inorganic fine powder, resin fine particles, and metal oxide particles. The toner has a weight-average particle size of 4-12 .mu.m and contains at most 30% by number of particles having a particle size of at most 3.17 .mu.m. The inorganic fine powder has an average primary particle size of 1-50 nm. The resin fine particles have an average particle size of 0.1-2 .mu.m and a shape factor SF1 of at least 100 and below 150. The metal oxide particles have an average particle size of 0.3-3 .mu.m and a shape factor SF1 of 150-250. The toner is effective for preventing toner sticking onto and ununiform abrasion of the electrostatic image-bearing member to allow the formation of high-quality images for a long life.

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patent: 5424810 (1995-06-01), Tomiyama et al.
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2-059768.

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