Image forming method utilizing toner having inorganic particles

Details Image forming method utilizing toner having inorganic particles Image forming method utilizing toner having inorganic particles

1997-02-20

1999-06-22

Royer, William J.

Electrophotography

Image formation

Combined or plural functions by single component

399252, 430109, 430111, G03G 1530

Patent

active

059151501

ABSTRACT:
An electrophotographic image forming method according to (I) a so-called simultaneous development and cleaning scheme or cleaner-less scheme is effectively operated by using a specific non-magnetic toner. (II) The non-magnetic toner comprises non-magnetic toner particles having a shape factor SF-1 of 120-160, a shape factor SF-2 of 115-140 and a weight-average particle size of 4-9 .mu.m. (III) The non-magnetic toner further includes inorganic fine particles (a) having a number-average primary particle size of at most 50 nm and spherical fine particles (b) having a number-average primary particle size of 50-1000 nm and a surface area-based sphericity .psi. of 0.91-1.00, respectively externally added to the non-magnetic toner particles.

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