Patent ID: 6287739
Filing Date: 2001-09-11
Classification: G03G

Abstract:
A toner comprising toner particles and an external additive, wherein;said toner particles have a weight-average particle diameter of from 4 .mu.m to 9 .mu.m; andsaid external additive has (i) first, small-particle-diameter hydrophobic fine silica particles (A) having a BET specific surface area of from 100 m.sup.2 /g to 350 m.sup.2 /g, having been treated with a silane, (ii) second, large-particle-diameter hydrophobic fine silica particles (B) having a BET specific surface area of from 15 m.sup.2 /g to 80 m.sup.2 /g, having been treated with a silicone oil, and (iii) fine alumina particles (C) having a BET specific surface area of from 50 m.sup.2 /g to 150 m.sup.2 /g.