Patent ID: 6077635
Filing Date: 2000-06-20
Classification: G03G

Abstract:
A toner comprising toner particles and an external additive;said toner having;(a) in circularity distribution of particles measured with a flow type particle image analyzer, an average circularity of from 0.920 to 0.995, containing particles with a circularity of less than 0.950 in an amount of from 2% by number to 40% by number; and(b) a weight-average particle diameter of from 2.0 .mu.m to 9.0 .mu.m as measured by Coulter method; andsaid external additive having, on the toner particles, at least (i) an inorganic fine powder (A) present in the state of primary particles or secondary particles and having an average particle length of from 10 m.mu.m to 400 m.mu.m and a shape factor SF-1 of from 100 to 130 and (ii) a non-spherical inorganic fine powder (B) formed by coalescence of a plurality of particles and having a shape factor SF-1 of greater than 150.